| 摘要 |
As a temporary drainage equipment, a penetration hole is formed to a floor slab of a building under construction, the penetration hole is provided with a substantially cylindrical funnel portion opened to a floor surface of a room, a connection pipe is communicated to a bottom portion of the funnel portion, and a hose guide pipe is inserted to the lower end portion of the connection pipe. An inner flange portion is provided to the lower end portion of the hose guide pipe so as to be flash with a ceiling surface of the downfloor room.
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