| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the workability of leading a cable protective pipe into an external pipe and removing a net from the cable protective pipe. SOLUTION: A lead-in method is the one that leads the cable protective pipe 3 into the external pipe 2 buried in the ground between pits 1, 1. The metal net 5, which has an outwardly protruded grip 4 at a position located toward the other end of the cable protective pipe 3 from one end thereof by a shrinkable length of the cable protective 3 that is taken into account right after lead-in work, is rounded into a cylindrical shape and mounted at one end side of the cable protective pipe 3 by joining edges of the net 5 with a rope made of natural fibers or synthetic fibers. The grip 4 is connected to one end of a lead-in wire 7 laid in advance in the external pipe 2 all over the length of the pipe, and the other end of the lead-in wire 7 protruded from the other end side of the external pipe 2 in the other pit 1 side is pulled, thus enabling to lead in the cable protective pipe 3.</p> |
