| 摘要 |
PROBLEM TO BE SOLVED: To provide a catch basin which can switch from one flow passage with a first outflow port to another flow passage with a second outflow port and prevent drainage from flowing to the first outflow port when the same flows out through the second outflow port.SOLUTION: A catch basin 20 comprises: a basin body 21 which is almost cylindrical in shape and has an inspection port 31, an inflow port 32, a first outflow port 33 and a second outflow port 34; a cover body 26 which is installed in the basin body 21 in a manner that can open and close the second outflow port 34 and can be switched between a first switching position A to close the second outflow port 34 and a second switching position B to open the second outflow port 34; and overflow prevention means 55 which is installed in the basin body 21 to block a drainage flow to the first outflow port 33 when the cover body 26 is switched to the second switching position B.SELECTED DRAWING: Figure 17 |
