| 摘要 |
1. A device for fixing drainage pipes fitted with filter nozzles to the concrete floor of a filter bed, more particularly for water treatment, the device having for each drainage pipe a vertical pipe stub which is concreted into the floor and which leads into a filtrate collecting duct under the floor, characterized in that a plurality of pipe stubs (1, 15) are passed through two closed yokes (3, 4 ; 13, 14) and are combined to make a pipe array (5), the yokes (3, 4 ; 13, 14) being mutually spaced by a distance (a) approximately corresponding to the thickness of the concrete floor (12) and serving simultaneously as permanent formwork for at least part of the area of the concrete roof (7) of the collecting duct (6). |
