| 摘要 |
PROBLEM TO BE SOLVED: To provide a method easily producing an article comprising concrete which uses shells of oyster as aggregates. SOLUTION: This method produces a hollow cylindrical inside body 2. A porous box is mounted on the periphery of the inside body 2, shells 4 is filled as the aggregate between the box and the inside body 2, and then concrete paste P is sprayed to form an outer cylindrical body 3. The outer cylindrical body 3 covers the periphery of the inside body 2 and integrated with the inside body 2 to form a hollow article 1. A complicated corrugated part 6 is formed on the surface of the article 1 by the shells 4, and seaweeds adhere and polychaeta, small Crustacea family or the like proliferate in cavities formed between spaces of the shells 4, and useful fishes prey on them effectively gather around the molded article 1.
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