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The DERBYSHIRE CAVER No 140 Spring 2016 Titan shaft repairs – the delicate task of lowering the glass fibre former into position IN THIS ISSUE – • Dave Nixon on repairs to Titan access shaft • Ashley Hiscock on an epic dive in P8 • Pete Knight details DCA projects completed in 2015 • An ancient history of Eldon Hole exploration and more . Published by the DERBYSHIRE CAVING ASSOCIATION £2.00 £2.00 THE DERBYSHIRE CAVER No 140 Spring 2016 Editor: Material for inclusion can be sent hand-written or via email. Mike Higgins Please send contributions for the next issue as soon as they are ready. 56 Robin Hood Crescent Edenthorpe The views expressed in this publication are not necessarily those of the Doncaster editor nor of the Derbyshire Caving Association. DN3 2JJ Email: [email protected] The website of the Derbyshire Caving Association is at: www.theDCA.org.uk CONTENTS: Editorial . 3 How to Repair a Hole in a Field . 4 Diving In P8 . 6 DCA Project Officer’s Report. 9 Eldon Hole - A History of Exploration . 10 Crewe CPC SRT Training. 14 DCA Officers for 2016 . 15 Speedwell photographs. 16 THE DCA - WHAT WE DO AND HOW TO JOIN US DOING IT The aim of Derbyshire Caving Association (DCA) is to protect the caves and promote good caving practice within the Peak District and surrounding areas. Membership is open to all clubs, individuals and outdoor activity providers with an interest in caves and caving or mine exploration. Check out the DCA website for further information (www.theDCA.org.uk). Membership enquiries should be made to the Secretary at [email protected]. The newsletter of the DCA has been in publication for over fifty years and is of paramount value as a forum for cavers in the Peak District. The Editor welcomes contributions from all cavers, whether DCA members or not. News, articles, photographs, letters for publication, etc. should be posted or emailed to him at the above address, or give him a ring on 01302 882874. The Derbyshire Caver is posted free to DCA members; non-members may subscribe by sending a cheque for £9 (payable to DCA) for four issues, to the Secretary or Treasurer. Some back issues are also available for sale. Quarter-page adverts are £5 per insertion. Current issues of The Derbyshire Caver are available from the following outlets: Hitch'n'Hike, Bamford; The Old Smithy Teashop, Monyash; Peak District Mining Museum, Matlock Bath Editorial Welcome to the first issue of The Derbyshire It is labelled “sough tail, Bakewell, 1962”. Caver for 2016. There is a wide range of Does anyone recognise the location or any of articles in this edition which I hope that the three people in the photo? Please let me readers will find of interest. Dave ‘Moose’ know if you do. Nixon has kindly provided an account of the repairs to the Titan access shaft, Ashley Photographs for the back page are starting to Hiscock tells the tale of his recent dive as far come in regularly, so at least for the time as sump 10 in P8, Pete Knight, DCA’s Projects being you will be spared any more of mine! Officer, gives details of work carried out This issue has pictures of Speedwell Cavern during 2015, Alan Brentnall has done a write- provided by Phil Wolstenholme. A new book, up of some recent SRT training and I have The Castleton Mines - a Descriptive and Visual written a history of the early exploration of History, is shortly to be published, authored Eldon Hole. jointly by Jim Rieuwerts and Phil, and these photographs were taken on shoots for the Included as part of the editorial in the last book (but are not amongst those to be issue were three underground photographs published therein). The book should be out provided by Mark Higginson of the Derbyshire around the end of April, published by Peter Record Office in the hope that readers may be Miles at Hucklow Publishing. able to identify the location at which they were taken. I am pleased to say that one of Whilst we’re talking about the Castleton area, them (the one at the bottom of the page) was work continues on the Longcliffe project identified by Geoff Peppit of Derbyshire featured in the Winter 2015/16 issue. No Pennine Club as having been taken at or near breakthrough yet but the amount of spoil Rutland Cavern in Matlock Bath on 3rd June being removed has necessitated the 1905 during a Kyndwr Club meet and pictures installation of an additional 1·5 metre section Colin Christie. Unfortunately, no result yet on of entrance pipe around which to stack it and the other 2 photographs. I came across it seems likely that the shaft mound will reach another mysterious photograph browsing its original height. through Picture the Past website and Mark kindly sent me a copy, reproduced below. If you are interested in hydrology, as I am, then I would draw your attention to the possible reformation of the BCRA Hydrology Special Interest Group, to be discussed at Malham on 14th May. If the outcome is positive this will be followed up by a further meeting, possibly at Eurospeleo in August. Finally, as always, please help to support the DCA and this publication by sending in articles or photographs, letters or surveys – if you’re thinking about writing something up, do it! Photo: Frank Nixon Mike Higgins 3 HOW TO REPAIR A HOLE IN A FIELD This is no ordinary hole in a field, it’s on the top of and inevitably openings behind the ring existed Hurdlow high above Castleton and represents the and were left open assuming the fill would access point into Titan at the southwest limit of eventually occupy the space. As it turned out the Peak Speedwell system. rather than the fill occupying the space the liner would deform by means of being loaded at a The 48m deep entrance shaft took four years to contact points and thus occupy the space. Had we sink and involved a variety of tactics in terms of filled the spaces to prevent this happening then it digging, engineering and shoring. The first section may be the case that any rework wouldn’t have of the shaft was excavated using a JCB in 1999 and been required. lined with pre cast concrete rings with an internal diameter of 1500mm. From this point excavation As it was, the situation of the deformation of the and shoring was relatively easy with two solid liners was an issue that by 2015 was clearly not walls to work between, unfortunately this didn’t going to resolve itself. Not only were the linings last long. With one wall disappearing off to the deformed by up to 100mm but they were also south some serious head scratching was done in fracturing under the pressure of the glacial fill order to carry on with the excavation work and still bearing in on them. If nothing were done there is maintain a shaft of a uniform diameter. The no doubt that there would have been a solution came in the form of glass fibre sewer catastrophic failure of the lining which would liners, 1400mm in diameter which could be cut result in a total collapse of the shoring followed by and installed as shoring then re set to preserve the major subsidence on the surface and permanent aperture. This worked wonderfully and progress loss of access to Titan from Hurdlow. Plenty of was relatively fast in digging terms. In all 15 room for improvement there. sections of glass fibre lining were lowered and fitted into the shaft which led to the ultimate More head scratching and beer drinking required. challenge, solid rock. Yet more head scratching and beer drinking about whether or not to offset Initially the plan was to purchase some doubled the shaft or alternatively keep it vertical and drill walled corrugate pipe sections of the maximum our way in Titan. The alcohol may have diameter possible and simply lower them over the contributed in the decision to do some hard rock affected areas and walk away. This wasn’t as mining. cheap and as straight forward as you might think so we opted for an alternative solution involving This slow and arduous process continued for the our old friend concrete. greatest timescale in the project but eventually in May 2003 the team involved broke out in truly impressive style into the top section of Titan. Job done, time to move on. Forward wind the clock eleven years and ‘Houston we have a problem’. In retrospect the shoring error that was made involved the un even loading of the circular lining. Prior to the installation of a glass fibre ring a hole was dug out as deep and as circular as possible to accommodate the positioning of the liner. Perfectly circular isn’t something that’s easily The temporary bracing in the shaft achievable when excavating in bouldery, glacial fill Photo: Dave Nixon 4 The plan was to firstly install some temporary In all seven casts were completed using the same bracing on the worst areas to prevent any more method each time, this then covered the entire deformation. Then five, 32mm x 1m deep anchors section of deformed liners and only reduced the were placed in the solid rock section above the diameter of the entrance shaft by 200mm. The failing area. Hanging from them were a series of final cast included a horizontal tie back to the solid 16mm cables which are designed to take the rock at the top of the old liners which will add to weight of the concrete to follow.