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Abstract:	In 2004, ÖBB-Infrastruktur AG started the first studies for the construction of a pumped-storage hydro power plant between the two largest reservoirs of the existing Stubach Valley power plant group in Salzburg's Pinzgau region. Two reversible pump-turbine units including a full converter with a total capacity of 170 MW and a maximum flow of 80 m3/s are planned. The construction of the 335 million. euro project started in 2020 and will be completed by autumn 2025. In addition to a 50,000 m3 cavern, an 11.5 km tunnel system including the access tunnels and the power water ways have been built. Most of the 11.5 km tunnel system is situated in stable gneiss. A greater challenge is the construction of the two inlet and outlet structures in the high mountain region during the winter season, when the lakes can be held on the lowest reservoir level. Since the remaining construction work is also carried out at an altitude of 1500 to 2250 m above sea level in alpine terrain, the construction company has been facing recurring problems such as snow, cold, wind, mudslides and the associated logistical difficulties. Despite these challenges, the excavation work was completed in summer 2022. The main focus is currently placed on the concrete works in the cavern, which is scheduled to be completed in autumn 2023. This will be followed by the installation of mechanical and electrical equipment as well as the control systems. Die ÖBB-Infrastruktur AG begann 2004 mit den ersten Studien für den Bau eines Pumpspeicherkraftwerks zwischen den zwei größten Stauseen der bestehenden Kraftwerksgruppe Stubachtal im Salzburger Pinzgau. In einer Kaverne werden zwei reversible Pumpturbinen-Maschinensätze samt Vollumrichter mit einer Gesamtleistung von 170 MW und einem maximalen Durchfluss von 80 m3/s vorgesehen. Der Bau des 335 Mio. Euro teuren Projekts begann 2020 und dauert bis Herbst 2025. Neben einer 50.000 m3 großen Kaverne wurden auch 11,5 km Tunnel- und Stollen für das Projekt aufgefahren, weitgehend in standfesten Gneisen. Deutlich schwieriger gestaltet sich der Bau der Ein- und Auslaufbauwerke in den beiden Hochgebirgsstauseen, hier kann nur im Hochwinter bei abgesenktem Seepegel gearbeitet werden. Da auch die restlichen Bauarbeiten in einer Höhe von 1500 bis 2250 m ü.A. in alpinem Gelände stattfinden, wird die ausführende Baufirma wiederkehrend vor die damit verbundenen Probleme wie Schnee, Kälte, Wind, Vermurungen und die daraus resultierenden Logistikerschwernisse gestellt. Trotz der Herausforderungen konnten die Ausbrucharbeiten im Sommer 2022 abgeschlossen werden. Das Hauptaugenmerk liegt derzeit im Ausbau der Kaverne, hier laufen bis Herbst 2023 die Betonarbeiten, danach folgt die Installation von Maschinenbau, Elektro- und Leittechnik.
Source:	Geomechanics and Tunnelling 15 (2022), No. 5
Page/s:	491-501
Language of Publication:	English/German

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