Rehau RAUSIKKO Box MX Einbauanleitung Seite 56

56
07 Filling the excavation pit
EN
The working area next to the gravel trench or rainwater tank is to be filled with
non-cohesive, stone-free soil which can be compacted (sand or gravel, soil group G1
according to DWA work sheet A127) in 0.3 m thick layers.
Backfill must not be frozen or exceed 32 mm.
The filler base should be compacted in layers with a light to medium-weight vibration
plate with a maximum compaction force of 3 t.
Prior to spreading soil onto the boxes a 10 cm deep leveling layer of sand must be put
down. The ground is spread on top of the Boxes in layers by way of front filling with a
light digger or wheel loader of up to 15 t total weight.
These machines can only be driven over a sufficiently compacted layer of ground of
G1 material with a thickness of at least 50 cm.
Only the vibration plates (no vibro-tampers!) described above may be used for
compacting the ground of the filler layer.
Above a compacted covering height of 0.5 m the compaction may only be done with
heavy vibration plates (maximum compaction force 6 t).
It is to be ensured that the system is not driven over with heavy construction vehicles
with a maximum wheel load of 50 kN (SLW30) until the filing height reaches at least
0.80 m.
In the case of ditch-Box-gravel trenches with a percolation ditch and an underlying
Box-gravel trench the ditch surplus is spread across the Boxes once the geo-textile
filter has been pulled back. A 0.1 m thick layer of sand is then put on the gravel trench
and the 0.3 m thick layer of top soil on top of that. The ditch is then profiled with the
intended border incline and if necessary covered with ditch planting grid.