5 Installation at Site
29 of 62
SRA
2334.810/03-EN
5.6 Back-filling and compacting the construction pit
CAUTION
Insufficient compacting of filling material
Sinking of the ground around the collecting tank!
▷
Before starting with the compaction, determine the compaction required.
▷
Do not use hydraulic compaction.
Collecting tank
CAUTION
One-sided pressure load on the collecting tank when back-filling the construction
pit
Damage to the collecting tank!
▷
Fill the collecting tank with water before back-filling the construction pit.
▷
Never use stones, shingle or coarse gravel as backfill material directly at the
collecting tank.
1
2
3
4
H
m
in
Fig. 18:
Back-filling and compacting the construction pit
1 Filling material
3 Reinforced concrete foundation /
reinforced concrete plate
2 Concrete base
4 Anti-lift grouting collar
Table 6:
Filling height depending on the size
Size
Filling height H
min
[mm]
1000
720
1400
943
1800
1228
ü
The piping has been properly connected. (
1. Fill the collecting tank with water.
2. Pour concrete with a cement content of 300 kg/m
3
into the pit in layers until
filling height H
min
has been reached (see table above). The upper edge of the
concrete base (2) has to be at least 100 mm above the anti-lift grouting collar
(4).
ð
For a filling height H
min
> 1 m: Pour concrete until a filling height of 1 m has
been reached. Then allow the concrete to set. Repeat this procedure until the
filling height H
min
has been reached.
3. Allow the concrete to set.
