Construction method of large-scale arc cantilever structure based on BIM technology

Abstract

The application is a large venue arc cantilever structure construction method based on BIM technology, characterized by: deepening design of construction drawings and generating a three-dimensional model to guide construction through BIM technology; positioning points are determined based on the field axis in the control point setting stage, and the error between the axes is controlled to be less than or equal to 2mm; systematized erection operation is implemented in the formwork support erection stage; in the steel bar binding stage, the tower crane is used to cooperate with the whole beam to the formwork; in the special-shaped formwork arrangement stage, the BIM is used to segment the special-shaped structure, and the special-shaped base mold is customized; in the formwork installation stage, the component shape, size and position are controlled in combination with the BIM pre-period line laying; when pouring concrete, it is poured in layers and sections and the intermittent time is controlled, and special personnel are arranged to observe the formwork and steel deformation. The application fully introduces and deeply applies the BIM technology, fully utilizes the characteristics of the BIM technology such as visualization, parameterization, simulation optimization, realizes the fine management and quality control of the construction process, and significantly improves the construction efficiency and engineering quality.

Description

Technical Field

[0001] This invention relates to building construction technology, and more particularly to the construction technology of the shape structure of large public venues, specifically a construction method for the curved cantilever structure of large venues based on BIM technology. Background Technology

[0002] In the field of architectural 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 techniques for curved cantilever structures in large venues suffer from problems such as inaccurate dimensions and unnatural shapes during implementation.

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

[0004] Secondly, the position and shape of the formwork are difficult to control effectively. In traditional construction, the installation and adjustment of formwork mainly rely on the experience of on-site construction technicians and manual operation. This method is not only inefficient, but also makes it difficult to guarantee the accuracy of the formwork position and the precision of the shape. Especially for irregular structures such as curved cantilever structures, the fabrication and installation of formwork are more complex, and the slightest carelessness can lead to structural deformation or dimensional deviations.

[0005] Furthermore, current construction techniques lack effective data management and handover mechanisms. During construction, data exchange and handover between different processes often rely on paper documents or verbal communication. This method 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 crucial for complex projects like large-scale stadium construction, which involve multiple disciplines and processes. Summary of the Invention

[0006] The purpose of this invention is to overcome the aforementioned shortcomings and propose a construction method for large-scale stadium curved cantilever structures based on BIM technology. By using BIM technology to refine the construction drawings and precisely set control point information, the positioning and control accuracy during construction is improved. Simultaneously, the BIM model is used to refine the layout and provide processing guidance for the formwork, ensuring the accuracy of the formwork's position and shape. Furthermore, data sharing and exchange are achieved through the BIM platform, improving the efficiency and accuracy of information transmission during construction.

[0007] To achieve the above objectives, the present invention is implemented as follows: A construction method for a large-scale stadium's curved cantilever structure based on BIM technology includes the following steps: surveying and setting out, precisely establishing control points using BIM technology; erecting formwork to ensure the stability of the construction platform; tying reinforcing steel to form the structural framework; formwork engineering, installing and adjusting the formwork to precise positions; concrete pouring, ensuring quality through layered and segmented pouring; and orderly formwork removal to guarantee structural safety. During the above construction process... During the surveying and setting-out stage, the layout of design control points is refined. BIM technology is used to refine the design of construction drawings. Control points are set at 500mm intervals in each arc segment, and the distance and coordinates of the control points to the axis are marked. A three-dimensional model is generated to guide construction. During the control point setting phase, precise positioning and error control are carried out. 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 stretched to form a horizontal line, controlling the error between each axis to be ≤2mm. During the formwork erection phase, a systematic erection operation is implemented, with adjustable bases, uprights, horizontal bars, and diagonal bars erected layer by layer in sequence, and the elevation is adjusted in coordination with the formwork construction; after the erection is completed, a joint technical, safety, and construction acceptance inspection 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 main and secondary beams are bound in the air in the short span and long span directions; the tower crane is used to lower the beams as a whole to the formwork. In the irregular template layout stage; through BIM segmentation of irregular structures, calculate the midpoint, edge point and chord center distance of arc segments, and customize the irregular bottom mold; During the formwork installation phase, the shape, size, and position of components are controlled by combining the previous BIM layout. Monitoring should be implemented during the concrete pouring stage. Pouring should be done in layers and sections, with intervals controlled, and designated personnel should be assigned to observe the deformation of the formwork and reinforcing bars. During the formwork removal stage: the formwork is removed in sequence according to the concrete strength, and the support frame is removed in sections from top to bottom.

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

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

[0010] The aforementioned construction method for large-scale stadium cantilever structures based on BIM technology includes a two-way verification mechanism between the control point coordinates preset in the BIM model and the on-site measurement data during the surveying and setting-out process and the precise setting of control points using BIM technology. When the measured error exceeds the preset threshold, the model adjustment command is automatically triggered.

[0011] The above-mentioned construction method for the curved cantilever structure of a large venue based on BIM technology, in the stage of setting control points, the error between each positioning axis is digested within the axis by the chord center distance correction algorithm, and the error distribution value between grids is ≤1.5mm.

[0012] The above-mentioned construction method for large stadium curved cantilever structures based on BIM technology includes a step of setting up laser positioning fixtures in the irregular formwork arrangement stage when processing the irregular bottom formwork. This allows for automatic adjustment of the sawing angle based on the chord distance parameters output by BIM, ensuring the accuracy of the external corner curvature.

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

[0014] The above-mentioned construction method for the curved cantilever structure of a large venue based on BIM technology adopts a prefabricated stirrup cage hoisting process for the stirrups in the core area of ​​the beam-column joint during the reinforcement binding stage, and the hoisting point position is determined by BIM simulation.

[0015] The above-mentioned construction method for the curved cantilever structure of a large venue based on BIM technology also integrates an Internet of Things (IoT) module into the BIM platform, thereby enabling real-time monitoring of the verticality of the formwork support poles and automatic early 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 construction method for large-scale stadium curved cantilever structures based on BIM technology, in the BIM platform 1) The 3D modeling and detailed design module uses NURBS surface algorithm to fit irregular structures, integrates AutoCAD / Revit plugins to realize linked modification of drawings, and outputs control point drawings with QR code labels for on-site verification; 2) The construction simulation and optimization engine simulates formwork deformation based on finite element analysis (FEA); optimizes the spacing of support frames and the selection of uprights through genetic algorithms; and generates a layered and segmented scheme for concrete pouring. 3) The IoT data integration hub uses the MQTT protocol for device communication; it establishes a construction parameter database to store historical project data for machine learning optimization; and it is equipped with a threshold early warning system. 4) The dynamic verification and error control module uses a chord center distance correction algorithm to eliminate errors within the axis; it integrates laser scanning data and model deviation analysis functions; and it generates an error distribution heat map to guide on-site adjustments. 5) The collaborative management interface supports access from multiple terminals, including PCs, tablets, and AR glasses; integrates BIM model marking function and construction log system; and provides 3D animation instructions on the formwork 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 refinement scheme for the formwork reinforcement nodes.

[0018] This invention proposes a BIM-based construction method focusing on the construction of large stadiums with curved cantilever structures. Its key feature is the comprehensive and in-depth application of BIM technology. First, through the detailed design module of the BIM platform, this invention can precisely set control points, arranging them at 500mm intervals for each arc segment, and automatically generating a 3D model to guide construction, thus solving the problem of inadequate positioning and control measures in traditional construction. Second, this invention employs a systematic formwork erection method, erecting the formwork layer by layer in the order of adjustable base, uprights, horizontal bars, and diagonal bars, closely coordinating with formwork construction to ensure the stability of the construction platform and the accuracy of the structural framework. During the rebar binding stage, this invention innovatively uses a prefabricated stirrup cage hoisting process, determining the hoisting point positions through BIM simulation, further improving construction efficiency. Furthermore, this invention utilizes the BIM model for precise arrangement and processing guidance of irregularly shaped formwork, ensuring accurate formwork positioning and high shape precision. During concrete pouring, this invention incorporates a monitoring system, adopting a layered and segmented pouring method, and combining it with the BIM model's preset vibration trajectory to ensure the concrete density has no areas of missed vibration. Finally, during the formwork removal phase, this invention removes the formwork sequentially according to concrete strength, and dismantles the support frame in sections from top to bottom to ensure structural safety. The entire technical solution fully utilizes the visualization, parametric, and simulation optimization features of BIM technology, achieving refined management and quality control during the construction process, and significantly improving construction efficiency and project quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the marking of irregular structures at 500mm intervals during the drawing refinement process.

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

[0021] Figure 3 This is a diagram illustrating the reinforcement of irregularly shaped formwork during the formwork erection process. Detailed Implementation

[0022] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0023] like Figures 1-3 As shown, a construction method for a large stadium's curved cantilever structure based on BIM technology includes: I. Measurement and Setting Out 1) Detailed design of construction drawings In the 3D modeling and detailed design module of the BIM platform, construction drawings are imported, and the NURBS (Non-Uniform Rational B-Spline) surface algorithm is used to accurately fit the irregular structure. With its powerful surface modeling capabilities, the NURBS algorithm can handle various complex irregular structures, such as curved walls and arches, allowing designers to make fine adjustments to the surface to ensure the accuracy and constructability of the model.

[0024] Using parametric modeling technology, control points are set at 500mm intervals on the fitted irregular structure, and the distance and coordinates of these control points to the axis are automatically calculated.

[0025] A 3D model containing control point information is generated, and all control points are marked. Simultaneously, using the BIM platform's drawing output function, control point drawings with QR codes are output for on-site personnel to verify. Construction workers can use smartphones or dedicated scanning devices to scan the QR codes to quickly obtain accurate control point information and locations, and verify the accuracy of the control points by comparing them with actual measurement data.

[0026] 2) On-site measurement and layout implementation Based on the control point information in the BIM model, accurately locate and position the axis on site, and determine at least two positioning points.

[0027] The positioning point was repeatedly measured using a level to ensure accurate positioning with the error controlled within the allowable range.

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

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

[0030] For the error between each positioning axis, the error is absorbed within the axis by the chord center distance correction algorithm, and the error distribution value between the grids is controlled to be ≤1.5mm.

[0031] II. Formwork Erection 1) Setting up the operating platform After the surveying and setting out are completed, the operating platform in the construction area is erected according to the construction needs. Specifically, according to the construction plan, a stable operating platform is built in the designated location to provide a safe and convenient working surface for subsequent construction.

[0032] 2) Systematic erection of formwork support During the formwork erection process, the BIM platform integrates AutoCAD / Revit plugins to enable synchronized modification of drawings. When design changes occur, modifications can be made only within the BIM platform, and the plugins will automatically synchronize the changes to the AutoCAD or Revit drawings, ensuring the accuracy and consistency of the construction drawings.

[0033] The formwork support should be erected layer by layer in the order of adjustable base, uprights, horizontal bars, and diagonal bars to ensure the stability and load-bearing capacity of the formwork support.

[0034] During the construction process, the construction simulation and optimization engine in the BIM platform is used to perform 4D (3D + time) simulation, predict process conflicts and load changes, optimize the construction plan, and improve construction efficiency.

[0035] III. Reinforcing bar binding 1) Fixing of 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 and specification requirements in the drawings, and then weld them firmly with Φ10 steel bars.

[0036] 2) Binding of primary and secondary beams After securing all the fixed stirrups, begin tying the main beams in the short span direction.

[0037] After the main beams in the short span direction are tied, the main beams in the long span direction are then tied in an elevated manner.

[0038] After all the main beams have been tied, the secondary beams are then tied in the air.

[0039] During the reinforcement binding stage, the stirrups in the core area of ​​the beam-column joint were installed using a prefabricated stirrup cage hoisting process. BIM simulation was used to determine the hoisting points, and a tower crane was used to lift the beams onto the formwork, improving construction efficiency and safety.

[0040] IV. Formwork Engineering 1) Irregular template layout and processing The BIM platform is used to segment the irregular structure and calculate key parameters such as the midpoint, edge point, and center distance of the arc segment.

[0041] Laser positioning fixtures are installed in the woodworking shed, and the sawing angle is automatically adjusted based on the chord distance parameters output by BIM to ensure that the precision of the sawn irregular bottom mold meets the design requirements.

[0042] 2) Template installation and reinforcement Based on the preliminary BIM layout results, the shape, size, and position of the components are controlled before proceeding with formwork installation. During installation, ensure that the formwork is securely connected to the support frame to prevent deformation or displacement of the formwork.

[0043] During installation, the verticality of the formwork uprights is monitored in real time using the IoT data integration hub within the BIM platform. If any excessive tilt is detected, adjustments and reinforcements are immediately implemented to ensure the stability of the formwork.

[0044] For beams and slabs with a span of not less than 4m, the camber height during formwork construction shall be 1 / 1000 to 3 / 1000 of the beam or slab span. During the cambering process, precise measurements shall be taken using tools such as a level to ensure that the camber height meets the design requirements.

[0045] After the formwork installation is completed, a comprehensive acceptance and re-inspection will be conducted. During the acceptance process, the flatness, verticality, position, and reinforcement of the formwork will be thoroughly checked to ensure that the formwork installation quality meets the design requirements.

[0046] V. Concrete Pouring Construction 1) Preparations before pouring Use an air compressor or high-pressure water to clean debris from inside the formwork to ensure the quality of the concrete pouring. During the cleaning process, check the formwork for damage or leakage and repair it promptly.

[0047] 2) Control of the pouring process A layered, segmented, continuous construction method was adopted to ensure that each section of concrete could be poured continuously, avoiding cold joints. During the pouring process, a vibrator was used to thoroughly compact the concrete, ensuring its density.

[0048] During layered pouring, ultrasonic sensors are used to monitor the concrete density in real time. Simultaneously, vibration is performed using a pre-set vibration trajectory from the BIM model to ensure no areas are missed during vibration.

[0049] Before pouring vertical concrete structures, first pour the same mix ratio mortar with reduced gravel as the 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 vibration process, pay attention to controlling the vibration time and intensity to avoid over-vibration or missed vibration.

[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). Check the 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 it until the conditions are met and then remove it.

[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 corners 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, 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 corrects the measured value by comparing the deviation between the measured value and the theoretical value, using a correction coefficient. This correction process helps to more accurately reflect the actual chord center distance, thereby absorbing errors within the positioning axis.

[0059] 2) Control error allocation value: By applying the correction algorithm, it can be ensured that the error distribution between grids does not exceed 1.5mm. This is because the algorithm takes into account the source and magnitude of the error during the correction process and adjusts the measured value of the center distance of the chord accordingly, so that the error is reasonably distributed within the allowable range.

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

[0061] As can be seen from the above description of the specific implementation steps, this invention fully utilizes the advantages of BIM technology to achieve refined management and quality control in the construction of large-scale stadium cantilever structures. The various modules within the BIM platform collaborate and cooperate to ensure 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 improves construction efficiency and project quality.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A construction method for a large-scale stadium arc-shaped cantilever structure based on BIM technology, comprising the following steps: surveying and setting out, accurately setting control points using BIM technology; erecting formwork to ensure the stability of the construction platform; tying reinforcing bars to form the structural skeleton; formwork engineering, installing and adjusting the formwork to precise positions; concrete pouring construction, ensuring quality through layered and segmented pouring; and orderly formwork removal to ensure structural safety; 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 import construction drawings to automatically generate basic models, and to lay out control points at 500mm intervals for the curved cantilever structure through parametric modeling, automatically calculating the distance and coordinates between the control points and the axis; this module uses NURBS surface algorithm to fit irregular structures, integrates AutoCAD / Revit plugins to realize linked modification of drawings, and outputs control point drawings with QR code labels for on-site verification; 2) Construction simulation and optimization engine: performs 4D (3D + time) simulation of the construction process to predict process conflicts and load changes; the engine simulates formwork deformation based on finite element analysis (FEA); optimizes support frame spacing and upright selection through genetic algorithm; and generates layered and segmented concrete pouring schemes. 3) An IoT data integration hub receives data from sensors in real time, including pole tilt sensors and concrete density monitors; this hub uses the MQTT protocol to achieve device communication; and establishes a construction parameter database to store historical project data for machine learning optimization. It is equipped with a threshold early warning system; 4) Dynamic verification and error control module: This module compares measured data with the BIM model and automatically corrects construction deviations. It uses a chord center distance correction algorithm to eliminate errors within the axis. It integrates laser scanning data and model deviation analysis functions and generates an error distribution heat map to guide on-site adjustments. 5) Collaborative management interface, providing a visual operation platform for technical, safety, and construction personnel; this interface supports access from multiple terminals including PCs / tablets / AR glasses; integrates BIM model marking function and construction log system; provides 3D animation explanation of the formwork removal sequence; 6) Construction parameter optimization system: dynamically adjusts the construction plan based on real-time monitoring data; the system uses neural networks to predict the initial setting time of concrete; automatically optimizes the movement path of the vibrator; and generates secondary refinement plans for formwork reinforcement nodes. During the aforementioned construction process, During the surveying and setting-out stage, the layout of design control points is refined. BIM technology is used to refine the design of construction drawings. Control points are set at 500mm intervals in each arc segment, and the distance and coordinates of the control points to the axis are marked. A three-dimensional model is generated to guide construction. During the control point setting phase, precise positioning and error control are implemented. At least two positioning points are determined based on the site axes, and accuracy is ensured through repeated measurements. A level is used to determine the horizontal position, and a steel wire is stretched to form a horizontal line, controlling the error between each axis to ≤2mm. The error between each positioning axis is absorbed within the axis using a chord center distance correction algorithm, and the error distribution value between divisions is ≤1.5mm. The formula for 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; During the formwork erection phase, a systematic erection operation is implemented, with adjustable bases, uprights, horizontal bars, and diagonal bars erected layer by layer in sequence, and the elevation is adjusted in coordination with the formwork construction; after the erection is completed, a joint acceptance inspection is carried out on technical, safety, and construction aspects. During the reinforcement binding stage, after the stirrups in the core area of ​​the beam-column joint are welded and fixed, the main and secondary beams are bound in the air in the short span and long span directions; the tower crane is used to lower the beams as a whole to the formwork. In the irregular template layout stage; through BIM segmentation of irregular structures, calculate the midpoint, edge point and chord center distance of arc segments, and customize the irregular bottom mold; During the formwork installation phase, the shape, size, and position of components are controlled by combining the previous BIM layout. Monitoring should be implemented during the concrete pouring stage. Pouring should be done in layers and sections, with intervals controlled, and designated personnel should be assigned to observe the deformation of the formwork and reinforcing bars. During the formwork removal stage: the formwork is removed in sequence according to the concrete strength, and the support frame is removed in sections from top to bottom.

2. The construction method for a large stadium arc-shaped cantilever structure based on BIM technology according to claim 1, characterized in that: in During the measurement and layout process, BIM technology is used to accurately set control points. A two-way verification mechanism is preset in the BIM model between the control point coordinates and the on-site measurement data. When the measured error exceeds the preset threshold, the model adjustment command is automatically triggered.

3. The construction method for a large-scale stadium arc-shaped cantilever structure based on BIM technology according to claim 1, characterized in that: in In the irregular template layout stage, the processing of the irregular bottom mold includes the step of setting up a laser positioning fixture in the woodworking shed, so that the sawing angle can be automatically adjusted based on the chord distance parameter output by BIM to ensure the accuracy of the external corner curvature.

4. The construction method for a large-scale stadium arc-shaped cantilever structure based on BIM technology according to claim 1, characterized in that: During the concrete pouring stage, ultrasonic sensors are used to monitor the concrete density in real time during layered pouring, and the vibration trajectory is preset in the BIM model to ensure that there are no areas where vibration is missed.

5. The construction method for a large stadium arc-shaped cantilever structure based on BIM technology according to claim 1, characterized in that: in During the reinforcement binding stage, the stirrups in the core area of ​​the beam-column joint are hoisted as a whole using a precast stirrup cage, and the hoisting point positions are determined through BIM simulation.

6. The construction method for a large-scale stadium arc-shaped cantilever structure based on BIM technology according to claim 1, characterized in that: The BIM platform integrates an IoT module to enable real-time monitoring of the verticality of the formwork support poles and automatic early warning of excessive tilt. During the concrete pouring process, the load distribution is dynamically updated using a BIM model to guide the adjustment of the support system.

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