Digital control method for high-precision erection of box girder

Abstract

The invention discloses a box girder high-precision erection digital control method, which comprises the following steps: S1, linear element data acquisition; S2, box girder entity parameter measurement; S3, padstone parameter acquisition: measuring the elevation data of padstone, and acquiring the accurate coordinate of the center of a padstone support; padstone elevation data is stored as an elevation array, and the center coordinates of a padstone support are stored as a coordinate array, so that the accuracy and integrity of the data are ensured, and the influence of padstone factors on beam falling is considered in subsequent calculation; s4, bridge deck ancillary facility data measurement: aiming at prefabricated bridge deck ancillary facilities such as three walls, measuring slab staggering quantity data of the bridge deck ancillary facilities at different positions, and storing the slab staggering quantity data as a slab staggering quantity array; the data are used for simulating the actual installation condition of the ancillary facilities in a three-dimensional simulation model so as to achieve the purpose of beautifying the ancillary facilities on the bridge floor; s5, design line shape element integration: integrating other elements in a design line shape, such as bridge deck width, superelevation setting, traffic lane position and other information; and the design element data are combined with the collected actual measurement data, so that comprehensive parameter support is provided for constructing a complete three-dimensional simulation model and formulating an erection scheme.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a high-precision digital control method for erecting a box girder. Background Art

[0002] In modern bridge construction, the erection of box girders is one of the key links. As of 2023, the national railway operating mileage is 159,000 kilometers, of which the high-speed railway operating mileage is 45,000 kilometers. Bridges on newly built high-speed railway lines account for a large proportion, and most bridges use prefabricated box girder erection construction technology, the accuracy of which 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 measurement tools, which is difficult to meet the increasingly high accuracy requirements of bridge construction. With the development of digital technology, the use of software for precise control has become an inevitable trend, but the existing box girder erection control technology still has shortcomings in terms of comprehensive consideration of factors and accuracy of the model. For example, the processing of linear elements is not fine enough, and the complex changes of horizontal and vertical curves are not fully combined; the use of the structural parameters of the box girder entity itself is not in-depth enough, especially the influence of the position relationship between the support center and the axis on the erection has not been effectively explored; factors such as the elevation of the cushion stone, the coordinates of the support center, and the misalignment of the bridge deck ancillary facilities have not been systematically integrated into the erection control process, resulting in difficulty in achieving high-precision plane and elevation control during the beam drop process, and prone to problems such as box girder linear deviation and unsightly installation of ancillary facilities, thus affecting the overall quality of the bridge. Summary of the invention

[0004] The purpose of the present invention is to provide a high-precision digital control method for the erection of a box girder. By comprehensively considering various geometric parameters, a parameter-driven lightweight three-dimensional simulation model is constructed, the beam drop offset is accurately calculated, and an optimized erection plan is generated, thereby effectively solving the problems of insufficient precision and poor aesthetics existing in the existing box girder erection technology.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A high-precision digital control method for erecting a box girder comprises the following steps:

[0007] S1. Linear element data acquisition: Accurately extract detailed parameter information of horizontal curves and vertical curves from the bridge design file; for horizontal curves, record the curve radius, transition curve length, center coordinates, start and end mileage and other data; for vertical curves, obtain parameters such as slope change point mileage, elevation, front and rear slopes, and vertical curve radius; store these data in a specific data structure for subsequent calculation and model construction;

[0008] S2. Box girder entity parameter measurement: Use high-precision measuring instruments to measure the geometric dimensions of the various structures of the currently erected box girder entity, including beam length, beam width, beam height, web thickness, etc. At the same time, determine the relative position relationship between the various structures, and focus on measuring and recording the relative position coordinates of the support center of the box girder entity and the axis position coordinates of the box girder entity; integrate these data into a box girder entity parameter data set to provide a basis for accurately placing the box girder in the 3D simulation model;

[0009] S3, pad stone parameter collection: measure the pad stone elevation data, and obtain the precise coordinates of the pad stone support center; store the pad stone elevation data as an elevation array, and store the pad stone support center coordinates as a coordinate point array to ensure the accuracy and completeness of the data, so as to consider the influence of the pad stone factor on the beam drop in subsequent calculations;

[0010] S4. Bridge deck ancillary facilities data measurement: for prefabricated "three walls" and other bridge deck ancillary facilities, measure the misalignment data at different positions and store them as misalignment arrays; these data will be used to simulate the actual installation of the ancillary facilities in the three-dimensional simulation model 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, lane position and other information; and combine these design element data with the actual measurement data collected to provide comprehensive parameter support for building a complete 3D simulation model and formulating an erection plan.

[0012] Furthermore, the step S1 is specifically as follows:

[0013] Generation of basic linear framework: Based on the collected horizontal and vertical curve parameters, a mathematical model is used to construct the basic linear framework of the bridge in three-dimensional space; for the horizontal curve part, the coordinate calculation formula of the horizontal curve is used, for example, the coordinates of each point are calculated using the calculation formula of the tangent angle of the transition curve in the transition curve segment, and the coordinate calculation formula of a point in the circular curve is used to determine the coordinate points in the circular curve segment to generate the curve trajectory; for the vertical curve, the elevation change at each mileage is determined according to the vertical curve elevation calculation formula, thereby constructing a three-dimensional linear profile; and the coordinate points of the horizontal curve and the vertical curve are integrated to form a set of coordinate points of the basic linear framework.

[0014] Furthermore, the step S2 is specifically as follows:

[0015] Fusion of box girder entity model: Integrate the measured box girder entity parameter data into the basic linear frame; accurately "place" the box girder entity model at 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 entity 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, the step S3 is specifically as follows:

[0017] Integration of pad stone model: 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 vertical position of the box girder 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 authenticity and accuracy.

[0018] Furthermore, the step S4 is specifically as follows:

[0019] Adding the model of bridge deck ancillary facilities: Based on the misalignment data of the prefabricated "three walls" and other bridge deck ancillary facilities, the ancillary facilities are modeled and their positions are adjusted in the 3D simulation model; according to the data in the misalignment array, the elevation and plane position of the ancillary facilities are fine-tuned to reflect the actual misalignment in the model, thereby optimizing the installation effect of the bridge deck ancillary facilities and improving the overall aesthetics of the bridge while ensuring the linear control of the box girder.

[0020] Furthermore, the step S5 is specifically as follows:

[0021] The plane offset and elevation offset of the dropped beam are calculated, and combined with the design line shape, box girder entity parameters, pad stone parameters and bridge deck ancillary facility parameters, an erection plan is generated with line shape control as the main focus and beautification of bridge deck ancillary facilities as the auxiliary focus. The plan includes precise position adjustment instructions for the dropped beam, installation optimization suggestions for ancillary facilities, and operating procedures and precautions for the entire erection process, providing detailed guidance for the actual box girder erection construction.

[0022] Furthermore, the step S5 further includes:

[0023] The generated erection plan is transmitted to the construction personnel to guide them in the beam-dropping operation. During the beam-dropping process, the construction personnel use the corresponding mechanical equipment to accurately 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 as required by the design. 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 the quality inspection steps after the erection is completed, specifically:

[0025] S11. After the box girder is erected, a high-precision measuring robot is used to perform precise coordinate measurement of multiple 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, the support installation point, etc., and their position accuracy directly affects the force performance and overall linear shape of the box girder;

[0026] S12. At the same time, the erected box girder is comprehensively scanned by using 3D laser scanning technology to obtain the point cloud data of the box girder after actual erection; the key feature point data measured by the measuring robot are compared with the theoretical coordinates of the corresponding feature points in the design model one by one, and the deviation value of each feature point in the plane position and elevation direction is calculated. The deviation of the overall line shape of the box girder is evaluated based on the deviation of the feature points through data fitting and interpolation algorithms;

[0027] S13. Finally, the point cloud data obtained by 3D laser scanning is compared and analyzed with the design model to detect 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 detected through means such as curvature analysis of point cloud data.

[0028] Furthermore, the plane position of the box beam in the designed line shape and the current three-dimensional simulation model is compared to calculate the plane offset of the dropped beam. The plane offset calculation formula is specifically as follows:

[0029] First, use the formula: Δx s1 =x s1 -x * s1 , Δy s1 =yx s1 -y * s1 ; Calculate the deviations between the designed support center coordinates and the actually measured support center coordinates in the x-direction and y-direction respectively;

[0030] Then use the two-dimensional Euclidean distance formula Calculate the overall plane position deviation;

[0031] At the same time, the relative position deviation of the box beam axis is calculated, and the factors such as the support center deviation and the axis deviation are comprehensively considered, and the plane offset of the beam is calculated using a weighted method; that is, Δx drop =ω s ×Δx s1 +ω a ×Δx sa , Δy drop =ω s ×Δy s1+ω a ×Δy sa ;

[0032] Where: s is the support center deviation weight, ω a is the axis deviation weight.

[0033] Furthermore, the elevation requirement of the box girder in the design line shape is compared with the actual elevation of the box girder in the current model, and the elevation offset of the dropped beam is calculated. The specific calculation formula of the elevation offset is:

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

[0035] The weighted method is used to calculate the elevation offset of the dropped beam; that is, ΔH drop =ω sH ×ΔH s +ω fH ×ΔH f ;

[0036] Where: sH Pad height deviation weight, ω fH Weight of the misalignment of ancillary facilities.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. By accurately collecting detailed parameter information of horizontal and vertical curves and using complex mathematical models to construct a basic linear framework in three-dimensional space, the designed linear shape of the bridge in plane and elevation can be simulated very accurately. In the construction of horizontal curves, the coordinate points of the transition curve segment and the circular curve segment are determined by special calculation formulas to ensure the accuracy of the curve trajectory; the vertical curve determines the changes at each mileage according to its elevation calculation formula. The linear framework formed by the integration of the two provides an accurate spatial position reference for the erection of box girders.

[0039] Second, for the prefabricated "three walls" and other bridge deck ancillary facilities, by measuring their misalignment data and modeling and fine-tuning their positions in the three-dimensional simulation model, the installation effect of the ancillary facilities can be optimized on the basis of ensuring the linear control of the box girder. In actual construction, according to the installation optimization suggestions in the model, the installation position of the ancillary facilities can be more accurate, the appearance can be more neat and beautiful, and it can be coordinated with the main structure and overall linear shape of the box girder, which improves the overall aesthetics and quality image of the bridge. At the same time, it is also conducive to the normal functioning of the ancillary facilities, such as the protective effect of the protective wall, the protection and arrangement of the cable trough vertical wall on the cable, etc.

[0040] 3. With the help of high-precision measuring instruments, the geometric dimensions and relative position relationships of the various structures of the box girder entity are accurately measured, especially the accurate determination of the relative position coordinates of the support center and the axis position coordinates, so that the perfect matching of the box girder entity model and the basic linear frame can be achieved in the three-dimensional simulation model; in the process of model fusion, through precise coordinate transformation and position adjustment calculation, the geometric dimensions and structural relationships of the box girder are fully considered, so that the position of the box girder in the model accurately corresponds to the actual erection position; this provides an intuitive and accurate reference for the actual beam erection construction. Construction personnel can plan the construction steps and equipment operating parameters in advance based on the model, reduce the number of on-site adjustments and trial and error, and improve construction efficiency and quality.

[0041] 4. The generated erection plan, which is mainly based on linear control and supplemented by beautifying the bridge deck ancillary facilities, covers the precise position adjustment instructions for the dropped beams, optimization suggestions for the installation of ancillary facilities, and detailed operating procedures and precautions for the entire erection process, providing comprehensive and systematic construction guidance for construction personnel; construction personnel can carry out the erection of beams and the installation of ancillary facilities in an orderly manner according to the instructions and suggestions in the plan, avoiding construction delays and quality problems caused by blindness and uncertainty in the construction process; for example, in the beam dropping operation, according to the plane and elevation offset adjustment instructions, the use of corresponding mechanical equipment can quickly and accurately adjust the box beam to the designed position, thereby improving construction efficiency; when installing ancillary facilities, operating in accordance with the optimization suggestions can ensure the installation quality and aesthetics, and reduce the cost of subsequent rectification and maintenance.

[0042] 5. The quality inspection step after the erection is completed further guarantees the construction quality of the bridge. Through the precise coordinate measurement of key feature points by high-precision measuring robots and the comprehensive scanning of the box girder by three-dimensional laser scanning technology, the actual erection position of the box girder, the overall linear deviation and whether the structural dimensions meet the design requirements can be comprehensively and meticulously detected. The overall linear deviation of the box girder is evaluated based on the deviation of key feature points using data fitting and interpolation algorithms, and the surface flatness of the box girder is detected by means of curvature analysis of point cloud data, providing a scientific and accurate basis for quality assessment. If deviations or quality problems are found, corresponding corrective measures can be taken in a timely manner to ensure the safety and reliability of the bridge, laying a solid foundation for the long-term stable operation of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A flowchart of a high-precision digital control method for erecting a box girder provided by the present invention; DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] A number of embodiments are given below to describe the present invention in detail.

[0047] Example 1

[0048] like Figure 1 As shown, a high-precision digital control method for erecting a box girder comprises the following steps:

[0049] S1. Linear element data acquisition: Accurately extract detailed parameter information of horizontal curves and vertical curves from the bridge design file; for horizontal curves, record the curve radius, transition curve length, center coordinates, start and end mileage and other data; for vertical curves, obtain parameters such as slope change point mileage, elevation, front and rear slopes, and vertical curve radius; store these data in a specific data structure for subsequent calculation and model construction;

[0050] S2. Box girder entity parameter measurement: Use high-precision measuring instruments to measure the geometric dimensions of the various structures of the currently erected box girder entity, including beam length, beam width, beam height, web thickness, etc. At the same time, determine the relative position relationship between the various structures, and focus on measuring and recording the relative position coordinates of the support center of the box girder entity and the axis position coordinates of the box girder entity; integrate these data into a box girder entity parameter data set to provide a basis for accurately placing the box girder in the 3D simulation model;

[0051] S3, pad stone parameter collection: measure the pad stone elevation data, and obtain the precise coordinates of the pad stone support center; store the pad stone elevation data as an elevation array, and store the pad stone support center coordinates as a coordinate point array to ensure the accuracy and completeness of the data, so as to consider the influence of the pad stone factor on the beam drop in subsequent calculations;

[0052] S4. Bridge deck ancillary facilities data measurement: for prefabricated "three walls" and other bridge deck ancillary facilities, measure the misalignment data at different positions and store them as misalignment arrays; these data will be used to simulate the actual installation of the ancillary facilities in the three-dimensional simulation model 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, lane location and other information; and combine these design element data with the collected actual measurement data to provide comprehensive parameter support for building a complete 3D simulation model and formulating an erection plan;

[0054] This high-precision digital control method for box girder erection builds a complete data system by accurately acquiring multiple parameters such as linear elements, box girder entities, pad stones and bridge deck ancillary facilities. It can not only highly restore the bridge structure and design details in the three-dimensional simulation model, visualize and accurately calculate the box girder erection process, and effectively improve the accuracy of beam positioning, but also formulate a scientific erection plan based on comprehensive consideration of various factors, reduce construction blindness, ensure smooth bridge lines and stable structures, and at the same time achieve beautiful installation of bridge deck ancillary facilities, significantly improve the overall construction quality and efficiency of the bridge, and promote bridge construction towards intelligence and refinement.

[0055] Specifically, step S1 is as follows:

[0056] Basic linear framework generation: Based on the collected horizontal curve and vertical curve parameters, the basic linear framework 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, for example, the coordinates of each point are calculated using the tangent angle calculation formula of the transition curve in the transition curve section, and the coordinates of a point in the circular curve are determined using the coordinate calculation formula of a circular curve in the circular curve section to generate the curve trajectory; for the vertical curve, the elevation change at each mileage is determined according to the vertical curve elevation calculation formula, thereby constructing a three-dimensional linear profile; and the coordinate points of the horizontal curve and the vertical curve are integrated to form a set of coordinate points of the basic linear framework;

[0057] By utilizing the collected horizontal and vertical curve parameters, and with the help of corresponding mathematical models, the basic linear framework of the bridge is constructed in three-dimensional space. The specific calculation formulas of different curve segments are used to determine the coordinates and elevation changes of each point, and the coordinate points are integrated to form a set. This method can accurately and meticulously restore the linear contour of the bridge in three-dimensional space, providing an accurate and reliable spatial benchmark for subsequent box girder erection and other work, effectively ensuring that the entire bridge construction process is highly consistent with the design requirements, and improving the accuracy and scientificity of the construction.

[0058] Specifically, step S2 is as follows:

[0059] Fusion of box girder entity model: Integrate the measured box girder entity parameter data into the basic linear frame; accurately "place" the box girder entity model at 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 entity 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 3D model corresponds to the actual erection position, while considering the impact of the box girder's geometric dimensions and structural relationships on the model;

[0060] Through the operation of integrating the box girder solid model, the measured box girder solid parameter data is integrated into the basic linear frame, and the box girder solid model is accurately placed according to the coordinates of the support center and the axis position to match the linear frame. In the process, coordinate transformation and position adjustment calculation are used to ensure that the box girder position in the model is consistent with the actual erection position, and the influence of the box girder's own geometric dimensions and structural relationships on the model is fully considered, so that the three-dimensional model can truly reflect the actual state of the box girder, and provide a realistic, accurate and reliable simulation reference for subsequent construction, which helps to improve the accuracy and quality of construction.

[0061] Specifically, step S3 is as follows:

[0062] Integration of pad stone model: Based on the center coordinates and elevation data of the pad stone support, the pad stone model is constructed in the 3D simulation model and connected with the box girder solid model; the vertical position of the box girder 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 the authenticity and accuracy of the model;

[0063] In the process of integrating the pad stone model, the pad stone model is constructed according to the center coordinates and elevation data of the pad stone support and connected with the box girder solid model. The two are accurately matched by adjusting the vertical position of the box girder. At the same time, the shape, size and connection relationship of the pad stone with the box girder support are fully considered to improve the model details, which effectively improves the authenticity and accuracy of the three-dimensional simulation model, making it more in line with the actual engineering conditions, and providing a more reliable simulation basis for the accurate erection of the box girder and subsequent related construction operations.

[0064] Specifically, step S4 is as follows:

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

[0066] By adding operations to the bridge deck ancillary facilities model, modeling is carried out and the position is adjusted according to the misalignment data of the prefabricated "three walls" and other ancillary facilities. The elevation and plane position of the ancillary facilities are fine-tuned according to the corresponding data to present the actual misalignment situation. This not only optimizes the installation effect of the bridge deck ancillary facilities while ensuring the linear control of the box girder, but also significantly improves the overall aesthetics of the bridge, making the three-dimensional simulation model more in line with the actual engineering scene, and providing a more intuitive and ideal reference for subsequent high-quality construction.

[0067] Specifically, step S5 is as follows:

[0068] Calculate the plane offset and elevation offset of the dropped beam, and generate an erection plan based on line shape control and supplemented by beautifying the bridge deck ancillary facilities by combining the design line shape, box beam entity parameters, pad stone parameters and bridge deck ancillary facilities parameters; the plan includes precise position adjustment instructions for dropped beams, installation optimization suggestions for ancillary facilities, and the operation procedures and precautions for the entire erection process, providing detailed guidance for the actual box beam erection construction;

[0069] By comprehensively calculating the plane and elevation offsets of the dropped beams, and taking into account various parameters such as the design line shape, box girder entity, pad stone and bridge deck ancillary facilities, the generated erection plan ensures that the box girder line shape is highly consistent with the design with precise instructions for adjusting the dropped beam position, and improves the aesthetics of the bridge with optimization suggestions for the installation of ancillary facilities. It also covers detailed operating procedures and precautions, providing comprehensive, accurate and highly practical guidance for box girder erection construction, effectively reducing construction errors and blindness, greatly improving construction efficiency and quality, and ensuring the stability of the bridge structure and overall quality.

[0070] Specifically, step S5 also includes:

[0071] The generated erection plan is transmitted to the construction personnel to guide them in the beam dropping operation. During the beam dropping process, the construction personnel use the corresponding mechanical equipment to accurately adjust the position of the box beam according to the plane and elevation offset adjustment instructions in the plan to ensure that the box beam 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 passed to the construction personnel, it can effectively guide the beam dropping operation and the installation of the bridge deck ancillary facilities. The construction personnel adjust the box girder position according to the plane and elevation offset adjustment instructions in the plan, and use mechanical equipment to accurately adjust the box girder position so that it is accurately in place according to the design requirements. In addition, the "three walls" and other installation work are carried out in accordance with the optimization suggestions for the installation of ancillary facilities. While ensuring that the box girder erection complies with the design and the structure is stable, it also ensures the beauty 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] On the basis of Example 1, a quality inspection step is further included after the erection is completed, specifically:

[0075] S11. After the box girder is erected, a high-precision measuring robot is used to perform precise coordinate measurement of multiple 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, the support installation point, etc., and their position accuracy directly affects the force performance and overall linear shape of the box girder;

[0076] S12. At the same time, the erected box girder is comprehensively scanned by using 3D laser scanning technology to obtain the point cloud data of the box girder after actual erection; the key feature point data measured by the measuring robot are compared with the theoretical coordinates of the corresponding feature points in the design model one by one, and the deviation value of each feature point in the plane position and elevation direction is calculated. The deviation of the overall line shape of the box girder is evaluated based on the deviation of the feature points through data fitting and interpolation algorithms;

[0077] S13. Finally, the point cloud data obtained by the 3D laser scanning is compared and analyzed with the design model to detect whether the overall structural dimensions of the box girder, including the length, width, height and cross-sectional dimensions of each part, meet the design requirements. The flatness of the box girder surface can also be further detected by means of curvature analysis of the point cloud data;

[0078] After the box girder is erected, the measured coordinate data of key feature points and the point cloud data of the box girder are obtained with the help of high-precision measurement robots and 3D laser scanning technology. The deviation value is calculated by comparing the measured data of key feature points with the design theoretical coordinates, and then the overall linear deviation is evaluated. At the same time, the point cloud data and the design model are carefully compared and analyzed to detect whether the box girder structure dimensions meet the standards and use curvature analysis and other means to examine the surface flatness. In this way, the actual erection of the box girder can be fully and accurately grasped to what extent it complies with the design requirements, and potential problems can be discovered in a timely manner, providing a reliable basis for ensuring the quality of the bridge and ensuring its stress performance and overall good linear shape.

[0079] Example 3

[0080] Compare the design line shape with the plane position of the box beam in the current three-dimensional simulation model, and calculate the plane offset of the dropped beam. The specific calculation formula of the plane offset is:

[0081] First, use the formula: Δx s1 =x s1 -x * s1 , Δy s1 =yx s1 -y * s1 ; Calculate the deviations between the designed support center coordinates and the actually measured support center coordinates in the x-direction and y-direction respectively;

[0082] Then use the two-dimensional Euclidean distance formula Calculate the overall plane position deviation;

[0083] At the same time, the relative position deviation of the box beam axis is calculated, and the factors such as the support center deviation and the axis deviation are comprehensively considered, and the plane offset of the beam is calculated using a weighted method; that is, Δx drop =ω s ×Δx s1 +ω a ×Δx sa , Δy drop =ω s ×Δy s1 +ω a ×Δy sa ;

[0084] Where: s is the support center deviation weight, ωa is the axis deviation weight.

[0085] When calculating the plane offset of the dropped beam, the center deviation of the support and the axis deviation are comprehensively considered, and a weighted method is adopted, which can not only accurately reflect the position deviation of the box beam in the plane, but also focus on key factors according to different engineering needs and structural characteristics by setting weights reasonably, so that the position of the dropped beam in the plane is more in line with the design requirements. For example, in some bridge projects with high requirements for the uniformity of the force of the support, the weight of the center deviation of the support can be appropriately increased to give priority to the accuracy of the support position; and in projects with higher requirements for the overall linear smoothness, the axis deviation weight can be adjusted to ensure the consistency of the box beam axis with the design linear shape.

[0086] Example 4

[0087] Compare the elevation requirement of the box girder in the design line shape with the actual elevation of the box girder in the current model, and calculate the elevation offset of the dropped beam. The specific calculation formula of the elevation offset is:

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

[0089] The weighted method is used to calculate the elevation offset of the dropped beam; that is, ΔH drop =ω sH ×ΔH s +ω fH ×ΔH f ;

[0090] Where: sH Pad height deviation weight, ω fH Weight of the misalignment of ancillary facilities.

[0091] The calculation of the elevation offset also integrates multiple factors such as the elevation deviation of the cushion stone, the center coordinate deviation of the cushion stone support, and the misalignment of the bridge deck ancillary facilities, and performs weighted calculation. This allows for comprehensive consideration of various possible influencing factors when controlling the elevation of the beam drop, avoiding the accumulation of elevation errors caused by a single factor, thereby ensuring that the erection accuracy of the box girder in the elevation direction is highly consistent with the designed linear shape, effectively improving the smoothness and stability of the overall linear shape of the bridge, reducing vehicle driving bumps and uneven structural stress caused by linear deviation, and improving the service life and driving comfort of the bridge.

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

[0093] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention.

[0094] The above are only preferred embodiments of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A high-precision digital control method for erecting a box girder, characterized in that: The following steps are involved: S1. Linear element data acquisition: Accurately extract detailed parameter information of horizontal curves and vertical curves from the bridge design file; for horizontal curves, record the curve radius, transition curve length, center coordinates, start and end mileage and other data; for vertical curves, obtain parameters such as slope change point mileage, elevation, front and rear slopes, and vertical curve radius; store these data in a specific data structure for subsequent calculation and model construction; S2. Box girder entity parameter measurement: Use high-precision measuring instruments to measure the geometric dimensions of the various structures of the currently erected box girder entity, including beam length, beam width, beam height, web thickness, etc. At the same time, determine the relative position relationship between the various structures, and focus on measuring and recording the relative position coordinates of the support center of the box girder entity and the axis position coordinates of the box girder entity; integrate these data into a box girder entity parameter data set to provide a basis for accurately placing the box girder in the 3D simulation model; S3, pad stone parameter collection: measure the pad stone elevation data, and obtain the precise coordinates of the pad stone support center; store the pad stone elevation data as an elevation array, and store the pad stone support center coordinates as a coordinate point array to ensure the accuracy and completeness of the data, so as to consider the influence of the pad stone factor on the beam drop in subsequent calculations; S4. Bridge deck ancillary facilities data measurement: for prefabricated "three walls" and other bridge deck ancillary facilities, measure the misalignment data at different positions and store them as misalignment arrays; these data will be used to simulate the actual installation of the ancillary facilities in the three-dimensional simulation model to achieve the purpose of beautifying the bridge deck ancillary facilities; S5. Integration of design alignment elements: Integrate other elements in the design alignment, such as bridge deck width, superelevation setting, lane location and other information; These design element data are combined with the actual measurement data collected to provide comprehensive parameter support for building a complete three-dimensional simulation model and formulating an erection plan.

2. A high-precision digital control method for erecting a box girder according to claim 1, characterized in that: The step S1 is specifically as follows: Basic linear framework generation: Based on the collected horizontal curve and vertical curve parameters, the basic linear framework 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, for example, the coordinates of each point in the transition curve segment are calculated using the transition curve tangent angle calculation formula, and the coordinates of a point in the circular curve segment are determined using the coordinate calculation formula of a circular curve, to generate the curve trajectory; For vertical curves, the elevation change at each mileage is determined according to the vertical curve elevation calculation formula, thereby constructing a three-dimensional linear profile; The coordinate points of the horizontal curve and the vertical curve are integrated to form a set of coordinate points of the basic linear framework.

3. A high-precision digital control method for erecting a box girder according to claim 2, characterized in that: The step S2 is specifically as follows: Fusion of box girder entity model: Integrate the measured box girder entity parameter data into the basic linear frame; accurately "place" the box girder entity model at 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 entity 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 3D model corresponds to the actual erection position, while considering the influence of the box girder's geometric dimensions and structural relationships on the model.

4. A high-precision digital control method for erecting a box girder according to claim 3, characterized in that: The step S3 is specifically as follows: Integration of pad stone model: 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 vertical position of the box girder 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 authenticity and accuracy.

5. The high-precision digital control method for erecting a box girder according to claim 1 is characterized in that: The step S4 is specifically as follows: Adding bridge deck ancillary facilities model: Based on the staggered data of prefabricated "three walls" and other bridge deck ancillary facilities, the ancillary facilities are modeled and their positions are adjusted in the 3D simulation model; According to the data in the misalignment array, the elevation and plane position of the ancillary facilities are fine-tuned to reflect the actual misalignment in the model. This optimizes the installation effect of the bridge deck ancillary facilities and improves the overall aesthetics of the bridge while ensuring the linear control of the box girder.

6. A high-precision digital control method for erecting a box girder according to claim 1, characterized in that: The step S5 is specifically as follows: The plane offset and elevation offset of the dropped beam are calculated, and combined with the design line shape, box girder entity parameters, pad stone parameters and bridge deck ancillary facility parameters, an erection plan is generated with line shape control as the main focus and beautification of bridge deck ancillary facilities as the auxiliary focus. The plan includes precise position adjustment instructions for the dropped beam, installation optimization suggestions for ancillary facilities, and operating procedures and precautions for the entire erection process, providing detailed guidance for the actual box girder erection construction.

7. A high-precision digital control method for erecting a box girder according to claim 6, characterized in that: The step S5 further comprises: The generated erection plan is transmitted to the construction personnel to guide them in the beam-dropping operation. During the beam-dropping process, the construction personnel use the corresponding mechanical equipment to accurately 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 as required by the design. 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.

8. The high-precision digital control method for erecting a box girder according to claim 1 is characterized in that: It also includes quality inspection steps after the erection is completed, specifically: S11. After the box girder is erected, a high-precision measuring robot is used to perform precise coordinate measurement of multiple 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, the support installation point, etc., and their position accuracy directly affects the force performance and overall linear shape of the box girder; S12. At the same time, the erected box girder is comprehensively scanned by using 3D laser scanning technology to obtain the point cloud data of the box girder after actual erection; the key feature point data measured by the measuring robot are compared with the theoretical coordinates of the corresponding feature points in the design model one by one, and the deviation value of each feature point in the plane position and elevation direction is calculated. The deviation of the overall line shape of the box girder is evaluated based on the deviation of the feature points through data fitting and interpolation algorithms; S13. Finally, the point cloud data obtained by 3D laser scanning is compared and analyzed with the design model to detect 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 detected through means such as curvature analysis of point cloud data.

9. A high-precision digital control method for erecting a box girder according to claim 6, characterized in that: Compare the design line shape with the plane position of the box beam in the current three-dimensional simulation model, and calculate the plane offset of the dropped beam. The specific calculation formula of the plane offset is: First, use the formula: Δx s1 =x s1 -x * s1 , Δy s1 =yx s1 -y * s1 ; Calculate the deviations between the designed support center coordinates and the actually measured support center coordinates in the x-direction and y-direction respectively; Then use the two-dimensional Euclidean distance formula Calculate the overall plane position deviation; At the same time, the relative position deviation of the box beam axis is calculated, and the factors such as the support center deviation and the axis deviation are comprehensively considered, and the plane offset of the beam is calculated using a weighted method; that is, Δx drop =ω s ×Δx s1 +ω a ×Δx sa , Δy drop =ω s ×Δy s1 +ω a ×Δy sa ; Where: s is the support center deviation weight, ω a is the axis deviation weight.

10. A high-precision digital control method for erecting a box girder according to claim 6, characterized in that: Compare the elevation requirement of the box girder in the design line shape with the actual elevation of the box girder in the current model, and calculate the elevation offset of the dropped beam. The specific calculation formula of the elevation offset is: First, use the formula: (ΔH s =H s -H * s ) Calculate the elevation deviation of the pad stone, formula (Δx s1 =x s1 -x * s1 , Δy s1 =yx s1 -y * s1 ) Calculate the deviation between the center coordinates of the pad stone support and the design coordinates, formula: (ΔH f =H f -H * f ) Calculate the amount of misalignment of the bridge deck ancillary facilities; The weighted method is used to calculate the elevation offset of the dropped beam; that is, ΔH drop =ω sH ×ΔH s +ω fH ×ΔH f ; Where: sH Pad height deviation weight, ω fH Weight of the misalignment of ancillary facilities.

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