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5 Installation at Site
Valve pit
CAUTION
One-sided pressure load on the valve pit when back-filling the construction pit
Damage to the valve pit!
▷ Fill the valve pit with water before back-filling the construction pit.
▷ Never use stones, shingle or coarse gravel as backfill material directly at the
valve pit.
A
Fig. 19: Back-filling and compacting the construction pit
A Valve pit size R1
B Valve pit size R2
ü The piping has been properly connected. (ð Section 5.5, Page 25)
1. Backfill the construction pit to DIN EN 1610 / DIN 4124 / DIN 18300 / NF P 98-331,
VOB and ATV-DVWK-A 127.
2. Properly complete the backfilling process. Take care to fill any cavities at the
valve pit with a suitable tool (e.g. spade) and compact the back-fill by hand.
ð Place sidefill (sand with a particle size ≤ 8 mm) in layers of up to 300 mm
around the collecting tank until a height of 500 mm has been reached.
ð Backfill the remaining pit with material corresponding to soil quality G1,
particle size < 16 mm, in layers of up to 300 mm.
3. Evenly compact the filling material to EN 1610 / DWA-A 139 and DIN 18300,
page 10, 3.11. During this process, continuously check the valve pit for any
deformations, other signs of uneven load and installation errors.
Installation at high groundwater level
1
2a
3
Fig. 20: Back-filling and compacting the construction pit at high groundwater level
A Valve pit size R1
B Valve pit size R2
1 Filling material
2a Steel mats
SRA
1
2
1 Filling material
2 Concrete base
A
1
2b
3
2b Concrete base
3 Reinforced concrete foundation /
reinforced concrete plate
4 Anti-lift grouting collar
B
4
B
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