| 摘要 |
PROBLEM TO BE SOLVED: To provide a rainwater storage structure having a ground permeation function capable of saving the labor in a construction method and reducing the cost, effectively using a storage space, adding the permeation function corresponding to any optional underground water level in the rain water storage structure, and having the functions of the flood regulation and water utilization of the stored rainwater. SOLUTION: A rainwater storage space 6 is formed of a sidewall 3 formed by placing a hollow circular tube 2 in the ground adjacent thereto in the horizontal direction, and an upper floor slab 4 and a lower floor slab 5, and an intermediate pillar 7 consisting of the hollow circular tube is erected. A part of the hollow circular tube groups 2, etc. form a hollow circular tube 2A for flowing rainwater in which rainwater from the outside flows out in the rainwater storage space 6 through the tube. The other part of the hollow circular tube groups 2, etc. form a hollow circular tube 2B for ground penetration in which a ground penetration hole 13 with rainwater in the rainwater storage space 6 is discharged into the ground through the tube by providing a non-return valve 12 for permitting only the flow-out to the ground in a tubular wall part placed while extending in a deep layer side ground over the lower floor slab 5. COPYRIGHT: (C)2010,JPO&INPIT
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