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Contractors World  -
2014 Vol 5 No 5
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Wolff cranes 6531.12 from Wolffkran Belgium

Towering high in Brussels

The city of Brussels has a new eye-catcher: At 140 meters, the UP-site highrise building on the banks of the Charleroi-Brussels-Canal is the tallest residential building in Belgium and one of the highest in Europe.

The construction company, BPC Brabant, hired two Wolff cranes 6531.12 from Wolffkran Belgium, which have made sure that the skyscraper grew to its ultimate height.

Quentin Guyaux, site manager at BPC Brabant:

Right from the very beginning, Wolffkran worked closely with our engineering office with their accurate planning and sophisticated crane concept. There are only a few players on the Belgian market that can draw up plans for this building height and at the same time provide us with what we need in terms of product technology. With Wolffkran we get everything from one source.

Proven Wolff climbing units ensure time-saving climbingProven Wolff climbing units ensure time-saving climbing

The first Wolff 6531.12, with a jib radius of 30 meters, was installed on site using a 300 ton mobile crane to a freestanding height of 91.2 meters at the beginning of the project.

Placed on foundation anchors to save space, it then climbed upwards step by step alongside the growing high-rise building to its final height of 146.4 meters.

The time required for climbing the crane was kept to an absolute minimum due to the efficient Wolff pin connection system and the external climbing unit, which pushes up the crane by 4.5 m (the length of a tower section) in just one go.

The second Wolff, of the same model, but with 45 meter jib, was installed three months later on a cross frame to a free standing height of 65.4 meters and then rose up with the building up to 147.5 meters.

Both trolley jib cranes were equipped with a 75 kW hoist winch, lifting steel girders, formwork and other material with a speed of up to 230 m / min. With maximum lifting capacities of up to 10.4 tons at a 30-meter jib radius and 7.4 tons at a 40-meter jib radius, even heavy pre-fabricated elements were lifted with ease.

One crane required two ties, the other was tied to the building three times. The work of the two Wolff cranes on the UP-site building was completed earlier this year. The Wolffkran team also designed the dismantling of the cranes to be as efficient as possible.

The lower of the two Wolff 6531.12 was dismantled by the higher crane, making the use of a mobile crane obsolete. The higher Wolff crane was climbed down to about 40 meters and then completely dismantled using a 150 ton mobile crane.

Frédéric van Hoorebeke said:

There is a very high demand for our cranes in Belgium. Upon dismantling the two cranes at the Up-site project, they were immediately put up on other construction sites in Brussels and Antwerp.

 

Wolffkran

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