16.11.2006

New tower crane derrick from Liebherr

Whenever we publish a picture of a large tower crane located in the core of a skyscraper, we inevitably receive emails asking “how do they get the crane down when the building is finished?”

We usually explain that a rooftop crane lifts the tower parts down, then a smaller crane lifts that one down and so on, until one with small enough components to travel down in an elevator or hoist is reached.

In order to improve and simplify the process, Liebherr has introduced the 200 DR 5-10 Derrick. This special luffing jib crane is designed to adapt to the tops of most tall buildings, thanks to its articulated extendable base which can be configured for optimum transfer of stresses into the buildings structure.
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The new 200DR 5-10 derrick crane for dismantling internal climbing tower cranes from high buildings

The derrick has sufficient lift capacity and height to handle tower cranes up to the 300 metre/tonne range and can be configured with up to 25 metres of radius at which it can lift 7.5 tonnes, while it will cope with 10 tonnes at up to 20 metres radius.

The 200DR 5-10 is equipped with two stiff leg supports, although it can also be configured without them. The hoist gear is designed to cope with heights of up to 320 metres on two falls of cable.

Once the tower crane has been lowered to the ground, the derrick can
Dismantle itself using is short mast to lift jib sections down, all components break down to a maximum size of 2.2 x 1.1 metres and a weight of 1,000 kgs

A small forklift and workshop crane are also provided as part of the package.