Shop Lift Anchor bolt questions

[71blackcheyenne]

Gonna be puttin my 2 post hoist in soon, has anyone ever hit a piece of rebar while drilling the holes for the anchor bolts? What is the procedure to correct it if a guy does hit rebar?

 

[mrobins297aaa]

move the hole, i don't know of any way to drill thru them

 

[BarnFab]

just chnage drill bits and keep on going ( ie from massonary to HSS)

 

[mrobins297aaa]

just chnage drill bits and keep on going ( ie from massonary to HSS)

I'm just curious have you ever done that with success?

 

[Bob C]

The concrete bits I use are a high grade. I have installed alot of lifts and hit rebar and wire on many occasions. I just let the bit hammer away and it will slowly chew thru the rebar. You will be able to see the small metal chips come to the surface of the dust pile around the bit as it is hammering. Wire is a bigger pain as it bends around and twists up around the bit. You just have to keep wrestling with it to get by wire. The only time I have ever had to punch a new hole in the baseplate was when some jackass buried a 2 inch steel plate under the concrete. That type steel was much harder than rebar will ever be. I'm not saying it is a breeze to drill thru rebar, but it can be done. The bit almost never lands directly on the top dead center of the bar, it usually glances the sides and this makes it easier to get by the rebar.

 

[lotsoftools]

You can also get rebar cutting hammer bits.

 

[mx842]

Yeah like Bob C said, just hunker down and let the bit do it's job. That is if you are using a real hammer drill and not one of those small hand drills that has a hammer setting. The bits you get for the small hammer drills are not made like the drill bits for the spline or SDS drive hammer drive drills.

A good hammer drill turns at the proper rate for the hammer force that is being delivered to the drill bit so it lets the bit cut away at what ever in in the hole with little effort without walking from one side to another. The hand drill hammer drills turn too fast for the amount of hammer force being applied to the bit tip area and they dull easily and when the get dull all you are doing is burning up a drill motor and making the power company happy.

 

[ydna]

If it's really subborn, you can core the hole instead of drilling it. It's a different machine though. IF you core the hole you'll go right through the rebar. If you can't finish it you could hire a company to come and core the last hole. Likely a $100 job.

As far as drilling anchors goes, I'd agree, the right drill makes a world of difference. Make sure you blow out all the dust too. Otherwise the anchor will not go in. It will stop half way and get stuck for all eternity.

 

[cyamaha2007]

Ive hit rebar more times than i can count. I have anchored 300 plus machines to the floor tho. Just ride out the storm. Use a real hammer drill and a good bit i prefer hilti. If you have wire mesh in the floor, it can stall the bit you will need to run the bit forward and reverse till the wire snaps. Also drill all the way through the slab just keep drilling till you have a through hole in the slab, If you ever move it or a anchor needs replacement you can drive the anchors into the soil under the slab.

 

[wssix99]

Gonna be puttin my 2 post hoist in soon, has anyone ever hit a piece of rebar while drilling the holes for the anchor bolts? What is the procedure to correct it if a guy does hit rebar?

This is not typically a problem with lifts because concrete slabs on grade don't have rebar in them.

You may hit some reinforcing mesh half way or at the bottom of the slab, but that won't cause you any issues and you probably won't even notice it.

 

[1grnlwn]

I re-barred around my post areas. 8" thick.