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2-Jul-2009 5:01:52 PM
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There seems to be a few options so I was wondering whether anyone could offer some feed back.
1. Tighten nut to such a point that the stud shears.
Not to sure about this as I am guessing there is a chance the stud will be left proud of the rock.
2. Simply beat the stud with a lump hammer and chisel.
I would of thought there is a good chance of damaging the rock around the bolt.
3. Cordless angle grinder.
This one seems the simplest - remove hanger and start cutting, I presume you can then put a grinding disc on to finish the job off.
4. Hacksaw.
Sounds like hard work, see #3.
I would be happy to hear advice on any alternatives.
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2-Jul-2009 5:05:30 PM
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There's some discussion of bolt removal here: http://www.safercliffs.org/code/tips.html
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2-Jul-2009 5:07:34 PM
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Exactly what sort of bolt are you trying to chop? A dynabolt or trubolt? Are you chopping it to replace it - or just to remove it?
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2-Jul-2009 5:17:51 PM
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cheers for that ajfclark.
nmonteith, I thought dynabolts and trubolts operate on the same principle. Can either type be removed without having to cut the stud?
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2-Jul-2009 5:31:01 PM
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Dynabolts are pretty easy to remove as they have a sleeve. You just need to get hold of the sleeve with a needle nose set of pliers and pull it out. Then remove the stud with your fingers. (sometimes you will need to chisel or drill a little bit of the rock away from the edge of the hole so you can grip the sleeve with the pliers).
Truebolts on the other hand don't have a sleeve, so you can't pull them out easily. First just try tapping the stud back into the hole (most people drill a hole deeper than the bolt). If this doesnt work get a socket set and a bit of pipe on the spanner and twist it until the bolt snaps off (usually always flush with the surface of the rock).
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