A pivot-forming crane element for a rotating portion of an element-mounted crane includes a framework on which a motor-driven orienting system, a hoisting winch and a dispensing winch are mounted. The motor-driven orienting system includes a pivot mechanism about an orienting axis and at least one orienting electric motor cooperating with the pivot mechanism to make the framework pivot about the orienting axis. The hoisting winch is provided with a hoisting electric motor cooperating with a hoisting drum around which a hoisting rope is wound. The dispensing winch is provided with a dispensing electric motor cooperating with a dispensing drum around which a dispensing rope is wound.

Hoists, platforms and davits are described as well as methods of securing same to telecommunication and other towers. The hoists, platforms and davits may be secured to the towers on a temporary basis using clamps. The clamps may include brackets and cables. The cables may be attached to the brackets, may wrap around the outer surface/perimeter of the tower pole/leg and may use tension to keep the bracket in place.

Hoists, platforms and davits are described as well as methods of securing same to telecommunication and other towers. The hoists, platforms and davits may be secured to the towers on a temporary basis using clamps. The clamps may include brackets and cables. The cables may be attached to the brackets, may wrap around the outer surface/perimeter of the tower pole/leg and may use tension to keep the bracket in place.

Tower crane (1) comprising a tower (2) on which a rotating portion (3) is pivotally mounted and configurable between a service configuration in which the rotating portion can be rotatably driven by means of a motorized orientation system (40), and an out of service configuration in which the rotating portion is rotatably released to be able to be oriented in the direction of the wind, where a control/command unit (5) activates a monitoring mode in the out of service configuration to detect, depending on variations in the angle of orientation or the angular speed of the rotating portion, if the rotating portion is in one of the following instability states: an autorotation state corresponding to a rotary movement of the rotating portion in a given direction over at least one complete turn; or an oscillation state corresponding to a back and forth movement of the rotating portion about the orientation axis.

The invention relates to an apparatus for compensating diagonal pull in cranes having at least one boom, having a boom drive for adjusting an angle and/or a length of the boom and/or for traveling a trolley, and having a control/regulation apparatus for controlling/regulating the boom drive. The invention is further directed to a crane having a corresponding apparatus.

A tower crane includes: a jib provided to extend or retract along the lengthwise direction; a cathead provided to extend or retract in the vertical direction; and a movable balance weight installed under a counter jib to be slidable in the horizontal direction, outwardly moved to be farther away from a mast when the jib is unfolded to have an increased length, and moved toward the mast when the jib retracts to have a decreased length, so that the center of gravity of the tower crane is adjusted according to the length of the jib and thus the balance is adjusted. Moreover, the tower crane comprises a movement guide part installed between the counter jib and the movable balance weight to guide the movement of the movable balance weight in the horizontal direction.

A tower crane includes: a jib provided to extend or retract along the lengthwise direction; a cathead provided to extend or retract in the vertical direction; and a movable balance weight installed under a counter jib to be slidable in the horizontal direction, outwardly moved to be farther away from a mast when the jib is unfolded to have an increased length, and moved toward the mast when the jib retracts to have a decreased length, so that the center of gravity of the tower crane is adjusted according to the length of the jib and thus the balance is adjusted. Moreover, the tower crane comprises a movement guide part installed between the counter jib and the movable balance weight to guide the movement of the movable balance weight in the horizontal direction.

When an engine is started in a state where a support member of a multi-coupler is attached to a mating support member, the pressure of hydraulic oil increases in a detection target pipeline part. A pressure detection unit detects the pressure of the hydraulic oil in the detection target pipeline part. A connection state determining unit determines whether a tank-side pipeline part and a motor-side pipeline part are connected to each other, based on the pressure. When the connection state determining unit determines that the tank-side pipeline part and the motor-side pipeline part are not connected to each other in a state where the engine is started, a pressure increase suppression unit carries out an operation for suppressing an increase in the pressure of a hydraulic motor.

A lattice structure is mounted on a work machine, and is detachably coupled to a counterpart lattice structure adjacent to the lattice structure. The lattice structure includes a connector to which an end portion of any main pipe among a plurality of main pipes is connected and to which an end portion of at least one inclined pipe among a plurality of inclined pipes is connected, the connector being detachably coupled to a counterpart connector included in a counterpart lattice structure.

A lattice structure is mounted on a work machine, and is detachably coupled to a counterpart lattice structure adjacent to the lattice structure. The lattice structure includes a connector to which an end portion of any main pipe among a plurality of main pipes is connected and to which an end portion of at least one inclined pipe among a plurality of inclined pipes is connected, the connector being detachably coupled to a counterpart connector included in a counterpart lattice structure.