Contractors World International Vol 5 No 5
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 build-
ing 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
The first Wolff 6531.12, with a jib radius of 30 me-
ters, 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 connec-
tion system and the external climbing unit, which pushes
up the crane by 4.5 m (the length of a tower section) in just
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 me-
ters 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 ma-
terial 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-fabri-
cated 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 build-
ing was completed earlier this year. The Wolffkran team
also designed the dismantling of the cranes to be as ef-
ficient as possible.
The lower of the two Wolff 6531.12 was dismantled by
the higher crane, making the use of a mobile crane obso-
lete. The higher Wolff crane was climbed down to about
40 meters and then completely dismantled using a 150 ton
Frédéric van Hoorebeke: “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.”