To provide a drain pipeline structure that can prevent sealing water breakage of a drain trap caused by the generation of negative pressure in a drain pipeline by suppressing the flow velocity or the like of drainage between a vertical drain pipe of the drain pipeline and a horizontal drain pipe on the lower reaches while dispensing with a vent pipe and an intake valve.
The drain pipeline structure is constituted such that a detour pipeline 6 through which drainage flowing down the vertical drain pipe 4 makes a detour so as not to flow directly into the horizontal drain pipe 5 on the lower reaches is provided between the vertical drain pipe 4 of the drain pipeline through which drainage from a drain facility 1 flows, and the horizontal drain pipe 5 on the lower reaches. The flow velocity and force of drainage in the detour pipeline 6 are suppressed to prevent blocking of the drain pipeline and generation of negative pressure to thereby prevent the sealing water breakage of the drain trap 1b of the drain facility 1. The drain pipeline structure may be constituted such that a detour pipeline through which a part of drainage flowing down the vertical drain pipe makes a detour is provided from a connection point between the vertical drain pipe 4 and the horizontal drain pipe 5 to an intermediate point of the horizontal drain pipe 5.
YOSHIDA KAZUMASA
ISHIKAWA NAOTO
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