An interactive control method for the installation alignment of the main arch ribs of a long-span tied arch bridge

Abstract

This invention discloses an interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge, comprising: establishing an installation model of the main arch rib of the long-span tied arch bridge; installing the main arch rib according to the main arch rib installation model and a preset installation method; acquiring installation data during the installation process, inputting the installation data into an alignment and stability analysis model, and outputting linear and stability analysis results; and adjusting the main arch rib installation strategy based on the linear and stability analysis results. By installing the main arch rib based on the main arch rib installation model and a preset installation method, inputting the installation data into the alignment and stability analysis model, and outputting linear and stability analysis results, the method avoids installation instability and quality problems, thereby improving construction safety.

Description

Technical Field

[0001] This invention relates to the field of arch rib installation technology, and in particular to an interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge. Background Technology

[0002] Long-span tied arch bridges primarily utilize steel box girder arch ribs. The time-varying characteristics of meteorological parameters such as solar radiation, air temperature, and wind speed inevitably lead to real-time changes in the structural temperature field. During the cable-stayed installation of the arch bridge, this results in uneven temperature distribution within the arch ribs and temperature differences between the cables and the structure, causing significant temperature deformation. Current technology divides the main arch ribs into several segments, which are fabricated in a factory or prefabrication yard, then hoisted to the bridge site and installed segment by segment from the arch foot towards the mid-span. These segments are then joined with the already installed segments and secured with diagonal cables until the bridge is closed at the mid-span. The lack of linearity and stability analysis of the installation data during this process can lead to installation instability, quality problems, and safety hazards. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in the aforementioned technologies. Therefore, the purpose of this invention is to propose an interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge. Based on the main arch rib installation model and preset installation methods, the main arch rib is installed. The installation data is input into the alignment and stability analysis model, and the linearity and stability analysis results are output, thus avoiding installation instability and quality problems and improving construction safety.

[0004] To achieve the above objectives, embodiments of the present invention propose an interactive control method for the installation alignment of the main arch ribs of a long-span tied arch bridge, comprising:

[0005] Establish an installation model for the main arch ribs of a long-span tied arch bridge;

[0006] The main arch ribs are installed according to the main arch rib installation model and the preset installation method;

[0007] During the installation process, installation data is acquired, input into the linear and stability analysis model, and the linear and stability analysis results are output.

[0008] The installation strategy for the main arch ribs was adjusted based on the results of linear and stability analysis.

[0009] According to some embodiments of the present invention, a main arch rib installation model for a long-span tied arch bridge is established, including:

[0010] Several monitoring points are set up in the main arch rib installation area of ​​the long-span tied arch bridge; wherein, the monitoring points are used to monitor the installation data of the main arch rib of the long-span tied arch bridge during the installation process;

[0011] The monitoring points are scanned using structured light scanning technology to generate the first scan data;

[0012] The monitoring points are scanned using TOF scanning technology to generate second scan data;

[0013] The first scan data and the second scan data are fused based on the FICP algorithm to generate a constructed dataset;

[0014] An installation model of the main arch rib of a long-span tied arch bridge was established based on the constructed dataset.

[0015] According to some embodiments of the present invention, a monitoring point is scanned based on structured light scanning technology to generate first scan data, including:

[0016] The structured light scanning device includes a laser that projects light of a specific pattern onto a monitoring point; the specific pattern includes at least one of stripes, grids, and dot matrix.

[0017] The structured light scanning device includes a first camera that captures light pattern images reflected back from the monitored point;

[0018] The light pattern image is analyzed based on the image processing algorithm to determine the deformation information of the light pattern;

[0019] The deformation information is compared with light of a specific pattern to determine the three-dimensional coordinates of the surface of the monitoring point, thus obtaining the first scan data.

[0020] According to some embodiments of the present invention, a second scan data is generated by scanning the monitoring point based on TOF scanning technology, including:

[0021] The TOF device includes a near-infrared laser that emits short pulses of near-infrared light toward the monitoring point;

[0022] The photodetector included in the TOF device receives the light pulse signal reflected back from the monitoring point;

[0023] The received light pulse signal is processed using a time measurement circuit to calculate the distance value at the corresponding position of each pixel;

[0024] The calculated distance value is combined with the pixel position of the second camera included in the TOF device to generate three-dimensional point cloud data of the monitoring point, thus generating the second scan data.

[0025] According to some embodiments of the present invention, a data fusion method is used to combine first scan data and second scan data based on the FICP algorithm to generate a constructed dataset, including:

[0026] The first and second scan data are coarsely aligned based on the feature point matching method.

[0027] The FI CP algorithm is used to find the nearest point pairs between two sets of scan data after coarse alignment, and the rigid body transformation that minimizes the error between these point pairs is calculated. Data fusion is then performed to generate the constructed dataset.

[0028] According to some embodiments of the present invention, the preset installation method includes:

[0029] The main arch rib is assembled from multiple arch rib segments. Each arch rib segment is lifted and transported using cable cranes. After lifting, welding is performed to complete the installation of the first arch rib segment.

[0030] By setting cantilevered anchor beams at the main arch rib fastening points and ensuring that the spacing between the fastening cables is greater than the cross-sectional width of the arch rib, the remaining arch rib segments are hoisted and transported using cable cranes and cantilevered anchor beams to complete the installation of the remaining arch rib segments, and horizontal bracing is installed between the arch ribs.

[0031] According to some embodiments of the present invention, welding is performed after hoisting is completed, including:

[0032] Based on the welding position of the first segment of the arch rib, a planar coordinate system is constructed, and the motion waveform of the welding laser is constructed in the planar coordinate system;

[0033]

[0034] Among them, Y i When the x-coordinate is X i The corresponding value of the ordinate, X i is the independent variable of the motion waveform, i.e., the value of the horizontal axis, which takes the value of all values ​​corresponding to the welding position of the first segment arch rib on the horizontal axis; K is the stirring frequency of the laser emitted by the welding laser; v is the welding speed of the first segment arch rib; x0 is the value of the horizontal axis of the initial welding position; y0 is the value of the vertical axis of the initial welding position; s is the stirring amplitude of the laser emitted by the welding laser; θ is the phase angle of the welding.

[0035] Welding processing is performed based on the motion waveform of a welding laser.

[0036] According to some embodiments of the present invention, a method for obtaining a linearity and stability analysis model includes:

[0037] Based on hoisting simulation technology, the hoisting of segmental arch ribs under different wind speed environments is simulated to obtain the first analysis data;

[0038] Welding simulation technology was used to simulate the welding of segmental arch ribs under different sunlight conditions and obtain secondary analysis data.

[0039] Welding process simulation technology was used to simulate the welding of segmental arch ribs under different welding sequences and obtain third analysis data.

[0040] A linear and stability analysis model is obtained based on the first, second, and third analysis data.

[0041] According to some embodiments of the present invention, before installing the main arch rib according to the main arch rib installation model and the preset installation method, the method further includes: determining the target installation temperature of the main arch rib of the long-span tied arch bridge.

[0042] According to some embodiments of the present invention, determining the target installation temperature of the main arch rib of a long-span tied arch bridge includes:

[0043] Simulations were performed at different installation temperatures to obtain cable force information at n different installation temperatures, forming a cable force vector C. The temperature adjustment coefficient was then determined based on the cable force vector C.

[0044]

[0045] Where F(C) is the temperature regulation coefficient; C i Let be the i-th value of the cable force vector C; sum(C) is the summation of the cable force vector C; F is the preset standard cable force; ∞ represents infinity; To integrate an expression containing x;

[0046] The target installation temperature of the main arch rib of a long-span tied arch bridge is determined based on the temperature regulation coefficient.

[0047]

[0048] Where T is the target installation temperature; T1 is the temperature corresponding to the maximum value in the cable force vector C; and T2 is the temperature corresponding to the minimum value in the cable force vector C.

[0049] This invention proposes an interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge. The main arch rib is installed based on the main arch rib installation model and preset installation method. The installation data is input into the alignment and stability analysis model, and the linearity and stability analysis results are output to avoid installation instability and quality problems and improve construction safety.

[0050] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0051] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0052] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0053] Figure 1 This is a flowchart of an interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge according to an embodiment of the present invention;

[0054] Figure 2 This is a flowchart of establishing the main arch rib installation model of a long-span tied arch bridge according to an embodiment of the present invention;

[0055] Figure 3 This is a flowchart of generating first scan data according to an embodiment of the present invention. Detailed Implementation

[0056] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0057] like Figure 1 As shown, this embodiment of the invention proposes an interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge, including steps S1-S4:

[0058] S1. Establish the main arch rib installation model of a long-span tied arch bridge;

[0059] S2. Install the main arch rib according to the main arch rib installation model and the preset installation method;

[0060] S3. During the installation process, acquire installation data, input the installation data into the linear and stability analysis model, and output the linear and stability analysis results.

[0061] S4. Adjust the main arch rib installation strategy based on the results of linearity and stability analysis.

[0062] The working principle of the above technical solution is as follows: A main arch rib installation model of a long-span tied arch bridge is established. The main arch rib is then installed according to the model and a pre-set installation method. As installation progresses, various key data, such as the position, deformation, and stress of the arch rib, are acquired in real time. This data is obtained through sensors and measuring equipment. The acquired data is input into a linearity and stability analysis model, which evaluates the arch rib's linearity (shape and position) and stability (resistance to instability). By analyzing this data, the linearity and stability analysis results of the current state of the arch rib can be obtained. The installation strategy is adjusted based on the linearity and stability analysis results. If the arch rib's linearity or stability is found to be inconsistent with expectations, timely adjustments are necessary. This includes adjusting the arch rib's position, reinforcing the structure, and changing the installation method. The adjusted strategy needs to be verified again through the model to ensure its feasibility and safety. This process is a dynamic and interactive control process.

[0063] The beneficial effects of the above technical solution are as follows: By combining model prediction, real-time monitoring, and strategy adjustment, precise control of the installation alignment of the main arch ribs of long-span tied arch bridges can be achieved. This not only improves the accuracy and efficiency of installation but also ensures the safety and stability of the bridge structure.

[0064] like Figure 2 As shown, according to some embodiments of the present invention, a main arch rib installation model for a long-span tied arch bridge is established, including steps S11-S15:

[0065] S11. Several monitoring points are set up in the main arch rib installation area of ​​the long-span tied arch bridge; wherein, the monitoring points are used to monitor the installation data of the main arch rib of the long-span tied arch bridge during the installation process;

[0066] S12. Scan the monitoring points using structured light scanning technology to generate the first scan data;

[0067] S13. Scan the monitoring points using TOF scanning technology to generate second scan data;

[0068] S14. Based on the F-ICP algorithm, the first scan data and the second scan data are fused to generate a dataset;

[0069] S15. Based on the constructed dataset, establish the main arch rib installation model of the long-span tied arch bridge.

[0070] The working principle of the above technical solutions is as follows: Monitoring points are rationally arranged in the installation area of ​​the main arch rib. These monitoring points should be able to comprehensively reflect key information such as deformation and displacement of the main arch rib during installation. The number and location of monitoring points are determined according to the scale, structural characteristics, and installation requirements of the bridge to ensure the comprehensiveness and accuracy of the data. Structured light scanning technology is a non-contact 3D measurement technology that generates a 3D model of an object by projecting structured light onto the object's surface and capturing the reflected light. In this step, the monitoring points are scanned using structured light scanning technology to obtain the 3D coordinates and shape information of the monitoring points, generating the first scan data. Time-of-flight (TOF) scanning technology is a 3D scanning technology based on the time-of-flight measurement of light pulses. It emits a beam of light pulse onto the object's surface and measures the time difference between the light pulse emission and reception to calculate the distance between the object and the scanner. In this step, the monitoring points are scanned using TOF scanning technology to obtain the depth information of the monitoring points, generating the second scan data. These data complement the first scan data, improving the accuracy and completeness of the model. The F-ICP algorithm is an algorithm used for 3D point cloud data registration and fusion. It iteratively finds the nearest point pair between two sets of point clouds and calculates the transformation matrix to align the two sets of point clouds. In this step, the F-ICP algorithm is used to fuse the first and second scan data, generating a constructed dataset with richer information. This dataset provides reliable data support for the subsequent establishment of the main arch rib installation model. The constructed dataset is used to build the main arch rib installation model of a long-span tied arch bridge. This model is a three-dimensional, dynamic, and interactive model capable of simulating the installation process, deformation, and stability of the main arch rib.

[0071] The beneficial effects of the above technical solution are: it ensures the accuracy and reliability of the main arch rib installation model of the long-span tied arch bridge, thereby ensuring the safety and stability of the bridge structure.

[0072] like Figure 3 As shown, according to some embodiments of the present invention, scanning of monitoring points based on structured light scanning technology to generate first scan data includes steps S121-S124:

[0073] S121. The structured light scanning device includes a laser that projects light of a specific pattern onto a monitoring point; the specific pattern includes at least one of stripes, grids, and dot matrix.

[0074] S122, The structured light scanning device includes a first camera that captures light pattern images reflected back from the monitored point;

[0075] S123. Analyze the light pattern image based on the image processing algorithm to determine the deformation information of the light pattern;

[0076] S124. Compare the deformation information with the light of a specific mode to determine the three-dimensional coordinates of the surface of the monitoring point and obtain the first scan data.

[0077] The working principle of the above technical solution is as follows: A laser in the structured light scanning device is used to project a specific pattern of light onto the monitoring point. This specific pattern can be at least one of stripes, grids, or dot matrix. The choice of these patterns depends on the scanning accuracy, speed, and resolution requirements. Stripe patterns are typically used for rapid scanning, while grid and dot matrix patterns may provide more detailed three-dimensional information. When the specific pattern of light is projected onto the monitoring point, the light pattern is deformed due to the surface shape of the monitoring point. This deformed light pattern is then captured by a first camera in the structured light scanning device. The camera captures a reflected image of the light pattern, which contains shape information of the monitoring point surface. The captured light pattern image is analyzed using image processing algorithms. The algorithm's task is to identify the deformation of the light pattern, which is caused by unevenness or shape changes on the monitoring point surface. By analyzing the deformation information, the three-dimensional shape of the monitoring point surface can be inferred. The deformation information is compared with the original projected specific pattern of light. Since structured light scanning technology is based on known light patterns, the three-dimensional coordinates of the monitoring point surface can be calculated by comparing the light patterns before and after deformation. These three-dimensional coordinates constitute the first scan data, reflecting the position of the monitoring point in three-dimensional space.

[0078] The beneficial effects of the above technical solution are: by combining multiple steps such as laser projection, image capture, image processing, and 3D coordinate calculation, it ensures the accuracy and reliability of the scanned data. This initial scan data provides an important foundation for subsequent data fusion and model building.

[0079] According to some embodiments of the present invention, a second scan data is generated by scanning the monitoring point based on TOF scanning technology, including:

[0080] The TOF device includes a near-infrared laser that emits short pulses of near-infrared light toward the monitoring point;

[0081] The photodetector included in the TOF device receives the light pulse signal reflected back from the monitoring point;

[0082] The received light pulse signal is processed using a time measurement circuit to calculate the distance value at the corresponding position of each pixel;

[0083] The calculated distance value is combined with the pixel position of the second camera included in the TOF device to generate three-dimensional point cloud data of the monitoring point, thus generating the second scan data.

[0084] The working principle of the above technical solution is as follows: The core of Time-of-Flight (TOF) scanning technology lies in using a near-infrared laser to emit short pulses of light. These light pulses have extremely short durations, typically on the order of nanoseconds. When these light pulses are emitted to the monitoring point, they are reflected back and received by the TOF device. Since the speed of light in air is known, the distance between the monitoring point and the TOF device can be calculated by measuring the round-trip time of the light pulse. The reflected light pulse signal is received by a photodetector in the TOF device. A photodetector is a device that converts light signals into electrical signals. When a light pulse is received, the photodetector generates a corresponding electrical signal. This electrical signal is then transmitted to the time measurement circuit for processing. The time measurement circuit is one of the core components of the TOF device. Its task is to measure the time difference between the emission and reception of the light pulse and calculate the distance between the monitoring point and the TOF device based on this time difference. Since the TOF device contains a two-dimensional array of photodetectors (i.e., a camera), the distance value at the location corresponding to each pixel can be calculated. These distance values ​​together constitute the three-dimensional information of the monitoring point. The calculated distance values ​​are then combined with the pixel positions of the second camera. Since each pixel has a known location coordinate, the distance value can be combined with these location coordinates to generate a 3D point cloud. This 3D point cloud contains the 3D coordinate information of the monitoring point, i.e., the second scan data.

[0085] The beneficial effects of the above technical solution are: by combining multiple steps such as near-infrared light emission, light pulse reception, time measurement, and three-dimensional point cloud data generation, the accuracy and reliability of the scanning data are ensured.

[0086] According to some embodiments of the present invention, a data fusion method is used to combine first scan data and second scan data based on the FICP algorithm to generate a constructed dataset, including:

[0087] The first and second scan data are coarsely aligned based on the feature point matching method.

[0088] The F-ICP algorithm is used to find the nearest point pairs between two sets of scan data after coarse alignment, and the rigid body transformation that minimizes the error between these point pairs is calculated. Data fusion is then performed to generate the constructed dataset.

[0089] The working principle of the above technical solution is as follows: In the initial stage of data fusion, feature point matching methods (such as SIFT, SURF, ORB, etc.) are first used to coarsely align the first and second scan data. The purpose of this step is to quickly reduce the initial positional differences between the two sets of data, providing a better starting point for subsequent fine alignment. Feature point matching methods detect key points (i.e., regions with significant features) in the image and calculate the descriptors of these key points. Then, they find the most similar point pairs of descriptors between the two sets of data, thereby establishing a preliminary correspondence. Based on these correspondences, preliminary rigid body transformations (including rotation and translation) can be calculated to achieve coarse alignment of the two sets of data. After coarse alignment, the F-ICP algorithm is used for fine alignment. The F-ICP algorithm is an improved ICP algorithm that finds the nearest point pairs between the two sets of scan data through rapid iteration and calculates the rigid body transformations (including rotation matrices and translation vectors) that minimize the error (usually Euclidean distance) between these point pairs. In each iteration, the F-ICP algorithm calculates the point pair error between the two sets of data based on the current transformation parameters to update the transformation parameters and reduce the error. This process iterates until a predetermined number of iterations is reached or the error falls below a certain threshold. After fine alignment, the positional differences between the two sets of scan data have been significantly reduced, allowing them to be fused together to generate a richer dataset. This dataset is a 3D point cloud containing all points from both sets of data, and these points have been aligned to the same coordinate system through rigid body transformation.

[0090] The beneficial effects of the above technical solution are: it can effectively fuse the first scan data with the second scan data to generate a constructed dataset containing richer information. This process involves multiple steps such as coarse alignment, fine alignment, and data fusion, ensuring the accuracy and reliability of the data fusion.

[0091] According to some embodiments of the present invention, the preset installation method includes:

[0092] The main arch rib is assembled from multiple arch rib segments. Each arch rib segment is lifted and transported using cable cranes. After lifting, welding is performed to complete the installation of the first arch rib segment.

[0093] By setting cantilevered anchor beams at the main arch rib fastening points and ensuring that the spacing between the fastening cables is greater than the cross-sectional width of the arch rib, the remaining arch rib segments are hoisted and transported using cable cranes and cantilevered anchor beams to complete the installation of the remaining arch rib segments, and horizontal bracing is installed between the arch ribs.

[0094] The working principle of the above technical solution is as follows: The main arch rib is assembled from multiple segments. Each segment is lifted and transported using a cable crane. After lifting, welding is performed to ensure a secure connection between the segments. The installation of the first arch rib segment is completed. This is the starting point of the entire installation process, laying the foundation for the installation of subsequent segments. Cantilevered anchor beams are installed at the main arch rib fastening points. Cantilevered anchor beams are structures used to support and fix the fastening cables, ensuring their stability and safety. The spacing between the fastening cables is greater than the width of the arch rib cross-section. This ensures that the fastening cables can firmly fix the arch rib while avoiding unnecessary pressure or damage to the arch rib. The remaining arch rib segments are lifted and transported using a cable crane and cantilevered anchor beams. This process is similar to the lifting process of the first segment, but cantilevered anchor beams are used to provide additional support. The installation of the remaining arch rib segments is completed. As each segment is installed, the main arch rib gradually reveals its complete form. Horizontal bracing is installed between the arch ribs. A cross brace is a component used to enhance structural stability. It connects adjacent arch ribs, improving the stiffness and stability of the entire structure.

[0095] The beneficial effects of the above technical solution are as follows: This pre-installation method involves several key steps, including the assembly and hoisting of segmental arch ribs, the setting of cantilever anchor beams and the hoisting of the remaining segments, and the installation of cross braces, to ensure the stability and accuracy of the structure.

[0096] According to some embodiments of the present invention, welding is performed after hoisting is completed, including:

[0097] Based on the welding position of the first segment of the arch rib, a planar coordinate system is constructed, and the motion waveform of the welding laser is constructed in the planar coordinate system;

[0098]

[0099] Among them, Y i When the x-coordinate is X i The corresponding value of the ordinate, X i is the independent variable of the motion waveform, i.e., the value of the horizontal axis, which takes the value of all values ​​corresponding to the welding position of the first segment arch rib on the horizontal axis; K is the stirring frequency of the laser emitted by the welding laser; v is the welding speed of the first segment arch rib; x0 is the value of the horizontal axis of the initial welding position; y0 is the value of the vertical axis of the initial welding position; s is the stirring amplitude of the laser emitted by the welding laser; θ is the phase angle of the welding.

[0100] Welding processing is performed based on the motion waveform of a welding laser.

[0101] The working principle of the above technical solution is as follows: Based on the welding position of the first arch rib segment, a planar coordinate system is first constructed. This coordinate system is used to accurately locate the motion trajectory of the welding laser. Welding parameters are determined, including: the stirring frequency (K) of the laser emitted by the welding laser, the welding speed (v), the abscissa (x0) and ordinate (y0) of the initial welding position, the laser stirring amplitude (s), and the welding phase angle (θ). The motion waveform of the welding laser is calculated. This waveform describes the motion trajectory of the laser in the planar coordinate system. When performing welding based on the motion waveform of the welding laser, the parameters of the welding laser, including laser power, stirring frequency, and moving speed, are configured according to the calculated motion waveform. The welding laser is then started, moving according to the preset motion waveform to weld the first arch rib segment. During the welding process, the laser beam emitted by the laser precisely scans the welding position according to the waveform, achieving high-quality welding.

[0102] The beneficial effects of the above technical solution are as follows: Automated welding technology based on the motion waveform of welding laser can greatly improve the accuracy and efficiency of welding, and provide strong protection for the stability and safety of the entire structure.

[0103] According to some embodiments of the present invention, a method for obtaining a linearity and stability analysis model includes:

[0104] Based on hoisting simulation technology, the hoisting of segmental arch ribs under different wind speed environments is simulated to obtain the first analysis data;

[0105] Welding simulation technology was used to simulate the welding of segmental arch ribs under different sunlight conditions and obtain secondary analysis data.

[0106] Welding process simulation technology was used to simulate the welding of segmental arch ribs under different welding sequences and obtain third analysis data.

[0107] A linear and stability analysis model is obtained based on the first, second, and third analysis data.

[0108] The working principle of the above technical solution is as follows: Based on hoisting simulation technology, the hoisting process of segmental arch ribs is simulated under different wind speed environments to evaluate the dynamic response and stability during the hoisting process. Different wind speed environments are set, including calm winds, light winds, and strong winds. Hoisting simulation software is used to input key information such as the geometric parameters, material properties, and hoisting method of the segmental arch ribs. The simulation is run, and parameters such as displacement, deformation, and stress of the segmental arch ribs during the hoisting process are observed and recorded. Initial analysis data is obtained, including the dynamic response and stability assessment results during the hoisting process.

[0109] Welding simulation technology was used to simulate the welding process of segmental arch ribs under different sunlight conditions to evaluate the temperature distribution, deformation, and impact on the shape during welding. Different sunlight environments were set, including sunny days, cloudy days, and daytime temperature differences. Welding simulation software was used, with key information such as welding parameters, material thermal properties, and welding heat source models for the segmental arch ribs input. The simulation was run, and parameters such as temperature distribution, deformation, and residual stress during the welding process were observed and recorded. Secondary analysis data was obtained, including the temperature field, deformation field, and stress field results during the welding process.

[0110] Welding process simulation technology was used to simulate the welding process of segmental arch ribs under different welding sequences to evaluate the impact of welding sequence on shape and stability. Different welding sequence schemes were set, including symmetrical welding, asymmetrical welding, and segmented welding strategies. Welding process simulation software was used to input key information such as the geometric model of the segmental arch rib, welding parameters, and welding sequence. The simulation was run, and the deformation, stress distribution, and other parameters of the segmental arch rib under different welding sequences were observed and recorded. Third-party analysis data was obtained, including changes in shape and stability assessment results under different welding sequences.

[0111] Based on the first, second, and third analysis data, a linearity and stability analysis model was obtained. The simulation results were processed and analyzed to extract key parameters and indicators. Based on the analysis results, the linearity and stability performance of the segmental arch rib under different conditions was evaluated, and a linearity and stability analysis model was obtained.

[0112] The beneficial effects of the above technical solution are: it makes full use of the advantages of simulation technology, and obtains rich analytical data by simulating the segmental arch rib hoisting and welding process under different conditions, which provides strong support for building an accurate linearity and stability analysis model.

[0113] According to some embodiments of the present invention, before installing the main arch rib according to the main arch rib installation model and the preset installation method, the method further includes: determining the target installation temperature of the main arch rib of the long-span tied arch bridge.

[0114] The working principle and beneficial effects of the above technical solution are as follows: Since the steel pipe arch ribs, ties, guy ropes, and cable cranes are all made of steel, their coefficient of linear expansion is relatively large, making them particularly sensitive to temperature. As the temperature changes at different times of day, the position of the arch rib segments after hoisting will also change accordingly. Therefore, for accurate positioning and ease of construction, a target installation temperature is determined to ensure that the final position of the arch rib segments after hoisting and welding meets the design requirements.

[0115] According to some embodiments of the present invention, determining the target installation temperature of the main arch rib of a long-span tied arch bridge includes:

[0116] Simulations were performed at different installation temperatures to obtain cable force information at n different installation temperatures, forming a cable force vector C. The temperature adjustment coefficient was then determined based on the cable force vector C.

[0117]

[0118] Where F(C) is the temperature regulation coefficient; C i Let be the i-th value of the cable force vector C; sum(C) is the summation of the cable force vector C; F is the preset standard cable force; ∞ represents infinity; To integrate an expression containing x;

[0119] The target installation temperature of the main arch rib of a long-span tied arch bridge is determined based on the temperature regulation coefficient.

[0120]

[0121] Where T is the target installation temperature; T1 is the temperature corresponding to the maximum value in the cable force vector C; and T2 is the temperature corresponding to the minimum value in the cable force vector C.

[0122] The working principle of the above technical solution is as follows: Simulations are performed at different installation temperatures, covering a possible temperature range, to ensure that the most suitable installation temperature can be found. The simulations should consider the influence of multiple factors such as the arch rib, rigging, wind load, and temperature to obtain accurate cable force information. For each simulation temperature, the cable force vector C is recorded, where C0... i Let be the i-th value of the cable force vector C. The temperature adjustment coefficient is determined based on cable force vector C. The integral part of the formula represents the probability distribution function from the preset standard cable force F to infinity, used to evaluate the deviation of cable force vector C from the standard cable force. Based on cable force vector C, the temperature corresponding to the maximum value and the temperature corresponding to the minimum value of cable force vector C are determined. T is the target installation temperature, which is the installation temperature that meets both cable force requirements and considers the influence of temperature.

[0123] The beneficial effects of the above technical solution are as follows: by simulating the cable force information under different installation temperatures and using the given formula to calculate the temperature adjustment coefficient, the target installation temperature of the main arch rib of a long-span tied arch bridge can be determined, which facilitates the improvement of installation accuracy and stability.

[0124] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An interactive control method for the installation alignment of the main arch ribs of a long-span tied arch bridge, characterized in that, include: Establish an installation model for the main arch ribs of a long-span tied arch bridge; The main arch ribs are installed according to the main arch rib installation model and the preset installation method; During the installation process, installation data is acquired, input into the linear and stability analysis model, and the linear and stability analysis results are output. The installation strategy for the main arch ribs was adjusted based on the results of linear and stability analysis. Before installing the main arch rib according to the main arch rib installation model and preset installation method, the following steps are also included: determining the target installation temperature of the main arch rib of the long-span tied arch bridge; Determine the target installation temperature for the main arch ribs of a long-span tied arch bridge, including: Simulations were performed at different installation temperatures to obtain cable force information at n different installation temperatures, forming a cable force vector C. The temperature adjustment coefficient was then determined based on the cable force vector C. ； in, This is the temperature regulation coefficient; Cable force vector The i-th value; For the force vector of the cable Summation; The preset standard cable force; It is infinitely large; To a containing Integrate the expression; The target installation temperature of the main arch rib of a long-span tied arch bridge is determined based on the temperature regulation coefficient. ； in, Install the target temperature; The temperature corresponding to the maximum value in the cable force vector C; The temperature corresponding to the minimum value in the cable force vector C.

2. The interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge as described in claim 1, characterized in that, Establish an installation model for the main arch ribs of a long-span tied arch bridge, including: Several monitoring points are set up in the main arch rib installation area of ​​the long-span tied arch bridge; wherein, the monitoring points are used to monitor the installation data of the main arch rib of the long-span tied arch bridge during the installation process; The monitoring points are scanned using structured light scanning technology to generate the first scan data; The monitoring points are scanned using TOF scanning technology to generate second scan data; The first scan data and the second scan data are fused based on the F-ICP algorithm to generate a constructed dataset; An installation model of the main arch rib of a long-span tied arch bridge was established based on the constructed dataset.

3. The interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge as described in claim 2, characterized in that, The monitoring points are scanned using structured light scanning technology to generate the first scan data, including: The structured light scanning device includes a laser that projects light of a specific pattern onto a monitoring point; the specific pattern includes at least one of stripes, grids, and dot matrix. The structured light scanning device includes a first camera that captures light pattern images reflected back from the monitored point; The light pattern image is analyzed based on the image processing algorithm to determine the deformation information of the light pattern; The deformation information is compared with light of a specific pattern to determine the three-dimensional coordinates of the surface of the monitoring point, thus obtaining the first scan data.

4. The interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge as described in claim 2, characterized in that, The monitoring points are scanned using Time-of-Flight (TOF) scanning technology to generate second scan data, including: The TOF device includes a near-infrared laser that emits short pulses of near-infrared light toward the monitoring point; The photodetector included in the TOF device receives the light pulse signal reflected back from the monitoring point; The received light pulse signal is processed using a time measurement circuit to calculate the distance value at the corresponding position of each pixel; The calculated distance value is combined with the pixel position of the second camera included in the TOF device to generate three-dimensional point cloud data of the monitoring point, thus generating the second scan data.

5. The interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge as described in claim 2, characterized in that, The F-ICP algorithm is used to fuse the first scan data and the second scan data to generate a dataset, including: The first and second scan data are coarsely aligned based on the feature point matching method. The F-ICP algorithm is used to find the nearest point pairs between two sets of coarsely aligned scan data, and the rigid body transformation that minimizes the error between these point pairs is calculated. Data fusion is then performed to generate the constructed dataset.

6. The interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge as described in claim 1, characterized in that, The preset installation methods include: The main arch rib is assembled from multiple arch rib segments. Each arch rib segment is lifted and transported using cable cranes. After lifting, welding is performed to complete the installation of the first arch rib segment. By setting cantilevered anchor beams at the main arch rib fastening points and ensuring that the spacing between the fastening cables is greater than the cross-sectional width of the arch rib, the remaining arch rib segments are hoisted and transported using cable cranes and cantilevered anchor beams to complete the installation of the remaining arch rib segments, and horizontal bracing is installed between the arch ribs.

7. The interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge as described in claim 6, characterized in that, Welding is performed after hoisting is completed, including: Based on the welding position of the first segment of the arch rib, a planar coordinate system is constructed, and the motion waveform of the welding laser is constructed in the planar coordinate system; ； in, When the x-coordinate takes the value The corresponding value of the y-axis, The independent variable of the motion waveform is the value of the horizontal axis, which is all the values ​​corresponding to the welding position of the first segment arch rib on the horizontal axis. The stirring frequency for the laser emitted by the welding laser; The welding speed for the first arch rib segment; This represents the x-coordinate of the initial welding position; This represents the value of the ordinate of the initial welding position; The stirring amplitude of the laser emitted by the welding laser; The phase angle for welding; Welding processing is performed based on the motion waveform of a welding laser.

8. The interactive control method for the installation alignment of the main arch rib of a long-span tied arch bridge as described in claim 1, characterized in that, Methods for obtaining linear and stability analysis models include: Based on hoisting simulation technology, the hoisting of segmental arch ribs under different wind speed environments is simulated to obtain the first analysis data; Welding simulation technology was used to simulate the welding of segmental arch ribs under different sunlight conditions and obtain secondary analysis data. Welding process simulation technology was used to simulate the welding of segmental arch ribs under different welding sequences and obtain third analysis data. A linear and stability analysis model is obtained based on the first, second, and third analysis data.

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