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  Söderströmtunnel: immersion in downtown Stockholm, Sweden

  The Söderströmstunneln is one of the most challenging parts of the new Citybanan, a 6 km long railway tunnel crossing the ancient centre of Stockholm. Major parts of this underground link can be executed using the common drill and blast method. But this does not apply to the 450m long immersed Söderströmstunnel crossing the Söderström, connecting the islands Riddarholmen and Södermalm. Unique in the immersion operation is the use of external temporary jack supports on the piled and raft foundations and sliding plates underneath the tunnel elements, to support and slide the elements to their final position. Other aspects are the temporary underwater parking of the Riddarholmen element inside the joint house, to create space for the immersion operation of the centre element, and the usage of two different immersion pontoons, to deal with the different lengths of the elements and the reduced space around the abutments of the tunnel.

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