Klauser- and Traunfried Tunnel
A9 Pyhrn Motorway
Autobahnen- und Schnellstraßen-Finanzierungs-Aktiengesellschaft (ASFINAG)
BeMo Tunnelling GmbH (BeMo) (technical sponsor)
50% in JV with Wayss & Freytag Ingenieurbau AG (commercial sponsor)
Klaus a. d. Pyhrnbahn, Austria
Start of construction
End of construction
Project total value
31.3 million €
Northern Limestone Alps
Mainly carbonate rocks of the middle and upper Trias.
Predonderant nature of mountain:
Hillside debris/rubble (little in portal area); dolomite (ranging from low to heavily fragmented), Limestone (bulky up to heavily fragmented);
Shale / clay marl,
Completion Tunnelkette Klaus:
Completion of the A9 Pyhrn-motorway with creation of the tunnels Klaus and Traunfried, construction of the tunnel entrances and adaptation of the service turnaround lane Pertlgraben.
Tunnel Klaus Easttube total length: 7,106 ft/2,166 m
Intermediate heading Frauensteinerstraße North Portal, Open cut tunnelling North (91+229 ft/28+70 m), Cut & Cover method (36 m/118 ft), Mining technique (1,857m/6,092.5 ft), tunnelroof already driven (emergency escape), bench and invert excavation, interior works
Tunnel Traunfried Easttube total length: 2,467 ft/752 m
Roof, bench and invert excavation, interior works
In addition: Electro-technics, remodelling of the Klaus elevated tank, fire water supply, operating stations and collectors, water pollution control facility
The bridges (lots 1-3) and road works (lot 7) are built either in advance or simultaneously to the tunnel objects.