Rapid progress in a 5-day cycle with award-winning PERI solution: The innovative VCT Composite Track ensures swift construction progress

The steel section of the load-bearing bridge section consists of two 2.00-metre-high I-shaped main beams. The main longitudinal and cross girders are made of welded steel sheets of varying thicknesses. The bridge is divided into 13 bridge spans and the carriageway slab was constructed in 52 concreting sections, each approximately 10 metres long. The superstructure is 11.70 m wide to provide sufficient space for traffic. The thickness of the concrete slab varies from 22 cm to 35 cm for ideal weight optimisation.

The VARIOKIT VCT Composite Track makes its début

This overpass project is the first in Croatia to utilise PERI’s VARIOKIT VCT Composite Track. The VARIOKIT VCT Composite Track won the Innovation Award at bauma 2025 in the ‘construction’ category, and its benefits are clearly evident in this project.

This allows the carriageway slab to be manufactured without having to deal with the problematic block dowel effect of the formwork carriage supports that are usually welded in place. Similarly, the VARIOKIT VCT Composite Track does not necessitate any penetrations in the carriageway slab. This eliminates the need for subsequent sealing of the through-holes, significantly increasing the quality and service life of the carriageway slab and contributing to sustainable bridge construction. 

Other local factors also make the composite track the ideal solution. Since only telescopic loaders and a mobile crane are available on the construction site, the hydraulically controlled movement of the composite track is an ideal feature. Once it is mounted on the steel beam, the composite track can be moved forwards or backwards into the relevant concreting sections without the aid of construction machinery.

What’s more, tasks such as installing steel reinforcement or concreting the carriageway slab can be carried out without any obstacles and with free access from above, which significantly speeds up and simplifies the process. By using the VCT Composite Track, it was possible to achieve a concreting cycle of just five days for standard sections with a length of ten metres. With these short cycle times, it is possible to meet or even beat the tight one-year bridge construction deadline.

Conventional challenges are on the decline

The composite track also provides a smart solution to other challenges that arise when constructing in-situ concrete carriageway slabs for steel composite bridges. The hydraulic drive with direction change function enables the composite track to be used to perfection for the classic back-step method. It is possible to simply pass beneath sections that have already been concreted in order to reach the next concreting section. “VCT makes our work so much easier and faster in situations like this. These issues simply don’t exist any more. With VCT, you need not worry about height differences or obstacles. You can just continue working uninterrupted,” says Talha Kaymak, Site Manager at KAMGRAD d.o.o., the company responsible for constructing the overpass.

PERI has assigned a supervisor to assist with the construction work on site, and the construction site team has received comprehensive training on how to use the composite track. PERI’s solution is complemented by additional components from the compatible VARIOKIT Engineering Construction Kit. A total of around 60 tonnes of PERI materials are in use on site. 

The HŽ-2 overpass is a prime example of innovative solutions in modern bridge construction. It is the embodiment of efficient resource use and outstanding engineering, paving the way for long-lasting and sustainable infrastructure.