| 摘要 |
PURPOSE:To shorten the construction period of slope protection blocks as well as to make the slope protection work easier by using an integrally formed block whose plane is of square or rectangular form and having a cylindrical cavity penetrating through its central part thicknesswise. CONSTITUTION:A block 1 having a cylindrical cavity in its central part is integrally formed by utilizing centrifugal force, having angled or beveled faces at X- and Y-positions. The block 1 also has projections as countermeasures against rain water on its surface. The homogeneous concrete blocks capable of well draining rain water and also of preventing slipping-down and containing usual reinforcing bars inside can be obtained.
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