A method and device for spatial positioning of corrugated steel webs of a steel-concrete composite box girder

Abstract

The application discloses a kind of steel concrete combination box girder corrugated steel web space positioning method and device, including total station deviation correction, calculate reserved settlement and deflection value, corrugated steel web geometry inspection, corrugated steel web space position positioning.The application effectively eliminates the influence of instrument error on positioning by accurate correction of the deviation of the collimation axis and the ranging axis of the total station, further improves the accuracy of spatial positioning, meets the requirements of bridge construction for high-precision positioning of steel web;Secondly, accurate measurement of geometric surface of steel web is carried out using three-dimensional laser scanning technology before positioning, which can timely find the deformation problem of steel web, and the installation quality of steel web is inspected again after positioning through four-point lofting and one-point inspection, which double guarantees the installation quality of steel web.The whole positioning method is simple and clear in operation process, which can effectively shorten the installation time of steel web and improve the construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of road and bridge engineering construction technology, specifically to a method and device for spatial positioning of the corrugated steel web of a steel-concrete composite box girder. Background Technology

[0002] In bridge construction, concrete possesses excellent compressive strength, but its tensile strength is poor. During normal bridge operation, the concrete in the tension zone is prone to cracking, making it unable to effectively resist external live loads and increasing the dead load burden on the bridge. Steel, on the other hand, is a lightweight and high-strength material with excellent tensile strength and low weight, making it suitable for long-span bridge construction. However, as thin-walled components, steel beams are prone to instability and failure without lateral restraint, resulting in low material utilization, high maintenance costs, and insufficient wind resistance.

[0003] Steel-concrete composite beam bridges utilize shear connectors such as studs and structural steel sections to link the concrete slabs and steel beams into a cohesive whole. This fully leverages the compressive strength of concrete and the tensile strength of steel, effectively preventing concrete cracking and steel beam instability under pressure, significantly improving bridge safety and material utilization. Currently, composite box girders using corrugated steel plates for both sides and concrete slabs for the top and bottom plates are common in engineering projects. Corrugated steel plates are typically custom-made by manufacturers and assembled, hoisted, and installed on-site. However, the spatial positioning of the corrugated steel plates is not only time-consuming but also requires extremely high precision, posing a major challenge to the construction measurement of the corrugated steel web. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for spatial positioning of the corrugated steel web of a steel-concrete composite box girder, so as to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for spatial positioning of the corrugated steel web of a steel-concrete composite box girder includes the following steps:

[0007] S1: Total Station Deviation Correction: Measure the coaxial deviation between the laser rangefinder axis and the crosshair center of the total station, including left-right and up-down deviations, and correct it by adding this deviation to the design spatial coordinates through calculation.

[0008] S2: Calculate the reserved settlement and deflection value: Using monitoring and data analysis, the reserved settlement is obtained by theoretical calculation based on structural mechanics and material mechanics. The spatial coordinates of the design are obtained by software calculation or measurement after spatial geometric calculation or three-dimensional modeling. The reserved settlement is added to the design coordinates, and the coordinates after instrument deviation correction are added for layout measurement.

[0009] S3: Geometric shape inspection of corrugated steel web: The geometry of the corrugated steel web is inspected using a 3D laser scanner. First, the design shape is obtained by modeling in Revit. The corrugated steel web is placed flat on a horizontal concrete plane or erected on its side by a triangular support welded with steel bars. Both sides are scanned and the model is spliced ​​together to coincide with the design shape. The deviation from the design model is checked by the intersection operation of the model. When the maximum deviation is less than the allowable deviation, it is judged as qualified; otherwise, it is corrected or returned to the factory.

[0010] S4: Spatial positioning of corrugated steel web:

[0011] S401: The five-point positioning method is adopted to lay out and measure at the four corners and the center of the steel web. When the four corner points are inconvenient to locate, the position located on the diagonal of the steel web at a distance of 10cm-20cm from the corner points is used as the positioning point.

[0012] S402: Attach the total station's special reflector to the layout position, set the total station's distance measurement model to the reflector model; first lay out the two upper corner points, then lay out the two lower corner points, and finally measure the center position to check whether the steel web is deformed. If the deformation is large, remove the steel web for correction.

[0013] S403: During the layout process, the tower crane is used for coordination and adjustment. Larger deviations are handled by hoisting equipment, while smaller deviations are finely adjusted by mounting brackets and then fixed with screws.

[0014] Furthermore, in S1, for total stations with small deviations, the distance between the instrument's measuring station and the orientation control point and the stakeout point is shortened. When conducting stakeout measurements, the angle calculated by coordinates is added to the deviation correction for stakeout. The deviation directions for left-face and right-face are opposite. At the same time, when selecting stakeout points, it is ensured that the surface of the measuring point is orthogonal to the laser beam of the total station to improve the distance measurement accuracy. If orthogonality is not possible, the stakeout point is reasonably selected according to the position of the total station, and the design coordinates are calculated by actual measurement on site.

[0015] Furthermore, in S4, when selecting the layout position, first use a fine ink line to mark the diagonal line on the corrugated steel web surface on the convex surface of the corrugated steel. Based on the position of the corrugated plate relative to the control point of the total station, reasonably select the convex surface to attach the reflector, measure the distance between the center of the reflector and the diagonal vertex, and calculate the three-dimensional coordinates of the designed position of the reflector.

[0016] Furthermore, during the hoisting and positioning of the corrugated steel web in S403, a tower crane or other hoisting equipment is used to lift the corrugated steel web, and one side is fixed to the completed box girder steel web. After the total station is set up at the measurement control point and positioned with another control point, two points close to the completed box girder side are first laid out according to the layout data. The position is adjusted using the tower crane, and the deviation is no more than 2mm. Otherwise, the layout is repeated with the telescope in both forward and reverse directions. After the position is correct, the fixing screws of the steel web on that side are tightened. Then, the other two points are laid out. For more precise adjustments, a threaded telescopic sleeve device is used to adjust the inner and outer and upper and lower positions of the steel web. Finally, the center position of the steel web is checked. The average value is taken by measuring twice with the telescope in both forward and reverse directions. After adjustment, the position of the steel web is fixed.

[0017] The present invention provides another technical solution: a device for precisely adjusting the position between corrugated steel web tubes, comprising a threaded sleeve, a freely rotatable sleeve, a corrugated steel web, a bottom support plate, and a completed box girder block; the screw rod inside the threaded sleeve can be rotatably screwed in, and the other end can rotate freely in the freely rotatable sleeve. The length is finely adjusted by the thread entering and exiting the sleeve, and the inward or outward or up and down position of the corrugated steel web is adjusted according to the principle of one side of a triangle.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The spatial positioning method and device for corrugated steel web of steel-concrete composite box girder of the present invention significantly improves the positioning accuracy: by accurately correcting the deviation between the line of sight and the distance measuring axis of the total station, the influence of instrument error on positioning is effectively eliminated, further improving the accuracy of spatial positioning and meeting the requirements of high-precision positioning of steel web in bridge construction.

[0020] 2. The spatial positioning method and device for corrugated steel web of steel-concrete composite box girder of the present invention comprehensively ensures the quality of steel web: Before positioning, three-dimensional laser scanning technology is used to accurately measure the geometric surface of steel web, which can detect deformation problems of steel web in time and ensure that the quality of steel web meets the requirements before installation; after positioning, the installation quality of steel web is inspected again by four-point layout and one-point inspection, thus doubly ensuring the installation quality of steel web.

[0021] 3. The spatial positioning method and device for the corrugated steel web of the steel-concrete composite box girder of the present invention improves construction efficiency and safety: The positioning method of the present invention is simple to operate and has a clear process, which can effectively shorten the installation time of the steel web and improve construction efficiency. At the same time, the high-precision positioning and strict quality control also enhance the stability and safety of the bridge structure, laying a solid foundation for the long-term safe operation of the bridge. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the correction of the deviation between the laser ranging axis and the line of sight axis of the total station according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the spatial positioning of the corrugated steel web according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of a threaded retractable sleeve according to an embodiment of the present invention.

[0025] In the diagram: 1. Threaded sleeve; 2. Rotatable sleeve; 3. Corrugated steel web; 4. Tower crane; 5. Base plate; 6. Box girder block; 7. Hanging basket. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0027] In order to effectively improve the spatial positioning accuracy of corrugated steel webs in this embodiment of the invention, a spatial positioning method for corrugated steel webs of steel-concrete composite box girders is provided, including the following steps:

[0028] S1: Total Station Deviation Correction: Measure the coaxial deviation between the total station's laser distance measuring axis and the crosshair center, including left-right and up-down deviations. Correct this deviation by adding it to the design spatial coordinates. Specifically, any total station inevitably has a coaxial deviation between the laser distance measuring axis and the crosshair center. This deviation encompasses both left-right and up-down deviations, typically ranging from a few arcseconds to tens of arcseconds or even larger. In this embodiment, the magnitude and direction of this deviation must be accurately measured before construction. The specific operation includes:

[0029] (1) Set up the prism at a location more than 100m away from the total station on a flat ground. Aim the crosshairs of the total station at the center of the prism, turn on the laser emitter, and record the deviation between the laser pointer position and the center of the prism. If the deviation is large, the instrument needs to be sent to a professional repair department for laser axis calibration. For total stations with small deviations, in addition to shortening the distance between the instrument's measuring station and the orientation control point and the stakeout point, the deviation can also be corrected by adding the calculation to the design spatial coordinates.

[0030] (2) Select the optical centering base for orientation. Before use, check and correct the deviation of the round bubble and the long bubble as well as the centering deviation. When setting up the base, it is also necessary to rotate 180 degrees to observe the size of the round bubble, the long bubble and the centering deviation. If it is less than 1mm, it is qualified. Otherwise, it should be recalibrated on site.

[0031] (3) In actual layout measurement, the angle calculated by coordinates (usually the azimuth angle) is added to the deviation correction for operation. At the same time, it should be noted that the deviation direction is opposite for left and right positions (when left, the vertical angle is between 0 and 180 degrees and the horizontal zenith angle is 90 degrees; when right, the vertical angle is between 180 and 360 degrees and the horizontal zenith angle is 270 degrees).

[0032] (4) To ensure the accuracy of distance measurement, the surface of the measuring point should be orthogonal to the laser beam of the total station as much as possible. If orthogonality cannot be achieved (such as when the total station is set up at the control point on the opposite bank), the layout point should be reasonably selected on the corrugated convex surface according to the position of the total station and the reflector should be attached. The distance between the layout point and the opposite vertex of the steel web should be measured on site, and then the design coordinates should be calculated. After adding the reserved settlement amount and the correction of the deviation between the laser beam of the total station and the line of sight, the layout should be carried out.

[0033] S2: Calculation of Reserved Settlement and Deflection Values: Using monitoring and data analysis, the reserved settlement is theoretically calculated based on structural mechanics and materials mechanics. The spatial coordinates of the design are obtained through software calculations, spatial geometric calculations, or 3D modeling followed by measurement. The reserved settlement is added to the design coordinates, and then the coordinates are corrected for instrument deviation before layout measurement. Specifically, professional monitoring equipment and data analysis methods are used to theoretically calculate data, including the reserved settlement after tensioning, based on the principles of structural mechanics and materials mechanics. This part of the work can be entrusted to a qualified third-party monitoring unit, using specialized software (such as Midis Civil or Bridge Doctor) for precise calculations. The spatial coordinates of the design can be obtained through spatial geometric calculations or 3D modeling (e.g., using the absolute positioning function of a BIM model to query the model's position) followed by measurement. Finally, the reserved settlement is added to the design coordinates, and then the coordinates are corrected for instrument deviation before layout measurement. Note that during layout measurement, only distance measurement requires correction of laser beam deviation. High-precision levels are used for elevation monitoring, and strain gauges are used to monitor stress changes. Data collection frequency was set as follows: data was collected every 3 days in the early stages of construction; daily at key construction nodes (such as before and after concrete pouring and prestressing tensioning); and every 2 days during the phase of increased bridge load. Adjusting the collection frequency flexibly according to the construction progress allows for more accurate capture of structural changes, providing reliable data for calculating the allowable settlement. When using Midis Civil software for analysis, after opening the software, a precise 3D model was first created based on the bridge structural design drawings, including parameters such as the dimensions of the box girder, material properties, and the arrangement of prestressing tendons. Then, the collected monitoring data was input, and an appropriate analysis condition was selected (such as construction phase analysis or service phase analysis). Finally, the calculation module was run, and the software automatically calculated the allowable settlement. Similar detailed step-by-step instructions were also provided for Bridge Doctor software, enabling construction personnel to clearly understand the software operation and improve calculation accuracy.

[0034] S3: Inspection of geometric shape of corrugated steel web: A 3D laser scanner is used to inspect the geometric shape of the corrugated steel web. First, the designed shape is obtained by modeling with Revit. The corrugated steel web is laid flat on a horizontal concrete plane or erected sideways through a triangular support welded by steel bars, both sides are scanned and the model is spliced, and the spliced model is positioned in coincidence with the designed shape. The deviation from the design model is inspected through intersection operation of the models. When the maximum deviation is less than the allowable specified deviation, the product is judged as qualified; otherwise, it shall be corrected or returned to the factory for treatment. Specifically, to ensure the spatial positioning accuracy of the steel web, the appearance and geometric shape of the corrugated steel web must be strictly inspected before installation. In this embodiment, an advanced 3D laser scanner is used for this work: for steel webs with large dimensions, the scanning resolution can be set to 5mm to ensure that geometric shape information can be comprehensively obtained; for steel webs with relatively smooth surfaces, the scanning frequency can be set to 5000 points / second, which can not only ensure scanning efficiency but also meet the accuracy requirements. Meanwhile, the influence of different parameter settings on measurement results is introduced to help operators make adjustments according to actual conditions.

[0035] First, Revit software is used to construct the design shape model of the steel web. Then, the corrugated steel web is laid flat on a horizontal concrete plane, or the corrugated steel web is erected sideways through triangular supports welded by steel bars arranged on both sides, and a 3D laser scanner is used to scan the steel web. After obtaining data of both sides, a complete solid model is spliced. The model is positioned in coincidence with the design shape model, and the deviation from the design model is inspected through intersection operation of the models (that is, the difference obtained by subtracting the design model from the actually measured model). When the maximum deviation is less than the allowable specified deviation, the steel web is judged as qualified; otherwise, the steel web needs to be corrected. If the correction cannot meet the requirements, it shall be returned to the factory for treatment. When the deviation of the steel web exceeds the allowable range, a link for analyzing the cause of the deviation is added in addition to correction or factory return. By checking the transportation process records, storage environment conditions and processing technology documents of the steel web, it is determined whether the deviation is caused by transportation collision, improper storage or processing accuracy problems. According to different causes, targeted preventive measures are taken, such as strengthening protection during transportation, improving the storage environment, and optimizing the processing technology, so as to avoid similar deviations in subsequent steel webs.

[0036] S4: Spatial Positioning of Corrugated Steel Web: Since the surface of the corrugated steel web is corrugated and not planar, as a square whole, determining its spatial position can be achieved by determining the positions of its four corner points (for a planar surface, three points are sufficient). To improve positioning accuracy and check whether the hoisting operation has caused deformation of the steel web, this embodiment of the invention adopts a unique five-point positioning method, namely, laying out and measuring the four corners and center of the steel web. Considering that the four corner points may not be convenient to locate directly, positions 10cm-20cm away from the corner points and located on the diagonal of the steel web are selected as positioning points, with priority given to the corrugated outer protrusions. A total station-specific reflector is attached to the selected layout position (note that reflectors of different total stations are not universal and have additive constant deviations, which should be adjusted according to the actual situation), and the total station distance measurement model is set to the reflector model. During layout, the upper two corner points are laid out first, then the lower two corner points are laid out, and finally the center position (intersection of the diagonals) is measured to check whether the steel web is deformed. If the deformation is large, the steel web is removed for correction. Throughout the entire layout process, the tower crane is required to provide full support and adjustments. For larger deviations, hoisting equipment is used to address them; for smaller deviations, the mounting brackets are used for fine-tuning, and the brackets are then tightened with screws after the adjustments are in place.

[0037] During the layout measurement, the center of the crosshairs is used as the reference, and the collimation error has been corrected. For the center positioning of the reflector of the corrugated steel web, a hoisting device is used to initially move it to a suitable direction (currently, total stations can be set for azimuth orientation and positioning). Then, a threaded telescopic sleeve (such as...) is used. Figure 3 Alternatively, a jack and lever can be used to fine-tune the direction. Then, use a total station to adjust the azimuth angle of the line of sight and the laser beam deviation to correct the laser beam deviation in distance measurement. Then, adjust the distance deviation between the center of the reflector and the instrument. Sometimes this will affect the direction and requires repeated adjustments. Finally, reverse the mirror to check it. The distance measurement also needs to correct the laser beam deviation until the deviation between the forward and reverse mirror layout is less than 2mm.

[0038] To further explain and illustrate the above embodiments, the present invention will be further described in conjunction with the accompanying drawings:

[0039] like Figure 1The diagram illustrates the deviation between the total station's line of sight and the laser beam position. On a flat surface, a prism is set up at a location at least 100m away. The total station's crosshairs are aimed at the prism's center, position A. The laser emitter is then turned on. The laser pointer's position, B, deviates from the prism center. If the prism is reversed, the laser pointer will point to the opposite position, C. For total stations with minor deviations, this can be addressed by shortening the distance between the instrument's measuring station and the orientation control and stakeout points, or by applying deviation corrections. For high-precision surveying, reflectors can be attached to structures and walls at least 100m away. After leveling the total station, the pointer is aimed at the center of the reflector. The laser beam is then turned on. A person marks a point at the center of the laser beam near the reflector with a colored pen. The total station records the horizontal and vertical angles at the center of the reflector. The pointer is then aimed at the marked point, and the horizontal and vertical angles are observed. The angle deviation is calculated and recorded. In stakeout surveying, the angle calculated using coordinates (usually the azimuth) is added to the deviation correction for stakeout measurement.

[0040] Furthermore, such as Figure 2 As shown in the figure, this diagram illustrates the selection of layout points for the corrugated steel web, including the upper left corner point a, upper right corner point c, lower left corner point d, and lower right corner point e. Finally, the center point b is measured to check for deformation of the corrugated steel web. Tower crane 4 is used to pull the corrugated steel web to adjust its position; hanging basket 7 is used to fix the bottom formwork; and the total station is set up at a stable location on the riverbank (position f).

[0041] Furthermore, such as Figure 3 As shown, a device for precisely adjusting the position between corrugated steel web tubes is provided, including a threaded sleeve 1, a freely rotatable sleeve 2, a corrugated steel web 3, a bottom support plate 5, and a completed box girder block 6. The entire device is rotatably screwed into the threaded sleeve 1, and the other end rotates freely in the freely rotatable sleeve 2. By using the threaded sleeve to finely adjust the length, the device adjusts the inward or outward or up and down position of the corrugated steel web 3 according to the principle of one side of a triangle, effectively solving the problem that hoisting equipment cannot make more precise adjustments.

[0042] In summary, the spatial positioning method and device for corrugated steel webs of steel-concrete composite box girders provided by this invention effectively eliminates the influence of instrument errors on positioning by precisely correcting the deviation between the line of sight and the distance measuring axis of the total station, further improving the accuracy of spatial positioning and meeting the high-precision positioning requirements of steel webs in bridge construction. Secondly, before positioning, precise geometric measurements of the steel web surface are performed using three-dimensional laser scanning technology, enabling timely detection of deformation issues and ensuring that the quality of the steel web meets requirements before installation. After positioning, the installation quality of the steel web is inspected again through a four-point layout and one-point inspection method, providing double assurance for the installation quality of the steel web. Furthermore, the positioning method of this invention is simple to operate and has a clear process, effectively shortening the installation time of the steel web and improving construction efficiency. At the same time, the high-precision positioning and strict quality control also enhance the stability and safety of the bridge structure, laying a solid foundation for the long-term safe operation of the bridge.

[0043] Expanding application scenarios:

[0044] (1) Application of different types of bridges

[0045] (1-1) Cross-sea Bridge: Considering the complex marine environment of the cross-sea bridge, including strong winds, wave erosion, and seawater corrosion, additional protective measures are implemented for the total station. Waterproof, windproof, and corrosion-resistant instrument housings are used, and the instruments are regularly cleaned and maintained to ensure normal operation in harsh environments. For the installation of the steel web plates, due to the large span and complex structure of the cross-sea bridge, large floating cranes may be required. A detailed explanation is provided on how to combine the characteristics of the floating cranes, adjust the five-point positioning method and deviation adjustment strategy, and ensure accurate positioning of the steel web plates at sea.

[0046] (1-2) Bridges in Complex Mountainous Terrain: To address the challenges of large terrain undulations and poor visibility in bridge construction in mountainous areas, a drone-assisted surveying method was adopted. High-precision surveying equipment was used on drones to conduct topographic mapping and control point measurements of the bridge construction area, providing more accurate baseline data for total station surveying. Simultaneously, during construction in mountainous areas, the transportation route and storage location of the steel web plates were optimized based on the terrain characteristics, reducing difficulties during transportation and hoisting. During the positioning process, due to limitations in the selection of total station stations, satellite positioning technology (such as GNSS) could be combined with the total station to achieve precise positioning of the steel web plates.

[0047] (2) Application in different construction environments.

[0048] (2-1) High-Temperature Areas: In high-temperature environments, the electronic components of the total station are easily affected by temperature, leading to a decrease in measurement accuracy. Preheating and temperature calibration of the total station before construction are necessary to ensure stable operation in high-temperature environments. For the installation of the steel web, high temperatures cause the steel to expand, increasing the requirements for controlling the installation gap. Based on local temperature variations, a reasonable installation gap should be reserved to avoid installation difficulties and structural deformation caused by steel expansion. Observations should be conducted before sunrise or after sunset.

[0049] (2-2) High-altitude and cold regions: In high-altitude and cold regions, the battery life of the total station is affected by low temperatures, and the instrument surface is prone to frost formation, affecting the measurement line of sight. Cold-resistant batteries and instrument insulation methods are adopted, such as equipping the instrument with a thermal cover and wrapping the battery surface with insulation material. Simultaneously, because low temperatures make steel brittle, the frequency of inspection of the hoisting equipment and mounting brackets is increased during the hoisting and adjustment of the steel web to ensure that their load-bearing capacity meets requirements and to avoid safety accidents. During the positioning process, considering the impact of low temperatures on the dimensions of the steel web, measurement data and positioning parameters are adjusted in a timely manner to ensure the installation accuracy of the steel web.

[0050] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for spatial positioning of the corrugated steel web of a steel-concrete composite box girder, characterized in that, Includes the following steps: S1: Total Station Deviation Correction: Measure the coaxial deviation between the laser rangefinder axis and the crosshair center of the total station, including left-right and up-down deviations, and correct it by adding this deviation to the designed spatial coordinates through calculation. Specifically, the magnitude and direction of this deviation need to be accurately measured before construction; the specific operation includes: S101: On flat ground, set up the prism at a location more than 100m away from the total station. Aim the crosshairs of the total station at the center of the prism, turn on the laser emitter, and record the deviation between the laser pointer position and the center of the prism. If the deviation is large, the instrument needs to be sent to a professional repair department for laser axis calibration. For total stations with small deviations, in addition to shortening the distance between the instrument's measuring station and the orientation control point and the stakeout point, the deviation can also be corrected by calculating and adding the deviation to the designed spatial coordinates. S102: Orientation selection optical centering base. Before use, check and correct the deviation between the round bubble and the long bubble, as well as the centering deviation. When setting up the base, it is also necessary to rotate 180 degrees to observe the size of the round bubble, the long bubble, and the centering deviation. If it is less than 1mm, it is acceptable; otherwise, it must be recalibrated on site. S103: In actual layout measurement, the angle calculated by the designed spatial coordinates is added to the deviation correction for operation. At the same time, it should be noted that the deviation directions of the left and right sides are opposite. S104: To ensure distance measurement accuracy, the surface of the measuring point should be orthogonal to the laser beam of the total station. If orthogonality cannot be achieved, a reasonable layout point should be selected on the corrugated convex surface according to the position of the total station and a reflective sheet should be attached. The distance between the layout point and the diagonal vertex of the steel web should be measured on site. Then, the spatial coordinates of the design should be calculated. After adding the reserved settlement amount and the correction for the deviation between the laser beam of the total station and the line of sight, the layout should be carried out. S2: Calculate the reserved settlement and deflection value: Using monitoring and data analysis, the reserved settlement is obtained by theoretical calculation based on structural mechanics and material mechanics. The spatial coordinates of the design are obtained by software calculation or measurement after spatial geometric calculation or three-dimensional modeling. The reserved settlement is added to the designed spatial coordinates, and the coordinates after instrument deviation correction are added for layout measurement. S3: Geometric shape inspection of corrugated steel web: The geometry of the corrugated steel web is inspected using a 3D laser scanner. First, the design shape is obtained by modeling in Revit. The corrugated steel web is placed flat on a horizontal concrete plane or erected on its side by a triangular support welded with steel bars. Both sides are scanned and the model is spliced ​​together to coincide with the design shape. The deviation between the actual installation position and the theoretical design position of the steel web is checked by the intersection operation of the model. When the maximum deviation is less than the allowable deviation, it is judged as qualified; otherwise, it is corrected or returned to the factory. S4: Spatial positioning of corrugated steel web: S401: The five-point positioning method is adopted to lay out and measure at the four corners and the center of the steel web. When the four corner points are inconvenient to locate, the position located on the diagonal of the steel web at a distance of 10cm-20cm from the corner points is used as the positioning point. S402: Attach the total station reflector to the layout position and set the total station distance measurement model to the reflector model; first lay out the two upper corner points, then lay out the two lower corner points, and finally measure the center position to check whether the steel web is deformed. If the deformation is large, remove the steel web for correction. S403: During the layout process, the tower crane is used for coordination and adjustment. The deviation between the actual installation position of the steel web plate and the theoretical design position is checked. Larger deviations are handled by hoisting equipment, and smaller deviations are finely adjusted by the installation bracket. After adjustment, the screws are fixed.

2. The spatial positioning method for the corrugated steel web of a steel-concrete composite box girder as described in claim 1, characterized in that: For total stations with small deviations in S1, the distance between the instrument's measuring station and the orientation control point and the stakeout point is shortened. When conducting stakeout measurements, the angle calculated by coordinates is added to the deviation correction for stakeout. The deviation directions for left and right faces are opposite. At the same time, when selecting stakeout points, it is ensured that the surface of the measuring point is orthogonal to the laser beam of the total station to improve the distance measurement accuracy. If orthogonality is not possible, the stakeout point is reasonably selected according to the position of the total station, and the spatial coordinates of the design are calculated by actual measurement on site.

3. The spatial positioning method for the corrugated steel web of a steel-concrete composite box girder as described in claim 1, characterized in that: In S4, when selecting the layout position, first use a fine ink line to mark the diagonal line on the corrugated steel web surface and mark it on the convex surface of the corrugated steel. Based on the position of the corrugated plate relative to the control point of the total station, reasonably select the convex surface to attach the reflector, measure the distance between the center of the reflector and the diagonal vertex, and calculate the three-dimensional coordinates of the designed position of the reflector.

4. The spatial positioning method for the corrugated steel web of a steel-concrete composite box girder as described in claim 1, characterized in that: During the hoisting and positioning of the corrugated steel web of S403, a tower crane or other hoisting equipment is used to lift the corrugated steel web, and one side is fixed to the completed box girder steel web. After the total station is set up at the measurement control point and positioned with another control point, two points close to the completed box girder side are first laid out according to the layout data. The position is adjusted using the tower crane, and the deviation should not exceed 2mm. Otherwise, the layout is repeated with the telescope in both forward and reverse directions. After the position is correct, the fixing screws of the steel web on that side are tightened. Then, the other two points are laid out. For more precise adjustments, a threaded telescopic sleeve device is used to adjust the inner and outer and upper and lower positions of the steel web. Finally, the center position of the steel web is checked. The average value is taken by measuring twice with the telescope in both forward and reverse directions. After adjustment, the position of the steel web is fixed.

5. A device for precisely adjusting the position between corrugated steel web tubes, applied to the spatial positioning method of corrugated steel web of a steel-concrete composite box girder as described in claim 4, characterized in that... It includes a threaded sleeve (1), a freely rotatable sleeve (2), a corrugated steel web (3), a bottom support plate (5), and a completed box girder block (6); the screw rod inside the threaded sleeve (1) can be rotatably screwed in, and the other end can rotate freely in the freely rotatable sleeve (2). The length can be adjusted by the threaded sleeve, and the corrugated steel web (3) can be adjusted inward, outward, or up and down according to the principle of one side of a triangle.

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