Abstract: A bucket is set to surround an upper end portion of an old pile, and an intermediate portion of the pile is radially cut by jetting high pressure water from the bucket from the center and opposite sides of the outer periphery of the old pile. The pile portion above the cut portion is chucked with a chuck mechanism, and in this state the chuck mechanism is turned to twistingly sever the pile portion above the cut portion with the stress thus produced, and the separated pile portion is removed. The above sequence of operations is repeatedly performed to remove the entire old pile.