| 摘要 |
PROBLEM TO BE SOLVED: To extremely facilitate transport and movement and reduce construction cost because of lightening and easy disassembly, to increase the degree of freedom of deformation and to recycle waste plastics. SOLUTION: An opening is formed to one end face 21A of the main body 21 of a unit block 2 and the main body 21 is formed in a box-shaped body. A projection 22 is formed to the other end face 21B of the main body 21, and the projection 22 is formed in a shape mutually fitted to the opening 21A exactly.
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