Insertion And Filling - Graf Carat XL Serie Instrucciones Para Montaje Y Mantenimiento

5.2.1 Slope, embankment, etc.
On installation of the tank in the immediate vicinity (< 5 m) of
a slope, earthen mound or slope, a statically calculated
supporting wall must be erected to absorb the soil pressure.
The wall must exceed the dimensions of the tank by at least
500 mm in all directions, and must be located at least
1000 mm away from the tank.
5.2.2 Groundwater and cohesive (water-impermeable)
soils (e.g. clay soil)
With only occasional ground water and cohesive, water-
impermeable soils (e.g. loam), adequate drainage of the
ground water or leakage water must be ensured so that the
tanks never stand deeper in the ground water than indicated
in the table. If necessary, the drainage line must end in a
vertical DN 300 pipe in which an immersion pressure pump
is installed to pump off the excessive water. The pump must
be checked at regular intervals. If it is to be expected that
the tanks could sink lower, adequate drainage must be
ensured in all cases. We recommend the general laying of a
drainage line, since in the event of prolonged rainfall the
ground water level can rise unexpectedly.
Installation adjacent to surfaces used by vehicles
If the underground tanks are installed adjacent to surfaces
which are used by heavy vehicles weighing over 12 t, the
minimum distance away from these surfaces is at least the
depth of the trench.
5.3

Insertion and filling

The tanks must be inserted, impact-free, into the prepared
trench using suitable equipment. The tank is filled with 1/3
water before filling the tank surround.
Afterwards the surrounding (roundgrain gravel, max. grain
size 8/16) is then filled in layers of max. 40 cm steps and is
compacted.
The individual layers must be well-compacted (manuel
tamper). Damage to the tank must be avoided during
compaction. Mechanical compaction machines must not be
used under any circumstances. The surrounding must be at
least 500 mm wide.
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5. Installation and assembly
15 / 36
>800<1800 mm
Tank size
Immersion depth
10.000 L
1142,50 mm