Tower crane and method of crane construction

Abstract

The application discloses a tower crane and a crane construction method, and relates to the technical field of cranes.The tower crane comprises a tower body assembly;the slewing mechanism comprises an upper slewing support and a lower slewing support which is in slewing connection with the upper slewing support, the lower slewing support is provided with a placing platform for placing standard sections, the lower slewing support is sleeved outside the tower body assembly and can climb or descend relative to the tower body assembly;the crane boom assembly is assembled at the top of the upper slewing support, the crane boom assembly comprises a horizontal crane boom, an amplitude-changing trolley and a hoisting device which is installed on the horizontal crane boom, and the hoisting device is used for leading the standard sections on the placing platform into the lower slewing support.The application can lead or exit multiple standard sections at the upper end of the horizontal crane boom at one time through the cooperation of the slewing mechanism and the crane boom assembly, can realize fast climbing and adding sections and fast tower descending operations, does not need to separately set a slewing part and an external climbing frame, and improves the cooperation stability and practicality of the slewing mechanism and the crane boom assembly.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering machinery, and particularly relates to a tower crane and a crane construction method. BACKGROUND

[0002] When the conventional tower crane is climbing and adding sections, the rotating mechanism is supported at the end of the tower body, so that the whole upper part of the conventional tower crane is supported on the rotating mechanism with a notch on one side. From the mechanical model, the safety of the tower crane is supported by a double cantilever beam structure. No matter how the design is optimized, the rotating mechanism cannot effectively support the tower body, and it is difficult to greatly improve the safety of the climbing operation, so that the tower crane has poor stability and low practicability. Moreover, when the conventional tower crane is hoisting in the typhoon season and the wind season, the construction environment is poor and the wind load is variable, so the tower crane generally needs to realize rapid climbing and rapid descending. The conventional tower crane cannot smoothly realize the rapid climbing and rapid descending, has poor operation convenience, has high overall cost, and has low practicability. SUMMARY

[0003] The main purpose of the present application is to provide a tower crane and a crane construction method, which aims to solve the technical problem of poor practicability and stability of the tower crane in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present application provides a tower crane, wherein the tower crane comprises: a tower body assembly; a rotating mechanism comprising an upper rotating support and a lower rotating support rotatably connected with the upper rotating support, the lower rotating support being provided with a placing platform for placing a standard section, the lower rotating support being sleeved outside the tower body assembly and being capable of climbing or descending relative to the tower body assembly; a hoisting arm assembly assembled at the top of the upper rotating support, the hoisting arm assembly comprising a horizontal hoisting arm, an amplitude-changing trolley and a hoisting device mounted on the horizontal hoisting arm, the amplitude-changing trolley being connected with the horizontal hoisting arm through a hoisting mechanism, and the hoisting device being used for introducing the standard section on the placing platform into the lower rotating support.

[0005] In the embodiment of the present application, the top end of the tower body assembly is provided with a transition section capable of extending into the lower rotating support, and the tower body assembly is detachably connected with the lower rotating support through the transition section.

[0006] In the embodiment of the present application, the lower rotating support is provided with a cross-shaped arc-shaped main rib plate, and the transition section is connected with the lower rotating support through the main rib plate.

[0007] In the embodiment of the present application, the top of the horizontal hoisting arm is provided with an opening for the standard section to pass through, and the edge of the opening is provided with a vertically extending guide rail for guiding cooperation with the standard section.

[0008] In the embodiment of the present application, the guide rail is internally provided with guide blocks for sliding contact with the standard segments, and a plurality of the guide blocks are arranged at intervals along the extension direction of the guide rail.

[0009] In the embodiment of the present application, the hoisting device is arranged on one side of the opening, and a turnover door for opening or closing the opening is hingedly arranged on the other side of the opening.

[0010] In the embodiment of the present application, a placing platform for placing the transition segment is arranged on the horizontal jib near the turnover door.

[0011] In the embodiment of the present application, the slewing mechanism further comprises a jacking oil cylinder and a jacking cross beam, the jacking cross beam is connected with the lower slewing support through the jacking oil cylinder, a booster oil cylinder for boosting the jacking cross beam is arranged on the lower slewing support, and the lower slewing support and the jacking cross beam are respectively provided with rotatable step-changing climbing claws and rotatable jacking climbing claws for positioning and cooperating with the standard segments.

[0012] In the embodiment of the present application, the inner side of the lower slewing support is provided with a roller assembly for guiding and cooperating with the standard segments.

[0013] The present application further provides a crane construction method, which comprises the following steps:

[0014] The upper slewing support is controlled to rotate the horizontal jib to a working position corresponding to the placing platform, the hoisting mechanism is controlled to transfer a standard segment to be introduced on the ground to the placing platform through the luffing trolley, the hoisting mechanism is controlled to hoist a new standard segment through the luffing trolley, and the luffing trolley is controlled to move to a trimming position on the horizontal jib.

[0015] The upper slewing support is controlled to rotate the horizontal jib to an avoiding position avoiding the placing platform, the lower slewing support is supported on the tower assembly, the hoisting device is controlled to introduce the standard segment on the placing platform into the lower slewing support through the opening until the lower end surface of the standard segment contacts with the upper end surface of the tower assembly, and the slewing mechanism is controlled to climb along the tower assembly after the standard segment is connected.

[0016] In the embodiment of the present application, the rotatable step-changing climbing claws and the rotatable jacking climbing claws are supported on the steps of a standard segment, and the transition segment in the lower slewing support is removed.

[0017] In the embodiment of the present application, the control of the hoisting device to introduce the standard segment on the placing platform into the lower slewing support through the opening further comprises the following steps:

[0018] The removed transition segment is placed on the placing platform through the hoisting device.

[0019] The flip door is rotated to open the opening, the standard section is lifted to the position just above the flip door by the hoist, and the horizontal lifting arm is rotated to the working position.

[0020] Through the above technical solution, the tower crane provided by the embodiment of the present invention has the following beneficial effects:

[0021] When the tower crane of the present invention is used for climbing and adding sections, the horizontal boom can be rotated to the working position by the cooperation of the upper slewing support and the lower slewing support, the standard section to be introduced on the ground can be placed on the luffing trolley, and then the luffing trolley is lifted by the lifting mechanism. The luffing trolley then moves along the horizontal boom to the position corresponding to the placement platform and transfers the standard section to the placement platform to facilitate the lifting of the hoist. The lower slewing support is supported on the tower body assembly, and the hoist lifts the standard section and introduces the standard section into the lower slewing support, so that the standard section to be introduced is connected to the tower body assembly. The upper slewing support can climb to a specified height relative to the tower body assembly. When the tower crane is used for tower lowering construction, the lower slewing support can be supported on the tower body assembly, the standard section at the top of the tower body assembly is withdrawn and transferred to the placement platform by the hoist. The lower slewing support is lowered to a specified height relative to the tower body assembly, and the withdrawn standard section is transported to the ground by the cooperation of the luffing trolley and the lifting mechanism. The tower crane in the present invention can introduce or withdraw multiple standard sections at the upper end of the horizontal boom at one time through the cooperation of the slewing mechanism and the boom assembly, which can realize both rapid climbing and section adding operations and rapid tower lowering operations. In addition, the lower slewing support and the tower body assembly are used to cooperate in climbing and supporting, and there is no need to separately set up a slewing part and an external climbing frame, which improves the coordination stability and practicality of the slewing mechanism and the boom assembly.

[0022] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide an understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 is a structural schematic diagram of a tower crane according to one embodiment of the present invention;

[0025] Figure 2 is a partial structural diagram of a tower crane according to one embodiment of the present invention;

[0026] Figure 3 2 is a schematic structural diagram of a boom assembly of a tower crane according to an embodiment of the present invention;

[0027] Figure 42 is a schematic structural diagram of a slewing mechanism of a tower crane according to an embodiment of the present invention;

[0028] Figure 5 yes Figure 4 A magnified schematic diagram of area A in the middle;

[0029] Figure 6 2. It is a schematic diagram of the assembly structure of the slewing mechanism and tower body assembly of a tower crane according to one embodiment of the present invention;

[0030] Figure 7 2. It is a schematic structural diagram of a transition section of a tower crane according to one embodiment of the present invention;

[0031] Figure 8 2 is a flow chart of a crane construction method according to an embodiment of the present invention.

[0032] Description of Reference Numerals

[0033]

[0034] DETAILED DESCRIPTION

[0035] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0036] A tower crane according to the present invention will be described below with reference to the accompanying drawings.

[0037] like Figures 1 to 6 As shown, in an embodiment of the present invention, a tower crane 100 is provided, wherein the tower crane 100 includes a tower body assembly 1, a slewing mechanism 2 and a boom assembly 3; the slewing mechanism 2 includes an upper slewing support 21 and a lower slewing support 22 rotatably connected to the upper slewing support 21, the lower slewing support 22 is provided with a placement platform 221 for placing a standard section 11, the lower slewing support 22 is mounted outside the tower body assembly 1 and can climb or descend relative to the tower body assembly 1; the boom assembly 3 is assembled on the top of the upper slewing support 21, the boom assembly 3 includes a horizontal boom 31, a luffing trolley 34 and a hoist 32 installed on the horizontal boom 31, the luffing trolley 34 is connected to the horizontal boom 31 through a lifting mechanism, and the hoist 32 is used to introduce the standard section 11 on the placement platform 221 into the lower slewing support 22.

[0038] It can be understood that the lower end of the luffing trolley 34 is connected with a lifting hook 33 through a steel wire rope, and the standard section 11 can be hooked through the lifting hook 33, so as to facilitate the lifting of the standard section 11. The tower body assembly 1, the slewing mechanism 2 and the lifting arm assembly 3 in the embodiment can be controlled through an electric control system, a programmable controller or a manual remote controller in the prior art. In the embodiment, the lifting arm assembly 3 is connected to the top of the slewing mechanism 2, the slewing mechanism 2 is sleeved on the tower body assembly 1, the hoisting mechanism can adopt a steel wire rope hoisting member in the prior art, the hoisting device 32 can adopt a pole crane with a lifting hook, and the hoisting device 32 can rotate relative to the horizontal lifting arm 31. The upper end of the lower slewing support 22 is rotationally connected with the upper slewing support 21, and the lower end can be supported on the tower body assembly 1 and can climb or descend along the tower body assembly 1, so as to integrate the slewing and connection in one, and improve the cooperation stability of the tower body assembly 1, the slewing mechanism 2 and the lifting arm assembly 3, thereby avoiding the situation that accidents are caused due to unstable assembly. Figure 4 As shown in FIG. 8, the placing platform 221 in the embodiment is hinged to the lower slewing support 22 through a hinge frame, and the placing platform 221 can rotate relative to the lower slewing support 22 between a horizontal position and a vertical position, so as to realize folding and unfolding, and can hold the standard section 11 in the horizontal position and avoid other components in the vertical position.

[0039] When the tower crane 100 in the embodiment is used for climbing and section adding construction, the horizontal lifting arm 31 can be rotated to a working position through cooperation of the upper slewing support 21 and the lower slewing support 22, the standard section 11 to be introduced on the ground is held by the luffing trolley 34, then the luffing trolley 34 is lifted by the hoisting mechanism, and then the luffing trolley 34 moves along the horizontal lifting arm 31 to a position corresponding to the placing platform 221 and transfers the standard section 11 to the placing platform 221, so as to facilitate the lifting of the hoisting device 32, the lower slewing support 22 is supported on the tower body assembly 1, the hoisting device 32 lifts the standard section 11 and introduces the standard section 11 into the lower slewing support 22, the standard section 11 to be introduced is connected with the tower body assembly 1, and the upper slewing support 21 can climb to a specified height relative to the tower body assembly 1. When the tower crane 100 is used for tower lowering construction, the lower slewing support 22 can be supported on the tower body assembly 1, the standard section 11 on the top of the tower body assembly 1 is withdrawn, and the withdrawn standard section 11 is transferred to the placing platform 221 by the hoisting device 32, the lower slewing support 22 is lowered to a specified height relative to the tower body assembly 1, and the withdrawn standard section 11 is transported to the ground by cooperation of the luffing trolley 34 and the hoisting mechanism.

[0040] The tower crane 100 in the embodiment can introduce or withdraw multiple standard sections 11 at the upper end of the horizontal jib 31 at one time through cooperation of the slewing mechanism 2 and the jib assembly 3, completely relies on the structure itself, and does not need external auxiliary tools, and can realize rapid climbing and adding sections and rapid tower lowering operations, and adopts cooperation of the lower slewing support 22 and the tower body assembly 1 for climbing and supporting, and cooperation of the slewing mechanism 2 arranged on the top, without separately arranging a slewing part and an external climbing frame, and the cooperation stability and practicability of the slewing mechanism 2 and the jib assembly 3 are improved.

[0041] In the embodiment, the top end of the tower body assembly 1 is provided with a transition section 12 capable of extending into the lower slewing support 22, and the tower body assembly 1 is detachably connected with the lower slewing support 22 through the transition section 12 and the lower slewing support 22. Figure 6 and Figure 7 As shown in the figures, the lower slewing support 22 is hollow, and the sizes of the transition section 12 and the standard section 11 are smaller than the hollow size of the lower slewing support 22, and the tower body assembly 1 and the lower slewing support 22 can be connected by connecting the inside of the lower slewing support 22 through the transition section 12. In the embodiment, the connection mode that the transition section 12 is accommodated in the lower slewing support 22 makes the structure more compact, and the mechanical properties are more excellent, and the structural strength and stability are improved.

[0042] In an embodiment, the transition section 12 includes a frame-shaped outer frame 121 and a reinforcing inclined rod 122 connected with the side of the outer frame, the size of the transition section 12 is smaller than the size of the standard section 11, and the structure is relatively simple, and the assembly, disassembly and hoisting between the transition section 12 and the lower slewing support 22 are facilitated, and the convenience of climbing and tower lowering construction of the tower crane 100 is improved.

[0043] Specifically, the lower slewing support 22 is provided with a cross-shaped arc-shaped main reinforcement plate 224 inside, and the transition section 12 is detachably connected with the lower slewing support 22 through the main reinforcement plate 224. Figure 6 As shown in the figures, the inside of the lower slewing support 22 in the embodiment is provided with multiple arc-shaped main reinforcement plates 224, and the arc-shaped main reinforcement plates 224 are cross-shaped, and the connection strength between the transition section 12 and the lower slewing support 22 is strengthened. In an embodiment, the transition section 12 and the main reinforcement plate 224 can be connected through a pin shaft connection mode, and in another embodiment, the transition section 12 and the main reinforcement plate 224 can be connected through a screw connection mode, and the specific connection mode is not limited in the present application, and the transition section 12 and the main reinforcement plate 224 can be detachably connected according to actual use requirements.

[0044] In an embodiment, the top of the horizontal jib 31 is provided with an opening 311 through which the standard section 11 passes, and the edge of the opening 311 is provided with a vertically extending guide rail 313 for guiding cooperation with the standard section 11. In another embodiment, the opening 311 can be provided on the side of the horizontal jib 31, and the standard section 11 is introduced from the top or side of the horizontal jib 31. The hollow introduction surface of the lower rotary support 22 can be avoided, the abdominal bars can be arranged on all four sides of the lower rotary support 22, the overall rigidity is ensured, the structural strength of the lower rotary support 22 is improved, and the safety of the tower crane 100 is significantly improved. When the standard section 11 is introduced during construction, the standard section 11 is aligned with the opening 311, the guide rail 313 and the standard section 11 can be guided and cooperated, the introduction of the standard section 11 is more smooth and stable, and when the tower is lowered, the withdrawn standard section 11 can also be guided and cooperated with the guide rail 313. In addition, when the lower rotary support 22 climbs or descends along the tower body assembly 1, the lower rotary support 22 drives the horizontal jib 31 to climb or descend along the tower body assembly 1, the guide rail 313 of the horizontal jib 31 can guide and cooperate with the standard section 11 of the tower body assembly 1, and the horizontal jib 31 supports the standard section 11 of the tower body assembly 1, thereby improving the safety of the climbing and lowering operations.

[0045] In the embodiment of the present application, the guide rail 313 is provided with a guide sliding block 314 for sliding contact cooperation with the standard section 11, and a plurality of guide sliding blocks 314 are arranged at intervals along the extension direction of the guide rail 313. In this embodiment, the support and guidance of the standard section 11 are achieved by cooperating the vertically arranged plurality of guide sliding blocks 314 with the standard section 11, which is simple in structure and easy to install.

[0046] Specifically, the hoisting device 32 is arranged on one side of the opening 311, and the other side of the opening 311 is hinged with a turnover door 312 for opening or closing the opening 311. When the tower crane 100 needs to perform climbing or tower lowering operation, the turnover door 312 is rotated to open the opening 311, so that the standard section 11 can pass through the horizontal jib 31. When no climbing or tower lowering operation is needed, the turnover door 312 is rotated to close the opening 311. The turnover door 312 is connected to the main structure of the horizontal jib 31, which can improve the structural strength of the horizontal jib 31. The hoisting device 32 and the turnover door 312 are arranged opposite to each other, which can avoid interference between components, and also facilitate the construction operation of introducing or withdrawing the standard section 11 by the hoisting device 32.

[0047] In the embodiment of the present application, a placement platform 315 for placing the transition section 12 is arranged on the horizontal jib 31 near the turnover door 312. As shown in FIG. 4, the placement platform 315 is arranged on the horizontal jib 31 near the turnover door 312, and the transition section 12 is placed on the placement platform 315. When the standard section 11 is introduced, the transition section 12 is placed on the placement platform 315, and the standard section 11 is introduced through the transition section 12. When the standard section 11 is withdrawn, the transition section 12 is placed on the placement platform 315, and the standard section 11 is withdrawn through the transition section 12. The placement platform 315 is arranged on the horizontal jib 31 near the turnover door 312, which can avoid interference between the hoisting device 32 and the turnover door 312, and also facilitates the construction operation of introducing or withdrawing the standard section 11 by the hoisting device 32. Figure 3As shown, the storage platform 315 in the embodiment is a net structure and is arranged on the main structure of the horizontal lifting arm 31, which can temporarily place the transition joint 12 and the standard joint 11, facilitate the operation of other components, optimize the operation process, and improve the practicability of the tower crane 100.

[0048] In an embodiment, the slewing mechanism 2 further comprises a jacking oil cylinder 23 and a jacking cross beam 24, the jacking cross beam 24 is connected with the lower slewing support 22 through the jacking oil cylinder 23, the lower slewing support 22 is provided with a booster oil cylinder 222 for boosting the jacking cross beam 24, and the lower slewing support 22 and the jacking cross beam 24 are respectively provided with a rotatable step-changing climbing claw 223 and a rotatable jacking claw for positioning with the standard joint 11. The standard joint 11 in the embodiment is provided with steps capable of positioning with the step-changing climbing claw 223 and the jacking claw. When the slewing mechanism 2 drives the lifting arm assembly 3 to climb or descend to a specified height relative to the tower body assembly 1 through the extension and retraction of the jacking oil cylinder 23, the rotatable step-changing climbing claw 223 is positioned with the standard joint 11, the booster oil cylinder 222 boosts the jacking cross beam 24 into the lower slewing support 22, and the jacking claw is rotated to be positioned with the standard joint 11. Compared with the manual adjustment of the position of the jacking cross beam 24 in the prior art, the embodiment can realize fully automatic operation.

[0049] As shown in Figure 4 and Figure 5 In an embodiment, the inner side of the lower slewing support 22 is provided with a roller assembly 225 for guiding the standard joint 11. Specifically, the four corners of the lower slewing support 22 are each provided with a roller assembly 225, and the roller assembly 225 in the embodiment is composed of a mounting bracket and at least two rollers. The roller assembly 225 can support and guide the standard joint 11 in cooperation with the guide sliding block 314 on the horizontal lifting arm 31. Compared with the prior art, the length of the lower slewing support 22 can be shortened on the basis of the support of the horizontal lifting arm 31, the mechanical properties are improved, and the manufacturing cost is reduced.

[0050] As shown in Figure 8 The present application further provides a crane construction method, and the crane construction method comprises the following steps.

[0051] In step S10, the upper slewing support 21 is controlled to rotate the horizontal lifting arm 31 to a working position corresponding to the placing platform 221, the hoisting mechanism is controlled to transfer the standard joint 11 to be introduced on the ground to the placing platform 221 through the luffing trolley 34, the hoisting mechanism is controlled to hoist a new standard joint 11 through the luffing trolley 34, and the luffing trolley 34 is controlled to move to a trimming position on the horizontal lifting arm 31.

[0052] Step S20, control the upper slewing support 21 to rotate the horizontal jib 31 to an avoiding position to avoid the placing platform 221, support the lower slewing support 22 on the tower body assembly 1, control the hoisting device 32 to introduce the standard section 11 on the placing platform 221 into the lower slewing support 22 until the lower end surface of the standard section 11 and the upper end surface of the tower body assembly 1 are in contact, connect the standard section 11, and then control the slewing mechanism 2 to climb along the tower body assembly 1. The above control can be realized by an electric control system, a programmable controller or manual remote control in the prior art, and the luffing trolley 34 can adopt the hoisting trolley in the prior art.

[0053] In the embodiment, the horizontal jib 31 is first rotated to a working position corresponding to the placing platform 221 by cooperation of the upper slewing support 21 and the lower slewing support 22, at this time, the horizontal jib 31 is directly above the placing platform 221, then the luffing trolley 34 and the lifting mechanism on the horizontal jib 31 are used to hoist and transfer the standard section to be introduced on the ground to the placing platform 221, then the luffing trolley 34 is used to hoist the new standard section 11 to balance the horizontal jib 31, to ensure the stability and safety of construction, then the horizontal jib 31 is rotated to an avoiding position to avoid the placing platform 221, to expose the construction space above the placing platform 221 to the hoisting device 32, then the lower slewing support 22 is supported on the tower body assembly 1, the standard section 11 on the placing platform 221 is introduced into the lower slewing support 22 by the hoisting device 32, and the pin shaft assembly of the standard section 11 to be introduced and the standard section 11 on the top of the tower body assembly 1 is performed, finally the slewing mechanism 2 drives the jib assembly 3 to climb upward to a specified position. In the embodiment, the tower crane 100 is first hoisted, transferred, connected and then installed by cooperation of the horizontal jib 31, the luffing trolley 34, the lifting mechanism, the hoisting device 32 and the lower slewing support 22, the standard section 11 can be introduced at one time, and the tower can be quickly erected.

[0054] Based on the first embodiment, the second embodiment of the present application is proposed, and the supporting of the lower slewing support 22 on the tower body assembly 1 specifically includes the following steps: S21, the rotatable step-changing climbing claw 223 and the rotatable jacking climbing claw are supported on the steps of the standard section 11, and the transition section 12 in the lower slewing support 22 is removed. In the embodiment, when the jacking climbing claw is driven to support on the steps of the standard section 11, the jacking cross beam 24 can be assisted by the power-assisted oil cylinder 222, and the transition section 12 is removed, which can facilitate the introduction of the standard section 11 to be introduced and the assembly of the standard section 11 to be introduced and the standard section 11 on the top of the tower body assembly 1. After the slewing mechanism 2 is climbed into position, the removed transition section 12 can be hoisted into the lower slewing support 22 and detachably connected with the lower slewing support 22 and the standard section 11 on the top of the tower body assembly 1, to facilitate the climbing construction operation next time, and the section adding operation of the tower body assembly 1 can be completed.

[0055] Based on the second embodiment, the third embodiment of the present application is proposed, and the control of the hoist 32 includes the following steps before the standard section 11 on the placing platform 221 is introduced into the lower slewing bearing 22 through the opening 311:

[0056] In step S22, the removed transition section 12 is placed on the storage platform 315 by the hoist 32.

[0057] In step S23, the rotating turnstile door 312 opens the opening 311, the standard section 11 is hoisted to the upper side of the turnstile door 312 by the hoist 32, and the horizontal jib 31 is rotated to the working position.

[0058] In this embodiment, the transition section 12 is removed and placed on the storage platform 315 for standby, which facilitates the reassembly of the transition section 12. The opening 311 is opened by opening the turnstile door 312, which facilitates the introduction of the standard section 11. The standard section 11 is hoisted to the upper side of the turnstile door 312, and then the horizontal jib 31 is rotated to the working position, which avoids the interference between the horizontal jib 31 and the standard section, and further improves the safety of the section operation.

[0059] Based on the first embodiment, the fourth embodiment of the present application is proposed, the rotating turnstile door 312 opens the opening 311, the lifting cylinder 23 in the slewing mechanism 2 is started to make the slewing mechanism drive the jib assembly 3 to descend downward relative to the tower body assembly 1, then the lower slewing bearing 22 is supported on the tower body assembly 1, and the specific supporting operation is as follows: in step S21, the transition section 12 is removed and transferred to the storage platform 315 by the hoist 32, the standard section 11 is removed and transferred to the placing platform 221 by the hoist 32, the lifting cylinder 23 is retracted to the specified position, the transition section 12 is reinstalled, and the horizontal jib 31 is rotated, and the removed standard section 11 is transferred to the ground by the hoist 32, the luffing trolley 34 and the lifting mechanism, thereby realizing the rapid tower lowering construction.

[0060] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0061] In this application, unless otherwise clearly indicated, the terms "mounting", "connection", "connecting", "fixed", "fixedly connected" and the like should be understood in the broadest sense possible, such as it can be fixedly connected, detachably connected, or integral; it can be mechanical connection, or electrical connection, or communication with each other; it can be direct connection, or indirect connection via an intermediate medium; it can be the internal communication of two elements, or the interaction between two elements, unless otherwise clearly indicated. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0063] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A tower crane, characterized in that The tower crane (100) comprises: a tower body assembly (1); a slewing mechanism (2) comprising an upper slewing support (21) and a lower slewing support (22) connected with the upper slewing support (21) in slewing mode, the lower slewing support (22) being provided with a placing platform (221) for placing a standard section (11), the lower slewing support (22) being sleeved on the tower body assembly (1) and capable of climbing or descending relative to the tower body assembly (1); a jib assembly (3) assembled on the top of the upper slewing support (21), the jib assembly (3) comprising a horizontal jib (31), a luffing trolley (34) and a hoisting device (32) mounted on the horizontal jib (31), the luffing trolley (34) being connected with the horizontal jib (31) through a hoisting mechanism, the hoisting device (32) being used for leading the standard section (11) on the placing platform (221) into the lower slewing support (22); a transition section (12) capable of extending into the lower slewing support (22) being arranged at the top end of the tower body assembly (1), the tower body assembly (1) being detachably connected with the lower slewing support (22) through the transition section (12), the lower slewing support (22) being hollowly arranged, and the sizes of the transition section (12) and the standard section (11) being smaller than the hollow size of the lower slewing support (22), the tower body assembly (1) and the lower slewing support (22) being connected by connecting the inside of the lower slewing support (22) through the transition section (12); an opening (311) for the standard section (11) to pass through being arranged at the top of the horizontal jib (31), a vertically extending guide rail (313) being arranged at the edge of the opening (311), the guide rail (313) being used for guiding cooperation with the standard section (11).

2. A tower crane according to claim 1, characterised in that A cross-shaped arc-shaped main reinforcement plate (224) is arranged in the lower slewing support (22), and the transition section (12) is connected with the lower slewing support (22) through the main reinforcement plate (224).

3. A tower crane according to claim 1, characterised in that A guide sliding block (314) used for sliding contact cooperation with the standard section (11) is arranged in the guide rail (313), and a plurality of guide sliding blocks (314) are arranged in the extension direction of the guide rail (313) in a spaced manner.

4. The tower crane of claim 1, wherein, The hoisting device (32) is arranged on one side of the opening (311), and a turnover door (312) used for opening or closing the opening (311) is hingedly arranged on the other side of the opening (311).

5. The tower crane according to claim 4, wherein: A placing platform (315) for placing the transition section (12) is arranged on the horizontal jib (31) close to the turnover door (312).

6. A tower crane according to any one of claims 1 to 5, characterised in that The slewing mechanism (2) further comprises a jacking oil cylinder (23) and a jacking cross beam (24), the jacking cross beam (24) is connected with the lower slewing support (22) through the jacking oil cylinder (23), the lower slewing support (22) is provided with a booster oil cylinder (222) for boosting the jacking cross beam (24), and the lower slewing support (22) and the jacking cross beam (24) are respectively provided with rotatable step-changing climbing claws (223) and rotatable jacking climbing claws which are positioned and matched with the tower body assembly (1).

7. A tower crane according to any one of claims 1 to 5, characterised in that The inner side of the lower slewing support (22) is provided with a roller assembly (225) which is guided and matched with the tower body assembly (1).

8. A method of construction of a tower crane, applied to a tower crane according to any one of claims 1 to 7, characterised in that, The crane construction method comprises: The upper slewing support (21) is controlled to rotate the horizontal lifting arm (31) to a working position corresponding to the placing platform (221), the hoisting mechanism is controlled to transfer a standard section (11) to be introduced on the ground to the placing platform (221) through the luffing trolley (34), the hoisting mechanism is controlled to hoist a new standard section (11) through the luffing trolley (34), and the luffing trolley (34) is controlled to move to a trimming position on the horizontal lifting arm (31); The upper slewing support (21) is controlled to rotate the horizontal lifting arm (31) to a avoiding position avoiding the placing platform (221), the lower slewing support (22) is supported on the tower body assembly (1), the hoisting device (32) is controlled to introduce the standard section (11) on the placing platform (221) into the lower slewing support (22) until the lower end surface of the standard section (11) contacts with the upper end surface of the tower body assembly (1), and after the standard section (11) is connected, the slewing mechanism (2) is controlled to climb along the tower body assembly (1).

9. Crane construction method according to claim 8, characterized in that, The supporting of the lower slewing support (22) on the tower body assembly (1) specifically comprises: The rotatable step-changing climbing claws (223) and the rotatable jacking climbing claws are supported on the steps of the standard section (11), and the transition section (12) in the lower slewing support (22) is removed.

10. Crane construction method according to claim 9, characterized in that, Before the hoisting device (32) is controlled to introduce the standard section (11) on the placing platform (221) into the lower slewing support (22) through the opening (311), it further comprises: The removed transition section (12) is placed on the placing platform (315) through the hoisting device (32); The opening (311) is opened by rotating the turnover door (312), the standard section (11) is hoisted to the position directly above the turnover door (312) through the hoisting device (32), and the horizontal lifting arm (31) is rotated to the working position.

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