Storebælt railway tunnels Design and construction of the Storebælt rail tunnels were part of a project to create road and rail links to Storebælt. These tunnels are located between the islands of Funen and Zealand and were built as part of the development of a fixed link between Copenhagen and the Continent. The Great Belt Fixed Link (a road and rail connection between Denmark’s two largest islands, Zealand and Funen) is the country’s leading transport corridor.
Due to Geotechnical conditions (ground was unstable or prone to water seepage), It was foreseen tunnel hydrostatic pressure due to seepage, so calculations for hydrostatic pressure with maximum depth reached by the tunnels under the sea. The TBMs (Tunnel Boring Machine) were chosen which were two for each direction thus both tunnels were completed going from each end meeting in the middle, after tunneling a lining of precast concrete segments (40 cm thick, and forming rings (165 cm wide)).
Information: Client: A/S Storebæltsforbindelsen Project management: Cowi A/S & Mott Mac Donald Group JV Excavation (Und): 900,000 m3 Earthworks: 7 million m3 Concrete: 80,000 m3 Length: 7.4 Km with interior Diameter 7.7 m Engineer structures: 18 Km