Something to consider prior to a new pour for your shop floor. I inserted 5 truck receiver hitches, with the re-inforced collar, vertically into my floor when we did the pour. I welded some rebar across them prior to installation. I have 5. One is centered at the far end centered on the main overhead door. I figured that one would be for winching a dead vehicle in if necessary. The other four are arranged in a rectangle about 8x12'. I figured they would be useful for metal work mostly on the horizontal (I'm a pipe fitter by trade and remember the old timers working on the bending beds in shipyards using pull points on large pipe bends. It is something to see.), but have found that they allow me to have a knock down anchor point for a vertical rack. I picked up five pieces of Unistrut and few strut fittings for the actual rack. I have used it mostly for fabbing fences and gates and it has worked out really well. it takes me about 20 minutes to put ti up or take down. My ceiling is 10' and I installed a couple Unistrut angle clips in the ceiling bolted through cross bracing in the rafters. I didn't think far enough ahead when I put these in the slab and was fortunate to just miss one of my light fixtures in the ceiling. The actual inserts for the slab receivers are trailer hitch parts as well. I went with the 1/4" thick tubing and welded a cross piece that lays flat on the slab. That compensates for the lack of precision in placement in the slab. I had a crusty one legged finisher do the pour. He was like, "you want me to do WHAT?" Drill that cross piece for a 3/8 bolt and you have a floor anchor that lets you do things you haven't thought of yet.
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