| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable the laying of a cable at tow cost without needing snaking work. SOLUTION: In a power cable laid within a tunnel, many two-piece rings 5 which have enough space for the cable accommodated in a tunnel to transform like a snake are arranged at proper intervals in the longitudinal direction of a path, and a cable 5 is accommodated in the rings 5 without presnaking. A disaster preventive trough 7 is supported with the two-piece rings 5, and the cable 6 is housed in the disaster preventive trough 7 without presnaking. Furthermore, snakes for trigger, which become the starting points where snaking occurs continuously are provided at the proper places in the block after laying of a cable.</p> |
