| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize smooth running of a cable which curves gradually along the sharp curving line of a tunnel, when forming a joint portion by inserting an inserting port of a succeeding cable protection pipe to receiving port of a preceding cable protection pipe provided in the case of the cable protecting pipe provided with an inserting port at one end and a receiving port at the other end thereof. SOLUTION: One end portion of the protecting pipe body 1 is joined with an inserting port collar 2a via a rubber ring 4 for junction; the other end portion of the protective pipe body 1 is joined with a receiving port collar 3a via a rubber ring 8; the external diameter surface of the end portion of the receiving port collar 3a is joined with one end portion of the receiving port collar 3a; a rubber ring 15 for junction is provided to the internal diameter surface at the end portion of the receiving port collar 3b; and the cable protection pipe is bent at least at the distributed three points of the rubber rings 4, 8, 15 for junction.</p> |
