Ground drainage system - uses water-guiding layer comprising strips of drainage sheet

摘要

The system drains water-bearing ground by inserting drainage components in it and placing a guiding lamp over it. The layer being sealed at the top by water- and air-tight sheet, pressure being then reduced below the latter. The layer is formed by one or more skin-like strips of drainage sheet (2) joined together. A sheet permeable to water can be placed between the ground containing the drainpipes etc. (3) and the drainage strips. All sheets and strips can be installed at the same time.