A Herrenknecht microtunnel boring machine (MTBM) has been used to microtunnel a stormwater drainage channel in Freudenstadt, Germany.
Trenchless contractor Peter + Partner Rohrvortrieb used the 1,100 mm outside diameter MTBM to complete a 146 m drive through layered red sandstone, pipe jacking 3 m long DN 800 reinforced concrete pipes.
The microtunnel will integrate the nearby Manbach Stream into the City of Freudenstadt stormwater system.
The project faced the challenge of crossing beneath several train tracks at the nearby station and facing a 4.5 per cent gradient.
The MTBM was equipped with a mixed cutterhead suitable for varied soils and used a slurry-supported excavation concept.
The project allows precipitation to be discharged through the municipal storm sewer system into the Manbach drainage channel.
The project’s completion expands Freudenstadt’s sewage network to meet the needs of the city’s population growth.
Microtunnelling took three weeks to complete, with the MTBM reaching its destination in late October 2017.
For more information visit the Herrenknecht website.
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