PROBLEM TO BE SOLVED: To make it possible to fully demonstrate the drainage function and the adhesion strength with the ground.;SOLUTION: A drainage pipe 10, at least a tip of which is inserted into the ground, comprises a drainage hole 13 opening in a side wall portion 12 of a main body 11, a recessed portion 14 formed in the side wall portion 12, and an inflatable bag body accommodated in the recessed portion 14. The bag body is accommodated in the recessed portion 14 so as not to project outward from an outer surface of the side wall portion 12 in the initial state.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT
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