In-situ conversion of large-scale jib tower crane of super high-rise building from external hanging to internal climbing construction method

Abstract

The present application relates to tower climbing technology field, especially to a kind of super high-rise building large-scale luffing tower crane in situ by conversion for internal climbing construction method of hanging outside.The construction method comprises the following steps: setting up the hanging support frame for fixing tower crane at the upper end of core tube;Core tube is capped, and steel structure is constructed at the top of core tube, and steel structure is arranged around the tower crane;A plurality of internal climbing support frames for connecting the tower crane are arranged upwards along the steel structure;The tower crane climbs from the hanging support frame to the internal climbing support frame, to convert the tower crane from the hanging outside working condition on the core tube to the internal climbing working condition in steel structure.The internal climbing support frame is arranged on the newly added steel structure after the core tube is capped, which solves the problem of no supporting structure attachment point for the hanging tower crane after the core tube structure is cancelled, achieves the goal of converting the tower crane from hanging outside to internal climbing in situ, improves the adaptability of luffing tower crane construction, and improves the overall construction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tower crane climbing, in particular to a method for converting a large-scale mobile-jib tower crane of an ultra-high-rise building from an external hanging to an internal climbing. BACKGROUND

[0002] As the most important vertical transportation tool in the construction of an ultra-high-rise building, a mobile-jib tower crane is usually attached to a core tube to form an internal climbing or external hanging form, and can be gradually climbed upward along with the construction process. The mobile-jib tower crane generally needs three sets of support systems during construction. The lowermost set is used to bear the most important vertical force of the tower crane, the middle set is used to fix the tower crane and bear the horizontal force generated during the operation of the tower crane, and the uppermost set is usually installed and used when the tower crane needs to be climbed. The three sets of support frames are alternately used during the climbing process, and the tower crane is gradually climbed by sequentially changing steps through climbing sections, jacking cylinders and climbing belts.

[0003] With the increase of the height of an ultra-high-rise building, the core tube concrete structure will inevitably be gradually reduced or even cancelled. The reduction or cancellation of the structure of the tower crane position will inevitably affect the climbing of the tower crane. Most ultra-high-rise buildings will cancel the core tube concrete structure when reaching a certain height, and change to a steel structure which is more convenient and rapid for construction. The cancellation of the core tube concrete structure affects the layout of the tower crane support frame position. The steel structure has no position to serve as the stress point of the external hanging support frame girder, thereby affecting the climbing and construction of the tower crane. SUMMARY

[0004] In order to solve the above problems, the present application provides a method for converting a large-scale mobile-jib tower crane of an ultra-high-rise building from an external hanging to an internal climbing. The tower crane is located outside the core tube in the external hanging working condition. The tower crane is arranged on the core tube through an external hanging support structure. The external hanging support structure comprises a plurality of external hanging support frames connected with the core tube and arranged along the tower crane. The construction method comprises the following steps:

[0005] An external hanging support frame for fixing the tower crane is arranged at the upper end of the core tube;

[0006] The core tube is capped, and a steel structure is constructed at the top end of the core tube. The steel structure is arranged around the tower crane;

[0007] A plurality of internal climbing support frames for connecting the tower crane are arranged upward along the steel structure;

[0008] The tower crane is climbed from the external hanging support frame to the internal climbing support frame, so as to convert the external hanging working condition of the tower crane on the core tube to the internal climbing working condition in the steel structure.

[0009] Further, the construction of the internal climbing support frame comprises:

[0010] At least two force main girders, wherein two of the force main girders are arranged in parallel on the outside of the tower crane, and two ends of each of the force main girders are connected with the steel structure for supporting the tower crane;

[0011] Further, the horizontal support frame further comprises a plurality of horizontal support rods, one end of each of the horizontal support rods is connected with the force main girder, and the other end of each of the horizontal support rods is connected with the steel structure.

[0012] Further, the inner climbing support frame comprises four force main girders, and the four force main girders are arranged in an X shape.

[0013] Further, the inner climbing support frame further comprises a stirrup and a first C-shaped frame arranged on the outside of the tower crane, the stirrup is arranged on the force main girder, and the first C-shaped frame is arranged on the stirrup.

[0014] Further, during the core tube capping construction, the column foot of the steel structure is embedded on the top of the core tube, the steel structure is constructed upward on the column foot of the steel structure, the inner climbing support frame is arranged on the steel structure, and the tower crane climbs upward along the inner climbing support frame until the steel structure is capped.

[0015] Further, the outer hanging support frame comprises two support main girders connected with the core tube, a second C-shaped frame arranged between the two support main girders, and a vertical inclined support rod having one end connected with the support main girder and the other end connected with the core tube.

[0016] Further, the outer hanging support frame further comprises at least one horizontal inclined support rod, one end of the horizontal inclined support rod is connected with the outside of the support main girder, and the other end of the horizontal inclined support rod is connected with the core tube.

[0017] Further, the second C-shaped frame is connected with the support main girder through a stirrup.

[0018] The present application provides a method for converting an outer hanging large-scale tower crane into an inner climbing tower crane in situ in a super high-rise building, wherein the tower crane is fixed on the core tube through the outer hanging support frame during the construction process of the tower crane in the outer hanging mode, as the height of the super high-rise building increases, the core tube concrete structure gradually decreases or even disappears, and after the core tube is capped, a steel structure is arranged on the top of the core tube, due to the change of the structure form, the outer hanging support frame cannot be installed on the steel structure, the inner climbing support frame is arranged on the steel structure, the outer hanging support frame of the tower crane is changed into two force main girders supported on the steel structure floor newly added after the core tube is capped, the inner climbing support frame is used for supporting the steel beam of the steel structure, the tower crane gradually climbs from the outer hanging support frame to the inner climbing support frame, the tower crane is converted from the outer hanging mode into the inner climbing mode in situ, and the tower crane stops climbing until the steel structure is capped.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] 1) The tower crane in-situ conversion from external hanging to internal climbing construction method provided by the application sets internal climbing support frames on the newly added steel structure after the core tube is capped, solves the problem of no supporting structure attachment point for the external hanging tower crane after the core tube structure is cancelled, realizes the goal of converting the tower crane in-situ from external hanging to internal climbing, improves the construction adaptability of the luffing tower crane, and improves the overall construction benefit;

[0021] 2) The tower crane in-situ conversion from external hanging to internal climbing construction method provided by the application sets multiple load-bearing main beams and horizontal struts on the steel structure as internal climbing support frames, solves the support of the luffing tower crane on the steel structure, and realizes the technical effect of converting the tower crane in-situ from external hanging to internal climbing;

[0022] 3) The tower crane in-situ conversion from external hanging to internal climbing construction method provided by the application has strong applicability of the horizontal diagonal struts in the external hanging support frame, which can meet the effect of supporting the tower crane in-situ under the contraction of the core tube wall cross section. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the application of converting the large luffing tower crane in-situ of the super high-rise building from external hanging to internal climbing.

[0024] Figure 2 It is a schematic diagram of the external hanging support frame in the application of converting the large luffing tower crane in-situ of the super high-rise building from external hanging to internal climbing.

[0025] Figure 3 It is a schematic diagram of the horizontal diagonal struts of the external hanging support frame in the application of converting the large luffing tower crane in-situ of the super high-rise building from external hanging to internal climbing.

[0026] Figure 4 It is a structural schematic diagram of the internal climbing support frame in the steel structure of the application of converting the large luffing tower crane in-situ of the super high-rise building from external hanging to internal climbing.

[0027] Figure 5 It is a structural schematic diagram of the internal climbing support frame in the application of converting the large luffing tower crane in-situ of the super high-rise building from external hanging to internal climbing.

[0028] Figure 6 It is a construction flowchart of the application of converting the large luffing tower crane in-situ of the super high-rise building from external hanging to internal climbing.

[0029] 10 - tower crane; 20 - core tube; 30 - external support frame; 31 - support main beam; 32 - second C-shaped frame; 33 - vertical diagonal bracing rod; 34 - horizontal diagonal bracing rod; 341 - support beam; 342 - connecting head; 343 - first outer tube; 344 - second outer tube; 345 - adjusting inner tube; 346 - adjusting rod; 35 - ear plate; 36 - stirrup; 37 - mounting seat; 40 - internal climbing support frame; 41 - force-bearing main beam; 42 - horizontal bracing rod; 43 - first C-shaped frame; 50 - steel structure. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0031] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connection", "connection" should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, and those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0032] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the present application.

[0033] In addition, in the description of the present application, the terms "first", "second" are only used to distinguish in description.

[0034] The present application provides a method for converting a large-scale mobile arm tower crane of a super high-rise building from external hanging to internal climbing in situ. During the construction of the super high-rise building, the mobile arm tower crane 10 forms an external hanging form on the core tube 20 and climbs upward. The tower crane 10 is located outside the core tube 20 when in external hanging working condition. The tower crane 10 is arranged on the core tube 20 through an external support structure. The external support structure comprises a plurality of external support frames 30 connected with the core tube 20 and arranged along the tower crane 10. The construction method comprises the following steps:

[0035] The outer hanging support frame 30 is arranged at the upper end of the core tube 20 for fixing the tower crane 10, and the tower crane 10 is fixed by the outer hanging support frame 30 before the core tube 20 is capped, and the tower crane 10 is in the outer hanging working condition;

[0036] The core tube 20 is capped, and a steel structure 50 is constructed at the top end of the core tube 20, and the steel structure 50 is arranged around the tower crane 10, and the steel structure 50 is constructed at the top end of the core tube 20, and the steel structure 50 is also arranged around the tower crane 10, and the inner climbing support frame 40 for fixing the tower crane 10 is arranged on the steel structure 50, so that the tower crane 10 can be climbed in situ;

[0037] A plurality of inner climbing support frames 40 for connecting the tower crane 10 are arranged upward along the steel structure 50, specifically, during the upward construction of the steel structure 50, the inner climbing support frames 40 are arranged at corresponding positions of the steel structure 50 for fixing the tower crane 10 and for climbing of the tower crane 10, and the tower crane is converted from the outer hanging working condition to the inner climbing working condition;

[0038] The tower crane 10 is climbed from the outer hanging support frame 30 to the inner climbing support frame 40, so as to convert the tower crane 10 from the outer hanging working condition on the core tube 20 to the inner climbing working condition in the steel structure 50.

[0039] As shown in the accompanying drawings, Figure 1 Fig. (a) is a schematic diagram of an outer hanging state of a tower crane, Fig. (b) is a schematic diagram of an outer hanging to inner climbing state of a tower crane, and Fig. (c) is a schematic diagram of an inner climbing state of a tower crane.

[0040] In an optimal embodiment, the outer hanging support frame 30 comprises two support main beams 31 connected with the core tube 20, a second C-shaped frame 32 arranged between the two support main beams 31, and a vertical diagonal bracing 33 connected with the support main beam 31 at one end and connected with the core tube 20 at the other end, and the outer hanging support frame 30 further comprises at least one horizontal diagonal bracing 34, one end of the horizontal diagonal bracing 34 being connected with the outer side of the support main beam 31, and the other end being connected with the core tube 20, and the support main beam 31, the vertical diagonal bracing 33, and the horizontal diagonal bracing 34 are provided with an ear plate 35 at the connection position with the core tube 20 for connection on the core tube, and the ear plate 35 is connected with a pre-buried part on the core tube 20 for fixing of the support frame.

[0041] Specifically, before the core tube 20 is capped, the installation position of the outer hanging support frame 30 on the upper end of the core tube is confirmed, a buried part for connecting with the outer hanging support frame 30 is arranged on the core tube 20, the buried part can be an anchor plate, an anchor rod, etc., one end of the support main beam 31 is connected with the pre-buried buried part, the other end is connected with a vertical inclined bracing rod 33, the other end of the vertical inclined bracing rod 33 is connected on the core tube 20, the installation height of the vertical inclined bracing rod 33 at one end of the core tube 20 is lower than the installation height on the support main beam 31, for supporting the support main beam 31, the second C-shaped frame 32 is arranged on the two support main beams 31, the second C-shaped frame 32 can be welded or threadedly connected on the support main beam 31.

[0042] The two support main beams 31 are provided with two second C-shaped frames 32, the second C-shaped frame 32 is π-shaped, the two second C-shaped frames 32 enclose a receiving hole capable of accommodating a tower crane, a stirrup 36 is arranged between the second C-shaped frame 32 and the support main beam 31, a plurality of groups of bolt holes are arranged on the stirrup 36, both ends of the second C-shaped frame 32 are provided with bolt holes corresponding to the bolt holes of the stirrup 36, the second C-shaped frame 32 and the stirrup 36 are connected through bolts, the position or size of the receiving hole can be adjusted by adjusting the connection position of the second C-shaped frame 32 on the stirrup 36, and the applicability of the outer hanging support frame is improved.

[0043] Preferably, the outer hanging support frame 30 further comprises at least one horizontal inclined bracing rod 34, one end of the horizontal inclined bracing rod 34 is connected with the outer side of the support main beam 31, the other end is connected with the core tube 20, as shown in the accompanying drawings Figure 2 and 3 In the embodiment, the outer hanging support frame 30 comprises two horizontal inclined bracing rods 34, the outer side of the support main beam 31 is provided with a mounting seat 37, one end of the horizontal inclined bracing rod 34 is hinged with the mounting seat 37, the other end is connected with the core tube 20, the horizontal inclined bracing rod 34 can strengthen the strength of the outer hanging support frame 30, and the core tube 20 can also be pre-buried with a buried part at the connection position of the horizontal inclined bracing rod 34, for connecting and fixing the horizontal inclined bracing rod 34.

[0044] As shown in the accompanying drawings Figure 3As shown, the horizontal diagonal brace 34 includes a support beam 341, a connector 342, and an adjustable adjustment assembly disposed between the support beam 341 and the connector 342. The adjustment assembly includes a first outer tube 343, a second outer tube 344, and an adjusting inner tube 345. The outer walls of both ends of the adjusting inner tube 345 are respectively provided with external threads in opposite directions. The two ends of the adjusting inner tube 345 are respectively inserted into the first outer tube 343 and the second outer tube 344. The inner walls of the first outer tube 343 and the second outer tube 344 are respectively provided with internal threads that mate with the external threads of the adjusting inner tube 345. The length of the horizontal diagonal brace 34 can be adjusted by rotating the inner tube 345, making it highly adaptable. Multiple adjusting rods 346 are provided on the outside of the adjusting inner tube 345. The adjusting rods 346 can be welded or threaded onto the adjusting inner tube 345. The first outer tube 343 and the support beam 341 are detachably connected by a flange, and the second outer tube 344 and the connector 342 are detachably connected by a flange. Both the support beam 341 and the connector 342 are provided with mounting holes, which can be rotated to connect with the connection point to adjust the installation angle and improve the applicability of the installation.

[0045] When the core tube 20 is capped, the column bases of the steel structure 50 are pre-embedded at the top of the core tube 20, and the steel columns and beams of the steel structure 50 are constructed upward on the column bases of the steel structure 50. The steel structure 50 is also arranged around the tower crane. The position of the inner climbing support frame 40 on the steel structure 50 is confirmed, and the inner climbing support frame 40 is arranged on the steel structure 50. During the upward construction of the steel structure 50, multiple inner climbing support frames 40 are evenly arranged on the steel structure 50 until the steel structure is capped. The tower crane climbs upward along the inner climbing support frame 40 until the steel structure is capped.

[0046] After the core tube 20 is capped, there is no suitable location on the 50th floor of the steel structure to serve as a load-bearing point for the main beam of the tower crane support frame. The external support frame 30 cannot be used as a support frame on the steel structure. Therefore, an internal climbing support frame 40 is installed on the steel structure, and at least two load-bearing main beams 41 are installed on the steel structure. When two load-bearing main beams 41 are installed on the steel structure 50, they are arranged in parallel on both sides of the tower crane. The two ends of the load-bearing main beams 41 are welded or bolted to the steel structure. The support frame has four support points on the steel structure. One of the two parallel load-bearing main beams 41 is located near the support of the steel beam in the steel structure. The other load-bearing main beam 41 is supported in the middle of the steel beam in the steel structure 50, where the deflection of the steel beam is greater than at the support. Therefore, the deformation of the support frame located in the middle of the steel beam is greater than at the support, which to some extent affects… The overall verticality of the tower crane and the deformation of the steel beams affect the tower crane and may even threaten its safety. Therefore, it is necessary to add support points on the steel beams. Preferably, a new main load-bearing beam 41 perpendicular to the two main load-bearing beams 41 can be added. The new main load-bearing beam 41 is preferably located in the middle of the steel beam. In this embodiment, two new main load-bearing beams 41 are added. The four main load-bearing beams 41 intersect in pairs to form a grid-shaped support structure. The enclosed area of ​​the grid-shaped support structure is used to accommodate the tower crane, and the number of support points increases from 4 to 8. Of course, in actual use, different numbers and positions of main load-bearing beams 41 can be set on the steel structure 50 according to the actual installation requirements of the tower crane. Other load-bearing points can be added to ensure the safety of the tower crane. The number and installation position of the main load-bearing beams 41 in this embodiment are only one installation method.

[0047] Furthermore, the internal climbing support frame 40 has a grid-shaped support structure, which increases the stress points of the tower crane load and reduces the deflection deformation of the main load-bearing components. The support frame position in the middle of the tower crane body is mainly subjected to horizontal forces. When the lateral bending and torsional forces on the steel beams are too large during steel structure construction, the steel beams will lose overall stability. Horizontal struts 42 can be added. One end of the horizontal strut 42 is connected to the main load-bearing beam 41, and the other end is connected to the steel column of the steel structure 50. The horizontal strut 42 can be welded to the main load-bearing beam 41 and the steel column. The horizontal strut 42 can transfer most of the horizontal force to the main steel column of the steel structure through the horizontal strut 42, reducing the risk of steel beam instability. (See attached instruction manual) Figure 4 and 5 As shown, in this embodiment, two horizontal struts 42 are provided. The horizontal struts 42 are connected to the intersection point of the load-bearing main beam 41 located in the middle, and the other end is connected to the support of the nearest steel beam (i.e., the position of the steel column).

[0048] Furthermore, horizontal struts 42 can be added in other locations. One end of the horizontal strut 42 is connected to the load-bearing main beam 41, and the other end is connected to the steel column of the steel structure 50. Most of the horizontal force can be transferred to the main steel column through the horizontal strut 42, reducing the risk of steel beam instability and improving the strength of the inner climbing support frame 40.

[0049] Specifically, the main load-bearing beams 41 form a grid-like structure, with a receiving hole in the middle to accommodate the tower crane. The inner climbing support frame also includes stirrups and a first C-shaped frame 43. The stirrup structure of the inner climbing support frame is the same as that of the outer support frame, and will not be described in detail here. The first C-shaped frame 43 and the stirrups are connected by bolts. After confirming the installation position of the first C-shaped frame 43, the stirrups are welded to the main load-bearing beams 41. Bolt holes are provided at both ends of the first C-shaped frame 43 to connect the first C-shaped frame 43 to the stirrups.

[0050] As the steel structure on the core tube 20 is constructed, an internal climbing support frame 40 is installed on the steel structure 50. During the climbing process, the tower crane gradually changes from external hanging to internal climbing. The internal climbing support frame 40 is equipped with multiple load-bearing main beams 41 and horizontal struts 42 to meet the stress requirements of the tower crane and ensure its safety, so that the tower crane can complete the conversion from external hanging to internal climbing in situ.

[0051] As per the instruction manual Figure 6 The diagram shown illustrates the construction process of converting the luffing jib tower crane from its in-situ external mounting state to its internal climbing state in this embodiment. The right side represents the construction process in the external mounting state, the middle side represents the conversion from external to internal climbing state, and the left side represents the conversion from external to internal climbing state. The specific steps are as follows:

[0052] Step 1: Determine the installation position of the external support frame 30. Construct the Nth external support frame 30 at the upper end of the core tube 20, where N≥2 and N is a positive integer. This includes the pre-embedding of support frame embedded parts and the pouring of core tube concrete. Then, chisel the support frame embedded parts, install the main support beam 31 on the embedded parts, weld the ear plate to the main support beam, and install the vertical diagonal brace 33 and the horizontal diagonal brace 34 for reinforcement of the external support frame 30. Install the second C-shaped frame 32 on the main support beam 31 to form an external support structure for supporting the tower crane. After the installation of the external support structure is completed, the tower crane is in the external climbing state.

[0053] Step 2: The core tube 20 is capped. During the capping of the core tube 20, steel column bases are pre-embedded at the top, and the steel structure construction is carried out to complete the steel structure construction at the N+1th support frame position, including the connection of steel columns and steel beams of the steel structure, mainly through welding fixation. Then, the load-bearing main beam 41 and horizontal struts 42 are installed on the steel structure to form an inner climbing support frame. The load-bearing main beam 41 and horizontal struts 42 are fixed to the steel structure by welding. Then, stirrups are welded on the load-bearing main beam 41, and the first C-shaped frame is installed on the stirrups to form an inner climbing support structure for supporting the tower crane. After the inner climbing support structure is completed, the tower crane changes from external hanging to inner climbing.

[0054] Step 3: As the tower crane climbs, complete the steel structure construction at the N+2th support frame position, and complete the construction of the N+2th inner climbing support frame according to the construction process in Step 2. The tower crane is in the inner climbing state.

[0055] Step 4: Repeat Step 2 to continue constructing the steel structure and the internal climbing support frame on the steel structure until the steel structure is completed and the tower crane stops climbing.

[0056] In summary, this invention provides a method for converting a luffing tower crane in situ from external mounting to internal climbing in super high-rise building construction. When the luffing tower crane is on the core tube, it is in an external mounting state, fixed by an external support frame. The external support frame comprises a supporting main beam, a C-shaped frame, vertical diagonal braces, and horizontal diagonal braces, forming an external support structure. After the core tube is capped, a steel structure is installed at the top of the core tube, and a steel structure surrounds the luffing tower crane. An internal climbing support frame is then constructed on the steel structure to fix the luffing tower crane. The internal climbing support frame consists of a load-bearing main beam and horizontal braces, and is also equipped with stirrups for reinforcement, allowing the luffing tower crane to convert from an external mounting state to an internal climbing state. The internal climbing support frame is supported on the steel beams of the steel structure until the steel structure is capped, at which point the luffing tower crane stops climbing. This invention solves the problem of the lack of a support frame structure attachment point for the externally mounted luffing tower crane after the core tube structure is removed, achieving the goal of converting the tower crane in situ from external mounting to internal climbing, improving the adaptability of the luffing tower crane construction, and increasing overall construction efficiency.

[0057] Those skilled in the art will understand that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the invention. Although embodiments of the invention have been described, it should be understood that the invention is not limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for converting a large luffing tower crane in situ from external mounting to internal climbing construction in super high-rise buildings, wherein the tower crane is located outside the core tube in external mounting mode, and the tower crane is mounted on the core tube via an external mounting support structure, the external mounting support structure comprising multiple external mounting support frames connected to the core tube along the tower crane, characterized in that... The construction method includes the following steps: An external support frame for fixing the tower crane is provided at the upper end of the core tube; The core tube is capped, and a steel structure is constructed at the top of the core tube, with the steel structure surrounding the tower crane; Multiple internal climbing support frames for connecting the tower crane are installed upward along the steel structure; The tower crane climbs from the external support frame to the internal climbing support frame to change the tower crane's external hanging condition on the core tube to its internal climbing condition in the steel structure.

2. The method for converting ultra-high-rise large luffing tower cranes from external hanging to internal climbing construction as described in claim 1, characterized in that, The construction of the internal climbing support frame includes: At least two load-bearing main beams, wherein two of the load-bearing main beams are arranged in parallel on the outside of the tower crane, and both ends of each load-bearing main beam are connected to the steel structure to support the tower crane; It also includes multiple horizontal struts, one end of which is connected to the load-bearing main beam and the other end of which is connected to the steel structure.

3. The method for converting ultra-high-rise large luffing tower cranes from external hanging to internal climbing construction as described in claim 2, characterized in that, The internal climbing support frame includes four load-bearing main beams, which are arranged in a grid pattern, perpendicular to each other.

4. The method for converting ultra-high-rise large luffing tower cranes from external hanging to internal climbing construction as described in claim 1, characterized in that, The internal climbing support frame also includes stirrups and a first C-shaped frame located on the outside of the tower crane. The stirrups are installed on the load-bearing main beam, and the first C-shaped frame is installed on the stirrups.

5. The method for converting ultra-high-rise large luffing tower cranes from external hanging to internal climbing construction as described in claim 1, characterized in that, During the capping construction of the core tube, the column bases of the steel structure are pre-embedded at the top of the core tube, and the steel structure is constructed upward on the column bases. The internal climbing support frame is arranged on the steel structure, and the tower crane climbs upward along the internal climbing support frame until the steel structure is capped.

6. The method for converting ultra-high-rise large luffing tower cranes from external hanging to internal climbing construction as described in claim 1, characterized in that, The external support frame includes two main support beams connected to the core tube, a second C-shaped frame disposed between the two main support beams, and a vertical diagonal brace with one end connected to the main support beam and the other end connected to the core tube.

7. The method for converting ultra-high-rise large luffing tower cranes from external hanging to internal climbing construction as described in claim 6, characterized in that, The external support frame also includes at least one horizontal diagonal brace, one end of which is connected to the outside of the main support beam and the other end of which is connected to the core tube.

8. The method for converting ultra-high-rise large luffing tower cranes from external hanging to internal climbing construction as described in claim 6, characterized in that, The second C-shaped frame is connected to the supporting main beam via stirrups.

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