| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily and inexpensively construct a ground drainage structure even when constituted in this way, by preventing fragility of an impervious area when water is gathered, by further surely preventing the water from permeating from an external area of its external part into the impervious area tried to be impervious in the ground such as banking. Ž<P>SOLUTION: A vertical directional drain material 19 extending in the vertical direction is arranged by being embedded between the impervious area 18 tried to be impervious in the ground 1 and the external area 18 adjacent in the horizontal direction to this impervious area 17. Water W flowing in the ground toward the impervious area 17 from the external area 18, flows down by being collected inside the vertical directional drain material 19, and the water W is drained toward the external part of the impervious area 17. The other vertical directional drain materials 21 and 22 are arranged in the same constitution as the vertical directional drain material 19. At least a part of the impervious area 17 is surrounded by the respective vertical directional drain materials 19, 21 and 22 in a plan view of the ground 1. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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