Projet

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.

Client	Bundesamt für Strassen ASTRA
Execution	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

images

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

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m

Diameter tunnel boring machine

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additional information

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