Two big road tunnels are under construction by German contractor Walter Bau in the Czech Republic.
The 1.7 km long Dlzschen tunnel and the 2.3km Coschutz are both three-lane, twin tube tunnels.
They are key parts of the new A17 motorway which takes the autobahn 200km from Prague in the Czech Republic to Dresden in eastern Germany.
Eight Atlas Copco Boomer 352 drilling rigs and Swellex rock bolts are being used to stabilise ground as the tunnels advance. The rigs are fitted with COP 1838 rack drills, used to cover face drilling, rock bolting and tunnel roof umbrella drilling. The 4m long Swellex bolts are used where rock support is required.
As a key section of the European Union's trans-European road network, the new motorway is considered one of the most important road projects now under way.
The tunnels are due to be finished by June 2002 and the entire autobahn is expected to be open by June 2003 INFOPLUS www. atlascopco. se/re