| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an underground buried multi-hole pipeline which is lightweight, excellent in execution workability, good in heat radiation, capable of being manufactured at a low cost, and free from any damages on a cable sheath. SOLUTION: The pipeline comprises pipes 11 for passing a cable and grooved blocks 13 having semi-circular grooves 12 across the pipes 11, the corrugated pipes 11 are formed of a plastic not containing any metal pieces, and the grooved blocks 13 are formed of a composite material with metal pieces mixed in the plastic.</p> |
