| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a U-shaped concrete block of high strength with side slabs erected on both sides of a bottom slab. Ž<P>SOLUTION: A hole 5 is provided penetrating the bottom slab 2. The hole 5 is shaped to reduce its width dimension on the side slab side to enlarge the cross-sectional area of the bottom slab, and a hole inner peripheral surface 8 is slightly inclined. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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