A new motorway is under construction that is designed to improve the infrastructure between Bosnia and Herzegovina as well as Croatia. The project forms part of the 5c Pan-European Transport Corridor and is an important prerequisite for ensuring the positive economic development of the whole region.
Construction work on the motorway also included the 2.9 km long Vijenac Tunnel in Bosnia. Work on the double tube highway began in July 2011, and the tunnel has been completed in 2014. Tunnel advance was carried out in accordance with the New Austrian Tunnelling Method.
DSI Austria supplied the complete range of important ground control products for tunnel driving. This also included hollow bar rock bolts including accessories as well as grout pumps. The DYWI® Drill Hollow Bar System proved itself by fulfilling the following technical characteristics in this project:
- Simultaneous drilling and grouting ensures an optimum bond between the hollow bar tendon and the unconsolidated rock or ground
- The construction soil is improved by the infiltration of the grout into the surrounding unconsolidated soil
- Uniform distribution of the grout along the complete installation length
The advantages of the hollow bar system had already convinced the client in comparable projects. Principal advantages include the fast and safe self-drilling installation process as well as the possibility to drill, install and grout in a single operation using standard drilling equipment.