Placing And Filling; Laying Connections - Garantia COLUMBUS Notice D'installation Et D'entretien

6.4

Placing and filling

The tanks are guided and placed into the
excavation using suitable equipment and
without any knocks. (See also point 5 –
Transport and storage)
To avoid deformation of the tank during the
embedding/back fill process, it is important to
first fill the tank to 1/3 with water and then to
begin back filling and embedding/compacting
in even layers of no more than 300 mm until
the 1/3 level. Please note, that this layer must
be well-compacted! Following this the tank
must be filled to 2/3 with water and the
process of filling in layers of 300 mm repeated
until the 2/3 level is reached, each layer must
be well compacted with a hand tamper.
Repeat the process
completely embedded. Care must be taken
during the embedding to ensure the tank is not
damaged. Under no circumstances should
powered compacting machines be used. The
surrounding back fill must be at least 500 mm.
When installing the tanks in an area to be traversed by light traffic (passenger cars) there must be a
final load bearing layer of coarse gravel approximately 200 mm to 300 mm deep. The area of the load
bearing layer of coarse gravel must be equivalent to the base of the excavation.
Backfill material:

The filling materials must be ideal for compacting, be permeable, shear resistant, remain frost
free and contain no sharp objects.

These qualities are accomplished with smooth sand not exceeding the grain size 8/16 according
to DIN 4226-1.

Excavated earth or "fill sand" are in most cases unsuitable.

Earth, clay and other impermeable soils are not suitable for back filling/embedding.
6.5

Laying connections

All supply and run off pipes must have a gradient of at least 1 % (subsequent settling of the fill materials
should be taken into account). The connection is made to the previously cut openings on the tank. For
integrated filters there may be special connecting requirements, it is important to follow the specific
installation instructions. If the overflow pipe is connected to the municipal canalisation system, then
according to DIN 1986 for combined sewers over a lifting system or when connected to a rainwater
canalisation, the system must be protected by a back water gate (non return gate).
All suction, pressure and control pipelines must be installed in a protective pipe that is laid so that it has a
falling gradient to the tank, without bending and is as straight/direct as possible. Any elbows required
should be no more than 30°. The protective pipe should be kept as short as possible.
Important: The protective pipe must be connected to an opening above the maximum water level.
So that a ventilation of the tank is possible, a 100 mm diameter canalisation pipe is connected to a free
opening and is laid in an upward gradient to the venting point. It is not permitted to join the ventilation pipe
to other pipes or ventilation systems.
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6. Installation and assembly
until the tank is
4
3
7
1

Tank

Compacted foundation

Subsoil

Surrounding (round-
grained gravel 8/16)
16 / 36
ß
nach DIN 4124
6
5
7
2

Dome shaft with telescopic access

Covering layer

Please note, that the filling must
be well-compacted!
ß
> 100 mm
< 300 mm
< 300 mm
< 300 mm
< 300 mm
< 300 mm
< 300 mm
< 300 mm
< 300 mm
> 150 mm