Morning Everyone,
Regarding my earlier question about methods to remove magnet leg anchor
bolts from concrete the
consensus is that they must be broken or cut off. My thanks to everyone who
took time to reply.
The following copied replys cover the answers I received:
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according to some construction guys we've had here recently,
there is NO way to remove these guys w/o doing some pretty
heavy drilling and removing all the concrete around it.
they were 'cleverly' designed to never be removed....
john chung
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During the Northridge, CA earthquake the TMC magnet leg bolts of many
systems popped out. This was caused by torque when the magnet pushed
against the leg. So my guess would be that a long crow bar or other high
torque tool applied to one bolt at a time would ulltimately free the bolt
or fracture the concrete around the anchor. You will likely have to patch
the concrete floor afterward.
good luck,
Jerry
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The inherent nature of such a thing precludes that the only 'clever' way is
to saw them off and grind down the stub. If the magnet is energised, just
cover the bottom with 2-sided tape until the clean-up is done.
Cheers,
Jerry Hirschinger
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The standard TMC anchor bolts have a rounded head that is in the floor and a
slip fit collar. As you pull the bolt up the friction on the outside of the
collar starts to lock it into place and the rounded head on the bolt then
expands the flanges on the collar to lock it into place even more. It might
be possible that you can pound the bolt down into the floor, then using a
chisel catch the edge of the collar and pound that down a bit. At that point
if you can force some lubricant between the concrete in the floor and the
outside of the collar you might be able to get the collar to not engage with
the floor and it may pull up. But in order to pull it up you may need to
fashion a short metal pipe to allow you to use the nut on the bolt as a way
to lift the entire assembly. I had to install one of these on a floor that
had a 1 inch metal plate and until we got below the plate and into the
concrete there was not enough friction to hold the collar so the entire
assembly kept pulling up out of the hole. I have a suspicion though that you
might succeed on some of the bolts with this but not all.
Good luck.
You did not mention, do you have to do this in the presence of a magnetic
field? If not I would just cut them off.
Joe Dumais, Ph. D
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they normally use an angle grinder ('cutting disc')
which unfortunately produces a lot of magnetic particles.
To (two) counter two nuts with each other and loosen
the bolt in the concrete dont'n work, I suppose.
Perhaps it's worth a try.
Godd luck,
Robert
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Carl Bachmann
robert.bachmann_at_utsouthwestern.edu
Department of Biochemistry
UT Southwestern Medical Center
Dallas, TX
voice 214-648-6748
Received on Wed Apr 20 2005 - 17:25:39 MST