To improve an enforcement property and also reduce a cost by installing a support member for supporting the sheath pipe of an optical fiber inside the pipe top of a buried pipeline having a passage passing a water and a passage the optical fiber in common.
A buried pipeline 10 buried in the ground for passing a sewer and optical fiber has a buried pipe 12 formed on an eggy section shape by the extrusion molding of a synthetic resin of vinyl chrolide and a support member 14 for sheath pipe is installed inside the pipe top of this buried pipe 12. This support member 14 is continuously formed along the longitudinal direction of the buried pipe 12 by the extrusion molding of the synthetic resin of vinyl chrolide and a space for passing the sheath pipe 16 of the optical fiber is formed inside the support member 14. The upper outer surface of the support, member 14 is bent along the inside of the pipe top of the buried pipe 12 and this bent outer surface is adhered to the inner surface of the pipe top of the buried pipe 12. Thereby, the support member 14 can be installed simply in the buried pipe 12 by the adhesion.
MAEDA MASAHIRO
MOTO YASUO
MORIOKA SHINICHI
TAKAHASHI MASANORI
HAZAMA YUJI
SHINOZAKI HARUHIKO
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