Composite drain to be used in soil types having low water premeability |
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| 申请号 | US3765783D | 申请日 | 1971-07-06 | 公开(公告)号 | US3765783A | 公开(公告)日 | 1973-10-16 |
| 申请人 | PERSTORP AB; OREBRO PAPPERSBRUKS AB; | 发明人 | WAGER O; | ||||
| 摘要 | Embankments for roads, railways etc are made by using material having low water permeability, such as clay. The material is laid up in different layers, which are separated from each other by means of horizontally arranged strips of drains. The drains comprise an inner core having wave-shaped surfaces and outer sheets of water filtering material, so that water from the clay may go through the outer sheets into the space between the inner core and the outer sheets and flow out. | ||||||
| 权利要求 | 1. A composite drain to be used in soil types having low water permeability, characterized in that it consists essentially of an inner core of water-impermeable material having wave-shaped surfaces and that the corE on at least one surface is combined with a filtrating, water-permeable, sheetlike material, which maintains drainage channels formed between the core and the sheetlike material, said sheetlike material permitting the passage of water but preventing the passage of soil particles therethrough. 2. A composite drain according to claim 1, characterized in that the core comprises a strip-shaped, elongated material having wave-shaped surfaces on both sides. 3. A composite drain according to claim 1, characterized in that the core comprises a strip-shaped, elongated plastics material having wave-shaped surfaces on both sides, which both sides are combined with paper. |
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| 说明书全文 | |||||||
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