Zürich Cross-City Link

Customer:  SBB AG

Task:  Site management of the ballastless-track installation on the bridges of the Zurich Cross-City Link (Letzigraben and Kohlendreieckbrücke)

Implementation period:   2000 - 2016

Total:  Order costs: CHF 12'000'000 /  Project costs: CHF 280'000'000

The Letzigraben (1156 m) and Kohlendreieckbrücke (394 m) are bridges built as part of the Cross-City Link from Altstetten via Zurich HB to Oerlikon diameter line. Together they form the westwards exit from the new underground Löwenstrasse station.

Construction work began in 2008 with the "relocation" of track sections in the Zurich outer station. From 2009 the first of 23 piers were erected. The piers, which are a maximum of 16 meters high, are based on bored piles that are up to 45 meters long. The bridge superstructure was built using a pushable scaffold that was assembled in autumn 2011. A structural defect required the installation of a slab track from November 2013. This is because six to eight prestressing cables had to be pulled in across the track above each of the 23 piers and fixed on the outside with anchor heads. The prestressing cables laying on the bridge had to be embedded in concrete, which meant that a conventional ballasted superstructure could no longer be installed due to the lack of space. For this reason, a slab track of the LVT system was installed for the first time on a bridge in Switzerland.

 

The SBB commissioned RUBI Bahntechnik for this design variation in the mandate "Site management and specialist slab track". The big challenge was to find a technically feasible solution and to have it approved by the Federal Office of Transport. Furthermore, RUBI Bahntechnik was allowed to carry out the submission of the work and closely monitor the work as site managers. Despite the project change, the bridges were completed in time by the end of 2016.