| 摘要 |
<p>[PROBLEMS] To facilitate cleaning and its management. [MEANS FOR SOLVING PROBLEMS] A pit (20) for managing dust removal comprises a bottomed upper pi t (22) connected with an inflow pipe (20a), and a tubular lower vertical pit (23) having a upper portion connected with the upper pit and supplying wate r trickling from an opening at the upper end to a water storage tank (10). U pper end of the lower vertical pit penetrates the bottom wall (22a) of the u pper pit, the circumferential wall (22b) of the upper pit surrounds the uppe r end of the lower vertical pit and a circumferential groove (33) for precip itating solid matters contained in the water is formed between the periphery of the upper end and the circumferential wall of the lower vertical pit. A mesh plate (34) for filtering the water arriving at the circumferential wall is provided in the upper pit. One end of a drain pipe (36) having the other end coupled with a sewer pipe is coupled with the circumferential groove an d a regulation valve (38) is provided in the drain pipe. The bottom face of the circumferential groove is formed to incline relative to the horizontal s urface such that the side coupled with the drain pipe is made lower and wate r in the circumferential groove flows into the drain pipe, and the inner sur face of the circumferential groove is formed tobend or incline such that the inside width of the circumferential wall decreases from the inflow pipe sid e toward the drain pipe side.</p> |
