Hello - hoping this is in the right spot. We moved into a house that has a concrete "bunker" under the garage. The walls are 12 inch thick concrete, and the ceiling is essentially the underside of the garage floor. I would assume it has to be heavily reinforced in order to hold 2 cars. I have built a large wooden play structure in one half, and I think it would be nice to put a couple of swings in for my kids. I would of course purchase the appropriate concrete anchors and bolts and I have lined the floors with thick rubber mats. I'm wondering if I should have concerns about the concrete ceiling and its ability to hold swings? I can provide pictures if needed. The ceiling looks like it is several large slabs with seams in between. Thanks in advance.