How Do I remove Headless 1/4" lag Bolts from Concrete?

cut a slot in them with a dremel and use a screwdriver?

using a left handed drill bit could back them out enough to get a pair of vice grips on them

Do you need to remove them for some purpose, or are you just concerned with the busted stubs sticking up? If the latter, just grind them down flush with a 4" angle grinder and let it go. Patch and paint as necessary.

nate

I need to remove the lags to put new flanges/lag bolts in for the new railing.

I could try that but the appear to be quite deteriorated .

I once had to remove anchors (nails driven in with an explosive charge) from concrete and simply used a circular saw (w/ eye protection).

Take a grinder and grind them down flush. Done.

Move over an inch and use new wedge-it bolts. After you grind the old ones off flush.

Depends on how well they are in there. You can use an "easy out". available at any decent hardwqare store. You drill a pilot hole, insert the easy out and with a wrench try to turn the lag out. Once started it can come easy, but if well stuck in the concrete it may be impossible.

I fonly that would solve the problem. I've got to install flanges, same dimensions, over top the place where the original s stood.

It may solve some of the problem. Can you turn the flange 90 degrees and use new holes? Or drill new holes in the flange at new locations?

Vice-grip brand vice-grips, put on tight or very tight, then hit with a hammer in the direction to unscrew the bolts. Especially the ones that are bent will be able to be turned.

I would try drilling with a good high speed drill bit. It may be sacrificial, but use one at least the same dimension as the bolts or maybe start with something bigger then go smaller. Use a hammer and a pin punch to get a flat surface for the drill bit to sit on.

Get a jackhammer and dig them out. Then pour new concrete.

attempted to drill

the old holes will be too detoriated by the rusty bolts expanding to re use......

so grid off old bolts add flange and start over

You may need to put the new flanges in different spots. Grind them down and paint over may be a lot easier than gettting the old lags out. Hammer drill is useful for making holes in concrete.

Not sure there is much we can do to help.

Yes was going to say; grind the old ones flat, mark a significant punch hole to get drill started. Use good drill bits same size as bolts and drill carfully, you may break off the drill bit which could give you another problem!

OR: Grind flat, move new railing half to one inch over and drill new holes in concrete?

Do the new railings have to have identical mounting points as the old? Why?

On Tue, 12 Aug 2008 06:44:53 -0400, "John Grabowski" wrote Re Re: How Do I remove Headless 1/4" lag Bolts from Concrete?:

And use plenty of oil at the tip of the drill bit.

The lag bolts are screwed into concrete? This doesn't make sense.

Are they actually bolts screwed into anchors that are embedded into the concrete?