<h1>Let's go ahead</h1>
<p>Every new project involves striking out into a piece of the future. At 3G we head towards the objective on the basis of mutual trust with our clients and with great enthusiasm for our common cause.</p>
<p><a style='color:#fff;' href='en/about-us/philosophy.html'>Find out more</a></p>

<h1 style='color:#000;'>Let's go ahead</h1>
<p style='color:#000;'>Every new project involves striking out into a piece of the future. At 3G we head towards the objective on the basis of mutual trust with our clients and with great enthusiasm for our common cause.</p>
<p><a style='color:#000;' href='en/about-us/philosophy.html'>Find out more</a></p>

Projects

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Koralm Tunnel - CL KAT 2

The Koralm Tunnel, located between the two Austrian federal capitals of Graz and Klagenfurt, is the core of the Pontebbana axis.

Project:

The Pontebbana axis is a high capacity railway line, linking North-eastern Europe with the Mediterranean region.

The Koralm tunnel project consists of three construction lots: KAT1, KAT2 and KAT3.

The tunnel cuts through the Koralpe mountain range and parts of the neighbouring Neogen basins. The Koralm Tunnel is a double-tube, single-track railway tunnel, length of CL KAT2: approx. 20 km, maximum overburden: 1,200 m. CL KAT2 was started in 2010.

Two overlapping construction shafts. The 60 m deep shafts were constructed from February to August 2011, providing access to NATM and TBM tunnels of CL KAT2

Exploration shaft Leibenfeld is used for ventilation and personnel elevators to the tunnel headings of CL KAT2

Neogen sediments are excavated by NATM. This part of the tunnel has a length per tube of 1,8 km and 2,5 km. At the start of hard rock section assembling caverns for both TBM are situated. Installation caverns were excavated applying NATM technology with a cross sectional area of 380 m² each.

The metamorphic rocks of the Koralpe are excavated with 2 single shield hard rock TBM, outer diameter 9.9 m. This part of CL KAT2 has a length of 15,7 km and 17,2 km respectively.

Tunnel tubes are connected by 39 cross passages and 1 rescue tunnel, all excavated by NATM. The rescue tunnel has a total length of 950 m and a cross section of 62 m²

The excavated metamorphic rocks are processed at the construction site and used as aggregates for production of segmental lining elements.

Services of 3G:

Site supervision for NATM and TBM tunnel sections
Engineering geological and hydrogeological documentation
Support and evaluation of investigation applied systematically ahead of the lead TBM (geophysical exploration, percussion drilling), preparation of short term ground predictions
Geotechnical consulting during construction for excavation concepts, processing of excavated materials, claim defence

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