PROTECTION PIPE AND CONDUIT FOR COMMUNICATION WIRE IN SEWER PIPE, AND CONSTRUCTION METHOD OF COMMUNICATION CHANNEL IN SEWER PIPE

摘要

PROBLEM TO BE SOLVED: To erect a communication channel by laying a conduit for communication wire while utilizing a sewer pipe. SOLUTION: A rail 1 in an extending direction is previously fixed over an upper wall surface 5 of a sewer body pipe 4 and a child guide cord is descended toward the sewer body pipe 4 from each home through a mounting pipe 15. The child guide cord is connected to a parent guide cord inserted into the sewer body pipe 4 and this master guide cord is drawn out to take out the slave guide cord. The respective child guide cord is taken-in from a drawing out hole 13 of a protection pipe 7 corresponding to a position, corresponding to the sewer body pipe 4, of the mounting pipe 15 in which each child guide cord is descended and the protection pipe 7 is inserted while it is engaged with the rail 1 to constitute a conduit 2. A communication channel in which an optical fiber cable 6 is inserted into the conduit 2 and the mounting pipe 15 is finally erected by drawing the child guide cord to which the optical fiber cable 6 is connected.