To reduce saggings of a cable protecting tube which are generated between supporters, when the cable protect tube is laid, being supported with supporters set at appropriate intervals.
A cable-protecting tube 10 is obtained, by attaching a tension member 14 vertically to the outside of a plastic body 12 of a cable-protecting tube, putting a plastic casing 16 on its outside and integrating the cable- protecting tube body and the tension member a body. This protective tube 10 is laid, being supported, in such a way as to be movable in the longitudinal direction, with supporters 40 being fitted to the top part of a sewerage pipe 36 at appropriate intervals inside the pipe 36, and tension member anchors being fixed to both end sides of the sewerage pipe 36. By using these anchors, the tension member 14 of the protecting tube 10 is anchored with a tension applied to the tension member. Consequently, saggings of the cable protecting tube are reduced, and an optical fiber cable can be tracted in without hindrance.
YAMAMOTO SHUNJI
SHIINO KOTA
OSHIMA KOSAKU
ICHIKAWA SHIGEYUKI
