| 摘要 |
<p>PROBLEM TO BE SOLVED: To increase a distance for pushing in a wire leading rod. SOLUTION: This wire leading rod 11 is formed by rigidly-connecting a plurality of short rods 12 with rigidity in series so as to be detachable. When the leading-wire rod 11 is led in a conduit line 2 in which a cable 1 has been laid, a front end head 10 is fitted onto the front end of the first short rod 12 and is pushed in, and the other short rods 12 are pushed in sequentially while they are being connected with each other. The rigidity of the leading-wire rod 11 is high, which is formed by rigidly-connecting the short rods 12 with high rigidity, therefore, large pushing effort can be worked, so that the pushing-in distance of the leading-wire rod 11 can be increased. The rigidity of the leading-wire rod 11 is high enough not to cause deflection in a waveform when pushed-in. Consequently, pushing-in force generated when some deflection occurs in the waveform is not dispersed. It is thus possible to act great pushing-in force and attain a long pushing-in distance.</p> |
