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  Tunneling of highly inclined tunnels near critical infrastructures

  As part of the cable undergrounding project of a section of power lines in the city of Lugano, in a highly-urbanized area, a tunnel named “Vezia-Crespera cables tunnel” was excavated using a 3.6 metres in diameter TBM for about one kilometer in length. This tunnel also would also supply power to the Ceneri base railway tunnel which was still under construction. In order to expand the underground network connecting the power companies of Lugano, the main tunnel was connected in two strategic points with existing tunnels by two inclined tunnels with gradients of 58% and 36%.

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