LEADING PIPE AND PIPING METHOD OF THE LEADING PIPE

摘要

PROBLEM TO BE SOLVED: To provide a novel leading pipe and a piping method of the leading pipe that can be pressed in even when abutting on an obstacle in a process of being pressed into the ground.;SOLUTION: The leading pipe piped underground prior to a process of installing a buried pipe underground by an underground jacking device comprises an outer pipe 2 formed in cylindrical shape and gradually added to the rear end; an inner pipe 3 formed in cylindrical shape, turnably inserted in the outer pipe 2 and gradually added to the rear end; and an excavating head 4 detachably disposed at the tip of the inner pipe 3 and provided at its tip with excavating bits 16 located ahead of the tip of the outer pipe 2.;COPYRIGHT: (C)2007,JPO&INPIT