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Picture of a tunnel
Picture of a tunnel © STRABAG Infrastructure & Safety Solutions GmbH

Client
ASFiNAG Bau Management GmbH

Place of performance
Klaus an der Pyhrnautobahn, Austria

Execution period
Construction phase 1: 06/2016 – 10/2017
Construction phase 2: 10/2017 – 02/2019

Contract value
€ 31.8 million

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A9 Tunnel Chain Klaus

The Klaus Tunnel Chain is a section of the A9 Pyhrn Motorway in Upper Austria that was equipped with electromechanical systems by STRABAG Infrastructure & Safety Solutions between 2016 and 2019.

To further enhance traffic safety, the four existing tunnel tubes (Klaus, Traunfried, Spering, and Falkenstein) were comprehensively refurbished and the four newly constructed tubes were outfitted with electromechanical equipment. In total, approximately 12.5 kilometers of tunnel, six operation buildings, seven electrical niches, and one cavern were equipped by STRABAG Infrastructure & Safety Solutions.

The project also included the installation of the CN.as line (excluding earth works) between the Kienberg Tunnel and the Roßleithen junction, including the connection and expansion of existing open-air systems. Additionally, the medium-voltage switchgear (control and protection devices) between the Tretter Tunnel and the Roßleithen Tunnel was renewed as part of the project.

Services in Detail

STRABAG Infrastructure & Safety Solutions was the general contractor for the following electrical engineering works:
  • Traffic infrastructure & control
    • Control system incl. data transmission equipment
    • Traffic data collection
    • Traffic control system incl. traffic sign supports
    • Video surveillance incl. Acoustic Tunnel Monitoring (AKUT)
  • Sensors
    • Monitoring the air conditions
    • Measuring devices for the extinguishing water system
    • Measuring devices for the water protection system
    • Environmental data acquisition system in the open field
  • Various electrical systems & installations
    • Tunnel and street lighting
    • Radio system for secure communication within the tunnel and with the outside world
    • Ventilation system in the tunnel, building ventilation and air conditioning
    • Emergency call facilities
    • Public address system
    • Hazard alarm system
    • Building and niche installation
  • Energy supply & distribution
    • Medium-voltage system 20kV & low-voltage system
    • Safety power supply
    • Earthing and equipotential bonding
    • Cabling
  • Structural measures & constructions
    • Doors and gates
    • Fire barriers
    • Pipe and support systems, various constructions
  • Maintenance

    Furthermore, STRABAG Infrastructure & Safety Solutions will provide long-term maintenance for the installed electrical systems (planned for 6 years). This guarantees the basis for safe operation of the tunnel system by ASFINAG.