Liebherr-Werk Biberach Gmbh

Christoph Eiwan

Thomas Herse

Martin Assfalg

Norbert Stanger

Simon Holl

Gerhard Katein

Maik Glede

The present invention relates to a method for weathervaning of a crane which has a boom which can rotate about a vertical axis, a slewing gear motor and a slewing gear service brake for securing the boom in a rotational position with a securing torque in the crane mode, wherein in the case of a crane which has been out-of-operation, the boom is braked against rotation with an out-of-operation mode braking torque which is less than said securing torque in the crane mode. In this respect, the invention also relates to such a crane itself, in particular in the form of a revolving tower crane. In accordance with the invention, the out-of-operation mode braking torque is kept at least approximately constant over the range of the speed of rotation and over the range of the angle of rotation of the boom.

Crane and method for weathervaning such a crane

The invention relates to a method for operating multiple cranes (), the movements of which are monitored for imminent collisions by anti-collision devices of the cranes, and to cranes comprising at least one movement device for moving a crane element, a control unit () for actuating the movement device, and an anti-collision device () for monitoring the crane movements of the crane element for possible collisions with another crane. According to the invention, in the event of an imminent collision between a first crane () being operated and a second crane () which is not being operated, the first crane is stopped; a remote control connection () is established from the first crane to the second crane; the second crane is moved out of the collision region (), which is interfering with an intended movement of the first crane, by means of control commands, which are provided at the first stopped crane and transmitted to the second crane by the remote control connection; the second crane is stopped after being moved out of the collision region by remote control; and the first crane is started up again so that the first crane can carry out its task.

Crane with anti-collision device and method for operating multiple such cranes

The invention relates to a method of weathervaning a work machine in out-of-operation mode, in particular of weathervaning a revolving crane/revolving tower crane or a concrete spreader mast, wherein the work machine comprises at least one slewing part that is rotatable about a substantially vertical axis by means of a slewing gear, and wherein in a first step one or more wind data are measured by means of a measurement system arranged at the work machine; an optimum position of the slewing part is determined for an optimum weathervaning in dependence on the detected wind data; and the slewing gear drive is subsequently correspondingly actuated to bring the slewing part into the determined position.

Method for bringing a work machine into a weathervane position, and work machine for carrying out the method

The invention relates to a tower crane comprising a tower of at least one tower element, in particular a lattice piece, and a structural guying device having at least one guying rod for the horizontal anchorage of the tower at a structure. In accordance with the invention, the tower has a vertically adjustable guide frame, wherein at least one positioning rope is adjustably fastened to the guide frame. The invention furthermore relates to a method of mounting a wind turbine rotor blade.

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Ummendorf, Germany

Christoph Eiwan