| 摘要 |
PURPOSE:To reduce an construction cost and to eliminate the possibility of repair after installation, by a method wherein, after the ground is excavated in the direction of the shoping ground to form a deep ditch, the interior of the deep ditch is filled with a water permeable material. CONSTITUTION:After a hole is bored in a slanted ground by the use of a casing, a high pressure water injection pipe is interposed in the hole and high pressure water is injected to form a deep ditch. Thereafter, the interior of the deep ditch is filled with gravel or a permeable material, such as synthetic resin impregnated for continuously producing bubbles after impregnation, to form a water permeable layer. When the permeable layer is positioned at an inclination to a horizontal plane, a hollow pipe, having opening through which water is collected, or a pipe having holes, which is filled with filament or fiber bundle made of hydrophilic synthetic resin cloth whereon a hydrophilic processing is applied, is interposed, and the open end thereof is hung down outwardly through the opening part of the deep ditch. |
