| 摘要 |
A multiple collection pipe for underground water is provided to increase drainage efficiency of underground water by inserting underground water collection perforated pipes into a boring hole shortly and introducing water to the perforated pipes through hydrophilic rubber to a joint of the perforated pipes. A multiple collection pipe for underground water is formed by connecting plural perforated outer pipes(1) on a common central line(c) of a connection inner pipe(2), inserting hydrophilic rubber(3) to the outer circumference of the connection inner pipe, opening the other end of a non-perforated inner pipe(4) whose one end is inserted to the connection inner pipe at a certain distance(T) from an opening of the connection inner pipe of the downstream side, and forming a water collecting gap between the perforated outer pipe and the non-perforated inner pipe. |
