| 摘要 |
PROBLEM TO BE SOLVED: To provide a joined type hollow black for cleaning water capable of keeping a cleaning function over a long period of time. SOLUTION: The joined type hollow block is equipped with block elements 11 and 12, which have a three-dimensional structure, molded from porous concrete. A plurality of the block elements 11 and 12 are combined to constitute a block main body 10 having a hollow structure and the block main body 10 in the constituted state has an opening part 13 for allowing the inside and outside of the hollow structure to communicate with each other. Joining parts 15 and 16 are provided so as to be used when the block main body 10 is constituted by combining the block elements 11 and 12 or the block elements and the block main bodies are joined by a plurality of joining members 25. COPYRIGHT: (C)2004,JPO
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