| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a prerotation tank and a sewage water pump device, which are easily carried into a manhole and are capable of preventing retention of air at a bottom part. <P>SOLUTION: A prerotation tank 10 of a sewage water pump device 100 installed inside a manhole 200 includes: an edge part 20 along an inner peripheral shape of the manhole 200; a shallow part 21 provided on a position lower than the edge part 20 and formed by a plane continued with the edge part 20 by an inclined plane; a deep part 22 whose bottom surface is provided on a position lower than the shallow part 21; an inclined part 23 continuing the shallow part 21 and the deep part 22 by the inclined plane; a first member 31 where a part of the edge part 20, a part of the shallow part 21, the deep part 22 and a part of the inclined part 23 are integrally molded; a second member 32 where the other part of the edge part 20, the other part of the shallow part 21 and the other part of the inclined part 23 are integrally molded and combined with the first member 31 to integrally form the edge part 20, the shallow part 21 and the inclined part 23; and flange parts 33 and 36 provided on the first member 31 and the second member 32 respectively and abutted to each other. <P>COPYRIGHT: (C)2013,JPO&INPIT |
