We offer Becker 320 retention and infiltration tunnels with technical approval. Drainage tunnels are made of plastic.
Capacity, dimensions and weight of the retention and infiltration tunnel
Model: BECKER 320 retention and infiltration tunnel module with technical approval.
- Module capacity: 320 l,
- Dimensions: 1205x800x630 mm,
- Weight: 9,50 kg,
- Durability: tunnels can be installed under parking lots for trucks weighing up to 30 tons.
Technical description of retention and infiltration tunnels
BECKER 320 retention and infiltration tunnels with front plates wrapped in filtration geotextile are designed for the infiltration and retention of rainwater collected from building roofs and from hardened surfaces, such as terraces, parking lots, streets and roads. Rainwater is directed to filtering devices to separate mechanical impurities, and then through sewage pipes to tunnels wrapped in filter fabric to retain and infiltrate water in the ground.
Infiltration tunnels are connected into groups (vertically and horizontally), with sizes depending on the size of the surface from which water is collected. Infiltration tunnels are laid in a trench on a gravel base, and in the case of poorly permeable soils, also in a gravel backfill in individual buildings and public buildings, in areas of pedestrian traffic, passenger car traffic and truck traffic.
- Top connections: DN 100 (or: DN 150; DN 200; DN 300),
- Bottom connections: DN 100,
- Inspection and vent connection: DN 100 or DN 200,
- Composition: PP/PE,
- Colour: black.
BECKER 320 infiltration tunnels are registered as new industrial design no. 002347658; are made by injection method from a mixture of recycled polypropylene and polyethylene (PP/PE). To vent the BECKER system tunnels and to connect to the installation and sewage network, sewage pipes and fittings made of PVC-U, meeting the requirements of the PN-EN 1401-1:2009 standard, or made of polypropylene (PP), meeting the requirements of the PN-EN 1852 standard, are used -1:1999 (+ PN-EN 1852-1:1999/A1:2002). Connections of BECKER system elements with pipes are sealed using elastomeric gaskets - rings.
Purpose, scope and conditions of use of the retention and infiltration tunnel
The BECKER system storm sewer tunnel sets are intended for the management/retention and gravitational distribution and infiltration of rainwater discharged from the building's roof and collected from hardened surfaces, but they can also be used to infiltrate sewage from biological sewage treatment plants.
BECKER element sets can be used in residential, public and industrial construction areas. Sets of system elements can be used in soils with low groundwater levels, in light and permeable soils, and in cohesive (poorly permeable) soils using gravel backfill.
When using BECKER system element sets, the following conditions should be met:
- the bottom of the trench should be precisely leveled and lined with a 10 cm layer of 8/16 gravel,
- BECKER 320 tunnels should be laid on a layer of gravel one behind the other and connected with edges and then wrapped with geotextile with a 30 cm overlap,
- the lower surface of the infiltration tunnels should be at least 1,0 m above the groundwater level,
- storm sewage pipes should be laid with a slope,
- tops of manholes/rainwater filters should meet the requirements of the PN-EN 124:2000 standard,
- the distance between the tunnels and the building with an uninsulated basement should be at least 6,0 m,
- to drain 100 m2 with rainfall 150 l/s/ha, min. from 3 – 7 tunnels depending on the soil permeability index.
Load limit and conditions for installing infiltration tunnels
Loads: permissible traffic load of trucks up to 30t
Minimum thickness of soil cover:
- 25 cm when loaded with foot traffic,
- 75 cm when loaded with passenger cars,
- 150 cm when loaded with trucks up to 30t.
Maximum foundation depth (measured from the bottom of the tunnel):
- 250 cm
When constructing BECKER retention and infiltration systems, the following standards should be taken into account:
- PN-B-10736:1999 Earthworks - Open excavations for water supply and sewage pipes, Technical conditions of execution,
- PN-EN 1295-1:2002 Static calculations of pipelines laid in the ground under various load conditions - Part 1 - General requirements,
- PN-EN 1610:2002 Construction and testing of sewage pipes.
