RELAY WELDING METHOD FOR STEEL PIPE PILE AND SHEET PILE

摘要

PURPOSE:To eliminate the need for a stopper by the projection part and to secure the uniform gap of welding zones as well by fixing the backing ring providing plural projection parts which are directed for the outer side on the periphery with hanging them on the end face of the lower pile and by performing the main welding after the spot welding of the periphery of the groove with pinching of the projection part by the upper pile and lower pile. CONSTITUTION:A backing ring 1 is inserted from the bottom part to the inner face of the head part of the driven lower pile 5 of steel pipe and the hook 6 on several places which is made by working the ring itself is held by hanging on the pipe end of the head part. Then after the spot welding of the both sides of the hook 6 on the end face of the lower pile the tip of the upper pile 4 is inserted by utilizing the taper part 8 of the ring 1 to pinch the hook 6. A fixed gap is thus secured on the periphery of the pipe end. The main welding is then performed by fixing the upper pile 4 with the spot welding of the gap part at certain intervals.