Large Road Tunnel By Herrenknecht TBM Constructed In Switzerland

The shell of the Belchen rehabilitation tunnel has been completed. Tunnelling ended successfully in Eptingen in the Swiss canton of Basel-Country on June 21, 2017, three months ahead of schedule.

The tunnel boring machine (TBM) (diameter 13.91 meters) designed and manufactured specifically for this purpose at the Herrenknecht plant in Schwanau, Germany, excavated 3.2 kilometers of tunnel through complex geology in only 16 months. The new structure is the prerequisite for rapid and economic rehabilitation of the two existing parallel road tunnel tubes.

Diameter 13.91 meters, weight 2,000 tonnes, length 75 meters – the Single Shield TBM manufactured at the Herrenknecht plant in Schwanau specifically for construction of the Belchen rehabilitation tunnel is the largest of its kind. The giant machine bored and secured up to 90 meters of tunnel per week through the complex and varied geology of the Belchen mountain range. Under the direction of Marti Tunnelbau AG, commissioned by the Swiss Federal Roads Office FEDRO, the tunnelling crew took only 16 months for the 3.2 kilometer long drive, despite 1-shift operation Mondays to Fridays. As a result, they navigated the TBM through the mountain three months faster than originally planned.

After launching at the southern portal at Hägendorf (Canton of Solothurn) on February 9, 2016, the project participants celebrated the successful breakthrough at the northern portal near Eptingen (Canton of Basel-Country) on June 21, 2017. FEDRO Director Jürg Röthlisberger as well as the Baselbiet cantonal councilor Sabine Pegoraro and her Solothurn counterpart Roland Fürst among others congratulated the jobsite crew on project completion on site.

The Belchen Tunnel, which cuts through the Jura Mountains between Basel and Lucerne, is of great importance to the north-south road traffic via Gotthard as well as for domestic Swiss traffic. Currently an average of 55,000 vehicles per day over a length of almost 3.2 kilometers pass through the twin tube road tunnel of the A2 road HERRENKNECHT . Press Release Page 2/4 Herrenknecht AG Schlehenweg 2 77963 Schwanau Corporate Communications Tel. +49 7824 302-5400 tunnel with two lanes in each direction. As a result of increasing rock pressure, both tubes are urgently in need of repair to ensure operational safety

The rehabilitation tunnel now completed was excavated through the mountain to the west of the two existing tubes at a distance of 40 to 116 meters from the existing tunnel system. Along the tunnel alignment the miners from Marti Tunnelbau AG mastered the challenging geological conditions with the Herrenknecht Single Shield TBM with overburdens of up to 360 meters. Soft layers of rock alternated with up to 225 MPa hard layers, in places with karstified and water-bearing transition zones. In addition, long sections of squeezing opalinus clay and swelling gypsum keuper had to be passed through. Site manager Sergio Massignani summarized after the breakthrough: “Thanks to the comprehensive knowledge of the ground conditions from the two existing tunnel tubes, coupled with our experience and Herrenknecht’s know-how, the machine was optimally designed for the demanding requirements of the alignment of the Belchen rehabilitation tunnel.”

After completion of the final works inside the tunnel and its commissioning in 2021, the two existing tubes dating from the 1970s will be renovated one after the other so that, as before, two lanes will be available in each direction, north and south, and the traffic can flow unimpeded. When the TBM was launched in February 2016, Jürg Röthlisberger summarized the concept of the project with the words “construction without queues”.

Project data

Herrenknecht TBM constructs large road tunnel in Switzerland



  • Machine type: Single Shield TBM
  • Shield diameter: 13,910 mm
  • Drive power: 3,500 kW
  • Tunnel length: 3,200 m
  • Geology: Gypsum, clay, lime, dolomites, marl
  • Customer: Marti Tunnelbau AG
  • Client: Swiss Federal Roads Office FEDRO


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Herrenknecht AG
Herrenknecht is the only company worldwide to deliver tunnel boring machines for all geologies and in all diameters – ranging from 0.10 to 19 meters. The product range comprises tailor-made machines for traffic, supply and disposal tunnels, technologies for pipeline installation as well as additional equipment and service packages. Herrenknecht also manufactures drilling equipment for vertical and inclined shafts as well as deep drilling rigs.

In 2016 the Herrenknecht Group achieved total output of 1.208 billion euros. The Herrenknecht Group employs around 5,000 people worldwide, including up to 180 trainees. With 76 domestic and overseas subsidiaries and associated companies working in related fields, Herrenknecht provides comprehensive services close to each project and customer.

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