CN115432595A - Ultra-large tower crane - Google Patents

Abstract

The invention discloses an ultra-large tower crane, which comprises a flat-head tower crane (100) with a horizontal boom (1) and a movable-arm tower crane (200) arranged above the top of the flat-head tower crane, wherein the movable-arm tower crane comprises a movable arm (8) capable of pitching and amplitude changing, and the movable arm and the horizontal boom can horizontally rotate independently from each other. The ultra-large tower crane is characterized in that a movable arm tower crane is additionally arranged at the top of the tower crane on the basis of a flat-head tower crane, the two cranes are combined and can flexibly and independently operate, the movable arm tower crane is small in size and strong in flexibility, the defects of insufficient operation space and the like caused by the fact that the flat-head tower crane is easy to interfere with surrounding buildings can be effectively overcome, and the movable arm tower crane is used as an independent crane, is flexible in operation and larger in hoisting weight, and is particularly suitable for dismounting operation of self parts and surrounding parts of the tower crane and maintenance operation of the tower crane.

Description

Ultra-large tower crane

Technical Field

The invention belongs to the field of construction machinery, and particularly relates to an ultra-large tower crane.

Background

The tower crane is widely applied to various construction projects, is used for hoisting various building elements on the ground to the top of a building object under construction, and can greatly improve the operation efficiency. However, with the continuous improvement of the building height and the worse environment such as mountain land construction, the tower crane with the common specification is not suitable for use, and accordingly, the requirements on the specification, the operation height and the like of the tower crane are continuously improved, and the ultra-large tower crane needs to be taken at the right moment.

Disclosure of Invention

Aiming at the defects or shortcomings of the prior art, the invention provides an ultra-large tower crane which is suitable for construction engineering environments with higher requirements and is flexible and convenient to disassemble, assemble and maintain.

In order to achieve the above object, the present invention provides a very large tower crane, which includes a flat-head tower crane having a horizontal boom and a luffing tower crane installed above the top of the flat-head tower crane, wherein the luffing tower crane includes a luffing jib capable of luffing, and the luffing jib and the horizontal boom are capable of horizontally revolving independently of each other.

In some embodiments, the flathead tower crane comprises a tower crane slewing assembly and a tower head extending upwardly from the tower crane slewing assembly;

and, the luffing tower crane comprises:

the machine base is arranged on the tower head and is provided with a movable arm slewing mechanism;

the movable arm is pivotally arranged on the machine base and can horizontally rotate along with the movable arm slewing mechanism; and

and the pitching amplitude-changing mechanism is used for driving the movable arm to pitch and change amplitude.

In some embodiments, the flathead tower crane comprises a tower body, the tower body comprises a plurality of tower body standard sections which are stacked and spliced in sequence along the height direction, and the tower crane slewing assembly is installed on the tower body standard section at the top end.

In some embodiments, the flathead tower crane comprises a plurality of attachment frames arranged at intervals along the height direction of the tower body and used for fixing the tower body to a building, wherein each attachment frame comprises an attachment frame hooped on the standard knot side of the tower body and a support rod extending outwards from the attachment frame.

Optionally, the horizontal extension of the stay is smaller than the horizontal extension of the horizontal jib.

Optionally, the attachment frame is connected with the stay bar through an attachment frame pin shaft, and a pin shaft sensor for detecting shearing force is installed on the attachment frame pin shaft.

In some embodiments, the boom is a telescoping arm.

In one embodiment, the luffing tower crane is a mast crane.

In some embodiments, the horizontal jib of the flat-head tower crane and the boom of the luffing tower crane are each capable of 360 ° horizontal slewing.

In some embodiments, the flat-top tower crane comprises a balance arm, the balance arm and the horizontal jib arm being both mounted on the tower head and driven by the tower slewing assembly to slew horizontally.

In some embodiments, the flathead tower crane comprises a tower crane luffing system comprising:

the luffing rope winding mechanism comprises a luffing drum fixedly arranged on the balance arm and a tower crane luffing rope wound on the luffing drum; and

the double-amplitude vehicle group comprises a first connecting plate, a second connecting plate, a first amplitude trolley and a second amplitude trolley, wherein the first amplitude trolley and the second amplitude trolley can walk along the horizontal cargo boom;

one end of the tower crane luffing rope extends from the root of the horizontal jib boom to the second luffing trolley and is connected with the second connecting plate, and the other end of the tower crane luffing rope bypasses the arm tip of the horizontal jib boom, extends towards the first luffing trolley and is connected with the first connecting plate, so that the first luffing trolley and the second luffing trolley can synchronously luff or independently luff.

In some embodiments, the respective roping systems of the luffing tower crane and the flathead tower crane are independent of each other.

In some embodiments, the top of the flat-head tower crane is provided with a power transformation device and a high-voltage cable storage device, and the bottom of the flat-head tower crane is provided with a high-voltage control device, the high-voltage control device is connected with the power transformation device through a high-voltage cable, and the high-voltage cable is wound on the high-voltage cable storage device.

In some embodiments, the rated lifting moment of the flathead tower crane is not less than 10000 tons and the maximum lifting height is not less than 370 meters.

In some embodiments, the luffing tower crane has a maximum capacity of no less than 30 tons.

According to the ultra-large tower crane, the traditional derrick mast structure design is abandoned, the swing arm tower crane is additionally arranged on the top of the tower crane on the basis of the flat-head tower crane, a double-crane combination form is formed, the swing arm tower crane and the tower crane are respectively and flexibly operated independently, the defects that the flat-head tower crane is easy to interfere with peripheral buildings and the operation space is insufficient are overcome through the small size and flexibility of the swing arm tower crane, the hoisting weight can be greatly increased compared with that of a derrick mast mechanism when the swing arm tower crane is used as an independent crane, and the crane is particularly favorable in the dismounting process and the self maintenance process of self parts and peripheral parts of the tower crane.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a front view of an oversized tower crane, according to an embodiment of the present invention;

FIG. 2 is an enlarged partial view of the upper portion of the very large tower crane shown in FIG. 1;

FIG. 3 is a schematic structural view of the ultra-large tower crane shown in FIG. 1 during the disassembly and assembly of the attachment frame;

FIG. 4a is a schematic structural view of an attachment frame;

FIG. 4b isbase:Sub>A cross-sectional view A-A of the attachment bracket shown in FIG. 4base:Sub>A;

FIG. 5 is a schematic structural diagram of a standard section of a tower body;

FIG. 6 is a schematic structural view of a horizontal jib boom;

FIG. 7 is a schematic view of the structure of the balance arm;

FIG. 8 is a schematic structural diagram of a tower crane luffing system of a very large tower crane;

FIGS. 9a and 9b are a front view and a top view, respectively, of a dual horn stack of a tower crane horn system;

fig. 10a is a schematic structural diagram of a high-voltage power-on system of the ultra-large tower crane shown in fig. 1;

fig. 10b is a schematic structural view of the high-voltage cable housing device provided in the tower body.

Description of reference numerals:

100. 200 luffing jib tower crane of flat-head tower crane

1. Horizontal crane boom 2 balance arm

3. Tower body 4 tower head

5. Tower machine gyration assembly 6 machine base

7. Movable arm swing mechanism 8 movable arm

9. Mast 10 hoisting mechanism

11. Swing arm luffing rope 12 swing arm hoisting rope

13. Luffing rope of luffing drum 14 tower crane

15. First amplitude variation trolley 16 and second amplitude variation trolley

17. First connecting plate 18 second connecting plate

19. Transformer device 20 high tension cable storage device

21. High-voltage control device 22 high-voltage cable

23. 24 climbing frame of introducing mechanism

25. Jacking mechanism

31. Tower body standard knot 32 attachment frame

321. Stay bar of attachment frame 322

323. Attachment frame pin 324 pin sensor

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the embodiments of the present invention, unless otherwise specified, the use of directional terms such as "upper, lower, top, and bottom" generally refer to the orientation shown in the drawings or to the positional relationship of the components relative to each other in the vertical, or gravitational direction.

The invention will be described in detail below with reference to exemplary embodiments and with reference to the accompanying drawings.

As shown in fig. 1 and 2, in an exemplary embodiment of the present invention, there is provided an ultra-large tower crane including a flathead tower crane 100 having a horizontal boom 1 and a luffing tower crane 200 installed above a top of the flathead tower crane 100, wherein the luffing tower crane 200 includes a luffing jib 8, and the luffing jib 8 and the horizontal boom 1 are horizontally rotatable independently of each other.

As is well known to those skilled in the art, a tower crane of a common size is typically several tens of meters in height, and its own components or peripheral components are relatively light in weight, at most several tons, and can be installed and removed by a derrick mast mechanism simply installed on the top of the tower crane. However, in the design process of the ultra-large tower crane, the size and the specification of the tower crane are greatly improved, the height of a tower body and the length of a horizontal arm are greatly extended, interference with surrounding buildings and the like is more easily caused, the weight and the volume of various self structural components such as a standard section of the tower body are greatly improved, and a common derrick mast mechanism is difficult to adapt to various aspects such as hoisting weight, flexibility and the like.

Comparatively, for the design of the ultra-large tower crane, the height and the hoisting load are significantly increased compared with the conventional tower crane, for example, the rated hoisting moment of the flat-head tower crane 100 shown in the embodiment is not less than 10000 tons and the maximum hoisting height is not less than 370 meters. Therefore, in the present invention, instead of providing a simple gin pole mechanism on the balance arm 2 of the flathead tower crane 100 to hoist an object with a small weight, a hammerhead tower crane is not used, and the flathead tower crane 100 capable of carrying the boom tower crane 200 is used. On the basis of the flat-head tower crane, an independent luffing jib tower crane 200 is additionally arranged at the top of the tower crane. Thus, in the combined double-machine structure, the respective division of labor is clear, the flat-head tower crane 100 can rotate in a large range and lift in a large tonnage in the construction process, the movable arm tower crane 200 can make up for the defects of the horizontal lifting arm 1 by using the flexible maneuverability of the movable arm 8, and plays an essential role in the aspects of small component mounting and dismounting, rod member mounting and dismounting, main crane maintenance and the like. In the present embodiment, the maximum lifting capacity of the boom tower crane 200 is not less than 30 tons and greatly exceeds the lifting capacity of a general derrick mast mechanism, and the boom 8 is more flexibly maneuvered by pitching, horizontally revolving, and the like.

To realize the double-crane combination and independent operation, the luffing tower crane 200 is installed directly above the tower body 3 in this embodiment. As shown in fig. 1 and 2, the flat-top tower crane 100 includes a tower crane slewing assembly 5 and a tower head 4 extending upward from the tower crane slewing assembly 5; wherein, the balance arm 2 and the horizontal crane arm 1 are both arranged on the tower head 4 and driven by the tower crane rotation assembly 5 to realize horizontal rotation.

Accordingly, the luffing tower crane 200 includes:

the machine base 6 is arranged on the tower head 4 and is provided with a movable arm slewing mechanism 7;

the movable arm 8 is pivotally arranged on the machine base 6, and can horizontally rotate along with the arm rotating mechanism 7; and

and the pitching amplitude-changing mechanism is used for driving the movable arm 8 to pitch and change amplitude.

Therefore, the swing arm swing mechanism 7 and the tower crane swing assembly 5 are coaxially arranged, so that the whole structure is more stable, the stress is balanced and reliable, the swing arm 8 and the horizontal crane arm 1 can concentrically pivot, and the swing arm 8 of the swing arm tower crane can be conveniently operated together to perform auxiliary lifting operation. In the present embodiment, the horizontal boom 1 of the flat-head tower crane 100 and the boom 8 of the luffing tower crane 200 are each capable of 360 ° horizontal slewing.

In the embodiment of fig. 1 and 2, boom tower crane 200 is a mast crane, but is not limited thereto. The pitching luffing mechanism can comprise a mast 9, a hoisting mechanism 10 and a movable arm luffing rope 11, wherein the movable arm luffing rope 11 wound on the hoisting mechanism 10 extends to the tail end of the movable arm 8 beyond a fixed pulley on the mast 9 to pull the movable arm 8 to pivot around the crane arm root part of the movable arm along a vertical plane, namely, pitching luffing is performed, so as to adjust the horizontal distance between the crane arm tail end and the crane arm root part. After reaching the set amplitude angle position, the hoisting mechanism 10 can drive the movable arm hoisting rope 12 to pull the lifting hook hanging from the tail end of the driven arm 8, so as to perform auxiliary hoisting operation.

The respective rope winding systems of the luffing jib tower crane 200 and the topping tower crane 100 are independent of each other, that is, the respective luffing rope winding systems and the hoisting rope winding systems are not interfered with each other, and the luffing jib tower crane and the topping tower crane are convenient, independent and flexible to control.

In addition, different from the way that a part of the tower crane sets the tower crane slewing assembly at the bottom of the tower body so as to integrally slew the tower body and the horizontal jib, the tower crane slewing assembly 5 in the embodiment is arranged at the top of the tower body 3 so as to enable the horizontal jib 1 to be capable of hoisting more flexibly and conveniently, and the driving force of horizontal pivoting is smaller. Wherein, the body of the tower 3 includes and piles up a plurality of body of the tower standard festival 31 of concatenation in proper order along the direction of height, and the structure of body of the tower standard festival 31 is shown as figure 5, and tower machine gyration assembly 5 mountable is on the body of the tower standard festival 31 of body of the tower topmost.

Because the rated lifting capacity of the flat-head tower crane 100 is extremely large and the height of the tower body can be as high as hundreds of meters, the structural size of the standard section 31 of the tower body which forms the tower body 3 is large, and the single weight is also large, for example, the length, the width and the height of the standard section 31 of the single tower body are not less than 6m, and the single body can reach several tons. Similarly, the same applies to the arm sections constituting the horizontal boom 1 or the counter balance arm 2. Referring to fig. 5 to 7, the columns, web members, etc. constituting the tower body standard section 31 are detachably mounted so as to be easily disassembled and transported. The arm sections of the horizontal crane arm 1 or the balance arm 2 are also assembled in a split hinged mode. Referring to fig. 1, the tower body standard knot 31 can be continuously jacked and added to a knot by a jacking mechanism 25 in the climbing frame 24, so that the tower body standard knot 31 can be gradually stacked and climbed to reach the required tower body height. Wherein, other parts and the like can be lifted in an auxiliary way through the introducing mechanism 23.

As described above, the ultra-large tower crane is up to several hundreds of meters, and thus, in addition to the larger size and higher structural strength of the tower body standard knot 31, a plurality of attachment frames 32 for fixing the tower body 3 to a building under construction at a side are generally arranged at intervals in the height direction of the tower body 3 during the construction process, as shown in fig. 3. Referring to fig. 3 and 4a, the attachment frame 32 generally comprises an attachment frame 321 hooped around the standard tower section 31 and a brace 322 extending outwardly from the attachment frame 321, the brace 322 being connected at its distal end to the building.

Referring to fig. 4b, the attachment frame 321 is connected to the support rod 322 by an attachment frame pin 323, and a pin sensor 324 for detecting a shearing force is further installed on the attachment frame pin 323. Therefore, under severe conditions such as strong wind, earthquake and the like, the stability of the tower crane can be monitored, the safety and reliability of the whole machine operation are improved, and the method is particularly important for the ultra-large tower crane with large lifting capacity and ultra-high height.

As shown in fig. 3, since the building is closer to the tower 3, the horizontal distance between the two is the horizontal extension length of the brace 322, and the horizontal extension length of the brace 322 is generally smaller than that of the horizontal boom 1. Thus, a building built to a certain height will prevent the complete revolution of the horizontal boom 1. The fallen building interferes with the horizontal rotation of the horizontal boom 1, so that the horizontal boom 1 is difficult to rotate to a position close to the building and directly above the stay bar 322 of the attachment frame 32, and cannot be conveniently used for lifting the attachment frame 32 and the like when the tower crane is detached from the tower crane. At this time, the boom tower crane 200 can drive the boom 8 at a position higher than the horizontal boom 1 to swing flexibly so as to avoid mechanical interference with the building. During operation, the luffing mechanism can drive the movable arm 8 to reach a luffing angle setting position, and drive the movable arm 8 to rotate to a position right above the brace 322 of the attachment frame 32 until the brace 322 can be lifted by a lifting hook at the tail end of the movable arm 8, and the like, so as to assist in completing the dismounting operation of peripheral components of the tower crane.

In an alternative embodiment, the boom 8 may also be a telescopic boom, for example, a sliding nest is formed between the connected boom sections, so that the boom can be telescopic under the action of the hydraulic oil cylinder, and thus the amplitude can be changed.

The one-time hoisting load of the ultra-large tower crane is large, more objects are hoisted, and in order to realize more flexible translational amplitude variation control, a double amplitude variation vehicle set is also adopted in the tower crane amplitude variation system of the embodiment. Referring to fig. 1 and 8, the tower crane luffing system of the flathead tower crane 100 includes a luffing rope winding mechanism, which includes a luffing drum 13 fixedly disposed on the balance arm 2 and a tower crane luffing rope 14 wound on the luffing drum 13. As shown in fig. 8, 9a and 9b, the double luffing jib group comprises a first connecting plate 17, a second connecting plate 18, and a first luffing trolley 15 and a second luffing trolley 16 which can travel along the horizontal jib 1, wherein two ends of the first connecting plate 17 are detachably connected between a first side of the first luffing trolley 15 and a first side of the second luffing trolley 16, and two ends of the second connecting plate 18 are detachably connected between a second side of the first luffing trolley 15 and a second side of the second luffing trolley 16; one end of the tower crane luffing rope 14 extends from the root of the horizontal jib 1 to the second luffing trolley 16 and is connected with the second connecting plate 18, and the other end of the tower crane luffing rope 14 extends around the arm tip of the horizontal jib 6 to the first luffing trolley 15 and is connected with the first connecting plate 17.

Specifically, the synchronous amplitude variation of the first amplitude variation trolley 15 and the second amplitude variation trolley 16 can be realized by pulling the tower crane amplitude variation rope 14 through the amplitude variation winding drum 13; when one end of the connecting plate is detached from one of the first luffing trolley 15 and the second luffing trolley 16, the luffing drum 13 pulls the tower crane luffing rope 14 to realize independent luffing of the other one of the first luffing trolley 15 and the second luffing trolley 16, so that synchronous luffing and independent luffing of the first luffing trolley 15 and the second luffing trolley 16 can be realized simultaneously through the luffing rope winding mechanism shown in fig. 8, the hoisting movement of the tower crane is more flexible, and the universality is higher.

Referring to fig. 10a and 10b, in the present embodiment, the flathead tower crane 100 is further provided with a power transformation device 19 and a high voltage cable storage device 20 at the top and a high voltage control device 21 at the bottom, the high voltage control device 21 is connected to the power transformation device 19 through a high voltage cable 22, and the high voltage cable 22 is wound around the high voltage cable storage device 20.

In a conventional tower crane, a box-type substation is placed on the ground, high voltage electricity is converted into low voltage electricity to supply power to the tower crane, and for an ultra-large tower crane with higher height and larger power, the adoption of the scheme can cause larger voltage drop of cables, the sectional area or the number of the cables needs to be increased, the cost is increased, the cable loss is caused when the cables are used for a longer time, and the difficulty of field wiring and jacking operation is also improved. Moreover, the super-large tower crane has a large bearing capacity, and in order to meet the large bearing demand, a large-power motor or control device needs to be arranged on the upper part of the tower crane, and at this time, if a power supply scheme of a common tower crane is adopted, that is, a low-voltage power supply (for example, 380V) is arranged on the ground, and a common cable is adopted to supply power to top electric equipment of the large tower crane, for example, the current demand of the electric equipment is 1600A, and the number range of the common cables which need to be used is 10 to 20. Under the condition that the height of the ultra-large tower crane is high, the cables with the number can cause field wiring difficulty, complex circuits and high cost, and the wiring workload of workers is greatly increased.

In this embodiment, through setting up high voltage control device 21 on ground, set up transformer 19 on the upper portion of super large tower crane, and adopt high tension cable 22 to connect high voltage control device 21 and transformer 19 electricity, make the power supply system who is used for super large tower crane only adopt a small amount of high tension cable 22 just can carry the upper portion of super large tower crane with the high tension electricity from ground, and convert high tension electricity into low tension electricity through transformer 19, in order to satisfy the power consumption demand of super large tower crane's upper portion consumer, the operating stability of power supply system has been guaranteed, and the wiring degree of difficulty of cable has been reduced by a wide margin, staff's wiring work load has been alleviateed, wiring efficiency has been promoted.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.

It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the embodiments of the present invention do not describe any combination of the features.

In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.

Claims (10)

1. A very large tower crane, characterized in that it comprises a flat head tower crane (100) with a horizontal jib (1) and a luffing tower crane (200) mounted above the top of the flat head tower crane (100), the luffing tower crane (200) comprising a luffing jib (8), the luffing jib (8) and the horizontal jib (1) being horizontally rotatable independently of each other.

2. The very large tower crane according to claim 1, wherein the flathead tower crane (100) comprises a tower crane slewing assembly (5) and a tower head (4) projecting upwards from the tower crane slewing assembly (5);

the boom tower crane (200) further comprises:

the machine base (6) is installed on the tower head (4) and is provided with a movable arm swing mechanism (7);

the movable arm (8) is pivotally mounted on the machine base (6) and can horizontally rotate along with the movable arm slewing mechanism (7); and

and the pitching amplitude-changing mechanism is used for driving the movable arm (8) to pitch and change amplitude.

3. The very large tower crane according to claim 2, characterized in that the flathead tower crane comprises a tower body (3), the tower body (3) comprises a plurality of tower body standard knots (31) which are stacked and spliced in sequence along the height direction, and the tower crane slewing assembly (5) is mounted on the tower body standard knot (31) at the top end.

4. The very large tower crane according to claim 3, characterized in that the flathead tower crane (100) comprises a plurality of attachment frames (32) arranged at intervals in the height direction of the tower body (3) and used for fixing the tower body (3) to a building, wherein the attachment frames (32) comprise attachment frames (321) hooped on the periphery of the tower body standard knot (31) and stay bars (322) extending outwards from the attachment frames (321).

5. Ultra-large tower crane according to claim 4, characterized in that the horizontal extension of the stay (322) is smaller than the horizontal extension of the horizontal jib (1).

6. The very large tower crane according to claim 4, wherein the attachment frame (321) is connected to the brace rod (322) by an attachment frame pin (323), and a pin sensor (324) for detecting shear force is installed on the attachment frame pin (323).

7. The very large tower crane according to claim 2, characterized in that the horizontal jib (1) of the flat-head tower crane (100) and the jib (8) of the luffing tower crane (200) are each capable of 360 ° horizontal slewing.

8. The very large tower crane according to claim 2, characterized in that the flat-top tower crane (100) comprises a balance arm (2), the balance arm (2) and the horizontal jib (1) being mounted on the tower head (4) and driven to swivel horizontally by the tower slewing assembly (5).

9. The very large tower crane according to claim 8, wherein the flathead tower crane (100) comprises a tower crane luffing system comprising:

the luffing rope winding mechanism comprises a luffing drum (13) fixedly arranged on the balance arm (2) and a tower crane luffing rope (14) wound on the luffing drum (13); and

the double-amplitude-variable vehicle group comprises a first connecting plate (17), a second connecting plate (18), a first amplitude-variable trolley (15) and a second amplitude-variable trolley (16) which can walk along the horizontal crane boom (1), wherein two ends of the first connecting plate (17) are respectively detachably connected between the first side of the first amplitude-variable trolley (15) and the first side of the second amplitude-variable trolley (16), and two ends of the second connecting plate (18) are respectively detachably connected between the second side of the first amplitude-variable trolley (15) and the second side of the second amplitude-variable trolley (16);

one end of the tower crane luffing rope (14) extends from the root of the horizontal crane boom (1) to the second luffing trolley (16) and is connected with the second connecting plate (18), and the other end of the tower crane luffing rope (14) bypasses the arm tip of the horizontal crane boom (6), extends to the first luffing trolley (15) and is connected with the first connecting plate (17), so that the first luffing trolley (15) and the second luffing trolley (16) can synchronously luffing or independently luffing.

10. The very large tower crane according to any one of claims 1 to 9, wherein the flat head tower crane (100) is provided with a power transformation device (19) and a high voltage cable storage device (20) at the top and a high voltage control device (21) at the bottom, the high voltage control device (21) is connected with the power transformation device (19) through a high voltage cable (22), and the high voltage cable (22) is wound on the high voltage cable storage device (20).

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