| 摘要 |
PROBLEM TO BE SOLVED: To provide fully-permeable rainwater storage facilities which enable rainwater from a ground surface to efficiently permeate for underground storage. SOLUTION: In the rainwater storage facilities 10, a plurality of hollow concrete block bodies 11, the wall surfaces of which each have an opening communicating with the outside and which can be vertically stacked, are horizontally and vertically arranged below the ground surface, so as to form a water storage space S under the ground. Side wall portions surrounding the water storage space S are composed of a cut-off wall 12; a bottom wall portion is composed of a gravel layer 13; a ceiling portion comprises a surface layer which is composed of porous concrete with intercommunicating porosities, and a base layer which is composed of polymer cement mortar formed with a through-hole; a portion for connecting the surface layer and the base layer together is formed in such a shape that the through-hole from the base layer communicates with the intercommunicating porosity of the surface layer in a portion facing the through-hole; and other portions are composed of a plurality of permeable lids 1 formed with a connected layer in which the polymer cement mortar of the base layer permeates through the intercommunicating porosities of the surface layer, so as to be integrated with them. COPYRIGHT: (C)2008,JPO&INPIT
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