To cut off water at a damaged part of a waterproof layer by scattering a specified quantity of powdery and granular highly water-absorptive polymer between a sheet-form base material and a cover sheet and joining both sheets.
A highly water-absorptive polymer 13 of 200-3000 g/m2 is scattered on a nonwoven base material sheet 12 and the upper face thereof is covered with a nonwoven cover sheet 14. The fiber of the sheets 12, 14 is entangled together by a needle punch to closely attached to each other to constitute a water shielding sheet 11 loaded with a highly water-absorptive polymer powdery material 13. On applying this sheet, an impervious sheet, the water sealing sheet, and a waterproof sheet are laminated and laid in this order on a ground such as a storage hole in a waste disposal field or the like. When a through hole opens in the water proof sheet, the water shielding sheet 11, and the impervious sheet 11, the highly water-absorptive polymer 13 in the water shielding sheet 11 cuts off leakaging water and thereafter as the highly water-absorptive polymer 13 goes on swelling, water is cut off semipermanently. In this way, maintenance of the water shielding sheet is not required and water is securely cut off.
NAKAO AKIO
MATSUMOTO SHUICHI
KAMITOKU MAMORU
JIOTEKKUSU KK
IZUMI KK
| JPH04128410A | 1992-04-28 | |||
| JPH051408A | 1993-01-08 |