Excavation - Garantia CRISTALL 200030 Instrucciones De Montaje Y Mantenimiento

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5. Installation and assembly
5.2

Excavation

So that sufficient working room is available, the surface area of the excavation should exceed the tank
dimensions on all sides by approximately 500 mm, the distance from solid building constructions must be
a minimum of 1200 mm.
The excavation slope is according to DIN 4124. The ground for setting down must be level and smooth
and must provide a sufficient load bearing capacity.
The depth of the excavation must be measured so that the maximum allowable earth covering (1000 mm
from the top surface of the tank) above the tank is not exceeded. For an all year round utilisation of the
system it is necessary that the tank and the water supply pipes and equipment are installed in a frost free
environment. The depth for a frost free installation is generally around 800 mm, precise data for this
should be requested from the appropriate administrative authority.
As an under surface for setting down, a layer of smooth sand with a grain size of 8/16 ac-cording to
DIN 4226-1 and a depth of from 150 to 200 mm should be used.
5.2.1 Ground water and cohesive (impermeable) soil
For groundwater only appearing occasionally and
impermeable soils such as clay, it is necessary to
provide a sufficient run off (drainage) for the ground or
seepage water so that the tanks are never deeper in
the ground water than 500 mm. In certain cases the
drainage pipe may lead into a 300 mm diameter
vertical pipe with a submersible pump installed so that
excess water will be automatically pumped away. This
pump system must be inspected at regular intervals.
If it is expected that the tanks may be immersed
deeper, then it is especially important to install a
sufficient drainage.
5.2.2 Slope and gradient locations etc.
When installing a tank close to (< 5 m) a slope, earth
mound or embankment, a retaining wall that has been
statically calculated must be built to take up any
pressure applied by the earth. The retaining wall must
over reach the tank dimensions by at least 500 mm in
all directions and be positioned at a distance no closer
than 1200 mm from the tank.
5.2.3 Installation of tanks adjacent to areas
traversed by heavy goods vehicles
Traffic area
When installing the tank adjacent to areas that will be
traversed by traffic heavier than passenger cars, then
it is absolutely necessary to guarantee that the load
that occurs due to these vehicles will not be
transferred to the tanks. The minimum separating
distance is equivalent to the excavation depth.
Minimum distance to traffic areas:
Tank 1600 L 2650 L
Distance 1670 mm 1950 mm
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