| 摘要 |
PURPOSE:To prevent the breakage of sloped ground by a method in which a cylindrical culvert is formed, the upper half of the cylinder is made into a water-permeable layer, the lower half of the cylinder is made into a water-impermeable layer, and a water collection inlet is formed in the joints of slope frame blocks. CONSTITUTION:Joints 1 of equilateral trianglar column form with right angle on its top are projectionally formed integrally on both end sides of a long square cylinder. The upper half of the square cylinder is made into a water-permeable layer 3 composed of gravels in such a way as to form a round waterway 2 in the inside of the square cylinder, and the lower half is made into a water-impermeable layer 4 composed of concrete. Then, a groove 5 through which ground water flows down is formed on the upside of the water-permeable layer 3, a concaved portion 11 on which a lifting metal is hung down is formed on the side lower part of the longitudinal portion of the square cylinder, and a concaved line 12 at which concrete is integrally combined with the square cylinder is formed on the lower parts of both ends of the square cylinder. Rain water flows from the water-permeable layer 3 into the waterway 2, collected in the water collection inlet 8, flows down to the lower waterway, and goes to a drain ditch. |
