AUGER EXCAVATION STEEL-PIPE JACKING METHOD DAMAGINING NO BURIED ARTICLE

摘要

PROBLEM TO BE SOLVED: To obtain an end cutting edge for excavation which does not damage on obstruction such as a gas conduit in a ground even when the cutting edge is brought into contact with the obstruction during auger excavation steel-pipe jacking. ;SOLUTION: A female screw section 3 of a cutting edge made of rigid vinyl chloride is installed to the end male-screw section 4 of a propulsion pipe, and clamped and joined by a fixing bolt and a nut.;COPYRIGHT: (C)1999,JPO