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5 Installation at Site
Valve pit size R1:
ü The piping has been properly connected. (ð Section 5.5, Page 25)
ü The system for lowering the groundwater level (if available) has been started up.
1. Place and fasten the steel mats on the reinforced concrete foundation /
reinforced concrete plate (3).
2. Mount the base reinforcement of the valve pit on the steel mats (2a).
3. Backfill the construction pit to DIN EN 1610 / DIN 4124 / DIN 18300 / NF P 98-331,
VOB and ATV-DVWK-A 127.
4. 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.
5. 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.
6. If a system for lowering the groundwater has been used, switch it off.
Valve pit size R2:
ü The piping has been properly connected. (ð Section 5.5, Page 25)
ü The system for lowering the groundwater level (if available) has been started up.
1. Pour concrete with a cement content of 300 kg/m
concrete base (2b) has got a height of 500 mm.
2. Allow the concrete to set.
3. Backfill the construction pit to DIN EN 1610 / DIN 4124 / DIN 18300 / NF P 98-331,
VOB and ATV-DVWK-A 127.
4. 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.
5. 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.
6. If a system for lowering the groundwater has been used, switch it off.
SRA
3
into the pit in layers until the
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