If you aren't sure you can make screws hold in a concrete ceiling, I would suggest standing a 12 ft. 2X6 from floor to ceiling and a 2X4 "t" across the top. Bogen makes some "chain drive" systems that are pretty economical. I have seen this done several times in rented spaces.
I built two frames using angle iron and casters and put the bogen drives on them. Now I have four backdrops on each roll around dolly and can roll them out of the way when I don't need them. Rick from Arkansas "Arkie"
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