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  The 2nd Coentunnel - Design requirements from construction and service life risks

  The 2nd Coentunnel has to solve the traffic congestion around the Dutch capital. The project consists of the design and construction of an immersed tunnel under the North Sea Canal, the upgrading of the connecting highway structure and maintenance of the assets for 30 years. The design of an immersed tunnel is strongly characterised by the construction method, the transport by sea and the shallow depth. The new tunnel has been immersed at a close distance to the existing Coentunnel. In order to manage the risks involved, specific precaution measures have been taken to protect the existing tunnel. The tunnel structure has been prepared to take the loading of a sunken ship and the impact of a dropped anchor. The paper covers the general principle of an immersed tunnel, the design requirements from construction method and maritime risks and the protection of the existing tunnel.

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