Ductile cast iron pipe jacking method

摘要

PROBLEM TO BE SOLVED: To prevent a corrosionproof layer from being broken by transmission of propulsive force and simplify structure of a ductile cast iron pipe for a jacking method. ;SOLUTION: A flange 3 is provided at a rear end 2A of a spigot 2 of a normal ductile pipe 1 with one end formed as the spigot 2 and with the other end formed as a socket 7 for receiving the spigot 2. Axial ribs 10...10 are laid every appropriate space in the circumferential direction between the flange 3 and a rear face 7C of the socket 7, and an outer surface mortar layer 6 is provided between the rear face 7C of the socket 7 and the flange 3 in such a state as to embed the axial ribs 10...10.;COPYRIGHT: (C)1999,JPO