Accurate installation method for super high-rise tower crown construction

Abstract

The invention provides a precise mounting method for super high-rise tower crown construction, which comprises tower crown construction, and the tower crown construction is divided into three stages, namely, a construction section 1, a first movable arm tower crane and a second movable arm tower crane are used for mounting a section structure from the Nth layer to a roof layer of a tower crown; in the second construction section, a flat-arm tower crane is used for installing a roof layer-window cleaning machine layer section structure; and the construction section 3 is used, and the parking apron structure is assembled on the window cleaning machine layer from far to near by the roof crane. According to the precise installation method for super high-rise tower crown construction, the influence on indoor visual perception can be reduced to the maximum extent, interference of vertical face lines is reduced, through reasonable force distribution and a stable truss structure, the anti-seismic performance of a building can be improved, and the construction cost is reduced. And the structural form of the truss can effectively disperse external acting force in different directions, so that the overall stability of the tower crown part is enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of the construction and installation of super high-rise crowns, and particularly relates to a precise installation method for the construction of super high-rise crowns. Background Art

[0002] As a landmark node of a building, the super high-rise building crown not only undertakes multiple functions such as structural load-bearing and equipment installation, but also directly affects the overall aesthetic image of the building. Under the trend of modern architectural design, the requirement for the visual permeability of the crown structure is increasing day by day. Due to problems such as exposed components and complex joints in the traditional structural system, it is difficult to meet the design requirements. In order to minimize the interference of structural components on the indoor visual experience and facade lines, the current design concept tends to arrange the structural components in combination with the ridge lines on the facade, forming a cross-facade support structural system similar to a spatial skew grid structure.

[0003] However, this new structural system faces many challenges in practical applications. First of all, the node design of the spatial skew grid structure is complex, which poses extremely high requirements for manufacturing accuracy and on-site installation. Secondly, due to the close combination of components and the facade, any minor installation error may cause facade deformation and affect the overall beauty of the building. In addition, the crown top usually needs to carry heavy equipment such as high-position water tanks and communication equipment. The traditional load transfer method often requires the setting of additional support components, which not only increases the structural self-weight but also destroys the integrity of the building.

[0004] For the support of heavy loads such as high-position water tanks, the current design scheme tends to adopt a truss scheme with the bottom of the water tank as the lower chord and the main beam of the window cleaning machine layer as the upper chord. This scheme utilizes the existing structure of the main beam of the window cleaning machine layer, reduces the number of newly added components, and reduces the structural self-weight. However, the bearing capacity and stiffness of the main beam of the window cleaning machine layer are limited, and fine mechanical analysis and structural optimization are required to ensure that it can safely and reliably support the water tank load. At the same time, the connection method between the bottom of the water tank and the main beam of the window cleaning machine layer is also crucial, and high-strength and high-reliability connection technologies need to be adopted to prevent the connection failure from causing the water tank to fall.

[0005] In addition, the construction environment of the super high-rise building crown is complex, and the risk of high-altitude operations is high, which poses extremely high requirements for construction technology and management level. The traditional steel structure construction method mainly relies on manual welding and lifting equipment, and has problems such as low efficiency, high safety risk, and difficult quality control. With the continuous breakthrough of building height and the increasing complexity of the shape design, the traditional construction method has been difficult to meet the project requirements. Summary of the Invention

[0006] The technical problem solved by the present invention is to provide a precise installation method for the super high-rise crown construction, which combines structural members with the elevation ridge line, helps to minimize the impact on the indoor visual experience, and reduces the interference of elevation lines. Through reasonable force distribution and a stable truss structure, the seismic performance of the building can be improved. The structural form of the truss can effectively disperse external forces in different directions, thereby enhancing the overall stability of the crown part.

[0007] To solve the above technical problems, the precise installation method for the super high-rise crown construction provided by the present invention includes: crown construction, installation construction, comprehensive measures for crown installation, and safety guarantee measures;

[0008] The crown construction is divided into three stages, specifically as follows:

[0009] Construction section 1: Use the 1# and 2# luffing tower cranes to install the structure of the crown from the 57th floor to the roof floor;

[0010] Construction section 2: Use the 6# flat-top tower crane to install the structure of the section from the roof floor to the window cleaning machine floor;

[0011] Construction section 3: Use the 7# roof crane to assemble the helipad structure from far to near on the window cleaning machine floor. After the assembly is completed, adopt the hydraulic jacking construction process. After the helipad structure is jacked into place, use a 2-ton gin pole to install the patch steel column of the helipad.

[0012] As a further scheme of the present invention, the process of construction section 1 is divided into a first step and a second step. The process of the first step in construction section 1 is as follows:

[0013] (1). Lift and install the first section of the column on the 57th floor, temporarily fix the steel column, and after the alignment is completed, use welding backing to reinforce and then the tower crane unhooks;

[0014] (2). After the steel column welding is completed, install the steel beam. The steel beam is a circular tube beam, and the connection with the steel column is a through-weld. After backing reinforcement, the tower crane unhooks;

[0015] (3). Repeat the above installation process until the installation of the steel beam on the roof floor is completed. The installation process of the steel beams on the 58th, 59th, and 60th floors is the same as that of the outer frame standard. After the installation of the steel beam on the 60th floor is completed, immediately complete the laying of the truss slab and concrete pouring to provide a site for the erection of the operation scaffold.

[0016] As a further scheme of the present invention, the process of the second step in construction section 1 is as follows:

[0017] (1). Lift and install the first section of the column of WD1, temporarily fix the steel column, and after the alignment is completed, use welding backing to reinforce and then the tower crane unhooks;

[0018] (2) After the welding of the steel columns is completed, continue to install the steel beams upward. The steel beams are circular tube beams, and the connection with the steel columns is a penetrant weld. After the backing reinforcement is completed, the tower crane unhooks.

[0019] (3) Install the steel stairs and the steel components of the pipe shaft. The steel structure stairs are assembled on the ground and then hoisted as a whole. After the welding of the steel components in the shaft and the steel stairs is completed, it can be used as the north-side construction up-and-down passage during the installation process of the tower crown.

[0020] (4) Repeat the above installation process until the hoisting of the outer frame steel beams on the window cleaning machine platform layer is completed.

[0021] (5) Hoist the upper chord members of the long-span truss on the window cleaning machine platform layer. These components are hoisted in sections and welded immediately after hoisting is completed to form a stable structure with the steel columns, steel beams, and upper chord members of the truss.

[0022] (6) Set up a woven safety net at the 356m elevation. After the net is fixed firmly, conduct the "high-drop test" as required. After the test results are qualified, hoist the lower chord members of the long-span truss. Before hoisting the lower chord members, set up a standardized walkway board on one side of the truss. The lower chord members of the truss can be unhooked only after the welding is completed.

[0023] As a further solution of the present invention, the process of the construction section 2 is as follows:

[0024] (1) Complete the hoisting of the steel beams on the water tank layer, and pre-store the water tank components above the steel beams on the water tank layer after the welding of the steel beams is completed.

[0025] (2) Continue to install and complete the steel beams on the window cleaning machine layer, and thus complete the installation of the second stage.

[0026] As a further solution of the present invention, the process of the construction section 3 is divided into a first step and a second step. The process of the first step in the construction section 3 is as follows:

[0027] (1) Hoist the outer frame columns on the helipad layer. Set up a standardized steel climbing ladder with a protective cage before hoisting the steel columns.

[0028] (2) Adopt the reverse installation method. First, install the outermost outer frame beam of the helipad, and then install the intermediate layer outer frame beams.

[0029] (3) Set up a falsework on the window cleaning machine layer to support the cross-shaped steel beams of the helipad.

[0030] (4) Install the pin shafts and cables of the cross-shaped beams. After calibration, carry out welding. After the backing weld is completed, the tower crane can unhook.

[0031] (5) Install the steel beams and pin shafts corresponding to the pin shafts at the four corners of the helipad in the east, west, south, and north directions. After calibration, carry out welding, and install the remaining floor beams of the helipad.

[0032] (6). Install the steel staircase and remove the support falsework. Thus, the installation of the entire steel structure crown is completed.

[0033] As a further solution of the present invention, the process of the second step in the construction section 3 is as follows:

[0034] (1). Assemble the upper structure of the helipad on the window cleaning machine platform layer, and complete the welding and related reinforcement work;

[0035] (2). Set up lifting brackets. There are 4 lifting brackets, and the height of the lifting brackets does not exceed the aviation height limit requirement of 374m;

[0036] (3). Complete the preparatory work before lifting. After lifting 50mm, let it stand for 24h. After 24h, check whether the lifting system and the structure to be lifted meet the requirements. After checking that the structure is qualified, lift the entire helipad structure to the design elevation;

[0037] (4). After standing for 24h at the design elevation, install the patch steel column and remove the lifting system. Thus, the installation of the entire steel structure crown is completed.

[0038] As a further solution of the present invention, the steps of the installation construction are specifically as follows:

[0039] The first step: Install the crown structure of the 57th to 59th floors with Tower Crane No. 1 and Tower Crane No. 2;

[0040] The second step: After the luffing tower crane completes the construction of the roof layer structure, install Tower Crane No. 6 on the roof layer, set up the support falsework and install the structure below the WD4 layer from the roof layer to the window cleaning machine layer;

[0041] The third step: The flat-top tower crane installs the horizontal structure of the WD4 layer of the window cleaning machine;

[0042] The fourth step: After the 26-ton roof crane removes the flat-top tower crane, install the tower crane opening members of the WD4 layer of the window cleaning machine;

[0043] The fifth step: Set up a hydraulic jacking device on the WD4 layer of the window cleaning layer;

[0044] The sixth step: When the 26-ton roof crane is at the initial height and the boom angle does not exceed 20°, assemble the distal members of the WD5 of the helipad and the WD6 of the crown roof layer;

[0045] The seventh step: The 26-ton roof crane descends 2 standard section heights, and when the boom angle does not exceed 33°, assemble the middle members of the WD5 of the helipad and the WD6 of the crown roof layer;

[0046] The eighth step: The 26-ton roof crane descends another 6 standard section heights, and when the boom angle does not exceed 75°, assemble the proximal members of the WD5 of the helipad and the WD6 of the crown roof layer;

[0047] Step 9: After the apron WD5 and tower crown roof layer WD6 structures are assembled, the overall hydraulic jacking construction is carried out;

[0048] Step 10: After the apron WD5 and tower crown roof layer WD6 structures are lifted to the design elevation, the far-end embedded steel columns are installed by using pull rods, and the near-end embedded steel columns are installed by using roof cranes;

[0049] Step 11: First unload the hydraulic lifting device on the window cleaning machine layer WD4;

[0050] Step 12: Finally complete the unloading of the bottom support tire frame.

[0051] As a further scheme of the present invention, the comprehensive measures for tower crown installation include oblique grid structure tower crown construction technology. The oblique grid structure tower crown construction technology is based on the installation of the tower crown with a combined support frame and a hydraulic jacking device as the construction basis, and implements full-process simulation analysis and calculation as well as monitoring and supervision. At the same time, customized and standardized protection, adjustable screw rods, rigid temporary tie rods, hydraulic devices + oblong hole controllable variable adjustment measures are adopted to ensure construction quality and safety.

[0052] As a further solution of the present invention, the safety measures are as follows:

[0053] 1). During the construction of the tower crown, a steel pipe scaffolding is added as an operating frame to increase process safety;

[0054] 2). The tower crown structure is complex, the wind force at 380m is strong, and the visibility is poor during nighttime construction, so nighttime construction is prohibited;

[0055] 3). Install external protective nets on the 57th floor of the tower, the roof layer, and the maintenance walkway layer to prevent falling objects;

[0056] 4). A 3m*6m standard safety net is used to assemble the hollowed-out position of the tower crown, and a welded lifting bracket is installed. Workers use pulleys to pull the bracket to stretch the assembled safety net to the specified height. After the steel structure is installed, the safety net is removed as a whole by loosening the wire rope.

[0057] As a further solution of the present invention, the erection of the operating frame is divided into two stages, such as stage one: 282m~304m-57-story structure and stage two: 317m~356m. The erection of the operating frame includes the following:

[0058] (1) The operation frame is constructed using steel pipe scaffolding: the basic structure adopts a fastener-type steel pipe frame, uses φ48×3.6 mm steel pipes, and is equipped with 1000×800 mm welded steel mesh scaffolding boards;

[0059] (2) Layout parameters: horizontal spacing of vertical poles is 0.9 meters, vertical spacing is 1.5 meters, step distance is 1.8 meters, and the outer vertical poles are set with 0.6-meter interval waist poles;

[0060] (3). Safety measures: Set φ20×250 mm stirrups at the edge of the floor slab, the depth of the implanted bars is not less than 100 mm, set the wall connecting members at two steps and one span, adopt the fixed method of holding the column, and the top surface of the operation scaffold is 800 mm lower than the installation position of the horizontal truss;

[0061] (4). Erection volume: 47910m 3 , with a weight of about 958.2t.

[0062] Compared with the related technologies, the precise installation method for the construction of the super high-rise crown provided by the present invention has the following beneficial effects:

[0063] 1. In the present invention, by using the bottom of the water tank as the lower chord and the main beam of the window cleaning machine layer as the upper chord, it can effectively simplify the layout of the structural system. This not only reduces redundant structural members but also optimizes the mechanical transmission and improves the overall efficiency of the structure;

[0064] 2. The present invention adopts a truss structure, which can ensure that the load is reasonably distributed through the upper chord and the lower chord, reduce the concentration of local loads, avoid uneven local stress of the structure, and improve the stability and safety of the structure;

[0065] 3. In the present invention, the structural members are arranged in combination with the elevation ridge line, which helps to minimize the impact on the indoor visual experience and reduce the interference of the elevation lines. Through the reasonable distribution of forces and the stable truss structure, the seismic performance of the building can be improved. The structural form of the truss can effectively disperse external forces in different directions, thereby enhancing the overall stability of the crown part; Brief Description of the Drawings

[0066] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0067] Figure 1 It is a schematic diagram of the crown of the skewed grid structure of the present invention;

[0068] Figure 2 It is a schematic diagram of the division of the construction section of the crown structure of the present invention;

[0069] Figure 3 It is a schematic flow diagram of the installation construction steps of the present invention;

[0070] Figure 4 It is a schematic flow diagram of the first step in construction section 1 of the present invention;

[0071] Figure 5 It is a schematic flow diagram of the second step in construction section 1 of the present invention;

[0072] Figure 6 It is a schematic flow diagram of construction section 2 of the present invention;

[0073] Figure 7 It is a schematic diagram of the first step process in construction section 3 of the present invention;

[0074] Figure 8 It is a schematic diagram of the second step process in construction section 3 of the present invention;

[0075] Figure 9 It is a schematic diagram of comprehensive measures for the installation of the tower crown of the present invention;

[0076] Figure 10 It is a schematic diagram of safety guarantee measures of the present invention;

[0077] Figure 11 It is a schematic diagram of the erection of the operation scaffold of the present invention. Detailed implementation manners

[0078] A precise installation method for the construction of a super high-rise tower crown includes: tower crown construction, installation construction, comprehensive measures for tower crown installation, and safety guarantee measures;

[0079] As Figure 2 shown, the tower crown construction is divided into three stages, specifically as follows:

[0080] Construction section 1: Use 1# and 2# luffing tower cranes to install the structure of the tower crown from the 57th floor to the roof floor;

[0081] Construction section 2: Use 6# horizontal boom tower crane to install the structure of the section from the roof floor to the window cleaning machine floor;

[0082] Construction section 3: Use 7# roof crane to assemble the helipad structure from far to near on the window cleaning machine floor. After the assembly is completed, adopt the hydraulic jacking construction process. After the helipad structure is jacked into place, use a 2-ton gin pole to install the embedded steel column of the helipad.

[0083] This tower crown construction plan simplifies the structural design, optimizes the force transmission, significantly improves the construction efficiency and safety by means of phased and multi-tower crane coordinated operations, and uses the water tank bottom plate and the main beam of the window cleaning machine floor as the upper and lower chords of the truss structure. Assembling the helipad structure from far to near with a roof crane and combining with the hydraulic jacking into place process avoids the direct hoisting of large components at high altitude, reduces the risk of high-altitude operations, and at the same time ensures the construction accuracy and quality. In addition, this plan effectively combines the structural components with the building functional areas, reduces the redundant structure, realizes the high integration of structure and function, optimizes the building appearance while ensuring the structural stability.

[0084] As Figure 4 shown, the process of construction section 1 is divided into a first step and a second step. The process of the first step in construction section 1 is as follows:

[0085] (1). Lift the first section of the column on the F57 floor, temporarily fix the steel column, and after alignment, use backing welding for reinforcement (backing thickness: 10 mm), then the tower crane can unhook after completion.

[0086] (2). After the welding of the steel column is completed, install the steel beam. The steel beam is a circular tube beam, and the connection with the steel column is a full-penetration weld. After backing welding for reinforcement (backing thickness: 10 mm), the tower crane can unhook.

[0087] (3). Repeat the above installation process until the installation of the steel beams on the roof layer is completed. The installation processes of the steel beams on the 58th, 59th, and 60th floors are the same as the outer frame standard. After the installation of the steel beams on the 60th floor is completed, immediately complete the laying of the truss plates and concrete pouring to provide a site for the erection of the operation scaffold.

[0088] This construction process, through a hierarchical and progressive method, first completes the installation of the steel columns and conducts preliminary welding and fixation, and then connects the circular tube steel beams and conducts reinforcement, ensuring the structural stability and bearing capacity. The use of a hierarchical and repetitive installation process improves the construction efficiency and facilitates quality control.

[0089] As Figure 5 shown, the second-step process in the construction section 1 is as follows:

[0090] (1). Lift the first section of the WD1 column, temporarily fix the steel column, and after alignment, use backing welding for reinforcement (backing thickness: 10 mm), then the tower crane can unhook.

[0091] (2). After the welding of the steel column is completed, continue to install the steel beam upward. The steel beam is a circular tube beam, and the connection with the steel column is a full-penetration weld. After backing welding for reinforcement (backing thickness: 10 mm), the tower crane can unhook.

[0092] (3). Install the steel staircase and the steel components of the pipe shaft. The steel structure staircase is assembled on the ground and then hoisted as a whole. After the welding of the steel components in the shaft and the steel staircase is completed, it can be used as the north-side construction up-and-down passage during the installation process of the tower crown.

[0093] (4). Repeat the above installation process until the hoisting of the outer frame steel beams on the window cleaning machine platform layer is completed.

[0094] (5). Hoist the long-span truss upper chord members on the window cleaning machine platform layer. These components are hoisted in sections and immediately welded after hoisting to form a stable structure with the steel columns, steel beams, and truss upper chord members.

[0095] (6). Set up a braided safety net at the 356 m elevation. After the net is firmly fixed, conduct a "high-drop test" as required. After the test results are qualified, hoist the long-span truss lower chord members. Before hoisting the lower chord members, set up a standardized walkway board on one side of the truss. The lower chord members of the truss can be unhooked only after the welding is completed.

[0096] After the installation of the foundation frame, the construction process quickly formed a stable structure by hoisting the upper chord of the large-span truss in sections and immediately welding it, laying the foundation for subsequent construction. The entire process was implemented step by step, with safety verification and standardized operations, effectively reducing the risk of high-altitude operations, improving construction efficiency and quality, and ensuring the stability and safety of the tower crown structure.

[0097] like Figure 6 As shown, the process of the construction section 2 is as follows:

[0098] (1) Complete the hoisting of the steel beams at the water tank layer, and after the welding of the steel beams is completed, pre-store the water tank components above the steel beams at the water tank layer;

[0099] (2) Continue to install the steel beam of the window cleaning machine layer upwards, thus completing the installation of Phase II.

[0100] like Figure 7 As shown, the process of the construction section 3 is divided into a first step and a second step. The process of the first step in the construction section 3 is as follows:

[0101] (1) When hoisting the outer frame columns of the apron layer, a standardized steel ladder with a guard cage shall be installed before hoisting the steel columns;

[0102] (2) Using the inverted installation method, first install the top outer frame beam of the apron, and then install the middle outer frame beam;

[0103] (3) The window cleaning machine layer is equipped with a frame to support the cross steel beams on the apron;

[0104] (4) Install the pins and cables of the cross beams, and after calibration, weld them. The tower crane can be unhooked only after the base welding is completed;

[0105] (5) Install the steel beams and pins corresponding to the pins at the four corners of the apron. After calibration, weld and install the remaining floor beams of the apron.

[0106] (6) Install the steel stairs and remove the supporting frame, thus completing the installation of the steel structure tower crown.

[0107] like Figure 8 As shown, the process of step 2 in the construction section 3 is as follows:

[0108] (1) Assemble the apron superstructure on the BMU platform and complete welding and related reinforcement work;

[0109] (2) Install lifting brackets at 4 locations, and the height of the lifting brackets shall not exceed the aviation height limit requirement of 374m;

[0110] (3) Complete the preparatory work before lifting, lift 50mm and let it stand for 24 hours. After 24 hours, check whether the lifting system and the structure to be lifted meet the requirements. After the structure is checked to be qualified, lift the apron structure as a whole to the designed elevation;

[0111] (4) After lifting to the designed elevation and letting it stand for 24 minutes, install the embedded steel columns and remove the lifting system. At this point, all installation work on the steel structure tower crown is completed.

[0112] like Figure 3 As shown, the steps of the installation construction are as follows:

[0113] Step 1: 1# and 2# tower cranes install the tower crown structure from 57th to 59th floors;

[0114] Step 2: After the boom crane completes the roof structure construction, install the 6# tower crane on the roof, set up the support frame to install the structure below the roof layer ~ window cleaning machine layer WD4 layer;

[0115] Step 3: Install the horizontal structure of WD4 on the window cleaning machine layer by using a horizontal arm tower crane;

[0116] Step 4: After the 26-ton roof crane dismantles the flat-arm tower crane, install the tower crane opening rod of the window cleaning machine layer WD4;

[0117] Step 5: Install a hydraulic lifting device on the window cleaning layer WD4;

[0118] Step 6: When the 26-ton roof crane is at the initial position and the boom angle does not exceed 20°, assemble the distal rods of the apron WD5 and the tower crown roof layer WD6;

[0119] Step 7: The 26-ton roof crane is lowered to 2 standard section heights, and the boom angle does not exceed 33° to assemble the middle rods of the apron WD5 and the tower crown roof layer WD6;

[0120] Step 8: The 26-ton roof crane is lowered to 6 standard sections, and the angle of the big arm does not exceed 75° to assemble the proximal rods of the apron WD5 and the tower crown roof layer WD6;

[0121] Step 9: After the apron WD5 and tower crown roof layer WD6 structures are assembled, the overall hydraulic jacking construction is carried out;

[0122] Step 10: After the apron WD5 and tower crown roof layer WD6 structures are lifted to the design elevation, the far-end embedded steel columns are installed by using pull rods, and the near-end embedded steel columns are installed by using roof cranes;

[0123] Step 11: First unload the hydraulic lifting device on the window cleaning machine layer WD4;

[0124] Step 12: Finally complete the unloading of the bottom support tire frame.

[0125] The construction plan achieved accurate installation and efficient construction of the tower crown structure through technical means such as multi-tower crane collaborative operation, phased assembly and hydraulic jacking. The low-rise structure was first completed by a boom tower crane, and then assembled at high altitude using a roof crane, avoiding the risk of directly hoisting large-span components and improving construction safety. The application of hydraulic jacking technology ensured the smooth positioning of the apron structure and facilitated the installation of subsequent embedded steel columns. By gradually lowering the roof boom angle, the assembly conditions were optimized and the construction efficiency was improved.

[0126] like Figure 9 As shown, the comprehensive measures for tower crown installation include oblique grid structure tower crown construction technology. The oblique grid structure tower crown construction technology is based on the tower crown installation with a combined support frame and a hydraulic jacking device as the construction basis, and implements full-process simulation analysis and calculation as well as monitoring and supervision. At the same time, it adopts customized and standardized protection, adjustable screw rods, rigid temporary tie rods, hydraulic devices + oblong hole controllable variable adjustment measures to ensure construction quality and safety.

[0127] like Figure 10 As shown, the security measures are as follows:

[0128] 1). During the construction of the tower crown, a steel pipe scaffolding is added as an operating frame to increase process safety;

[0129] 2). The tower crown structure is complex, the wind force at 380m is strong, and the visibility is poor during nighttime construction, so nighttime construction is prohibited;

[0130] 3). Install external protective nets on the 57th floor of the tower, the roof layer, and the maintenance walkway layer to prevent falling objects;

[0131] 4). A 3m*6m standard safety net is used to assemble the hollowed-out position of the tower crown, and a welded lifting bracket is installed. Workers use pulleys to pull the bracket to stretch the assembled safety net to the specified height. After the steel structure is installed, the safety net is removed as a whole by loosening the wire rope.

[0132] like Figure 11 As shown, the erection of the operating frame is divided into two stages, such as stage one: 282m~304m-57-story structure and stage two: 317m~356m. The erection of the operating frame includes the following:

[0133] (1) The operation frame is constructed using steel pipe scaffolding: the basic structure adopts a fastener-type steel pipe frame, uses φ48×3.6 mm steel pipes, and is equipped with 1000×800 mm welded steel mesh scaffolding boards;

[0134] (2) Layout parameters: horizontal spacing of vertical poles is 0.9 meters, vertical spacing is 1.5 meters, step distance is 1.8 meters, and the outer vertical poles are set with 0.6-meter interval waist poles;

[0135] (3) Safety measures: φ20×250 mm reinforcement bars are set at the edge of the floor slab, the depth of the embedded reinforcement bars is not less than 100 mm, wall ties are set every two steps and one span, and the column fixing method is adopted. The top surface of the operating frame is 800 mm lower than the installation position of the horizontal truss;

[0136] (4). Erection volume: 47910m 3 , weighing approximately 958.2t.

[0137] The safety guarantee system and the operation frame erection plan fully consider the risks of high-altitude operations and take multiple measures to ensure construction safety. Adding steel pipe scaffolding as an operation frame provides a more stable working platform and improves safety during construction. Setting up an external protective net and assembling it with a standard safety net effectively prevents falling objects from high altitudes and ensures the safety of ground personnel. The erection parameters of the operation frame are reasonable, and the use of fastener-type steel pipe frames and welded steel mesh scaffolding boards ensures the stability of the structure. Setting up the fixing methods of clamps, wall connections and column holders further enhances the safety of the operation frame.

[0138] In general, the present invention uses the bottom of the water tank as the lower chord and the main beam of the window cleaning machine layer as the upper chord, so that the layout of the structural system can be effectively simplified. This not only reduces redundant structural components, but also optimizes mechanical transmission and improves the overall efficiency of the structure.

[0139] The present invention adopts a truss structure to ensure that the load is reasonably distributed through the upper chord and the lower chord, reduce local load concentration, avoid uneven local force on the structure, and improve the stability and safety of the structure.

[0140] The present invention combines the structural components with the facade ridge line, which helps to minimize the impact on the indoor visual experience and reduce the interference of the facade lines. The reasonable distribution of force and the stable truss structure can improve the seismic performance of the building. The structural form of the truss can effectively disperse the external forces in different directions, thereby enhancing the overall stability of the tower crown.

[0141] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A precise installation method for the construction of a super-high-rise tower crown, characterized in that, Including the construction of the tower crown, and the construction of the tower crown includes the following construction stages: Construction section 1: Use the first luffing tower crane and the second luffing tower crane to install the sectional structures from the Nth height layer to the roof layer of the tower crown structure; Construction section 2: Use the flat-top tower crane to install the sectional structures from the roof layer to the window-washing machine layer; Construction section 3: Use the roof crane to assemble the helipad structure from far to near on the window-washing machine layer. After the assembly is completed, adopt the hydraulic jacking construction process. After the helipad structure is jacked into place, use the gin pole to install the patch steel columns of the helipad.

2. The precise installation method for the super high-rise crown construction according to claim 1, characterized in that: The process of construction section 1 is divided into the first step and the second step, and the process of the first step is as follows: (1). Lift and install the first column of the first preset height layer, temporarily fix the steel column, and after calibration, use welding backing to reinforce and then the tower crane unhooks; (2). After the steel column welding is completed, install the steel beam. The connection with the steel column is a full-penetration weld. After backing reinforcement, the tower crane unhooks; (3). Repeat the above installation method until the steel beam installation of the roof layer is completed. The installation process of the steel beams of the N+1th, N+2th, and N+3th layers is the same as the outer frame standard. After the installation of the steel beam of the N+3th layer is completed, immediately complete the laying of the truss slab and concrete pouring to provide a site for the erection of the operation scaffold.

3. The precise installation method for the construction of the super-high-rise tower crown according to claim 1, characterized in that: The process of the second step in construction section 1 is as follows: (1). Lift and install the first column of WD1, temporarily fix the steel column, and after calibration, use welding backing to reinforce and then the tower crane unhooks; (2). After the steel column welding is completed, continue to install the steel beam upward. The connection with the steel column is a full-penetration weld. After backing reinforcement, the tower crane unhooks; (3). Install the steel staircase and the steel components of the pipe shaft. The steel structure staircase is assembled on the ground and then hoisted as a whole. After the steel components of the shaft and the steel staircase are welded, it can be used as the north-side construction up-and-down passage during the tower crown installation process; (4). Repeat the above installation process until the hoisting of the outer frame steel beam of the window-washing machine platform layer is completed; (5). Lift and install the upper chord of the long-span truss of the window-washing machine platform layer. This part of the components is hoisted in sections. After the hoisting is completed, immediately complete the welding to form a stable structure of the steel column, steel beam, and truss upper chord; (6). Set a braided safety net at the 356m elevation. After the net is fixed firmly, conduct the "high-drop test" as required. After the test result is qualified, lift and install the lower chord of the long-span truss. Before the lower chord is hoisted, set a standardized walkway board on one side of the truss. The lower chord of the truss can be unhooked only after the welding is completed.

4. The precise installation method for the construction of the super high-rise crown according to claim 1, characterized in that: The process of construction section 2 is as follows: (1). Complete the hoisting of the steel beam of the water tank layer, and pre-store the water tank components above the steel beam of the water tank layer after the steel beam welding is completed; (2). Continue to install upward to complete the steel beam of the window-washing machine layer, and thus complete the installation of stage two.

5. The precise installation method for the construction of the super high-rise crown according to claim 1, characterized in that: The process of construction section 3 is divided into the first step and the second step, and the process of the first step in construction section 3 is as follows: (1). Lift and install the outer frame column of the helipad layer. Set a standardized steel climbing ladder with a cage before the steel column is hoisted; (2). Adopt the inverted installation method. First, install the outermost outer frame beam of the helipad, and then install the intermediate layer outer frame beam; (3). Set up a falsework on the window-washing machine layer to support the cross-shaped steel beam of the helipad; (4). Install the pin shaft and cable of the cross-shaped beam. After calibration, carry out welding. After the backing weld is completed, the tower crane can unhook. (5). Install the steel beams and pin shafts corresponding to the pin shafts at the four corners of the helipad from east, west, south, and north. After calibration, carry out welding and install the remaining floor beams of the helipad. (6). Install the steel staircase, remove the support falsework, and complete the installation of the steel structure crown.

6. The precise installation method for the construction of the super high-rise tower crown according to claim 1, characterized in that: (2). The process of step two in the construction section 3 is as follows: (1). Assemble the upper structure of the helipad on the window cleaning machine platform layer, complete welding and related reinforcement work. (2). Set up lifting brackets. There are 4 lifting brackets, and the height of the lifting brackets does not exceed the aviation height limit requirement of 374m. (3). Complete the preparatory work before lifting. After lifting 50mm, let it stand for 24h. After 24h, check whether the lifting system and the structure to be lifted meet the requirements. After checking that the structure is qualified, lift the entire helipad structure to the design elevation. (4). After standing for 24h at the design elevation, install the inserted steel columns and remove the lifting system to complete the installation of the steel structure crown.

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