I haven't done one but Jack Olsen did and his garage is one to behold.
Taken from
Scissor lift in garage floor help which has some good information.
Quote:
Originally Posted by Jack Olsen
Here would be the steps.
1) Work out what space you need, and include a plan for electric and/or hydraulic lines running in and out of the space. Also think about water drainage or putting in a pump if that will be an issue.
I used tape to make sure I had the right location and also to mark the space I needed.
2) Rent a wet saw and cut your square. Cut up the rest of the inside space and you won't need to rent a jack hammer.
3) Break up the concrete, dig out your hole.
This is about 1/3 of the dirt I removed. And I was only going 16" down.
4) Drill for rebar tying into the existing slab. Build your forms.
5) Pour your mix. Let it set.
6) Cross your fingers that you did everything right and drop the lift in.
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