| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive roadbed block for a rooftop, easy to construct, and lightened so as to reduce labor of landing up to a rooftop. SOLUTION: This roadbed block 10 for a rooftop is made of styrene foam of an expansion ratio of 50 times. The roadbed block has water storage holes 11 formed at a prescribed interval in 3 stages and 3 rows on the upper surface, communicating holes 12 for communicating the water storage holes 11 with each other, formed on the lower end part of the water storage hole 11, and cylindrical engagement recessed parts 14 for connecting the roadbed blocks 10 adjacent to each other, formed on the corner part of the lower surface. Four roadbed blocks 10 are unitedly connected with each other by engaging the engagement projecting parts 42 of connecting members 40 with the engagement recessed parts 14 of the four roadbed blocks 10 adjacent to each other. COPYRIGHT: (C)2007,JPO&INPIT
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