Super large tower crane

Abstract

The application discloses a super-large tower crane, which comprises a flat-top tower crane (100) with a horizontal lifting arm (1) and a luffing tower crane (200) installed above the top of the flat-top tower crane, the luffing tower crane comprising a luffing boom (8) capable of luffing, and the luffing boom and the horizontal lifting arm being capable of horizontal slewing independently of each other. The super-large tower crane of the application adds the luffing tower crane on the basis of the flat-top tower crane, especially on the top of the tower crane, and the two sets of cranes are combined and capable of independently operating flexibly, the luffing tower crane is small in size and high in flexibility, and can effectively make up for the defects of the flat-top tower crane, such as insufficient operation space caused by interference with surrounding buildings, and the luffing tower crane is capable of operating flexibly and lifting a larger weight as an independent crane, and is especially suitable for dismounting and mounting the components of the tower crane and surrounding components and the maintenance of the tower crane.

Description

Technical Field

[0001] This invention belongs to the field of construction machinery, specifically relating to an ultra-large tower crane. Background Technology

[0002] Tower cranes are widely used in various construction projects to lift various building components from the ground to the top of buildings under construction, which can greatly improve work efficiency. However, as the height of buildings continues to increase, and in more challenging environments such as mountain construction, standard-sized tower cranes are becoming increasingly unsuitable. Consequently, the requirements for the specifications and operating height of tower cranes are constantly increasing, and ultra-large tower cranes are urgently needed. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies of the prior art, the present invention provides an ultra-large tower crane to adapt to the more demanding construction engineering environment, and is flexible and convenient to disassemble and maintain.

[0004] To achieve the above objectives, the present invention provides an ultra-large tower crane, which includes a flat-top tower crane with a horizontal jib and a luffing tower crane mounted on top of the flat-top tower crane. The luffing tower crane includes a luffing jib capable of pitching and luffing, and the luffing jib and the horizontal jib are capable of rotating horizontally independently of each other.

[0005] In some embodiments, the flat-top tower crane includes a tower crane slewing assembly and a tower head extending upward from the tower crane slewing assembly;

[0006] Furthermore, the luffing tower crane includes:

[0007] The machine base is mounted on the tower head and is equipped with a boom slewing mechanism;

[0008] The boom is pivotally mounted on the machine base and can rotate horizontally following the boom slewing mechanism; and

[0009] The pitch mechanism is used to drive the boom to pitch.

[0010] In some embodiments, the flat-top tower crane includes a tower body, which comprises a plurality of standard tower body sections stacked sequentially along the height direction, and the tower crane slewing assembly is mounted on the top of the standard tower body section.

[0011] In some embodiments, the flat-top tower crane includes a plurality of attachment frames arranged at intervals along the height direction of the tower body for securing the tower body to a building. The attachment frames include attachment frames that surround the periphery of a standard section of the tower body and struts extending outward from the attachment frames.

[0012] Optionally, the horizontal extension length of the strut is less than the horizontal extension length of the horizontal lifting boom.

[0013] Optionally, the attachment frame and the support rod are connected by an attachment frame pin, and a pin sensor for detecting shear force is installed on the attachment frame pin.

[0014] In some embodiments, the boom is a telescopic boom.

[0015] In one embodiment, the luffing tower crane is a mast crane.

[0016] In some embodiments, the horizontal boom of the flat-top tower crane and the boom of the luffing tower crane are both capable of 360° horizontal rotation.

[0017] In some embodiments, the flat-top tower crane includes a counterweight boom, both of which are mounted on the tower head and driven by the tower crane slewing assembly to rotate horizontally.

[0018] In some embodiments, the flat-top tower crane includes a tower crane luffing system, the tower crane luffing system comprising:

[0019] The luffing rope winding mechanism includes a luffing drum fixedly mounted on the counterweight boom and a tower crane luffing rope wound on the luffing drum; and

[0020] The double luffing trolley includes a first connecting plate, a second connecting plate, and a first luffing trolley and a second luffing trolley capable of traveling along the horizontal boom. The two ends of the first connecting plate are detachably connected between the first side of the first luffing trolley and the first side of the second luffing trolley, respectively. The two ends of the second connecting plate are detachably connected between the second side of the first luffing trolley and the second side of the second luffing trolley, respectively.

[0021] One end of the tower crane luffing rope extends from the base of the horizontal boom toward the second luffing trolley and is connected to the second connecting plate. The other end of the tower crane luffing rope extends around the tip of the horizontal boom toward the first luffing trolley and is connected to the first connecting plate, so that the first luffing trolley and the second luffing trolley can luff synchronously or independently.

[0022] In some embodiments, the respective rope winding systems of the luffing tower crane and the flat-top tower crane are independent of each other.

[0023] In some embodiments, the top of the flat-top tower crane is provided with a transformer and a high-voltage cable storage device, and the bottom is provided with a high-voltage control device. The high-voltage control device is connected to the transformer via a high-voltage cable, and the high-voltage cable is wound on the high-voltage cable storage device.

[0024] In some embodiments, the rated lifting moment of the flat-top tower crane is not less than 10,000 ton-meters and the maximum lifting height is not less than 370 meters.

[0025] In some embodiments, the maximum lifting capacity of the luffing tower crane is not less than 30 tons.

[0026] In the ultra-large tower crane according to the present invention, the traditional derrick structure design is abandoned. Based on the flat-top tower crane, a luffing jib tower crane is specially added to the top of the tower crane to form a dual-machine combination. Each machine can flexibly and independently operate. The small size and flexibility of the luffing jib tower crane make up for the shortcomings of the flat-top tower crane, such as easy interference with surrounding buildings and insufficient working space. Moreover, as an independent crane, the luffing jib tower crane can significantly increase the lifting weight compared with the derrick mechanism, which is particularly advantageous in the disassembly and assembly process of the tower crane's own components and surrounding components, as well as in its own maintenance process.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a front view of an ultra-large tower crane according to a specific embodiment of the present invention;

[0030] Figure 2 for Figure 1 A partially enlarged view of the upper part of the super-large tower crane shown;

[0031] Figure 3 for Figure 1 The diagram shows the structure of the ultra-large tower crane during the assembly and disassembly of its attachment frame.

[0032] Figure 4a This is a schematic diagram of the attachment frame structure;

[0033] Figure 4b for Figure 4a The attachment frame shown is a cross-sectional view (AA section).

[0034] Figure 5This is a structural schematic diagram of a standard section of the tower.

[0035] Figure 6 This is a schematic diagram of the structure of a horizontal crane boom;

[0036] Figure 7 This is a schematic diagram of the counterweight arm.

[0037] Figure 8 This is a structural schematic diagram of the luffing system of an ultra-large tower crane.

[0038] Figure 9a , Figure 9b These are the front and top views of the double luffing unit of the tower crane luffing system, respectively.

[0039] Figure 10a for Figure 1 A schematic diagram of the high-voltage power supply system of the ultra-large tower crane shown.

[0040] Figure 10b This is a schematic diagram of a high-voltage cable storage device installed inside the tower.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100 flat-top tower crane 200 luffing jib tower crane

[0043] 1. Horizontal lifting boom 2. Counterbalance boom

[0044] 3 tower bodies and 4 tower heads

[0045] 5 tower crane slewing assembly 6 machine base

[0046] 7. Boom slewing mechanism 8. Boom

[0047] 9 masts, 10 winches

[0048] 11 Luffing rope 12 Luffing rope

[0049] 13 Luffing drum 14 Tower crane luffing rope

[0050] 15 First variable displacement trolley 16 Second variable displacement trolley

[0051] 17 First connecting plate 18 Second connecting plate

[0052] 19. Transformer Equipment; 20. High-Voltage Cable Storage Device

[0053] 21 High-voltage control device 22 High-voltage cable

[0054] 23. Imported mechanism; 24. Climbing frame

[0055] 25 lifting mechanism

[0056] 31 Standard tower section; 32 Attachment frame

[0057] 321 Attachment frame 322 Support rod

[0058] 323 Attachment bracket pin; 324 Pin sensor Detailed Implementation

[0059] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0060] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0061] In the embodiments of the present invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used to describe the relative positional relationships of the components in relation to the directions shown in the accompanying drawings or in relation to the vertical, perpendicular, or gravitational directions.

[0062] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0063] like Figure 1 , Figure 2 As shown, an exemplary embodiment of the present invention provides an ultra-large tower crane, including a flat-top tower crane 100 with a horizontal jib 1 and a luffing tower crane 200 mounted on top of the flat-top tower crane 100. The luffing tower crane 200 includes a luffing jib 8 capable of pitching and luffing, and the luffing jib 8 and the horizontal jib 1 are capable of rotating horizontally independently of each other.

[0064] As is well known to those skilled in the art, tower cranes of ordinary size are typically tens of meters high, and their own components or surrounding parts are relatively light, weighing at most a few tons. Their installation and dismantling can be carried out by a simple derrick mechanism installed on the top of the tower crane. However, in the design of ultra-large tower cranes, the size and specifications of the tower crane are greatly increased, and the height of the tower body and the length of the horizontal boom are significantly extended, making it easier to interfere with surrounding buildings. Moreover, the weight and volume of various structural components such as the standard sections of the tower body are greatly increased, making it difficult for ordinary derrick mechanisms to adapt in terms of lifting weight and flexibility.

[0065] Comparatively, the design of ultra-large tower cranes significantly increases in height and lifting capacity compared to conventional tower cranes. For example, the rated lifting moment of the flat-top tower crane 100 shown in this embodiment is not less than 10,000 ton-meters, and the maximum lifting height is not less than 370 meters. Therefore, in this invention, a simple derrick mechanism is not used on the counterweight boom 2 of the flat-top tower crane 100 for lifting small objects, nor is a hammer-type tower crane used. Instead, a flat-top tower crane 100 capable of carrying a luffing jib tower crane 200 is used. Based on this flat-top tower crane, an independent luffing jib tower crane 200 is added to the top of the tower crane. In this way, in the combined dual-machine structure, each has a clear division of labor. The flat-top tower crane 100 can rotate over a wide range and lift large tonnages during construction. The luffing jib tower crane 200, utilizing the flexibility and maneuverability of its boom 8, can compensate for the shortcomings of the horizontal boom 1 and plays an indispensable role in the installation and dismantling of small components, the installation and dismantling of attached rods, and the maintenance of the main crane. As an independent crane, in this embodiment, the maximum lifting capacity of the luffing tower crane 200 is not less than 30 tons, which greatly exceeds the lifting capacity of ordinary derrick mechanisms. Moreover, the luffing boom 8 is more flexible and maneuverable through pitching, horizontal rotation, etc.

[0066] To achieve a dual-machine combination with independent operation, this embodiment specifically mounts the luffing jib tower crane 200 directly above the tower body 3. For example... Figure 1 , Figure 2 As shown, 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 counterweight boom 2 and the horizontal lifting boom 1 are both mounted on the tower head 4 and driven by the tower crane slewing assembly 5 to achieve horizontal slewing.

[0067] Accordingly, the luffing jib tower crane 200 includes:

[0068] The machine base 6 is installed on the tower head 4 and is equipped with a boom slewing mechanism 7;

[0069] Boom 8, which is pivotally mounted on the machine base 6 and can rotate horizontally with the boom slewing mechanism 7; and

[0070] The pitch mechanism is used to drive the boom 8 to pitch.

[0071] Therefore, because the slewing mechanism 7 and the tower crane slewing assembly 5 are coaxially arranged, the overall structure is more stable and the force is more balanced and reliable. The slewing boom 8 and the horizontal boom 1 can pivot concentrically, making it easier to operate the slewing boom 8 of the tower crane together for auxiliary lifting operations. In this embodiment, both the horizontal boom 1 of the flat-top tower crane 100 and the slewing boom 8 of the tower crane 200 can rotate 360° horizontally.

[0072] exist Figure 1 , Figure 2In this embodiment, the luffing tower crane 200 is a mast crane, but it is not limited to this. The luffing mechanism may include a mast 9, a winch mechanism 10, and a luffing rope 11. The luffing rope 11 wound on the winch mechanism 10 extends past a fixed pulley on the mast 9 to the end of the boom 8, pulling the boom 8 to pivot vertically around its jib root, i.e., performing luffing, to adjust the horizontal distance between the end of the boom and the jib root. After reaching the set luffing angle position, the winch mechanism 10 can drive the luffing rope 12 to pull the hook hanging from the end of the boom 8 for auxiliary lifting operations.

[0073] Among them, the luffing tower crane 200 and the flat-top tower crane 100 have independent rope winding systems, that is, their luffing rope winding system and lifting rope winding system do not interfere with each other, which facilitates independent and flexible control.

[0074] Furthermore, unlike some tower cranes that place their slewing assembly at the bottom of the tower body, thus allowing the tower body and horizontal jib to rotate as a single unit, in this embodiment, the slewing assembly 5 is located at the top of the tower body 3. This allows the horizontal jib 1 to perform lifting operations more flexibly and conveniently, and also reduces the driving force for horizontal pivoting. The tower body 3 comprises multiple standard tower body sections 31 stacked sequentially along its height. The structure of each standard tower body section 31 is as follows... Figure 5 As shown, the tower crane slewing assembly 5 can be installed on the standard tower section 31 at the top of the tower body.

[0075] Because the rated lifting capacity of the flat-top tower crane 100 is extremely large and the tower height can reach hundreds of meters, the structural dimensions of the standard tower section 31 that constitutes the tower body 3 are also large, and the individual weight is also large. For example, the length, width, and height of a single standard tower section 31 are all no less than 6 meters, and the weight of a single unit reaches several tons. Similarly, the boom sections that constitute the horizontal lifting boom 1 or the counterweight boom 2 are also similar. See also Figures 5 to 7 The columns and web members that make up the standard section 31 of the tower body all adopt a detachable installation structure for easy assembly, disassembly, and transportation. The boom sections of the horizontal lifting boom 1 or counterweight boom 2 also adopt a split-hinged assembly method. See [link / reference] Figure 1 The standard tower section 31 can be continuously lifted and added sections through the lifting mechanism 25 inside the climbing frame 24, allowing the standard tower sections 31 to be stacked and climbed step by step until the required tower height is reached. Other components can also be lifted using the introduction mechanism 23.

[0076] As mentioned earlier, ultra-large tower cranes can reach heights of hundreds of meters. Therefore, in addition to the larger size and higher structural strength of the standard tower section 31, multiple attachment frames 32 are typically arranged at intervals along the height of the tower 3 to secure it to adjacent buildings under construction. Figure 3 As shown. See also Figure 3 , Figure 4aThe attachment frame 32 generally includes an attachment frame 321 that surrounds the standard section 31 of the tower body and a strut 322 that extends outward from the attachment frame 321. The end of the strut 322 is connected to the building.

[0077] See Figure 4b The attachment frame 321 and the support rod 322 are connected by an attachment frame pin 323, and a pin sensor 324 for detecting shear force can also be installed on the attachment frame pin 323. In this way, the stability of the tower crane can be monitored under severe conditions such as strong winds and earthquakes, improving the safety and reliability of the entire machine's operation, which is especially important for ultra-large tower cranes with large lifting capacity and extremely high height.

[0078] like Figure 3 As shown, since the building is relatively close to the tower body 3, the horizontal distance between them is the horizontal extension length of the strut 322, which is generally smaller than the horizontal extension length of the horizontal jib 1. Thus, a building of a certain height will obstruct the full rotation of the horizontal jib 1. The completed building will interfere with the horizontal rotation of the horizontal jib 1, making it difficult for the horizontal jib 1 to rotate to a position close to the building and directly above the strut 322 of the attachment frame 32, thus hindering its convenient use for lifting the attachment frame 32, etc., during self-disassembly of the tower crane. At this time, the luffing tower crane 200 can drive the luffing jib 8, which is higher than the horizontal jib 1, to rotate flexibly and avoid mechanical interference with the building. During operation, the luffing mechanism can drive the luffing jib 8 to a set luffing angle position, driving the luffing jib 8 to rotate directly above the strut 322 of the attachment frame 32, until the hook at the end of the luffing jib 8 can lift the strut 322, etc., assisting in the disassembly and assembly of the tower crane's peripheral components.

[0079] In an optional embodiment, the boom 8 can also be a telescopic boom, for example, the connected boom sections form a sliding nest, so that the boom can be extended or retracted under the action of the hydraulic cylinder, thereby realizing luffing.

[0080] Ultra-large tower cranes have large lifting capacities and can lift more objects at once. To achieve more flexible translation and luffing control, this embodiment of the tower crane luffing system also employs a dual luffing carriage. Combined with... Figure 1 , Figure 8 As shown, the luffing system of the flat-top tower crane 100 includes a luffing rope winding mechanism, which includes a luffing drum 13 fixedly mounted on the counterweight boom 2 and a tower crane luffing rope 14 wound on the luffing drum 13. The double luffing unit travels horizontally along the horizontal boom 1, as shown... Figure 8 , Figure 9a , Figure 9bAs shown, the double luffing trolley includes a first connecting plate 17, a second connecting plate 18, and a first luffing trolley 15 and a second luffing trolley 16 that can travel along the horizontal boom 1. The two ends of the first connecting plate 17 are detachably connected between the first side of the first luffing trolley 15 and the first side of the second luffing trolley 16, respectively. The two ends of the second connecting plate 18 are detachably connected between the second side of the first luffing trolley 15 and the second side of the second luffing trolley 16, respectively. One end of the tower crane luffing rope 14 extends from the root of the horizontal boom 1 toward the second luffing trolley 16 and is connected to the second connecting plate 18. The other end of the tower crane luffing rope 14 passes around the tip of the horizontal boom 1 and extends toward the first luffing trolley 15 and is connected to the first connecting plate 17.

[0081] Specifically, by pulling the luffing rope 14 with the luffing drum 13, the first luffing trolley 15 and the second luffing trolley 16 can be synchronously luffed; 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 pulling the luffing rope 14 can achieve independent luffing of the other of the first luffing trolley 15 and the second luffing trolley 16, thereby achieving synchronous luffing of the other of the two trolleys. Figure 8 The luffing rope mechanism shown can simultaneously achieve synchronous luffing and independent luffing of the first luffing trolley 15 and the second luffing trolley 16, making the tower crane's hoisting and movement more flexible and versatile.

[0082] See Figure 10a , Figure 10b In this embodiment, the top of the flat-top tower crane 100 is also provided with a transformer 19 and a high-voltage cable storage device 20, and the bottom is provided with a high-voltage control device 21. The high-voltage control device 21 is connected to the transformer 19 through a high-voltage cable 22, and the high-voltage cable 22 is wound on the high-voltage cable storage device 20.

[0083] In conventional tower cranes, the power supply solution involves placing a prefabricated substation on the ground to convert high-voltage electricity into low-voltage electricity before supplying power to the tower crane. However, for ultra-large tower cranes with greater height and power, this solution results in significant voltage drop in the cables, requiring larger cable cross-sectional areas or more cables, increasing costs and line losses over longer cable usage, and also increasing the difficulty of on-site wiring and jacking operations. Furthermore, ultra-large tower cranes have substantial load-bearing capacity, necessitating the installation of high-power motors or control equipment at the top of the crane to meet these requirements. If a standard tower crane power supply solution is used—installing a low-voltage power source (e.g., 380V) on the ground and using ordinary cables to supply power to the equipment at the top of the large tower crane—for example, if the equipment requires 1600A, the number of ordinary cables needed would range from 10 to 20. Given the height of ultra-large tower cranes, this number of cables leads to difficult and complex on-site wiring, high costs, and a significant increase in the workload for workers.

[0084] In this embodiment, by installing a high-voltage control device 21 on the ground and a transformer 19 on the upper part of the super-large tower crane, and electrically connecting the high-voltage control device 21 and the transformer 19 with high-voltage cables 22, the power supply system for the super-large tower crane can transmit high-voltage electricity from the ground to the upper part of the super-large tower crane using only a small number of high-voltage cables 22. The transformer 19 then converts the high-voltage electricity into low-voltage electricity to meet the power demand of the upper electrical equipment of the super-large tower crane, ensuring the operational stability of the power supply system, significantly reducing the difficulty of cable laying, alleviating the workload of the workers, and improving the laying efficiency.

[0085] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0086] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0087] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A super-large tower crane, characterized in that, The super-large tower crane includes a flat-top tower crane (100) with a horizontal jib (1) and a luffing tower crane (200) mounted on top of the flat-top tower crane (100). The luffing tower crane (200) includes a luffing jib (8) capable of pitching and luffing. The luffing jib (8) and the horizontal jib (1) are capable of rotating horizontally independently of each other. 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). The counterweight boom (2) and the horizontal lifting boom (1) are both mounted on the tower head (4) and driven by the tower crane slewing assembly (5). Furthermore, the luffing tower crane (200) includes: The machine base (6) is installed on the tower head (4) and is equipped with a boom slewing mechanism (7). The boom (8) is pivotally mounted on the machine base (6) and can rotate horizontally with the boom slewing mechanism (7); and A pitch-luffing mechanism is used to drive the boom (8) to pitch and luff. The pitch-luffing mechanism includes a mast (9), a winch mechanism (10), a boom luffing rope (11), and a boom lifting rope (12). The boom luffing rope (11) wound on the winch mechanism (10) extends past the fixed pulley on the mast (9) to the end of the boom (8) to pull the boom (8) to pitch and luff to a set luffing angle position. After the boom (8) reaches the set luffing angle position, the winch mechanism (10) can drive the boom lifting rope (12) to pull the hook hanging from the end of the boom (8). The flat-top tower crane (100) is equipped with a transformer (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 transformer (19) through a high-voltage cable (22), and the high-voltage cable (22) is wound on the high-voltage cable storage device (20).

2. The ultra-large tower crane according to claim 1, characterized in that, The flat-top tower crane includes a tower body (3), which includes multiple standard tower sections (31) stacked sequentially along the height direction. The tower crane slewing assembly (5) is installed on the top standard tower section (31).

3. The ultra-large tower crane according to claim 2, characterized in that, The flat-top tower crane (100) includes a plurality of attachment frames (32) arranged at intervals along the height direction of the tower body (3) for fixing the tower body (3) to the building. The attachment frames (32) include attachment frames (321) that surround the standard section (31) of the tower body and support rods (322) extending outward from the attachment frames (321).

4. The ultra-large tower crane according to claim 3, characterized in that, The horizontal extension length of the strut (322) is less than the horizontal extension length of the horizontal lifting arm (1).

5. The ultra-large tower crane according to claim 3, characterized in that, The attachment frame (321) and the support rod (322) are connected by an attachment frame pin (323), and a pin sensor (324) for detecting shear force is installed on the attachment frame pin (323).

6. The ultra-large tower crane according to claim 1, characterized in that, The horizontal boom (1) of the flat-top tower crane (100) and the boom (8) of the luffing tower crane (200) are both capable of 360° horizontal rotation.

7. The ultra-large tower crane according to claim 1, characterized in that, The flat-top tower crane (100) includes a counterweight boom (2), both of which are mounted on the tower head (4) and driven by the tower crane slewing assembly (5) to slew horizontally.

8. The ultra-large tower crane according to claim 7, characterized in that, The flat-top tower crane (100) includes a tower crane luffing system, which includes: The luffing rope winding mechanism includes a luffing drum (13) fixedly mounted on the counterweight boom (2) and a tower crane luffing rope (14) wound on the luffing drum (13); and The double luffing trolley includes a first connecting plate (17), a second connecting plate (18), and a first luffing trolley (15) and a second luffing trolley (16) capable of traveling along the horizontal boom (1). The two ends of the first connecting plate (17) are detachably connected between the first side of the first luffing trolley (15) and the first side of the second luffing trolley (16), respectively. The two ends of the second connecting plate (18) are detachably connected between the second side of the first luffing trolley (15) and the second side of the second luffing trolley (16), respectively. One end of the tower crane luffing rope (14) extends from the root of the horizontal boom (1) toward the second luffing trolley (16) and is connected to the second connecting plate (18). The other end of the tower crane luffing rope (14) extends around the tip of the horizontal boom (1) toward the first luffing trolley (15) and is connected to the first connecting plate (17), so that the first luffing trolley (15) and the second luffing trolley (16) can luff synchronously or independently.

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