THE REVIVAL METHOD WHICH UNION LAYS THE NEW WATERWORKS STEEL PIPE ON THE WATERWORKS STEEL PIPE INSIDE WHICH IS BEEN OLD

摘要

A method for bonding a new steel pipe for pipeline supply inside an old steel pipe for pipeline supply is provided to link two new steel pipes to each other easily by interposing a joint member with an uneven portion therebetween. A method for bonding a new steel pipe(100) for pipeline supply inside an old steel pipe(10) for pipeline supply includes the steps of: preparing the new steel pipe, and conveying the new steel pipe to the obsolete point in the old steel pipe, and welding the new steel pipe to an inner wall(11) of the old steel pipe; welding a joint member(300) to one end(120) of the new steel pipe through a fixing jig(320) wherein an uneven part of the joint protrudes out of the new steel pipe, and welding another new steel pipe(100') to the uneven part of the joint; and removing the joint after welding two new steel pipes.