A high-precision erection digital control method for a box girder

Abstract

The application discloses a kind of box girder high-precision erection digital control method, comprising the following steps: S1, linear element data acquisition: S2, box girder entity parameter measurement: S3, cushion stone parameter collection: the elevation data of cushion stone is measured, and the accurate coordinate of cushion stone support center is acquired;Cushion stone elevation data is stored as elevation array, and the coordinate of cushion stone support center is stored as coordinate point array, to ensure the accuracy and integrity of data, so as to consider the influence of cushion stone factor on beam in subsequent calculation;S4, bridge surface accessory data measurement: for prefabricated "three walls" and other bridge surface accessories, measure the amount of data of staggered table at different positions, and store as staggered table amount array;These data will be used to simulate the actual installation of accessory in three-dimensional simulation model, to achieve the purpose of beautifying bridge surface accessory;S5, design linear element integration: integrate other elements in design linear element, such as bridge surface width, superhigh setting, lane position and other information;And combine these design element data with the actual measured data collected, to provide comprehensive parameter support for building complete three-dimensional simulation model and formulating erection scheme.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, and particularly relates to a high-precision erection digital control method for a box girder. BACKGROUND

[0002] In modern bridge construction, the erection of box girders is one of the key links. As of 2023, the total length of railways in operation in China is 159,000 kilometers, including 45,000 kilometers of high-speed railways. The proportion of bridges in newly built high-speed railway lines is large, and most of the bridges use precast box girder erection construction technology. The precision of the technology directly affects the service life, driving comfort and overall safety of the bridge.

[0003] However, the traditional box girder erection method often relies on manual experience and simple measuring tools, which is difficult to meet the increasing precision requirements of bridge construction. With the development of digital technology, it is inevitable to use software for precise control, but the existing box girder erection control technology still has deficiencies in the comprehensiveness of the considered factors and the accuracy of the model. For example, the linear element processing is not fine enough, and the complex changes of horizontal curves and vertical curves are not fully combined; the use of box girder entity structure parameters is not deep enough, especially the influence of the relationship between the support center and the axis position on the erection has not been effectively explored; factors such as cushion stone elevation, support center coordinates and bridge accessory facility stagger amount are not systematically integrated into the erection control process, making it difficult to achieve high-precision plane and elevation control during the girder falling process, and problems such as box girder linear deviation and unsightly installation of accessory facilities are likely to occur, thereby affecting the overall quality of the bridge. SUMMARY

[0004] The purpose of the present application is to provide a high-precision erection digital control method for a box girder, which comprehensively considers various geometric parameters, constructs a lightweight three-dimensional simulation model driven by parameters, accurately calculates the girder falling deviation, and generates an optimized erection scheme, thereby effectively solving the problems of insufficient precision and poor aesthetics in existing box girder erection technology.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A high-precision erection digital control method for a box girder, comprising the following steps:

[0007] S1, linear element data acquisition: accurately extracting detailed parameter information of horizontal curves and vertical curves from bridge design files; for horizontal curves, recording curve radius, easement curve length, center coordinates, starting point and ending point mileage, etc.; for vertical curves, obtaining parameters such as slope change point mileage, elevation, front and rear slope gradient, and vertical curve radius; store these data as a specific data structure for subsequent calculation and model construction;

[0008] S2. Measurement of Box Girder Entity Parameters: High-precision measuring instruments are used to measure the geometric dimensions of each structure of the currently erected box girder entity, including beam length, beam width, beam height, and web thickness. Simultaneously, the relative positional relationships between each structure are determined, with a focus on measuring and recording the relative position coordinates of the support centers and the axial position coordinates of the box girder entity. These data are then integrated into a box girder entity parameter dataset to provide a basis for accurately placing the box girder in the 3D simulation model.

[0009] S3. Pad Stone Parameter Acquisition: Measure the elevation data of the pad stone and obtain the precise coordinates of the center of the pad stone support; store the pad stone elevation data as an elevation array and the center coordinates of the pad stone support as a coordinate point array to ensure the accuracy and integrity of the data so that the influence of the pad stone factor on the beam drop can be considered in subsequent calculations.

[0010] S4. Measurement of bridge deck ancillary facilities: For prefabricated bridge deck ancillary facilities such as the "three walls", measure the misalignment data at different locations and store it as a misalignment array; these data will be used to simulate the actual installation of the ancillary facilities in the three-dimensional simulation model in order to achieve the purpose of beautifying the bridge deck ancillary facilities;

[0011] S5. Integration of Design Alignment Elements: Integrate other elements in the design alignment, such as bridge deck width, superelevation setting, and lane location; and combine these design element data with the collected actual measurement data to provide comprehensive parameter support for building a complete three-dimensional simulation model and formulating the erection plan.

[0012] Furthermore, step S1 specifically includes:

[0013] Basic Alignment Framework Generation: Based on the collected horizontal and vertical curve parameters, a mathematical model is used to construct the basic alignment framework of the bridge in three-dimensional space. For the horizontal curve section, the coordinates of each point are calculated using the horizontal curve coordinate calculation formula. For example, the coordinates of each point are calculated using the formula for calculating the tangent angle of the transition curve in the transition curve section, and the coordinates of a point inside the circular curve are determined using the formula for calculating the coordinates of a point inside the circular curve in the circular curve section, thus generating the curve trajectory. For the vertical curve, the elevation changes at each mileage are determined according to the vertical curve elevation calculation formula, thereby constructing a three-dimensional alignment profile. The coordinate points of the horizontal and vertical curves are then integrated to form the coordinate point set of the basic alignment framework.

[0014] Furthermore, step S2 specifically includes:

[0015] Box girder solid model fusion: The measured box girder solid parameter data are integrated into the foundation linear frame; according to the relative position coordinates of the support center and the axis position coordinates, the box girder solid model is accurately "placed" in the corresponding position to achieve the matching of the box girder solid and the linear frame; during the placement process, coordinate transformation and position adjustment calculations are performed to ensure that the position of the box girder in the three-dimensional model corresponds to the actual erection position, while considering the influence of the box girder's geometric dimensions and structural relationships on the model.

[0016] Furthermore, step S3 specifically includes:

[0017] Pad Stone Model Integration: Based on the center coordinates and elevation data of the pad stone support, a pad stone model is constructed in the 3D simulation model and connected with the box girder solid model; the position of the box girder in the vertical direction is adjusted to accurately match the pad stone, and the shape, size and connection relationship of the pad stone with the box girder support are considered to further improve the details of the model and enhance its realism and accuracy.

[0018] Furthermore, step S4 specifically includes:

[0019] Adding bridge deck ancillary facilities models: Based on the misalignment data of prefabricated "three walls" and other bridge deck ancillary facilities, the ancillary facilities are modeled in the 3D simulation model and their positions are adjusted; according to the data in the misalignment array, the elevation and planar position of the ancillary facilities are fine-tuned so that they reflect the actual misalignment in the model. This optimizes the installation effect of the bridge deck ancillary facilities and enhances the overall aesthetics of the bridge while ensuring the control of the box girder alignment.

[0020] Furthermore, step S5 specifically includes:

[0021] The plan calculates the horizontal and vertical offsets of the girder placement and, in conjunction with the design alignment, box girder physical parameters, pad stone parameters, and bridge deck ancillary facility parameters, generates an erection scheme that prioritizes alignment control and supplements it with aesthetic enhancements to the bridge deck ancillary facilities. This scheme includes precise position adjustment instructions for girder placement, optimization suggestions for the installation of ancillary facilities, and operational procedures and precautions for the entire erection process, providing detailed guidance for actual box girder erection.

[0022] Furthermore, step S5 also includes:

[0023] The generated erection plan is transmitted to the construction personnel to guide them in the beam lowering operation. During the beam lowering process, the construction personnel use appropriate mechanical equipment to precisely adjust the position of the box girder according to the plane and elevation offset adjustment instructions in the plan, ensuring that the box girder is accurately positioned according to the design requirements. At the same time, according to the optimization suggestions for the installation of ancillary facilities, the prefabricated "three walls" and other bridge deck ancillary facilities are installed to ensure their aesthetics and stability.

[0024] Furthermore, it also includes a quality inspection process after installation, specifically:

[0025] S11. After the box girder is erected, a high-precision measurement robot is used to accurately measure the coordinates of several key feature points that have been pre-set on the erected box girder, and to obtain the measured three-dimensional coordinate data of the feature points. These key feature points include the center point of the box girder end, the mid-span position point, the support installation point, etc. Their positional accuracy directly affects the stress performance and overall alignment of the box girder.

[0026] S12. Simultaneously, a comprehensive scan of the erected box girder is performed using three-dimensional laser scanning technology to obtain point cloud data of the box girder after actual erection. The key feature point data measured by the measurement robot is compared one by one with the theoretical coordinates of the corresponding feature points in the design model. The deviation values ​​of each feature point in the plane position and elevation direction are calculated. Based on the feature point deviation, the deviation of the overall alignment of the box girder is evaluated through data fitting and interpolation algorithms.

[0027] S13. Finally, the point cloud data obtained from the 3D laser scanning is compared and analyzed with the design model to check whether the overall structural dimensions of the box girder, including beam length, beam width, beam height, and cross-sectional dimensions of each part, meet the design requirements. The flatness of the box girder surface can also be further checked by means of curvature analysis of point cloud data.

[0028] Furthermore, by comparing the design alignment with the planar position of the box girder in the current 3D simulation model, the planar offset of the dropped girder is calculated. The specific formula for calculating the planar offset is as follows:

[0029] First, we use the formula: Δx s1 =x s1 -x * s1 Δy s1 =y s1 -y * s1 ; Calculate the deviations of the designed support center coordinates from the actual measured support center coordinates in the x and y directions respectively;

[0030] Then the two-dimensional Euclidean distance formula is used. Calculate the overall planar position deviation;

[0031] Simultaneously, the relative positional deviation of the box girder axis is calculated. Taking into account factors such as support center deviation and axis deviation, a weighted method is used to calculate the plane offset of the girder drop; that is, Δx. drop =ω s ×Δx s1 +ω a ×Δx sa Δy drop =ω s ×Δy s1+ω a ×Δy sa ;

[0032] Where: ω s Weight of the support center deviation, ω a This represents the weight for axis deviation.

[0033] Furthermore, by comparing the elevation requirements of the box girder in the design alignment with the actual elevation of the box girder in the current model, the elevation offset of the dropped girder is calculated. The specific formula for calculating the elevation offset is as follows:

[0034] First, we use the formula: (ΔH) s =H s -H * s ) Calculate the elevation deviation of the bearing pad, formula (Δx) s1 =x s1 -x * s1 Δy s1 =y s1 -y * s1 ) Calculate the deviation between the center coordinates of the bearing pad and the design coordinates, formula: (ΔH) f =H f -H * f Calculate the misalignment of the bridge deck ancillary facilities;

[0035] The elevation offset of the dropped beam is calculated using a weighted method; that is, ΔH. drop =ω sH ×ΔH s +ω fH ×ΔH f ;

[0036] Where: ω sH Weight of elevation deviation of pad stone, ω fH Weighting of misalignment of ancillary facilities.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] I. By accurately collecting detailed parameter information of horizontal and vertical curves and using complex mathematical models to construct a basic three-dimensional linear framework, the design alignment of the bridge in both horizontal and vertical directions can be simulated with remarkable precision. In the construction of horizontal curves, the coordinate points of transition curve segments and circular curve segments are determined using specialized calculation formulas, ensuring the accuracy of the curve trajectory; the changes at each mileage point of the vertical curve are determined based on its elevation calculation formula. The linear framework formed by the integration of these two methods provides a precise spatial reference for the erection of the box girder.

[0039] Second, for prefabricated bridge deck ancillary facilities such as the "three walls" (protective walls, retaining walls, and cable troughs), measuring their misalignment data and modeling and fine-tuning their positions in a 3D simulation model can optimize the installation effect of the ancillary facilities while ensuring the control of the box girder's alignment. In actual construction, following the installation optimization suggestions in the model can make the installation positions of the ancillary facilities more accurate, the appearance neater and more aesthetically pleasing, and consistent with the main structure and overall alignment of the box girder, thus improving the overall aesthetics and quality image of the bridge. It also facilitates the normal functioning of the ancillary facilities, such as the protective effect of the retaining walls and the protection and organization of cables by the cable trough vertical walls.

[0040] Third, by using high-precision measuring instruments to accurately measure the geometric dimensions and relative positions of the various structures of the box girder, especially the precise determination of the relative coordinates of the support centers and the coordinates of the axis, a perfect match between the box girder physical model and the foundation linear frame can be achieved in the 3D simulation model. During the model fusion process, through fine coordinate transformation and position adjustment calculations, the geometric dimensions and structural relationships of the box girder are fully considered, ensuring that the position of the box girder in the model corresponds precisely to the actual erection position. This provides an intuitive and accurate reference for actual girder erection construction, allowing construction personnel to plan construction steps and equipment operating parameters in advance based on the model, reducing on-site adjustments and trial and error, and improving construction efficiency and quality.

[0041] Fourth, the generated erection plan, which prioritizes alignment control and supplements it with aesthetic enhancements to bridge deck ancillary facilities, encompasses precise position adjustment instructions for beam placement, optimized installation suggestions for ancillary facilities, and detailed operational procedures and precautions for the entire erection process. This provides construction personnel with comprehensive and systematic construction guidance. Following the instructions and suggestions in the plan, construction workers can systematically carry out beam erection and ancillary facility installation, avoiding delays and quality issues caused by blind spots and uncertainties in the construction process. For example, during beam placement, adjusting the box girder to the designed position using appropriate machinery based on the horizontal and vertical offset adjustment instructions improves construction efficiency. During ancillary facility installation, following the optimized suggestions ensures installation quality and aesthetics, reducing subsequent rectification and maintenance costs.

[0042] V. Quality Inspection Steps After Erection Further Ensure the Construction Quality of the Bridge. High-precision measuring robots accurately measure the coordinates of key feature points, and 3D laser scanning technology comprehensively scans the box girder. This allows for a thorough and detailed inspection of the actual erection position, overall alignment deviation, and whether the structural dimensions meet design requirements. Data fitting and interpolation algorithms are used to assess the overall alignment deviation of the box girder based on the deviation of key feature points, and curvature analysis of point cloud data is used to detect the surface flatness of the box girder, providing a scientific and accurate basis for quality assessment. If deviations or quality problems are found, corresponding corrective measures can be taken promptly to ensure the safety and reliability of the bridge, laying a solid foundation for its long-term stable operation. Attached Figure Description

[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 The flowchart of the digital control method for high-precision erection of box girders provided by the present invention is shown below. Detailed Implementation

[0045] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The present invention will be described in detail below with reference to several embodiments.

[0047] Example 1

[0048] like Figure 1 As shown, a digital control method for high-precision erection of box girders includes the following steps:

[0049] S1. Data Acquisition of Linear Elements: Accurately extract detailed parameter information of horizontal and vertical curves from bridge design documents; for horizontal curves, record data such as curve radius, transition curve length, center coordinates, starting point and ending point mileage; for vertical curves, acquire parameters such as slope change point mileage, elevation, slope before and after, and vertical curve radius; store these data in a specific data structure for subsequent calculations and model building.

[0050] S2. Measurement of Box Girder Entity Parameters: High-precision measuring instruments are used to measure the geometric dimensions of each structure of the currently erected box girder entity, including beam length, beam width, beam height, and web thickness. Simultaneously, the relative positional relationships between each structure are determined, with a focus on measuring and recording the relative position coordinates of the support centers and the axial position coordinates of the box girder entity. These data are then integrated into a box girder entity parameter dataset to provide a basis for accurately placing the box girder in the 3D simulation model.

[0051] S3. Pad Stone Parameter Acquisition: Measure the elevation data of the pad stone and obtain the precise coordinates of the center of the pad stone support; store the pad stone elevation data as an elevation array and the center coordinates of the pad stone support as a coordinate point array to ensure the accuracy and integrity of the data so that the influence of the pad stone factor on the beam drop can be considered in subsequent calculations.

[0052] S4. Measurement of bridge deck ancillary facilities: For prefabricated bridge deck ancillary facilities such as the "three walls", measure the misalignment data at different locations and store it as a misalignment array; these data will be used to simulate the actual installation of the ancillary facilities in the three-dimensional simulation model in order to achieve the purpose of beautifying the bridge deck ancillary facilities;

[0053] S5. Integration of Design Alignment Elements: Integrate other elements in the design alignment, such as bridge deck width, superelevation setting, and lane location; and combine these design element data with the collected actual measurement data to provide comprehensive parameter support for building a complete three-dimensional simulation model and formulating the erection plan;

[0054] This high-precision digital control method for box girder erection accurately acquires parameters from various aspects, including alignment elements, the box girder itself, bearing pads, and bridge deck ancillary facilities, constructing a complete data system. This not only highly reproduces the bridge structure and design details in a 3D simulation model, making the box girder erection process visible and precise, and effectively improving the positioning accuracy of girder placement, but also allows for the development of scientific erection plans based on a comprehensive consideration of various factors. This reduces construction blind spots, ensures smooth bridge alignment and structural stability, and simultaneously achieves aesthetically pleasing installation of bridge deck ancillary facilities. It significantly improves the overall construction quality and efficiency of bridges, and promotes bridge construction towards intelligence and precision.

[0055] Specifically, step S1 is as follows:

[0056] Basic Alignment Framework Generation: Based on the collected horizontal and vertical curve parameters, a mathematical model is used to construct the basic alignment framework of the bridge in three-dimensional space. For the horizontal curve section, the coordinates of each point are calculated using the horizontal curve coordinate calculation formula. For example, the coordinates of each point are calculated using the formula for calculating the tangent angle of the transition curve in the transition curve section, and the coordinates of a point inside the circular curve are determined using the formula for calculating the coordinates of a point inside the circular curve in the circular curve section, thus generating the curve trajectory. For the vertical curve, the elevation changes at each mileage are determined according to the formula for calculating the vertical curve elevation, thereby constructing a three-dimensional alignment profile. The coordinate points of the horizontal and vertical curves are then integrated to form the coordinate point set of the basic alignment framework.

[0057] By utilizing the collected horizontal and vertical curve parameters and employing corresponding mathematical models, a three-dimensional framework for the bridge foundation is constructed. Specific calculation formulas for different curve segments are used to determine the coordinates and elevation changes of each point. By integrating these coordinate points into a set, this method can accurately and meticulously reconstruct the bridge's linear outline in three-dimensional space. This provides an accurate and reliable spatial benchmark for subsequent work such as box girder erection, effectively ensuring that the entire bridge construction process closely matches the design requirements and improving the precision and scientific nature of the construction.

[0058] Specifically, step S2 is as follows:

[0059] Box girder solid model fusion: The measured box girder solid parameter data are integrated into the foundation linear frame; the box girder solid model is accurately "placed" in the corresponding position according to the relative position coordinates of the support center and the axis position coordinates to achieve the matching of the box girder solid and the linear frame; during the placement process, coordinate transformation and position adjustment calculations are performed to ensure that the position of the box girder in the three-dimensional model corresponds to the actual erection position, while considering the influence of the box girder's geometric dimensions and structural relationships on the model;

[0060] By integrating the box girder solid model, the measured box girder solid parameter data is incorporated into the foundation linear frame. The box girder solid model is precisely placed according to the coordinates of the support center and axis position to match the linear frame. Through coordinate transformation and position adjustment calculations, the position of the box girder in the model is ensured to match the actual erection position. At the same time, the influence of the box girder's own geometric dimensions and structural relationships on the model is fully considered. This allows the three-dimensional model to truly reflect the actual state of the box girder, providing a realistic, accurate and reliable simulation reference for subsequent construction, and helping to improve the accuracy and quality of construction.

[0061] Specifically, step S3 is as follows:

[0062] Pad stone model integration: Based on the center coordinates and elevation data of the pad stone support, a pad stone model is constructed in the 3D simulation model and docked with the box girder solid model; the position of the box girder in the vertical direction is adjusted to accurately match the pad stone, and the shape, size and connection relationship of the pad stone with the box girder support are considered to further improve the details of the model and enhance its realism and accuracy.

[0063] In the step of integrating the pad stone model, the pad stone model is constructed based on the center coordinates and elevation data of the pad stone support and is connected with the box girder solid model. The vertical position of the box girder is adjusted to achieve accurate matching between the two. At the same time, the shape, size and connection relationship between the pad stone and the box girder support are fully considered to improve the model details, which effectively improves the realism and accuracy of the three-dimensional simulation model, making it more in line with the actual engineering situation and providing a more reliable simulation basis for accurately carrying out the box girder erection and subsequent related construction operations.

[0064] Specifically, step S4 is as follows:

[0065] Adding bridge deck ancillary facilities models: Based on the misalignment data of prefabricated "three walls" and other bridge deck ancillary facilities, the ancillary facilities are modeled in the 3D simulation model and their positions are adjusted; according to the data in the misalignment array, the elevation and planar position of the ancillary facilities are fine-tuned so that they reflect the actual misalignment in the model, thereby optimizing the installation effect of bridge deck ancillary facilities and improving the overall aesthetics of the bridge while ensuring the control of the box girder alignment;

[0066] By adding bridge deck ancillary facilities models, the misalignment data of prefabricated "three walls" and other ancillary facilities are modeled and their positions adjusted. The elevation and planar position of the ancillary facilities are fine-tuned according to the corresponding data to present the actual misalignment. This not only optimizes the installation effect of bridge deck ancillary facilities while ensuring the control of the box girder alignment, but also significantly improves the overall aesthetics of the bridge. This makes the 3D simulation model more consistent with the actual engineering scenario and provides a more intuitive and ideal reference for subsequent high-quality construction.

[0067] Specifically, step S5 is as follows:

[0068] The plan calculates the horizontal and vertical offsets of the girder placement and, in conjunction with the design alignment, box girder body parameters, pad stone parameters, and bridge deck ancillary facility parameters, generates an erection scheme that prioritizes alignment control and supplements it with aesthetic enhancements to the bridge deck ancillary facilities. This scheme includes precise position adjustment instructions for girder placement, optimization suggestions for the installation of ancillary facilities, and operational procedures and precautions for the entire erection process, providing detailed guidance for actual box girder erection.

[0069] By comprehensively calculating the offset between the plane and elevation of the girder placement and taking into full account various parameters such as the design alignment, the box girder structure, the bearing pads, and bridge deck ancillary facilities, the generated erection plan ensures that the box girder alignment matches the design height with precise girder placement position adjustment instructions. It also enhances the aesthetics of the bridge with optimized suggestions for the installation of ancillary facilities and covers detailed operating procedures and precautions. This provides comprehensive, accurate, and highly practical guidance for box girder erection, effectively reducing construction errors and blind spots, significantly improving construction efficiency and quality, and ensuring the stability and overall quality of the bridge structure.

[0070] Specifically, step S5 also includes:

[0071] The generated erection plan is transmitted to the construction personnel to guide them in the beam lowering operation. During the beam lowering process, the construction personnel use the corresponding mechanical equipment to precisely adjust the position of the box girder according to the plane and elevation offset adjustment instructions in the plan, ensuring that the box girder is accurately positioned according to the design requirements. At the same time, according to the optimization suggestions for the installation of ancillary facilities, the prefabricated "three walls" and other bridge deck ancillary facilities are installed to ensure their aesthetics and stability.

[0072] After the generated erection plan is transmitted to the construction personnel, it can effectively guide the beam lowering operation and the installation of bridge deck ancillary facilities. According to the plane and elevation offset adjustment instructions in the plan, the construction personnel use mechanical equipment to precisely adjust the position of the box girder so that it is accurately positioned according to the design requirements. In addition, the installation work of "three walls" and other structures is carried out according to the optimization suggestions for the installation of ancillary facilities. While ensuring that the box girder erection meets the design and the structure is stable, it also ensures the aesthetics and stability of the bridge deck ancillary facilities, thereby improving the overall accuracy and quality of bridge construction and making the construction process more scientific and orderly.

[0073] Example 2

[0074] Based on Example 1, a further step is included: a quality inspection step after installation, specifically as follows:

[0075] S11. After the box girder is erected, a high-precision measurement robot is used to accurately measure the coordinates of several key feature points that have been pre-set on the erected box girder, and to obtain the measured three-dimensional coordinate data of the feature points. These key feature points include the center point of the box girder end, the mid-span position point, the support installation point, etc. Their positional accuracy directly affects the stress performance and overall alignment of the box girder.

[0076] S12. Simultaneously, a comprehensive scan of the erected box girder is performed using three-dimensional laser scanning technology to obtain point cloud data of the box girder after actual erection. The key feature point data measured by the measurement robot is compared one by one with the theoretical coordinates of the corresponding feature points in the design model. The deviation values ​​of each feature point in the plane position and elevation direction are calculated. Based on the feature point deviation, the deviation of the overall alignment of the box girder is evaluated through data fitting and interpolation algorithms.

[0077] S13. Finally, the point cloud data obtained by the three-dimensional laser scanning is compared and analyzed with the design model to check whether the overall structural dimensions of the box girder, including beam length, beam width, beam height and cross-sectional dimensions of each part, meet the design requirements. The flatness of the box girder surface can also be further checked by means of curvature analysis of point cloud data.

[0078] After the box girder is erected, high-precision measuring robots and 3D laser scanning technology are used to acquire measured coordinate data of key feature points and point cloud data of the box girder. By comparing the measured data of key feature points with the theoretical coordinates of the design, the deviation value is calculated, and the overall alignment deviation is evaluated. At the same time, the point cloud data and the design model are compared and analyzed in detail to check whether the structural dimensions of the box girder meet the standards and to examine the surface flatness using curvature analysis and other methods. In this way, the actual erection of the box girder can be fully and accurately grasped to a certain extent as to meet the design requirements, and potential problems can be identified in a timely manner. This provides a reliable basis for ensuring the quality of the bridge and ensuring its stress performance and good overall alignment.

[0079] Example 3

[0080] By comparing the designed alignment with the planar position of the box girder in the current 3D simulation model, the planar offset of the dropped girder is calculated. The specific formula for calculating the planar offset is as follows:

[0081] First, we use the formula: Δx s1 =x s1 -x * s1 Δy s1 =y s1 -y * s1 ; Calculate the deviations of the designed support center coordinates from the actual measured support center coordinates in the x and y directions respectively;

[0082] Then the two-dimensional Euclidean distance formula is used. Calculate the overall planar position deviation;

[0083] Simultaneously, the relative positional deviation of the box girder axis is calculated. Taking into account factors such as support center deviation and axis deviation, a weighted method is used to calculate the plane offset of the girder drop; that is, Δx. drop =ω s ×Δx s1 +ω a ×Δx sa Δy drop =ω s ×Δy s1 +ω a ×Δy sa ;

[0084] Where: ω s Weight of the support center deviation, ωa This represents the weight for axis deviation.

[0085] When calculating the plane offset of the box girder, a weighted approach is adopted, taking into account both the support center deviation and the axis deviation. This not only accurately reflects the positional deviation of the box girder in the plane but also allows for the focus on key factors based on different engineering needs and structural characteristics through reasonable weighting, ensuring that the box girder's position more closely matches the design requirements in the plane. For example, in bridge projects with high requirements for the uniformity of support stress, the weight of the support center deviation can be appropriately increased to prioritize the accuracy of the support position; while in projects with higher requirements for the overall smoothness of the alignment, the weight of the axis deviation can be adjusted to ensure the consistency between the box girder's axis and the design alignment.

[0086] Example 4

[0087] By comparing the elevation requirements of the box girder in the design alignment with the actual elevation of the box girder in the current model, the elevation offset of the dropped girder is calculated. The specific formula for calculating the elevation offset is as follows:

[0088] First, we use the formula: (ΔH) s =H s -H * s ) Calculate the elevation deviation of the bearing pad, formula (Δx) s1 =x s1 -x * s1 Δy s1 =y s1 -y * s1 ) Calculate the deviation between the center coordinates of the bearing pad and the design coordinates, formula: (ΔH) f =H f -H * f Calculate the misalignment of the bridge deck ancillary facilities;

[0089] The elevation offset of the dropped beam is calculated using a weighted method; that is, ΔH. drop =ω sH ×ΔH s +ω fH ×ΔH f ;

[0090] Where: ω sH Weight of elevation deviation of pad stone, ω fH Weighting of misalignment of ancillary facilities.

[0091] The calculation of elevation offset also comprehensively considers multiple factors, including the elevation deviation of the bearing pad, the coordinate deviation of the bearing pad support center, and the misalignment of bridge deck ancillary facilities, and performs a weighted calculation. This allows for a comprehensive consideration of all possible influencing factors when controlling the girder placement elevation, avoiding the accumulation of elevation errors caused by a single factor. This ensures that the erection accuracy of the box girder in the elevation direction matches the design alignment, effectively improving the smoothness and stability of the overall bridge alignment, reducing problems such as vehicle bumps and uneven structural stress caused by alignment deviations, and ultimately increasing the bridge's service life and driving comfort.

[0092] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0093] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention.

[0094] The above are merely preferred embodiments of the present invention. It should be noted that, due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above-mentioned technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A digital control method for high-precision erection of box girders, characterized in that, Includes the following steps: S1. Data Acquisition of Linear Elements: Accurately extract detailed parameter information of horizontal and vertical curves from bridge design documents; for horizontal curves, record their curve radius, transition curve length, center coordinates, starting point and ending point mileage data; for vertical curves, acquire the mileage, elevation, slope of the front and rear slopes, and vertical curve radius parameters of the slope change points; store these data in a specific data structure. S2. Measurement of Box Girder Entity Parameters: High-precision measuring instruments are used to measure the geometric dimensions of each structure of the currently erected box girder entity, including beam length, beam width, beam height, and web thickness; at the same time, the relative positional relationship between each structure is determined, with a focus on measuring and recording the relative position coordinates of the support centers and the axial position coordinates of the box girder entity; these data are then integrated into a box girder entity parameter dataset. S3. Pad Stone Parameter Acquisition: Measure the elevation data of the pad stone and obtain the precise coordinates of the center of the pad stone support; store the pad stone elevation data as an elevation array and the center coordinates of the pad stone support as a coordinate point array to ensure the accuracy and integrity of the data; S4. Bridge Deck Ancillary Facilities Data Measurement: For prefabricated "three-wall" bridge deck ancillary facilities, measure the misalignment data at different locations and store it as a misalignment array; this data will be used to simulate the actual installation of the ancillary facilities in the 3D simulation model; S5. Integration of design alignment elements: Integrate other elements in the design alignment, such as bridge deck width, superelevation setting, and lane location information; And combine these design element data with the collected actual measurement data; Calculate the horizontal and vertical offsets of the beam. By comparing the designed alignment with the planar position of the box girder in the current 3D simulation model, the planar offset of the dropped girder is calculated. The specific formula for calculating the planar offset is as follows: First, use the formula: , ; Calculate the coordinates of the designed support center and the actual measured support center respectively. direction and Directional deviation; Then the two-dimensional Euclidean distance formula is used. Calculate the overall planar position deviation; Simultaneously, the relative positional deviation of the box girder axis is calculated. Taking into account both the support center deviation and the axis deviation, a weighted method is used to calculate the plane offset of the girder drop; that is... = , = ; in: Weights for the center deviation of the support Weight for axis deviation; By comparing the elevation requirements of the box girder in the design alignment with the actual elevation of the box girder in the current model, the elevation offset of the dropped girder is calculated. The specific formula for calculating the elevation offset is as follows: First, use the formula: ( ) Calculate the elevation deviation of the bearing pad, formula ( , ) Calculate the deviation between the center coordinates and design coordinates of the bearing pad, formula: ( Calculate the misalignment of the bridge deck ancillary facilities; The elevation offset of the dropped beam is calculated using a weighted method; that is... = ; in: Weight of foundation stone elevation deviation Weighting of misalignment of ancillary facilities.

2. The digital control method for high-precision erection of box girders according to claim 1, characterized in that, The specific steps of step S1 are as follows: Basic linear frame generation: Based on the collected horizontal and vertical curve parameters, the basic linear frame of the bridge is constructed in three-dimensional space using a mathematical model; for the horizontal curve part, the coordinates of each point are calculated using the horizontal curve coordinate calculation formula, the coordinates of each point are calculated using the transition curve tangent angle calculation formula in the transition curve section, and the coordinates of a point inside the circular curve section are determined using the circular curve coordinate calculation formula to generate the curve trajectory. For vertical curves, the elevation changes at each mileage are determined based on the vertical curve elevation calculation formula, thereby constructing a three-dimensional linear profile. The coordinate points of the horizontal and vertical curves are then integrated to form a set of coordinate points for the basic linear framework.

3. The digital control method for high-precision erection of box girders according to claim 2, characterized in that, Step S2 specifically involves: fusion of the box girder entity model: integrating the measured box girder entity parameter data into the foundation linear frame; accurately "placing" the box girder entity model in the corresponding position according to the relative position coordinates of the support center and the axis position coordinates to achieve matching between the box girder entity and the linear frame; and performing coordinate transformation and position adjustment calculations during the placement process.

4. The digital control method for high-precision erection of box girders according to claim 3, characterized in that, Step S3 specifically involves: Pad stone model integration: Based on the center coordinates and elevation data of the pad stone support, a pad stone model is constructed in the three-dimensional simulation model and connected with the box girder solid model; the position of the box girder in the vertical direction is adjusted to accurately match the pad stone, taking into account the shape, size and connection relationship between the pad stone and the box girder support.

5. The digital control method for high-precision erection of box girders according to claim 1, characterized in that, Step S4 specifically involves: adding bridge deck ancillary facility models: based on the misalignment data of the prefabricated "three-wall" bridge deck ancillary facilities, modeling the ancillary facilities in the three-dimensional simulation model and adjusting their positions; Based on the data in the misalignment array, the elevation and planar position of the auxiliary facilities are fine-tuned to reflect the actual misalignment in the model, thereby optimizing the installation effect of the bridge deck auxiliary facilities while ensuring the control of the box girder alignment.

6. The digital control method for high-precision erection of box girders according to claim 1, characterized in that, Step S5 specifically involves: calculating the plane offset and elevation offset of the girder placement, and combining the design alignment, box girder entity parameters, pad stone parameters, and bridge deck ancillary facility parameters to generate an erection scheme that prioritizes alignment control and supplements it with aesthetic enhancements to the bridge deck ancillary facilities. This scheme includes precise position adjustment instructions for girder placement, installation optimization suggestions for ancillary facilities, and operational procedures and precautions for the entire erection process, providing detailed guidance for actual box girder erection.

7. The digital control method for high-precision erection of box girders according to claim 6, characterized in that, Step S5 further includes: transmitting the generated erection plan to the construction personnel and guiding them to carry out the beam lowering operation; during the beam lowering process, the construction personnel use corresponding mechanical equipment to precisely adjust the position of the box girder according to the plane and elevation offset adjustment instructions in the plan, to ensure that the box girder is accurately positioned according to the design requirements; at the same time, according to the optimization suggestions for the installation of auxiliary facilities, the prefabricated "three-wall" bridge deck auxiliary facilities are installed to ensure their aesthetics and stability.

8. The digital control method for high-precision erection of box girders according to claim 1, characterized in that, It also includes a quality inspection process after installation, specifically: S11. After the box girder is erected, a high-precision measurement robot is used to accurately measure the coordinates of several key feature points pre-set on the erected box girder to obtain the measured three-dimensional coordinate data of the feature points. These key feature points include the center point of the box girder end, the mid-span position point, and the support installation point. Their positional accuracy directly affects the stress performance and overall alignment of the box girder. S12. Simultaneously, a comprehensive scan of the erected box girder is performed using three-dimensional laser scanning technology to obtain point cloud data of the box girder after actual erection. The key feature point data measured by the measurement robot is compared one by one with the theoretical coordinates of the corresponding feature points in the design model. The deviation values ​​of each feature point in the plane position and elevation direction are calculated. Based on the feature point deviation, the deviation of the overall alignment of the box girder is evaluated through data fitting and interpolation algorithms. S13. Finally, the point cloud data obtained from the 3D laser scanning is compared and analyzed with the design model to check whether the overall structural dimensions of the box girder, including the beam length, beam width, beam height, and cross-sectional dimensions of each part, meet the design requirements. The flatness of the box girder surface can also be further checked by the curvature analysis of the point cloud data.

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