| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily classify a resin pipe and a metal pipe for disposal in a pole with the metal pipe inserted in the resin pipe, hardly crushed when an automobile or the like collides and easily repaired. <P>SOLUTION: A corrugated pipe 6 of corrugated cross section made of metal is inserted in the resin pipe 5, and the outer peripheral surface 7 of the corrugated pipe 6 presses the inner peripheral surface of the resin pipe 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
