Thread: Measure concrete slab thickness

Originally Posted by one_iota

Well I'd have to take the advice of a lawyer to be sure of that. That would be much more expensive than an engineer. ;-)

I'm sure there's one on here lets ask him bahahah (extends olive branch)

Originally Posted by LRJim

Another option is to get some 20mm plate and spread the weight over a larger area.
But don't take my advice you will get yourself killed.

Do should I take your advice to not take your advice?
The reinforcing plate is an option I had considered , although it would raise the minimum pickup height of a hoist which would be fine for LRs but make it a a bigger PITA for lifting low race cars.

Originally Posted by weeds

Does your hoist come with footing details??

I don't have a hoist yet. Just working through preparations.
But good point that a suitable hoist may come with details of specific requirements. Thanks.

Originally Posted by Disco4Dave

Do should I take your advice to not take your advice?

Hahaha just having a bit of a crack.
The main concern is how strong the ground is under the slab,it could be hollow from erosion and the ground settling.
If it was me I would dig down and make pads for the hoist to sit on just to be safe. Really there's isn't a great deal of weight it's just the small area it's on.
You really need to get the drill out and suss it out.
If you go down the engineering path they will most likely want a soil report then they can determine what alterations are needed if any. Might be worth a phone call they could say a 100mm reinforced slab will be able to take the pressure on such a small area.
There's should be some specifications with the hoist when you get it, but I doubt it will have recommended footings depth because it all depends on the dirt.
But being a builder I would just do it myself and overkill it.
Hope to see some photos when you get it happening!
Cheers Jim

Originally Posted by LRJim

Hahaha just having a bit of a crack.
The main concern is how strong the ground is under the slab,it could be hollow from erosion and the ground settling.
If it was me I would dig down and make pads for the hoist to sit on just to be safe. Really there's isn't a great deal of weight it's just the small area it's on.
You really need to get the drill out and suss it out.
If you go down the engineering path they will most likely want a soil report then they can determine what alterations are needed if any. Might be worth a phone call they could say a 100mm reinforced slab will be able to take the pressure on such a small area.
There's should be some specifications with the hoist when you get it, but I doubt it will have recommended footings depth because it all depends on the dirt.
But being a builder I would just do it myself and overkill it.
Hope to see some photos when you get it happening!
Cheers Jim

I reckon it'll end up cheaper and easier to find a 4post hoist .... with belly lift if you really need it lifted off its wheels

Don't forget you've got a lovely big shed around the hoist, you could anchor the tops of the posts to the shed legs.

Originally Posted by DoubleChevron

I reckon it'll end up cheaper and easier to find a 4post hoist .... with belly lift if you really need it lifted off its wheels

A hoist would be mainly used for work on our race cars, doing anything from wheels/servicing to engine/gearbox/diff/suspension swaps, and then also some basic stuff like wheels and brakes on the D4. I'm getting too old to do this stuff crawling around/under cars on stands :-)
My (limited!) experience is that a 2-post gives easier access than a 4-post.
Also FWIW, I only have about 3.4m clearance.

If it's only a 2 poster make your pads 1x1x1m then. The main concern is stability and anchoring it to the ground.
Use high tensile all thread in your pads as the anchor points maybe. This should be in the specs for it.
Props to bee I'd definitely tie it in to the shed if you can. I don't have a lot of trust in 2 posts but it all depends on the anchor points you have.

Cheers Jim

See if the council has the engineering papers for the shed. It should be specified shouldn't it.