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Landmark suspension bridge takes shape with help of Potain

Two MDT 128 topless cranes from Potain are playing a crucial role in the construction of the Hardanger Bridge in Norway set to be one of the longest suspension bridges in the world. The 6 t cranes are placing suspension cables and making other lifts at the top of one of the bridge’s pylons where working heights exceed 200 m. 

The cranes are owned by Ajos a leading crane rental company and the Potain dealer for Denmark. Ajos supplied the cranes to MT Hojgaard one of the largest contractors in Scandinavia. The company also provided two of its most skilled operators to the project whose ability to control the lifts in harsh working conditions enables the job to keep moving ahead on schedule.

The exposed site means the Potain cranes have no protection from the harsh Scandinavian weather where temperatures fall as low as –40˚C and wind speeds can reach up to 217 km/h. Such extreme conditions mean the cranes enter out of service conditions but even when temperatures rise and wind speeds fall to acceptable levels for operations maintaining lift schedules on the project remains a challenge. Work is continuing 24 hours a day on the job meaning highly durable equipment is required plus the latest lifting technology.

For the Hardanger job the MDT 128 cranes have been fitted with Potain’s powerful 50 LVF GH Optima winch and both are working with four falls of wire rope. This configuration allows the cranes to lift their maximum capacity and also allows both high-speed hook operation and more precise movements when placing loads in their final position. The cranes are currently configured with 35 m jibs.

Assembling the cranes presented a challenge as steep valley walls lead down to the base of the pylon and minimal space is available at ground level. The two Potain cranes were erected after the main support towers for the pylon had been built by an existing tower crane that was unable to climb any further. The cranes are located on a platform half way up the pylon meaning that they cannot be reached from ground level and will have to be dismantled by helicopter.

Jørgen Egede Saabye technical manager at Ajos said the MDT 128s were performing well and have needed no attention aside from regular maintenance.

“We service the cranes every two months and they have the durability and reliability to handle the demanding workload in a very hostile environment ” he said. “This is a high-profile project on a tight schedule and when you’re working this high up you need to have confidence in your equipment. With these MDT cranes we have that.”

Located over Hardangerfjord near Bergen in south-western Norway the €300 million Hardanger Bridge will span 1 310 m – 20 m longer than the Golden Gate Bridge in San Francisco. Construction began in early 2011 and is scheduled for completion in 2013.

Cristelle Lacourt
Manitowoc Cranes
+33 472 182 018
cristelle.lacourt@manitowoc.com
 
Ronan Cloud
SE10
+44 207 107 2008
Brand

POTAIN

Potain tower cranes are known around the world for their lifting power, reliability and innovative designs. Potain builds more than 60 types of tower cranes to fit a wide variety of job sites: high capacity top slewing cranes on infrastructure jobs, luffing jib cranes that construct “supertall” skyscrapers, topless cranes reshaping our urban environment and Hup self-erecting cranes transforming residential construction. Known for their ease of use, efficient transport and quick erection times, there are many reasons why Potain tower cranes dot skylines across the globe.
Range

Top-Slewing Cranes

Top-Slewing cranes are the large construction sites most strategic equipment for productivity. Whether on large infrastructure, high rise jobsites, crowded urban areas or wide open sites, they make it possible to hoist and distribute loads high and far. The Potain brand is a global leader with its multiple ranges of topless cranes, luffing jib cranes and large hammerhead cranes that can also be customized to match special applications.

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