| 摘要 |
To facilitate cleaning and to facilitate management thereof, a dust-removal managing pit is provided with an upper pit having a bottom and to which an inflow pipe is connected and a cylindrical lower vertical pit having its upper part connected to the upper pit for supplying water flowing down from an upper-end opening portion to a water storage tank. The upper end of the lower vertical pit is provided penetrating a bottom wall of the upper pit, while a peripheral wall of the upper pit is provided so as to surround the upper end of the lower vertical pit, and a peripheral groove for precipitating solid substances contained in water is formed between the periphery of the upper end of the lower vertical pit and the peripheral wall. A mesh plate constituted capable of filtering water leading to the peripheral groove is provided on the upper pit. One end of a drain pipe with the other end connected to a sewer pipe is connected to the peripheral wall, and an adjusting valve is provided in the drain pipe. A bottom face of the peripheral wall is formed with inclination with respect to a horizontal plane by lowering the side to which the drain pipe is connected so that the water in the peripheral groove flows into the drain pipe, and an inner face of the peripheral wall is formed with curvature or inclination so that a width of the inside of the peripheral wall from the inflow pipe side toward the drain pipe side is decreased.
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