A Milestone at the Stuttgart site: Filder Tunnel kick-off
Aug 04, 2014
Weighing in at 2,000 metric tons, the Herrenknecht AG tunnel boring machine is to commence work on excavating two single-track tunnel tubes through the Filder Plateau extending along the south of the Baden-Württemberg capital of Stuttgart.
A new phase has begun in the construction of Stuttgart's underground railway station as political and business representatives celebrated commencement of construction of the Filder Tunnel on Thursday. At the event, CEO of Deutsche Bahn AG, Dr. Rüdiger Grube, claimed: "Construction of the Filder Tunnel is a technical masterpiece highlighting German engineering all over the world."
The Minister of Finance and Economy in the state of Baden-Württemberg, Dr. Nils Schmid, added: "In Baden-Württemberg, tradition and innovation go hand in hand. The tunnel boring machine is a superlative in terms of steel as well as being a technical masterpiece."
The tunnel boring machine is a multi-mode machine with the result that it is convertible. In the upper section of the Filder Tunnel, it works in closed mode with a screw conveyor while the lower section involves open mode with belt conveyor discharge. This is attributable to the varying layers of rock: the machine is obliged to penetrate sandstone with marls and clays and nodular marl as well as unleached gypsum keuper. The tunnel boring machine will overcome an altitude of 155 meters and an incline of up to 2.5 percent. The only area of the tunnel where the machine is not used is the central section – the geological transition zone where miners will remove the material from the rock using diggers and loosening blasting procedures.
The use of automatic tunnelling technology enables the delivery of tunnel elements and transportation of excavated material via the highway and away from the city center. This relieves Stuttgart and its inhabitants from most of the transport by truck.
An open day was then held on the site for anyone who was interested in finding out more.
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