METHOD OF LAYING SIGNAL WIRE COVERED WITH SOFT MATERIAL IN PIPE

PURPOSE:To get a laying method which does not damage a signal wire when laying a signal wire covered with a soft material in a pipe. CONSTITUTION:A signal line a is laid inside a pipe 1 by pulling the signal line a into a coil 10, and inserting this coil 10, making use of an inserter 12, and withdrawing only the coil 10. Hereby, the signal wire a is never damaged by burrs since it is protected with the coil 10 at insertion. As a result, since the signal wire covered with ordinary synthetic resin or the like can be used, the cost of the signal wire is low, and also since the resistance in insertion is small, the insertion work is very easy.