Large-span curved bridge steel box girder manufacturing and mounting method based on BIM technology

Abstract

The invention discloses a large-span curved bridge steel box girder manufacturing and mounting method based on a BIM (Building Information Modeling) technology, aiming at a curved bridge steel box girder with a facade and a plane in irregular curve change at the same time, a full-bridge steel box girder is segmented based on an established full-bridge BIM model, and each segment of steel box girder is respectively supported and subjected to position adjustment through a corresponding assembly jig frame; by determining arrangement parameters of the assembly jig frame and the mounting position relation between the assembly jig frame and the top to-be-assembled steel box girder and automatically adjusting and arranging the assembly jig frame, the mounting position of each section of curved bridge steel box girder can be guaranteed, the welding precision between the adjacent sections of steel box girders can be guaranteed, the space needed by pre-assembly is greatly reduced, and the production efficiency is improved. And the pre-assembling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge superstructure construction, and more specifically, to a method for manufacturing and installing a steel box girder of a long-span curved bridge based on BIM technology. Background Art

[0002] With the rapid development of my country's economy and the improvement of people's living standards, urban bridges are no longer satisfied with the single function of crossing obstacles. More and more cities regard landscape bridges as an important part of improving urban landscape. Curved bridges have smooth lines and beautiful appearances, which are favored by many bridge designers. Steel structures are often used as the upper structure of landscape curved bridges due to their high strength, light weight, good plasticity and toughness, and short construction period. However, complex curves make the processing, manufacturing and installation of steel box girders more difficult.

[0003] Taking the manufacture and installation of steel box girders for river-crossing curved bridges as an example, a long-span curved bridge is a bridge with a single span greater than 100m and irregular curve changes in both the elevation and plane of the bridge. The existing bridge steel box girder manufacturing usually adopts the method of two-dimensional lofting and blanking, segmented prefabrication and on-site assembly for construction, but this solution has the following disadvantages: (1) Poor parts processing accuracy and difficult quality control The steel box girder of a large-span curved bridge presents irregular curves in both the plane and elevation. The existing two-dimensional lofting and cutting technology is to loft the beam body from the plane and elevation dimensions respectively, draw the part drawing, and then input the cutting parameters according to the drawing to control the cutting equipment to cut the steel to generate parts. Since this method uses artificial fitting parameters from two-dimensional lofting to cutting, for beam sections with irregular curves, the produced parts will inevitably have processing errors.

[0004] (2) Pre-assembly takes up a lot of space In order to verify the spatial position of the curved beam section and ensure the elimination of accumulated errors, the entire beam must be pre-assembled at the same time. For large-span curved bridges, if this method is used, a large area will be occupied in the steel structure processing plant, consuming a lot of resources.

[0005] (3) On-site installation is difficult Due to the strong three-dimensionality and abstract linear shape of curved beam bridges, the weight of each segment beam is different. The order of assembly of the steel structure up and down, left and right, and front and back, as well as the segment length are extremely important. It is easy to encounter problems such as failure to install due to inadequate division of beam segments or unreasonable installation sequence. Summary of the invention

[0006] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0007] Another object of the present invention is to provide a method for manufacturing and installing steel box girders for large-span curved bridges based on BIM technology, so as to solve the technical problem in the prior art that steel box girders for large-span irregular curved bridges are difficult to install and connect in sections.

[0008] In order to achieve these purposes and other advantages according to the present invention, a method for manufacturing and installing a steel box girder for a long-span curved bridge based on BIM technology is provided, comprising the following steps: S1. Use BIM software to complete the establishment of the BIM 3D model of the entire bridge and the detailed design of parts, and reserve a data export interface for the BIM 3D model; S2. Import the whole bridge BIM model into the construction simulation software, simulate the construction process, and complete the segmentation of the steel box girder; S3. Export parts information from the full bridge BIM model to form a parts list, and export the cutting data after sorting; S4. Input the cutting data into the CNC cutting machine, cut the steel plate, and place the cut parts in categories according to the construction sequence of the full bridge BIM model; S5. According to the size of the steel structure processing site, the steel box beams are divided into several rounds for assembly and welding. Each round contains N sections of steel box beams. The three-dimensional coordinates are established using the full bridge BIM model, and the assembly frame is automatically adjusted and arranged. The beam body is assembled on the frame. The longitudinal seam between the two sections of the beam is not welded. After each round of assembly, the beam body line shape is checked and a section of the steel box beam is retained as a check beam section for checking the beam body line shape in the next round of assembly; S6. Use transportation equipment to transport each segment of the processed steel box girder to the bridge location, and install the steel box girder on site according to the construction plan simulated in step S2.

[0009] Preferably, in step S5, the automatic adjustment and arrangement of the assembly frame is achieved by setting a self-adjusting frame system, which includes a remote control terminal and a plurality of self-adjusting frames arranged at intervals along the length direction of the steel box beam, each of which includes a signal controller and a plurality of vertical adjustment devices and lateral adjustment devices respectively connected to the signal controller in communication, the vertical adjustment device includes a screw-type power jack, a standard vertical pole is arranged on the upper part of the screw-type power jack, the upper part of the standard vertical pole is used to place the pre-assembled beam body, and a screw-type power jack is upwardly arranged There is a vertical laser distance sensor for real-time feedback of the vertical distance to the beam body directly above. The lateral adjustment device includes a track arranged horizontally along the steel box beam assembly and a rail-clamping jack installed on the track. The telescopic end of the rail-clamping jack is connected to the base of the screw-type power jack, which is used to adjust the lateral position of the screw-type power jack along the track direction. The rail-clamping jack is provided with a lateral displacement sensor connected to the signal controller. The lateral displacement sensor feeds back the lateral displacement of the screw-type power jack in real time. All signal controllers are connected to the remote control terminal for communication; The full-bridge BIM model is used through the remote control terminal to establish three-dimensional coordinates, set the structural parameters of the self-adjusting tire frame, calculate the lateral displacement data and vertical distance data that need to be moved, and the signal controller obtains the lateral displacement data and controls the rail-clamping jack to adjust the lateral position of the screw-type power jack. The signal controller obtains the vertical distance data and controls the screw-type power jack to rise or fall to a specified height.

[0010] Preferably, in step S5, the three-dimensional coordinates are established by using the full-bridge BIM model, and the assembly frame is automatically adjusted and arranged, specifically according to the following steps: A1. Determine and preset the longitudinal spacing of the self-adjusting tire frame and the installation height of the vertical laser ranging sensor in the remote control terminal, and simulate the assembly of the steel box girder in an inverted direction; A2. Automatically search the center line of the steel box girder segment and the boundary line between the top plate and the web plates on both sides of the cross section of each self-adjusting tire frame in the full-bridge BIM model according to the longitudinal spacing of the self-adjusting tire frame, set the height midpoint of the steel box girder segment assembled in each round as the zero point, and derive the relative coordinates of the center line of the steel box girder segment and the boundary line between the top plate and the web plates on both sides on the cross section; A3. A set of the vertical adjustment device and the lateral adjustment device is correspondingly arranged directly below the center line of the steel box girder segment, and a set of the vertical adjustment device and the lateral adjustment device is correspondingly arranged at the bottom of the boundary line between the top plate and the web plate on each side. The remote control terminal converts the relative coordinates into relative height and lateral position data in combination with the data of step A1 and transmits them to the signal controller; A4. The signal controller controls the vertical adjustment device and the horizontal adjustment device to move automatically according to the relative height and horizontal position of step A4, so that the vertical adjustment device in the group reaches the specified horizontal position and the specified support height.

[0011] Preferably, checking the beam line shape in step S5 specifically includes the following steps: C1. Place the check beam section reserved in the previous round of assembly on the current round of assembly frame; C2. Check whether there is a gap between each segment of steel box girder assembled in this round and the top of the tire frame. If there is no gap, the linear inspection is passed. If there is a gap but it can be corrected, continue the inspection after correction. If it cannot be corrected, replace the steel box girder parts of the segment; C3. Check and verify whether the gaps between the beam section and the adjacent beam sections are of equal width. If the widths are consistent, the inspection is passed. If the widths are inconsistent, the cuts of the two-section steel box beams are reprocessed according to the beam length.

[0012] Preferably, in step S2, the steel box girder is segmented according to the lifting capacity of the equipment, the weight of the beam body, and the curve change angle of the beam body, and the difference in the division lengths of adjacent segments in the longitudinal bridge direction does not exceed 20%, and the maximum curve angle changes of the steel box girder bodies of adjacent segments in the longitudinal and transverse directions do not exceed 15°, respectively.

[0013] Preferably, in the length direction of the steel box girder, the number and spacing of the self-adjusting tire frames are determined according to the length of the corresponding segmental steel box girder and the number of cross partitions, and no less than 3 self-adjusting tire frames are arranged longitudinally in each segmental steel box girder.

[0014] The present invention includes at least the following beneficial effects: the manufacturing and installation method of the steel box girder of a large-span curved bridge based on BIM technology of the present invention, for the curved bridge steel box girder whose elevation and plane both present irregular curve changes, divides the steel box girder of the whole bridge into sections based on the established BIM model of the whole bridge, and each section of the steel box girder is supported and position-adjusted by the corresponding assembly cradle respectively, and the assembly cradle is automatically adjusted and arranged by determining the layout parameters of the assembly cradle and the installation position relationship between the assembly cradle and the top steel box girder to be assembled, so as to ensure the installation position of each section of the curved bridge steel box girder, ensure the welding accuracy between adjacent sections of the steel box girder, greatly reduce the space required for pre-assembly, and improve the efficiency of pre-assembly, adopt BIM modeling software to model the whole bridge and then deepen the parts, derive the CNC machining code of the whole bridge parts from the BIM model for direct machining, ensure the machining accuracy of the parts, and greatly improve the qualified rate of the parts machining, and simulate the construction process in the BIM model to timely discover possible problems, optimize the beam segmentation and construction organization in advance, and improve the work efficiency of on-site installation.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the workflow of the present invention; Figure 2 It is a schematic diagram of the structure of the steel box girder of the curved bridge of the present invention pre-assembled in the longitudinal section direction; Figure 3 It is a schematic structural diagram of each round of segmental steel box girders in the cross-sectional direction during pre-assembly construction of the present invention; Figure 4 It is a schematic structural diagram of each round of segmental steel box girders in the longitudinal section direction during pre-assembly construction of the present invention; Figure 5 It is a top view structural diagram of each round of segmental steel box beams of the present invention during pre-assembly construction; Figure 6It is a structural schematic diagram of setting the segment angle of the steel box girder in the present invention; Figure markings in the specification: 1. Screw-type power jack, 2. Standard vertical pole, 3. Vertical laser ranging sensor, 4. Rail-clamping jack, 5. Lateral displacement sensor, 6. Track, 7. Signal controller, 8. Segmental steel box girder to be assembled, 9. Check beam section, 10. Self-adjusting cradle system, 11. Boundary line. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0018] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figure 1-5 As shown, the present invention provides a method for manufacturing and installing a steel box girder of a long-span curved bridge based on BIM technology, comprising the following steps: S1. Use BIM software to complete the establishment of the BIM three-dimensional model of the whole bridge and the in-depth design of parts. According to the complexity of the curved bridge steel box girder, select the appropriate BIM modeling software. The selected software should be able to perform in-depth design and statistics on parts, and reserve a data export interface for the BIM three-dimensional model. The accuracy of the established full-bridge BIM model should reach LOD400 or above.

[0020] S2. Import the BIM model of the entire bridge into the construction simulation software, simulate the construction process, and complete the segmentation of the steel box girder.

[0021] S3. Export parts information from the BIM model of the whole bridge to form a parts list. Use intelligent automatic typesetting technology to layout the parts of the whole bridge. After inspection, adjustment and optimization, obtain the part cutting drawing, and automatically convert the cutting drawing into CNC code. After sorting, export the cutting data.

[0022] S4. Input the cutting data into the CNC cutting machine, cut the steel plate, and place the cut parts in categories according to the construction sequence of the full-bridge BIM model. Before cutting the steel plate, select the appropriate cutting method based on the actual conditions such as the plate thickness and steel type. After cutting, check the length, width, and diagonal difference of the parts to ensure that the cut parts are consistent with the BIM model parameters. If there is a deviation, it needs to be corrected until the inspection passes.

[0023] S5. According to the size of the steel structure processing site, the steel box beam is divided into several rounds for assembly and welding. In the length direction, the whole is divided into six rounds. The number of steel box beam segments in each round decreases from the two ends to the middle, that is, the number of segments of the steel box beams spliced ​​in the first and last rounds is more, and the number of segments of the steel box beams in the round close to the middle span area is relatively less. The three-dimensional coordinates are established by using the full bridge BIM model, and the assembly frame is automatically adjusted and arranged. The beam body is assembled on the frame. The longitudinal seam between the two beam sections is not welded. After each round of assembly, the beam body linear shape is checked and a segment of the steel box beam at the junction is reserved as the verification beam segment 9 for checking the beam body linear shape in the next round of assembly. S6. Use transportation equipment to transport each section of the processed steel box girder to the vicinity of the bridge site, and install the steel box girder on site according to the construction plan simulated in step S2.

[0024] The method for manufacturing and installing steel box girders of a large-span curved bridge based on BIM technology of the present invention is aimed at the steel box girders of curved bridges whose facades and planes are both irregularly curved. Based on the established BIM model of the whole bridge, the steel box girders of the whole bridge are segmented, and each segment of the steel box girder is supported and position-adjusted by a corresponding assembly cradle. By determining the layout parameters of the assembly cradle and the installation position relationship between the assembly cradle and the top steel box girder to be assembled, the assembly cradle is automatically adjusted to ensure the installation position of each segment of the curved bridge steel box girder, and the welding accuracy between adjacent segment steel box girders can be ensured, which greatly reduces the space required for pre-assembly and improves the efficiency of pre-assembly. After the overall bridge modeling is performed using BIM modeling software and then the parts are deepened, the CNC machining code of the whole bridge parts is derived from the BIM model for direct machining, which ensures the machining accuracy of the parts and greatly improves the qualified rate of the parts machining. By simulating the construction process in the BIM model, possible problems are discovered in time, the beam segmentation and construction organization are optimized in advance, and the work efficiency of on-site installation is improved.

[0025] In another technical solution, Figure 3-5As shown, in step S5, the automatic adjustment and arrangement of the assembly frame is achieved by setting up a self-adjusting frame system 10, which includes a remote control terminal and a plurality of self-adjusting frames arranged at intervals along the length direction of the steel box beam, each of which includes a signal controller 7 and a plurality of vertical adjustment devices and lateral adjustment devices respectively connected to the signal controller 7 in communication, the vertical adjustment device includes a screw-type power jack 1, a standard vertical pole 2 is arranged on the upper part of the screw-type power jack 1, and the upper part of the standard vertical pole 2 is used to place the pre-assembled beam body, and a vertical adjustment device is arranged upward on the screw-type power jack 1. The laser distance measuring sensor 3 is used to provide real-time feedback of the vertical distance to the beam body directly above. The lateral adjustment device includes a track 6 arranged transversely along the steel box beam assembly and a track-clamping jack 4 installed on the track 6. The telescopic end of the track-clamping jack 4 is connected to the base of the screw-type power jack 1 and is used to adjust the lateral position of the screw-type power jack 1 along the direction of the track 6. The track-clamping jack 4 is provided with a lateral displacement sensor 5 connected to a signal controller 7. The lateral displacement sensor 5 provides real-time feedback of the lateral displacement of the screw-type power jack 1. All signal controllers 7 are connected to the remote control terminal for communication; The full-bridge BIM model is used through the remote control terminal to establish three-dimensional coordinates, set the structural parameters of the self-adjusting tire frame, calculate the lateral displacement data and vertical distance data that need to be moved, and the signal controller 7 obtains the lateral displacement data and controls the rail-clamping jack 4 to adjust the lateral position of the screw-type power jack 1. The signal controller 7 obtains the vertical distance data and controls the screw-type power jack 1 to rise or fall to a specified height.

[0026] Through the remote control terminal, various signal controllers 7 are connected in a coordinated manner. According to the design size, weight parameters, and curve changes of the entire bridge, each steel box girder segment corresponds to multiple sets of self-adjusting tire frames. The self-adjusting tire frames are used to control the connection points corresponding to the upper steel box girder, so as to determine the position of the steel box girder segment assembled on the top of the subsequent vertical adjustment device. The vertical laser ranging sensor 3 measures the straight-line distance between the fixed height as the starting point and the beam body directly above, so as to know whether the beam body here is exactly the same as the corresponding position of the BIM model. Through multiple vertical adjustment devices and transverse adjustment devices in the horizontal direction, the corresponding position designed in the cross-sectional direction of the steel box girder segment can be adjusted independently, and the fixed surface contact is replaced by dynamic point contact to eliminate the size and non-planar angle changes. The vertical adjustment devices are arranged at intervals along the longitudinal direction of the bridge and mainly play a supporting role. The vertical adjustment devices arranged at intervals in the horizontal direction are pushed or pulled back by the top of the connected transverse adjustment device along the track 6, and at the same time play a positioning role. The self-adjusting tire frame system 10 automatically adjusts each time according to the state of the steel box girder segment to be assembled, and completes the splicing of the current steel box girder segment at the top of the vertical adjustment device.

[0027] In another technical solution, Figure 3-5As shown, in step S5, the three-dimensional coordinates are established using the full-bridge BIM model, and the assembly frame is automatically adjusted and arranged, specifically in accordance with the following steps: A1. Determine and preset the longitudinal spacing of the self-adjusting tire frame and the installation height of the vertical laser ranging sensor 3 in the remote control terminal, and simulate the assembly of the steel box girder in an inverted direction. Use the top surface of the top plate of the steel box girder as the support surface for the vertical adjustment device, and calibrate and determine the longitudinal spacing of the vertical adjustment device installed on site and the detection starting point height of the vertical laser ranging sensor 3.

[0028] A2. Automatically search the center line of the steel box girder segment and the boundary line 11 between the top plate and the webs on both sides of the cross section of each self-adjusting cradle in the full-bridge BIM model according to the longitudinal spacing of the self-adjusting cradle, set the height midpoint of the steel box girder segment assembled in each round to zero, and derive the relative coordinates of the center line of the steel box girder segment and the boundary line 11 between the top plate and the webs on both sides on the cross section.

[0029] A3. A set of the vertical adjustment device and the lateral adjustment device is correspondingly arranged directly below the center line of the steel box girder segment, and a set of the vertical adjustment device and the lateral adjustment device is correspondingly arranged at the bottom of the boundary line 11 between the top plate and the web plate on each side, so that in the lateral direction, generally three sets of vertical adjustment devices are arranged, and the remote control terminal converts the relative coordinates combined with the data of step A1 into relative height and lateral position data and transmits them to the signal controller 7.

[0030] A4. The signal controller 7 controls the vertical adjustment device and the horizontal adjustment device to automatically move according to the relative height and horizontal position of step A4, so that the vertical adjustment device in the group reaches the specified horizontal position and the specified support height, thereby completing the pre-positioning of the segmental steel box girder 8 to be assembled.

[0031] In the extension direction of the steel box girder, the BIM model of the whole bridge is analyzed, and the web extension lines and center lines on both sides of the steel box girder are used as the main guide lines for controlling the installation and connection of the steel box girder. The height midpoint of the steel box girder segment assembled in each round is set as the zero point to establish a coordinate system, corresponding to the arrangement of the vertical adjustment device and the horizontal adjustment device, to achieve automated and refined position adjustment of the self-adjusting tire frame system 10.

[0032] In another technical solution, Figure 4 As shown, checking the beam line shape in step S5 specifically includes the following steps: C1. Place the check beam section 9 reserved in the previous round of assembly on the current round of assembly frame.

[0033] C2. Check whether there is a gap between each segment of steel box girder assembled in this round and the top of the tire frame. If there is no gap, the linear inspection passes. If there is a gap but it can be corrected, continue the inspection after correction. If it cannot be corrected, replace the steel box girder parts of the segment.

[0034] C3. Check and verify whether the gap between beam section 9 and the adjacent beam sections is of equal width. If the widths are consistent, the inspection is passed. If the widths are inconsistent, the cuts of the two-section steel box beams are reprocessed according to the beam length.

[0035] In another technical solution, Figure 2 , 4 As shown, in step S2, the steel box girder is segmented according to the lifting capacity of the equipment, the weight of the beam body, and the curve change angle of the beam body. The difference in the division lengths of adjacent segments in the longitudinal direction of the bridge does not exceed 20%, and the maximum curve angle changes of the steel box girder body in the longitudinal and transverse directions of adjacent segments do not exceed 15°, respectively. Segmentation requirements are set to improve segmentation efficiency, while further improving support stability and linear guidance accuracy.

[0036] The biggest difference between a curved bridge and a straight bridge is that the position of the lifting equipment and the lifting boundary conditions of a curved bridge change with the curve. A straight bridge does not require complex calculations and segmented simulations, but needs to be analyzed based on the specific bridge type, such as lifting from both sides to the middle, from the middle to both sides, or from low to high. Different lifting methods are selected, so after the steel box girder is segmented, the full bridge BIM model is imported for three-dimensional simulation.

[0037] Further, combined with Figure 6 As shown in the figure, the segmented section of the steel box girder is an oblique section in the longitudinal direction of the bridge. According to the order of installation, the segmented section of the last section of the beam is an eight-shaped section with a larger top and a smaller bottom in the longitudinal direction of the bridge. The calculation formula of the angle θ between the steel box girder and the vertical plane is: Where α is the angle between the normal line of the segmentation point and the plumb line, h is the height of the steel box girder, in centimeters, ±, if the normal line of the segmentation point is + in the same direction as the first assembled beam segment, and - in the opposite direction, the value 40 can be set as the parameter L, L is the average length from the intersection of the segmentation line and the top and bottom plates to the intersection of the extended line of the segmentation point normal line and the top and bottom plates. Generally, the value 40 is taken to simplify the calculation, and the calculation result of the angle θ meets the quality requirements of lifting and subsequent welding.

[0038] In another technical solution, Figure 3-5 As shown, in the length direction of the steel box girder, the number and spacing of the self-adjusting tire frames are determined according to the length of the corresponding segmental steel box girder and the number of cross partitions. There are no less than 3 self-adjusting tire frames arranged longitudinally in each segmental steel box girder to ensure basic stable support.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for manufacturing and installing a steel box girder for a long-span curved bridge based on BIM technology, characterized in that: The steps include: S1. Use BIM software to complete the establishment of the BIM 3D model of the entire bridge and the detailed design of parts, and reserve a data export interface for the BIM 3D model; S2. Import the whole bridge BIM model into the construction simulation software, simulate the construction process, and complete the segmentation of the steel box girder; S3. Export parts information from the full-bridge BIM model to form a parts list, and export the cutting data after sorting; S4. Input the cutting data into the CNC cutting machine, cut the steel plate, and place the cut parts in categories according to the construction sequence of the full bridge BIM model; S5. According to the size of the steel structure processing site, the steel box beams are divided into several rounds for assembly and welding. Each round contains N sections of steel box beams. The three-dimensional coordinates are established using the full bridge BIM model, and the assembly frame is automatically adjusted and arranged. The beam body is assembled on the frame. The longitudinal seam between the two sections of the beam is not welded. After each round of assembly, the beam body line shape is checked and a section of the steel box beam is retained as a check beam section for checking the beam body line shape in the next round of assembly; S6. Use transportation equipment to transport each section of the processed steel box girder to the bridge location, and install the steel box girder on site according to the construction plan simulated in step S2.

2. The method for manufacturing and installing a steel box girder for a long-span curved bridge based on BIM technology according to claim 1 is characterized in that: In step S5, the automatic adjustment and arrangement of the assembly frame is achieved by setting up a self-adjusting frame system, which includes a remote control terminal and a plurality of self-adjusting frames arranged at intervals along the length direction of the steel box beam, each of which includes a signal controller and a plurality of vertical adjustment devices and lateral adjustment devices respectively connected to the signal controller in communication, the vertical adjustment device includes a screw-type power jack, a standard vertical pole is arranged on the upper part of the screw-type power jack, the upper part of the standard vertical pole is used to place the pre-assembled beam body, and a vertical adjustment device is arranged upward on the screw-type power jack. The laser distance measuring sensor is used to provide real-time feedback of the vertical distance to the beam body directly above. The lateral adjustment device includes a track arranged horizontally along the steel box beam assembly and a track-clamping jack installed on the track. The telescopic end of the track-clamping jack is connected to the base of the screw-type power jack, which is used to adjust the lateral position of the screw-type power jack along the track direction. The track-clamping jack is provided with a lateral displacement sensor connected to the signal controller. The lateral displacement sensor provides real-time feedback of the lateral displacement of the screw-type power jack. All signal controllers are connected to the remote control terminal for communication; The full-bridge BIM model is used through the remote control terminal to establish three-dimensional coordinates, set the structural parameters of the self-adjusting tire frame, calculate the lateral displacement data and vertical distance data that need to be moved, and the signal controller obtains the lateral displacement data and controls the rail-clamping jack to adjust the lateral position of the screw-type power jack. The signal controller obtains the vertical distance data and controls the screw-type power jack to rise or fall to a specified height.

3. The method for manufacturing and installing a steel box girder for a long-span curved bridge based on BIM technology as claimed in claim 2 is characterized in that: In step S5, the three-dimensional coordinates are established using the full-bridge BIM model, and the assembly frame is automatically adjusted and arranged, specifically in accordance with the following steps: A1. Determine and preset the longitudinal spacing of the self-adjusting tire frame and the installation height of the vertical laser ranging sensor in the remote control terminal, and simulate the assembly of the steel box girder in an inverted direction; A2. Automatically search the center line of the steel box girder segment and the boundary line between the top plate and the web plates on both sides of the cross section of each self-adjusting tire frame in the full-bridge BIM model according to the longitudinal spacing of the self-adjusting tire frame, set the height midpoint of the steel box girder segment assembled in each round as the zero point, and derive the relative coordinates of the center line of the steel box girder segment and the boundary line between the top plate and the web plates on both sides on the cross section; A3. A set of the vertical adjustment device and the lateral adjustment device is correspondingly arranged directly below the center line of the steel box girder segment, and a set of the vertical adjustment device and the lateral adjustment device is correspondingly arranged at the bottom of the boundary line between the top plate and the web plate on each side. The remote control terminal converts the relative coordinates into relative height and lateral position data in combination with the data of step A1 and transmits them to the signal controller; A4. The signal controller controls the vertical adjustment device and the horizontal adjustment device to move automatically according to the relative height and horizontal position of step A4, so that the vertical adjustment device in the group reaches the specified horizontal position and the specified support height.

4. The method for manufacturing and installing a steel box girder for a long-span curved bridge based on BIM technology according to claim 1, characterized in that: Checking the beam line shape in step S5 specifically includes the following steps: C1. Place the check beam section reserved in the previous round of assembly on the current round of assembly frame; C2. Check whether there is a gap between each segment of steel box girder assembled in this round and the top of the tire frame. If there is no gap, the linear inspection is passed. If there is a gap but it can be corrected, continue the inspection after correction. If it cannot be corrected, replace the steel box girder parts of the segment; C3. Check and verify whether the gaps between the beam section and the adjacent beam sections are of equal width. If the widths are consistent, the inspection is passed. If the widths are inconsistent, the cuts of the two-section steel box beams are reprocessed according to the beam length.

5. The method for manufacturing and installing a steel box girder for a long-span curved bridge based on BIM technology according to claim 1 is characterized in that: In step S2, the steel box girder is segmented according to the lifting capacity of the equipment, the weight of the beam body, and the curve change angle of the beam body. The difference in the division lengths of adjacent segments in the longitudinal bridge direction does not exceed 20%, and the maximum curve angle changes of the steel box girder bodies of adjacent segments in the longitudinal and transverse directions do not exceed 15°.

6. The method for manufacturing and installing a steel box girder for a long-span curved bridge based on BIM technology as claimed in claim 2 is characterized in that: In the length direction of the steel box girder, the number and spacing of the self-adjusting tire frames are determined according to the length of the corresponding segmental steel box girder and the number of cross partitions, and no less than 3 self-adjusting tire frames are arranged in the longitudinal direction of each segmental steel box girder.

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