All terrain crane

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All-terrain crane in action
normal truck crane

The all-terrain crane , or AT crane for short , is a special form of the vehicle crane . The AT-cranes , due to their use manner always a chassis with wheels.

development

The conventional truck cranes were usually not all-terrain enough to reach many locations, and the all-terrain low-speed cranes (the so-called rough terrain cranes ) did not have the mobility required to reach or change locations quickly. The use of these cranes was therefore severely restricted or associated with very high costs.

All-terrain cranes were developed to combine the advantages of both types of crane in one vehicle. Due to the successful combination of both capabilities, AT cranes represent the majority of large mobile cranes today.

construction

Use of an AT crane when assembling a prefabricated house

The crane structure resembles the normal truck cranes as much as possible, only the chassis of the vehicles has mostly been reinforced in order to be able to move the heavy crane safely through the site. The axles of the AT cranes can usually be steered and blocked independently of each other, so that tight turning circles or the crane can be moved almost sideways. The trolleys usually have hydraulic suspensions with level control to enable safe locomotion even in rough terrain. The drive power has been greatly increased in relation to the truck cranes and today it can reach up to 500  kilowatts .

The boom is constructed either as a telescopic mast, a lattice mast or a combination of both systems. With the most powerful systems such as the Liebherr LTM 11200 , working heights of almost 200 meters and load capacities of up to 1200 tons are achieved today.

Individual evidence

  1. Technical data of the LTM 11200 on the Liebherr website (PDF file, 7,045 kB, viewed on August 31, 2011)