quote:Originally posted by johnk:quote:
FYI you really should "drill" in some reinforced concrete footings through the slab for the legs on the lifts.
A 3" slab in a residential garage is nothing to stand these things on.
They can do an awfull amount of damage to the surroundings when the topple over.
I find that suggestion curious. The base plates on my Backyard Buddy lift are 12x12. I doubt the contact patch of a 335-35-17 tire is half that, and a more conventional tire perhaps 1/3. Assuming a 3000lb Pantera on a 2500 lift, that's 5500lbs / 4 = 1375lbs per leg or 98 PSI. A 5000lb SUV in my garage would probably triple the PSI with it's contact patch of perhaps 1/3rd of a Pantera, and I don't believe it's going to break through the floor and topple over.
I do agree with you about the unlikiness of anything happening. After all the weight on each post is going to be no more then 800# plus the weight of the posts. (on a four leg post).
The load on the two legs would be the issue here.
The local building departments are involved in them also. They want a "minimal footing" under each which translates into a 12" diameter by 12" deep where the footing is not subject to unheated and thus freezing temps. If it is, and it would be safest to consider them as potential freezing, they would have to be 42" deep as well.
I'm sure that most will have no problems just sitting on the floor and equally as sure that there will always be a horror story, just because of human nature.