UNDERGROUND DOUBLE-WALLED PIPE AND PIPELINE HAVING THE UNDERGROUND DOUBLE-WALLED PIPE

摘要

PROBLEM TO BE SOLVED: To provide an underground double-walled pipe having excellent deformation capacity, which is not buckled even by a large bending stress without causing excess increase in cost.;SOLUTION: The underground double-walled pipe includes a metal made outer pipe 1, a metal made inner pipe 3 inserted into the inside of the outer pipe 1, and a filling material 5 consisting of a particle and/or particulate filling a gap between the inner pipe 3 and the outer pipe 1. When load is applied to the outer pipe 1, the inner pipe 3 and the filling material 5, and the filling material 5 and the outer pipe 1 are held in contact with each other, so that the filling material 5 successively and smoothly reallocates the stress transfer between the outer pipe 1 and the inner pipe 3.;COPYRIGHT: (C)2010,JPO&INPIT