25/09/2025
Soletanche Polska: Foundation Works for Phase IV of the Kraków Tram Completed!
Phase IV of the Kraków Fast Tram will be a new double-track tramway linking residential districts in the northern part of Kraków with the city center. The total length of the line will be 4.5 km, including 1.23 km of tunnel. The works carried out by Soletanche Polska include the construction of diaphragm walls totaling approximately 2.5 km in length, with a maximum depth of 21 meters.
The foundation stage of the fourth section of the Kraków Fast Tram (KST) is coming to an end. In late May 2025, the final segment of diaphragm wall was completed. With this milestone, the entire 1.23 km tunnel is now secured with permanent underground structures. Final works are now underway in preparation for the next phase: installation of tracks and technical systems.
Large-scale Geotechnical Works
The geotechnical works were carried out by Soletanche Polska, commissioned by the main contractor Gülermak, on behalf of the project investor, the City of Kraków – Kraków Municipal Road Authority (ZDMK).
Excellence in Underground Engineering
Soletanche Polska’s scope of work included the construction of diaphragm walls along the underground tunnel and at two underground stations – Polsadu and Młyńskie Roundabouts.
Key Elements Delivered as Part of the Geotechnical Works:
- 2.5 km of diaphragm walls, 0.6 to 1 meter thick and up to 21 meters deep,
- 12 ground anchors beneath the roof of Polsadu Station,
- a system of temporary steel struts,
- foundation barrettes with temporary slab supports,
- cut-off walls to protect against groundwater pressure.
A Major Technical Challenge
One of the most complex stages was the construction of diaphragm walls beneath the operational General Mateusz Iżycki Flyover.
“The available clearance was extremely limited – only 7 meters from the ground to the underside of the flyover beams,” explains Justyna Żabka, Project Manager at Soletanche Polska.
“To safely and precisely install walls 80 cm thick to a depth of 21 meters, we brought in specialized equipment from France and Germany.”
To ensure full safety, the flyover and surrounding buildings were monitored using the Sixense inclinometer system, allowing real-time tracking of structural behavior and ground movements.
A New Route for a Modern City
Phase IV of the KST project will add 4.5 km of new tram tracks, directly connecting Kraków’s northeastern districts with the city center. It will enable shorter travel times, improved public transport connectivity, and reduced road congestion.
Congratulations to the teams!
