Integral hoisting construction method for large-span cantilever curtain wall

Abstract

The invention discloses an integral hoisting construction method for a large-span cantilever curtain wall. The integral hoisting construction method for the large-span cantilever curtain wall comprises the following steps that BIM modeling is conducted; designing a hoisting point; analyzing stability; part machining; transporting and assembling the components; integrally hoisting; and checking and accepting quality. According to the integral hoisting construction method for the large-span cantilever curtain wall, integral hoisting of the curtain wall is achieved, the construction efficiency is greatly improved, the construction period is remarkably shortened, the construction precision is powerfully guaranteed, the construction quality is remarkably improved, aloft work is effectively reduced, and the construction safety is practically improved.

Description

Technical Field

[0001] The invention relates to the technical field of curtain wall hoisting, and in particular to an integral hoisting construction method for a large-span cantilevered curtain wall. Background Art

[0002] Large-span cantilever curtain walls have been increasingly widely used in modern buildings. In the prior art, large-span cantilever curtain walls are installed according to the traditional curtain wall installation method, which usually relies on a hanging basket or scaffolding as a construction platform. The erection and dismantling of the hanging basket or scaffolding requires a lot of time and manpower, and the construction process is greatly restricted by space and environment, which affects the construction efficiency and quality.

[0003] Therefore, the prior art proposes an installation method of splitting a large-span cantilever curtain wall and then installing it. Specifically:

[0004] First, the curtain wall structure is decomposed into individual components, which are hoisted and installed one by one. Although this method can complete the construction task to a certain extent, the hoisting and installation of individual components requires frequent adjustment and calibration, resulting in a long construction period, difficulty in ensuring accuracy, and high safety risks during the construction process.

[0005] The second method is to use the method of hoisting and splicing small unit components. Although this method improves the construction efficiency to a certain extent, the connection and splicing between small unit components requires high precision and technical requirements, which is prone to problems such as loose splicing and insufficient flatness, affecting the overall quality and appearance of the curtain wall. Summary of the invention

[0006] The technical problem to be solved by the present invention is that it is difficult to install a large-span cantilever curtain wall, and the purpose is to provide a large-span cantilever curtain wall integral hoisting construction method to solve the above problem.

[0007] The present invention is achieved through the following technical solutions:

[0008] A large-span cantilever curtain wall integral hoisting construction method comprises the following steps:

[0009] BIM modeling: obtain data of constructed structures through on-site measurement; build models through BIM based on the collected data; build curtain wall models based on BIM and simulate installation; obtain processing data and processing parameter forms based on the curtain wall model;

[0010] Design of hoisting points: Obtain the finite element model of the curtain wall; Based on the finite element model of the curtain wall, obtain the center of gravity and stress-bearing parts of the curtain wall model through finite element analysis; Select several hoisting positions based on the center of gravity and stress-bearing parts; Simulate the hoisting process to obtain the deformation of each hoisting position; Select the hoisting position with the smallest deformation as the theoretical hoisting point;

[0011] Stability analysis: Perform calculation and analysis on the hoisting stability and component strength of the theoretical hoisting point; if the analysis is qualified, the theoretical hoisting point is used as the actual hoisting point; if the analysis is unqualified, select the remaining theoretical hoisting points for analysis, or repeat the hoisting point design and stability analysis until the analysis is qualified;

[0012] Component processing: Process components based on the processing data and processing parameter form obtained from BIM modeling;

[0013] Component transportation and assembly;

[0014] Overall lifting: The lifting equipment is connected to the curtain wall through the actual lifting points;

[0015] Quality acceptance.

[0016] In one possible design, the finite element model of the curtain wall is obtained, and the mass parameters, curtain wall shape, curtain wall support structure length, number of support structure frames, single frame spacing, curtain wall panel shape and size are extracted from the curtain wall model established by BIM. The finite element analysis establishes the finite element model of the curtain wall through the parameters, and the finite element model of the curtain wall is used for the design of the lifting point and the stability analysis.

[0017] In one possible design, the stability analysis includes the following steps:

[0018] According to the curtain wall composition and theoretical hoisting point settings, calculate the total number of units, nodes and supports of the curtain wall finite element model;

[0019] According to the constant load condition and live load condition, linear analysis and calculation are carried out respectively to obtain the maximum and minimum displacement of the curtain wall components, strength stress ratio, strength stress of the hoisting point and stability stress ratio;

[0020] Compare the actual calculated values ​​with the qualified values: the maximum and minimum displacements are less than 1 / 250 of the span, the maximum strength-stress ratio is less than 1, and the maximum stability-stress ratio is less than 1.

[0021] In a possible design, in the processing of parts, the supporting structure is divided into multiple units according to the frame. Before batch processing, a trial processing is carried out on one frame, and batch processing is carried out after passing the inspection. When processing the panel, the processing, transportation, and installation direction and sequence are indicated.

[0022] In one possible design, component transportation and assembly include the following steps:

[0023] Transport them to the assembly location on the construction site according to the number and installation sequence;

[0024] Make tire frame;

[0025] Support structure installation: quality inspection; assembly according to the installation sequence; welding; structural retest and weld inspection;

[0026] Panel installation: Install in sequence; adjust the position and flatness of adjacent panels;

[0027] When assembling the supporting structure, the lifting points are aligned and a total station is used for positioning, layout and inspection.

[0028] In one possible design, the overall lifting includes the following steps:

[0029] Select lifting equipment according to the lifting point design, lifting site, lifting weight and lifting height;

[0030] Lifting equipment connects the curtain wall;

[0031] Hoisting;

[0032] Position adjustment and fixing;

[0033] Glue the panel.

[0034] In one possible design, the lifting includes the following steps:

[0035] Preparation for hoisting: compacting the ground; measuring and setting out; briefing personnel, checking equipment and hoisting equipment, and positioning hoisting equipment; measuring and obtaining the connection points between the curtain wall and the constructed structure, and marking the connection points;

[0036] Test hoisting: hoist the curtain wall to 100-120mm above the ground, check the operation of the hoisting equipment, whether the legs of the hoisting equipment sink, whether the hoisting rope is broken, the deformation of the curtain wall and whether the weld is cracked;

[0037] Formal lifting.

[0038] In a possible design, position adjustment and fixation include the following steps:

[0039] The curtain wall is hoisted to the designed installation location;

[0040] Use a total station to re-measure the installation position and hanging points; use additional hanging equipment to make fine adjustments to the mid-span and both ends of the curtain wall;

[0041] Welding: start from the node close to the lifting point and weld and fix symmetrically on both sides, with multiple people working on the side and top surfaces simultaneously; welding point inspection;

[0042] The lifting equipment slowly loosens the hook until the lifting equipment is separated from the curtain wall.

[0043] In one possible design, the panel gluing includes the following steps:

[0044] Preparation for glue injection: tear off the folded edge of the panel protective film and clean the gap between adjacent panels; stick masking tape on the 90° corner folded edge, and the masking tape should be folded 90° at the four corners of the glue seam;

[0045] Glue injection: Fill the foam strips continuously in a straight line, from top to bottom, from left to right, all at once;

[0046] Glue scraping: fill and point the joints simultaneously; wipe off the excess glue with a cleaner;

[0047] Cleaning: Tear off the panel protective film; clean the panel with a neutral detergent; before the glue solidifies, tear off the masking tape at a 45° angle outward.

[0048] In a possible design, during the quality acceptance step, quality acceptance is carried out in accordance with the "Aluminum Alloy Structural Engineering Construction Quality Acceptance Code".

[0049] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0050] 1. Greatly improve construction efficiency and significantly shorten construction period: Through BIM technology and finite element analysis, accurate design and efficient construction process planning are achieved, as well as overall assembly and one-time lifting on the ground frame, which greatly reduces the construction time.

[0051] 2. Effectively guarantee construction accuracy and significantly improve construction quality: Precise technical application and strict control of construction links ensure the high precision and high quality of the curtain wall structure, avoiding the common problems of insufficient precision and quality defects in traditional construction.

[0052] 3. Effectively reduce high-altitude operations and effectively increase construction safety: overall assembly and one-time lifting reduce the time and risk of high-altitude operations and provide a safer working environment for construction workers.

[0053] 4. Significantly reduce the cost of measures and efficiently save resources: Optimized construction processes and technical means reduce the input of manpower and material resources, and achieve effective use of resources and reasonable control of costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0055] Figure 1 The figure is a flow chart of a method for overall hoisting construction of a large-span cantilever curtain wall.

[0056] Figure 2 Schematic diagram of the structure modeled for BIM.

[0057] Figure 3 This is the curtain wall strength stress ratio cloud diagram.

[0058] Figure 4 This is the curtain wall stability stress ratio cloud diagram.

[0059] Figure 5 This is a structural diagram during the curtain wall hoisting process.

[0060] Figure 6 This is a structural diagram of the completed curtain wall hoisting. DETAILED DESCRIPTION

[0061] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0062] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, in order to avoid obscuring the present invention, well-known structures, circuits, materials, or methods are not specifically described.

[0063] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0064] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0065] Example:

[0066] like Figure 1-Figure 6 As shown, a large-span cantilever curtain wall overall hoisting construction method comprises the following steps:

[0067] S100BIM modeling: obtain the data of the constructed structure through on-site measurement; build a model through BIM based on the collected data; build a curtain wall model based on BIM and simulate the installation; obtain processing data and processing parameter forms based on the curtain wall model;

[0068] S200 hoisting point design: obtain the finite element model of the curtain wall; based on the finite element model of the curtain wall, obtain the center of gravity and stress-bearing parts of the curtain wall model through finite element analysis; select several hoisting positions based on the center of gravity and stress-bearing parts; simulate the hoisting process to obtain the deformation of each hoisting position; select the hoisting position with the smallest deformation as the theoretical hoisting point;

[0069] S300 stability analysis: perform calculation and analysis on the hoisting stability and component strength of the theoretical hoisting point; if the analysis is qualified, the theoretical hoisting point is used as the actual hoisting point; if the analysis is unqualified, select the remaining theoretical hoisting points for analysis, or repeat the hoisting point design and stability analysis until the analysis is qualified;

[0070] S400 component processing: Process components based on the processing data and processing parameter form obtained from BIM modeling;

[0071] S500 parts transportation and assembly;

[0072] S600 overall hoisting: the hoisting equipment is connected to the curtain wall through the actual hoisting points;

[0073] S700 quality acceptance.

[0074] In the overall hoisting construction method for the large-span cantilever curtain wall, for S100, a three-dimensional visualization model of the overall installation structure of the curtain wall is established through BIM modeling, and the modeling includes the constructed structure and the curtain wall, so as to simulate the curtain wall installation process, clearly present the complex structure of each component and the relationship between each component, and visualize the installation plan of the curtain wall, which is convenient for construction personnel to intuitively understand and plan the construction process, thereby optimizing the construction process, reducing costs, and saving resources.

[0075] Furthermore, for the constructed structure, its data are derived from on-site measurements, so the model of the constructed structure has good restoration and authenticity. Accordingly, the data of the curtain wall model can also be used for the actual processing of the curtain wall. If there is an installation problem and the data of the curtain wall model needs to be adjusted, the parameters of the curtain wall model can be modified accordingly, and then the simulated installation can be performed. In this way, the accurate design of the curtain wall is achieved, the high precision and high quality of the curtain wall structure are ensured, which helps to improve the construction quality and efficiency, shorten the construction period, and avoid the frequent and multiple production of physical models, which helps to reduce construction costs.

[0076] For S200, based on the curtain wall model obtained by S100, the finite element model of the curtain wall is established through finite element analysis, so as to calculate and determine the optimal position and number of theoretical hoisting points to reduce the deformation and stress concentration of the curtain wall during the hoisting process. At the same time, in conjunction with S300, various possible load conditions and unfavorable factors are considered to analyze the stability of the curtain wall during the hoisting process. According to the analysis results, the hoisting plan is optimized to ensure the safety and reliability of the hoisting process.

[0077] Specifically, 3D3SDesign was selected as the finite element analysis software, and various parameters of the curtain wall model were input to establish the finite element model of the curtain wall; the center of gravity and stress-bearing parts of the curtain wall were determined through the structural analysis function of 3D3SDesign; and the hoisting position was selected near the center of gravity and the main stress-bearing parts to ensure the stability of the curtain wall during the hoisting process.

[0078] The curtain wall is a long-span cantilever curtain wall, which is prone to deformation during the overall hoisting process. Therefore, further simulation is required, that is, the deformation analysis function of 3D3SDesign is used to simulate the deformation of the curtain wall during the hoisting process, so as to select the position with the smallest deformation as the theoretical hoisting point among several hoisting positions to reduce the risk of damage to the curtain wall during the hoisting process.

[0079] Furthermore, for tall curtain walls with a large height, the impact of wind load on the stability of the curtain wall needs to be considered during the hoisting process. The stability analysis function of 3D3SDesign can be used to determine the number of hoisting points required under different wind load conditions. Therefore, during the hoisting operation, the staff can make choices based on the real-time wind conditions. At the same time, 3D3SDesign simulates the situation where the curtain wall swings during the hoisting process. Increasing the number of hoisting points can reduce the swing amplitude of the curtain wall, but it will also increase the construction cost. Therefore, the staff needs to balance stability and cost to determine the optimal number of hoisting points.

[0080] Based on this, several theoretical lifting points that can be used for curtain wall lifting were determined on the curtain wall through S200.

[0081] For S300, based on S200, further calculation and analysis are carried out on the theoretical lifting points, and the overall stability of the curtain wall is analyzed to finally determine the position of the actual lifting points and avoid deformation of the overall components of the curtain wall during the lifting process to ensure the safety of the lifting operation.

[0082] In summary, through the cooperation of S100-S300, with the assistance of BIM technology and finite element analysis, the staff determined the various data of the curtain wall through theoretical calculations, which helped to improve the construction accuracy and better understand the construction process of curtain wall installation, which helped to efficiently plan the construction process. The actual construction can be carried out through S400-S700 later. In addition, the curtain wall was hoisted in one go through the overall hoisting, which helped to reduce the time of high-altitude operations and provided a safer working environment for construction workers.

[0083] In one possible implementation, the finite element model of the curtain wall is obtained, and mass parameters, curtain wall shape, curtain wall support structure length, number of support structure frames, single frame spacing, curtain wall panel shape and size are extracted from the curtain wall model established by BIM. Finite element analysis establishes a finite element model of the curtain wall through the parameters, and the finite element model of the curtain wall is used for the design of lifting points and stability analysis.

[0084] Based on the above design scheme, for various parameters of the curtain wall, it is sufficient to export the data of the curtain wall model established in S100. It is easy to understand that the data required for finite element analysis includes but is not limited to the listed mass parameters, curtain wall shape, curtain wall support structure length, number of frames of the support structure, single frame spacing, curtain wall panel shape and size. Any other suitable type of data can also be imported to improve the accuracy of the curtain wall finite element model.

[0085] In a possible implementation, S300 stability analysis includes the following steps:

[0086] S310 calculates the total number of units, nodes and supports of the curtain wall finite element model according to the curtain wall composition and theoretical hoisting point settings;

[0087] S320 performs linear analysis and calculation according to constant load conditions and live load conditions to obtain the maximum and minimum displacements, strength-stress ratios, strength stresses at the hoisting points, and stability stress ratios of the curtain wall components;

[0088] S330 compares the actual calculated values ​​with the qualified values: the maximum and minimum displacements are less than 1 / 250 of the span, the maximum strength stress ratio is less than 1, and the maximum stability stress ratio is less than 1.

[0089] Based on the above design scheme, the curtain wall is divided into blocks through S310 to prepare for the subsequent finite element analysis. Specific calculations are performed through S320, where the data required for the calculations are derived from the curtain wall model in S100. In S330, the actual calculated value is compared with the qualified value to determine whether the stability of the curtain wall is qualified. If one indicator does not meet the requirements, it means that the theoretical lifting point is not suitable for actual lifting.

[0090] For example, if the overall skeleton of the curtain wall is a horizontal right-angled triangular prism, the length direction of the triangular prism skeleton is divided into 14 frames, and the spacing between each frame is 2.6m. According to the finite element simulation analysis and calculation, a total of 4 hoisting points are designed for the overall hoisting, and a single hoisting device has 2 hoisting points. The hoisting point is arranged on the fourth frame from the end of the skeleton and at the 1 / 4 span position. The hoisting point divides the component into three-span continuous structures along the length direction, effectively reducing the bending moment of the component. During hoisting, the lifting rope is fixed to the transverse keel at the lifting point position, and the welded angle steel rope groove prevents the lifting rope from sliding. Further, the curtain wall finite element model establishes a total of 1060 units, a total of 606 nodes and 4 supports. The maximum vertical displacement of the overall hoisting component is 26.4mm at the mid-span position, which meets the requirements. The maximum strength stress ratio is 0.939<1, which meets the hoisting strength requirements, and the maximum stability stress ratio is 0.813<1, which meets the hoisting stability requirements.

[0091] After the curtain wall is prefabricated and installed, it is a frame body with a length of 33.5m and a width of 6.8m. The mass parameters are extracted from the BIM three-dimensional model, and the overall mass is 29.57t. Due to the large size and weight of the components and the hoisting installation height of 23m, there are few lifting points when a single lifting equipment is used, the stress of the lifting points is concentrated, the components are easy to deform, and a larger lifting equipment is required. Taking all the above factors into consideration, two 100t truck cranes are selected for lifting construction.

[0092] In a possible implementation, during the processing of S400 components, the supporting structure is divided into multiple units according to the frame, and a trial processing is carried out on one frame before batch processing, and batch processing is carried out after passing the inspection; during panel processing, the processing, transportation, and installation direction and sequence are indicated.

[0093] Based on the above design, the curtain wall includes support structure and panel, which are processed separately. Considering that the curtain wall is a long-span cantilever curtain wall, the support structure and panel are also divided into several units and processed separately to reduce the difficulty of processing. The processing data and processing parameter form obtained in S100 are used as the basis for cutting to ensure accurate cutting and processing.

[0094] Specifically, the supporting structure is divided into multiple units according to the frame. Before processing, one unit should be processed for trial to ensure the processing accuracy. During processing, attention should be paid to the precise cutting angle, the burrs on the cut end face should be cleaned up, and random inspections should be carried out to ensure quality.

[0095] The panels can be produced by the corresponding processing plants according to the specific requirements, and each panel is numbered, indicating the direction and sequence of processing, transportation and installation to ensure the efficiency of subsequent processing and assembly. During processing and transportation, the surface of the panel should be protected to prevent scratches.

[0096] Optionally, in order to reduce the workload of on-site processing and welding, the processed curtain wall is connected to each unit by welding or other connection methods in the processing plant to form a supporting structure.

[0097] In a possible implementation, the transportation and assembly of S500 components includes the following steps:

[0098] S510 is transported to the assembly location on the construction site according to the number and installation sequence;

[0099] S520 makes tire frame;

[0100] S530 support structure installation: quality inspection; assembly according to the installation sequence; welding; structural retest and weld inspection;

[0101] S540 panel installation: Install in order; adjust the position and flatness of adjacent panels;

[0102] When assembling the supporting structure, the lifting points are aligned and a total station is used for positioning, layout and inspection.

[0103] Based on the above design scheme, in S510, any suitable existing transportation equipment is selected for transportation. During transportation, attention is paid to protecting each component, especially the surface of the panel; when placing the components, attention is paid to the numbering and order to ensure that the curtain wall structure conforms to the design, which also helps to speed up the subsequent assembly. In S520, the tire frame provides support and positioning for the assembly of the curtain wall to ensure the accuracy and stability of the curtain wall assembly process. It is easy to understand that the tire frame can be made of any suitable material to make any suitable structure.

[0104] In S530, the support structure is installed by welding. If the welding is completed in the processing plant, the support structure only needs to be placed on the tire frame. The quality inspection mainly covers: whether the keel is damaged; whether the punching is done as required; whether all the punching edges are deformed; whether there are burrs, etc. If such conditions are found, they need to be cleaned before organizing the installation.

[0105] In S540, each panel is fixed on the supporting structure. The staff uses the grid diagram as a guide and selects any suitable fixing nails such as self-drilling nails to fix the panel at the designed position. The relative position of adjacent panels is adjusted to ensure the flatness and joint spacing of the two adjacent panels.

[0106] Optionally, the tire frame is made of rectangular square tubes, and a support platform is welded at the bottom. The platform is flat and has a rigidity that meets the requirements and does not deform after bearing pressure. If the curtain wall support structure is an inverted triangular section, the tire frame uses square tubes as support columns on the unsupported side of the support structure.

[0107] In a possible implementation, the overall hoisting of S600 includes the following steps:

[0108] S610 selects the lifting equipment according to the lifting point design, lifting site, lifting weight and lifting height;

[0109] S620 lifting equipment connects the curtain wall;

[0110] S630 hoisting;

[0111] S640 position adjustment and fixation;

[0112] S650 panel gluing.

[0113] Based on the above design scheme, in S610, the appropriate lifting equipment is selected by comprehensively considering the lifting site, lifting weight, lifting height, lifting point of the curtain wall, and deformation of the curtain wall. The lifting point design analyzes the lifting point of the curtain wall and the deformation of the curtain wall, and the staff can refer to the analysis results. The site of the lifting position should be open and flat to meet the use requirements of various lifting equipment. In S620, the lifting equipment is connected to the curtain wall through any suitable type of lifting rope, and the connection point between the lifting rope and the curtain wall is the actual lifting point determined by S300.

[0114] In S630, the lifting is carried out by lifting equipment. If multiple lifting equipment are used for lifting at the same time, attention should be paid to the synchronization between the multiple lifting equipment to ensure the safety of the lifting. In S640, the position of the curtain wall after lifting is fine-tuned to ensure that the curtain wall is in the designed installation position as much as possible; then fix it, that is, connect the curtain wall to the constructed structure. In S650, the sealing and fixation between each panel is achieved by gluing to prevent the intrusion of external impurities, protect the panel and extend its service life. At the same time, it also increases the overall stability of the panel, making the panel more firmly fixed in the predetermined position.

[0115] In a possible implementation, the S630 hoisting includes the following steps:

[0116] S631 Hoisting preparation: ground compaction; measurement and layout; personnel briefing, equipment and hoisting equipment inspection, and hoisting equipment placement; measurement and acquisition of the connection points between the curtain wall and the constructed structure, and marking of the connection points;

[0117] S632 trial hoisting: hoist the curtain wall to 100-120mm above the ground, check the operation of the hoisting equipment, whether the legs of the hoisting equipment sink, whether the hoisting rope is broken, the deformation of the curtain wall and whether the weld is cracked;

[0118] S633 was officially hoisted.

[0119] Based on the above design scheme, in S631, the ground is compacted to prevent settlement, especially at the outriggers of the lifting equipment. If necessary, pads are placed under the outriggers to improve the safety of the lifting. By marking the connection points, the accuracy and efficiency of fixing the curtain wall in S640 are improved. In S632, the construction safety is ensured by trial lifting. In S633, after checking that there are no safety hazards, multiple lifting equipment are synchronously commanded to rise slowly, so that the curtain wall gradually reaches the designed installation position.

[0120] In a possible implementation, S640 position adjustment and fixing includes the following steps:

[0121] S641 curtain wall is hoisted to the designed installation position;

[0122] S642 uses a total station to re-measure the installation position and hanging points; additional hanging equipment is used to make fine adjustments to the mid-span and both ends of the curtain wall;

[0123] S643 welding: start from the node close to the lifting point and weld and fix on both sides symmetrically, with multiple people working on the side and top simultaneously; welding point inspection;

[0124] S644 lifting equipment slowly loosens the hook until the lifting equipment is separated from the curtain wall.

[0125] Based on the above design scheme, in S641, the curtain wall remains stable after reaching the designed installation position, so as to facilitate S642, thereby facilitating fine-tuning of the curtain wall position and eliminating hoisting deflection deformation. In S643, the curtain wall is connected to the constructed structure by welding, and multiple people are working at the same time to improve welding efficiency, reduce the time of high-altitude operations, and make construction safer. In S644, after all the connection points are welded, the welding points are checked. After the inspection is correct, the hook is slowly released to achieve the separation of the hoisting equipment from the curtain wall.

[0126] In a possible implementation, gluing the S650 panel includes the following steps:

[0127] S651 glue injection preparation: tear off the folded edge of the panel protective film and clean the gap between adjacent panels; paste masking tape on the 90° corner folded edge, and the masking tape should be folded 90° at the four corners of the glue seam;

[0128] S652 glue injection: The foam strips are filled continuously in a straight line, from top to bottom, from left to right, all at once;

[0129] S653 glue scraper: fill and point at the same time; wipe off the excess glue with a cleaner;

[0130] S654 cleaning: Tear off the panel protective film; clean the panel with a neutral detergent; before the glue solidifies, tear off the masking tape at a 45° angle outward.

[0131] Based on the above design scheme, when S650 is working, workers are hoisted to the bottom or side of the panel with aerial work equipment such as a straight arm trolley, and they wear safety belts to ensure their safety. In S651, the masking tape should be pasted in place at one time and smoothed with force to avoid wrinkling of the masking tape. In S652, the glue should be connected tightly, and the seam glue should be smooth and full during the glue application process. The thickness of the glue should not be too thin or too thick. The surface of the glue should be flat and smooth, and the glass should be clean and free of dirt. The top, edge and bottom sealing should be firm, beautiful and waterproof, and the water from the top should be drained inward. In S653, the joints are pointed to make the glue surface after forming an arc-shaped concave surface and uniform without flow. It should be noted that the scraping speed at the corners is slightly slow. If silicone buildings are being processed, the sealant should be bonded to two sides in the joint, not three sides. In S654, the torn masking tape is centrally processed to avoid environmental pollution.

[0132] In a possible implementation, during the quality acceptance of step S700, quality acceptance is conducted in accordance with the "Aluminum Alloy Structure Engineering Construction Quality Acceptance Code". Based on the above design scheme, it is ensured that the construction quality is fully qualified and the proportion of excellent processes is high.

[0133] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for overall hoisting construction of a large-span cantilever curtain wall, characterized in that: The following steps are involved: BIM modeling: obtain data of constructed structures through on-site measurement; build models through BIM based on the collected data; build curtain wall models based on BIM and simulate installation; obtain processing data and processing parameter forms based on the curtain wall model; Design of lifting points: Obtain the finite element model of the curtain wall; Based on the finite element model of the curtain wall, obtain the center of gravity position and stress-bearing parts of the curtain wall model through finite element analysis; Select several lifting positions based on the center of gravity position and stress-bearing parts; Simulate the hoisting process to obtain the deformation of each hoisting position; select the hoisting position with the smallest deformation as the theoretical hoisting point; Stability analysis: Calculate and analyze the hoisting stability and component strength of the theoretical hoisting point; if the analysis is qualified, the theoretical hoisting point will be used as the actual hoisting point; If the analysis fails, select other theoretical lifting points for analysis, or repeat the lifting point design and stability analysis until the analysis passes; Component processing: Process components based on the processing data and processing parameter form obtained from BIM modeling; Component transportation and assembly; Overall lifting: The lifting equipment is connected to the curtain wall through the actual lifting points; Quality acceptance.

2. The overall hoisting construction method for a large-span cantilevered curtain wall according to claim 1 is characterized in that: The finite element model of the curtain wall is obtained, and the mass parameters, curtain wall shape, curtain wall support structure length, number of support structure frames, single frame spacing, curtain wall panel shape and size are extracted from the curtain wall model established by BIM. The finite element analysis establishes the finite element model of the curtain wall through the above parameters. The finite element model of the curtain wall is used for the design of the lifting point and the stability analysis.

3. The overall hoisting construction method for a large-span cantilevered curtain wall according to claim 2 is characterized in that: Stability analysis includes the following steps: According to the curtain wall composition and theoretical hoisting point settings, calculate the total number of units, nodes and supports of the curtain wall finite element model; According to the constant load condition and live load condition, linear analysis and calculation are carried out respectively to obtain the maximum and minimum displacement of the curtain wall components, strength stress ratio, strength stress of the hoisting point and stability stress ratio; Compare the actual calculated values ​​with the qualified values: the maximum and minimum displacements are less than 1 / 250 of the span, the maximum strength-stress ratio is less than 1, and the maximum stability-stress ratio is less than 1.

4. The method for overall hoisting construction of a large-span cantilevered curtain wall according to claim 3 is characterized in that: In the processing of parts, the supporting structure is divided into multiple units according to the frame. Before batch processing, a trial processing is carried out on one frame, and batch processing is carried out after passing the inspection. When processing the panel, the processing, transportation, installation direction and sequence must be indicated.

5. The method for overall hoisting construction of a large-span cantilevered curtain wall according to claim 4 is characterized in that: Component transportation and assembly includes the following steps: Transport them to the assembly location on the construction site according to the number and installation sequence; Make tire frame; Support structure installation: quality inspection; assembly according to the installation sequence; welding; structural retest and weld inspection; Panel installation: Install in sequence; adjust the position and flatness of adjacent panels; When assembling the supporting structure, the lifting points are aligned and a total station is used for positioning, layout and inspection.

6. The method for overall hoisting construction of a large-span cantilevered curtain wall according to claim 5 is characterized in that: The overall lifting includes the following steps: Select lifting equipment according to the lifting point design, lifting site, lifting weight and lifting height; Lifting equipment connects the curtain wall; Hoisting; Position adjustment and fixing; Glue the panel.

7. The method for overall hoisting construction of a large-span cantilevered curtain wall according to claim 6 is characterized in that: Lifting includes the following steps: Preparation for hoisting: compacting the ground; measuring and setting out; briefing personnel, checking equipment and hoisting equipment, and positioning hoisting equipment; measuring and obtaining the connection points between the curtain wall and the constructed structure, and marking the connection points; Test hoisting: hoist the curtain wall to 100-120mm above the ground, check the operation of the hoisting equipment, whether the legs of the hoisting equipment sink, whether the hoisting rope is broken, the deformation of the curtain wall and whether the weld is cracked; Formal lifting.

8. The method for overall hoisting construction of a large-span cantilevered curtain wall according to claim 6 is characterized in that: Position adjustment and fixing include the following steps: The curtain wall is hoisted to the designed installation location; Use a total station to re-measure the installation position and hanging points; use additional hanging equipment to make fine adjustments to the mid-span and both ends of the curtain wall; Welding: start from the node close to the lifting point and weld and fix symmetrically on both sides, with multiple people working on the side and top surfaces simultaneously; welding point inspection; The lifting equipment slowly loosens the hook until the lifting equipment is separated from the curtain wall.

9. The method for overall hoisting construction of a large-span cantilevered curtain wall according to claim 6, characterized in that: Panel gluing includes the following steps: Preparation for glue injection: tear off the folded edge of the panel protective film and clean the gap between adjacent panels; stick masking tape on the 90° corner folded edge, and the masking tape should be folded 90° at the four corners of the glue seam; Glue injection: Fill the foam strips continuously in a straight line, from top to bottom, from left to right, all at once; Glue scraping: fill and point the joints simultaneously; wipe off the excess glue with a cleaner; Cleaning: Tear off the panel protective film; clean the panel with a neutral detergent; before the glue solidifies, tear off the masking tape at a 45° angle outward.

10. The method for integrally hoisting a large-span cantilever curtain wall according to any one of claims 1 to 9, characterized in that: During the quality acceptance of the steps, quality acceptance shall be carried out in accordance with the "Aluminum Alloy Structural Engineering Construction Quality Acceptance Code".

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