Abstract: A combination including a crane and a load guiding arrangement arranged for mounting to the crane for controlling the orientation of a load suspended in a crane boom from a bearing wire about the bearing wire is provided. The load guiding arrangement includes: —two winches placed on the crane, —two taglines connected with the winches and two attachment brackets attached in a top zone of the crane boom and being connected to the load for applying a controlled torque to the load about the bearing wire. The load guiding arrangement furthermore includes: —for each winch a winch frame, which is arranged for mounting directly on the crane next to or on the crane counterweight in positions at each side of the crane and —two tagline redirection devices, for example snatch blocks which are connected with the load.

Abstract: 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.

Abstract: The disclosure relates to a mobile crane, such as a crawler crane, comprising an undercarriage having a traveling gear, a superstructure rotatably supported about a vertical axle on the undercarriage, a boom connected in an articulated manner to the superstructure pivotable about a horizontal axle, an A frame connected to the boom via a guying means, and a retraction mechanism by means of which the A frame is pivotable. In accordance with the disclosure, the A frame is separable and comprises a pole connected in an articulated manner to the superstructure and a folding pole releasably connected to the pole.

Abstract: A storage assembly, including a headache rack to removably connect to a vehicle, at least one storage container removably connected to at least a portion of the headache rack to store at least one first item therein, and a plurality of mounting assemblies, each of the plurality of mounting assemblies including a support beam removably connected to at least a portion of a rear portion of the headache rack, a mounting beam perpendicularly disposed away from the support beam with respect to a first direction to connect to the vehicle, and a stabilizing beam angularly disposed away from the mounting beam toward the support beam with respect to a second direction different from the first direction to prevent the support beam and the headache rack from moving.

Abstract: A bearing includes first and second rings and a plurality of rolling elements supporting the rings for relative rotation. At least the first ring is an axially split ring formed from a first part and a second part stacked against other in the axial direction. The first part includes first tapered through-holes and the second part includes second tapered through-holes axially aligned with the first tapered through-holes, and a plurality of taper pins extend in the aligned tapered through-holes of the first and second parts. Each of the taper pins has a threaded end portion, each of the taper pins contacts the first and second tapered through-holes, and a plurality of nuts are screwed onto the threaded end portions of the taper pins.

Abstract: The present inventions provides a lifting device 101 comprising a main body 105 being of a generally elongate form, said main body 105 having at one end thereof a transport means 102, 120 to allow said device to translate relative to the ground, a boom portion 103 cooperating with said main body 105 and adapted to support a load at its end, a motive power means 115 to lift or lower said load, said main body 105 being able to be pivoted by a user with respect to a fulcrum 102, 120 formed by either said transport means 102, 120 and a ground location or said transport means 102, 120, around an axis generally parallel to the ground, to transfer or arcuately move a load carried by said boom portion 103, thereby providing a functionally variable horizontal reach 1013 to said device 101.

Abstract: Provided is a swingable connection structure capable of detachably connecting a first member and a second member to each other easily. The swingable connection structure has a first member, a second member, and a swing holding member, and the second member is swingably connected to the first member. The first member has a swing shaft which defines a swing center axis of the second member, and the second member has a pivotally supported portion which receives the swing shaft. The swing holding member is mounted on a side surface of the second member in a rotatable manner, and the swing holding member is provided with a constraining hole which allows insertion of one end portion of the swing shaft received by the pivotally supported portion.

Abstract: Provided is a power transmission apparatus. The power transmission apparatus includes a rectilinear rack allowing a pinion to perform a rectilinear motion by interacting with the pinion, a curvilinear rack allowing the pinion to perform a curvilinear motion by interacting with the pinion, and a rectilinear-curvilinear conversion rack connected to the rectilinear rack and the curvilinear rack between the rectilinear rack and the curvilinear rack, and converting the rectilinear motion and the curvilinear motion of the pinion.

Abstract: The invention relates to a mobile crane having an undercarriage and a superstructure rotatable with respect to the undercarriage about an axis of rotation and having a ballast receiving apparatus arranged at the superstructure and having at least one ballasting cylinder for receiving ballast. In accordance with the invention, the position of the ballasting cylinders receiving the ballast is varied in the ballast receiving apparatus such that the ballast can be received in positions of different distances from the axis of rotation of the superstructure.

Abstract: The present disclosure relates to a support for a crane, in particular for a mobile crane, having at least two first support beams and two second support beams that are each arranged pairwise at mutually oppositely disposed sides of the support.

Abstract: A rope routing step and a raising step are executed. In the rope routing step, in a state where a raisable and lowerable member and a boom are laid down, a raising rope is coupled to the raisable and lowerable member and routed to extend rearward of the raisable and lowerable member. In the raising step, the raising rope is wound up rearward to raise the raisable and lowerable member. In the rope routing step, the raising rope is routed to pass between a lower restriction section and an upper restriction section of a rope support member, and in the raising step, the raising rope is wound up rearward with a vertical movement of the raising rope restricted by the upper restriction section and the lower restriction section.

Abstract: A boom attach/detach device includes a boom, an extensible cylinder, and a boom supporting device. At least a part of the boom supporting device is arranged more to a boom front end side than an upper slewing body. When the extensible cylinder conducts extension and contraction operation in a state where coupling between the upper slewing body and the boom by a boom foot pin is cut off, the boom supporting device supports the boom to enable a rear end portion of the boom to move in a boom axis direction. The boom can be attached or detached with ease without a need to use a separate power device from a crane to suppress increases in size, in mass, and in cost of an upper slewing body.

Abstract: A deck hoist tractor (DHT) for an unmanned platform (1) comprising an elongated base frame structure (12) carrying respective caterpillar drives (18) on each side enabling the tractor (2) to move forward and rearward, characterised in that the tractor (2) further comprising a tower frame structure (10) extending in substantially vertical direction from one end section of the base frame structure (12), which tower frame structure (10) is carrying a cantilevered top frame structure (11) carrying a lifting apparatus (22, 21), said caterpillar drives (18) are located at the same end section as said top frame structure (11), that said base frame structure (12) is extended by respective cantilevered beams (12a) space apart with an opening between them, each cantilevered beam (12) having an adjustable support structure (19) adjacent to their distal end (12b) from the caterpillar drive (18), said cantilevered top frame structure (11) is extended to vertically correspond with said respective cantilevered beams (12a),

Abstract: Crane of a wind turbine (200), comprising a fixed part (1), a pivoting part (2) which is attached with rotational freedom to the fixed part (1), a support (3) which is attached to the pivoting part (2), a winch (4), a wiring system between the winch (4) and the support (3), and a guide for guiding the wiring system along its path. The wiring system comprises a single wire (6), and the guide comprises a pulley (52) in the fixed part (1) for guiding it through said fixed part (1), and a pulley (53) in the pivoting part (2) for guiding it through said pivoting part (2). The wire (6) comprises a section (60) between the two pulleys (52, 53), which goes through the center of rotation of the pivoting part (2) with respect to the fixed part (1) connecting both parts (1, 2).

Abstract: A roller of a support arrangement for a rotary milking platform, where the support arrangement includes a first rail member fixedly connected to the rotary platform, a second rail member stationarily arranged in a position below the platform, and a plurality of rollers arranged in a vertical space between the first rail member and the second rail member. Each roller includes a peripheral surface comprising a contact surface to be in contact with a contact portion of the first rail member and a contact portion of the second rail member. The peripheral surface of the roller includes two beveled surfaces arranged at opposite sides of the contact surface which are located at a smaller distance from a rotary axis of the roller than the contact surface.

Abstract: In certain aspects, a roller assembly includes a base structure defining multiple recesses that extend inwardly from a top surface of the base structure, a first wheel, and a second wheel. The multiple recesses are configured such that at least one of the multiple recesses is engageable with an auxiliary component of the load, and the multiple recesses include a central recess positioned at a center of the top surface of the base structure. The first wheel is disposed along a first side of the base structure, and the second wheel is disposed along a second side of the base structure, the second side of the base structure being spaced apart from and parallel to the first side of the base structure.

Abstract: A lifting pole assembly configured for removable attachment to a tower comprising a lifting pole, a bottom bracket assembly, a top bracket assembly and vertical tilt means. The lifting pole has a lower end and an upper end. The bottom bracket assembly includes a first end attached to the tower and a second end attached to the lifting pole proximal to the lower end thereof. Similarly, the top bracket assembly includes a first end attached to the tower at a position above the point where the bottom bracket is attached to the tower and a second end attached to the lifting pole at a position above the point where the bottom bracket is attached to the lifting pole. The vertical tilt means enables the lifting pole to pivot in the vertical plane about a point proximal to the connection between the bottom bracket and the lower end of the lifting pole. Horizontal pivot means for enabling the lifting pole to pivot in the horizontal plane relative to the tower may also be provided.

Abstract: The invention relates to a wind turbine rotor comprising a hub, a plurality of blades, and at least one pitch mechanism for rotating at least one of the blades, each pitch mechanism comprising a partial ring gear, a pitch bearing, a pinion that is arranged to mesh with the partial or complete ring gear and a pitch motor arranged for driving said pinion, wherein the pitch bearing is mounted between the hub and a blade, and the ring gear is mounted on the hub or on the blade. The invention further relates to a method of repairing a partial or complete ring gear in a wind turbine rotor, the ring gear comprising a plurality of segments, the method comprising detaching at least a segment of the ring gear and attaching the ring gear in a modified configuration.

Abstract: Provided is a working machine including a device to be maintained and a winch disposed thereover and enabling a maintenance operation. The working machine includes a base machine, at least one device to be maintained installed at the base machine, and a winch which is driven to wind an operation rope. The winch is attached to the base machine to be pivotable, about a winch support shaft, between a use position at which the winch is used while closing at least a part of a maintenance space over the device to be maintained and a maintenance position at which the winch opens the maintenance space upward to enable the maintenance operation to be performed.

Abstract: Rolling bearing (1) comprising an inner ring (3), an outer ring (2), at least one row of rolling elements which are arranged between raceways made on the rings (2, 3) and an ring gear (6) fixed to one of the rings (2). The ring gear (6) is formed of at least two independent gear segments (7, 8, 9, 10, 11, 12) which are each provided on their inner or outer peripheral surface with a plurality of meshing means (7b, 8b, 9b, 10b, 11b, 12b) and fixed only to one of either the inner or outer rings (3) of the rolling bearing (1), the circumference of the ring gear (6, 20) being substantially equal to the circumference of the combination of the independent gear segments.

Abstract: Provided are a raisable-lowerable member capable of shortening a time required for assembling and disassembling of a crane, and a crane comprising the raisable-lowerable member. The raisable-lowerable member comprises: a boom attachable to an upper slewing body of the crane turnably about a boom-pivot-turn-axis in a raising-lowering direction; and a mast to be driven so as to be turned about a mast pivot-turn-axis parallel to the boom-pivot-turn-axis. The boom includes a boom body, a boom foot joined to a basal end of the boom body and adapted to be attached to the upper slewing body turnably about the boom-pivot-turn-axis, and a mast mounting portion joined to the basal end of the boom body. The mast has a basal end which includes a mast foot to be attached to the mast mounting portion turnably about the mast pivot-turn-axis.

Abstract: The present invention relates to a telescopable sliding beam device with a sliding beam box and at least one first sliding beam and at least one second sliding beam, which are telescopable into each other, wherein the second sliding beam is mounted in the sliding beam box so as to be steplessly telescopable, and wherein in a first supporting region the first sliding beam is retracted and a stepless adjustment of the sliding beam device can be carried out by shifting the second sliding beam. According to the invention, the first sliding beam furthermore is extended in a second supporting region and a stepless adjustment of the sliding beam device can be carried out by shifting the second sliding beam.

Abstract: A stability device for a payload suspended from a payload sling includes a first wind deflecting member having a leading edge portion and a trailing edge portion; a second wind deflecting member having a leading edge portion and a trailing edge portion; the first wind deflecting member and the second wind deflecting member forming a substantially V-shaped structure; a tip portion of the V-shaped structure comprising the leading edge portion of the first wind deflecting member and the leading edge portion of the second wind deflecting member; an open portion of the V-shaped structured comprising the trailing edge of the first wind deflecting member and the trailing edge of the second wind deflecting member; and a securing mechanism removably coupling the payload stability device to the payload.

Abstract: A mobile lift crane includes a carbody having movable ground engaging members; a rotating bed rotatably connected to the carbody; a boom pivotally mounted on the rotating bed; a first hoist drum mounted in a first frame connected to the rotating bed; a second hoist drum mounted in a second frame connected to the rotating bed. Connectors used to connect the load hoist drum frames to the rotating bed include engagement members and alignment surfaces such that as the two crane components are brought close to their operational position during an assembly operation, the engagement member and the alignment surface of the connectors come into contact with one another to guide the crane components into their operational orientation so that a main pin can be placed through the through-holes of the extensions of the connectors.

Abstract: A lattice mast crane having a lattice mast boom which can be luffed up in a vertical luffing plane and which comprises a pivotal connection piece, a plurality of lattice pieces releasably connectable to one another, and a head piece, with the lattice mast boom having a two-strand or multi-strand region, wherein at least one side part is releasably arranged at the pivotal connection piece and the two-strand or multi-strand region is arranged directly or indirectly at the pivotal connection piece and/or directly or indirectly at least one side part.

Abstract: A set-up winch for a crane, in particular for a mobile crane is designed as a transportable, modular unit. Characteristically, the winch's mounting element for mounting the winch to the crane comprises a securable quick-acting mounting system. Embodiments have a hang-in mounting system with a hang-in bolt and a safety bolt.

Abstract: A method of assembling a mobile lift crane that includes, during operation, i) a rotating bed having attached thereto a luffing jib hoist drum and line, and a rigging winch drum and line, ii) a boom pivotally mounted on the rotating bed, iii) a luffing jib pivotally mounted to the end of the boom, iv) a first strut also pivotally connected to the end of the boom, and v) a second strut connected to the boom below the connection point of the first strut, the method including: a) pivotally connecting the first strut to the end of the boom; b) pivotally connecting a first section of the second strut near the top of the boom; c) connecting the rigging winch line to the top of the first section; d) pivotally attaching a second section of the second strut to the first section such that the second section lies folded onto the first section, forming a folded second strut; and e) lifting the second section while retracting the rigging winch line to thereby bring the first and second sections into alignment with each ot

Abstract: A crane includes first and second column segments. At least a first, third and fifth connector are located on the first segment, respectively mating with at least a second, fourth and sixth connector on the second segment. Each of the connectors includes at least a first extension having a through-hole positioned in the extension such that the through-holes of mating connectors are aligned when the column segments are aligned. A first pin fits tightly through the through-hole of the first extension on the first connector and the through-hole of the first extension on the second connector to hold the first and second connectors together. A second pin fits loosely through the through-hole of the first extension on the third connector and the through-hole of the first extension on the fourth connector to hold the second and fourth connectors together. The connectors also include a compressive load bearing surface.

Abstract: The object of the invention is to reduce the amount of investment required for the usage-optimized configuration and installation of large cranes. This object is achieved by a large mobile crane having an undercarriage, a drive unit (16), a revolving superstructure (18), one or more control stations (17), at least two jibs (3), at least one counter-jib (4), at least two lifting arrangements (22) and counterweights arranged separately or on the basic structure, characterized in that the load-bearing parts of the crane (3, 4, 20) and the mobility-specific parts (5, 6, 7) are of modular design and can be supplemented by exchangeable and/or supplementary parts, wherein the structural units (modules) used essentially correspond, or are similar, to existing standard-crane components, and an increase in load-bearing capacity can be achieved by arranging a number of these in the large crane.

Abstract: A crane vessel including a revolving hoist crane and a method of using such a vessel are provided. The hoist crane includes a jib, main hoisting means and auxiliary hoisting means for raising and lowering a load. The main hoisting means include a main hoisting tackle with a main hoist upper block connected to the jib and a main hoist lower block. The main hoist lower block is assembled from a sheave block including the sheaves of the main hoist lower block and a load attachment assembly having the lowering weight and the main load attachment device. The crane vessel is provided with a load attachment assembly storage device for storage of the disassembled load attachment assembly and displacement means capable of engaging with and displacing the load attachment assembly while it is assembled to the sheave block and when the jib is supported by a jib rest.

Abstract: Embodiments of the disclosure provide a fall arrest system. The fall arrest system may include a post disposed on a clamp. The clamp may be configured to secure to a base structure. The fall arrest system may also include a davit arm disposed on the post via one or more hinges. The post may be configured to support a winch and the davit arm may be configured to support a cable therefrom.

Abstract: A portable derrick system for use in hoisting and lowering loads at a plurality of job sites, comprising, in combination: a boom subassembly, a boom head subassembly, a mast support subassembly, a mast head subassembly, a load-carrying line, a winch capable of cooperating with said line, power means for driving the winch, means for pivoting the boom assembly, means for controlling said pivoting means, the foregoing elements of the invention capable of being transported by humans to elevated positions such as, without limitation, rooftops and terraces, and wherein the aforementioned are capable of repeated assembly and disassembly at a plurality of job sites and serving to facilitate the elimination of the need for a street-level crane.

Abstract: An assembly method is capable of assembling a transfer mechanism which transfers a target and includes a pick unit for holding the target, a slide unit for sliding the pick unit and a drive unit for driving the slide unit. The assembly method includes installing a lifting mechanism for lifting the units at a ceiling portion of a transfer chamber where the transfer mechanism is accommodated; and assembling the units loaded into the transfer chamber inside the transfer chamber by using the lifting mechanism.

Abstract: A pin removal assembly for use with an upper block of a crane includes a sheave support and a pin support. The upper block includes a frame, a plurality of sheaves, and a removable sheave pin that defines and axis of rotation for the sheaves and supports the sheaves within the frame. The pin removal assembly includes a sheave support mountable to the frame of the upper block and a pin support mountable to the frame of the upper block. The pin support is configured to support the sheave pin when the sheave pin is removed from the upper block.

Abstract: A mobile lift crane includes a carbody having moveable ground engaging members; a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the ground engaging members; a boom pivotally mounted on the rotating bed; a first hoist drum mounted in a first frame connected to the rotating bed; a second hoist drum mounted in a second frame connected to the rotating bed; and a third hoist drum mounted in a third frame indirectly connected to the rotating bed by being connected to at least one of the first and second hoist drum frames. Preferably load hoist drum frames are connected to the rotating bed by removable pins, the hoist drum and frame thus being detachable from the rotating bed as a combined unit.

Abstract: A maintenance method is provided for a wind turbine generator including a tower and a nacelle. The maintenance method includes: attaching a pedestal to the tower; attaching a jack to the pedestal; and lifting the nacelle by using the jack to detach the nacelle from the tower, from a state where the nacelle is rotatably connected to the tower.

Abstract: A fully collapsible lightweight mount to support a cargo loading apparatus. The mount has releasably attached horizontal and vertical arms, with a bracket to adjustably attach a cargo loading device on the vertical arm. In one embodiment, the horizontal arms have brackets configured to attach to “stake holes” in the standard side walls of a pickup truck cargo bed. The vertical arm of the device may be further supported against for example, a cargo bed forward wall or floor by a floor brace. Alternatively horizontal arm may attach to a pickup truck trailer hitch by additional mounts and connecting arm components suitable for attachment to a class 3 trailer hitch. The component parts can be readily assembled and disassembled, are lightweight, and occupy little space. The disassembled device can be stored in a carrying bag in the cab or other compartment of a vehicle.

Abstract: A mobile lift crane includes a carbody made from two side members and two end cross members connected to each other with a carbody connection that can be disconnected such that the side members and end cross members can be individually transported between job sites and reassembled at a new job site. Preferably the two side members are interchangeable with each other when making the carbody, and the two end cross members are also interchangeable with each other. Further, each of the side members and end cross members preferably has a section of a roller path and section of a ring gear attached to them while being transported and assembled.

Abstract: A rotating superstructure includes: a front block on which a power unit that includes a prime mover; and a rear block on which a unit for raising and lowering a boom that includes a winch, a, and an arm. And the rotating superstructure is configured to be split into the front block and the rear block.

Abstract: A modular structural load bearing device including light-weight composite structural members each including an elongated body having at least one internal recess for a cable in the recess or series of recesses. Preassembled and presized composite support members and connectors can form a modular structure, such as a crane. When used, end pieces or other components on an end of the elongated body can secure a cable. For assembly of the structural load bearing apparatus, connectors can be used with composite structural members that are light-weight with relatively thin walls while providing enhanced benefits for resisting the combination of tension, compression and buckling forces.

Abstract: A pin removal assembly for use with an upper block of a crane includes a sheave support and a pin support. The upper block includes a frame, a plurality of sheaves, and a removable sheave pin that defines and axis of rotation for the sheaves and supports the sheaves within the frame. The pin removal assembly includes a sheave support mountable to the frame of the upper block and a pin support mountable to the frame of the upper block. The pin support is configured to support the sheave pin when the sheave pin is removed from the upper block.

Abstract: A jib crane which can prevent an unexpected movement of a burden and can sufficiently ensure the safety of a burden handling work is disclosed. The jib crane has hoisting wire ropes for lifting and landing a hook, derricking wire ropes for derricking operation of a jib, and a conversion device for fixing tips of the wire ropes to a revolving frame of a revolving table. The conversion device has a V-shaped link pivotally supported on a bearing bracket via a pivot pin. The tips of the wire ropes are connected to paired link arms of the V-shaped link.

Abstract: The present invention concerns a lifting device for replacing dynamic or static components of helicopter-type rotary wing aircraft. The device in one embodiment comprises a lifting means to move components between an installation/removal position and a loading/unloading position located near the aircraft, a supporting structure on which the lifting means is mounted, and support means rigidly attached to the supporting structure. The support means can rest on and be directly secured to the airframe of the aircraft.

Abstract: A counterweight block apparatus includes a pair of interconnecting counterweight blocks having top and bottom surfaces, the counterweight blocks forming a plane of interconnection along adjacent sides thereof; and a shear bar releasably secured between the adjacent sides of the interconnecting counterweight blocks, generally perpendicular to the plane of interconnection, to provide resistance to relative vertical movement of the interconnecting counterweight blocks along the plane of interconnection. In another aspect, each counterweight block includes in at least one side thereof an indentation from a top of the counterweight block to a depth more shallow than the thickness of the counterweight block, the indentation defining a lip for hand grabbing. An aperture may be formed through the rest of the thickness of the counterweigh block at each indentation, wherein a securing strap can be run through each aperture of a stacked plurality of counterweight blocks to secure them to each other.

Abstract: Structural members widely adaptable for use to build various composite structures and assemblies having horizontal and vertical supports, such as columns, beams and rails, are shown and described. The composite structural members include a longitudinal channel having a web and first and second legs. Each leg includes a plane that extends from a side of the web and is inclined relative to the web, and a cylinder is located at an edge of the leg that is spaced from the web. Various fittings can be used to engage at least one of the cylinders of the channel to fix the channel in position relative to a second, third and/or fourth channel to form the column, beam or rail. Further, select brackets can be used to attach together columns, beams and rails of the assembly.

Abstract: A movable independent crane system for moving or replacing components during maintenance operations and for mounting wind generators, including an auxiliary portal crane providing a portal structure designed to be movable around a pod about a rotation shaft. The mobile independent crane system includes raising devices being part of the crane system and designed to allow self-raising of the crane system because the mobile independent crane system is anchored to the pod through an anchoring unit and because the mobile independent crane system is designed to operate over the pod and outside the pod sides.

Abstract: This invention relates to a lattice piece for a large mobile crane, comprising four corner posts and null bars and diagonal bars connecting the same. In accordance with the invention, the lattice piece each is divided in two such that one part of the null and diagonal bars each is foldably hinged at two corner posts connected with each other. Furthermore, the invention relates to a method for erecting such lattice piece.

Abstract: A mobile lift crane includes a carbody made from two side members and two end cross members connected to each other with a carbody connection that can be disconnected such that the side members and end cross members can be individually transported between job sites and reassembled at a new job site. Preferably the two side members are interchangeable with each other when making the carbody, and the two end cross members are also interchangeable with each other. Further, each of the side members and end cross members preferably has a section of a roller path and section of a ring gear attached to them while being transported and assembled.

Abstract: A wind tower erection device and method for erecting wind turbine towers which avoid the need for using expensive cranes. The device and method employs a stacker unit for anchoring to the wind turbine foundation, a plurality of intermediate modules, and a mechanical actuator for raising the intermediate modules vertically. The stacker unit has a receptacle allowing for lateral sliding of intermediate modules inside of the stacker unit. In one embodiment, the stacker unit has a receptacle for lateral sliding of intermediate modules inside of the stacker unit. The stacker unit and the intermediate modules each have at least one open side to for positioning of tower sections within the stacker unit and stacked intermediate modules. A bridge crane section is initially placed on top of the stacked intermediate modules.

Abstract: The invention relates to a tie-back system for a crane comprising a rotatable base with a generally vertical support frame and a lifting arm which is with a lower end hingedly connected to the base in a hinge point, an upper part of the frame carrying a displacement member movable relative to the frame, the displacement member carrying a first cable guide means, a first cable extending from a first connection point on the arm along the first cable guide means to a first pulling device. The displacement member comprising a tie connection point for connection to a tie member, a second cable guide means attached to an upper part of the frame and a second cable extending from a second connection point on the arm along the second cable guide means to a second pulling device.