Makela_Cronvall:Layout 1 19/5/08 11:27 Page 5
NORTHERN EUROPE PROFILE: RHK & VR-TRACK LTD
measurements could be checked practically
in real time.
The construction of the Savio tunnel
was carried out by a number of contractors.
Excavation was divided into five contracts
so that work could be done according to the
fairly tight timetable. Excavation contracts
included the excavation and reinforcement
of the tunnel as well as shafts and access
tunnels and facilities for technical systems.
Excavation work began in September 2003
and was completed in autumn 2006.
Subsequently separate contracts have
covered the installation of structures and
technical systems, superstructure, electrified
line technology and CCS-equipment.
Tunnel structures
Figure 6: Southern portal of the Savio tunnel
The tunnel was built entirely using
the drill and blast method. The quality excavation over a distance of Consequently, a concrete tunnel with a
of the bedrock was mostly fair to good, approximately 300 metres was carried structural thickness of 800mm was built
although a few weak fracture zones were out in stages and the roof of the tunnel over a distance of 230 metres (see Figure 9
encountered along the way. The tunnel was was shored up with preinstalled bolts. on page 36). The structure is under
sealed by cement grouting, galvanised bolts The bedrock in this area was so weak pressure from the layers of soil overhead
and shotcrete were used in reinforcement. that the tunnel could not be built using and approximately 50m water pressure.
In the Myras area, the bedrock was of traditional reinforcing methods and Since the difference in elevation
very poor quality and there were still meet requirements for the service between the portals of the tunnel was
numerous thick clay zones. For this reason life of load-bearing structures. large, gravitational ventilation results in a
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