Large venue arc-shaped cantilever structure construction method based on BIM (Building Information Modeling) technology

Abstract

The invention relates to a large venue arc-shaped cantilever structure construction method based on a BIM technology. The method is characterized in that a construction drawing is deeply designed through the BIM technology, and a three-dimensional model is generated to guide construction; positioning points are determined based on field axes in the control point setting stage, and the error between the axes is controlled to be smaller than or equal to 2 mm; systematized erecting operation is carried out in the formwork erecting stage; in the reinforcing steel bar binding stage, a tower crane is used for being matched with the whole beam to fall to a formwork; in the special-shaped template arrangement stage, a special-shaped structure is segmented through BIM, and a special-shaped bottom die is customized; in the formwork installation stage, early-stage BIM paying-off is combined, and the shape, size and position of a component are controlled; layered and segmented pouring is performed during concrete pouring, intermittent time is controlled, and a specially-assigned person is arranged to observe deformation of the formwork and the steel bars. According to the method, the BIM technology is comprehensively introduced and deeply applied, the characteristics of visualization, parameterization, simulation optimization and the like of the BIM technology are fully utilized, fine management and quality control of the construction process are achieved, and the construction efficiency and the project quality are remarkably improved.

Description

Technical Field

[0001] The present invention relates to building construction technology, in particular to the construction technology of the modeling structure of large public venues, and specifically to a construction method of the curved cantilever structure of a large venue based on BIM technology. Background Art

[0002] In the field of construction engineering, especially in the construction of large venues, curved cantilever structures are widely used due to their unique shape and space utilization advantages. However, traditional construction technology for curved cantilever structures in large venues has problems such as inaccurate dimensions and unnatural shapes during implementation.

[0003] Specifically: First, current construction technology lacks comprehensive positioning and control measures. Due to the complexity and diversity of curved cantilever structures, positioning and control during construction are challenging. Construction drawings often only provide basic positioning of arc length and curvature for each arc segment, lacking detailed and precise control point information. This makes it difficult for construction workers to accurately determine the position and dimensions of the structure during construction, leading to large cumulative errors, high rework rates, and poor molding results.

[0004] Secondly, formwork positioning and shape are difficult to effectively control. In traditional construction, formwork installation and adjustment rely primarily on the experience and manual work of on-site construction technicians. This approach is not only inefficient but also difficult to ensure accurate formwork positioning and shape precision. Formwork fabrication and installation are particularly complex for unusual structures such as curved cantilevers, and even the slightest mistake can lead to structural deformation or dimensional deviation.

[0005] Furthermore, current construction technology lacks effective data management and handover mechanisms. During the construction process, data exchange and handover between various steps often rely on paper documents or verbal communication. This approach is not only prone to errors or omissions in information transmission, but also difficult to trace and verify. Effective data management and handover mechanisms are particularly important for complex projects such as large-scale venue construction, which involve multiple disciplines and processes. Summary of the Invention

[0006] The present invention aims to overcome these shortcomings by proposing a construction method for large-scale curved cantilever structures based on BIM technology. BIM technology is used to refine the design of construction drawings, accurately set control point information, and improve positioning and control accuracy during construction. Simultaneously, the BIM model is used to refine the layout and provide processing guidance for formwork, ensuring the accuracy of formwork positioning and shape. Furthermore, data sharing and exchange are achieved through the BIM platform, improving the efficiency and accuracy of information transmission during construction.

[0007] In order to achieve the above object, the present invention is achieved as follows: A construction method for a large-scale curved cantilever structure based on BIM technology includes the following steps: measuring and setting out lines, accurately setting control points through BIM technology; erecting formwork to ensure the stability of the construction platform; tying steel bars to form the structural skeleton; formwork engineering, installing and adjusting the formwork to the precise position; concrete pouring construction, layering and segmenting to ensure quality; and formwork removal, which is carried out in an orderly manner to ensure structural safety. During the above construction process, During the surveying and setting out phase, we further designed the layout of control points and used BIM technology to further design the construction drawings. We set control points at 500mm intervals in each arc segment, marked the distance and coordinates between the control points and the axis, and generated a 3D model to guide construction. During the control point setting phase, precise positioning and error control are performed. At least two positioning points are determined based on the on-site axis, and accuracy is ensured through repeated measurements. A level is used to determine the horizontal position, and a steel wire is tightened to form a horizontal line. The error between each axis is controlled to ≤2mm. During the formwork erection phase, a systematic erection operation is implemented, with adjustable bases, vertical poles, horizontal poles, and diagonal poles erected layer by layer in the order of the adjustable base, vertical poles, horizontal poles, and diagonal poles, and the elevation is adjusted in coordination with the formwork construction. After the erection is completed, a joint technical, safety, and construction acceptance is carried out. During the reinforcement binding stage, after the stirrups in the core area of the beam-column joint are welded and fixed, the primary and secondary beams are overhead-bound in the short and long span directions; a tower crane is used to coordinate the overall lowering of the beams to the formwork; During the layout of special-shaped templates, we use BIM to segment special-shaped structures, calculate the arc midpoint, edge points and chord center distance, and customize the special-shaped bottom template; During the template installation phase, the shape, size and position of components are controlled in combination with the early BIM layout; Set up monitoring links during the concrete pouring stage, pour in layers and sections, control the interval time, and assign special personnel to observe the deformation of formwork and steel bars; During the formwork removal stage: remove the formwork in sequence according to the concrete strength, and remove the support frame in sections from top to bottom.

[0008] The aforementioned large-scale venue curved cantilever structure construction method based on BIM technology refers to an integrated BIM platform that is used to achieve data sharing, dynamic comparison of 3D models, and optimization of construction parameters to ensure construction accuracy and efficiency. It specifically includes the following modules: 1) 3D modeling and detailed design module, used to automatically generate basic models by importing construction drawings, arrange 500mm interval control points for the curved cantilever structure through parametric modeling, and automatically calculate the distance and coordinates between the control points and the axis; 2) Construction simulation and optimization engine, which performs 4D (three-dimensional + time) simulation of the construction process to predict process conflicts and load changes; 3) IoT data integration hub, which receives real-time data from sensors, including pole tilt sensors and concrete density monitors; 4) Dynamic verification and error control module compares measured data with the BIM model and automatically corrects construction deviations.

[0009] 5) Collaborative management interface provides a visual operation platform for technical, safety and construction personnel; 6) Construction parameter optimization system dynamically adjusts the construction plan based on real-time monitoring data.

[0010] The above-mentioned construction method of the curved cantilever structure of a large venue based on BIM technology, during the process of measuring and laying out and accurately setting control points through BIM technology, presets a two-way verification mechanism between the control point coordinates and the on-site measurement data in the BIM model. When the measured error exceeds the preset threshold, the model adjustment instruction is automatically triggered.

[0011] In the above-mentioned construction method of the curved cantilever structure of a large venue based on BIM technology, during the control point setting stage, the error between each positioning axis is absorbed within the axis through the chord-center distance correction algorithm, and the error sharing value between grids is ≤1.5mm.

[0012] In the above-mentioned construction method of the curved cantilever structure of a large venue based on BIM technology, during the arrangement stage of the special-shaped template, the processing of the special-shaped bottom template includes the step of setting up a laser positioning fixture in the woodworking processing shed, so that the sawing angle can be automatically adjusted based on the chord center distance parameters output by BIM to ensure the accuracy of the curvature of the external angle.

[0013] The above-mentioned large-scale venue curved cantilever structure construction method based on BIM technology uses ultrasonic sensors to monitor the concrete density in real time during the concrete pouring stage and the concrete is poured in layers. The vibration trajectory is preset in combination with the BIM model to ensure that there are no missed vibration areas.

[0014] In the above-mentioned large-scale venue curved cantilever structure construction method based on BIM technology, during the reinforcement binding stage, the stirrups in the core area of the beam-column node are hoisted as a whole using a prefabricated stirrup cage process, and the lifting point positions are determined through BIM simulation.

[0015] The above-mentioned construction method of the curved cantilever structure of a large venue based on BIM technology also integrates an Internet of Things module in the BIM platform, thereby realizing real-time monitoring of the verticality of the formwork support poles and automatically warning of excessive tilt. During the concrete pouring process, the load distribution is dynamically updated through the BIM model to guide the adjustment of the support system.

[0016] The above-mentioned large-scale venue arc cantilever structure construction method based on BIM technology is in the BIM platform 1) The 3D modeling and detailed design module uses NURBS surface algorithms to fit special-shaped structures, integrates AutoCAD / Revit plug-ins to achieve linked modification of drawings, and outputs control point drawings with QR code identification for on-site verification; 2) The construction simulation and optimization engine simulates formwork deformation based on finite element analysis (FEA); optimizes support frame spacing and pole selection through genetic algorithms; and generates a layered and segmented scheme for concrete pouring. 3) The IoT data integration hub uses the MQTT protocol to achieve device communication; establishes a construction parameter database to store historical project data for machine learning optimization; and has a threshold warning system. 4) The dynamic calibration and error control module uses a chord-center distance correction algorithm to achieve error absorption within the axis; integrates laser scanning data and model deviation analysis functions; and generates error distribution heat maps to guide on-site adjustments; 5) The collaborative management interface supports access from multiple terminals including PC / tablet / AR glasses; integrates BIM model marking function and construction log system; and provides 3D animation of the template removal sequence.

[0017] 6) The construction parameter optimization system uses neural networks to predict the initial setting time of concrete; automatically optimizes the movement path of the vibrator; and generates a secondary deepening plan for the template reinforcement nodes.

[0018] The BIM-based construction method proposed in this invention focuses on the construction of curved cantilever structures in large venues. Its characteristic lies in the comprehensive introduction and in-depth application of BIM technology. First, through the in-depth design module of the BIM platform, the present invention can accurately set control points, lay out each arc segment at intervals of 500mm, and automatically generate a three-dimensional model to guide construction, thereby solving the problem of imperfect positioning and control measures in traditional construction. Secondly, the present invention adopts a systematic formwork erection method, erecting it layer by layer in the order of adjustable base, vertical poles, horizontal poles, and diagonal poles, and closely coordinating with the formwork construction to ensure the stability of the construction platform and the accuracy of the structural skeleton. During the steel bar binding stage, the present invention innovatively uses a prefabricated hoist cage integral lifting process, and determines the lifting point position through BIM simulation, further improving construction efficiency. In addition, the present invention also uses the BIM model to accurately arrange and guide the processing of special-shaped formwork, ensuring accurate formwork position and high shaping accuracy. During the concrete pouring process, the present invention sets up a monitoring link, adopts a layered and segmented pouring method, and combines the BIM model to preset the vibration trajectory to ensure the concrete density without missed vibration areas. Finally, during the formwork removal phase, the present invention removes the formwork in order of concrete strength, removing the support frame in sections from top to bottom to ensure structural safety. This entire technical solution fully leverages the visualization, parameterization, and simulation optimization capabilities of BIM technology, enabling refined management and quality control of the construction process, significantly improving construction efficiency and project quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram for marking special-shaped structures at 500mm intervals during the drawing deepening process.

[0020] Figure 2 This is a schematic diagram of using BIM technology to model and arrange beam templates during the drawing deepening process.

[0021] Figure 3 This is a schematic diagram of reinforcing special-shaped formwork during the formwork erection process. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0023] like Figures 1 to 3 As shown in the figure, a construction method for a large-scale venue curved cantilever structure based on BIM technology includes: 1. Measurement and layout 1) Deepening design of construction drawings In the 3D modeling and detailed design module of the BIM platform, construction drawings were imported and the NURBS (Non-Uniform Rational B-Spline) surface algorithm was used to accurately fit the irregularly shaped structure. With its powerful surface modeling capabilities, the NURBS algorithm can handle various complex shapes, such as curved walls and vaults, allowing designers to fine-tune the surface to ensure model accuracy and constructability.

[0024] Through parametric modeling technology, control points are set at intervals of 500mm on the fitted special-shaped structure, and the distances and coordinates between these control points and the axis are automatically calculated.

[0025] Generate a 3D model containing control point information and mark all control points. Simultaneously, using the BIM platform's drawing output function, output a drawing with QR codes identifying the control points for on-site verification. Construction workers can scan the QR codes with smartphones or specialized scanning devices to quickly obtain the precise information and locations of the control points. By comparing these with actual measurement data, they can verify the accuracy of the control points.

[0026] 2) On-site measurement and line setting implementation According to the control point information in the BIM model, accurately find and locate the axis on site and determine at least two positioning points.

[0027] Use a level to repeatedly measure the positioning points to ensure that the positioning is accurate and the error is within the allowable range.

[0028] Pull the steel wire tight between the positioning points to form a horizontal line, and tighten it with a wire tensioner to ensure the horizontality and stability of the steel wire.

[0029] Utilize the dynamic verification and error control module in the BIM platform to compare measured data with the BIM model, automatically correct construction deviations, and ensure construction accuracy.

[0030] The error between each positioning axis is absorbed within the axis through the chord-center distance correction algorithm, and the error sharing value between grids is controlled to ≤1.5mm.

[0031] 2. Formwork erection 1) Setting up the operating platform After surveying and setting out, the construction area operating platform is set up according to construction needs. The specific operation is to build a stable operating platform at the designated location according to the construction plan to provide a safe and convenient working surface for subsequent construction.

[0032] 2) Systematic erection of formwork During the formwork erection process, the BIM platform integrates AutoCAD / Revit plug-ins to enable linked drawing modifications. When design changes occur, simply make the changes in the BIM platform, and the plug-in will automatically synchronize the changes to the AutoCAD or Revit drawings, ensuring the accuracy and consistency of the construction drawings.

[0033] The formwork frame is erected layer by layer in the order of adjustable base, vertical poles, horizontal poles and diagonal poles to ensure the stability and bearing capacity of the formwork frame.

[0034] During the erection process, the construction simulation and optimization engine in the BIM platform is used to perform 4D (three-dimensional + time) simulation to predict process conflicts and load changes, optimize the construction plan, and improve construction efficiency.

[0035] 3. Steel bar binding 1) Fixing stirrups in the core area of beam-column joints First, arrange the column stirrups in the core area of the beam-column joint according to the design spacing in the drawings and the requirements of the specifications, and weld them firmly into shape with Φ10 steel bars.

[0036] 2) Binding of main and secondary beams After fixing all the shaped stirrups, start overhead tying the main beam in the short span direction.

[0037] After the main beams in the short span direction are tied, continue to tie the main beams in the long span direction overhead.

[0038] After all the main beams are tied, start tying the secondary beams overhead.

[0039] During the rebar binding phase, prefabricated hoist cages were used to hoist the stirrups in the core area of the beam-column joint. BIM simulations were used to determine the lifting points, and a tower crane was used to hoist the beams onto the formwork, improving construction efficiency and safety.

[0040] 4. Template Engineering 1) Arrangement and processing of special-shaped templates The special-shaped structure is segmented through the BIM platform, and key parameters such as the arc midpoint, edge point and chord center distance are calculated.

[0041] A laser positioning fixture is set up in the woodworking processing shed, and the sawing angle is automatically adjusted based on the chord-center distance parameters output by BIM to ensure that the accuracy of the sawed special-shaped bottom mold meets the design requirements.

[0042] 2) Template installation and reinforcement Integrate the BIM layout results from the previous phase to control the shape, size, and position of the components and proceed with formwork installation. During installation, ensure that the formwork is securely connected to the formwork support to prevent deformation or displacement.

[0043] During the installation process, the IoT data integration hub within the BIM platform monitors the verticality of the formwork support poles in real time. If any tilt exceeding the standard is detected, adjustments and reinforcements are immediately implemented to ensure the stability of the formwork support poles.

[0044] For beams and slabs with a span of 4m or more, the arch height during formwork construction should be 1 / 1000 to 3 / 1000 of the beam or slab span. During the arching process, precise measurements should be taken using tools such as a level to ensure that the arch height meets the design requirements.

[0045] After the formwork is installed, a comprehensive acceptance and re-inspection is carried out. During the acceptance process, the flatness, verticality, position and reinforcement of the formwork are comprehensively checked to ensure that the quality of the formwork installation meets the design requirements.

[0046] 5. Concrete pouring construction 1) Preparation before pouring Use an air compressor or high-pressure water to clean out debris from the formwork to ensure the quality of the concrete pouring. During the cleaning process, pay attention to check whether the formwork is damaged or leaking, and repair it in time.

[0047] 2) Casting process control The layered and segmented flow construction method is adopted to ensure that each section of concrete can be poured continuously to avoid cold joints. During the pouring process, vibrators are used to fully vibrate the concrete to ensure the density.

[0048] During layered pouring, ultrasonic sensors are used to monitor the concrete density in real time. At the same time, vibration operations are performed based on the vibration trajectory preset in the BIM model to ensure that no areas are missed.

[0049] Before pouring vertical concrete structures, first pour cement mortar with the same mix ratio but without coarse aggregates as a lubricating layer. The pouring thickness and scope of the lubricating layer shall meet the design requirements to ensure smooth concrete pouring.

[0050] Set up a dedicated carpentry team and steel bar team to be responsible for formwork monitoring. During the pouring process, closely observe the formwork, supports, steel bars, etc. Once any abnormality is found, deal with it in a timely manner.

[0051] The vibrating rod is operated in the way of fast insertion and slow extraction, and the insertion points are arranged in a plum blossom shape. During the vibrating process, pay attention to controlling the vibrating time and intensity to avoid over-vibrating or under-vibrating.

[0052] During the pouring process, dynamically update the load distribution information through the BIM model. According to the load change situation, adjust the support system in a timely manner to ensure construction safety and stability.

[0053] VI. Formwork Removal 1). Inspection of formwork removal conditions Before removing the side formwork, check whether the concrete strength has reached 1.2 MPa (specifically determined according to the strength of the formwork removal test blocks). If the requirement is not met, continue to maintain until the conditions are met and then remove.

[0054] 2). Formwork removal sequence and method The formwork is removed in the sequence of first removing the side formwork of the beam, then the bottom formwork of the slab, and finally the bottom formwork of the beam. During the removal process, pay attention to protecting the concrete surface and edges from damage.

[0055] After the formwork is removed, the support frame is also removed from top to bottom in a segmented and piecemeal manner. During the removal process, ensure that the support frame is stable and does not tilt to avoid causing safety accidents.

[0056] To ensure the standardization and safety of the formwork removal operation, use the collaborative management interface of the BIM platform to provide 3D animation disclosure materials for the formwork removal sequence. Construction personnel need to seriously study and master the formwork removal sequence and method before carrying out the operation.

[0057] In the above construction method of the large-scale venue arc-shaped cantilever structure based on BIM technology, the specific formula of the chord center distance correction algorithm mentioned in the on-site measurement and setting-out implementation stage is as follows: In the formula, r is the radius of the circle, l is the length of the chord, d is the measured chord center distance, that is, the uncorrected value, and d 修正 is the corrected chord center distance; the value range of the correction coefficient k is usually 0 < k < 1, and the specific value needs to be determined according to the actual application scenario and experimental data.

[0058] In this embodiment, through the above chord center distance correction algorithm, the following functions are achieved: 1) Error correction and adjustment: The chord-center distance correction algorithm compares the measured value with the theoretical value and uses a correction factor to correct the measured value. This correction process helps to more accurately reflect the actual chord-center distance, thereby absorbing the error within the positioning axis.

[0059] 2) Control error apportionment value: By applying the correction algorithm, we can ensure that the error distribution between grids does not exceed 1.5mm. This is because the algorithm takes into account the source and size of the error during the correction process and adjusts the chord-center distance measurement accordingly to ensure that the error is reasonably distributed within the allowable range.

[0060] 3) Improve positioning accuracy: The application of the chord-center distance correction algorithm helps improve the accuracy of the positioning axis. By correcting and adjusting the chord-center distance, the positioning axis can more accurately reflect the actual position, thus meeting the high-precision requirements in engineering or applications.

[0061] As can be seen from the description of the specific implementation steps above, this invention fully leverages the advantages of BIM technology to achieve refined management and quality control for the construction of curved cantilever structures in large venues. The various modules within the BIM platform collaborate and cooperate with each other, ensuring accurate positioning, proper error control, timely data sharing, effective real-time monitoring, and dynamic optimization and adjustment during the construction process. The implementation of these measures significantly improved construction efficiency and project quality.

[0062] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A construction method for a large-scale venue curved cantilever structure based on BIM technology, including the following steps: surveying and setting out lines, accurately setting control points using BIM technology; erecting formwork to ensure a stable construction platform; tying steel bars to form a structural skeleton; formwork engineering, installing and adjusting formwork to precise positions; concrete pouring, layered and segmented to ensure quality; and orderly formwork removal to ensure structural safety. The method is characterized by: exist During the above construction process, During the surveying and setting out phase, we further designed the layout of control points and used BIM technology to further design the construction drawings. We set control points at 500mm intervals in each arc segment, marked the distance and coordinates between the control points and the axis, and generated a 3D model to guide construction. During the control point setting phase, precise positioning and error control are performed. At least two positioning points are determined based on the on-site axis, and accuracy is ensured through repeated measurements. A level is used to determine the horizontal position, and a steel wire is tightened to form a horizontal line. The error between each axis is controlled to ≤2mm. During the formwork erection phase, a systematic erection operation is implemented, with adjustable bases, vertical poles, horizontal poles, and diagonal poles erected layer by layer in the order of the adjustable base, vertical poles, horizontal poles, and diagonal poles, and the elevation is adjusted in coordination with the formwork construction. After the erection is completed, a joint technical, safety, and construction acceptance is carried out. During the reinforcement binding stage, after the stirrups in the core area of the beam-column joint are welded and fixed, the primary and secondary beams are overhead-bound in the short and long span directions; a tower crane is used to coordinate the overall lowering of the beams to the formwork; During the layout of special-shaped templates, we use BIM to segment special-shaped structures, calculate the arc midpoint, edge points and chord center distance, and customize the special-shaped bottom template; During the template installation phase, the shape, size and position of components are controlled in combination with the early BIM layout; Set up a monitoring link during the concrete pouring stage, pour in layers and sections, control the interval time, and assign a dedicated person to observe the deformation of the formwork and steel bars; During the formwork removal stage: remove the formwork in sequence according to the concrete strength, and remove the support frame in sections from top to bottom.

2. The method for constructing a large-scale curved cantilever structure for a venue based on BIM technology according to claim 1 is characterized by: The BIM technology includes a BIM platform, which is used to achieve data sharing, dynamic comparison of 3D models, and optimization of construction parameters to ensure construction accuracy and efficiency. The BIM platform specifically includes the following modules: 1) 3D modeling and detailed design module, used to automatically generate basic models by importing construction drawings, arrange 500mm interval control points for the curved cantilever structure through parametric modeling, and automatically calculate the distance and coordinates between the control points and the axis; 2) Construction simulation and optimization engine, which performs 4D (three-dimensional + time) simulation of the construction process to predict process conflicts and load changes; 3) IoT data integration hub, which receives real-time data from sensors, including pole tilt sensors and concrete density monitors; 4) Dynamic verification and error control module compares measured data with the BIM model and automatically corrects construction deviations; 5) Collaborative management interface provides a visual operation platform for technical, safety and construction personnel; 6) Construction parameter optimization system dynamically adjusts the construction plan based on real-time monitoring data.

3. The construction method of large-scale venue curved cantilever structure based on BIM technology according to claim 1 is characterized by: During the measurement and layout process, in which control points are precisely set using BIM technology, a two-way verification mechanism between the control point coordinates and the on-site measurement data is preset in the BIM model. When the measured error exceeds the preset threshold, the model adjustment instruction is automatically triggered.

4. The construction method of large-scale venue curved cantilever structure based on BIM technology according to claim 1 is characterized in that: During the control point setting stage, the error between each positioning axis is absorbed within the axis through the chord-center distance correction algorithm, and the error sharing value between grids is ≤1.5mm.

5. The construction method of large-scale venue curved cantilever structure based on BIM technology according to claim 1 is characterized in that: During the special-shaped template arrangement stage, the processing of the special-shaped base template includes the step of setting up a laser positioning fixture in the woodworking processing shed, so that the sawing angle can be automatically adjusted based on the chord center distance parameters output by BIM to ensure the accuracy of the external angle curvature.

6. The method for constructing a large-scale curved cantilever structure for a venue based on BIM technology according to claim 1 is characterized by: During the concrete pouring stage, ultrasonic sensors are used to monitor the density of concrete in real time when pouring in layers, and the vibration trajectory is preset in combination with the BIM model to ensure that there are no missed vibration areas.

7. According to the BIM-based construction method for large-scale venue curved cantilever structures, during the reinforcement binding stage, the stirrups in the core area of the beam-column joint are hoisted integrally using a prefabricated stirrup cage, and the lifting point positions are determined through BIM simulation.

8. The method for constructing a large-scale curved cantilever structure for a venue based on BIM technology according to claim 1 or 2, characterized in that: The BIM platform integrates the Internet of Things module to achieve real-time monitoring of the verticality of the formwork support poles and automatically warn of excessive tilt; During the concrete pouring process, the load distribution is dynamically updated through the BIM model to guide the adjustment of the support system.

9. The construction method of large-scale venue curved cantilever structure based on BIM technology according to claim 2 is characterized by: The BIM platform 1) The 3D modeling and detailed design module uses NURBS surface algorithms to fit special-shaped structures, integrates AutoCAD / Revit plug-ins to achieve linked modification of drawings, and outputs control point drawings with QR code identification for on-site verification; 2) The construction simulation and optimization engine simulates formwork deformation based on finite element analysis (FEA); optimizes support frame spacing and pole selection through genetic algorithms; and generates a layered and segmented scheme for concrete pouring. 3) The IoT data integration hub uses the MQTT protocol to enable device communication; a construction parameter database is established to store historical project data for machine learning optimization; It is equipped with a threshold warning system 4) The dynamic calibration and error control module uses a chord-center distance correction algorithm to achieve error absorption within the axis; integrates laser scanning data and model deviation analysis functions; and generates error distribution heat maps to guide on-site adjustments; 5) The collaborative management interface supports access from multiple terminals, including PCs / tablets / AR glasses; integrates BIM model marking functions with the construction log system; and provides 3D animation instructions for template removal sequence; 6) The construction parameter optimization system uses neural networks to predict the initial setting time of concrete; automatically optimizes the movement path of the vibrator; and generates a secondary deepening plan for the template reinforcement nodes.

10. The method for constructing a large-scale curved cantilever structure for a venue based on BIM technology according to claim 4 is characterized by: The formula of the chord-center distance correction algorithm is: ， Where \(r\) is the radius of the circle, \(l\) is the length of the chord, \(d\) is the measured distance from the center of the circle to the chord (i.e., the uncorrected value), and \(d\) 修正 is the corrected distance from the center of the circle to the chord; the value range of the correction coefficient \(k\) is usually \(0 < k < 1\), and the specific value needs to be determined according to the actual application scenario and experimental data.

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