| 摘要 |
PROBLEM TO BE SOLVED: To provide a drain pipe which can enhance drain efficiency in a prescribed occupied space, a communication pipe, and a laying method of the communication pipe. ! SOLUTION: In drain pipes 100, 200 and 300, external peripheral faces are formed into linear cylindrical shapes. Internal peripheral faces of the drain pipes 100, 200 and 300 are formed continuous to one another. The drain pipes include portions at which axial cores GC of the internal peripheral faces of the drain pipes 100, 200 and 300 do not coincide with one another with respect to axial cores of the external peripheral faces of the drain pipes 100, 200 and 300. The non-coincident portions are center parts of the drain pipes in axial directions. Communication pipes 500, 600 and 700 can be formed by continuously arranging the drain pipes 100, 200 and 300. ! COPYRIGHT: (C)2015,JPO&INPIT |
