The Koralm Tunnel forms the centerpiece of the Koralm Railway between Graz and Klagenfurt. This railway line is part of the Baltic–Adriatic Railway Corridor and reduces the travel time between the Styrian and Carinthian capitals from 3 hours to just 45 minutes.
Main works included
Installation of temporary facilities for ventilation, communication, and construction power supply
Construction of 65.8 km of Slab Track (Porr system), including 6.5 km as a mass-spring system (approx. 38,700 m³ of concrete)
Construction of a 2.0 km approach section in ballast superstructure
Construction of 65.8 km of service and shoulder paths (approx. 123,850 m³ of concrete)
Construction of 119.6 km of drainage system
Construction of ventilation buildings and outdoor facilities East and West
Completion of the East and West portals as well as the East and West portal buildings
Project services
General construction site services
Operation of installations
Establishment and dismantling of construction sites (East and West)
Site offices for the client (East and West)
Test section
Logistics and safety
Safety management – safety control centers
Logistics coordination – logistics control center
Temporary works
Cooling and ventilation
Construction communication
Power supply and lighting
Access control and personnel tracking
Sanitary facilities
Structural works, service and cable paths
Construction of central shafts
Installation of cable protection routes (cable ducts)
Construction of service and shoulder paths
Superstructure
Construction of Slab Track
Construction of mass-spring systems
Installation of drainage
Preparatory works for technical equipment
Drilling/mounting of cable support fixings
Overhead line installation works
Delivery/drilling/mounting of overhead line supports
Civil engineering
Construction of ventilation buildings East and West
Construction and completion of the East and West portals as well as the West portal building
Outdoor facilities
Construction of outdoor facilities for ventilation buildings East and West
Construction and adaptation of the GSA East and West
Works on the L145 road
Open track
Construction of approach sections in ballast superstructure
