<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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Flachgauertunnel

Seekirchnertunnel: double tube – single track railway tunnel with a length of 14.37 km, about 13.33 km driven by TBM and NATM.

Grafenholztunnel: double tube – single track railway tunnel with a length of 2.09 km, about 1.14 km driven by NATM.

Project:

The Flachgauertunnel, with a total length of 16,502 m, consist of two tunnels (Seekirchnertunnel, length: 14,502 m, Grafenholztunnel, length: 2,087.5 m). Both tunnels are connected by a tunnel-bridge crossing the river Fischach (length: 44.5 m).

The selected alignment (total length: approx. 21.08 km) diverts from the existing ÖBB-railway track at the Köstendorf curve, circumnavigates the villages Seekirchen and Elixhausen, crosses the river Fischach, underpasses the hill Grafenholz and joins the ÖBB-track again at Kasern, a northern suburb of the City of Salzburg.

The Flachgauertunnel is designed as a single-track double-tube tunnel. For tunnel construction different construction methods are required, such as cut & cover and concrete slab cover excavation, drill & blast well as TBM (EPB) excavation.

The tunnel has a continuous down slope gradient of 0.8% as a maximum from east-portal of Seekirchnertunnel to west-portal of Grafenholztunnel.

Services of 3G:

Project management with respect to engineering geological tasks
Design of the engineering geological investigation programs
Engineering geological field mapping
Supervision of the investigation works and core logging
Statistical evaluation and analysis of structural data
Engineering geological and geotechnical assessment for corridor and route selection
Rock mass characterization
Geological-geotechnical modelling and prediction
Investigation of disposal areas for tunnel muck
BIM – geological ground modelling
Report with respect to corridor and route selection process and environmental impact study (UVE in progress)

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