Belchen Tunnel Renovation, A2
Belchen Tunnel Renovation, A2

Belchen Tunnel Renovation, A2

Hägendorf, Switzerland

The A2 national free­way crosses the Jura mountains between the cantons of Solothurn and Basel through the Belchen Tunnel. The geo­logy was in­creas­ingly damaging the two ex­isting tunnel tubes from the 1960s. This meant they had to be re­novated. To minimize the as­soci­ated traffic congestion, a third tube was built in the form of the Belchen re­novation tunnel. The Marti Belchen consortium was heavily involved in the construction.


Bundesamt für Strassen ASTRA


Marti Tunnel AG
Marti Technik AG
Renesco AG
Marti AG Basel
Marti AG Bern
Marti AG Solothurn
Marti AG, Bauunternehmung, Zürich

Construction period

2014 – 2019


Facts & Figures

special features

  • Geology: Gypsum limestone (Opalinus clay, shell limestone, marl)
  • Driving operations with tunnel boring machine (single shield) with integrated segment installation
  • Exhaust air gallery using the blasting method
Tunnel length
Diameter tunnel boring machine

additional information

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