We do box jacking and so I can reply to a few of the issues brought up here. First, box jacking may be the best method when there are cobbles or debris because the box, if cast full length, would be harder to deviate than a shield at the front of a string of pipe. If passing close beneath...
My company does box jacking and pipe jacking. Pipe jacking is done by adding individual lengths of pipe sequentially and pushing the ever-lengthening column of pipe into the ground. Our preferred method of box jacking is to cast the entire box full length on a "launch slab" and then jack the...
