+1 for concrete screws. Not a long-term option, but by far the best conservation-wise before deciding whether more permanent anchors are warranted.If any of your group are unhappy with concrete screws, have a read of this and this, and consider on what basis you might be happier with throughbolts or expansion anchors.
I am sure the BCRA or BCA did some research on this as I saw the test bolts in Braich Goch. But I don't know where the results are.Chris.
We have been granted kind permission to explore mines on a farmers land. First adit ,we hit a natural pot with a sizable chamber visable at the bottom .what are people toughts on the approach to bolting this initially? we have disscussed the many options from concrete screws to chemical anchors,but some of us dont feel happy with the concrete screw option.given there is a high chance caver access would be granted in the future, i was interested in peoples opinion of weather to pop in some temporary anchors or bolt it properly from the start?all opinions welcome,including anchor selection/resin.
Quote from: ChrisJC on April 15, 2021, 07:43:07 pmI am sure the BCRA or BCA did some research on this as I saw the test bolts in Braich Goch. But I don't know where the results are.Chris.MarkS above has given the links in post 4. Mark is also the BCA E&T convener.
This was another test - it was done underground in slate.Chris.
Quote from: ChrisJC on April 15, 2021, 09:53:41 pmThis was another test - it was done underground in slate.Chris.Was that the one done by Miles M a few years back in Cwmothin?
but I'll wait for sinker to get home first
As a absolute novice in srt may some one send me a link to a picture of the bolts some people are saying are bad ? So I can check if I ever see any please
Quote from: Down and beyond on April 16, 2021, 10:08:31 amAs a absolute novice in srt may some one send me a link to a picture of the bolts some people are saying are bad ? So I can check if I ever see any please There are hundreds of different types / sizes / materials etc but typically they look like this:https://www.screwfix.com/p/easyfix-bright-zinc-plated-carbon-steel-concrete-bolts-m10-x-100mm-10-pack/5800P?tc=CA8&ds_kid=92700048793290424&ds_rl=1249413&gclid=EAIaIQobChMIzOLTubqC8AIVi9d3Ch19zAJpEAQYBCABEgKW_vD_BwE&gclsrc=aw.ds!!! AVOID !!!
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