Synchronous lifting technology was used in Europe recently to hoist a bridge. The Akkerwinde bridge in the Netherlands is both an aesthetic landmark and a functional heavy traffic bridge, capable of accommodating vehicles of 60 tons or more. The synchronous hydraulic technology from Enerpac was used to hoist the bridge.
Enerpac’s synchronous hydraulic technology used on Australasian projects ranging from bridge and machinery lifts to splitting a mining dragline for maintenance was used to lift the structure and to position it without internal stresses.
The big wooden, Akkerwinde bridge weighs 360 tonnes and spans the A7 national trunk road near Akkerwinde in Sneek. The bridge was lifted more than five metres using Enerpac's digital synchronous lift system to position it correctly, completing the first phase of the Rijksweg 7 Sneek project.
The full project consists of two wooden bridges over the new southern A7 ring road, commissioned by the province of Friesland, Rijkswaterstaat Noord Nederland (Ministry of Waterways and Public Works for the northern Netherlands) and the Municipality of Sneek.
As part of the first phase, a new bridge was placed in the Akkerwinde location. The second bridge is planned for the Molenkrite area. The new bridge is the first wooden bridge of this size to be constructed anywhere in the world for all forms of traffic.
The new bridge's deck and arches were prepared on an assembly site about one-and-a- half kilometres away from the bridge's current location over the A7. After assembly, the bridge was lifted to the correct height for its final position, using Enerpac's computer-controlled hydraulic synchronous lift system.
Four Enerpac Stage-Lift cylinders (type BALS2506E100), each with a capacity of up to 250 tonnes, were placed on hardwood outer cribbing blocks, which were stacked diagonally layer for layer. The bridge was lifted around 50cm/hr, and in the end the whole construction rested on four cribbing block towers, each approximately four metres high.
Each cylinder was connected to its own hydraulic pump unit, which was controlled by computer using sensors placed right next to the lift cylinders. The computer programme controlled the cylinder movements, independently of the measurements, by switching the hydraulic directional control valves. During this control phase, short impulses are sent to the valves in fractions of a second, so that individual cylinder movements are kept much smaller than is possible using manual control.
Wagenborg Nedlift system involved in the project saved time. The synchronous lift system allowed them to manage and monitor the whole operation.
Enerpac’s synchronous lifting systems have been used in many major projects, including the construction of the world’s highest bridge, the 343m high Millau Viaduct, in France.
Enerpac’s synchronous lifting system’s lifting capacity and safety has been employed globally, from the construction of North Sea oil rigs to the splitting of a 3,500 tonne coal mine dragline at Curragh in Queensland, Australia, as well as lifting of bridges and structures during construction and maintenance. Its delicate precision was used in the construction of the Australian Navy’s new Collins Class submarines.
Enerpac’s synchronous lifting systems are available in configurations from 4 to 64 lifting points. Synchronous lifting systems electronically control and monitor movement during the hydraulic raising, lowering, positioning or testing of heavy objects such as manufacturing machinery, motors, manufactured structures, buildings, bridges, oil platforms, ships, turbines, generators, mills, mining equipment and heavy but delicate computerised/electrical equipment.
The premium version of Enerpac’s computer-controlled Enerpac synchronous hydraulic lifting system can be used with multiple cylinders ranging from 10 to 1000 tonnes capacity each. This system uses digital synchronisation control accurate to within a 0.1mm between leading and lagging lifting points. Operating through PLC control with touch-screen simplicity, the 700-bar system offers stroke to balance complex and sometimes delicate and hazardous structures.
Enerpac’s synchronous lifting system overcomes internal stresses avoiding hidden damage, and does not compromise serviceability and safety.