| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely prevent conjuncture of a cable to be laid additionally around an already-laid cable, in a multiple cable laying method for laying a cable newly additionally into a conduit in which a cable has been laid already. SOLUTION: To the tip of a rod 4, a cable inserting device 3 provided with a first roller 32 which moves rotating on the internal wall of a conduit, a second roller 33 which moves rotating on an already-laid cable, and a CCD camera 51 are fitted. The rod 4 is inserted into a conduit preventing its conjuncture around the already-laid cable, observing the inside state of the conduit by the CCD camera 51.</p> |
