| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor-slab drainage system, in which a section from a drainage surface to a water-plumbing is formed in an integral structure, from which water is not exuded, in which a drainage cross section can be ensured largely and a water collecting vessel ensures the quantity of water corresponding to a drain pipe, which also has light weight, the cost of which is also reduced and which is economical and does not damage appearance. SOLUTION: The drain pipe 2 having the water collecting vessel 1 in an upper section is disposed in upright into a floor slab 10, and the lower end of the drain pipe 2 is formed so as to be projected into a throating space formed to the underside B of the floor slab 10.
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