BURIED PIPE FOR OPTICAL COMMUNICATION CABLE

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive buried pipe for optical communication cable wherein additional installation space for inserting new inner pipes are secured in a corrugated pipe and the inner pipes are inserted and held in the corrugated pipe. SOLUTION: At least three inner pipes 3 are placed contiguously and continuously inside a polyethylene corrugated pipe 2 in such a way that the inner pipes 3 on the two ends are not adjoining. Each of the inner pipes 3 is in contact with the inside perimeter of the corrugated pipe 2 and is held to the corrugated pipe 2 at the point of contact. In this way, additional installation space S is secured inside the corrugated pipe 2 close to the inner tubes 3 on the two ends, in which inner pipes 3 may be inserted in the future.