The top priorities for every structure are quality and durability. The requirements for tunnel operation need to be considered at an early design stage. Particularly, special structures like utility ducts, escape galleries, cross-passages, ventilation shafts and ventilation plants need to be considered in a comprehensive design already at an early stage.
Safety installations, such as smoke extraction ventilation including detection systems and escape routes, shape the design of modern traffic structures. Additionally, emergency lanes and service bays for tunnel users are important project features. As a result of these safety measures, large asymmetric tunnel cross-sections are often necessary, the construction of which is particularly difficult in soft ground.
Existing tunnels must also be improved to meet the continuously increasing requirements. In this case, not only safety and environmental demands shall be fulfilled, but also the probable requirement of the client, to carry out construction works while traffic is moving.
Complex from planning to maintenance
We have gathered our knowledge by building underground roads all around the world and deepened it by closely co-operating with research groups and the industry. This enables us to select the right technology for the particular local requirements.
Our experts work with the most appropriate tunnelling methods, select the correct lining and deliver the optimum alignment. In addition, we develop safety concepts and emergency planning, and design the ventilation for road tunnels.
Signature projects include the Zurich Western and Northern Bypass, the San Bernardino Tunnel, Dobroshevko urban road tunnel, Bruno, the Stockholm Bypass Förbifart, the Suez Canal Road Tunnel and many more.