<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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Karawankentunnel - Restoration

Investigation and evaluation of the condition from a rehabilitation needed railway tunnel

Project:

The Karawankentunnel is about 111 years old and an important railway link between Austria and Slovenia. The tunnel is also part of the Trans-European Network (TEN-T-Network).

The tunnel with two rail tracks has a length of about 7,974 m, with 3,601 m on Slovenian territory (approx. 45%) and 4,373 m on Austrian territory (approx. 55%). Rosenbach is the last railway station in Austria and Jesenice is the first one in Slovenia.

The gauge of the existing railway tunnel is inadequate concerning modern standards of the European railway network. Furthermore standards of safety requirements and worker protection legislation are not met anymore. Also structural conditions of the tunnel are deficient in parts (for instance drainage system, stone masonry tunnel lining).

To meet the requirements of worker protection legislation and to improve the structural and safety conditions several activities are planned:

Engineering geological, hydrogeological and geotechnical investigations
Retrofitting of tunnel: repair / strengthening of tunnel lining, sealing works against groundwater inflow and ice formation
Retrofitting of railway line: dismantling of one rail track, renovation of superstructure, retrofitting of overhead contact line, implementation of a new tunnel safety concept, renovation of signal- telecommunication- and energy system
Investigation for 2nd tube

Services of 3:

Engineering geological, hydrogeological and geotechnical investigations:

Review and evaluation of available documents
Site inspection and documentation of present state
Design of site investigation measures (core and percussion drilling, trial pit excavation, sampling, laboratory tests)
Site supervision during execution of site investigations
Collection of groundwater samples and samples of tunnel support elements (mortar, masonry, shotcrete)
Evaluation and interpretation of investigation results
Classification of tunnel lining regarding rehabilitation requirements
Reporting in German and Slovenian laguage

Location: Rosenbach/Jesenice, Austria/Slovenia

Time Period: Since 2016

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