English (GB)
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4. Installing the product
4.1 Preparing the foundation
With reference to DS/EN 1997-1: Eurocode 7: Geotechnical
Category 2:
We recommend that you complete a geotechnical investigation of
the site conditions before you install the pit.
With reference to DS/EN 1997-1: Eurocode 7: Geotechnical
Category 1:
The geotechnical investigation can be judged to be unnecessary,
if the conditions below are fulfilled:
• There is a negligible risk of overall instability, ground
movements or adverse ground conditions.
• Comparable local experience shows that the ground
conditions are sufficiently uncomplicated.
• There is no excavation below the water table.
• Comparable local experience indicates that the proposed
excavation below the water table will be uncomplicated.
In case of doubt, consult a geotechnical specialist.
Fig. 2
Schematic installation drawing
4.1.1 Foundation layer
• The pit must be placed on a foundation layer if soil analyses
and information about the pit load indicate that the soil is not
capable of bearing the weight. The bedding layer on which the
pit is placed is not regarded as a foundation layer.
• The foundation layer can be made after the excavation by
laying a stable layer of suitable gravel or similar material and
compacting it in layers of maximum 30 cm (corresponding to
approximately 20 cm after compaction). Such a foundation
layer is also required if the excavation has become too deep
by mistake.
4.1.2 Bedding layer
• The material for the bedding layer must be compactable and
composed so that neither its properties nor the compaction will
cause damage to the pit.
• Grains larger than 16 mm must not be present.
• The content of grains between 8 and 16 mm must not exceed
10 %.
• The material must not be frozen.
• Sharp flint etc. must not be present.
• The bedding layer must have a thickness of 10 cm.
4.2 Installing the pit
Place the pit on the bedding layer.
Check that the pit is vertical.
Groundwater must not rise above the bedding layer until
backfilling has been completed.
CAUTION
Collapsing hazard
Minor or moderate personal injury
- Support for the crane must be placed at a suitable
distance from the pit to avoid collapse of pit hole.
Work according to local regulations.
Installation of pits must be carried out by an
authorised person in accordance with local
regulations.
Work in or near wastewater pits must be carried out
according to local regulations.
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04
Pos.
Description
1
Foundation layer
2
Bedding layer
3
Backfill, compacted in layers of maximum 30 cm
4
Distance of 50 cm from cover where heavy loads must
not occur
Select the location of the pit so that its installation
does not damage other equipment. And the other
equipment must not damage the buried pit.
4
4
3
2
1
Check the pit for external damage before lowering it
into position. When the pit has been installed,
Grundfos cannot be held responsible for possible
damage.
CAUTION
Collapsing hazard
Minor or moderate personal injury
- Support for the crane must be placed at a suitable
distance from the pit to avoid collapse of pit hole.
Work according to local regulations.
Before lowering the pit into position, retighten various
connections, as they may have become loose during
the transport.
