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  Factors to the successful construction of underground pumped storage power plants in the Alps The contractor’s view Linth-Limmern power plant

  The realization of an underground pump-storage power plant represents a huge challenge. The construction of the 1000MW Linth-Limmern plant in the Alps is currently one of the biggest energy- related construction projects in Switzerland. The challenges are multiple, on the one hand in particular the parallel activities of different underground works, such as tunnels, caverns, vertical/inclined shafts and logistics openings. On the other hand the installation of different services and other plant equipment for material processing, concrete work and conveyer belt systems. An unexpected incident occurred, as the TBM by driving the inclined shaft run into an fault zone, unknown in terms of its type, scope and extend. It was a mud field karst, subsequently found to have a length in the tunnel axis of about 15m. A system consisting of a pipe shield bridge, liner-plates and a modification of the TBM –first to be developed- enabled the TBM to traverse the karst.

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