Underground: test drillings at Staatsbrücke – salzburg.ORF.at
At the Giselakai and the State Bridge, the test bores for the underground regional light rail were involved. In the spring, the ground between the main train station and Mirabellplatz was explored. In order to choose the route, the rock base of the Kapuzinerberg is now analyzed.
For this geological exploration of the subsoil, these “ramming soundings” are carried out at 15 to 20 points.
Look for hard layers
The aim is to determine the exact location of the underground rock of the Kapuzinerberg, as managing director Stefan Knittel of the regional light rail project company describes: “It is a grid of boreholes where one pipe after the other is rammed into the ground. This means that you then know where the hard layers begin and run. “
The exact route is not yet fixed
It is not yet clear where exactly the underground line will run, connecting the state capital with the surrounding area in the north and in the south to Hallein (Tennengau). It depends on the geology, says Knittel: “One tries to generate a three-dimensional image of the subsurface from this data in order to have this information as precisely as possible. It may be that at one point the effort involved in construction is so great that it is ignored. It can happen.”
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Further drilling also in the south
By the end of the year, the route of the “S-Link” should be determined – as this expansion IS called. Further analysis is necessary for this: “The entire drilling program WILL then also be pulled further south in order to find and designate the layer boundaries and their strengths.”
The construction of the regional light rail is scheduled to begin in early 2023. If all goes well, this 880 million euro project could be completed in two years.