U5 East Lot 2

Technical data

Project description

• The approximately four kilometre long section of Lot 2 from the starting shaft east of the existing Sengelmannstraße U1 station to Bramfeld is being constructed using a tunnel boring machine
• It includes the three stops Barmbek Nord, Steilshoop and the final stop Bramfeld, all of which are being constructed using the cut-and-cover method. In addition, the five emergency exits Rübenkamp, Steilshooper Allee, Gründgenstraße, Fabriciusstraße and Heukoppel are to be constructed along the route
• The tunnelling ends in the Heukoppel target shaft, which will then be converted into an emergency exit

Construction method

• The three underground stations, each approx. 200 metres long, the starting shaft and the five emergency exits are to be constructed in excavation pits using the diaphragm wall-cover or diaphragm wall construction method
• The TBM tunnel with an internal diameter of 9.30 m is to be excavated using the TBM hydro-shield method with a single-shell segmental lining, lining thickness 50 cm

Geology

• sandy fillings
• floodplain sediments with peat layers and meltwater sands, muds, humic sands, peat and gravel layers
• Deposits from the penultimate ice age (cohesive boulder clay, meltwater sand and gravel, basin sand, silt and clay, Lauenburg clay)

General data

Project

U5 East Hamburg, Lot 2

Client

Hamburger Hochbahn AG

Contractor

Wayss & Freytag Ingenieurbau in joint venture with Ed. Züblin AG

Construction period

August 2023 to May 2031 or February 2033

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