Bolting Resin
- Thread starter USSCC
- Start date
Bob Mehew
Well-known member
Info on BCA's set up is at https://british-caving.org.uk/wiki3/doku.php?id=equipment_techniques:anchor_scheme . The accepted anchors used by BCA come from http://www.bolt-products.com/ProtectionBolts.htm .
Cavematt
Well-known member
Worth a read of the article in CNCC newsletter #9 (March 2019)
https://cncc.org.uk/publications/
There is an article on the back page about the resins used for the stainless steel IC anchors, which may be useful. Not sure about the relevance to Thunderbolts and Petzl anchors though.
https://cncc.org.uk/publications/
There is an article on the back page about the resins used for the stainless steel IC anchors, which may be useful. Not sure about the relevance to Thunderbolts and Petzl anchors though.
Pete K
Well-known member
If you're not sure about the process or picking the right anchor for the substrate, I highly recommend getting someone who is to help you or drop onto a bolting course yourself. Nothing more dangerous than a bad bolt that looks safe.
Happy to chat about anything on PM as I place a lot of anchors in a personal and professional context.
Happy to chat about anything on PM as I place a lot of anchors in a personal and professional context.
MarkS
Moderator
Thunderbolts will gradually loosen if used for prussiking, and as far as I am aware they are never normally used with resin. I can't see how they could be.
I would suggest using a specific resin anchor (the same or equivalent to those installed under the BCA anchor scheme). Many of the BCA anchors are installed with Fischer FIS V resin, and more recently the higher spec. Fischer EM+ resin has also been used. Feel free to pm if you want further details.
I would suggest using a specific resin anchor (the same or equivalent to those installed under the BCA anchor scheme). Many of the BCA anchors are installed with Fischer FIS V resin, and more recently the higher spec. Fischer EM+ resin has also been used. Feel free to pm if you want further details.
pwhole
Well-known member
The main problem with concrete screws loosening is usually over-tightening, which introduces an angular stress (twist) into the anchor, steel being slightly flexible, which slowly untwists itself after use, leaving it loose next time. I usually tighten it up fully to make sure the thread is cut, then turn it back a quarter-turn to remove the twist and then tighten it back up 'just enough'. Generally it'll stay in place after that. We used fixed rigging on these every weekend for three years and never had one loosen after the procedure above. And as Mark points out, there is nowhere for resin to go, as the screw fills the hole completely.