Removing epoxied in large diameter threaded rods from concrete

[Zeth4500]

Usually at my job, we just cut them at the base, move 50mm to the side and drill a set of new holes. 30mm holes. that thing is not forgiving if it decides to bite the concrete, your body breaks before that machine does
with any problem there is a solution, and this time it was actually really easy
you just take a piece of tube a forklift can go into, weld the respective nut onto it (very durable welds) and then you screw it on the end of the threaded rod sticking out of the ground, then you go as deep into it with the forklift as you can and carefully lift it up. just when you think it didnt work it will jump up a bit, jerking it a bit back and forth, from side to side helps. if its a bad day the bolt snaps.
394018
other ideas for removing these bastards are very welcome, i do see potential in some kind of a bolt device with this but i cant quite imagine it yet. maybe torching them so the epoxy gives up would work? if you can unplug all of these you dont have to drill in new holes in the ground- we use these for securing beams that hold the conveyer belts, it happens that a large machine runs them over- effortlessly.

[pipeclay]

That was a little bit clearer than mud.
We don't have or make tube big enough to drive a fork lift into in Australia, it would all need to be fabricated.

[BobL]

Heating the rods should soften the epoxy.

[jack620]

if you can unplug all of these you dont have to drill in new holes in the ground- we use these for securing beams that hold the conveyer belts, it happens that a large machine runs them over- effortlessly.

Hello Zeth. If you are reusing the existing holes, why are you replacing the bolts?

[.RC.]

Must have been a sub standard job of putting the bolts in. Done properly they should rip out the concrete.

[wheelinround]

An oversized easy out?

Oversizetd left hand drill?

Cryo freeze the bolt hit it with a jack hammer hope it shatters. Or larger shifter undo it.

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[jack620]

Must have been a sub standard job of putting the bolts in. Done properly they should rip out the concrete.

Yep. I hope they drill out the old epoxy before gluing them in again. And thoroughly remove all the concrete dust. Otherwise the whole exercise will be a WOFTAM.

[Zeth4500]

Hello Zeth. If you are reusing the existing holes, why are you replacing the bolts?
the bolts are usually bent, they hold down a 20mm steel plate which has a 200x200 pipe ontop, and if it needs replacing then its because a front loader rammed it

we do have large keys designed to be hit by a hammer, but theyre situated 200mm into the concrete, plus i would have to bring a welding machine to do the job, and welding rods, and welding helmet, and get permission to use fire hazard tools, and ventilation gear
i could then maybe use a large fasterner but the biggest one we have runs on air pressure, i do normally bring an air pressurizer to blow the holes clean from dust- but anything turning the threaded rod might not work as its an irregular hole with epoxy concrete glue in it

a real sub-par job is to do it when its raining, my boss told me it wouldnt be a problem, but the epoxy didnt bind one slight bit, so that was half a day wasted- im paid by the hour luckily.