| 摘要 |
PROBLEM TO BE SOLVED: To provide a pit capable of restraining a crack from appearing in concrete slab on grade. SOLUTION: This pit is equipped with an approximately-tubular pit body 13 in which a bottom portion is formed, and a lid member 17 for closing an opening 15 formed on the top surface of the pit body. The pit body is formed of a viscoelastic body, and an elastic portion 51 is formed in a flange 31 which is formed at the peripheral edge of the opening of the pit body. COPYRIGHT: (C)2009,JPO&INPIT
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