| 摘要 |
PURPOSE:To increase the efficiency of drainage of water in back-filling soil, by a method wherein the one end of a water permeable sheet group is secured to the back of a concrete retaining wall, and banking is laid between the sheets at the back of the retaining wall to form a back-filling layer. CONSTITUTION:An abutment 2 made of concrete is built on foundation piles 3, and drainage parts 4, through which water in soil is drained, are previously formed in the abutment 2. Banking Go is laid on the lowermost part of the back of the abutment 2, and a water permeable sheet 1 is laid on banking Go. A banking layer is formed, in the order of the water permeabhle sheet 11 and the banking G, at the back of the abutment 2 in a condition that the water permeable sheet 11 is located between the back of the abutment 2 and the banking. Further, the different back water permeable sheet 11 is coupled to a drainage part 2. This enables dissipation of an excessive gap water pressure in back-filling soil, and decerase of an earth pressure. |
