| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a corrugate tube that does not give rise to a land sinking phenomenon even when rain falls onto or vibration is applied to the road surface under which the corrugated tube is buried and covered with soil, and has favorable pressure withstanding characteristics and flexibility favorable to the insertion of multiple cables. <P>SOLUTION: The corrugate tube is formed of a corrugated rectangular outer tube in which projections having rectangular cross sections and recesses having rectangular cross sections are alternately disposed in the direction of length, and of at least one cylindrical inner tube in contact with the inner surfaces of the recesses of the corrugated rectangular outer tube. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
