| 摘要 |
PURPOSE:To provide an improved method of forming a water-impermeable layer film under the ground to thereby facilitate the storage of water such as rain water. CONSTITUTION:A plurality of protrusions 2, 2 are provided around a prescribed area 1, and an aqueous solution 3 of a polymer insolubilizable with ions in soil is sprinkled on the area surrounded by the protrusions 2, 2, and is permitted to penetrate spontaneously into the ground, thereby forming a water- impermeable layer film under the ground. Since, only by sprinkling the polymer solution and permitting it to penetrate spontaneously, a water-impermeable layer film can be formed under the ground and the workability is remarkably improved. Since the diffusion of the aqueous polymer solution into the outside is prevented, a perfect water-impermeable layer film can efficiently be obtained. |
