Sep 04, 2017
With the breakthrough of the last two tunnel boring machines into the target pit in Oberhausen-Biefang on June 12, 2017 the tunnel and pipe jacking work for the Emscher sewer has been completed. Over a period of 25 years numerous Herrenknecht tunnelling machines and a wide range of additional equipment were successfully used in the Europe-wide unique environmental and sewage project of Emschergenossenschaft.
The result was outstanding top performances of up to 177 meters per week and up to 582 meters per month, which played a decisive part in the success of the overall project.
One of the special tasks in the realization of construction section 40 was the technically demanding tunnel alignment with several, partially tight curve radii of up to 200 meters. The alignment runs mostly below the A2 motorway and a multitude of inner city supply lines. In addition, an approximately 300 meter long geological fault zone with sandy and groundwater-bearing subsoil had to be passed through. The limited space available at the total of three launch shafts necessitated an optimal logistics concept. For these requirements, solutions were developed in advance and successfully implemented by the site crew during the construction phase.
Over almost 25 years the contractors relied on Herrenknecht's project-specific tunnelling technology for the underground excavation work in construction sections 20, 30 and 40. This included numerous AVN machines for pipe jacking in the smaller diameter range, EPB Shields using the pipe jacking and segmental lining methods as well as a Vertical Shaft Sinking Machine or VSM to sink a 23 meter deep launch shaft.
The Emscher, whose source rises in Holzwickede to the east of Dortmund, passes through a series of cities in the German Ruhr area on its 80 kilometer path before it flows into the Rhine. Since the beginning of industrialization around 1850, the small lowland river was used as an open channel for sewage, flood and rainwater and degenerated into the dirtiest river in Europe. With the renaturation of the stream, one of the main tasks of the Emschergenossenschaft founded in 1899, in future sewage and rainwater will be separated again, drained away underground and purified in intermediate treatment plants. As a result the river will become clean again in the long term and the quality of life of the people in the Ruhr area will increase. Commissioning of the 51 kilometer long Emscher sewer is planned for the end of 2020.
MACHINE DATA M-1856/M-1857
Machine type: 2x EPB Shield
Excavation diameter: 3,397 mm
Max. torque: 1,600 kNm
Tunnel length: a total of 2x 10,000 m
Lining method: Segmental lining
Application: Sewage › Geology: Emscher marl, sand
Contractor: PORR AG Austria
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