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Bolt Chopping 101

herbie

2-Jul-2009
5:01:52 PM

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.

ajfclark

2-Jul-2009
5:05:30 PM

There's some discussion of bolt removal here: http://www.safercliffs.org/code/tips.html

nmonteith

2-Jul-2009
5:07:34 PM

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?

herbie

2-Jul-2009
5:17:51 PM

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?

nmonteith

2-Jul-2009
5:31:01 PM

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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