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Subway tunnel U4

VARIOKIT tunnel formwork carriage used during the construction of the U4 subway tunnel in Hamburg
View from above on Hamburg’s longest jobsite for the extension of U4 subway tunnel in direction to the “Elbbrücken“
Customized project solution for single-sided forming of the U4 subway tunnel in Hamburg.
Technical drawing of the load-bearing system solution for the forming of single-sided walls with the help of the VARIOKIT formwork carriage construction.

Project data

Location: Hamburg, Germany

  • 710-m long subway tunnel as component of the south-eastern extension of the U4 from the subway station “HafenCity Universität” to the new stop “Elbbrücken“.
  • The route with a total of 1.3 km mostly runs below the Versmannstrasse at a depth of about 20 meters.


  • Manufacturing of trough and tunnel in open-cut tunneling method – at a depth of up to 20 meters within a diaphragm wall excavation pit.
  • Semi-monolithic fabrication of a total of 71 tunnel segments with concreting cycles of 10 meters each – walls and slab in one pour.


Max Bögl, Ing.-Bau Hamburg

Customer's benefit

  • Adherence to the ambitious schedule through the fabrication of the tunnel segments in regular weekly cycles.
  • The loads can be transferred without ties within the formwork carriage structure, since concreting is done single-sided against the diaphragm walls.
  • The tunnel formwork adjusts itself to the changing cross-section widths and heights.
  • Cost-efficient project solution due to the possibility to rent the VARIOKIT system elements.
Portrait of Norbert Klopf, foreman at  Max Bögl, Ing.-Bau Hamburg
Norbert Klopf

Actually I am always satisfied with PERI. The cooperation is excellent, also details are always paid attention to and taken into consideration for finding a solution.

PERI solution

  • Customized PERI tunnel formwork carriage solution, mostly based on VARIOKIT system elements.
  • Jobsite-adapted formwork concept designed with meticulous attention to detail on the basis of good cooperation.