| 摘要 |
PROBLEM TO BE SOLVED: To provide a cleaning method for a drain pipe that spreads a small amount of chemical readily and uniformly over an entire inner peripheral surface of a drain pipe of a toilet bowl, thereby effectively removing urinary calculus.SOLUTION: A cleaning method is for a drain pipe 20 that drains sewage from a toilet bowl 10 installed on each floor by leading the sewage to a horizontal pipe 21, and from the horizontal pipe 21 to a vertical main pipe 23. The cleaning method comprises: a urinary calculus softening step in which a chemical spraying nozzle of chemical injection means is inserted from a cleaning port 27 provided in the vertical main pipe 23, for spraying a urinary calculus softening agent from each of injection ports onto urinary calculus adhered on an inner wall surface of the vertical main pipe 23, thereby softening the urinary calculus; a neutralization step in which a neutralizing agent is injected into the vertical main pipe 23 for neutralizing the urinary calculus softening agent; and a high-pressure water cleaning step in which a high-pressure water injection nozzle of high-pressure water supply means is inserted from the cleaning port 27 provided in the vertical main pipe 23 for spraying high-pressure water and cleaning the inner wall surface of the vertical main pipe 23, thus removing the softened urinary calculus. The horizontal pipe 21 is cleaned in the same way.SELECTED DRAWING: Figure 1 |
