Subterranean pulling included construction method null of embedding

摘要

PURPOSE: To accomplish an underground lead-in method for a buried pipe by which trouble such as breakage or the like in a drill pipe can be prevented in an installing method for a buried pipe with a large diameter while expanding the diameter of a small bore previously excavated. ;CONSTITUTION: A buried pipe underground lead-in device consisting of a bore expanding device 3, a rotary swivel device 5, a lead-in jack device provided in the front end part of a buried pipe 10, and a bore wall protecting pipe 12 arranged so as to cover the buried pipe 10 is connected to the rear end of a drill pipe 2 inserted into the previously excavated small diameter bore 1, and tensile force and rotational force are simultaneously applied to the drill pipe 2 by means of an excavating device arranged in the front end of the drill pipe 2, and then, a bore expanding process, in which the buried pipe 10 front part, is expanded to the predetermined length, is carried out while the bore expanding device is rotated. Subsequently, the lead-in jack device 9 is operated by employing the drill pipe 2 as reaction force, and the buried pipe is led into the ground while the buried pipe lead-in process for leading in the buried pipe 10 without any rotation by one stroke is repeated alternately.;COPYRIGHT: (C)1995,JPO