anchor in my garage floor??

[crosby]

anybody put an anchor in their garage (cement) floor? I have a Jimmy in my driveway I am going to pull the motor out of, and would like to pull it closer to my garage, if not all the way in with a come along (hand winch). I am thinking of drilling a hole in the floor, and installing a threaded shaft in there (I am thinking of a hex shape for some reason) and cementing it in with hydraulic cement. I plan on installing a bolt to keep it clean and non-intrusive when not in use, and maybe put an eye-bolt in to anchor my come along to when I need it. Any thoughts? Would this likely cause leakage or water problems with my garage floor? There is a good amount of gravel below the garage floor, as it is a garage under house, just built. Thanks very much for any help you guys can provide, especially if you have done it yourself, or thought of something else. A couple of people strongly advised that I don't attach a come along to a lolli-column... that could have been bad.