METHOD FOR INSTALLING LONG GUIDE PIPE FROM BRANCH PART OF DUCT VIA BRANCH PIPE, AND LONG GUIDE MEMBER IN BRANCH PART

摘要

PROBLEM TO BE SOLVED: To install a guide pipe capable of smoothly inserting an optical communication cable 5 along a desired passage of a sewage pipe when the optical communication cable 5 is installed from a branch part of a main pipe 1 of the sewerage pipe via a branch pipe 3.;SOLUTION: The branch part 2 of a duct is provided with an annular flange part 29 and a guide pipe part 30, the guide pipe part 30 enters inside while bypassing along the inner circumference of the flange part 29 from the sideward direction of the inside surface side of the flange part 29, the flange part 29 is mounted to a guide member 28 forming a shape directing in the axial direction of the branch pipe 3 while drawing a spiral along the inside circle of the flange 29, and the tip of the guide pipe part 30 is connected to the guide pipe 6 inserted into the branch pipe 3.;COPYRIGHT: (C)2002,JPO