METHOD OF CLEANING INVERTED SIPHON STRUCTURE OF SEWER

PROBLEM TO BE SOLVED: To clean the inner wall surface of an inverted siphon crossing pipe without having a worker get in the pipe. SOLUTION: This inverted siphon structure of a sewer includes an upstream side inverted siphon chamber 11 and a downstream side inverted siphon chamber 12 which are connected to an upstream side water channel 1 and a downstream side water channel 2 which are disposed on both sides of an obstacle 3 and which further extend downward than the obstacle and the inverted siphon crossing pipe 13 which connects the bottom ends of the upstream side inverted siphon chamber and the downstream side inverted siphon chamber to each other on the lower side of the obstacle. A large number of floating bodies F are floated on the surface of the water in the inverted siphon crossing pipe, and moved while being retained in the inverted siphon crossing pipe to rub the floating bodies against the inner wall surface of the inverted siphon crossing pipe. Consequently, the dirt adhered to the inner wall surface of the inverted siphon crossing pipe can be removed. COPYRIGHT: (C)2010,JPO&INPIT