| 摘要 |
PROBLEM TO BE SOLVED: To provide structure hardly degraded in underground infiltration capacity.SOLUTION: The structure 1a for temporarily storing drainage and infiltrating the drainage to the underground includes at least one first hollow structure 10a formed of concrete and having a sidewall 11a including permeable portions 13, and a second hollow impermeable structure 20 formed of concrete and disposed at the bottom of the structure 1a. When drainage containing mud or the like flows into the structure 1a, the mud is accumulated in the second structure 20, and the first permeable structure 10a and a permeable (infiltrating) crushed stone layer 92 at the outside can suppress plugging. |
