Grundfos iGRID P-Zone, Installation And Operating Instructions Manual, Page: 6 / 80

English (GB)
6
Pits with heavy top load covers are delivered separately from the
metal cover, concrete slab and concrete ring.
1. Lift the pit as shown in fig.
2 .
2. Lift the concrete ring as shown in fig. 4 .
3. Lift the concrete slab as shown in på fig. 5 .
4. Lift the metal cover as shown in fig. 5 .
Fig. 4 Lifting the concrete ring
Fig. 5 Lifting the concrete slab and metal cover
3. Installing the product
3.1 Preparing the foundation
With reference to DS/EN 1997-1: Eurocode 7: Geotechnical
Category 2:
• We recommend that you conduct a geotechnical survey of the
conditions on site before installing the pit.
With reference to DS/EN 1997-1: Eurocode 7: Geotechnical
Category 1:
The geotechnical survey may be deemed unnecessary if the
following conditions are met:
• There is an insignificant risk of general instability, soil
movement or adverse conditions.
• Comparable local experience shows that the ground
conditions are sufficiently uncomplicated.
• There is no excavation under the water level.
• Comparable local experience shows that the proposed
excavation under the water level will be without complications.
In case of doubt, contact a geotechnical specialist.
Fig. 6 Principle sketch of the installation
3.1.1 Foundation layer
• If soil analyses and information concerning the strain of the pit
indicate that the soil cannot support the weight of the pit, a
foundation layer must be prepared.
• The bedding layer on which the pit is placed is not regarded as
a foundation layer.
• The foundation layer can be constructed by adding a stable
layer of suitable gravel after excavation which is compacted in
layers of no more than 30 cm corresponding to approximately
20 cm after compaction. A foundation layer is also necessary if
the hole was mistakenly dug too deep.
3.1.2 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.
• Particle size over 16 mm must not occur.
• The content of particles between 8 and 16 mm must not
exceed 10 %.
• The material must not be frozen.
• Sharp flint and similar must not occur.
• The bedding layer must have a thickness of 10 cm.
TM
07
53
4
3
35
19
TM
07
5
248
35
1
9
-
TM
07
52
64
3
51
9
The installation of the pit must be carried out by
trained persons and according to local technical
regulations.
When placing the pumping station, be careful not to
damage any other equipment and vice versa.
T
M
0
7
5
06
6
3
0
1
9
Pos. Description
1 Foundation layer
2 Bedding layer
3 Backfill compacted in layers of maximum 30 cm
4
Distance of 50 cm from the cover where heavy traffic
must not occur
1
2
3
4 4