Bosruck Tunnel: Breakthrough for 2nd Bore

The breakthrough of the second bore for the 5.5 km long Bosruck Tunnel designed for 2 lanes took place on August 11, 2011 after only 17 months of construction. It occurred 2.5 months earlier than scheduled in spite of tricky geology (in the Haselgebirge with anhydrite springs etc.). This was followed by the remaining bench and floor excavation, production of the invert with drainage and creating bays and installing the concrete inner shell followed by the units for the extinguishing water supply, lighting and ventilation etc. The new tunnel bore was produced via drill+blast in accordance with...

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Issue 06/2013 Austria

Bosruck Tunnel: Redeveloping the existing Bore

A second bore was produced by drill+blast using the New Austrian Tunnelling Method (NATM) for the 5.5 km long, 2-lane Bosruck Tunnel on the A?9 motorway. It possesses 2 lanes. After being broken...

Issue 04/2010 Austria

Second Bore for Bosruck Tunnel

The Asfinag as operator of the motorway in Austria has commissioned the construction of a second tunnel bore with 5 breakdown bays and 11 cross-passages (6 of them negotiable with vehicles) for the...

Issue 08/2015 Austria

Twin-bore Upgrading of the Bosruck Tunnel completed

The 5425 m long Bosruck Tunnel between the states of Upper Austria and Styria has been in operation since 1983, and traffic has been running through a new second bore since summer 2013. After thorough...

Issue 02/2016 Austria

Bosruck Tunnel: Repair of the sagged intermediate Slab

After the construction of the second bore completed in 2013 and the subsequent refurbishment of the more than 30 year old original tunnel, the Bosruck Tunnel on the A 9 Pyhrn Autobahn in Austria was...

Issue 03/2015 Austria

Second Klaus Tunnel Bore: Start of Excavation in April 2015

Currently the Klaus chain of tunnels between the Klaus and St. Pankraz/Hinterstoder junctions, the Bosruck and the Gleinalm tunnels, which represent undeveloped gaps on the A9 Pyhrn Motorway, are...