Can you either post a picture or be more descriptive about the frame, like where it is in relation to the sink, what design it is, etc.

My parents concrete sink was just sitting on a base made of L shaped pieces of metal bolted together, like you could get at a big box store. The base wasn't actally attached to the sink. The weight of the sink kept it stable on the base. I never knew it wasn't attached until we went to take the sink out (and wow, that sink was heavy!)

Just make a new base. I've got the same thing in the basement, except its not rusted.

Thank you! I will try to get more details and a pic when things calm down. Happy turkey day!!