| 摘要 |
The invention relates to a drainage element comprising a supporting member (1) consisting of mutually abutting internal cells (3) and external cells (3'). The bottom surface (6) of the walls (5,5') of the internal and the external cells (3,3') is larger than an upper surface (7) of said walls (5,5'). The bottom surface (6) of the internal cells (3) and the external cells (3') of the supporting member (1) is provided with grooves (8). A permeable foil (4) is connected to the bottom surface of the cells (3,3'). |
