The preparatory work has already proved to be extremely demanding: a total of 794 jet grouting columns were constructed to improve the mechanical properties of the soil in the alluvial zone, as well as a “Parisian wall” consisting of piles (1’186) and nails (12’595). For the excavation of the "spandrel zone", 290,000 tons of material were excavated – a total of approximately […]

With razor-sharp precision, Implenia has blasted our way down to about 15 metres below ground level, with residents and the 140-year-old station building above. The blasting works was carried out in two stages and despite the challenges with the narrow construction site it was done with great success. The pit will eventually become part of the 300 meter long concrete tunnel, […]

Since leaving the launch shaft in November 2019, Coline has covered two kilometers, laid 1100 precast segments and excavated more than 500,000 tons of material, 50,000 tons of which is recycled directly on site, saving more than 2,000 truck journeys (seven trucks full time). There are still 400 meters to go before it reaches its final destination, the "Orsel" shaft, the […]