| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate such a laying that undue leading-in in which cables are pulled by allowable tension or higher, in laying the cable by the lead-in, in conditions that the cable are extended in a main pipe, or through the main pipe or a lead-in pipe. SOLUTION: When cables are laid by leading-in conditions such that the cables are extended in a main pipe, or through the main pipe or a lead-in pipe, laying is conducted under prior verification that laying tension obtained by the laying condition of the main pipe, the number of conductors of the cable or their logarithm, and a pipe diameter ratio of the diameter of a circumscribed circle of a bundle, which the cables extending in the main pipe are tied in a bundle with respect to the inside diameter of the main pipe, is lower than the allowable tension of the cable.</p> |
