| 摘要 |
PROBLEM TO BE SOLVED: To provide an underground water draining device, a connecting pipe and a method for draining underground water, enabling to reduce cost and to improve strength of an outer pipe. SOLUTION: The device is provided with a perforated pipe 11 having water passage holes 21 and a pipe 12 without holes on its side. The connecting pipe 14 has a passage groove 22 communicating with both ends. The periphery of the connecting pipe 14 is covered by the perforated pipe 11 and the pipe 12 without holes while the perforated pipe 11 and the pipe 12 without holes are connected in tandem. An inner pipe 15 having a space 25 for water to pass through between the perforated pipe 11 and the pipe 12 without holes, is provided inside the perforated pipe 11 or the pipe 12 without holes. The inner pipe 15 is connected to the inner periphery of the joint pipe 14 while the lowest end 15a of the inner pipe has an absorption hole 26 at the side of the tip end part. The perforated pipe 11 is placed at the height of a sand layer 1 under the ground and the pipe 12 without holes is placed at the height of a silt layer 2 under the ground to be driven into a hole 3 in the ground, so as to drain the underground water by pumping water up with a pump 18 through the inner part 30 of the inner pipe 15. COPYRIGHT: (C)2006,JPO&NCIPI
|
