| 摘要 |
PURPOSE: A structure of a protective pipe for underground transmission capable of being easily attached and detached and preventing breakage of a cable due to ground subsidence is provided to prevent breakage of a cable by having a dual structure of an inner protection pipe and an external protection tube and including an elastic bar between the inner protection pipe and the external protection tube. CONSTITUTION: An inner protection pipe(120) is fixed by first pivot axis when a bottom portion is crossly touched to insert a cable from the top. The top end of the inner protection pipe is rotated in an opposite direction. An elastic bar(123) is placed on a plurality of insertion holes(125) which is formed to be symmetric. An external protecting tube(130) is rotated in a facing opposite side by a second pivot axis. |
