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width (simplified Ø) of the smallest grain and the second one those of the biggest grain:
e.g., 0/32; 2/16; 2/8; 2/32; 4/16. Which mixtures are available, strongly depends on the
regional gravel plants.
Tip: Concrete gravel, or treated concrete rubble, with a particle size of 0/32 mm is
particularly well suited for use in clay/loam soil conditions.
2.1.2 Grit is broken rock of the grain range of 2/32 and basically is suitable as a backfill
material; but because of its sharp edges the tank must be protected against damages,
e.g., by a sandy wrapping.
2.1.3 Excavation, sand and gravel mixtures with an irregular grain line are suitable as
backfill material if they correspond to the criteria under point 2.1.
2.1.4 Soil, loam or other cohesive soil conditions are not suitable for the backfilling.
2.2 Filling beyond the backfill
Excavated soil (point 3 figures 1 and 10) or other material can be used if this is stable
and permeable.
2.3 Backfilling and compaction methods
2.3.1 The backfilling and compaction methods to be used are described under point
3 (Installation instructions)
2.3.2 Methods that are not to be used include in particular adding water. Adequate
compaction is not achieved and the mixture of particle sizes combine in such a way that
the compaction is unstable.
2.4 Pipes
2.4.1 The feed pipe should be laid with a fall to the tank (>1%).
2.4.2 The overflow / drain pipe should have a deeper fall away from the tank than the
fall from the feed pipe to the tank.
2.4.3 The service pipe is to be installed to prevent any flooding from the tank entering
the service room (e.g., cellar) if the tank is full. This can be achieved, for example, by a
high enough incline of the pipe from the house to the tank. Or by the installation of a
seal.
2.4.4 The pipes have to be installed in such a way that frost damage is avoided. This is
to be arranged according to the local climatic circumstances, if necessary in co-ordination
with the local authorities.
AquaKing
DORW1112a
27.08.2013
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