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  Floating Construction of an immersed tunnel – Söderströmstunnel

  The immersed tunnel “Söderströmstunnel” located in Stockholm is under completion. The three tunnel elements were constructed with an outer steel shell, transported from Tallinn to Sweden on a barge. After offloading the steel shell, concrete was cast while still in a floating condition. This paper will describe the methods and challenges of the concrete casting procedure and the special design of the final movement joint. The dimensional control of the elements during casting and immersion, to ensure the free room profile and joint connection. The statically system of the tunnel during temporary and permanent phases demanded tight control of the weight distribution to avoid overloading of both tunnel and pile supports. The tunnel does not have a traditional closing joint, instead a movement house “joint house” is used. Initially the last element is temporary sealed within the joint house with a system of hydraulic operated seal at 20 m water depth.

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