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4 Installation and assembly
4.2.3 Requirements for the excavated pit
4.2.3.1 Soil characteristics: installation situations
When planning and installing the system, the specifications for the respective soil and water conditions at
the installation site must be observed. A basic distinction is made between the installation situations de-
scribed in Tab. 6.
Installation situation
Dry soil
Damp soil
Tab. 6: Soil and water conditions in different installation situations
4.2.3.2 Stability
The walls of the excavated pit must be sloped, shored or otherwise secured in such a way that they are sta-
ble during the entire construction period and no persons are endangered by slipping or falling earth. The
pit must be kept free of water during the entire installation period.
4.2.3.3 Load-bearing capacity
The ground must have sufficient load-bearing capacity to permanently prevent the system from subse-
quently settling. If necessary, the load-bearing capacity must be established by compaction or a suitable
substructure.
4.2.3.4 Space requirements
The base area of the pit must be excavated in such
a way as to ensure compliance with the locally ap-
plicable regulations for the minimum working space
widths in pits and trenches on all sides of the sys-
tem. In most countries, a minimum working space
width of 50 cm applies (60 cm in the case of pit
shoring).
The width of the slopes or pit shoring must be
added to the total excavation area.
44
Soil characteristics
– Good load-bearing and dry soil
– No ingress of groundwater or stratum water at or above the level of the
base of the pit.
– Presence or possible ingress of groundwater or stratum water at or above
the level of the base of the pit.
Instructions Wastewater treatment system easyCompact
Fig. 7:
Distance from pit walls
963325
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