| 摘要 |
PROBLEM TO BE SOLVED: To remove dirt on a bottom of a crossing pipe and a wall of the pipe in a sewage system by stretching over a wire which connects a spherical body between manholes in the downstream and the upstream and moving the spherical body forcedly by a winch by repeating it from the downstream side to the upstream side. SOLUTION: First, solid filth 4 on a bottom of a manhole in the downstream 15 is discharged by a clamshell 19. Next, a wire 11 which connects a hollow spherical body 7 is stretched over between manhole in the upstream and the downstream 13 and 15 to arrange the spherical body 7 on a bottom 5a of a crossing pipe 5. The spherical body 7 is wound up by winches 17, 18 from a start point A to an end point B. An inside diameter of the crossing pipe 5 is reduced by the spherical body 7, water pressure and flow speed of sewage water 25 are increased, and an eddy current is generated in the vicinity of the spherical body 7 to remove oily filth 27 adhered on a wall of the pipe and solid filth 4 adhered on the pipe bottom 5a. After this work is repeated twice or three times, the spherical body 7 is arranged on an upper wall 5b and is moved forcedly from C point to D point to remove the oily filth 27 on the wall face of the pipe. The solid filth 4 and the oily filth 27 which are removed are discharged by a clamshell 19. |
