Mobile heavy lift crane system

Abstract

A mobile heavy crane system comprises a crane (1) and a rail arrangement configured to be installed on the ground and comprising: - a circular slewing rail assembly (100) extending around a slewing center for at least a slewing arc and comprising at least a pair of concentric first and second slewing rails, - a linear crane rail assembly (120).

Description

Technical Field

[0001] This invention relates to the field of mobile heavy-duty crane systems. Background Technology

[0002] In the field of mobile heavy-duty crane systems, systems are known, for example, as disclosed in WO2010 / 121134 and WO2019 / 050405. One example of a mobile heavy-duty crane system is the SK10,000 crane system developed by ALE Corporation.

[0003] Typically, a mobile heavy-duty crane system consists of a crane, which includes:

[0004] - A crane bracket comprising a base and a rail engagement member configured to engage with a corresponding rail of a crane rail assembly.

[0005] - The main hanger, which pivots about its pivot axis relative to the base of the crane bracket, and has a main hanger tip.

[0006] - The rear tower, which pivots about the rear tower pivot axis relative to the base of the crane bracket, and has a rear tower tip.

[0007] - An adjustable length device located between the rear tower and the main gantry.

[0008] - Counterweight, which is suspended on the rear tower.

[0009] - A track device configured to be mounted on the ground and comprising a circular rotary track assembly extending around a center of rotation in at least a section of a rotary arc, the track device comprising at least a pair of concentric first rotary tracks and second rotary tracks.

[0010] Cranes are very large and are typically assembled at locations where lifting operations are performed, such as refineries and power plants. Typically, the main frame and rear tower are assembled as separate modules. The track assembly usually includes a load distribution plate, on which the rails are mounted to distribute the load according to the tolerable ground pressure. Summary of the Invention

[0011] The present invention aims to provide a mobile heavy-duty crane system with enhanced versatility and / or enhanced operational efficiency.

[0012] This invention provides a mobile heavy-duty crane system according to claim 1. In this document, the design of the crane bracket is combined with the design of the track assembly to allow the crane to move to a transfer position on a straight track assembly, in which track engagement members of the first and second rotating base frames are each arranged at the joint of the track assembly, wherein the track engagement members are aligned with the corresponding circular rotary tracks, thereby enabling the crane to perform rotary motion about a rotation center when supported on the rotary track assembly.

[0013] In practice, this allows the slewing track assembly to be positioned at the location where actual lifting operations, such as those involving refinery towers, will take place. Typically, at such locations, space available for crane assembly is limited or insufficient, necessitating the horizontal assembly of the main crane (and any existing cantilever) on the ground before bringing it into the raised position. In practice, the main crane (possibly with cantilever) can exceed 100 meters in length. The system of the present invention enables the extension of a straight crane track from the slewing track assembly to a distal location where there is sufficiently clear ground space for crane assembly, such as horizontal assembly including the main crane (possibly with cantilever). After assembly, the crane can then be moved onto the slewing track on the straight crane track with the main crane raised.

[0014] Due to the arrangement of the joints and the pivoting function of multiple groups of one or more track engagement members (e.g., one or more sliding members), these track engagement members can be aligned with a corresponding circular slewing track, thereby enabling the crane to perform slewing motion about a center of rotation while supported on the slewing track assembly. Pivoting can be performed by an actuator, such as a hydraulic actuator, which can be integrated with the bracket but can also be implemented as a separate tool for this purpose.

[0015] The slewing capability of the bracket's base allows for width differences between the linear crane rails and the rotary rails. As disclosed herein, the slewing capability can also allow for other configurations of the mobile heavy-duty crane system.

[0016] In the implementation, the track assembly further includes a linear counterweight track assembly configured parallel to the linear crane track assembly, preferably extending to the center of rotation. The counterweight is configured to move on the linear counterweight track assembly, for example, moving together with the crane carriage of a crane moving to a transfer position on the linear track assembly. Therefore, the counterweight can help maintain the main frame and, possibly, the jib, in an elevated position while traveling on the linear crane track to the transfer position. For example, during lifting operations using the crane, the counterweight is located at or near the center of rotation. The arrangement of the linear counterweight track assembly allows the counterweight to be assembled at a location away from the rotary track, thus also avoiding limitations associated with the location where the actual lifting operation is to be performed. In the implementation, the linear counterweight track assembly intersects with a circular rotary track assembly, for example, with the end of the semi-circular rotary track assembly.

[0017] In the implementation plan, the counterweight is configured to be positioned at the center of rotation during lifting operations, wherein a swivel is provided between the counterweight and the rear tower.

[0018] In one embodiment, the crane has a main lifting assembly, which includes at least one main lifting load connector (e.g., a crane hook), a main lifting cable, and a main lifting winch, wherein the main lifting winch is mounted on the crane base.

[0019] In the implementation scheme, the slewing track device has a first slewing track and a second slewing track, wherein the first straight crane track and the second straight crane track intersect the first slewing track and the second slewing track at two joints, respectively.

[0020] In the implementation scheme, the circular rotary track includes a concentric first rotary track, a second rotary track, and a third rotary track, wherein the crane track has a parallel first straight crane track and a second straight crane track, wherein the first crane track intersects the first and second rotary tracks at at least one joint, and wherein the second straight crane track intersects the second and third rotary tracks at at least one joint, so that in operation, the crane can move on the straight track assembly to a transfer position, in which the track engagement members of the first and second rotating frames are respectively arranged at the joint of the track assembly, wherein the track engagement members are aligned with the corresponding circular rotary tracks, such that one set of track engagement members of the first rotating frame engages on the first rotary track, another set of engagement members of the first rotating frame engages on the second rotary track, and one set of track engagement members of the second rotating frame engages on the second rotary track, and another set of engagement members of the second rotating frame engages on the third rotary track, thereby enabling the crane to perform a rotary motion about a rotation center when supported on the rotary track assembly.

[0021] In the implementation, the counterweight bracket includes multiple groups of one or more track engagement members, such as one or more sliding members, each group of track engagement members being configured to engage with a corresponding track of the counterweight track assembly, wherein each track engagement member pivots about a corresponding vertical pivot axis, and the linear counterweight track assembly intersects with the circular rotary track assembly at the engagement point so that, in operation, the counterweight can be moved to a transfer position where the track engagement members of the counterweight bracket are respectively arranged at the engagement point, wherein the track engagement member is aligned with the corresponding circular counterweight track.

[0022] The present invention also provides a dual-mobile heavy-duty crane system comprising two cranes and a rail assembly configured to be mounted on the ground to support the two cranes. In this document, each of the two cranes comprises:

[0023] - A crane bracket, comprising a base, a first rotating base frame, and a second rotating base frame, the first and second rotating base frames being adapted to support the base, each base frame rotating relative to the base about a corresponding first vertical base frame rotation axis and a corresponding second vertical base frame rotation axis.

[0024] Each base frame has one or more track engagement members, such as sliding members, on opposite sides of a corresponding axis of rotation. Each group of track engagement members is configured to engage with a corresponding track of the crane track assembly, wherein each track engagement member pivots relative to the corresponding base frame about a corresponding vertical pivot axis.

[0025] The track assembly includes a circular rotary track assembly extending around a center of rotation by at least one segment of a rotary arc, wherein the circular rotary track includes at least a first rotary track, a second rotary track, and a third rotary track, wherein the second track is located between the first track and the third track, and wherein the crane base is configured such that a set of track engagement members of the first rotating frame engages on the first rotary track and another set of engagement members of the first rotating frame engages on the second rotary track, and wherein the crane base is configured such that a set of track engagement members of the second rotating frame engages on the second rotary track and another set of engagement members of the second rotating frame engages on the third rotary track.

[0026] This dual-crane arrangement allows for lifting operations where two cranes are used to handle the load. Because the two cranes are located on at least concentric first, second, and third slewing tracks, ground pressure is relatively limited.

[0027] In a practical, advantageous embodiment, the pivot axes of the main cranes of the two cranes are aligned with each other in at least one relative position on a circular slewing track. This, for example, enables the main cranes of the two cranes to perform identical and synchronized lifting movements.

[0028] In the implementation scheme, the track device further includes a circular counterweight track assembly configured to be arranged concentrically with the crane track assembly and extend about a rotation center, wherein each counterweight is configured to move on a circular linear counterweight track assembly, for example, together with the crane base of the crane that moves on the slewing track assembly during crane rotation.

[0029] In the implementation scheme, the circular rotary track includes a concentric first rotary track, a second rotary track, and a third rotary track, wherein the crane track has a parallel first straight crane track and a second straight crane track, wherein the first crane track intersects the first and second rotary tracks at at least one joint, and wherein the second straight crane track intersects the second and third rotary tracks at at least one joint, so that in operation, the crane can move on the straight track assembly to a transfer position, in which the track engagement members of the first and second rotating frames are respectively arranged at the joint of the track assembly, wherein the track engagement members are aligned with the corresponding circular rotary tracks, such that one set of track engagement members of the first rotating frame engages on the first rotary track, another set of engagement members of the first rotating frame engages on the second rotary track, and one set of track engagement members of the second rotating frame engages on the second rotary track, and another set of engagement members of the second rotating frame engages on the third rotary track, thereby enabling the crane to perform a rotary motion about a rotation center when supported on the rotary track assembly.

[0030] In one embodiment, the counterweight bracket includes multiple groups of one or more track engagement members, such as one or more sliding members, each group of track engagement members being configured to engage with a corresponding track of the counterweight track assembly, wherein each track engagement member pivots about a corresponding vertical pivot axis.

[0031] The linear counterweight track assembly intersects with the circular rotary track assembly at the joint so that, during operation, the counterweight can be moved to a transfer position in which the track connecting members of the counterweight bracket are each arranged at the joint, wherein the track connecting members are aligned with the corresponding circular counterweight track.

[0032] It should be understood that the crane and / or counterweight designs described in relation to the dual crane system can also be used with the linear crane rails discussed above, and vice versa.

[0033] The present invention also relates to a dual mobile heavy-duty crane system comprising two cranes and two rail assemblies, each rail assembly being configured to be mounted on the ground to support one of the two cranes, wherein each of the two cranes comprises:

[0034] - A crane bracket, comprising a base, a first rotating base frame, and a second rotating base frame, the first and second rotating base frames being adapted to support the base, each base frame rotating relative to the base about a corresponding first vertical base frame rotation axis and a corresponding second vertical base frame rotation axis.

[0035] Each base frame has one or more track engagement members, such as sliding members, on opposite sides of a corresponding axis of rotation. Each group of track engagement members is configured to engage with a corresponding track of the crane track assembly, wherein each track engagement member pivots relative to the corresponding base frame about a corresponding vertical pivot axis.

[0036] - The main hanger, which is pivotable relative to the base of the crane bracket about a main hanger pivot axis, and has a main hanger tip.

[0037] - Rear tower, which is pivotable relative to the base of the crane bracket about a rear tower pivot axis, and has a rear tower tip.

[0038] - An adjustable length device located between the rear tower and the main gantry.

[0039] - Counterweight, which is suspended on the rear tower.

[0040] Each track device is configured to be installed on the ground and includes:

[0041] - Circular rotary track assemblies extending around the center of rotation in at least one arc, wherein the circular rotary track assemblies are spaced apart.

[0042] The present invention also relates to a mobile heavy-duty crane system, comprising:

[0043] - Cranes, which include:

[0044] - A crane bracket, comprising a base, a first rotating base frame, and a second rotating base frame, the first and second rotating base frames being adapted to support the base, each base frame rotating relative to the base about a corresponding first vertical base frame rotation axis and a corresponding second vertical base frame rotation axis.

[0045] Each base frame has one or more track engagement members, such as sliding members, on opposite sides of a corresponding axis of rotation. Each group of track engagement members is configured to engage with a corresponding track of the crane track assembly, wherein each track engagement member pivots relative to the corresponding base frame about a corresponding vertical pivot axis.

[0046] - The main hanger, which is pivotable relative to the base of the crane bracket about a main hanger pivot axis, and has a main hanger tip.

[0047] - Rear tower, which is pivotable relative to the base of the crane bracket about a rear tower pivot axis, and has a rear tower tip.

[0048] - An adjustable length device located between the rear tower and the main gantry.

[0049] - Counterweight, which is suspended on the rear tower.

[0050] - A track device configured to be mounted on the ground and comprising:

[0051] - A circular rotary track assembly that extends around the center of rotation in at least one rotary arc.

[0052] It includes at least a pair of concentric first and second rotary tracks.

[0053] The present invention also relates to a method for lifting and lowering a load, wherein a crane system as described herein is used.

[0054] The present invention also relates to a method for installing a crane system as described herein in a lifting location to lift a load, wherein the method includes:

[0055] - Install a circular rotary track assembly in the lifting area.

[0056] - Install a linear crane rail assembly that extends from the lifting location to the crane assembly location.

[0057] - Assemble the crane at the assembly site, including, for example, assembling the main crane horizontally and raising the assembled main crane to the raised position.

[0058] - The assembled crane is moved to a transfer position on a straight crane track assembly, in which the track engagement members of the first and second rotating base frames are respectively arranged at the joint of the track assembly, aligning the track engagement members with the corresponding circular slewing track, thereby enabling the crane to perform slewing motion around the center of rotation while supported on the slewing track assembly.

[0059] The present invention also relates to a mobile heavy-duty crane, comprising:

[0060] - A crane bracket, comprising a base, a first rotating base frame, and a second rotating base frame, the first and second rotating base frames being arranged and configured to support the base thereon, each base frame rotating relative to the base about a respective first vertical base frame rotation axis and second vertical base frame rotation axis.

[0061] Each base frame has a group of one or more track engagement members, such as one or more sliding members, on opposite sides of a corresponding axis of rotation. Each group of track engagement members is configured to engage with a corresponding track of the crane track assembly, wherein each track engagement member pivots relative to the corresponding base frame about a corresponding vertical pivot axis.

[0062] - The main hanger, which is pivotable relative to the base of the crane bracket about a main hanger pivot axis, and has a main hanger tip.

[0063] - Rear tower, which is pivotable relative to the base of the crane bracket about a rear tower pivot axis, and has a rear tower tip.

[0064] - An adjustable length device located between the rear tower and the main gantry.

[0065] - Counterweight, which is suspended on the rear tower.

[0066] A second aspect of the invention also relates to a mobile heavy-duty crane system comprising:

[0067] - Cranes, which include:

[0068] - A crane bracket, comprising a base, a first base frame, and a second base frame, the first and second base frames being arranged and configured to support the base thereon, for example, each base frame rotating relative to the base about a respective first vertical base frame rotation axis and second vertical base frame rotation axis.

[0069] Each base frame has a group of one or more track engagement members, such as one or more sliding members, on opposite sides of a corresponding axis of rotation. Each group of track engagement members is configured to engage with a corresponding track of the crane track assembly, wherein each track engagement member pivots relative to the corresponding base frame about a corresponding vertical pivot axis.

[0070] - The main hanger, which is pivotable relative to the base of the crane bracket about a main hanger pivot axis, and has a main hanger tip.

[0071] - Rear tower, which is pivotable relative to the base of the crane bracket about a rear tower pivot axis, and has a rear tower tip.

[0072] - An adjustable length device located between the rear tower and the main gantry.

[0073] - Counterweight, which is suspended on the rear tower.

[0074] - A track device configured to be mounted on the ground and comprising:

[0075] - A circular rotary track assembly extending around a center of rotation in at least a rotary arc, and comprising at least a pair of concentric first and second rotary tracks.

[0076] - A straight crane track assembly comprising at least a pair of parallel first and second straight crane tracks.

[0077] The track assembly is configured such that a straight track assembly intersects with a circular rotary track assembly, each straight crane track intersecting with at least one circular rotary track at a joint of the track assembly, so that during operation, the crane can move on the straight track assembly to a transfer position, in which track engagement members of the first and second rotating base frames are respectively arranged at the joint of the track assembly, wherein the track engagement members are aligned with the corresponding circular rotary tracks, thereby enabling the crane to perform a rotary motion about a rotation center when supported on the rotary track assembly.

[0078] Preferably, each base frame is configured to rotate relative to the base about a respective first vertical base frame rotation axis and a second vertical base frame rotation axis. However, in one embodiment, the first and second base frames cannot rotate relative to the base of the bracket. It should be understood that this limits the versatility of the crane system, but this embodiment is still more versatile than existing heavy-duty crane systems.

[0079] It should be understood that the crane system of the second aspect may include one or more features discussed herein, such as one or more features as described in the appended claims. Attached Figure Description

[0080] The invention will now be discussed with reference to the accompanying drawings. In the drawings:

[0081] - Figure 1 An example of a mobile heavy-duty crane system according to the invention is shown, wherein the crane is arranged on a circular slewing track assembly.

[0082] - Figure 2 Showing from different perspectives Figure 1 crane,

[0083] - Figure 3a Show Figure 1 A plan view of the crane system, showing the crane's position on the straight crane rails and its transfer position.

[0084] - Figure 3b This illustrates the alignment of multiple groups of track engagement components with the rotary track.

[0085] - Figure 3c An embodiment of an actuator for aligning a plurality of grouped track engagement components with a rotary track is shown.

[0086] - Figure 4 A plan view showing the situation on a straight crane track. Figure 1 The bracket of the medium-sized crane,

[0087] - Figure 5A plan view showing the situation on a circular rotating track. Figure 1 The bracket of the medium-sized crane,

[0088] - Figure 6 Previous view shown Figure 1 Part of the crane,

[0089] - Figure 7 Showing the use Figure 1 The crane system lifts and lowers the load.

[0090] - Figure 8 Showing from different perspectives Figure 7 In this situation,

[0091] - Figure 9 Shown schematically in a side view Figure 7 The lifting and lowering, with enlarged details showing possible implementations of the main hanger module,

[0092] - Figure 10 Shown in plan view Figure 1 Variations of crane systems,

[0093] - Figure 11a This illustration shows a possible implementation of a module for the main hanger assembly, the module being used to form sections of the legs of the main hanger.

[0094] - Figure 11b Show Figure 11a The module of the implementation plan,

[0095] - Figure 12 Showing truck transport Figure 11b The module,

[0096] - Figure 13 Show Figure 1 The counterweight of the crane system,

[0097] - Figure 14 Show Figure 1 Part of the crane system,

[0098] - Figures 15a to 15i Step by step Figure 1 Assembly of the main lifting frame of the medium-sized crane.

[0099] - Figure 16 An example of a dual-mobile heavy-duty crane system according to the present invention is shown, wherein two cranes are arranged on a three-track circular rotary track assembly.

[0100] - Figure 17 Shown in plan view Figure 16 crane system,

[0101] - Figure 18Showing from different perspectives Figure 16 crane system,

[0102] - Figure 19 The view is roughly as shown in the previous view. Figure 16 Part of the crane system,

[0103] - Figure 20 The general rear view is shown Figure 16 Part of the crane system,

[0104] - Figure 21 Shown in plan view Figure 16 The crane system, which is in relation to Figure 17 Different turning positions,

[0105] - Figure 22 An example of a dual-moving heavy-duty crane system according to the invention is shown schematically in a plan view, having a three-track circular rotary track assembly and a straight crane track assembly, wherein two cranes are shown positioned on the crane track assembly.

[0106] - Figure 23 Show Figure 22 The crane system, in which the crane has been moved to the transfer location.

[0107] - Figure 24 , Figure 25 Showing Figure 22 , Figure 23 The crane's multiple groups of rail-connecting components are aligned with corresponding circular rotary rails.

[0108] - Figure 26 A plan view showing the lifting operation Figure 22 crane system,

[0109] - Figure 27 Another example of a crane system according to the invention during load lifting is shown, and

[0110] - Figure 28 Showing from different perspectives Figure 27 The crane system. Detailed Implementation

[0111] Figures 1 to 1 5 illustrates an example of a mobile heavy-duty crane system according to the present invention. Figure 1 In the middle, the crane 1 is arranged on the circular slewing track assembly 50.

[0112] Crane 1 includes:

[0113] - A crane bracket, comprising a base 10, a first rotating base 11, and a second rotating base 12, the first and second rotating bases being arranged and configured to support the base 10 thereon, each base 11, 12 rotating relative to the base about a corresponding first vertical base rotation axis and a second vertical base rotation axis 13, 14, respectively.

[0114] Each base frame 11, 12 has a group of one or more track engagement members, such as one or more sliding members 15, 16, 17, 18, on opposite sides of the corresponding rotation axes 13, 14. Each group of track engagement members is configured to engage with a corresponding track of the crane track assembly, wherein each track engagement member 15, 16, 17, 18 pivots relative to the corresponding base frame about a corresponding vertical pivot axis 15a, 16a, 17a, 18a.

[0115] - Main hanger 20, which is pivotable about the main hanger pivot axis 21 relative to the base 10 of the crane bracket, and has a main hanger tip 22.

[0116] - Rear tower 30, which is pivotable relative to the base 10 of the crane bracket about a rear tower pivot axis 31, and has a rear tower tip 32.

[0117] - An adjustable length device 40 is located between the rear tower 30 and the main hanger 20.

[0118] - Counterweight 50, which is suspended on the rear tower 30.

[0119] The crane system also includes a rail assembly configured to be mounted on the ground and comprising:

[0120] - A circular rotary track assembly 100, which extends at least a segment of a rotary arc around a rotation center 101, and includes at least a pair of concentric first and second rotary tracks 102 and 103, and

[0121] - A straight crane track assembly 120, comprising at least a pair of parallel first straight crane tracks and second straight crane tracks 121, 122.

[0122] The track assembly is configured such that the linear track assembly 120 intersects with the circular rotary track assembly 100, wherein each linear crane track 121, 122 intersects with at least one circular rotary track at joints 131, 132, 133, 134 of the track assembly, so that in operation, the crane 1 can move on the linear track assembly 120 to a transfer position in which the track engagement members 15, 16, 17, 18 of the first and second rotating base frames 11, 12 are respectively arranged at joints 131, 132, 133, 134 of the track assembly, wherein the track engagement members are aligned with the corresponding circular rotary tracks 102, 103, thereby enabling the crane 10 to perform a rotary motion about a rotation center 101 when supported on the rotary track assembly.

[0123] The track device also includes a linear counterweight track assembly 140, which is configured to be arranged parallel to the linear crane track assembly 120 and preferably extends to the rotation center 101. The counterweight 50 includes a counterweight bracket 51, which is configured to move on the linear counterweight track assembly 140 together with the crane bracket of the crane 1 moving to the transfer position on the linear track assembly 120.

[0124] The circular rotary track assembly 100 is semi-circular and extends around the rotation center 101 on half of the circle.

[0125] The linear counterweight track assembly 140 intersects with the circular rotary track assembly 100, and here intersects with the end of the semi-circular rotary track assembly.

[0126] As is known in the art, the actual tracks of circular rotary track assembly 100, linear crane track assembly 120, linear counterweight track assembly 140, etc., can be arranged on a load distribution plate 70 placed on the ground. For example, a robust steel plate 70 can be used.

[0127] As is known in the art, preferably, the tracks of the circular rotary track assembly 100, the linear crane track assembly 120, the linear counterweight track assembly 140, etc., can be implemented for sliding. For example, track engagement members 15, 16, 17, and 18 are implemented as sliding members, configured to slide on the sliding surface of the track. For example, each track includes a sliding surface arranged between two slide rails, wherein a sliding actuator can engage with one or both of the slide rails and with a bracket to advance the crane or counterweight on the respective track.

[0128] In another embodiment, the track engagement members 15, 16, 17, 18 are implemented as wheels, which are configured to roll on a rolling surface similar to, for example, a railway track.

[0129] Preferably, the counterweight 50 is configured to be positioned in the slewing center 101 during lifting operations. As is known in the art, a swivel 52 is provided between the counterweight 50 and the connector 53 extending to the rear tower 30.

[0130] Figure 1 The implementation scheme makes the rotary track device have a first rotary track and a second rotary track 102, 103, wherein the first straight crane track and the second straight crane track 121, 122 intersect the first rotary track and the second rotary track at two joints respectively.

[0131] Crane 1 has a main lifting assembly, which includes at least one main lifting load connector (e.g., crane hook 200), a main lifting cable 201, and a main lifting winch 202, wherein the main lifting winch is mounted on the crane base 10. As is known in the art, crane 1 here has multiple main lifting winches and associated main cables, all of which support the crane hook 200 in a multi-rope arrangement, the crane hook 200 having, for example, a lifting capacity of more than 1,000 tons, such as about 5,000 tons in the example shown.

[0132] For example, crane 1 has a cantilever 25 as known in the art, which is pivotally connected to the tip of main hanger 20. The cantilever 25 is held in its desired orientation by a cable mechanism comprising a cantilever strut 26, a lower cable 27, and an upper cable 28. As known in the art, strut 26 is connected at its inner end to the tip of the main hanger, the lower cable 27 extends from the outer end of strut 26 to the inner or lower end of the main hanger 20, and the upper cable extends from the outer end of strut 26 to the tip of the cantilever 25, wherein the main lifting cable hangs from a pulley assembly.

[0133] The main hanger 20 is preferably modular, and more preferably has one or two lattice legs, such as the A-frame shown here.

[0134] The rear tower 30 is preferably modular, and more preferably has one or two lattice legs, such as the A-frame shown here.

[0135] The counterweight 50 may be composed of steel elements arranged in a bracket supported on a support 51.

[0136] Figure 1 and Figure 2 As shown, even after the crane 1 has moved onto the slewing track, the counterweight bracket 50 remains on the straight counterweight track assembly 140. The swivel 52 then enables the crane 1 to rotate around the slewing center 101.

[0137] Figure 1 and Figure 2 The crane system shown can be installed in a lifting yard, so the following methods can be used to lift and lower the load:

[0138] - Install a circular rotary track assembly 100 in the lifting area.

[0139] - Install a linear crane track assembly 120, which extends from the lifting location to the crane assembly location.

[0140] - Assemble crane 1 at the assembly site, including, for example, assembling the main gantry in the horizontal direction and raising the assembled main gantry to the raised position (see example). Figures 15a to 15i ),

[0141] - The assembled crane 1 is moved to a transfer position on the linear crane track assembly 120, in which the track engagement members 15, 16, 17, and 18 of the first and second rotating base frames are respectively arranged at the joints 131, 132, 133, and 134 of the track assembly, so that the track engagement members are aligned with the corresponding circular rotary tracks, thereby enabling the crane to perform a rotary motion around the rotation center when supported on the rotary track assembly.

[0142] Figures 3a to 3c The method described above is illustrated in which crane 1 is assembled at location A and then moved on track 120. Figure 3a The transfer position is shown. Here, the track engagement members 15, 16, 17, and 18 move from their alignment with track 120 to their alignment with track 100. This can be accomplished quite easily, especially for sliding members 15, 16, 17, and 18, because all that is needed at the engagement is the branch point on the track and the extended sliding surface at the engagement to allow members 15, 16, 17, and 18 to realign. Due to the load, such as the weight of the crane, the actuator 170 is set to perform a pivoting motion during this alignment (see [link]). Figure 3c Preferably, a sliding actuator, such as a hydraulic sliding actuator 170, is used for this alignment. In an embodiment, the same actuator 170 is used to slide the crane or counterweight on the relevant track.

[0143] Figure 4 and Figure 5 The diagram shows that crane 1 can be used not only with a two-rail linear crane assembly or a two-rail rotary crane assembly, but also with a three-rail rotary crane assembly. (See reference...) Figures 16 to 26The combined use of crane 1 with the slewing track assembly of the three tracks will be discussed in more detail. This is especially true due to the combination of the rotational function of the base frame 11, 12 of the crane 1's bracket with the pivoting function of components 15, 16, 17, 18.

[0144] exist Figure 5 The circular rotary track assembly 100 is shown to be a three-track assembly consisting of a first rotary track 101, a second rotary track 102, and a third rotary track 103, all of which are concentric circles.

[0145] The bracket positions the crane 1 on the slewing rails such that a set of rail engagement members 15 of the first slewing base 11 engages on the first slewing rail 101, another set of engagement members 16 of the first slewing base 11 engages on the second slewing rail 102, and a set of rail engagement members 17 of the second slewing base 12 engages on the second slewing rail 102, while another set of engagement members 18 of the second slewing base 12 engages on the third slewing rail 103. This allows the crane to perform slewing motion about the slewing center 101 when supported on the slewing rail assembly. The load is distributed more evenly compared to supporting the crane on only two slewing rails.

[0146] Figures 7 to 9 The illustration shows the raising and lowering of a load, such as a column in a refinery or other chemical plant.

[0147] Figure 10 A variant form is shown in which another straight crane rail 160 is adjacent to a circular rotary rail as an extension thereof, at an angle relative to crane rail 120, for example, perpendicular to crane rail 120 as shown here.

[0148] Figure 10 Another straight counterweight track 145 is shown extending parallel to another straight crane track 160 from the center of rotation 101, at an angle relative to track 140, for example, perpendicular to track 140 as shown here.

[0149] Figure 11a , Figure 11b and Figure 12A possible embodiment of the leg modules 300 of the main hanger 20 is shown. Each module 300 forms half of a leg segment and has two longitudinal chords 301, 302 interconnected by a lattice web 303 in a plane (preferably the top or bottom plane of the module). The side planes of the modules are formed by diagonal trusses 304, 305 that are serrated on the respective chords. The trusses are paired and adjacent at a connection point 306 away from the chords. The connection point 306 is provided with tabs that allow the two modules to engage through their connection point 306, for example by providing pins or bolts that pass through holes aligned in the tabs as shown herein.

[0150] For example, a module 300 can be transported on a truck trailer.

[0151] Figure 13 A counterweight 50 and an associated bracket 51 are shown, the bracket 51 having a base 51a and four sets of one or more track engagement members 55, 56, 57, 58, such as one or more sliding members. Each set of track engagement members is configured to engage with a corresponding track of the counterweight track assembly, and each track engagement member pivots relative to the base 51a about a corresponding vertical pivot axis 55a, 56a, 57a, 58a.

[0152] Figures 15a to 15i The main gantry 20 and cantilever 25 of the crane 1 are shown being horizontally assembled at an assembly location away from the slewing track 100 (e.g., at the end of track 120).

[0153] A conventional road-transport mobile telescopic gantry crane 400 is used to move the modules 300 of the gantry 25, as well as the modules of the cantilever 25 and other components such as the cantilever cable mechanism, during the assembly of the gantry 25.

[0154] The bracket of crane 1 is placed (e.g., assembled from components) on rail 120 at the assembly site, and then the main hanger 25 is constructed horizontally from the bracket toward the tip of the main hanger. The cantilever 25 and the associated cable mechanism are then assembled.

[0155] Figure 15f The assembly of the rear tower 30 is shown, also assembled modularly using a mobile crane 400. Preferably, the rear tower 30 is also assembled in the horizontal direction.

[0156] Figures 15g to 15i Further assembly of the crane 1 is shown. An adjustable length assembly 40 (also known as a pitch assembly) is disposed between the tip of the rear tower 30 and the tip of the main hanger 20, and includes, for example, a winch-operated cable assembly 41 and a suspension member 42 at the tip of the hanger 20.

[0157] As in Figure 15g As shown, the heavy body 50 can be assembled in a horizontal direction slightly offset from the rear tower.

[0158] Once the main components, such as the main gantry 20, rear tower 30, assembly 40, and main elevator, are assembled, the rear tower 30 is first raised and connected to the counterweight 50, which is moved into place below the tip of the tower 30. Then, the main gantry 20 and cantilever 25 are brought into the raised position using assembly 40, so that, for example, the crane hook 200 can be assembled first.

[0159] Figure 16 A dual mobile heavy-duty crane system is shown, comprising two cranes 1 as discussed above and a track system configured to be mounted on the ground to support the two cranes 1.

[0160] The track device includes a circular rotary track assembly extending at least one segment of a rotary arc around a rotation center, wherein the circular rotary track includes at least a first rotary track 101, a second rotary track 102, and a third rotary track 103 that are concentric.

[0161] For reference Figure 5 The crane base discussed is configured such that a set of track engagement members of the first rotating frame engages on a first slewing track, another set of engagement members of the first rotating frame engages on a second slewing track, and wherein the crane base is configured such that a set of track engagement members of the second rotating frame engages on the second slewing track, and another set of engagement members of the second rotating frame engages on a third slewing track.

[0162] The main hanger pivot axis 21 of the main hanger 20 of two cranes 1 is shown to be aligned with at least one relative position of the cranes 1 on the circular rotary track 100.

[0163] The track assembly also includes a circular counterweight track assembly 180 extending around a rotation center 101, the circular counterweight track assembly 180 being configured to be arranged concentrically with the circular rotary track assembly 100. Each counterweight 50 is provided with a bracket 51, the bracket 51 being configured to move on the circular counterweight track assembly 180, for example, moving together with the crane base of the crane 1, which moves on the rotary track assembly 100 during crane rotation.

[0164] Figures 22 to 26 The three-track rotary track assembly 100 is shown to be equally suitable for combination with a crane track assembly 120 having a first straight crane track and a second straight crane track 121, 122 that are parallel, for example, so that the assembly of the crane 1 can be located away from the rotary track assembly 100.

[0165] As shown, the first crane rail intersects the first and second slewing rails at at least one joint, and the second straight crane rail intersects the second and third slewing rails at at least one joint, so that in operation, each of the cranes 1 can move to a transfer position on the straight rail assembly, in which the rail engagement members of the first and second slewing frames are respectively arranged at the joint of the rail assembly, wherein the rail engagement members are aligned with the corresponding circular slewing rails, such that one set of rail engagement members of the first slewing frame engages on the first slewing rail, another set of engagement members of the first slewing frame engages on the second slewing rail, and one set of rail engagement members of the second slewing frame engages on the second slewing rail, and another set of engagement members of the second slewing frame engages on the third slewing rail, thereby enabling the crane to perform slewing motion about the center of rotation when supported on the slewing rail assembly.

[0166] Figure 17 , Figure 28 A dual-mobile heavy-duty crane system is shown, comprising two cranes 1 and two rail assemblies, each rail assembly being configured to be mounted on the ground to support one of the two cranes 1. The crane 1 shown here does not have a cantilever 25.

[0167] Here, each track device is configured to be mounted on the ground and includes a circular rotary track assembly 100 extending around a rotary center in at least a section of a rotary arc. The circular rotary track assemblies are spaced apart, for example, in the form of semi-circular rotary tracks having central regions close to each other and end regions facing away from each other. The load can then be lifted or lowered using two cranes 1 as illustrated herein.

Claims

1. A mobile heavy crane system comprising: - a crane (1) comprising: - a crane carriage comprising a base (10), a first rotating undercarriage (11) and a second rotating undercarriage (12) arranged and configured to support the base (10) thereon, each undercarriage (11, 12) being rotatable relative to the base about a respective first and second vertical undercarriage rotation axis (13, 14), wherein each undercarriage has one or more sets of track engaging members (15, 16, 17, 18) at opposite sides of the respective rotation axis (13, 14), each set of track engaging members being configured to engage with a respective track of a crane track assembly, wherein each track engaging member (15, 16, 17, 18) is pivotable relative to the respective undercarriage about a respective vertical pivot axis (15a, 16a, 17a, 18a), - a main boom (20) pivotable relative to the base of the crane carriage about a main boom pivot axis (21) and having a main boom tip (22), - a rear tower (30) pivotable relative to the base (10) of the crane carriage about a rear tower pivot axis (31) and having a rear tower tip (32), - an adjustable length device (40) between said rear tower (30) and said main boom (20), - a counterweight (50) suspended from said rear tower, - a track arrangement configured to be installed on the ground and comprising: - a circular slewing track assembly (100) extending around a slewing center over at least a slewing arc and comprising at least a pair of concentric first and second circular slewing tracks (101, 102), - a linear crane track assembly (120) comprising at least a pair of parallel first and second linear crane tracks (121, 122), wherein the track arrangement is implemented such that the linear crane track assembly (120) intersects the circular slewing track assembly (100), each linear crane track (121, 122) intersecting at least one circular slewing track at a track arrangement junction (131, 132, 133, 134) so as to enable, in operation, the crane (1) to be moved on the linear crane track assembly (120) to a transfer position in which the track engaging members (15, 16, 17, 18) of the first and second rotating undercarriages (11, 12) are each arranged at a track arrangement junction (131, 132, 133, 134) where the track engaging members can be aligned with the respective circular slewing track (101, 102) so as to enable the crane to perform a slewing movement about the slewing center when supported on the slewing track assembly.

2. The mobile heavy lift crane system of claim 1, wherein, The one or more sets of track engaging members (15, 16, 17, 18) of each undercarriage are implemented as one or more skid members (15, 16, 17, 18).

3. The mobile heavy lift crane system of claim 1, wherein, The track arrangement further comprises a linear counterweight track assembly (140) configured to be arranged parallel to the linear crane track assembly (120), wherein the counterweight (50) comprises a counterweight carriage (51) configured to move on the linear counterweight track assembly (140).

4. The mobile heavy lift crane system of claim 3, wherein, The counterweight carriage (51) is configured to move on the linear counterweight track assembly (140) in unison with a crane carriage of the crane (1) moving on the linear crane track assembly (120) towards the transfer position.

5. The mobile heavy lift crane system of claim 1, wherein, The circular slewing track assembly (100) is semi-circular and extends over half a circle around a slewing center.

6. The mobile heavy lift crane system of claim 4, wherein, The linear counterweight track assembly (140) intersects the circular slewing track assembly (100).

7. The mobile heavy lift crane system of claim 1, wherein, The counterweight (50) is configured to be arranged at the slewing center when performing a lifting operation; a swivel ring (52) is provided between the counterweight and the rear tower (30).

8. The mobile heavy lift crane system of claim 1, wherein, The crane (1) has a main hoist assembly comprising at least one main hoist load connector, a main hoist cable (201) and a main hoist winch (202), wherein the main hoist winch is mounted on the crane base (10).

9. The mobile heavy lift crane system of claim 1, wherein, The slewing track arrangement has a first and a second circular slewing track (101, 102), and a first and a second linear crane track (121, 122) intersecting the first and the second circular slewing track at two junctions, respectively.

10. The mobile heavy lift crane system of claim 1, wherein, The circular slewing track assembly (100) comprises concentric first, second and third circular slewing tracks (101, 102, 103), wherein the linear crane track assembly (120) has parallel first and second linear crane tracks (121, 122), wherein the first linear crane track (121) intersects the first and the second circular slewing track (101, 102) at at least one junction, and wherein the second linear crane track (122) intersects the second and the third circular slewing track (102, 103) at at least one junction, The counterweight (50) is configured to be arranged at the slewing center when performing a lifting operation; a swivel ring (52) is provided between the counterweight and the rear tower (30). so that in operation the crane (1) can be moved on the rectilinear crane rail assembly (120) to a transfer position in which the rail engaging members (15, 16, 17, 18) of the first and second rotating undercarriages (11, 12) are each arranged at the junctions of the rail arrangement, wherein the rail engaging members can be aligned with the respective circular slew rails (101, 102, 103) such that a set of rail engaging members (15) of the first rotating undercarriage (11) engages on the first circular slew rail (101), another set of rail engaging members (16) of the first rotating undercarriage (11) engages on the second circular slew rail (102), and such that a set of rail engaging members (17) of the second rotating undercarriage (12) engages on the second circular slew rail (102), another set of rail engaging members (18) of the second rotating undercarriage (12) engages on the third circular slew rail (103), thereby enabling the crane to perform a slewing movement about the slew center when supported on the circular slew rail assembly (100).

11. The mobile heavy lift crane system of claim 6, wherein, The rail arrangement further comprises a circular counterweight rail assembly (180) configured to be arranged concentrically with the circular slew rail assembly (100) and to extend about the slew center, the counterweight carriage (51) being configured to move on the circular counterweight rail assembly (180), wherein the counterweight carriage (51) comprises a plurality of sets of one or more rail engaging members (55, 56, 57, 58), each set of rail engaging members being configured to engage with respective rails of the rectilinear counterweight rail assembly (140) and the circular counterweight rail assembly (180), wherein each rail engaging member (55, 56, 57, 58) of the counterweight carriage (51) is pivotable about a respective vertical pivot axis (55a, 56a, 57a, 58a), wherein the rectilinear counterweight rail assembly (140) intersects the circular counterweight rail assembly (180) at the junctions, so that in operation the counterweight (50) can be moved to a transfer position in which the rail engaging members (55, 56, 57, 58) of the counterweight carriage (51) are each arranged at the junctions, wherein the rail engaging members can be aligned with respective rails of the circular counterweight rail assembly (180).

12. The mobile heavy lift crane system of claim 11, wherein, The counterweight carriage (51) is configured to move on the circular counterweight rail assembly (180) in unison with the crane base (10) of the crane (1) moving on the circular slew rail assembly (100) during slewing of the crane.

13. The mobile heavy lift crane system of claim 10, wherein, The rail arrangement further comprises a rectilinear counterweight rail assembly (140) configured to be arranged parallel to the rectilinear crane rail assembly (120), wherein the counterweight (50) comprises a counterweight carriage (51) configured to move on the rectilinear counterweight rail assembly (140), wherein the counterweight carriage (51) is configured to move in line with a crane carriage of the crane (1) moving towards a transfer position on the linear crane rail assembly (120) and on the linear counterweight rail assembly (140), wherein the linear counterweight rail assembly (140) intersects the circular slewing rail assembly (100), wherein the rail arrangement further comprises a circular counterweight rail assembly (180) configured to be arranged concentrically with the circular slewing rail assembly (100) and to extend around the slewing center, the carriage (51) being configured to move on the circular counterweight rail assembly (180), wherein the counterweight carriage (51) comprises a plurality of sets of one or more rail engaging members (55, 56, 57, 58), each set of rail engaging members being configured to engage with respective rails of the linear counterweight rail assembly (140) and the circular counterweight rail assembly (180), wherein each rail engaging member (55, 56, 57, 58) of the counterweight carriage (51) is pivotable about a respective vertical pivot axis (55a, 56a, 57a, 58a), wherein the linear counterweight rail assembly (140) intersects the circular counterweight rail assembly (180) at a junction so that in operation the counterweight (50) can move to a transfer position in which the rail engaging members (55, 56, 57, 58) of the counterweight carriage (51) are each arranged at the junction, wherein the rail engaging members can align with respective rails of the circular counterweight rail assembly (180).

14. The mobile heavy lift crane system of claim 13, wherein, The carriage (51) is configured to move on the circular counterweight rail assembly (180) in line with a crane base (10) of the crane (1) moving on the circular slewing rail assembly (100) during slewing of the crane.

15. A dual mobile heavy crane system comprising two cranes (1) and a rail arrangement configured to be installed on the ground to support the two cranes, wherein each of the two cranes (1) comprising: - a crane carriage comprising a base (10), a first rotating chassis (11) and a second rotating chassis (12), the first and second rotating chassis (11, 12) being arranged and configured to support the base (10) thereon, each chassis being rotatable relative to the base about a respective first and second vertical chassis rotation axis (13, 14), wherein each chassis has at opposite sides of the respective rotation axis (13, 14) a set of one or more rail engaging members (15, 16, 17, 18), each set of rail engaging members being configured to engage with respective rails of a crane rail assembly, wherein each rail engaging member is pivotable relative to the respective chassis about a respective vertical pivot axis, - a main trolley (20) being pivotable relative to the base of the crane carriage about a main trolley pivot axis (21) and having a main trolley tip (22), - a rear tower (30) which is pivoted relative to a base (10) of the crane carrier about a rear tower pivot axis (31) and which has a rear tower tip (32), - an adjustable length device (40) between the rear tower (30) and the main boom (20), - counterweights (50) suspended from the rear tower, wherein the track arrangement comprises: - a circular slewing track assembly (100) extending at least a slewing arc about a slewing center, wherein the circular slewing track assembly (100) comprises at least a first, a second and a third concentric circular slewing track (101, 102, 103), wherein the second circular slewing track (102) is in between the first (101) and the third circular slewing track (103), and wherein the crane base (10) is configured such that a set of track engaging members (15) of the first rotating chassis (11) engages on the first circular slewing track (101) and another set of engaging members (16) of the first rotating chassis (11) engages on the second circular slewing track (102), and wherein the crane base (10) is configured such that a set of track engaging members (17) of the second rotating chassis (12) engages on the second circular slewing track (102) and another set of engaging members (18) of the second rotating chassis (12) engages on the third circular slewing track (103).

16. The dual mobile heavy lift crane system of claim 15, wherein, The set of one or more track engaging members (15, 16, 17, 18) of each chassis is embodied as one or more sliding members (15, 16, 17, 18).

17. The dual mobile heavy lift crane system of claim 15, wherein, The main boom pivot axis (21) of the crane (1) is aligned in at least one relative position of the crane to each other on the circular slewing track assembly (100).

18. The dual mobile heavy lift crane system of claim 15, wherein, The track arrangement further comprises a circular counterweight track assembly (180) which is configured to be arranged concentrically to the circular slewing track assembly (100) and to extend about the slewing center, and wherein each counterweight (50) is configured to move on the circular counterweight track assembly.

19. The dual mobile heavy lift crane system of claim 18, wherein, Each counterweight is configured to move on the circular counterweight track assembly in unison with the crane base (10) of the crane (1) moving on the circular slewing track assembly (100) during slewing of the crane.

20. The dual mobile heavy lift crane system of claim 15, wherein, The circular slewing track assembly (100) comprises concentric first, second and third circular slewing tracks (101, 102, 103), wherein the rectilinear crane track assembly (120) has parallel first and second rectilinear crane tracks (121, 122), wherein the first rectilinear crane track (121) intersects the first (101) and the second (102) circular slewing track at at least one joint, and wherein the second rectilinear crane track (102) intersects the second (102) and the third (103) circular slewing track at at least one joint, so that in operation the crane (1) can be moved on the rectilinear crane track assembly (120) to a transfer position in which the track engaging members (15, 16, 17, 18) of the first and second rotating undercarriages (11, 12) are each arranged at the junctions of the track arrangement, wherein the track engaging members (15, 16, 17, 18) can be aligned with the respective circular slew tracks (101, 102, 103) so that a set of track engaging members (15) of the first rotating undercarriage (11) engages on the first circular slew track (101), another set of engaging members (16) of the first rotating undercarriage (11) engages on the second circular slew track (102), and so that a set of track engaging members (17) of the second rotating undercarriage (12) engages on the second circular slew track (102), another set of engaging members (18) of the second rotating undercarriage (12) engages on the third circular slew track (103), thereby enabling the crane to perform a slewing movement around the slew center when supported on the circular slew track assembly (100).

21. The dual mobile heavy lift crane system of claim 19, wherein, The counterweight carriage (51) comprises a plurality of sets of one or more track engaging members (55, 56, 57, 58), each set of track engaging members being configured to engage with respective tracks of the rectilinear counterweight track assembly (140) and the circular counterweight track assembly (180), wherein each track engaging member pivots about a respective vertical pivot axis (55a, 56a, 57a, 58a), wherein the rectilinear counterweight track assembly (140) intersects the circular counterweight track assembly (180) at the junctions, so that in operation the counterweight (50) can be moved to a transfer position in which the track engaging members (55, 56, 57, 58) of the counterweight carriage (51) are each arranged at the junctions, wherein the track engaging members can be aligned with the respective circular counterweight tracks of the circular counterweight track assembly (180).

22. The dual mobile heavy lift crane system of claim 21, wherein, The plurality of sets of one or more track engaging members (55, 56, 57, 58) are implemented as one or more sliding members.

23. A mobile heavy crane system comprising a crane (1) and a track arrangement configured to be installed on the ground to support the crane, wherein, The crane (1) comprises: - a crane carriage comprising a base (10), a first rotating undercarriage (11) and a second rotating undercarriage (12), the first and second rotating undercarriages (11, 12) being arranged and configured to support the base (10), each undercarriage (11, 12) being rotatable relative to the base about a respective first and second vertical undercarriage rotation axis (13, 14), wherein each chassis (11, 12) has one or more sets of track engaging members (15, 16, 17, 18) at opposite sides of the respective axis of rotation (13, 14), each set of track engaging members being configured to engage with a respective track of a track assembly of the crane, wherein each track engaging member (15, 16, 17, 18) is pivotal relative to the respective chassis about a respective vertical pivot axis (15a, 16a, 17a, 18a), - a main boom (20) pivotal relative to the base (10) of the crane carrier about a main boom pivot axis (21) and having a main boom tip (22), - a rear tower (30) pivotal relative to the base (10) about a rear tower pivot axis (31) and having a rear tower tip (32), - an adjustable length device between said rear tower (30) and said main boom (20), - a counterweight (50) suspended from said rear tower (30), wherein said track arrangement comprises: - a circular slewing track assembly (100) extending around a slewing center at least a slewing arc, wherein said circular slewing track assembly (100) comprises at least a first, a second and a third concentric circular slewing track (101, 102, 103), wherein the second circular slewing track (102) is in between the first and third circular slewing tracks (101, 103), wherein the crane base (10) is configured such that one set of track engaging members (15) of the first rotating chassis (11) selectively engages with the first or third circular slewing track (101, 103) and another set of engaging members (16) of the first rotating chassis (11) engages with the second circular slewing track (102); and wherein the crane base (10) is configured such that one set of track engaging members (17) of the second rotating chassis (12) engages with the second circular slewing track (102) and another set of engaging members (18) of the second rotating chassis (12) engages with the third or first circular slewing track (103, 101) when the set of track engaging members (15) of the first rotating chassis (11) engages with the first or third circular slewing track (101, 103).

24. The mobile heavy lift crane system of claim 23, wherein, The one or more sets of track engaging members (15, 16, 17, 18) of each chassis are embodied as one or more skid members (15, 16, 17, 18).

25. A double mobile heavy crane system comprising two cranes (1) and two track arrangements, each track arrangement being installed on the ground to support one of the two cranes, wherein each crane (1) comprising: - a crane carriage comprising a base (10), a first rotating chassis (11) and a second rotating chassis (12), the first and second rotating chassis (11, 12) being adapted to support the base (10), each chassis being rotatable relative to the base about a respective first and second vertical chassis rotation axis (13, 14), wherein each chassis (11, 12) has one or more sets of track engaging members (15, 16, 17, 18) at opposite sides of the respective rotation axis (13, 14), each set of track engaging members being configured to engage with a respective track of a crane track assembly, wherein each track engaging member (15, 16, 17, 18) is pivotable relative to the respective chassis (11, 12) about a respective vertical pivot axis (15a, 16a, 17a, 18a), - a main boom (20) being pivotable relative to the base (10) of the crane carriage about a main boom pivot axis (21) and having a main boom tip (22), - a rear tower (30) being pivotable relative to the base (10) of the crane carriage about a rear tower pivot axis (31) and having a rear tower tip (32), - an adjustable length device (40) between said rear tower (30) and said main boom (20), - a counterweight (50) suspended from said rear tower (30), wherein each track device is installed on the ground and comprises: - a semi-circular slew track assembly extending a slew arc about a slew center, wherein the semi-circular slew track assembly has a central region and an end region, wherein the semi-circular slew track assemblies are spaced apart such that the central regions of the semi-circular slew track assemblies are close to each other and the end regions are facing away from each other.

26. The dual mobile heavy lift crane system of claim 25, wherein, The one or more sets of track engaging members (15, 16, 17, 18) of each chassis are embodied as one or more skid members (15, 16, 17, 18).

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