Cost Effective Cable Stay Bridge Construction With Variokit Balanced Cantilever Equipment 1 From 5

Cost-effective cable stay bridge construction with VARIOKIT balanced cantilever equipment The current expansion of the Krakow metropolitan railway network (KST) requires, among other things, crossing of the Krakow Plaszow railway junction.

Ensuring that daily rail operations remained unaffected during the construction of the 252 m long crossing was a prerequisite which meant the general contractor decided in favour of the cantilevered construction method for realizing the extra dosed bridge with its hollow box cross-section.

In addition, the compatibility with the PERI UP modular scaffolding provided safe working platforms and access means to all working areas.

Through the customized solution devised by PERI engineers, the construction team have been able to realize each 5.70 m long concreting section using 4VARIOKIT cantilevered construction carriages.

Thanks to the high degree of flexibility and easy alignment of the system, complicated pre-tensioning sequences have been implemented in the longitudinal and transverse directions of the viaduct.

Among other things, the tendons as well as the anchorage points of the stay cables outside of the box girders had to be taken into account.

Furthermore, carrying out construction work during daily train operations along with the allocated downtimes has complicated the ongoing completion of the cantilever above the tracks.

Nevertheless, the respective segments can be constructed without any interruptions in 2-week cycles.

After closing the respective gap of the bridge span, the PERI VBC balanced cantilevered carriage automatically returns to its starting position although cable stays are positioned along the structural axis.

As a result, dismantling the equipment is always efficient and safe.

Engineering services and system equipment from one source PERI Poland took on the customized project planning and static calculations of the comprehensive solutions for the superstructure on PERI UP false work as well as the cantilevered construction.