| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To realize shortening a working time and reduction in working cost due to the reduction of used materials, by reducing the number of extension ropes to be replaced whose working has been executed in a plurality of steps. <P>SOLUTION: The method of stretching extension ropes is used to stretch extension ropes 4 for stringing electric wires between power transmission pylons 2, in advance. The method has a step of attaching extension rope forwarding devices 12, each having a pair of rollers 8 rotating by power of a motor 6 on each of the power transmission pylons; a step of sandwiching the extension rope between the rollers rotating in a reverse direction each other; a step of rotating the rollers of adjacent extension rope forwarding devices synchronously to each other, in a state where the extension ropes are each sandwiched between the rollers; and a step of thereby stepwise replacing the extension, i.e. weak first ropes 4a by a strong second extension ropes 4b and a third 4c through n-th 4n ropes. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
