CENTER PUSHING PIPING METHOD

PROBLEM TO BE SOLVED: To execute a center pushing piping method in a propulsion method of a conduit with a simple structure. SOLUTION: The conduit in which a plurality of pipes are connected is propelled and installed by providing a propulsive force to a rear-most-end pipe and sequentially transmitting the propulsive force from rear side pipes to front side pipes. A space is formed by connecting a first pipe body 17 to a pipe 12 which is adjacent in front-back direction at a front side from the rear-most-end pipe, connecting a second pipe body 18 to the other pipe 12 and providing both tip end parts of the first pipe body 17 and the second pipe body 18 with a distance between them in a pipe axis direction. A jack device 24 is provided in the space and the pipe 12 at a front side from the jack device 24 is provided with a propulsion force and propelled. After propulsion, the jack device 24 is removed and then a conduit 12 behind the jack device 24 is propelled to move the second pipe body 18 close to the first pipe body 17 and these first pipe body 17 and the second pipe body 18 are mutually joined. COPYRIGHT: (C)2008,JPO&INPIT