| 摘要 |
PROBLEM TO BE SOLVED: To provide a multilevel sewerage pipe capable of separately flowing rainwater and soil water with a simple structure.SOLUTION: A multilevel sewerage pipe 1 installs in an existing sewer pipe a soil pipe which has a smaller diameter than the existing sewer pipe. The sewer pipe is connected to a street inlet, to store rainwater for which water purification is not required, through a rainwater introduction pipe 40. The soil pipe is connected to a cesspit, to store soil water for which the water purification is required, through a soil water introduction pipe 42 penetrating through the sewer pipe. The soil pipe is arranged with a terminal point thereof positioned at a sewerage treatment plant. The sewer pipe is arranged with the terminal point thereof configured to discharge the rainwater transferred therethrough. |
