UNDERGROUND PIPE STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an underground pipe structure preventing damage and breakage due to growth of plant root from new installation to a time after long period time passes. SOLUTION: A sheet body 3 having a base material 1 ejecting ion or composition which the plant root 4 evades is equally added on a surface thereof is fixed and integrated on whole circumference of an inner wall 50 of the underground pipe. COPYRIGHT: (C)2006,JPO&NCIPI