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Delicate hydraulic crown jacking procedure shapes the concrete bowstring arch of Zaragoza’s Third Millenium Bridge

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Enerpac's 12000 tons synchronous hydraulic systems moved the concrete arch and pushed the cantilevers apart to make space for the final casting of Zaragoza's Third Millenium Bridge (Spain)

The success of the Zaragoza's Third Millenium Bridge project depended crucially on the smooth and safe implementation of delicate hydraulic jacking procedure as part of the project's critical path

The crown jacking of the bowstring arch was done using a synchronous system with six 2000 tons double-acting lock nut cylinders controlled by a single PLC-control unit

The custom-designed synchronous system was engineered to push apart and hold the two parts on the top of the arch, leaving the arch totally un-swung. Featuring the highest arch in the world of a fluvial bridge, execution of the project was made possible in large part by the synchronized systems developed by Enerpac's Integrated Solutions centre of Spain

The system imposes a load on the arch of slightly more than 12.000 tons to permit the jacking and closing operation 36 meters above the deck of the bridge

A computer-based synchronization was carried out with specific software developed to take account of roll as the arch opened, while controlling individual loads per cylinder as well as pairs of cylinders

Delicate hydraulic crown jacking procedure shapes the concrete bowstring arch of Zaragoza's Third Millenium Bridge

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