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Unless the slab is cracked into sections I'd be bolting directly to it. Do you know if it was reinforced when poured? Dynabolts would be best but don't drill right through the slab and into the dirt underneath, I did that once. Some people will say that by bolting to a slab that your walking on you will induce vibration into the pier, and thus you should cut out the centre and dig down and set the pier into a purpose poured base completely detached from the floor. How obsessive are you?
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