Underground—EMEA—Greece—Tunneling
The Klokova Tunnel: Ground Support Products by DSI Underground for
Greece’s new North-South Connection
Ionia Odos, which is also known as Aftokinitodromos 5,
is a new, 196km long north-south motorway connecting
northwestern Greece with the Peloponnes Peninsula.
This project also includes the construction of
24 bridges and 4 tunnels. One of the tunnel
structures that had to be advanced is the
2,950m long Klokova Tunnel north of Patras.
The double tube tunnel is being excavated
using the conventional drill and blast method.
To stabilize advancement in the unstable
rock layers in which limestone, sand and
conglomerates prevail, DSI Underground
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Austria produced and supplied several
ground support systems such as rock
anchors for immediate support of the open
span area in the prevailing fault zones.
For immediate temporary support, DSI
produced and supplied 4.0m to 4.5m long
OMEGA-BOLT ® Expandable Friction Bolts.
Bonding forces between the friction bolt and
the rock mass are caused by form closure
and friction transfer between the borehole
wall and the rock bolt that is expanded by
hydraulic pressure. OMEGA-BOLT ® Anchors
reach immediate full load bearing capacity
over the entire installed bolt length and were
especially well suited for use in the Klokova
Tunnel thanks to their low sensitivity against
vibrations caused by blasting work.