Buddy almost died under his lift at his personal shop. Anchor pulled the 4" concrete up when his girl's truck was on it. Ended up having to repour the slab with rebar.
Test drill first and make 100% sure you have adequate depth with every anchor. 4'-6" depth without rebar is okay as long as you're not lifting a tank. Keep an eye out for stress cracks and retorque the anchor bolts every once in a while.
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no wonder he almost died. the anchor bolts were improperly installed. the bolts only pulled up 1.5 to 2 inches of concrete. if he had sunk them the full 4 inches you wouldn't have that issue. also remember to vacuum out the hole post drilling and blow out for extra measure. run the nut on the anchor one nut width so the stud is flush with nut and drive home with a sledge hammer and tighten down to spec. the lift drawing should give you all the parameters of floor and anchors.
