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  Immersed tunnel in congested city. Marieholm Tunnel – Gothenburg, Sweden

  The Marieholm tunnel is a new immersed road tunnel in Gothenburg, Sweden. The immersed section is 500 m long with three traffic lanes in each direction. The challenge of the project is construction in the city with limited space and difficult transport logistics. Down streams an existing tunnel and a bridge limit transportation width and depth. Two bridges nearby will be constructed just before or simultaneously with the tunnel. Soil conditions with 100 m of soft clay layer deep excavations difficult. Construction methods including pre-fab elements transported to site and full element cast at site are discussed. In the permanent situation the design challenges are the foundation on soft clay and the geometrical design of the tunnel; to fit within the requirement for road alignment and depth clearance for ship traffic. The development of the owners design has been done in close cooperation between the owner – The Swedish Transport Administration and the consultant – COWI AB.

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