A boring machine for the Gotthard tunnel

During the construction of the Gotthard tunnel, "Sissi" ate its way through the stone deep into the mountain – together with three other gigantic tunnel boring machines. Sissi's powerful drill heads weighed 220 tons each, with a diameter of 9.5 metres. Enormous pressure cylinders pushed the drill heads against the stone with a pressure of up to 26 tons. The drilling components weighing up to 125 kilograms each broke through the granite, gneiss and other mineral layers layer by layer.

Deep in the tunnel, the drop forged components from Buderus Edelstahl demonstrated their outstanding quality with impressive skill: Strength, wear-resistance and weight fulfilled the highest requirements. The tunnelling machines were in use below ground 18 hours a day. Technicians spent six hours a day maintaining the machines and the drilling tools. Under these enormous strains, the components from Buderus Edelstahl demonstrated their unique strengths and made a major contribution to the success of this historic tunnel construction project.

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