2 0 1 1 S U M M A R Y
2011.137: Fri 30th Dec
Clive North, Jeff Price, Stuart Lindsay, Tim Large, Tony Audsley
We had a rather late start (1130) and I think that we all felt rather slow and heavy for some reason. Eventually, we got started and spent the rest of the morning in a deep and meaningful dialogue with the rock walls at the bottom of the drop ...
... In the afternoon, Jeff and Stuart went down to muck out the debris and they sent up six kibbles of spoil. There was little else of note except that Tim had a disagreement with my petrol stove and created a spectacular fireball about one metre in diameter. This set fire to the safety notice attached to the petrol pipe of the stove, completely blackened the kettle and filled the shelter with floating soots. Petrol stoves have real entertainment value, better than these mamby-pamby gas abominations, which just sit there and hiss.
2011.136: Tue 27 th Dec (1100 - 1700)
Alice Audsley, Annie Audsley, Jeff Price, Mike Wilson, Roger Galloway, Stuart Lindsay, Tony Audsley
Digga the dog
First thing, Annie and Roger went down the shaft and produced a line survey of the dig. Then Annie, Roger and Mike ran a 70mm (ish) I.D flexible pipe from the surface to the end of the dig and Tony fixed a VERY old Hoover "Dustette" vacuum cleaner at the surface end of the pipe. All junctions made sound and secure using short lengths of rainwater downpipe inserted inside the pipes and a liberal plastering of gaffer tape on the outside.
This done, we softened up the constriction at the bottom of the drop, turned on the ventilation system and sat round the shaft drinking hot Gluhwein for half an hour or so.
Annie, Jeff, Roger and Stuart then went underground and sent up 12 Kibbles of muck, lowering the floor by some 3 ft, (or a metre if you prefer that sort of thing). Unfortunately, the way on down is still closed by broken rock and the walls of the drop need more enlargement before we can dig it out effectively. However, the good news is that my Sunday-Best crow bar, last seen on 23rd November has been recovered.
COMPUTER PROBLEM - AAAAARGH !
2011.135: Sat 17th Dec (1045-1600)
Alice Audsley, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
We started at the Belfry where Stuart, Tim and I loaded sheets of wriggly tin into the van. We then drove in convoy to the dairy unit at Wigmore where we spent some time discussing the best way to get the wriggly tin and other bulky items over to the dig. We thought that the field was still sufficiently frozen to allow Tim to drive to the dig towing the wriggly tin sheets behind his truck. This was not entirely a good idea. It got the heavy items over to the dig, but it did plough up the field rather badly and we had been trying to avoid this.
Over at the dig, we met up with Mike and later Alice, who arrived with an emergency supply of screws. Mike got up on the roof of the new shelter and laid down two layers of heavy duty polythene sheeting. He then fixed the sheets of tin on top.
Stuart had found a couple of sheets of perspex, so he cut a slot in the west wall and fitted on the perspex as a window. This done, we installed a table in the shelter and immediately set up the stove on top and started boiling the kettle for some tea. Meanwhile Stuart cut another slot in the south wall for a second window.
2011.134: Sun 11th Dec (1100-1740)
Jeff Price, Stuart Lindsay, Tim Large, Tony Audsley
The original plan for today had been to start work on the winter digging shelter and then later to do a bit of rock removal at the end of RDR. However, things didn't go quite according to plan.
First thing, Jeff and I fitted a new fuel tap to Stuart's generator to replace the one that had suddenly sheared off. This done we had power for the circular saw.
With this out of the way we started work on building the shelter against the south wall of the digging hut / engine house. It was a rather rough and ready construction with 8 × 4 sheets of ply bolted and screwed to 90 mm square timber uprights at the corners. Tim did most of the fixing and the rest of us did most of the holding, which is the difficult part.
As the work progressed, the weather deteriorated and the wind increased. We realised that the structure would need to be complete, roof and all before it would be safe to leave it. So we abandoned the idea of working underground, which was probably just as well as during the afternoon, the skies opened in an incredible downpour, the depression quickly became flooded and an impressive roar of falling water could be heard at the top of the shaft.
At some stage during the late afternoon, I fell off the foundation wall for the new shelter and landed in an untidy heap on the water and rocks below. For me, this made the remainder of the day seem a bit more unpleasant than it actually was.
Eventually we fitted the roof sheets which made the structure secure enough to leave it for the time being, so we packed up and walked back across the sodden field.
Footnote, Mon 12th
2011.133: Sun 4th Dec (1030-1700)
Alice Audsley, Ian Gregory (Slug), Jeff Price, Mike Wilson, Stuart Lindsay, Tony Audsley
Vince Simmonds (visited in the afternoon)
A day of horrible weather and rather slow progress. Jeff and Stuart went down first and started clearing the rubble out of the drop, Jeff in the hole passing the stuff back to Stuart who bagged it. I followed them down a little later, then Jeff and I took turns in working in the drop.
We concentrated on chiselling the cracked up rock off the walls of the drop to enlarge it sufficiently to allow us to squat down and reach the material on the floor. This was slow work and rather tedious, but at least we had a better time of it than the team on the surface who were battered with strong cold winds and intermittent heavy showers of rain while dealing with the spoil.
In the afternoon Stuart had a few capping sessions to try to cut into the walls. He had somewhat mixed success with this as clay partings within the rock made it difficult to set the caps off.
By the end of the day, we had managed to produce a narrow shaft, almost 2 metres deep, still solidly choked at the bottom. We did, however, uncover a narrow slot (about 7cm wide) off to the side, which trends back under RD Rift and there is a slight hint of a cold draught.
2011.132: Sat 26th Nov (1045-1700)
Alice Audsley, Clive North, Dudley Herbert, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Stuart and I went and started work on clearing and enlarging the top of the drop. We had managed to block this entirely with rubble and it was great fun to clear it working head down and passing the stuff back to Stuart. After clearing most of the fines, I started lifting out the large blocks. Unfortunately as I was pulling on a key stone, it slipped from my hand and precipitated a collapse of most of the remaining debris down into the rift below. The way on is blocked AGAIN.
In the afternoon, Stuart and I cleared the stacked bags from Wed 23rd and today's spoil totalling 17 kibbles in total, largely broken rock. Stuart then started capping bits off the left wall of RD Rift to improve access and I dismantled the traverse abomination and sent it to the surface.
2011.130: Wed 23rd Nov (1430-1630)
Alice Audsley, Jeff Price, Tony Audsley
All three underground, clearing the remains of the rock that had overhung the drop. We bagged the broken rock and stacked the bags at the base of the shaft ready for Sunday's session.
The shaft/rift/way-on needs more widening before we can get down it. The best estimate puts it something in the region of 200 millibatstones.
Jeff did try knocking some of the nodules off the wall with my Sunday Best crow-bar but only succeeded in dropping it down the hole. I guess he owes me some beer for that.
P.S. There was a log entry number 129, but it was only about surface house-keeping and the like and was altogether too boring to inflict on anyone.
2011.128: Sat 19th Nov (1100-1645)
Alice Audsley, Chris Batstone, Ross Davidson (GSG), Stuart Lindsay, Tim Large, Tony Audsley
Roger Marsh (visited in the afternoon}
The weekend of the JRat digging award combined with the celebration of the 75th anniversary of the Mendip Rescue Organization.
This year the digging award was won by a Scottish team for their work at a cave near Applecross, Ross-shire known variously as Flood Resurgence No 2, FRN2, or now more properly as Uamh Nam Fior Iongantais (the cave of true wonders).
A small contingent of the GSG had travelled south to attend the award and we had managed to inveigle one of them, Ross Davidson into spending a day at the dig. Stuart, Ross and I met up at the Belfry and loaded some 8 × 4 sheets of ply into Stuart's van. More material for building our winter shelter.
At the dig, we were joined by the rest of the team and Ross and I went down and installed the wire traverse. This done, we were joined by Stuart; then Ross and Stuart started digging at the rear of the chamber while I started drilling into the obstructive rock at the head of the drop with the intention of eventually removing it.
It very soon emerged that the traverse system was A.F.U. (a technical term indicating that it didn't work very well) and it was abandoned in favour of passing the bags of spoil by hand. Nine kibbles of semi-liquid goo were sent to the surface where they were fielded by Chris on the winch, Alice on the bank and Tim as barrow-man.
The day's digging ended with the team sitting round a gently smoking shaft while drinking tea and eating stollen cake.
2011.127: Wed 16th Nov (about half a day)
Digging from home! Making up a traverse wire and Blondin to move bags of spoil from the back of the chamber up to the base of the shaft. This is just a temporary measure, but it is likely to be less fraught than manhandling the kibble in and out of the chamber using the power winch. Tried that once, didn't like it. The traverse head was made up from two lengths of 40 × 2 mm strip encasing two 50mm diameter cast iron pulley wheels. These are smaller than I would have wished but that's what was available.
My thanks to Dave Speed for his help with this.
2011.126: Sat 12th November (1100-1700)
Alice Audsley, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Tim and I went underground, where most of the morning was taken up by inserting a pair of metal grids, which happened to be more or less the correct size to act as shoring to retain the semi-mobile slope of fill in the chamber. There is a steeply sloping rock floor on either side of the chamber, but in the centre there is a metre(ish) wide trench which seems to be an open continuation of RD Rift. This trench is filled with fluid clay and small rubble which is trying to sludge its way down into the rift and undermine the base of the shaft at the same time.
The grids were stacked in place against the by now almost vertical slope of fill and held in place by eight 12 mm re-bar pins drilled into the rock walls of the trench. Four bits of psychological timber battening and a few wooden wedges were added and the whole topped off with a light sprinkling of cable ties. Unashamed bodgery, but it will do for the time being until we see how the area develops.
Meanwhile, Tim attacked the offending rock at the top of the drop in RD Rift. The result of much hammering, chiselling and levering was an exhausted Tim and a smugly unmoved block; you could almost see the smirk on its face.
Lunch was enhanced by a blackcurrent and apple pie, brought by Stuart.
In the afternoon, Tim and I descended once again into the mire and tried digging below the shoring by disconnecting the kibble from its guide cable and handling it down into the chamber. This, and in particular the return journey, was a slow and rather fraught process and not to be repeated without further thought and considerable modification. Despite this, we managed to send up five kibbles of mixed rock and sludge.
On the surface, Stuart continued building drystone spoil retaining walls in strange places, all the time grumbling bitterly about the lack of spoil and the slow rate of the digging.
Tea-time and Tim produced a Stollen cake. After tea, we dried off, cleared up and finished as dusk was falling.
An Aside: During the excavation of the fill in the trench, a curious rounded cobble turned up, which appears to be sandstone. The upper surface of the cobble is rounded, but the lower surface is almost perfectly flat (to within about 1mm); strictly speaking it is very slightly concave in the centre. It is very similar in shape to a tea-cake or bap. Further investigation is required.
2011.125: Thu 10th Nov (1200-1630)
Clive North, Tim Large, Tony Audsley
Tim and I went underground and attacked the loose rock on the walls of RD Rift from each end, Tim from the inside and me from the outside. After we had removed as much as possible, we started lowering the floor, excavating clay which graded into small stones as we got deeper. There were voids running down through the stony layer and on opening these, Tim was certain he detected a 'farmyard smell'. If he is right then that implies an open connection to the Wigmore streamway some 100 metres below.
One photograph shows Tim working in the rift at the start of the session. The second photograph shows the rift after we had cleared the loose material from the walls and lowered the floor somewhat.
I include the diagram above in the hope that it will make all this verbiage a little clearer. While it may be topologically correct, it should in no way be considered as a sketch survey, more an arrangement drawing. To give an idea of size, the shaft is roughly one metre between opposite faces (segments), from the east face of the shaft to the start of RDR is 3.3 metres and from the start of RDR to the drop in the cross rift a further 3 metres. The drop was plumbed at 3.5 ish metres (so much for our previous estimates), although to be fair, we couldn't get the tape right to the bottom of the hole.
2011.124: Sat 5 th Nov (1100-1730)
Alice Audsley, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
I went down to inspect the results of last week's efforts and to take some photographs. The floor at the rear of the chamber had been lowered considerably and solid rock had been exposed in the floor on the right. This could be the bottom of a bedding plane running under the rear wall of the chamber. There is a gap between this and the solid previously exposed on the left, filled with wet clay and Harptree Beds rubble. This needs shoring.
At the junction of RD Rift and the cross rift, the area had been cleared and it is now possible to squint down the drop there. This appears to be in the region of 7 metres deep, but it is difficult to be precise as it is narrow and twisted. Nevertheless, it does look like a good candidate for the 'way on', but there will have to be a lot of heated discussions with the surrounding rock before we can get down it.
Stuart then came down and started digging at the rear of the Annex chamber, while I acted as kibble filling monitor.
After lunch, Stuart and Tim went down and continued the excavation at the rear of the chamber. This is now very squalid because of the heavy drip in the chamber but voids are opening in the floor and this should allow some drainage during the week.
Campbell's Dig, Assynt, Scotland: Sat 29th Oct 2011
Alice Audsley, Annie Audsley, John Crae, Mark Brown, Norman Flux, Preston White, Roger Galloway, Tony Audsley
Alice and I had a bit of a diversion to the far north to attend the Grampian Speleological Group's annual dinner and we then did a tiny bit of digging with the GSG on their home territory. I mention it here because of the interesting winch used at the dig. This is a product of the devious and cunning mind of Norman Flux. The winch works on a counterbalance principle. It has two drums which, (like the breasts of the young girl from Devizes †), are of two different sizes. In one neat stroke this balances both the differences in weight and distances travelled of the bucket and the human counterbalance. In use, the bucket is filled, a caver climbs to the top of the ladder, clips on and then slides gracefully down the ladder. The caver goes down and the bucket comes up. Simple.
2011.123: Sat 29th Oct (1100 - 1800)
Chris Batstone, Duncan Butler, Jeff Price, Mike Wilson, Stuart Lindsay, Tim Large
NOTE: What follows is compiled from Tim & Stuart's reports.
Stuart went down first and started clearing, then he was joined by Duncan. The intention was to get Duncan beyond the squeeze, but this was still blocked with broken rock so they spent about 2½ hours clearing the approach while Tim worked at the bottom of the shaft transferring loads to the kibble to be dealt with by Chris, Mike and Jeff on the surface.
At the start of the afternoon shift, Duncan managed to get to the other side of the squeeze. He was fed a hammer, chisel and a supply of bags and left to get on with it. Meanwhile, Stuart and Tim worked on clearing more fill from the approach passage and the base of the shaft.
The air quality was variable. At the end of the morning session, with three people working at the bottom, the chamber and rift were filled with condensation haze, but during the mid-day break this cleared, so perhaps the draught is still with us, although it is not very obvious.
The way on is down in the floor at the junction with the cross rift, where the fill has slumped. This is too tight to get into at the moment and choked with boulders, but with black inviting spaces in between.
2011.122: Sat 22nd Oct (1045 - 1800)
Alice Audsley, Jeff Price, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 6
Alice, Stuart and I were first to arrive, and I went down to take a couple of quick photographs of the rift before work started in earnest. The photograph shows the rift and the top of the way on as the more or less circular darker patch rear centre right (marked 'X' on the enlarged image). Having got that out of the way, Stuart and I then sat in the Annex chamber and discussed the various options for today. We came to the conclusion that it would be sensible, if not a little boring, to complete the concreting of the shaft (south-east segment No. 6D) and concrete another section of the left-hand wall of the Annex chamber, which was about to slump if given half a chance. It had THAT look about it.
I came up the shaft, and found that Mike had arrived, so he took over the winch, Alice worked the bank and I barrowed and tipped. Five loads of previously filled bags were cleared out of the chamber and sent to the surface. One more load came out from behind the shuttering line of segment 6D in the shaft. Then followed a period of measuring, sawing, hacking and scratching of heads to produce shuttering for the new section of concrete in the Annex. Having got something more or less the right shape, we called a halt, Alice set up the BBQ, the depression filled with smoke and we had sausages, burgers, crisps and the like. More filling than our usual mid-day fare.
After the BBQ, Jeff and I went down, drilled holes into whatever solid was available then tangled together some 12mm re-bar, cut and bent to shape by the surface team. Viewed from below, bundles of re-bar being lowered down a concrete shaft can be both musical and worrying, a sort of cross between wind-chimes and swords of Damocles. It didn't pay to look too closely at the knots used to tie the bundles.
The shuttering was set up about a hand's width proud of the line of the previous two sections. This allowed the void to be filled easily and it will form a shelf when it has set on which can be placed small china ornaments, mugs of tea and such like. The shuttering itself was made from a couple of pieces of ply (and the inevitable polystyrene).
I have this theory that the various bits of shuttering will be held together firmly by the pressure of the concrete; so far, this has proved to be the case. The shuttering was held in place on the right by 10mm re-bar pins drilled into the rock and on the left by not very much but it didn't move. When the shuttering was full to the top, we added a psychological Acrow prop braced against the opposite wall, 'cos it looked good, but apart from possibly giving the impression that we knew what we about, it didn't add much in the way of support. Best part of all this was consuming a mug of tea and a HUGE slice of sticky toffee cake (courtesy of Tim), which Jeff had carried down the shaft.
The section under the Annex wall took four mixer loads to complete and we were getting short of concrete, so Mike drove off to get another bag. Meanwhile, I started on filling the last shaft segment of the fourth shaft ring (ring D). This took a further two loads, except for one kibble's worth. This remaining amount was bagged into three sausages and I stuffed these above the sleepers in the roof of the Annex to support the boulders above. There was a rip in the last bag and quite a lot of the contents went down the neck of my oversuit as the bag was being pushed into the hole, but some of it stayed up there. (Note: It's quite difficult to get concrete out of Velcro and a nylon zip once it has set.)
We packed up and had finished just after 6pm. A long and completely exhausting day for all concerned, but very enjoyable.
Afterthought - forgot to mention this earlier. We have decided to define an accessibility index to apply to any passages found at Home Close. The new SI unit of accessibility is to be 'The Batstone'. Thus RD Rift was originally something like a 300 millibatstone passage, possibly even less. After a bit of work it is now approaching 500 to 600 millibatstones, so there is some more work to do here. We are hoping that the unit will be adopted generally for the description of cave passages. It has much to recommend it. (Apologies to Chris).
2011.121: Fri 21st Oct
Clive North, Jeff Price, Tim Large, Tony Audsley
A slightly short session, 1030-1600. Tim and I went underground and started lowering the floor at the back of the Annex chamber, exposing more of the bedding plane at the back of the chamber and also the block of rock in the floor. Material from this excavation was stacked round the chamber if in bags or at the bottom of the shaft if rock. It soon got to the stage that there was no space left to stack. Some would have to be sent up to the surface.
I went up, started the winch and had hauled up 4 kibbles when Jeff turned up. Jeff went down to look at the bottom then he and Tim sent up another 5 kibbles, largely of rock, Mudstone and Harptree Beds. At this point (1330) it was lunch-time so Jeff and Tim came up.
After lunch Clive came over and drank tea while I went down and spent some time enlarging the tight section at the end of the rift. I emerged from the rift puffing and blowing like a leaky old steam engine, much to the amusement of the others.
2011.120: Sun 16th Oct
Alice Audsley, Stuart Lindsay, Tony Audsley
An afternoon session 1430-1745. Stuart went down and excavated in the Annex chamber, bagging spoil then stacking the bags under the concreted left-hand wall to prevent collapse. The back wall appears to undercut and further excavation revealed a large block in the floor. This appears to be dolomitic conglomerate and may well be bedrock as it rings very nicely when struck.
At the same time, I worked at the bottom of the shaft, managed to remove the stuck side cheek from the east segment (7D) and then installed the shuttering for the south-east segment 6D. I then dug out the floor of the bottom of the shaft, bagged to spoil and dropped the bags on top of Stuart in the Annex.
On the surface, Alice periodically dropped digging bags down the shaft when requested; often onto our heads; that bit wasn't requested.
We came out after about two hours underground and then spent some time on the surface talking to Simon, who had come over on a tour of inspection. We noticed with a certain amount of disapproval that Simon did not bring any cake.
2011.119: Sat 15th Oct
Chris Batstone, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 2
The plan had been to concrete the two remaining segments of level D in the shaft. These were numbers 8 and 6 on the north-east and south-east of the shaft. However, events ruled the day and we did not manage to do this, also curiosity got the better of us.
The session started with Stuart going below and lowering the floor of the Annex to improved access to RD Rift in preparation for another dose of concrete support for the left-hand wall of the Annex. Meanwhile, on the surface, Tim moved the timber heap from the west of the site leaving that area free for the new, huge spoil heap that is likely to appear soon.
Chris turned up with heaps of jam donuts for all. After these had vanished and the inevitable tea drunk, I went down and started removing the shuttering from seg 7 (east) with the intention of setting up shuttering for 8 and 6 on either side of this. This is where the course of the day changed. The right-hand side cheek was firmly jammed in position and it was not going to be possible to get it out in time to finish the planned work today. So, we concentrated on the north-east segment and left the other for another day.
Meanwhile, Tim had another go at RDR. At the expense of a considerably bruised sternum, he passed the constriction about 8ft (2.4m) into RDR and ended up in a cross rift about 12ft (4ish metres) from the entrance. Here he was able stand up, but all other movement was impossible. The way on appeared to be down in the floor. He was pretty well stuck in there so I fed him hammer and chisels and left him to chip his way out while I continued working on the shuttering. The whole of this extension is small and both it and the RDR approach will need enlarging before it can be dug effectively. But it is likely to be the best way on and there IS a (slight) draught.
Eventually, Tim managed to dig his way out, then went on up (grinning horribly). Then the usual round of concreting started. Chris, Stuart and Tim mixed and lowered and I trowelled and tamped. One and two thirds mixer loads went into the segment, leaving one cement kibble unused. Stuart had the idea of bagging this into five small sausage bags and I inserted these into the void above and to the left (south) of the sleeper supports in the roof of the Annex in an attempt to support the crumbling spoil behind. (The photograph shows the concreting kibble and the just completed segment 8 to the left).
SO, we only did half the concreting we intended, BUT we doubled our length of open passage AND we had chocolate cake for tea! Can't grumble at that.
2011.118: Tue 11th Oct
Jeff Price, Rich Witcombe, Tim Large, Tony Audsley
Mixer Loads: 2
Tim started by modifying his tarpaulin support framework on the north side of the shaft. He ran two horizontal scaff bars out from the headframe and supported them with two verticals. The shaft gate now clears this framework. Tim refitted the tarpaulin.
Meanwhile, Tony went below and dismantled the ply shuttering in the Annex. This revealed that the concrete had not been well tamped and it did rather resemble Russian mass concrete. The metal shuttering was then removed from the adjacent segment 5D, which had been cast at the same time. This also was not the best we have ever done.
The shuttering for 7D (east level 4) was then set up. A small amount of clearing was necessary before the side cheeks could be fitted. Tony then came up to find that Jeff had arrived some time before and that it was time for lunch.
Afterwards, Rich arrived, in answer to my earlier telephoned plea for help. (It really needs three on the surface to do all the carrying and mixing). The three of them then went underground to inspect RD Rift. Tim forced his way in again and is convinced:-
That was enough excitement for one day, so Jeff, Rich and Tim came back to the surface to start up the mixer and I (Tony) went down and fitted the re-bar, then made myself comfortable on a pile of digging bags in preparation for an afternoon's concreting. Two loads were used altogether. The first mix was a trifle too sloppy - Tim said that the water they used had been too wet, so that probably explains it.
We finished, cleaned and packed up by about 1630.
2011.117: Sat 8th Oct (1030 - 1700)
Chris Batstone, Mike Wilson, Stuart Lindsay, Tim Large, Clive North, Tony Audsley
NOTE: Today was the 34th BEC Vintagers' Annual Luncheon held at Coxley Vineyard, 12 noon onwards. So while I feasted, the rest of the team got on with some hard digging unhindered by my usual delaying tactics. I left the celebrations rather early at 1600 hrs, getting to the dig at 1700.
The team had enjoyed a fantastic digging session, Stuart and Tim underground sending up 21 kibbles of spoil to Chris and Mike on the surface. Some of the spoil had come from under shaft segment 7C (east), in preparation for concreting 7D below, bringing it to the same level as 1D (north) and 5D (south). This will leave 6D (south-west) and 8D (north-west) still to do to complete the fourth section of concrete.
Their major effort, however, was within the Annex chamber, where the floor was lowered towards the rear (west) of the chamber, sloping down steeply from the entrance and the base of the concreted left-hand wall. Stuart and Tim uncovered much more of the left hand rift and Tim was able to worm his way feet-first into this for almost two body lengths. The rift continues but it needs further clearing and, ideally, the floor of the Annex chamber needs lowering some more to improve access.
Tim suggested the name 'Rough Diamond Rift' partly because Tony Jarratt described cavers as 'rough diamonds' and partly because of abrasive nature of the walls of the rift. A hastily convened meeting of the sub-committee on passage names approved his suggestion. It will, however be referred to as RD Rift or RDR from now on in these pages to avoid confusion for those who use Google to look for references to gemstones.
On the surface, a new spoil heap was started on the west side of the dig and Stuart started building a retaining wall for the heap out of the large amount of rock that had come out of the dig during the day. Tim extended his rude shelter round the shaft with more wriggly tin on the south side and a tarpaulin supported on scaffold poles on the north side. He also installed a weathervane on top of the headframe.
Tony and Clive turned up at 1700 hrs, then Tony had a token squirm into the passage, got slightly stuck, came out again and then spent a short time discussing important matters of philosophy and morality with a large boulder in the Annex chamber, finally managing to bore it to bits.
We packed up and left the site at 1830.
2011.116: Sun 2nd Oct
Alice Audsley, Chris Batstone, Chris Harvey (Zot), Stuart Lindsay, Nick Gymer, Tony Audsley
Mixer Loads: 5
1030 hrs; Stuart and Tony surveyed the wreckage of humanity at the Belfry and managed to persuaded Chris Batstone, overhung and suffering from a painful knee, and Nick Gymer, suffering from a badly gashed right hand to come over to the dig.
On the theory that we probably had enough working limbs between us, we decided to go ahead. As a bonus, a fully functional Zot turned up out of the blue. Alice was due to arrive at midday with refreshments, so we were well away.
The intention was to shutter segment 5D (four levels down on the south side of the shaft), and extend this to run into the Annex to support the left hand wall, where all the bag stuffing had been going on yesterday.
Segment 5D was to be shuttered using the 'conventional' steel shuttering, but attached to the right hand side of this was to be wooden shuttering for the left-hand wall of the Annex. This required a considerable degree of bodgery both for the shuttering and the reinforcing.
To start with, Tony went down and fitted the steel shutter in position. It was then obvious that the floor needed lowering some more and so he was joined by Stuart and together they filled 12 kibbles of spoil, which were hauled out variously by Zot and Chris. This included the material stacked under the Annex wall on Saturday. After this, Stuart went up and left Tony to play on his own.
[I am not altogether sure of the details about the surface work from this point on, but from the sounds filtering down the shaft it seemed to consist largely of boiling the kettle then drinking tea. But I may be wrong.]
Underground, two 18mm holes were drilled in the back wall of the Annex to take 4 ft lengths of 16mm re-bar. These were then attached to 12 mm re-bars bent at 112 (ish) degrees which were hooked at the end. These were to join the Annex wall concrete to segment 5D. A cat's cradle of more horizontal and vertical 12 mm re-bars was made inside segment 5D which looked like it might do some good. Four 12 mm holes were drilled in the back wall of the Annex close to the line of the ply shuttering and the back end of the ply was secured by 10mm re-bar pins and wooden wedges, the gaps being sealed with scraps of polystyrene (wonderful stuff).
The shaft end of the ply shuttering was abutted against the steel work and sealed, as ever, with a thin strip of polystyrene. It was held in position by re-bar and wedges jammed down from above, a G-clamp onto the steel work (which later fell off) and I am not quite sure what else, possibly luck, but whatever it was, it didn't move.
Then started a mammoth concrete mixing session. A letter-box slot had been cut in the ply shuttering, but in practice a large proportion of the concrete was fed in via the shuttering for 5D and pushed along to the back of the void with a 4ft length of 25mm plastic water pipe. As the shuttering filled, it had to be fed from both ends, which was quite (actually very) tedious in practice.
The highlight of the day as far as I was concerned was, late in the afternoon, receiving a bucket of concrete with a mug of tea embedded in the top. This was most appreciated. Altogether, five loads were mixed, lowered, trowelled and tamped. This was a long day and finished at about 1900 hrs in the evening to a wonderful mackerel sky in the west.
This account could have done with a few pictures, but I didn't take any - too busy doing stuff.
Note added 7th October: During the afternoon, a hot-air balloon flew over some distance to the east of the dig. We didn't know it at the time but the passengers were Mike Hearne and his family on a birthday trip. Mike photographed the dig on his mobile phone (at 18:47) and he has just sent me the result. So, we did get a photograph after all. Behind the dig can be seen Chris' Volvo and Stuart's van; my Land Rover is parked to the left of the dig but apparently invisible as befits its ex-military status.
2011.115: Sat 1st Oct
Alice Audsley, John Williams (Tangent), Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
It was the day of the B.E.C. [Bristol Exploration Club] Annual General Meeting. Fortunately, this finished in time to allow those of us who were not going to the dinner to have an afternoon session at the dig, starting at about 1500 hrs. In the event, this turned into quite a major session, with Stuart Lindsay and Tangent digging at the bottom and the rest of us providing surface support.
Fifteen kibble loads were sent up, with a high proportion of rock in the spoil. The area at the back of the Annex chamber was lowered by a couple of feet producing about a 45° slope down to the rifts. The rift on the right continues down getting slightly wider, but the bottom portion is solidly choked with mud. However, the upper section continues open for some 10-12 feet. The rift on the left looks more interesting, the entrance is almost caveable and it slopes away downwards into blackness. Two large boulders need removing before it can be approached more closely.
In the late afternoon, Tony went down, admired the rifts, but exclaimed mild horror about the way in which the concrete of the left-hand wall of the chamber had been undermined and so spent quite some time stuffing bags and rocks back into the void to support the fill dangling above.
This fill obviously needed concrete support ASAP, but we had potential labour problems on Sunday; Mike and Tim were not available and Alice was only free in the afternoon. On top of this, Saturday evening was BEC annual dinner, so there was some considerable doubt that we would be able to get together a sober enough team for Sunday to do the concreting. If this were to be the case, then the next digging opportunity was a week away and the fill would have to be supported until then; hence the bag stuffing.
We finished and packed up at 1830 hrs.
2011.114: Wed 28th Sep
Alice Audsley, Tony Audsley
A short visit in the afternoon for Alice to inspect the great works at the bottom of the shaft and for Tony to replace the leaking fuel tap on the winch petrol tank with another, (almost as old but a different design), which hopefully won't leak QUITE so much as the old one.
Watered the sunflowers.
2011.113: Sat 24th Sep
Alice Audsley, Stuart Lindsay, Tim Large, Tony Audsley
During the week the plan to concrete in the roof boulders was changed to one of drilling the right-hand wall to take 22mm pins and using these to support scaffold poles with sections of railway sleeper on top. So as before, we arrived at the dig loaded up to the eyeballs with dig-fix-it kit.
After Tony had taken a few photographs of the annex chamber before work started, Tim and Stuart went below and after removing the timber shuttering from the left-hand wall of the chamber, they began clearing the floor. Then started a hauling session in which 16 kibbles of rock and sludge were taken to the surface. A large mudstone boulder was successfully capped by Stuart and reduced to manageable fragments.
During this morning and mid-day session, Tim and Stuart unearthed two rift like passages low down at the rear of the chamber. These appear quite small but both look like they will get bigger with increasing depth. The one on the left drops about a metre and then appears to head west, the right-hand one trends north-west. It is not impossible that these will merge into one as we dig lower.
The floor of the chamber needs lowering considerably before we can get a better look at these passages, but we need to fix the roof before we start on this so the afternoon session involved Tony fitting 22mm re-bar pins into the right-hand wall and then fixing scaffold bars between these pins and the top of the concrete shoring wall on the left of the chamber. The surface team then sawed a couple of lengths of railway sleeper which were then fitted on top of the scaffs to support the worrying boulder hanging above the the entrance.
The sleeper timbers also support the less worrying but more dangerous blackened boulder hidden behind and above. This was more dangerous because it was more likely to fall, having already slipped, and it held back a lot of 'stuff' above. However, it was less worrying because it was quite difficult to get a good look at it unless you went in to the chamber lying on your back, in which case you got a very good look at it, but that was not the sort of thing that you did more than once. It did raise a bit of prickling at the back of the neck while drilling the wall underneath it but that could have been due to over-active imagination.
The photograph on the left is taken looking into the 'annex chamber' before removing the boulders on the right and excavating the floor.
The photograph on the right shows a closer look at the boulder floor
(Click on either to enlarge).
8432: Detail of the small rifts at the rear of the chamber. the triangular hole on the left descends for about a metre then appears to head west. The rift on the right is open for a couple of metres and heads north west.
8430: Detail of the rift on the right; it is small but beautiful none the less.
8440: Scaff bars and one section of sleeper supporting the entrance boulder (and the stuff behind). OK, the sleeper is upside down but it was hammered into position before I realised this and it doesn't now want to come out. A second length of sleeper has since been fitted to the left.
2011.112: Sat 17th Sep
Alice Audsley, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 2
This was a fantastic day's digging, although frequent and very heavy showers of rain made life a bit difficult on the surface. Tim's rude shelter certainly proved its worth.
We had decided to try to fix the entrance to the rift extension before it all collapsed, so we arrived on site with the whole paraphernalia of the complete cave fix-it kit including:- generator, saws, angle grinders, scaff clips, Hilti drill, 240v SDS drill, crowbars, a sheet of plywood and other items too numerous to mention.
Tim and Stuart went down the shaft in an attempt to expose the left hand wall more completely and at the same time avoid a collapse of the stuff lurking above their heads. They sent up 10 kibbles of spoil, largely rock and cleared the extension down more or less to the level of the base of the shaft. The extension was roughly semi-circular in plan and lacked the expected rift like feature thought to exist buried under the fill on the left. Some rocks fell from above during the excavation but they missed the diggers. Some also fell later while we were on the surface eating our lunch.
After lunch, Tim and Tony measured up for some plywood shuttering to support the fill at the left of the entrance. Tim then went aloft to cut the shuttering board while Tony remained below to drill 20mm holes in the back wall to take re-bars to reinforce the concrete and some 12mm holes for pins to support the shuttering ply. The cut ply was lowered down the shaft, fitted into position and held in place with a combination of short lengths of 10mm re-bar drilled into the rock, wooden wedges and blocks of polystyrene foam, a truly awesome combination of materials.
With the shuttering held firmly in position, two mixer loads were sufficient to fill the void behind. The next stage is to concrete from the top of this new wall across to the right hand wall and seal off the rocks above. Oh Joy!
The plan below shows the nature of the extension and the shuttering for the unstable part of the left-hand wall. There are a couple of sizeable blocks in the floor, to the right is a narrow trench in the fill and some degree of undercutting to the right-hand wall can be seen.
Rough plan of the extension.
2011.111: Fri 16th Sep
Tim Large, Tony Audsley
An afternoon session (1400 - 1700), initially with the intention of removing the shuttering from segment 1D. Tony went below and unbolted this, while Tim worked on extending (upwards) and generally strengthening his wriggly tin shelter. Tim also fitted tarpaulins to the north and south sides of the shaft to help keep out the rain.
Tim then went below and probed the rift on the left and DISCOVERED THE LEFT HAND WALL. So we do have a left hand wall and it is within reach and so we can dig the site as planned. All we need to do now is to sort out the crap directly above. There is a largish black boulder towards the back of the rift and this has shifted position since last week. It would be good if we could keep it more or less in position as it is holding quite a lot of stuff up.
Tony then went below and drilled three 20mm holes in the wall under the black boulder and then inserted metre long bars to try to dissuade it from moving further down.
What a great afternoon.
In case you missed it the first time,
WE NOW HAVE A LEFT HAND WALL !!
2011.110: Sat 10th Sep
Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 2
Tim and Tony arrived somewhat earlier than the others and came to the conclusion that we were in for a fun day as the rain, although not very heavy was coming at us sideways from the south-west. Tim set about constructing a Tim Large Patent Weather Shield, (in other words a Rude Shelter) which was (a) effective and (b) made the site look like a proper Mendip dig by moderating the air of creeping neatness that it had been acquiring recently. The shelter needs a little bit of modification but it did work very well and was much appreciated.
With the arrival of Stuart and Mike we started digging. Stuart was persuaded to go underground, possibly because he did not realise just how squalid the bottom of the shaft had become. He dug a trench across the west side of the shaft, preparing for the excavation of segments 1D and 5D (ie on the north and south of the shaft. Eleven kibble loads later, he had lowered the floor against the west wall and excavated the hole for segment 1D.
By now it was lunch time so Stuart came up and then prostrated himself by the shaft in a vain effort to persuade the rest of us that he had been working hard.
After lunch Tony went below and Mike, Stuart and Tim mixed two loads of concrete which were duly fed into the shuttering and TAMPED.
A very satisfactory day's work.
2011.109: Fri 9th Sep
Tim Large, Tony Audsley
Les Oxborough visited
Firstly, Tim unbolted and dismantled the two sets of shuttering from segments 8C and 6C. Then we had a look into the extension rift and a joint ponder on what to do about it.
Whatever way we looked at it, the left wall seemed really quite horrible with no solid visible. So, having pulled a few of the bags out that had been stacked in there on 27th June, we thought that it would be a good idea to have a bit of a hauling session to clear out the bottom of the shaft.
Tim stayed below and did the digging and Tony worked (slowly) on the surface tasks. We eventually managed to haul 11 kibble loads. Les turned up mid afternoon to check up on us.
Examination of the rift reveals that the left hand wall is boulders and mud. However, one of the boulders looks large enough to be useful if we can hold it in position. Looking straight up into the roof of the rift reveals quite large blocks with voids between them. Not nice but with any luck it will stay put for a while. The right hand wall is showing signs of undercutting at its base.
So, we need to get a couple of feet lower to get an idea of what is going on with the wall.
2011.107: Sun 4th Sep
Jake Baynes, Stuart Lindsey, Tony Audsley
Stuart and Jake delivered six 8 × 4 ft sheets of ply to the dig to be used for constructing a lean-to weather shelter against the side of the digging hut. Stuart and Jake did all the heaving getting the sheets into the depression and Tony stacked them against the back wall of the hut and then wrapped them in polythene sheeting to protect them from the weather.
5-SEP: The photograph was taken today during a quick visit to finish off the wrapping of the ply-wood (T.A.)
2011.106: Sat 3rd Sep
Chris Harvey (Zot), Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 4
A long day, (1000-1730); the first time we have tried to complete two segments in a day. Tony went down first and removed the most of the shuttering from segment 7C. All that is except the right side cheek, which defied removal for quite a long time. All the iron work was eventually sent to the surface and then Stuart went down and excavated segments 8C and 6C, ie either side of the segment concreted on Monday. He finished by lunch time having sent up 10 kibbles of spoil.
After lunch Tony went down and set up the shuttering and then followed an uneventful but rather lengthy concreting session. The surface team were adamant that they only sent down three mixer loads worth of concrete. The underground team (me) thought it was more; but then one of the buckets did land rather heavily on my head and jumbled the mechanism within, so I'm probably in no position to argue.
So three it is.
4-SEP - The surface team have recanted - it WAS four mixer loads after all!
2011.105: Mon 29th Aug
Alice Audsley, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 2.5
Tim went below and sent up all the bags that had been stacked at the base of the shaft on Saturday. He then dug out for segment 7C, sending up 12 kibble loads in all. Meanwhile on the surface, Mike was the engineman, Alice was banksperson, Stuart wheel-barrowed, stacked, built retaining walls and Tony faffed.
We broke for lunch, then Tony went below and assembled the shuttering, while the surface team measured and bent re-bar which was carefully lowered then fitted into the slots in the shuttering. Then started the usual round of hauling aggregate, mixing, barrowing, lowering then trowelling into the void and then poddling it. There is probably a correct technical term (†) for vibrating concrete to remove voids but I don't know it, so poddling it has to be. (It's done with a poddling stick).
Two and a half mixer loads were used to fill the void and Stuart used the rest to hold his wall together.
We left at about 1600 hours after a very satisfactory day's digging.
2011.104: Sat 27th Aug
Alice Audsley, Jeff Price, Stuart Lindsay, Tony Audsley
(Entry number 104 isn't a mistake, I left a tedious engineery log entry out - I enjoyed doing it but it doesn't make a good read).
Alice and Tony arrived early and started clearing at the bottom of the shaft. Finding that it was possible to work the hauling system (slowly) with just the two of us, we eventually hoisted 7 kibble loads to the surface.
Jeff then arrived, having been delayed by problems in Bristol which meant also that he also would have to leave early. Because of this, we decided that it would not be possible to do any concreting this afternoon.
Segments 6, 7 and 8 still require excavating and concreting and the plan had been to do the central segment (No. 7) first and then do both 6 and 8 next weekend. So, to move things on as far as possible, Tony excavated the fill in front of 6, 7 and 8, bagged it and stacked the bags back into the space just created.
Plan A being thwarted, we devised a new wonder plan B. This is to have another session on Monday, when we can quickly whip out the stacked bags and throw in a great dollop of concrete and live happily ever after - well that's the plan anyway.
2011.000: Sat 20th Aug, Sun 21st Aug
Alice Audsley, Tony Audsley
Alice and Tony travelled deep into the dark realms far to the east of Frome to see an exhibition of the work of MacDonald Gill, a much underrated artist, designer and architect (d. 1947). Realising that this was not a sufficient excuse for missing digging, we managed to bring back a (hopefully restorable) Honda cement mixer engine. Will try to fix this on Monday. It's always good to have a spare. [Didn't quite fix it on Monday - need to get new gaskets, etc.]
2011.102: Sat 13th Aug
Alice Audsley, Bill Combley (Wormster), Dudley Herbert, Mike Wilson, Tony Audsley
Mixer loads: 2.5
A dry day on the surface but very wet underground. To start with Tony went below and set up the shoring ready for working on segment 5C. i.e. directly opposite 1C or the other side of the rift feature. As the surface was dry and (almost sunny) and underground was wet and 'orrible, no-one else showed a great desire to go underground, so Tony stayed below and sent up 13 kibbles of spoil.
There was then a break for lunch, after which Dudley went below and dug and bagged two loads of spoil. He said it made his soul feel better, which is always a good thing to do.
After that Tony hogged the fun again and went below to set up the shoring for 5C. This was not altogether easy as the fill was very wet, in the mood to misbehave and eager to collapse. So the excavation had to be conducted as rapidly as possible.
Initially, the spoil was bagged and the bags were stacked round the base of the shaft. As the need for haste increased, the spoil was thrown over the digger's shoulder and plastered against the back wall of the shaft.
Eventually, the segment was cleared out, the shuttering was finished and the reinforcing installed. Panic over and we settled down into the well-worn routine of mixing, lowering, trowelling and tamping. Two and a half loads were mixed and most of this was used underground. The remainder was spread round the base of the digging hut to discourage small furry creatures from tunneling in.
Six and a half hours. A tiring day for all concerned. We could have done more because there are something like another 10 loads of spoil to be removed from the bottom of the shaft. But enough is enough. All credit to Bill who did a lot of the surface heavy work despite having broken his collar bone recently in Swildons. (Although it served him right for going to such an awful place).
2011.101: Fri 12th Aug
Alice Audsley, Tony Audsley
Quick afternoon visit to fix the new half section of ladder to the bottom of the existing ladder and to remove the shuttering from segment 1C. Both tasks accomplished despite Mendip mist and squalid, wet conditions at the bottom of the shaft. The shaft shelter fitted in July provided a welcome degree of protection on the surface.
2011.100: Tue 9th Aug
A pleasant afternoon spent finishing off a short, 5 ft (or 1.524 metres if you must) length of ladder. It seemed a good idea to use 12mm rebar for the rungs because the dig had some to spare and it was FREE. However 12 mm rebar doesn't fit into half inch holes, not even when they are drilled out to 13mm. But if you hammer something hard enough, eventually it will go in, so that's OK. Having persuaded all the rungs to fit in a bit of weld was splashed on to make sure they stayed in.
2011.099: Mon, 8th Aug
Alice Audsley, Dudley Herbert, Mike Wilson, Tony Audsley
Mixer loads: 3
Tony went below to have a final clear-out of segment 1C and sent up 4 loads of mud and small stones. Alice acted as banksperson, Mike as engineman and Dudley took the part of spoil-heap monitor. A thoroughly good time was had by all.
We had a break for lunch and a natter in the sunshine, then Tony went below again, fitted the right-hand side cheek to the frame then installed various bits of rebar cunningly cut and bent by the surface team.
During the afternoon, Alice, Dudley and Mike shovelled, carried, mixed and lowered and Tony sat down below and trowelled the concrete into the shuttering. A slow, steady and uneventful afternoon's work.
Next weekend - same again
2001.098: Sun, 7th Aug
Start of a ladder making session to produce a 5 ft intermediate section of fixed ladder. When I made the last batch of ladder in October 2008, I had prepared a ten foot length of the flat steel strip to act as a jig for making future sections. This was drilled with small holes at the correct centres for the the rungs and the fixing bolts.
All that was necessary this time was to find the jig (ha-ha!) then to pop through it with a small diameter punch to mark out a new strip. Having marked the centres, the strip was then drilled with ¼ inch pilot holes. At this point rain stopped play, it's a start, anyway.
I won't apologise for the 'old fashioned' imperial units. The steel stockist that I use supplies 40 × 8mm strip in 20ft lengths, even though the invoice calls it 6.1 metres. These I cut in half to give 120 inch lengths of steel strip which divide nicely with 12 rungs spaced at 10 inch intervals. 10 inch rung spacing is a comfortable step size and was traditional for Mendip ladders anyway.
2011.097: Fri, 5th Aug
Alice Audsley, Dudley Herbert, Jeff Price, Mike Wilson, Paul Brock, Tony Audsley
Excavation for segment 1C. The plan was to lower the floor in front of segment 1B and then excavate under 1B to reach the wall behind (to the north). Paul, Tony and Jeff took turns underground. Fortunately, Paul did most of the hard work. Dudley Herbert came over for a look-see then ended up emptying bags on the spoilheap. For some strange reason he seemed to enjoy this.
We, (or rather Paul), got the floor lowered satisfactorily, with a decent pit in front of 1C, then we started excavating under the concrete to get to the rock wall behind. We had expected to expose solid rock a short distance in at the back of the excavation, but found instead that the wall seems to have receded to the north, away from the line of the shaft. So it was not practicable to pin 1C into the rock as we had intended. This was a bit of a problem as I had prepared a special set of shuttering based on the assumption that the concrete would be pinned to the wall behind. However, the cave makes the rules, so who are we to argue with it?
So with our best laid plans having ganged ever-so-slightly a-gley, we uttered a string of magic words, put in some temporary shoring and packed up for the day, with the intention of having a bit of a think and then returning revitalised to do the shuttering and concreting on Monday.
2011.095: Sun, 31st Jul
Alice Audsley, Tony Audsley
Alice and Tony paid a brief visit in the afternoon to take some photographs.
Photograph 8259 shows the shuttering in place on segment 7B. It also reveals evidence that the mix we were using was a bit on the wet side. It's not all like that, but I squirted some water in to dampen down a rather dry mix and overdid it just a bit.
Photograph 8261 shows more or less the whole shuttering frame, the two upright members held in place by a cross member bolted to the segment above. An old bit of wetsuit can be (just) be seen helping to tension the left hand upright. The modified 'letter box' shutter allows the lower segment (7B) to be filled to the top.
Photograph 8262 shows the so-called 'way on'. It's blocked for now and is a useful place to store tools and stuff. The two drain-water pipes have been poked into the bottom of the rift, so with any luck it is digging itself while we carry on with the cementing.
Photograph 8266 is looking straight down the shaft. The shuttering frame is holding up segment 7B (East). Segment One (North) is at the bottom of the photograph with the spade leaning against it. (The blurry blue thing in the bottom right hand corner is my leg).
2011.094: Sat, 30th Jul
Alice Audsley, Jeff Price, Mike Wilson, Tony Audsley
Mixer loads: 2.05
First thing, Alice and Tony finished off the work on the shelter by fixing down the cladding with good old MVF21434 - SCREW, ROOF & WASHER 14G x 32 TO WOOD, (that's what Mole Valley Farmers call them and they should know, they sell them.
Tony then went down below and removed the shuttering from 6B and set it up on 7B, the last segment on this ring. Meanwhile, Jeff and Mike arrived, so Jeff then took over and cleared the base of the shaft and dug out segment 7B, sending up 5 kibble loads with Mike as Engine Man.
We had a quick break for consumption of hot dogs, then Jeff had to leave, so Mike and Alice started bending three lengths of rebar as required. Unfortunately, the jig slipped when Mike was bending a bar, trapping his finger between the jig and a scaffold tube. This resulted in a string of 'they words' and a very painful looking bluish purple finger, possibly due to lose its nail.
Despite this, Mike and Alice carried, mixed, poured and lowered concrete while Tony sat at the bottom trowelling and ramming the stuff. Using the new 'letter-box' technique the segment was filled right to the top with two mixer loads of concrete.
To be strictly truthful, two mixer loads did not completely fill the segment, so the surface duo personfully mixed about half a bucketful by hand and that was exactly the right amount.
Good session. Even Mike thought so, despite his throbbing finger.
2011.093: Fri, 29th Jul
Jeff Price, Tony Audsley
As we drove over to the dig, we saw a buzzard perched on the headframe eyeing up a pheasant on the ground below. The buzzard flew off and the pheasant waddled away to live for another day.
Having frightened all the wildlife away, we continued working on the scaffolding for the shelter. It's much easier with two. We laid two planks over the scaffolding framework and then laid cladding taken from an old up-and-over garage door on top of the planks. These planks were fixed to the scaffolding using 'U' bolts bent out of good old 8mm studding.
We ran out of time before we could secure the metal cladding to the planking. We just popped some timber on top to stop it all blowing away before tomorrow morning, when we'll fix it properly.
2011.092: Tue, 26th Jul
Set up a rough scaffolding framework by the shaft with the intention that it should form the support for a shelter over the shaft working area. This is an attempt to produce a better environment for the surface workers, which is probably more than they deserve. The attempt may be doomed to failure anyway as the rain tends to arrive more or less horizontally. We shall see.
2011.091: Sat 23rd Jul
Alice Audsley, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 3
Tim and Stuart arrived before the rest of us and they started work on building a spoil-heap retaining wall to the south of the engine house/digging hut. (When we have built up a sufficiently high platform of spoil behind this wall, we'll build a lean-to against the engine house to act as a wet-weather shelter for the surface workers). Stuart then had to leave to meet up with Trevor Hughes and work on another from their vast portfolio of digging sites.
Tony then went below and drilled a series of 45 degree holes in the bottom of segment 6A, then chiselled out a wedge of concrete. This was to create a space so that the segment below could be completely filled with concrete. This would eliminate the need for pointing in the gap afterwards. He then set up the shuttering frame for segment 6B. There was an overwhelming lack of enthusiasm on the part of the others when offered the chance to leave the sunshine and get into the slime and do some digging, so Tony stayed below and sent up 5 kibble loads of spoil.
Mike spent some time furdling with the mixer engine and got it to run rather more sweetly than it did last week. Unfortunately Mike then had to leave after the first mixer load, but Tim and Alice made a valiant effort and kept the concrete flowing freely for the next two loads.
Having cut a channel in the base of the segment above, it was possible to fill 6B completely to the top using the new 'letter box' top shutter plate. Three mixer loads were required and we finished at 18:30.
2011.088: Sun 17th Jul
Dave King, Jeff Price, Tim Large, Tony Audsley, Alice Audsley
I am rather hesitant about writing this up as it was not a very successful day, but in the interests of truth, here goes.
Dave King (ATLAS and MNRC) came over clutching a doctor's note to excuse him from digging, which was not really necessary as very little actually got done. Dave did manage to get the sump drainage system working again after it had stopped for some reason. Tony went below and removed the shuttering from segment 8B and then retired to the digging hut in TORRENTIAL rain. There was a proposal that we should adjourn to Hunters' for a planning session and the motion was carried unanimously and enthusiastically.
Meanwhile, the rain abated and Alice, as prearranged, turned up at the dig, worked out where we would be and waited in vain for an hour for our return. Mobile phones are wonderful things, but they need to be turned on.
That's it. Must try harder next time.
2011.086: Mon, 11th Jul
Jeff Price, John Williams (Tangent), Tony Audsley
Jeff and Tony removed the shuttering from segment 5B, then Jeff fitted a short section of electron ladder at the bottom of the shaft to help aged diggers get out of the hole.
Tony then tried probing for the left-hand wall of 'The Way On' (TWO). Working at full stretch, managed to clear a small section that looked fairly promising. However, having drilled a couple of holes with the intention of inserting rebar supports, it turned out to be a large boulder.
Tangent came down and had a furdle into TWO. He was impressed by the open space and waxed lyrical about the right-hand wall, but was singularly unimpressed by the left.
At the moment, it does not seem possible to get at the solid left hand wall of TWO, assuming of course that it exists at all. We need to excavate one more level, install ring "C" and try again. Rather disappointing, it is going take longer than we had hoped, but we'll get there.
2011.085: Sun 10th Jul
Jeff Price, Chris Batstone, Tony Audsley
Mixer Loads: 5
Jeff started excavating for segment 8B and sent up 4 kibbles of spoil including some appreciable rocks. At the bottom of the excavation, clean voids and blackened rocks started to appear.
After a break for tea, Tony went down,sent up another kibble of spoil then set up the shuttering and reinforcing. After yet another tea break, Cecil B. de Batstone went down to test out his new lightweight video camera (we await results of this).
Finally Jeff and Chris, both suffering from the after effects of heavy colds, variously ferried aggregate, coughed, mixed, spluttered, ferried more aggregate, wheezed and lowered buckets of concrete to Tony who sat on a plank bench underground and leisurely troweled it into the void. They even sent down a cup of tea in one of the buckets of concrete; it was much appreciated.
Footnote on segment numbering: I have been referring to the octagonal segments of concrete quite happily by numbers without making much attempt to explain this so here is a belated explanation.
The segments are numbered ANTICLOCKWISE from #1 on the north side of the rift as shown in the following neatly crafted diagram:-
Segments have suffix A, B, ... where A refers to the topmost ring, B the next and so on.
Number 1 was the first segment cast because I thought it was the closest to the rock wall (it wasn't; 2, 3 and 4 were). The segments are numbered anticlockwise because there was a large boulder under 6 and 7 and I thought that it was supporting the shaft and ought only to be removed after the shaft had some other support (this turned out to be a mistake as well, but 20/20 hindsight is a wonderful thing; would that we were all born with it).
2011.084: Sat, 9th Jul
Alice Audsley, Jeff Price, Mike Wilson, Stuart Lindsay, Tony Audsley
Mixer Loads: 2
Driving over to the dig at 1000 in the morning saw a pair of hares disporting near the dig, which was a good start to the day.
Some time later, having sorted ourselves out, Stuart went down and started work on excavating section 5B, sending up 7 kibbles of spoil. After lunch, Tony went down and installed the shuttering and reinforcing, then made himself comfortable on a seat of planking and fed in concrete prepared by the surface team. Two mixer loads in total.
The bottom of the fixed ladder is now at head-height and it is getting difficult to reach it. Need to make some more.
2011.082: Thu, 7th Jul
Alice Audsley, Tony Audsley
Tony went down the shaft and removed the shuttering from position 1B. There is quite a void between 1B and its neighbour to the right (8B), so perhaps we ought to concrete 8B this Saturday. Took some of the shuttering steelwork back home for cleaning and as a pattern for drilling holes in the half-made second shutter frame.
2011.081: Sun, 3rd Jul
Took the old shutter/shield to the Belfry and spent a pleasant time cutting up a sheet of steel with an angle grinder. This effectively disturbed the slumbers of the festering Belfryites who were sunbathing on the lawn nearby.
2011.080: Sat 2nd Jul
Alice Audsley, Duncan Butler, Ian Gregory (Slug), Jeff Price, Les Oxborough, Stuart Lindsay, Tim Large, Tony Audsley
Mixer Loads: 4
Tim and Stuart started digging out under concrete segment #1. They bagged their spoil and stacked it in the riftlette as a temporary measure to prevent the left-hand wall collapsing. Having filled this they sent a few bags up to the surface.
I had hoped that the rock wall of the main rift would be trending to the south (ie into the main rift), but instead, if anything the main rift appears to be widening. The plan for this segment had been to angle the shoring towards the rock wall to produce a tapering concrete plug. But the wall did not agree with this plan so it had to be abandoned. By the rules of the game, the cave always has the last word.
Tony went underground, cleared out the void a little bit then installed the MkII version of the shuttering. This simply bolts to the concrete above and is altogether slimmer, simpler and more beautiful. Tony drilled the wall and inserted pins then created a rat's nest of reinforcing. The surface team then started a mammoth mixing and lowering session. Initially the mixer engine started to have tantrums for some reason best known to itself, but eventually it started to behave. Down below the concrete was poured and prodded and occasional holes between the shuttering and the rock were blocked off with bits of polystyrene (great stuff).
By the end of the day, an unknown number of bags had been stuffed into the way on, 8 Kibble loads had been hauled out and 4 loads of concrete poured into segment 1B ( '1' being the north most position and 'B' implying 1 level down). There remains a small void of two to three centimetres between the segments which still needs filling, but the existing concrete needs to harden somewhat before this can be done.
Tea, cakes and buns were enjoyed by all during the day, as befits such a civilised dig.
Lots of words, no pictures - too busy to take any - sorry.
2011.079: Fri 1st Jul
Quite a long day working at home (0900-1800). Continuing with mods to the old shuttering and making up a second 'light weight' set so that if necessary we can cope with two segments at a time. Nothing exciting just slow drudgery.
2011.078: Thu 30th Jun
Collected some rebar and took it to the dig then collected some angle iron from the dig and took it home.
Spent the rest of the day working on modifications to the shuttering so that we can use it for concreting the next ring and the entrance to the riftlette.
Still a bit more to do.
2011.077: Wed 29th Jun
Alice Audsley, Tony Audsley
A quick morning trip to take some photographs and collect the shuttering frame for refurbishment, fettling and generally fiddling with.
2011.076: Mon 27th Jun
Mike Wilson, Tony Audsley
A quick morning visit for Mike to attend to the petrol leaks on the winch and to try to fix the rather erratic slow-running.
Meanwhile, Tony dredged the bottom of the "wishing well" sump and lowered the level of the blue drainage pipes, then fixed them in position.
Later we both went below and examined the left wall of the riftlette then had a think.
Unfortunately, probing with a bar revealed that the solid rock left-hand wall is too far away for us to get away with pretend shoring. It needs serious attention to the entrance area and the roof, so we will have to lower the main shaft floor and deal with it from a lower level. We can bag the spoil and stack it in the riftlette for the time being to support the left-hand side.
Remembering Golden Rule No. 1; "A solid roof means happy diggers"; it's back to the concreting we go.
Oh well, the digging was fun while it lasted, but open passage is always the ruination of a good dig, so it's good to have a valid excuse to fill it back in.
2011.075: Sun 26th Jun
Alice Audsley, Chris Batstone, Ian Gregory (Slug), Jeff Price, Mike Wilson, Stuart Lindsay, Tim Large, Tony Audsley
Babs Williams, Liz Jeanmaire, Mike Wheadon
What a lot of people. What a fantastic day. What a great digging session. Pity about the horse-flies; but one can't have everything.
We dug a trench in the floor of the west side of the shaft going down about a metre and a half, exposing a solid rock wall (dol cong) on the west side of the excavation and we got better access to the continuation of the rift. The digging conditions in the trench could best be described as slightly squalid. This was partly due to Jeff's love affair with the in-shaft washing system, but also because there was a very heavy drip in the entrance to the rift extension.
So what's all the fuss about the rift extension? Well, it is important because it is where we are going to have to dig. It will be easier to shore this rift than the full width of the main rift directly below the concrete shaft. So it's good to have it but there is still a long way to go yet.
So what do we have? First the good news; a solid right hand wall of dolomitic conglomerate, beautifully sculpted and a joy to behold. Now the not-so-good news, the left hand wall is a tottering pile of grot and this will need disciplining PDQ before it decides to collapse. However, the space between these walls is pure delight. It has a degree of openness, the area has obviously taken water over a long period and the fill is largely blackened, angular rock.
Jeff was posted into the hole and wormed his way further in to look down the drop at the end. This was choked about a couple of metres down with clean washed rocks. Getting Jeff back out of the hole was really quite difficult, but as he would have taken quite a long time to rot down if left in there - out he had to come.
By the end of the day, we had removed 16 Kibbles of spoil, had a lot of fun and dug ourselves into a state where we urgently need some more concrete. So it goes on.
2011.000: Sat 18th Jun
A valid excuse for missing a weekend's digging. An excellent dinner attended by 92 Grampian members, which included some Mendip Folk, viz:- Alice Audsley, Anita McNab, Angie Glanvill, John Williams (Tangent), Kirsty Mills, Martin Mills (Milch), Pete Glanvill, Pete McNab (Snab), Tony Audsley. Good food, good company, good singing & good dancing; all helped down with a modest quantity of "Great Northern Brain Wrecker".
Any beer with a cave bear's skull on the label has to be worth drinking.
There were five of us staying with Annie and Roger in Uphall and so we seven shared a taxi to and from the dinner. The taxi ride back from the dinner was enlivened by our driver having to swerve violently to avoid a head-on with another driver travelling rather fast the wrong way along our lane of the dual carriageway.
FOOTNOTE: Unfortunately, the inevitable happened and soon afterwards there was a head-on collision which killed the drivers of both vehicles. There were no passengers in either one. (Report in Edinburgh Evening News, 20th June 2011).
2011.073: Tue 14th Jun
Jeff Price, Tony Audsley
A pleasant afternoon and also the first session of genuine digging!!!! Jeff went on down and started digging a hole in virgin spoil at the side of the shaft nearest the rock wall and the "exciting rift". Three kibble-loads later he had a respectable hole and had created a void under the concrete foundation.
There is an open rift, floored with blackened stones. The left wall visible in photograph (3) is a Mudstone boulder and the right wall is solid dolomitic conglomerate. As the Mudstone boulder is pinned to the concrete with a couple of lengths of rebar, it will probably have to stay where it is and we will work down underneath it.
So far, it all looks very good.
2011.072: Wed 1st Jun
Jeff Price, Pete Rose, Tony Audsley, Tony Setterington, Trevor Knief
An afternoon trip for Jeff and Tony to remove the shuttering and tidy up at the bottom of the shaft and for the others to do a tour of inspection. At least, I guess that was what they intended, but they were pressed into hauling the steel-work and general debris out of the shaft.
2011.071: Tue 31st May
Alice Audsley, Tony Audsley
Quick visit in the afternoon to tidy up and take some photographs at the bottom of the shaft. The photograph on the left shows the three part steel shuttering held in position with wooden wedges, while on the right of this photograph there is a bodged plywood shutter held in position with a second prop. All gaps are stuffed with bits of polystyrene foam - where would we be without it?
The second photograph is taken from some 3 metres up the shaft and shows the three steel straps and bottle jacks, the cable guide (bottom right), the shutter frame supported by a ratshit winch, the blue drainage pipes and the yellow hose pipe for washing the rock walls before concreting. All very homely.
2011.070: Sun 29th May
Alice Audsley, Chris Batstone, Jeff Price, John Williams (Tangent), Stuart Lindsay, Tony Audsley
Mixer Loads: 6
The space remaining for the last two sectors was, in fact, equivalent to about 1.5 sector's worth, so we decided to do them both at the same time. This also made it easier to place the digging shield to avoid the third shaft strap and bottle jack. So, the shield was positioned slightly to the right, leaving a small space to its left and a rather larger space to its right.
CB went down and went twelve rounds with the boulder before finally beating it into submission. He then sent out 5 (very) full kibbles of stone and mud.
After a break for lunch, TA went down and fitted the shuttering. The space to the left of the shield was plugged with a strip of polystyrene and the space to the right with a cunningly crafted sheet of ply-wood, which was held in position by a second acrow prop. These two crossed props necessitated a rather contorted working posture for the rest of the procedure.
TA fitted the reinforcing, then started filling the void with concrete,supplied by the surface team, who variously shovelled, drank coffee, mixed, poured, drank tea, carried and lowered the full buckets of concrete over and over again, until the sixth mixer load finally completed the job.
Half way through the process, Tangent climbed down the ladder with a cup of coffee, which was gratefully received at the bottom.
Now the underpinning is completed, the next stage is to move out and have a look at the narrow continuation of the main rift.
2011.069: Sat 28th May
Alice Audsley, Clive North, Tony Audsley
A quick afternoon trip (1600 - 1800 hrs) to crack up a large boulder that was seriously in the way and preventing installation of the last section of concrete.
2011.066: Sun 22nd May
Alice Audsley, Chris Batstone, Duncan Butler, Ian Gregory (Slug), Jeff Price, Tony Audsley
Mixer Loads: 4.5
Quite a hard day, digging and concreting, partly because there were several large rocks that had to be removed from behind the shoring line and they patently were quite happy to stay where they were. Eventually they gave up, but we had to resort to drilling and splitting.
By the end of the day, the sixth segment of concreting was completed - two more to go.
An aside: For some time I have been pondering about probabilities. In particular, what is the probability of a kibble of cross sectional area "a" falling randomly down a shaft of cross sectional area "b" inpinging upon a person of cross sectional area "c". I thought that this was quite a fascinating area of study in an abstract sort of way.
This afternoon, the winch driver, (†), introduced a practical element into this abstract heaven by accidently stalling the winch with a loaded kibble half way up the shaft and then releasing the brake and dropping the kibble to the bottom. Fortunately, the cable guide removed some of the randomness, but it was an interesting experience never the less. There is not a lot of room to spare at the bottom.
(†) The identity of the winch driver is the subject of an injunction and therefore has been redacted and must remain secret. We can only refer to him as as "CB".
2011.067: Thu 19th May
Alice Audsley, Ian Gregory (Slug), Jeff Price, Stuart Lindsay, Tony Audsley
A pleasant couple of hours in the afternoon sun (1600 - 1800). The bottom of the shaft was cleared and flattened ready for a digging / concreting session on Sunday next. The "band of bedrock" found last Saturday (14th) was probed and found to be an isolated large boulder, so it can be tenderized and removed.
We finished the session with tea and biscuits while we sat on the wall round the shaft - very civilised.
2011.064: Tue 17th May
Jeff Price, Les Oxborough, Tony Audsley
Les finished his work on the hut and tidied up the site. Jeff and Tony went down the shaft and removed the shuttering. We had intended to take out a couple of loads of spoil, but the rain was coming straight down the shaft, so we wimped off instead.
2011.063: Sun 15th May
Alice Audsley, Chris Batstone, Clive North, Ian Gregory (Slug), Stuart Lindsay, Tony Audsley
Mixer Loads: 4
A full day session digging and concreting sector 7. In this sector, the fill was heavy clay and stones and relatively straightforward to work with, although the presence of large rocks to the right did occasionally cause problems. 10mm rebar was fitted and hooked to the rebar hooks protruding from sector 8 on the left. Roving reporter Batstone collected some video pixels at the bottom of the shaft, recording all this activity for your delectation - or something like that.
There were periodic brew-ups of tea and coffee on the surface. I guess we are beginning to settle into a workable routine.
2011.062: Sat 14th May
Alice Audsley, Ian Gregory (Slug), Les Oxborough, Mike Wilson, Stuart Lindsey, Tim Large, Tony Audsley
A long afternoon session where things did not go entirely to plan. The idea had been to remove the shuttering from position 3 and move it one place to the left, into position 4, and excavate in preparation for a concreting session tomorrow. Unfortunately, a few centimetres down, a band of what looked very like bedrock appeared and rather spoiled this idea.
On closer examination, the rock turned out not to be dolomitic conglomerate and this suggested that it was not bedrock. but just a very large block. We need to excavate more round it to be sure of this.
Bedrock or not, is effectively prevented any attempt at excavation and concreting at position 4, so Plan B came into operation. Plan B was to move the shutter to the opposite side of the shaft (position 7) and start work there. By 6pm, the shutter was in position and an offending bit of boulder to the right had been hammered into submission, so we should be OK for tomorrow.
Altogether 11 loads were hauled out. There was a problem with the winch, when a particularly heavy load caused the drive clutch to slip. Mike, Tim and Stuart carried out technical field repairs using hammers and scaffold poles. Surprisingly, they didn't break anything and they did fix the winch.
2011.060: Sat 7th May
Alice Audsley, Ian Gregory (Slug), Jeff Price, Les Oxborough, Mike Wilson, Tony Audsley
Mixer Loads: 3
Yet another heroic session ! The shuttering was removed relatively easily from the last position and moved one place to the left into position number three. Only a relatively small amount of material was removed from the bottom of the shaft, but it was mainly rock and it revealed voids through blackened, iron-stained boulders the like of which I, for one, had not seen for a long time.
Directly behind the shutter was a rift-like feature with a Dolomitic Conglomerate wall on the right (northern) side and a Mercia Mudstone wall, or possibly a VERY large boulder on the left-hand side. The floor of this rift-like feature was loose, blackened, clean-washed rocks which emitted a cool draught.
All this was far too exciting and full of promise, so we stuffed sacking into the floor and rear of the cleft, then filled the remaining space with three mixer loads of concrete, flavoured with a hint of steel reinforcing - delicious. That should give us a good solid roof to work under when we start tunneling into the rift at a slightly lower level.
PS: Actually, the real highlight of the day was Alice turning up at mid-day with heaps of pork pies and crisps - wonderful.
(Should have taken some exciting photographs of all this, but too busy digging and eating pies - sorry).
2011.059: Sun 1st May
Duncan Butler, Ian Gregory (Slug), Jeff Price, Nick Winter, Tony Audsley
A quick 'After Hunters' visit to do a little bit of tidying up. Jeff and Duncan took turns in grinding off the annoying lip that Tony had left inside the digging bucket when he had cut out the top section. The lip had an almost magical ability to retain spoil and bags and had caused much annoyance. Ian, Nick and Tony filled the water containers by syphoning water from the nearby drinking trough.
2011.059: Sat 30th Apr
Alice Audsley, Chris Batstone, Chris Harvey (Zot), Ian Gregory (Slug), Jeff Price, Mike Wilson, Tim Large, Tony Audsley
Mixer Loads: 3
Another good day. (Mike Wilson produced fairy cakes to keep us going at mid-day). We cleared out the fill for the next section then drilled into the solid and fixed four rebar pins to help key the concrete plug to the rock.
Having washed the rock clean with the inbuilt watering system - (the rock ended up clean, but everything else was messed up) - the concrete plug was cast using most of three mixer loads of concrete. The remainder was used to help stabilise the ground round the door of the digging hut.
The draught was tested with a small candle and it blew the flame out.
The day's events were recorded by roving reporter Batstone on his video camera.
2011.058: Fri 29th Apr
Alice Audsley, Rosie Audsley, Tony Audsley
The family went over with the intention of hammering in the rebars to support the top of tomorrow's excavation. Bars went in on the right with little trouble, but bars hammered in on the left-hand side of the shutter all hit rock.
A small probe on the left revealed a solid block of dolomitic conglomerate, or at least a pretty good imitation thereof. The rock rang with a pure clear tone when struck with a lump hammer.
I must admit that I had forgotten quite how close the rock was on this face when we had placed the bottom ring in position in August 2008. However a search through the early photographs turned up one showing the shaft close to the solid on the western side. This is good news because there is less material to excavate and the concrete can be pinned to the solid with reinforcing drilled into the rock.
The left-hand photograph below shows the shaft in position in August 2008, with solid by the ladder (to the west). The other two show the solid as revealed nearly three years later, but as everything down here is uniformly red, it is difficult to distinguish solid from clag.
2011.057: Tue 26th Apr
Alice Audsley, Les Oxborough, Tony Audsley
Les continued working on the hut. Alice and Tony removed the steel shuttering and found that Trevor Hughes had done a good job with the concrete; a lovely smooth surface. We then set up the shutter in the next position (No. 2) ready for a digging session at the weekend.
2011.056: Sat 23rd Apr (1030 - 1800)
Alice Audsley, Clive North, Ian Gregory (Slug), Les Oxborough, Tony Audsley, Trevor Hughes
Mixer Loads: 5
An heroic St George's day at Home Close. Medals ought to be given to all concerned, or at the very least an issue of chocolate money.
In the morning, Alice and Tony refitted the carburettor and, after a bit of tweaking and adjustment, the winch engine seemed to run better than previously. Tony then went below and fitted the 'Miracle Digging Device' into position [Number eight in the grand plan]. This was secured with the Acrow prop and lengths of rebar were hammered in to support to fill above. Les turned up then and started work on the roof of his new hut.
In the afternoon, Slug, Trevor and Clive arrived, so Tony went below and burrowed under the rebar roof, sending 5 skip-loads (15 bags) to the surface. The shuttering was then slipped into position; a considerable amount of cursing was necessary to persuade all the bits to align properly. Trevor then went below and the rest variously ferried aggregate, measured out cement, mixed, lowered full buckets, raised empty buckets and were generally useful. Altogether five mixer loads were sent down the shaft.
All things considered a very satisfactory day's digging, about which Spokeshave the Bard could well have written:-
"And gentlemen in England now a-bed
2011.055: Thu 21st Apr
Went over to the dig briefly and removed the carburettor from the winch and took it back to Cheddar to fettle it and try to cure its tendency to flood.
2011.054: Tue 19th Apr
Alice Audsley, Les Oxborough, Tony Audsley
Alice and Tony removed the shuttering and then took some photographs while Les continued to work on hut two.
2011.053: Sun 17th Apr
Alice Audsley, Tony Audsley, Trevor Hughes
Mixer Loads: 1
In the morning, Tony worked at the Belfry and finished the modifications to the shutter.
In the afternoon, Alice, Tony and Trevor went over to the dig, then Trevor and Tony refitted the modified shutter at position 1. The new design of shutter should allow the concrete to be taken up to the level of the concrete ring. Trevor thought that it would work, so he remained at the bottom of the shaft on pouring and tamping duty while Alice and Tony worked the mixer and fed buckets of cement down the shaft. Removing the rebar supports for the fill cause a small collapse, which Trevor dug out and sent to the surface.
The next time we do this we will be able to pour the concrete in one session; this should save quite a lot of time.
2011.052: Sat 16th Apr
Jeff Price, Tony Audsley
Most of the day spent working at the Belfry on modifications to the shutter arising from experience of the first use of the device. These mods were mainly concerned with adding another leaf to the shutter so that the concrete could be taken up to the base of the ring above in one go, rather than pointing in a concrete block as originally planned. I guess that, as a general rule, Plan B is usually better than Plan A.
Should have completed these by Sunday morning. Should have ...
2011.051: Fri 15th Apr (am/pm)
Alice Audsley, Jeff Price, Les Oxborough, Tony Audsley
In the morning, Alice & Tony unbolted the side cheeks from the shutter frame and tried unsuccessfully to remove the left-hand side cheek using a ratchet puller.
In the afternoon, Jeff and Tony dismantled the framework and removed it leaving the side-cheeks in position. They then spent about an hour hammering, chiselling, levering and cursing, trying to remove the left-hand cheek. In the end, it was the cursing that did the trick.
The right-hand cheek was removed about two minutes later, I guess it might have been frightened by all the cursing.
Meanwhile, on the surface, Les continued working on the replacement site-hut / store.
2011.050: Wed 13th Apr (1430hrs - 1630hrs)
Alice Audsley, Tony Audsley
A bit of explanation about what is going on.
Unfortunately, last Saturday, too much stuff had been dug out from the right-hand side (north east) of the shutter and the fill there had been undermined. As this area may not get its dose of concrete for some time, we felt that it was necessary to put in some temporary support.
We had put three bags of excavated fill into the void on Saturday, but more was needed. So this time we filled bags on the surface and lowered them down the shaft. Oh Shame! Oh Ignominy! Are we just trying to delay the digging?
Be that as it may, the three extra bags were crammed under the concrete ring and held in position with vertical rebars hammered into the fill and supported at the top by clamps cunningly fixed to the bottom of the concrete ring.
The next step is to remove the rebars above the concrete and point in a concrete block to fill the gap between the top of the concrete and the bottom of the shaft ring. Then dismantle the shutter/ shield, move it and start again. And so it goes on...
2011.049: Mon 11th Apr (1000 hrs - 1630 hrs)
Alice Audsley, Les Oxborough, Rich Witcombe, Tony Audsley
Mixer Loads: 5
Quite a long day working in the Mendip mist and drizzle. Les concentrated on working on his hut project. Tony went down the shaft and spent quite a long time fitting the pre-prepared reinforcing into the shuttering. Then Alice and Rich mixed cement and lowered it down the shaft to Tony who fed it into the shuttering. When midday arrived, we had to eat our various lunches huddled in the hut sheltering from the drizzle. Thankfully, it brightened up a little by the time we had finished eating.
In the afternoon, Alice and Rich did another couple of mixer loads and sent them down the shaft to be fed into the shuttering. Altogether, five cement mixer loads were used to fill the formwork.
That's it for a few days, we will give the concrete time to cure before dismantling the shuttering.
2011.048: Sat 9th Apr
Alice Audsley, Chris Batstone, Dave Garman, Ian Gregory (Slug), Jeff Price, John Williams (Tangent), Les Oxborough, Phil Romford, Stuart Lindsay, Tony Audsley
It had to come at some stage, I suppose; we have actually started digging !
Chris Batstone, Dave Garman, Phil Romford and Tony Audsley all took turns in digging at the bottom of the shaft. The intention as to lower the fill on the north side of the shaft under the magic digging shield and then fit the side cheeks as formwork for the concrete.
We all found the work area extremely constricted as the Acrow support divided the 1.2 metre diameter shaft into two and the bucket took up more than its fair share of space on one side of this. Eventually, we settled on filling sacks, stacking them, then hauling them out in batches of three or four.
On the surface, Ian Gregory settled into the role (rôle) of Banksman, unhooking and traversing the skips, while most everyone had a go at driving the winch. The winch itself worked tolerably well, although it was irritatingly noisy and controlling the lowering of the skip required a degree of finesse, but this is improving as the brake shoe starts to bed-in.
Alice produced a BBQ at mid-day (HCH Time) and Chris Batstone provided the beer to wash it down.
At the end of the day the shutter was completed, so overall the day was a success. There were a few problems. Slug noticed that a hard pull from below on the signal bell wire would cause the left-hand shaft door to slam shut. He noticed this when he was kneeling down and looking down the shaft; the door fell on his head. A cable tie to divert the cable from the door should prevent future injuries. The winch carburettor needs some attention as it flooded a few times for no apparent reason. The steel shuttering did not assemble underground as easily as it had done on the surface and required hammering and magic words. Finally the dig telephone couldn't be heard when the winch was running, but that was expected and it is a bit of a white elephant anyway.
A good time was had by all, although Slug did suffer somewhat from the effect of strong sunshine on a hatless, bald & bruised head.
The era of 'The Pink Pillow-case' is well and truly with us again.
"All over Mendip, once spotless white pillowcases took on a pink hue ... "
2011.047: Thu 7th Apr
Les Oxborough, Tony Audsley
Les spent the afternoon working on the new hut again, while Tony made a temporary support to reinforce the rebar 'roof'.
2011.046: Wed 6th Apr
Alice Audsley, Les Oxborough, Rosie Audsley, Tony Audsley
Tula (the Jack Russell)
Les spent all day working on a new small site hut to replace the temporary shelter that had been built at the time of the RatFest (15 Nov 2008) and is beginning to fall apart.
Alice, Rosie & Tony started on what is hopefully the last of the 'final preparations' for digging. We installed the 'digging shield' at the bottom of the shaft, fixed it with an Acrow prop, then drilled and drove in as many 1 metre lengths of rebar as possible act as supports for the fill. Unfortunately several of these did not reach the rock wall, so we may need some extra temporary support during the excavation / cementing phase.
Space is now very limited at the bottom of the shaft, especially with a bucket at the bottom, digging should be fun.
(There is still a faint draught near the base of the ladder).
2011.045: Tue 5th Apr
Les spent the afternoon at the site, demolishing pallets so that the timber could be made into a small site hut.
2011.044: Mon 4th Apr
Ian Gregory (Slug), Les Oxborough, Tony Audsley
Three 'wise' men spent most of the day preparing for the spring offensive. Filling the water containers, clearing the centre of the site, sawing up plywood and completing wiring for the telephone and lights. Can't think of anything more but there probably was.
2011.043: Sun 3rd Apr
Chris Batstone, Tony Audsley
Took the modified shutter frame over to the dig, then we went down the shaft to inspect the draught. Chris produced a smoke testing pellet which he lit and filled the shaft with fume. The official verdict is that there is a slight but definite draught from the fill into the shaft. So, as it has been Verified by Batstone™, the draught is now an official one.
A very heavy thunderstorm reduced enthusiasm for any further work
2011.042: Sat 2nd Apr
Alice Audsley, Les Oxborough, Tony Audsley
Les continued working on the hyper drainage system and by late afternoon declared that it was finished.
Alice and Tony reinstalled the plumbing system in the shaft. This dates from ages ago and is for washing off a rock face before concreting. So, if we ever get to see the rock face again, it will come in useful.
Then cleared all the debris from the bottom of the shaft, old shuttering timber, bits of hose-pipe and lengths of rebar. Stacked all this in the digging skip and hauled it out using the power winch. This is being taken as the first bucket-load of the spring offensive.
Then lowered the shutter frame down and tried it for size and fit. It was almost OK, it just needs a few touches with an angle grinder and a spot of welding.
Most importantly, there was a distinct inward draught down through gaps in the fill by the base of the ladder. This was NOT the product of a fevered imagination (as was suggested at the time).
2011.040: Mon 28th Mar
Les Oxborough, Tony Audsley
A pleasant afternoon after Hunters. Les continued adding courses of brickwork to the sump, while Tony made up a cunning device out of a washing-up bowl, some plumbing fittings and a length of hose to get water from the broken cattle trough to the water barrel at the dig, where it is needed to slake the thirst of the concrete mixer.
2011.038: Sat 26th Mar
Les Oxborough, Tony Audsley
Called in at the Belfry in the morning and collected steel offcuts that had been left there by the offcut fairy. Then over to the dig and delivered the orange cement mixer. Then started on a series of trivial pursuits. Fixed the new i-Bucket Counter in the i-Hut, pulled the water pipe through the ducting that we had laid under the concrete shaft apron and built a foundation at the south-east corner of the hut to hold a water butt.
We used to rely on the drinking trough near the dig for water for cementing, but this sprang a leak during the winter and we need an alternative supply, hence the water butt.
Les came over after lunch and spent the afternoon cleaning up bricks to use on his sump improvement scheme. Tony spent the afternoon wire brushing reinforcing rods ready for the cementing underground. Also did a little bit of work on the bucket traverse system.
2011.034: Mon 21st Mar
In the morning, removed some bags of spoil from Caine Hill, then went over to the dig briefly and fixed a light up in the headframe. The wiring for this had been installed for some time, but the light had not been fixed.
Also fixed a runner on the cable guide to restrain the bucket at the shaft bottom and fixed the traverse chain system to allow the bucket to be swung away from the shaft and tipped into the wheel-barrow
The photograph shows details of the traverse chain and the (white) guide rope and pulley.
2011.033: Sun 20th Mar
Assembled the newly delivered jig&shutter device, and spent quite a lot of time measuring, then thinking (that was the slow bit) then measuring then thinking again, to work out the best arrangement for the reinforcing. Then clamped the i-J&S to the stile, which oft-times doubles as a stable work-bench and then, surprise, surprise, time to go to Hunters'.
Later on, measured up for the first set of reinforcing and bent the bars successfully using the i-Bender.
The rebar bender is just a length of angle iron with scaffold clamps welded on so that it can be attached to something rigid. The bar is bent round the fulcrum using a length of iron water pipe. Crude, but it works. And, yes I know that a bolt thread should protrude through a nylock nut, but I didn't have a longer bolt and I only had nylock nuts at the time. (Jeff has since then left a handful of assorted 12mm nuts in my pot at Hunters, thanks Jeff).
2011.032: Sat 19th Mar
Alice Audsley, Les Oxborough, Tony Audsley
Les continued to work on the i-Sump. (Everything else seems to be sprouting an i prefix, so why should we be any different?) It looks like we are entering the realm of the i-Dig, things can only get more silly.
Meanwhile Alice and Tony delivered the completed i-Jig&shutter to the dig, then worked on finalising the cable guide and bucket transfer arrangement as well as preparing some timber supports for the i-Jig/shutter device.
2011.025-031: Thu 10th - Thu 17th Mar
Les spent most of the week on and off on a solo civil engineering project to improve the sump drainage and to ensure that it will continue to work when (if?) the spoil-heap builds up around it.
2011.024: Thu 10th Mar
I think that this counts as the final faff, so it's worth recording.
Made up a bending jig for the 10mm reinforcing bar out of a metre of angle iron, three short studs - (one as the bending fulcrum and the other two as distance pieces). The contraption then had two halves of a scaffold clamp welded to it so that it could be secured when in use either to the stile or part of the headframe, whichever takes our fancy.
2011.023: Wed 9th Mar
At last, I think that the Acme combined jig and shutter is complete. The photograph shows the device lying on its back with left side cheek now having slots cut to allow reinforcing bars through it and the right-hand cheek. More importantly, the slots allow the side cheeks to be removed once the concrete has set. Glad we thought of that now rather than later.
The reinforcing poking out of the slot was just a piece that came to hand, and for illustration only; it will be bent rather differently when the device is used in anger. Which reminds me, the last outstanding job is to make a bending jig - maybe do that tomorrow. [I did - see above. (T.A.)]
Unkind folks might query why there were slots cut in the upper part of the side-cheek (LHS in photograph) and then filled in. When/if I can come up with a good excuse, I'll let you know.
2011.018: Sat 26th Feb - The Jig & Shutter - a belated explanation.
The photograph shows the support frame propped against the wall of our house. When it is in use and in the shaft, it won't be quite so easy to photograph it. The jig is held in position by an Acrow prop with its foot on the far wall of the shaft - or, in this photograph, the garage wall. The piece of timber shows the position of the bottom of the concrete shaft relative to the jig.
Why bother with all this? Well, we have a 10 metre concrete shaft which is sitting on mud and the fill around the bottom rings is wet and runny. When we have tried to tunnel below the bottom ring, the fill has collapsed very quickly. Repeated attempts to do this would have created a void around the bottom of the shaft which might well have endangered its structure and stability.
We needed a system that could be put into position quickly, that would hold the fill in position while we were excavating under the shaft wall and that would support formwork for a mass of concrete under the shaft.
The intention is to insert an "elephant's foot" structure under the shaft. This will be built in eight sections forming an octagonal foundation under the shaft. The "Jig & Shutter" (sounds a bit like the name of a pub) is designed to help accomplish this.
So how does it work? First of all the jig is fixed against the wall of the shaft with the Acrow. Then bars are hammered (or drilled) into the fill, just below the level of the concrete pipe, (see the drill in position at the bottom of the jig). These rods are partly supported by the fill and partly by cantileverage off the jig itself. Sufficient rods are inserted to support the fill above them during the excavation.
A hole is then dug in the fill below the jig some 460 ish mm wide and some 500 mm deep (more like 18 by 20 inches). When this has been done, angle irons slide down from inside the jig and two side pieces (cheeks) are then bolted to these. The whole structure is held in position by the jig frame, so setting this second part up does not take long. Once in position, the top and sides of the excavation are supported and it is possible to work through the front of the shutter to fix the reinforcing. When this is complete, the front panel can be fitted and wedged into position and concrete poured in. The second photograph shows the side cheeks and the front panel fitted to the jig. The side cheeks still have to have slots cut in them so that bits of rebar can stick of the sides to mate with the rebar in the neighbouring section.
The third photograph shows the (almost) completed unit as it would be fitted together in the shaft. The upper two horizontal bars are the support for the end of the Acrow prop, while drill rods and miscellaneous supporting ironwork are poked through the gap between the bottom two horizontal bars; this is more or less at the level of the the bottom of the concrete ring.
If William of Occam were alive today he would cut his throat with his own razor. Well, that's his problem. Admittedly, this is all a teeny-weeny bit on the complicated side, but it will support the fill in the gap between the excavation phase and the concreting phase and it is very quick to install. Up yours Occam. "Entities must not be multiplied beyond necessity", I ask you, whoever heard such rubbish?
Once the concrete in the first section has hardened, the shutter and the frame are removed and the rods are pulled out of the fill. There will now be a gap between the concrete plug and the bottom of the concrete pipe, which is just the right size to take a concrete block mortared into position. The jig can then be moved one place to the left and the whole process repeated, but this time, the right-hand side cheek is not fitted.
As stated above, the process ends with a hefty reinforced concrete foundation under the shaft, which should act as some disincentive to stop it wandering off on its own.
That's more or less it. Fiddly tedious details have been left out because of concern for the sanity of anyone who might end up reading this.
2011.016 & 017: Thu 24th & Fri 25th Feb
Having more or less finished the drilling jig / shutter support so now working on the shuttering itself, which is a separate unit. Cut the 3.2 mm (actually it was 1/8") steel sheet for the right-hand side shuttering and drilled the sheet and angle iron support so that they could be bolted together.
Cut the 3.2 mm (as before) steel sheet for the left-hand side shuttering and drilled the sheet and angle iron support with 10.5mm holes. The sheet needed to be bent outwards at 22½°. I had nothing that would bend sheet this thick, so had to grind a groove in the sheet then hammer it to the correct angle. The cut then needed welding, so started welding over it trying to avoid the dreaded banana distortion. Rain stopped play early afternoon before before the work was finished.
2011.011: Wed 16th Feb
More work on the drilling jig and creeping shutter. This part is to be held against the wall of the shaft using an Acrow prop from the opposite wall. This framework will support steel rods driven into the fill and also support the creeping shutter when that is completed.
(It's all rather confusing really).
2011.009, 010: Fri 11th and Sat 12th Feb
Alice Audsley, Tony Audsley
On Friday, Tony started work in earnest on the creeping shutter. This is a two part device. Firstly an anchor for the rebars used to support the roof of the excavated fill prior to filling the space with concrete. Secondly, support shuttering for the concrete itself.
Hopefully, the purpose and function of this device will become more clear to you as the construction continues. Even more importantly, I hope that the detailed design of the device will become obvious to me before too long.
On Saturday, Tony and Alice spent a day trying to fix the south wall of the hut, which is letting a lot of water in as the plywood wall is deteriorating and de-laminating. We coated the wall (AGAIN) with bitumastic paint then covered it with a layer of polythene, held in place with timber battens. The next step is to fix a couple of sheets of ply to the outside.
2011.002-004: Tue 18th, Sun 23rd & Mon 24th Jan
Alice Audsley, Tony Audsley
Finishing off the surface preparations (well almost !)
On Tuesday, Tony fitted the operating cable to the shaft signal bell. The cable now runs from the hut up into the headframe then down the shaft. No water was flowing down the shaft although the field was very wet.
On Sunday, Tony and Alice fitted a guide cable down the shaft to prevent the skip from catching on the fixed ladder.
On Monday, Tony wired up a light signalling system between the top of the shaft and the hut, then installed the wiring for a telephone and 12v power.