[Hook up a large welder to the frame and let it melt the ice under it
Have you ever tried this and had it work ? The old timers used to talk about it but I have a small 7'' steel pipe culvert under my driveway that freezes and I have left a welder on it for many hours and it didn't work. I think what might work in my case and I haven't tried it yet is to string a heavy copper wire and let it freeze in and hook a welder to it , Less surface area to heat.