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5.5
Filling the trench
Suitable equipment should be used to move the
system gently into the prepared pit.
Before introducing the backfill material into the
excavation pit, the system is filled 1/3 with water
(fill water into the system outside the red hous-
ing). Subsequently, the backfill material (round
grain gravel, max. grain size 8/16) is filled and
compacted layer by layer in max. 30 cm steps to
the top edge of the tank. No backfill material
should enter the system. The individual layers
must be properly compacted with a hand tamper.
Be careful to avoid damaging the system when
compacting the gravel. Mechanical compacting
machines must not be used under any circum-
stances. The filling around the sides must be at
least 500 mm wide.
5.6
Positioning on a slope, embankment etc.
If the system is installed in the immediate prox-
imity (< 5 m) of a slope, mound or embankment
(greater than 5°), a statically calculated retain-
ing wall must be constructed to bear the pres-
sure of the soil. The wall must exceed the sys-
tem dimensions by at least 500 mm in all direc-
tions and have a minimum distance of 1000 mm
to the system.
5.7
Groundwater and cohesive (non-water-permeable) soils (e.g. loam)
The system may only be installed in groundwa-
ter/stratum water up to the specific height shown
in the adjacent drawing.
If it is to be expected that groundwater/stratum
water will be higher even occasionally, this must
be drained off through a drainage system.
If necessary, the drainage pipe must end in a
vertical DN 300 pipe in which a submersible
pressure pump is fitted to pump out the excess
water. The pump should be checked regularly.
The following earth coverings must be observed:
5. Installation and assembly
Suitable for pedestrian loading: 300 – 600 mm
Areas suitable for vehicle loading: min. 400 mm
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