| 摘要 |
PROBLEM TO BE SOLVED: To provide a piping system which can adapt to climate change of recent years, and which can adapt to accumulation of polluted sludge, sand, and the like in a dry season and a heavy rainfall in a rainy season.SOLUTION: In the case where a drainage ditch is provided in any one of eastward, westward, southward, and northward directions of a piping work site, two or more exhaust ports are constantly secured, and a piping diameter is set 1.5-2 times larger than a conventional piping diameter. Thus, in-piping cleaning can be easily performed without receiving help from a vendor, and the difficulty of drainage is not caused during a heavy rainfall. |
