Pretensioning Bolts
Pretensioning Bolts
(OP)
Has anyone pretensioned a 3/4" bolt THEMSELVES and later removed it? Physically, how difficult was it? Would you recommend air tools to help with removal?
I'm looking at pretensioning bolts myself (don't ask why) and am trying to figure out how big of a pain this would be...
I'm looking at pretensioning bolts myself (don't ask why) and am trying to figure out how big of a pain this would be...






RE: Pretensioning Bolts
An air impact wrench would help, but to develop that kind of torque, you'll need an industrial model, commonly called a yo-yo. Otherwise, use a spud wrench with a "cheater bar" or pipe on it to get the required torque with less applied effort on your part.
RE: Pretensioning Bolts
RE: Pretensioning Bolts
RE: Pretensioning Bolts
RE: Pretensioning Bolts
RE: Pretensioning Bolts
Other than wrench, you will need tension gauge for installation.
If grouted in concrete using quick set adhesive (epoxy), you might have a tough time to retrieve the bolt (see "danger" above).
RE: Pretensioning Bolts
Looking back at some of my rocaps it looks like my 3/4" bolts tensioned at 200 to 320 ft lb. Not to difficult. As others have mentioned, a cheater bar works good or you can get a multiplier. Both will help, but 200-300 pounds is not that much.