English (GB)
6
4.2.1 Backfill
Fig. 3
Compactors
• The backfill must provide sufficient support of the pit on all
sides and ensure that the load can be transferred without
detrimental point impacts or similar impacts. See fig.
Fig. 4
Even pressure on all sides of the pit
• The backfill must meet the same requirements as those for the
bedding layer.
• The backfilling must be carried out so that the pit is not
damaged or deformed.
Fig. 5
Oval pit after compaction
• The backfill must be compacted in layers of maximum 30 cm
(corresponding to approx. 20 cm after compaction).
Fig. 6
Insufficient compaction under pipes
Do not use plate compactors at a distance of less
than 30 cm from the pit wall.
T
M
06
36
02
06
15
TM
06
36
03
06
15
During backfilling, the cover must be fitted on the pit
to ensure that the pit is not deformed (becomes
oval).
T
M
02
93
61
24
04
1
Max.
25 kN
Max.
150 kg
1a
2
Compact the backfill under the inlet and outlet pipes
properly so that they are not exposed to downward
loads when the backfill settles. See fig.
T
M
02
93
60
24
04
If the hole for the pit is drilled, pay special attention to
the compaction of the backfill to prevent uplift.
Use mechanical compacting equipment and compact
the backfill to minimum 97 % proctor density.
