There is provided a crane that is assemblable and disassemblable and is capable of changing a monitoring range for periphery monitoring according to an assembly state of the crane.

There is provided a crane that is assemblable and disassemblable and is capable of changing a monitoring range for periphery monitoring according to an assembly state of the crane.

Described is ballast for a rotary tower, comprising: a main body (10), equipped with coupling means designed to allow a connection to the rotary tower; a detecting device (11, 12, 13), associated with the main body (10), designed for detecting the presence of an obstacle positioned at a distance less than a predetermined safety distance from the main body (10), and for emitting a proximity signal, signifying the presence of an obstacle at a distance less than the safety distance from the main body (10).

A counterweight mounting device, which is installed on a frame supporting a counterweight according to an aspect of the present invention, includes a first link of which a lower end is coupled to the frame so that the first link is rotatable about a first hinge shaft, a second link including a slot guide into which a second hinge shaft coupled to an upper end of the first link is inserted and in which the second hinge shaft slides, a hydraulic cylinder of which a lower end is coupled to the frame so that the hydraulic cylinder is rotatable about a cylinder rotation shaft and an upper end is coupled to the second hinge shaft and rotates the first link, and a connection member installed on an upper end of the second link and connected to the counterweight.

Ballast for operating machines, having a portion removably couplable to a hooking seat of the operating machine, characterized by having a fixed part is provided. The couplable portion, a movable part and means for constraining the movable part to the fixed part at a plurality of distinct distances (D, D′, D″) from the fixed part are provided, so as to change the center of gravity position of the operating machine.

Ballast for operating machines, having a portion removably couplable to a hooking seat of the operating machine, characterized by having a fixed part is provided. The couplable portion, a movable part and means for constraining the movable part to the fixed part at a plurality of distinct distances (D, D′, D″) from the fixed part are provided, so as to change the center of gravity position of the operating machine.

The disclosure relates to a crane (200) for erecting a tower including a plurality of tower segments (171, 72, 173, 174, 175), the crane (200) comprising: a telescopic mast (210), and a jib (230) rotatably mounted with respect to the telescopic mast (210) and comprising lifting equipment (240). The telescopic mast (210) comprises a lower mast segment (211) having one or more lower clamp assemblies (202, 204) for selectively gripping portions of the tower and a roller assembly (300) for rolling along the tower, and comprising one or more further mast segments (212, 213, 214, 215, 216) having an upper clamp assembly (206) for selectively gripping portions of the tower, the further mast segments (212, 213, 214, 215, 216) being slidable with respect to the lower mast segment (211). The disclosure also relates to methods for climbing a tower with a crane (200) and methods for mounting a wind turbine tower.

A system for determining a lifting capacity of a pipelayer is provided. The system includes a load sensor configured to generate a signal indicative of a load suspended from a lifting hook, an angle sensor configured to generate a signal indicative of an angular position of a chassis relative to ground surface, a boom position sensor configured to generate a signal indicative of a position of a boom relative to an undercarriage, and a counterweight position sensor configured to generate a signal indicative of a position of a counterweight relative to the undercarriage. The system further includes a controller configured to receive the signal from each of the load sensor, the angle sensor, the boom position sensor, and the counterweight position sensor. The controller is also configured to determine the lifting capacity of the pipelayer based, at least in part, on the received signal.

A system for determining a lifting capacity of a pipelayer is provided. The system includes a load sensor configured to generate a signal indicative of a load suspended from a lifting hook, an angle sensor configured to generate a signal indicative of an angular position of a chassis relative to ground surface, a boom position sensor configured to generate a signal indicative of a position of a boom relative to an undercarriage, and a counterweight position sensor configured to generate a signal indicative of a position of a counterweight relative to the undercarriage. The system further includes a controller configured to receive the signal from each of the load sensor, the angle sensor, the boom position sensor, and the counterweight position sensor. The controller is also configured to determine the lifting capacity of the pipelayer based, at least in part, on the received signal.

Described herein is a lifting beam system and method for using the same. The lifting beam system includes an elongate platform, a block, and a first and second cable for suspending the elongate platform from the block. The block for connecting the lifting beam system to a lifting device. The length of the second cable extending between the elongate platform and the block being adjustable by a winch. By adjusting the length of the second cable, the elongate platform may be leveled after a load is applied to one end of the elongate platform.