| 摘要 |
PROBLEM TO BE SOLVED: To provide a pit bottom part structure for easily cleaning/removing a solid material gathering in a water sealing trap part of a floor catch basin. SOLUTION: An upper end opening part 16a of a drain pipe 16 suspended from a pit bottom surface is positioned above the bottom surface, and the bottom surface forms a water storage part 3a on the periphery of the opening part. In that case, in a water sealing cap 17 composed of a top surface 17a positioned at an interval above the opening part and the peripheral edge 17c being suspended from the outer periphery of the top surface and having a lower part immersed in a half-opening shutter shape in the water storage part and at least three water gathering plates 18 having an upper edge part higher than the horizontal upper edge of the opening part or the lower end of an upper edge cutout part in a closely adjacent area of the opening part, the respective adjacent two sheets mutually form an angle less than 180 deg., and are respectively arranged and erected so that a height of the upper edge becomes a hight or more of the upper edge part over a basin inside surface from the opening part, and the respective ones have an object having a cutout slit for receiving the suspended peripheral edge of the water sealing cap.
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