Concrete Pads

[SeanM]

Not exactly sure if this was the right place to post this, but it relevant to flooring.

I ordered a lift a couple days ago and although the flooring meets the requirements based on thickness in compression strength I a pretty good crack close to where I want the lift to be placed. The instruction manual states if the bolts can not be torqued to 85 lbs-ft that pads should be installed under the posts which are 4'x4' with a 6" thickness of 3500psi concrete.

Has anyone on this site done this? I planned on doing these pads 12" deeps as that closely relates to 1 cubic yard. I know they need to be keyed to the existing floor but should it be tied in to existing floor with rebar, should the pads be rebar re-enforced, if not is fiberglass re-enforced conrete recommended?

Any suggestions would help very much.

Thanks

 

[gnxtc2]

I did what you want to do the beginning part of January (shop has heat).

What we did:
- Cut the floor with a gas demo saw
- Jackhammered out the old floor
- Dug down 12"
- Dug under existing slab approximately 8"-12"
- Compacted with jumping jack
- Filled hole with water to settle any loose dirt
- Installed pins - drilled sideways into existing slab
- Made a mat of 1/2" rebar
- Since the hole was small, we opted to lay the mat on a bed of concrete instead of "chairs"
- Cement truck came with the white gold (concrete)
- Put approximately 3" of concrete on the bottom and laid the rebar mat in
- Filled the rest of the hole up
- 3" of the top, we put some wire mesh in.
- Filled the rest.

Billy T.
[email protected]

 

[SeanM]

Billy,

That is exactly what Iwas looking for. I will be starting on this next weekend.