AVN machine builds drainage channel in Freudenstadt
Mar 23, 2018
Where cities grow, the infrastructure has to keep up. In the Black Forest town Freudenstadt, a drainage channel has been created in the new residential area "Sonnenhalde Süd". A Herrenknecht AVN machine was used to integrate the nearby Manbach stream into the stormwater concept.
Over a distance of 146 meters, several tracks had to be crossed under, because the nearby Manbach stream is separated from the new residential area by the main train station. A gradient of 4.5%, was an additional challenge.
The 75kW machine crossed through so-called talus material consisting mainly of layered red sandstone. The AVN800XC tunnel borer with a mixed cutterhead is suitable for heterogeneous soils and, with its slurry-supported excavation concept, can be used for safe tunnelling in ground conditions of all kinds. The tunnel was lined with 3-meter-long reinforced concrete jacking pipes (DN 800, DA 1100).
After 3 weeks of tunnelling, the Herrenknecht machine reached its destination at the foot of a slope in late October and was lifted out of the excavation pit by a mobile crane.
With the completion of the construction project, the sewage network in Freudenstadt was thus expanded appropriately and adapted to the needs of a growing city.
Project data AVN machine builds drainage channel in Freudenstadt
MACHINE DATA M-2176M
Machine type: AVN800XC
Excavation diameter: 1,100 mm
Max. torque: 90 kNm
PROJECT DATA FREUDENSTADT
Tunnel length: 146 m
Lining method: pipe jacking
Application: storm sewer
Geology: layered red sandstone talus material
Customer: Peter + Partner Rohrvortrieb
Client: City of Freudenstadt (Germany)
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