Abstract: The invention relates to a crane comprising a movable undercarriage, a superstructure mounted rotatably on the undercarriage, a boom connected to the superstructure in a luffable manner, a derrick boom connected to the superstructure in an articulated manner, via which the boom is braced, a crane control system, a guide connected to the superstructure, and a derrick ballast. The derrick ballast comprises a ballast plate for stacking ballast elements, which is connected to the derrick boom via the ballast bracing and to the superstructure via the guide, as well as a ballast wagon. The ballast wagon comprises a standard heavy-load transport device with its own drive and drive control. According to the invention, the guide is connected to the ballast plate or the ballast wagon via a connection device which comprises a measuring device and is configured to detect a force which counteracts a relative movement between the ballast wagon and the guide.

Abstract: The invention relates to a foldable suspended-ballast guide for a crane with suspended ballast, comprising at least two lattice pieces which are pivotally connected to each other by means of at least one swivel joint, and a swivel drive for changing the swivel angle or for changing the ballast radius, wherein the suspended-ballast guide can be arranged on the crane via the first lattice piece, characterized in that the second lattice piece comprises at least one kink joint in order to kink the second lattice piece downwards or backwards in the direction of the crane to reduce the ballast radius.

Abstract: The invention relates to a foldable suspended-ballast guide for a crane with suspended ballast, comprising at least two lattice pieces which are pivotally connected to each other by means of at least one swivel joint, and a swivel drive for changing the swivel angle or for changing the ballast radius, wherein the suspended-ballast guide can be arranged on the crane via the first lattice piece, characterized in that the second lattice piece comprises at least one kink joint in order to kink the second lattice piece downwards or backwards in the direction of the crane to reduce the ballast radius.