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5 Installation at Site
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
Fig. 18: Back-filling and compacting the construction pit
1 Filling material
2 Concrete base
Table 6: Filling height depending on the size
Size
1000
1400
1800
ü The piping has been properly connected. (ð Section 5.5, Page 25)
1. Fill the collecting tank with water.
2. Pour concrete with a cement content of 300 kg/m
filling height H
concrete base (2) has to be at least 100 mm above the anti-lift grouting collar
(4).
ð For a filling height H
been reached. Then allow the concrete to set. Repeat this procedure until the
filling height H
3. Allow the concrete to set.
SRA
3 Reinforced concrete foundation /
reinforced concrete plate
4 Anti-lift grouting collar
has been reached (see table above). The upper edge of the
min
> 1 m: Pour concrete until a filling height of 1 m has
min
has been reached.
min
4
Filling height H
min
[mm]
720
943
1228
3
into the pit in layers until
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