Like others said, all depends on the soils. After that, it's pretty simple to design a foundation. A 25ton crane isn't very large, but crane beams need to remain level, so you don't want much differential settlement. Depending on horizontal loading (wind or other), I'd use piles under pile...
About 4 years ago, we performed beam strengthening using carbon fiber sheets. This was under a crane beam in a port pier deck over salt water. We cleaned up the concrete between piles, chipped back behind the rebar to gain at least an inch of grout under the bars, applied epoxy and a grout...
Humm.. Page cannot be found. Need a few details, and I can help. I've spent 40 years doing underwater and waterfront engineering projects, including foundation shoring under water. If you can't build a form, stack bags of pre-mixed concrete in place, assuming you have a foundation on which...
