Skip navigation

U-Bahn Baulos 1S4, Undercutting the Wilhelm-Marx-Haus

The Wilhelm-Marx-Haus was built between 1921 and 24 as Germany's first high-riser made of reinforced concrete brickwork. It is 56 m high and has 2 underground floors. The house is set up on a flat, continuous 0.80 to 1.20 m thick concrete plate, which is reinforced stripwise in accordance with the support frame. Underground floors of differing heights call for extremely varied foundation elevations. The tower-like building was almost completely undercut, the wing building only 60 % undercut by 2 of a total of 5 Underground tunnels lying alongside one another. The weight of the construction elements requiring supporting amounted altogether to approx. 200 MN (20.000 t). The use of the offices and retail shops located in the Wilhelm-Marx-Haus was not allowed to be negatively affected by the undercutting operations. Care also had to be taken to ensure that the facade of the protected building was not damaged.


  • Country: Germany
  • Region: Nordrhein-Westfalen
  • Tunnel utilization: Traffic
  • Type of utilization: Underground, urban and rapid transit
  • Client: Landeshauptstadt Düsseldorf, U-Bahn-Amt
  • Main construction method: trenchless
  • Type of excavation: Roadheader
  • Lining: Concrete formwork
  • No. of tubes: 5
  • Tunnel total length: 200m
  • Construction start/end: January 1979 till July 1983