Putzmeister goes underground for power plant job

Vorarlberger Illwerke AG is expanding its capacity for the European electricity market through the construction of the pumped storage power station, Kopswerk II, in Austria, which will have a turbine output of 450MW.

Power plant: the placing boom in action.
Power plant: the placing boom in action.

Vorarlberger Illwerke AG is expanding its capacity for the European electricity market through the construction of the pumped storage power station, Kopswerk II, in Austria, which will have a turbine output of 450MW.

The costs of building the cavern power station and the underwater systems are estimated to be US $41 million (EUR29.7 million).

During the construction of the cavern cavity, the extensive concrete work in the machine hall is being performed with just one stationary Putzmeister BSA concrete pump and one stationary concrete placing boom.

The project is located close to Kopswerk I in Montafon and, like this station, it also makes use of water from the Kopssee Lake. It comprises sections one and two, which include pressure tunnels, a surge tank and pressure shaft, as well as section three, with the machine chamber and transformer hall, together with the supporting systems and underwater systems.

Work on section three is being conducted by a consortium including Beton- und Monierbau Gesellschaft (Innsbruck), Alpine Mayreder Bau (Salzburg/Wals), Züblin AG Zweigniederlassung Tunnelbau (Stuttgart) under the overall management of Jäger Bau (Schruns).

The machine chamber is considered an essential structure of Kopswerk II. It measures 88m in length, 60.5m in height and 30.5m in width.

The blasting drive was started in January 2006 to excavate the cavern, in one crown section and 10 sidewall sections. The crown section was excavated during this process with two wall headings and a core. Four layers of structural steel lattice and a coat of shotcrete measuring about 10cm thick per reinforcement provided safety during the excavation procedure.

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