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Contractors World 2012 Volume 3 Issue 2
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Ukraine

Cost-effectively forming geometrically challenging twin suspension towers

In Zaporozhye, the industrial metropolis in Ukraine’s southeast, a multi-lane cable-stayed bridge is being built alongside an older viaduct. On completion, this large-scale infrastructure project will massively reduce the traffic burden on the existing bridge and significantly improve the daily traffic situation at this major river crossing.

The two separate roadway slabs are cable-stayed off twin H-shaped suspension towers 150 metres high. The project-management team of lead contractor Mostobud opted for an automatic climbing formwork solution from Doka for the two suspension towers. The crunch factors were the history of smooth cooperation on previous builds, topped by Doka’s competence on technologically challenging automatic climbing projects.

    Cost-effectively forming geometrically challenging twin suspension towers

In terms of formwork adaptability the demands were tremendous, because the inclination of the tower legs changes over their height and the structures taper upward, but Doka’s automatic climbers worked to the project owner’s complete satisfaction and without time-consuming adaptations as the build progressed. For the sake of strength, the two towers are of solid cross-section to the full height of the first two concreting sections.

The section is hollow from the 11-metre level up. Per tower leg there are eight SKE50 automatic climbers carrying 100 m² of Doka Top 50 beam formwork, plus a set of Doka shaft formwork, that is being repositioned with a single lift of the crane.

“The Doka formwork has proved the perfect solution for building the two suspension towers quickly and economically. The formwork units are climbed very rapidly using hydraulic cylinders and the forming up and stripping out routines are straightforward, two factors that contribute enormously to speedy progress on this build“, asserts Project Manager Volodymyr Klymenko, succinctly summing up the positive experiences gained with the automatic climbing formwork on the project.

Mostobud’s project-management team is also impressed by the high safety standard of the Doka automatic climbers. “The climber scaffolding is permanently anchored in the concrete, so even in high winds it is safe to climb the platforms. The working platforms are wide and protected all round and as well as that the ladders are firmly integrated into the climbers to ensure safe working conditions”, explains Project Manager Volodymyr Klymenko. A safety net safeguards all four platform levels to complete the comprehensive safety concept.

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Page updated: February 2012

 

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