Grundfos iGRID Montage- Und Betriebsanleitung Seite 12

Therefore, it is required that the district heating pipes outside the pit
are properly supported with piled-up sand pads (*) before sand and
soil are laid on top of the pipes. Failure to support the pipes can
lead to the entire pit being inadvertently filled with district heating
water.
• A: Front view
• B: Side view
*
A
*
B
Supporting the district heating pipes with piled-up sand pads (*), in
straight pipe layout
• A: Front view
• B: Side view
A
*
B
Supporting the district heating pipes with piled-up sand pads (*), in
layout with pipe bends
12
*
* *
*
5.1.3 Backfill
WARNING
Risk of collapse
Death or serious personal injury
‐
Make sure that the specified size of gravel is used for
the backfill.
• The plate compactor must not have mechanical
contact with the solution and the connected pipes.
• Use either a plate compactor or earth rammer when
working in proximity to the solution.
1 1a
Even pressure on all sides of the solution
Observe the following conditions when you carry out the backfill:
• The backfill must meet the same requirements as those for the
bedding layer.
• The backfill must provide sufficient support for the solution on all
sides and ensure that the load can be transferred without
detrimental point impacts or similar impacts.
2
Even pressure on all sides
• The backfilling must be carried out so that the solution is not
damaged or deformed.
Use mechanical compacting equipment and compact the
backfill to a minimum proctor density of 97 %.
Related information
5.1 Installing the solution
Max.
25 kN
Max.
150 kg