Technical specifications

Project description

• Construction of 130 excavation pits
• 115 shaft structures and approx. 47 km of sewerage tunnel in 117 individual drives with individual lengths of < 20 m to 1.150 m

Construction method

• For excavation pits the diaphragm wall and bored pile construction methods
• Pipe jacking with DN 1600, DN 1800, DN 2200, DN 2400 and DN 2800 with 9 full-face TBMs using both the EPB- and slurry method
• Crossing beneath waterways (Emscher Canal, Rhein-Herne-Canal), railway lines, roads, dams, buildings and pipelines
• Standard pipe length 4 m
• Thickness of pipe walls between 21 cm and 39 cm
• Pipes consisting of acid-resistant concrete, some with additional special protection against corrosion. Microtunnel DN 300 to DN 1200
• Maximum allowed settlement 20 mm Construction of shaft structures with conventional climbing formwork and slipform method
• Also executed in acid-resistant concrete, partly with a special PE-HD lining as special protection against corrosion

Geology

• Emscher marl
• Sandy and silty clays
• Tunnel alignment entirely below the groundwater table
  with a water pressure of up to 3 bar above the pipe invert level