I have been working on remodeling my bathroom. As part of the renovations we have decided to replace our old tub with an acrylic claw foot tub. The tub is extremely light weight. I am assuming that it needs to be anchored some how so that there isn't constant strain on the plumbing for the drain. I talked to the plumber who helped me move the plumbing when I first started the remodel, but he did not have any answers for me. My floor is ceramic tile, and there is basement below the bathroom so I can get underneath the floor if needed. What is the best way to anchor this tub?
I believe you just set it on the floor and let the weight of the tub and connected drain pipes keep it from moving.
If you are really worried about it moving you could mount some sort of small block to the floor behind where each leg will sit. It would not be attached to the blocks but with for of them the tub would not be able to move. But that may not work well with your tile floor.
1) Epoxy ; just glue the feet down. Or embed bolt heads into the floor material with a shallow "blind" hole and epoxy then nuts and washers to bolt the feet down.
2) lag bolts into the floor ; make a fender washer fit to the inside geometery of the feet and lag it to the floor (drill tile if/as necessary
3) Bolts thru the floor ;
You can procure "suck-rod" nuts (couplings) to screw onto the existing leg attachment bolts and add stainless all-thread rod (bolt) to whatever length you need to get thru the floor where you can use a locking nut to snuggle the tub legs down to the floor.
These "suck-rod" nuts are used in windmill pump shaft connections to join suck rods (the rod that runs the cylinder up and down) Ace stocks them.