One-time manufacturing and forming process for steel box girder and jig frame for manufacturing steel box girder

Abstract

The invention relates to a steel box girder one-time manufacturing and forming process and a jig frame for steel box girder manufacturing, and relates to the technical field of steel box girder manufacturing, the steel box girder one-time manufacturing and forming process comprises the following steps: S1, designing and assembling the jig frame, establishing a measurement control net on the jig frame, and establishing a positioning reference net on the jig frame according to the measurement control net; s2, a plurality of beam sections are synchronously assembled on the jig frame by taking the positioning reference network as a reference, and the spatial position of each beam section is measured and corrected in real time through the measurement control network; and S3, all the beam sections are welded in sequence, and the complete steel box beam is formed. According to the method, accurate positioning of each unit piece and each beam section of the steel box beam is guaranteed in a synchronous assembly and real-time correction mode, and then the final assembly precision of the steel box beam is improved. By means of the process, the problem that installation errors are continuously accumulated due to existing segmented manufacturing and on-site assembling processes can be solved, and the overall linear precision of the finished steel box girder is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of steel box girder manufacturing, and in particular to a one-time manufacturing process for steel box girders and a manufacturing jig. Background Technology

[0002] Steel box girders are widely used in modern bridge engineering due to their advantages such as high load-bearing capacity, large span capacity, light weight, and fast construction speed. In particular, steel box girders have become a major structural form in the construction of long-span bridges such as cross-sea bridges and urban viaducts.

[0003] Currently, due to the massive size of large steel box girders and limitations in transportation, the manufacturing of existing steel box girders generally adopts a "segmented prefabrication and on-site assembly" process. The specific steps of this process are as follows: the various unit components that make up the steel box girder, such as the bottom plate, web plate, top plate, and diaphragms, are manufactured in the factory; then these unit components are transported to the construction site, where construction workers weld and assemble them to finally form a complete steel box girder.

[0004] Because the unit components of the steel box girder, such as the bottom plate, web plate, top plate, and transverse diaphragms, are manufactured separately and transported to the construction site for assembly step by step, manufacturing and installation errors will accumulate continuously during the assembly process. This will eventually lead to an excessive deviation between the overall alignment of the beam segment and the design alignment, or even serious problems such as the inability to close the segments. This will seriously affect the overall accuracy of the final manufactured steel box girder.

[0005] To overcome these problems, the industry has begun to explore more integrated modular prefabrication technology, which involves prefabricating larger beam segments in factories. However, the basic idea is still to divide the beam body into multiple segments, which are then assembled and welded on-site to form a steel box girder. But during the step-by-step assembly and welding of multiple beam segments, installation errors can still accumulate, affecting the overall accuracy of the final manufactured steel box girder. Summary of the Invention

[0006] This application provides a one-time manufacturing process for steel box girders and a jig for manufacturing steel box girders, the purpose of which is to improve the manufacturing precision of steel box girders.

[0007] In the first aspect, the one-time manufacturing process for steel box girders provided in this application adopts the following technical solution: A one-time manufacturing process for steel box girders includes the following steps: S1, designing and assembling a jig, and establishing a measurement control network on the jig, and establishing a positioning reference network on the jig based on the measurement control network; S2, using the positioning reference network as a reference, assembling several beam segments simultaneously on the jig, and measuring and correcting the spatial position of each beam segment in real time through the measurement control network; S3, welding all beam segments in sequence to form a complete steel box girder.

[0008] By adopting the above technical solution, multiple beam segments are matched, assembled, and welded together on a jig in one go. During this process, a measurement control network and positioning reference network covering the jig are established, enabling global, real-time monitoring and precise positioning of all beam segment assembly. This synchronous assembly and real-time correction method ensures accurate positioning of each unit component and beam segment of the steel box girder, thereby improving the assembly accuracy of each beam segment and ultimately the final assembly accuracy of the steel box girder. This process avoids the problem of continuous accumulation of installation errors caused by existing segmented manufacturing and on-site assembly processes, ensuring the overall linear accuracy of the finished steel box girder.

[0009] Optionally, in step S1, the design and assembly of the jig also includes the following steps: determining the longitudinal alignment of the jig based on the bridge alignment values ​​provided in the bridge design and construction drawings and the pre-camber values ​​provided by the design unit; determining the shrinkage deformation of the steel box girder during welding and the deflection deformation caused by its own weight after forming based on three-dimensional modeling and simulation; determining the transverse alignment of the jig through finite element analysis or empirical data calculation; adjusting the jig structure according to the longitudinal and transverse alignments of the jig, and completing the jig assembly.

[0010] By adopting the above technical solution and pre-compensating the longitudinal and transverse alignment of the jig, the inevitable deformation of the steel box girder caused by welding heat and gravity during manufacturing is actively offset. This design ensures that after the steel box girder leaves the jig and reaches a stable state, its final alignment can accurately return to the design target, thereby further improving the final manufacturing accuracy of the steel box girder.

[0011] Optionally, in step S1, establishing a measurement control network further includes the following steps: establishing several measurement control base points outside the tire frame, and setting up measurement equipment at the control measurement base points; establishing a measurement control network covering the entire tire frame area through multi-point intersection measurement of multiple measurement equipment.

[0012] By adopting the above technical solution, a measurement control network that is independent of and covers the jig is established by setting measurement control benchmarks in a stable area outside the jig. This ensures that the measurement control network is not affected by the slight deformation or settlement that may exist in the jig itself. This makes the measurement control network an absolute and stable measurement benchmark, thereby ensuring the accuracy and reliability of real-time correction data. This provides technical support for achieving global precision control and further improves the manufacturing and forming precision of the final steel box girder.

[0013] Optionally, step S2 further includes the following steps: S21. Using the positioning reference network as a reference, position and assemble the base plate units of all several beam segments on the jig, with the several base plate units arranged sequentially along the length direction of the jig; each base plate unit includes two bottom plates, the length direction of which is arranged along the length direction of the jig, and the two bottom plates are arranged parallel and spaced apart along the width direction of the jig; S22. Assemble several inner partitions on the bottom plates, with the inner partitions arranged sequentially along the length direction of the bottom plates; S23. Assemble the inner web plate on one side of the width direction of the bottom plate and the outer web plate on the other side, and assemble the bottom plate, inner partitions, outer web plate, and inner partitions together. S24. Assemble several crossbeam partitions on the inner web plate. The crossbeam partitions are located between two adjacent inner web plates, and the corresponding two inner web plates are positioned and assembled with the crossbeam partitions. The crossbeam partitions are arranged sequentially and spaced apart along the length of the inner web plate. S25. Assemble the side top plate directly above the bottom plate, and position, assemble, and weld the corresponding inner web plate, outer web plate, and box partitions with the corresponding side bottom plate. S26. Assemble the middle top plate directly above the crossbeam partitions, and position, assemble, and weld the corresponding inner web plate, side top plate, and crossbeam partitions with the middle top plate. S27. Assemble the cantilever block on the outside of the outer web plate.

[0014] By adopting the above technical solution, a clear, orderly, and standardized "direct assembly" process is provided. This process starts from the base plate and builds the steel box girder structure layer by layer upwards, conforming to the principles of structural mechanics and helping to ensure structural stability during assembly. Detailed process division makes the precision control targets for each step clear, facilitating quality control and effectively planning the welding sequence, thus helping to control and reduce the impact of welding deformation on the overall alignment. Furthermore, this assembly process ensures that all beam segments are assembled synchronously, rather than in segments, guaranteeing the relative positional accuracy between each unit component within the entire steel box girder, thereby ensuring the final manufacturing precision of the steel box girder.

[0015] Optionally, after step S3, the following steps are also included: dimensional inspection and alignment verification of the steel box girder through a measurement control network.

[0016] By adopting the above technical solution, after the steel box girder is manufactured, a comprehensive geometric dimension and spatial alignment check is carried out on the steel box girder using a measurement control network. This ensures the product quality of the steel box girder before it leaves the factory, provides a reliable accuracy guarantee for subsequent transportation and on-site installation, and forms a complete quality control closed loop from process control to final inspection.

[0017] Secondly, the steel box girder manufacturing jig provided in this application adopts the following technical solution: A jig for manufacturing steel box girders, used in the aforementioned one-time manufacturing process of steel box girders, includes: a base frame, on which a plurality of adjustable lifting frames are arranged in a matrix; each adjustable lifting frame includes a vertical frame, the vertical frame being vertically arranged and its lower end connected to the base frame; each vertical frame has a sliding plate frame on each opposite side along the length of the base frame, the sliding plate frame being slidably connected to the vertical frame, and a lifting drive assembly is provided below each sliding plate frame for driving the corresponding sliding plate frame to move vertically; support plates are spaced apart above the vertical frame, and the sliding plate frame is rotatably connected to the support plates.

[0018] By adopting the above technical solution, the adjustable lifting frame, through the coordinated design of the upright frame, sliding plate frame, lifting drive assembly, and support plate frame, allows the support plate frame to be raised, lowered, and tilted with the cooperation of two lifting drive assemblies. This enables the support plate frame to adapt to the curve of the steel box girder and also to be used for lifting the steel box girder. Therefore, with the cooperation of several adjustable lifting frames, the support surface formed by the coordinated cooperation of all support plate frames can adapt to the curve requirements of the steel box girder. On the one hand, this improves the flexibility of the jig, allowing it to adapt to the production of different steel box girders. On the other hand, this allows the jig to adapt to the curve requirements of the steel box girder, thereby ensuring the manufacturing quality and forming accuracy of the steel box girder.

[0019] Optionally, the base frame includes several columns, which are vertically arranged and connected to the ground at their lower ends. The columns are arranged in a matrix, and a support column is provided between two adjacent columns. The support column is horizontally arranged and its two ends are detachably connected to the corresponding column. The support frame is positioned above the support columns, and its lower end is detachably connected to the corresponding support column.

[0020] By adopting the above technical solution, the structural design of the base frame provides a stable foundation for the adjustable lifting frame. Since the support columns and uprights are detachably connected, the support columns in the corresponding areas can be easily disassembled after the steel box girder is manufactured, providing space for the girder transport vehicle to pass through when a transport channel needs to be established. Furthermore, by freely selecting the support columns to be disassembled, it is easy to establish a transport channel on either side of the base frame, further improving the flexibility of establishing such a channel. Therefore, the base frame design can further enhance the flexibility of the jig.

[0021] Optionally, a movable base plate is provided below the upright frame, and a number of casters are provided on the movable base plate.

[0022] By adopting the above-mentioned technical solution, the coordinated design of the movable base plate and casters facilitates the movement of the adjustable lifting frame. On the one hand, it facilitates the movement of the corresponding adjustable lifting frame during the assembly of the jig, thus simplifying the jig assembly. On the other hand, it facilitates the disassembly and removal of the adjustable lifting frame when establishing the beam transport channel, thereby improving the convenience of establishing the beam transport channel.

[0023] Optionally, a supporting base plate is provided below the upright frame, the supporting base plate is connected to the base frame, the upright frame is slidably connected to the supporting base plate along the width direction of the base frame, and a side push drive assembly is provided on the supporting base plate, the side push drive assembly is used to drive the upright frame to move along the width direction of the base frame.

[0024] By adopting the above technical solution, the coordinated design of the support base plate and the side-push drive assembly enables each adjustable lifting frame to have lateral adjustment capability, allowing the position of the corresponding support plate to be adjusted along the width of the base frame. Based on this design, during the assembly of the steel box girder, after several support plates support the corresponding beam segments, under the synergistic action of several side-push drive assemblies, the corresponding support plates can drive the corresponding beam segments to move along the width of the base frame, thereby facilitating alignment between different beam segments. Furthermore, with the coordination of the side-push drive assembly and the lifting drive assembly, the support plates can be adjusted in both the vertical and width directions of the base frame. This allows the relative distance between the several support plates arranged sequentially along the width of the base frame and the height of each support plate to be coordinated, enabling the several support plates arranged sequentially along the width of the base frame to adapt to the lateral curve of the steel box girder. This further improves the flexibility of the jig and enhances the manufacturing precision of the steel box girder.

[0025] Optionally, a flat frame is provided below the skateboard frame. The flat frame is horizontally positioned and slidably connected to the upright frame in the vertical direction. The skateboard frame abuts against the corresponding flat frame. Several support pads are provided below the flat frame. The several support pads are stacked sequentially in the vertical direction to form a rigid support column. The upper end of the rigid support column abuts against the flat frame, and the lower end abuts against the upright frame.

[0026] By adopting the above technical solution, based on the combined design of the flat frame and rigid support columns, the rigid support columns can provide stable support for the flat frame, and in turn provide stable support for the sliding frame, so that the support plate frame can effectively bear the huge self-weight of the steel box girder, thereby ensuring the stability of the steel box girder on the jig.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. This application achieves one-time manufacturing of steel box girders by simultaneously assembling multiple beam segments on a jig. During this process, a measurement and control network monitors and corrects the manufacturing process in real time, ensuring accurate positioning of each unit and beam segment, thereby improving the assembly accuracy of each segment and ultimately the final assembly accuracy of the steel box girder. This eliminates the cumulative errors in existing segmented prefabrication processes, significantly improving the overall manufacturing accuracy and production efficiency of the steel box girder.

[0028] 2. This application proactively offsets the inevitable deformation of the steel box girder caused by welding heat and gravity during manufacturing by pre-compensating the longitudinal and transverse alignment of the jig. This ensures that the final alignment of the steel box girder can accurately return to the design target after it leaves the jig and reaches a stable state, thereby further improving the manufacturing accuracy of the final steel box girder.

[0029] 3. This application improves the flexibility of the jig by designing its structure to adapt to the curve requirements of the steel box girder, thus enabling the jig to be adapted to the production of different steel box girders and ensuring the manufacturing quality and forming accuracy of the steel box girder. Attached Figure Description

[0030] Figure 1 This is a process flow diagram of Embodiment 1 of this application.

[0031] Figure 2 This is a schematic diagram of step S21 in an embodiment of this application.

[0032] Figure 3 This is a schematic diagram of step S22 in the embodiments of this application.

[0033] Figure 4 This is a schematic diagram of step S23 in the embodiments of this application.

[0034] Figure 5 This is a schematic diagram of step S24 in an embodiment of this application.

[0035] Figure 6 This is a schematic diagram of step S25 in an embodiment of this application.

[0036] Figure 7 This is a schematic diagram of step S26 in an embodiment of this application.

[0037] Figure 8 This is a schematic diagram of step S27 in an embodiment of this application.

[0038] Figure 9 This is a schematic diagram of step S3 in the embodiments of this application.

[0039] Figure 10 This is a schematic diagram of the overall structure of the tire frame in Embodiment 2 of this application.

[0040] Figure 11 This is a schematic diagram of the overall structure of the lifting assembly in the frame of Embodiment 2 of this application.

[0041] Figure 12 This is a schematic diagram of the overall structure of the adjustable lifting frame in Embodiment 2 of this application.

[0042] Figure 13 This is a schematic diagram of the overall structure of the adjustable lifting frame from another perspective of Embodiment 2 of this application.

[0043] In the diagram, 100 is a beam segment; 101 is a base plate unit; 1011 is a bottom plate; 102 is an internal partition plate; 103 is an inner web plate; 104 is an outer web plate; 105 is a crossbeam partition plate; 106 is a side top plate; 107 is a middle top plate; 108 is a cantilever block; 1 is a base frame; 11 is a column; 12 is a support column; 2 is a lifting adjustable frame; 21 is a frame; 22 is a support base plate; 23 is a side push drive assembly; 24 is a sliding plate frame; 25 is a lifting drive assembly; 26 is a support plate frame; 261 is a rotating connecting frame; 27 is a rigid support frame; 271 is the highest position; 272 is the lowest position; 273 is a locking screw hole; 28 is a flat frame; 281 is a locking bolt; 29 is a rigid support column; 291 is a support pad; 210 is a movable base plate; and 2101 is a caster wheel. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1 - Appendix Figure 13 This application will be described in further detail below.

[0045] Example 1: A one-time manufacturing process for steel box girders, referring to... Figure 1 This includes the following steps: S1. Design and assemble the jig, and establish a measurement control network on the jig, and establish a positioning reference network on the jig based on the measurement control network.

[0046] S11. Design and assembly of the frame.

[0047] Specifically, it includes the following steps: S111. Before assembling the jig, design the longitudinal alignment of the jig based on the bridge alignment values ​​provided in the bridge design and construction drawings and the pre-camber values ​​provided by the design unit.

[0048] S112. Based on three-dimensional modeling and simulation, determine the shrinkage deformation of the steel box girder during welding and the deflection deformation caused by its own weight after forming. Design the transverse shape of the jig by finite element analysis or empirical data calculation.

[0049] S113. When assembling the jig, adjust the jig structure according to the longitudinal and transverse lines of the jig, and make the longitudinal and transverse lines of the assembled jig meet the above design requirements, thereby completing the jig assembly.

[0050] Specifically, let's take the fabrication of a steel box girder with a main span of 200 meters and a beam height of 3.5 meters as an example: First, calculate the pre-camber value. According to the design drawings, the design pre-camber of this bridge is L / 1000, which is 200mm. This is the baseline pre-camber value.

[0051] Then, the welding and gravity deformation were simulated and calculated. A precise three-dimensional model of the steel box girder was established using finite element analysis software such as ANSYS or ABAQUS. Physical parameters of the steel, such as the elastic modulus and coefficient of thermal expansion, were input into the model. Based on the three-dimensional model, the circumferential welding process of all beam segments was simulated, and a thermal load was applied to calculate the shrinkage deformation caused by welding. For example, the simulation showed that the maximum downward deflection at mid-span was -35mm. Based on the welding deformation, the self-weight of the steel box girder was applied, and the simulation calculated that the maximum mid-span deflection caused solely by gravity was -80mm.

[0052] Finally, the final jig alignment is determined. Based on the above data, the required reverse deformation value at the highest point of the jig's mid-span is: design pre-camber value + welding shrinkage deformation + gravity deflection deformation = 200mm + 35mm + 80mm = 315mm.

[0053] Similarly, using a similar method, the transverse section of the steel box girder is simulated to calculate the transverse deformation, and the transverse preset curve of the jig is designed accordingly.

[0054] Specifically, based on the settings in step S11, a high-precision, high-rigidity jig with pre-set longitudinal and transverse pre-camber can be established, thus providing a precise physical benchmark for the one-time integral forming of the steel box girder. The pre-set longitudinal and transverse alignments compensate for the deformation of the steel box girder caused by subsequent welding and gravity in advance, ensuring that the alignment accuracy of the final formed steel box girder meets the design requirements.

[0055] S12. Establish a measurement control network.

[0056] Specifically, it includes the following steps: S121. Establish several measurement control benchmarks outside the jig and install measurement equipment at the control measurement benchmarks.

[0057] S122. By using multiple measuring devices to perform multi-point intersection measurements, a measurement control network covering the entire tire frame area is established.

[0058] Specifically, measurement control benchmarks are achieved using measuring platforms or marker platforms, and total stations are used as the measuring equipment. Based on the establishment of the measurement control network, the spatial position and orientation of each unit component of the steel box girder, as well as the overall alignment of the steel box girder, can be detected in real time and accurately during the assembly and manufacturing process. This allows for timely detection and correction of deviations, effectively preventing the accumulation of errors and ensuring the final forming accuracy of the steel box girder.

[0059] S13. Establish a positioning reference network.

[0060] Specifically, it includes the following steps: S131. The longitudinal baseline, transverse baseline, and several reference points of the positioning steel box girder are set on the jig by measuring the control network.

[0061] S132. Establish a positioning reference network based on the set longitudinal baseline, transverse baseline, and several reference points.

[0062] Specifically, based on the establishment of the positioning reference network, a unified physical reference is provided for the installation, positioning and assembly of all subsequent steel box girder unit components, ensuring that each unit component can be accurately installed to its theoretical position.

[0063] S2. Using the positioning reference network as a reference, several beam segments 100 are assembled synchronously on the jig, and the spatial position of each beam segment 100 is measured and corrected in real time through the measurement control network.

[0064] S21. Using the positioning reference network as a reference, a number of base plate units 101 of beam segments 100 are positioned and assembled on the jig. The number of base plate units 101 are arranged sequentially along the length direction of the jig. The base plate unit 101 includes two base plates 1011. The length direction of the base plates 1011 is arranged along the length direction of the jig, and the two base plates 1011 are arranged parallel and spaced apart along the width direction of the jig.

[0065] Specifically, refer to Figure 2 This includes the following steps: S211. Using the positioning reference network as a reference, the prefabricated base plate 1011 is hoisted onto the jig.

[0066] S212. By measuring the control network and using a theodolite, the position of the base plate 1011 is adjusted in real time so that the base plate 1011 is moved to the corresponding position of the jig for positioning and assembly.

[0067] S213. Repeat steps S211-S212 until all the base plate units 101 of the beam segments 100 are assembled onto the jig.

[0068] In this embodiment, under the action of steps S211-S213, the positioning and assembly of the base plate 1011 of all beam segments 100 on the jig is accurately completed, which establishes a longitudinal reference for the subsequent assembly of the entire steel box girder, ensures that the starting position of each beam segment 100 is accurate, and also ensures the accuracy of the relative position between each beam segment 100, thereby reducing the cumulative error that occurs during the subsequent assembly and welding of several beam segments 100.

[0069] S22. Assemble several internal partitions 102 on the base plate 1011. The internal partitions 102 are arranged sequentially along the length of the base plate 1011.

[0070] Specifically, refer to Figure 3 This includes the following steps: S221. Pre-draw the partition positioning lines on the base plate 1011.

[0071] S222. Hoist the internal partition 102 onto the base plate 1011, and use the partition positioning line on the base plate 1011 as a reference to position and assemble the internal partition 102 onto the corresponding position on the base plate 1011.

[0072] S223. Repeat steps S221-S222 until all internal partitions 102 are assembled onto the corresponding base plate 1011.

[0073] In steps S221-S223, the installation accuracy of the internal partition 102 is monitored in real time through a measurement control network, and the spacing between adjacent internal partitions 102 is controlled. The plumbness of the internal partition 102 is measured through the measurement control network and / or a laser plumb bob, ensuring that the internal partition 102 is strictly perpendicular to the corresponding base plate 1011. This guarantees the regularity and dimensional accuracy of the internal structure of the beam segment 100.

[0074] S23. Assemble the inner web plate 103 on one side of the width direction of the base plate 1011 and the outer web plate 104 on the other side. Two adjacent base plates 1011 are located between the corresponding two outer web plates 104 along the width direction of the frame. Weld the corresponding base plates 1011, the inner partition plate 102, the outer web plate 104 and the inner web plate 103.

[0075] Specifically, refer to Figure 4 This includes the following steps: S231. Pre-draw the web position line on the base plate 1011.

[0076] S232. The outer web plate 104 and the inner web plate 103 are hoisted onto the base plate 1011 in sequence. Using the web plate position line on the base plate 1011 as a reference, the inner web plate 103 and the outer web plate 104 are positioned and assembled onto the base plate 1011.

[0077] S233. Weld the fillet welds between the inner partition 102 and the bottom plate 1011, the fillet welds between the inner partition 102 and the outer web plate 104, the fillet welds between the inner partition 102 and the inner web plate 103, the bevel welds between the bottom plate 1011 and the outer web plate 104, and the bevel welds between the bottom plate 1011 and the inner web plate 103 in sequence, and inspect the quality of the welds.

[0078] S234. Repeat steps S231-S233 until all outer web plates 104 and inner web plates 103 are assembled onto the corresponding base plate 1011.

[0079] In steps S231-S234, the impact values ​​of the inner web plate 103 and the outer web plate 104 are controlled by a plumb bob, and the distances of the inner web plate 103 and the outer web plate 104 from the longitudinal baseline of the base plate 1011, the height difference between adjacent inner web plates 103, the height difference between adjacent outer web plates 104, and the height difference between adjacent inner web plates 103 and outer web plates 104 are precisely adjusted by a measurement control network. This ensures the installation accuracy of the inner web plate 103 and the outer web plate 104.

[0080] S24. Assemble several crossbeam partitions 105 on the inner web plate 103. The crossbeam partitions 105 are located between two adjacent inner web plates 103 along the width direction of the frame, and the two corresponding inner web plates 103 are positioned and assembled with the crossbeam partitions 105. The several crossbeam partitions 105 are arranged sequentially at intervals along the length direction of the inner web plate 103.

[0081] Specifically, refer to Figure 5 This includes the following steps: S241. First, mark the diaphragm position lines on the inner web 103.

[0082] S242. Hoist the crossbeam partition 105 between two adjacent inner web plates 103, and use the partition position line on the inner web plate 103 as a reference to position and assemble the crossbeam partition 105 between the corresponding two adjacent inner web plates 103, and assemble the crossbeam partition 105 with the corresponding two inner web plates 103.

[0083] S243. Repeat steps S241-S242 until all beams and partitions 105 are assembled.

[0084] In steps S241-S243, the spacing between two adjacent crossbeam partitions 105 is adjusted using a measurement control network, and the verticality of the crossbeam partitions 105 is adjusted using the measurement control network and / or a laser plumb bob, thereby ensuring the installation accuracy of each crossbeam partition 105. In this step, the crossbeam partitions 105 and the inner web plate 103 are only positioned and assembled, and are not welded at this stage.

[0085] S25. Assemble the side top plate 106 directly above the bottom plate 1011, and position, assemble and weld the corresponding inner web plate 103, outer web plate 104 and box partition 102 to the corresponding side bottom plate 1011.

[0086] Specifically, refer to Figure 6 This includes the following steps: S251. Draw a baseline on the side top plate 106 in advance, and determine the installation position of the side top plate 106 by measuring the positioning reference network.

[0087] S252. Hoist the side top plate 106 directly above the corresponding bottom plate 1011 and adjust the position of the side top plate 106 so that the baseline, measurement control network and positioning reference network on the side top plate 106 are compatible with each other to ensure that the spatial position of the side top plate 106 is accurate. Then assemble the side top plate 106 with the corresponding inner web plate 103, outer web plate 104 and internal partition plate 102.

[0088] S253. Position and weld the side top plate 106 to the inner web plate 103, the outer web plate 104, and the inner partition plate 102.

[0089] S254. Repeat steps S251-S254 until all side top plates 106 are assembled and welded.

[0090] In steps S251-S254, the elevation of the side top plate 106 is controlled by a measurement control network, and the position of the side top plate 106 is adjusted to ensure the verticality of the end face of the corresponding beam segment 100. This ensures the structural contour accuracy of the beam segment 100 and prevents serious damage from the subsequent welding of several beam segments 100. S26. Assemble the intermediate top plate 107 directly above the crossbeam partition 105, and position, assemble and weld the corresponding inner web plate 103, side top plate 106, crossbeam partition 105 and intermediate top plate 107.

[0091] Specifically, refer to Figure 7 This includes the following steps: S261. Draw a baseline on the intermediate top plate 107 in advance, and determine the installation position of the intermediate top plate 107 by means of the positioning reference network and the measurement control network.

[0092] S262. Hoist the intermediate top plate 107 directly above the corresponding crossbeam partition 105, and adjust the position of the side intermediate top plate 107 so that the baseline, measurement control network and positioning reference network on the intermediate top plate 107 are compatible with each other, ensuring that the spatial position of the intermediate top plate 107 is accurate. Then assemble the intermediate top plate 107 with the corresponding side top plate 106, inner web plate 103 and crossbeam partition 105.

[0093] S263. Weld the butt joint between the intermediate top plate 107 and the corresponding side top plate 106, the fillet weld between the intermediate top plate 107 and the crossbeam partition 105, and the bevel weld between the intermediate top plate 107 and the corresponding inner web plate 103 in sequence, and perform weld quality inspection.

[0094] S264. Repeat steps S261-S263 until all intermediate top plates 107 are assembled and welded.

[0095] In steps S261-S264, the elevation of the intermediate top plate 107 is controlled by the measurement control network to ensure the flatness and alignment accuracy of the top surface of the entire beam segment 100, providing a high-quality reference surface for subsequent bridge deck paving. At the same time, the integrity and load-bearing capacity of the top of the beam segment 100 are guaranteed by welding and quality inspection of key welds such as penetration butt joints, fillet welds, and bevel welds.

[0096] S27. Assemble the cantilever block 108 on the outside of the outer web 104.

[0097] Specifically, refer to Figure 8 This includes the following steps: S271. Pre-mark the assembly position lines on the outer web 104.

[0098] S272. Hoist the cantilever block 108 to the outside of the outer web plate 104, and use the assembly position line on the outer web plate 104 as a reference to install the cantilever block 108 to the corresponding position on the outer web plate 104.

[0099] S273. Repeat steps S271-S272 until all cantilever blocks 108 are assembled onto the corresponding outer web plates 104.

[0100] In steps S271-S273 above, the elevation of the cantilever block 108 is controlled by the measurement control network to ensure that the overall width and alignment of the steel box girder meet the design requirements.

[0101] Reference Figure 8 With the cooperation of the above steps S21-S27, several beam segments 100 are assembled sequentially on the jig, realizing the continuous matching welding and pre-assembly of unit components on the jig. Thus, the assembly from one unit component to all beam segments 100 is completed at one time on the jig. This assembly method effectively avoids the cumulative error caused by the existing segment-by-segment on-site assembly.

[0102] S3. Weld all beam segments 100mm apart in sequence to form a complete steel box girder.

[0103] Specifically, refer to Figure 8 and Figure 9The positions of several beam segments 100 are adjusted according to the measurement control network, and then the several beam segments 100 are sequentially welded together to form a complete steel box girder.

[0104] In this embodiment, using the longitudinal and transverse baselines of each beam segment 100 as references, the relative positions of each beam segment 100 are precisely adjusted using a measurement control network to ensure that the alignment accuracy of each beam segment 100 meets the requirements. After the adjustment is completed, the interfaces (i.e., ring joints) between adjacent beam segments 100 are welded according to the established welding process requirements, so that multiple beam segments 100 are connected into a structurally continuous and uniformly shaped steel box girder.

[0105] S4. Weld several functional accessories onto the steel box girder.

[0106] Specifically, according to the construction drawings, shear studs are welded onto the formed steel box girder, temporary lifting lugs and other auxiliary embedded parts are installed.

[0107] S5. Perform dimensional inspection and linearity verification on the complete steel box girder through a measurement control network.

[0108] Specifically, when deviations in the dimensions or linearity of the steel box girder are found, the steel box girder is corrected.

[0109] S6. Post-processing and transportation of steel box girders.

[0110] Specifically, it includes the following steps: The pre-reserved process allowance on the steel box girder is cut to fit the dimensions.

[0111] The steel box girder is disassembled and removed from the jig by a girder transport vehicle.

[0112] The rigid box girder was transferred to the painting area for anti-corrosion coating.

[0113] The painted steel box girders are stored or shipped to the construction site.

[0114] The implementation principle of this application embodiment is as follows: by constructing an ultra-large size, high rigidity jig with a preset anti-deformation line shape as a global reference, and setting a measurement control network covering the jig, multiple beam segments 100 are continuously and synchronously matched, assembled and welded on the jig.

[0115] The manufacturing process described in this application actively compensates for welding and gravity deformation of the steel beam frame during the manufacturing process by pre-setting the longitudinal and transverse alignments of the jig. Furthermore, it uses a measurement control network to monitor and correct deviations in real time during the manufacturing process of the steel beam frame, thus achieving one-time manufacturing from a single unit to the entire steel box girder. This solves the problem of cumulative errors caused by cumbersome procedures and inconsistent benchmarks in existing processes, thereby improving manufacturing efficiency while greatly ensuring the forming accuracy and welding quality of the steel box girder.

[0116] Example 2: A jig for manufacturing steel box girders, referring to... Figure 10 and Figure 11 The system includes: a base frame 1, which is set on the ground, and several lifting groups are set on the base frame 1, which are arranged sequentially along the length of the base frame 1. Each lifting group includes several adjustable lifting frames 2, which are arranged sequentially along the width of the base frame 1, and the adjustable lifting frames 2 are detachably connected to the base frame 1. All the adjustable lifting frames 2 are arranged in a matrix.

[0117] By adjusting the height of each adjustable lifting frame 2, the support surface formed by the top of all adjustable lifting frames 2 can be adapted to the bottom curved surface of the steel box girder, thereby providing contour support for the steel box girder.

[0118] Reference Figure 10 and Figure 11 The base frame 1 includes several columns 11, which are vertically arranged and their bottoms are fixedly connected to the ground. All columns 11 are arranged in a matrix. A support column 12 is provided between two adjacent columns 11. The support column 12 is horizontally arranged and its two ends are detachably connected to the corresponding column 11.

[0119] In this embodiment, the bottom of the column 11 is connected to the ground by expansion bolts or anchor bolts. The support column 12 is connected to the corresponding column 11 by high-strength bolts.

[0120] Reference Figure 10 and Figure 11 Based on the structural design of the base frame 1, a stable foundation is provided for the adjustable lifting frame 2 and the steel box girder. Since the support columns 12 and the uprights 11 are detachably connected, the support columns 12 in the corresponding areas can be easily disassembled after the steel box girder is manufactured, providing space for the girder transport vehicle to pass through when a transport channel needs to be established. Furthermore, the support columns 12 that need to be disassembled can be freely selected, thus establishing a transport channel on either side of the base frame 1, further improving the flexibility of establishing the transport channel.

[0121] Reference Figure 11 and Figure 12The adjustable lifting frame 2 includes a vertical frame 21, which is vertically arranged. A support base plate 22 is provided at the lower end of the vertical frame 21. The support base plate 22 is located above the base frame 1 and is detachably connected to a number of corresponding support columns 12. The support base plate 22 is horizontally arranged, and the vertical frame 21 is slidably connected to the support base plate 22 along the width direction of the base frame 1. A side-push drive assembly 23 is also provided on the support base plate 22, and the drive end of the side-push drive assembly 23 is connected to the vertical frame 21.

[0122] Reference Figure 11 and Figure 12 The upright frame 21 is provided with a slide frame 24 on both sides along the length of the base frame 1. The slide frame 24 is slidably connected to the upright frame 21 in the vertical direction. A lifting drive assembly 25 is provided between the slide frame 24 and the upright frame 21. The lifting drive assembly 25 is located directly below the corresponding slide frame 24. The lifting drive assembly 25 is set on the upright frame 21, and the drive end of the lifting drive assembly 25 is connected to the corresponding slide frame 24.

[0123] Reference Figure 11 and Figure 12 A support plate frame 26 is provided directly above the upright frame 21, and two skateboard frames 24 are located below the support plate frame 26, with the upper ends of the two skateboard frames 24 slidably connected to the support plate frame 26.

[0124] Reference Figure 11 and Figure 12 The adjustable lifting frame 2, through the coordinated design of the upright frame 21, sliding plate frame 24, lifting drive assembly 25, and support plate frame 26, allows both sliding plate frames 24 to be independently raised and lowered under the action of the two lifting drive assemblies 25. Furthermore, since the support plate frame 26 is rotatably connected to the two sliding plate frames 24, it tilts when the two sliding plate frames 24 are at different heights. By adjusting the height difference between the two sliding plate frames 24, the tilt direction and angle of the support plate frame 26 can be changed. Because the two sliding plate frames 24 are spaced apart along the length of the base frame 1, the tilt direction and angle of the support plate frame 26 can adapt to the longitudinal curve of the steel box girder. This ensures that all support plates 26 on the entire jig cooperate, allowing the jig to adapt to the longitudinal curve of the steel box girder. This improves the flexibility of the jig, enabling it to adapt to the production of different steel box girders.

[0125] In addition, refer to Figure 11 and Figure 12 When the two sliding frames 24 are at the same height, the support frame 26 is set horizontally. At this time, under the coordinated action of several lifting drive components 25, all support frames 26 are raised and lowered synchronously. This allows the adjustable lifting frame 2 to also be used to lift the steel box girder, thereby realizing the lifting and transfer of the support frame 26, ensuring that the steel box girder can be transferred to the beam transport vehicle. Based on this, refer to Figure 11 and Figure 12 The adjustable lifting frame 2, through the coordinated design of the support base plate 22, the upright frame 21, and the side-push drive assembly 23, enables the upright frame 21 to be finely adjusted in the width direction of the base frame 1, thereby allowing the support plate frame 26 to be adjusted in the width direction of the base frame 1. Based on this design, during the assembly of the steel box girder, after several support plate frames 26 support the corresponding beam segments 100, under the synergistic action of several side-push drive assemblies 23, the corresponding support plate frames 26 can drive the corresponding beam segments 100 to move in the width direction of the base frame 1, thereby facilitating the alignment between different beam segments 100.

[0126] In addition, refer to Figure 11 and Figure 12 Since the support plate 26 can be adjusted in the width direction of the base frame 1 and can also be adjusted in the vertical direction, the relative distance between the several support plates 26 arranged sequentially in the width direction of the base frame 1 and the height of each support plate 26 can be coordinated with each other. This allows the several support plates 26 arranged sequentially in the width direction of the base frame 1 to adapt to the transverse curve of the steel box girder, which can further improve the flexibility of the jig and thus improve the adaptability of the jig.

[0127] Reference Figure 12 In this embodiment, the side-push drive assembly 23 includes several hydraulic cylinders, which are axially arranged along the width direction of the base frame 1, and the drive end of the hydraulic cylinder is connected to the upright frame 21.

[0128] The side-push drive assembly 23 employs several hydraulic cylinders to provide a powerful and stable thrust, enabling smooth and shock-free fine-tuning of the erector 21 even under the heavy load of the steel box girder. Simultaneously, the hydraulic system facilitates centralized control, allowing for synchronous or independent lateral adjustments of multiple adjustable lifting frames 2, significantly improving the efficiency and accuracy of the entire jig's lateral adjustment.

[0129] Reference Figure 12 In this embodiment, the lifting drive assembly 25 includes several hydraulic jacks, which are arranged sequentially along the length of the slide frame 24, and the driving end of the hydraulic jacks abuts against the lower side wall of the corresponding slide frame 24.

[0130] The lifting drive assembly 25, in conjunction with several hydraulic jacks, provides a powerful, stable, and easily precisely controllable lifting force. Through a centralized hydraulic system, multiple hydraulic jacks can be synchronously adjusted, thereby achieving precise control of the height of the sliding frame 24. This provides technical assurance for the precise formation of complex longitudinal and transverse pre-camber curves on the entire jig support surface, ensuring the linear accuracy of the steel box girder in one-time forming.

[0131] Reference Figure 12 In this embodiment, two rotating connecting frames 261 are provided below the support plate frame 26. The two rotating connecting frames 261 are spaced apart along the length direction of the base frame 1. The rotating connecting frames 261 are corresponding to the slide frame 24 one by one. The upper end of the slide frame 24 is inserted into the corresponding rotating connecting frame 261, and the slide frame 24 is rotatably connected to the corresponding rotating connecting frame 261.

[0132] By designing the rotating connecting frame 261, when there is a height difference between the two skateboard frames 24, the rotating connecting frame 261 can act as a hinge point, allowing the support plate frame 26 to rotate around it. This allows the support plate frame 26 to tilt freely according to the different heights of the two skateboard frames 24. This design avoids the generation of huge internal stress between the skateboard frame 24 and the support plate frame 26 due to height difference adjustment, which could lead to deformation of the support plate frame 26. This ensures the smoothness of the adjustment process of the support plate frame 26 and the safety of the structure.

[0133] Reference Figure 13 The adjustable lifting frame 2 also includes two rigid support frames 27, which are vertically arranged and whose lower ends are connected to the upright frame 21. The rigid support frames 27 and the sliding plate frames 24 are arranged in a one-to-one correspondence, with the sliding plate frames 24 parallel and spaced apart from their corresponding rigid support frames 27, and located between the side walls of the corresponding rigid support frame 27 and the upright frame 21. A horizontal frame 28 is provided between the rigid support frame 27 and the upright frame 21. The horizontal frame 28 is horizontally arranged and slidably connected to the rigid support frame 27 and the upright frame 21 in the vertical direction. Several support pads 291 are provided below the horizontal frame 28, and these support pads 291 are stacked vertically to form a rigid support column 29. The lower end of the rigid support column 29 abuts against the support base plate 22, and the upper end abuts against the horizontal frame 28.

[0134] Based on the coordinated design of the rigid support frame 27, the flat frame 28, and several support pads 291, on the one hand, after the sliding frame 24 is adjusted into position by the lifting drive assembly 25, the flat frame 28 can be simultaneously adjusted to below the sliding frame 24, and a rigid support column 29 is formed by stacking the support pads 291, transferring the long-term static load of the steel box girder from the hydraulic system to this rigid mechanical structure. This avoids changes in support height caused by leakage or pressure fluctuations that may occur due to the hydraulic system bearing load for a long time, ensuring the long-term stability of the jig throughout the entire manufacturing cycle. On the other hand, in the event of accidental failure or depressurization of the lifting drive assembly 25, the flat frame 28 can instantly bear the load, preventing the sliding frame 24 and the steel box girder above it from falling, thereby greatly ensuring the safety of construction personnel and equipment.

[0135] Reference Figure 13The flat frame 28 is provided with several locking bolts 281, which are screwed onto the flat frame 28. The rigid support frame 27 is provided with a highest position 271 and a lowest position 272, with the highest position 271 positioned above the corresponding lowest position 272. The rigid support frame 27 is provided with several locking screw holes 273, and the locking bolts 281 are respectively located at the corresponding highest position 271 and the corresponding lowest position 272. When the upright frame 21 is located at the highest position 271 or the lowest position 272, the locking bolts 281 are arranged one-to-one with the locking screw holes 273 of the highest position 271 or the lowest position 272, and the locking bolts 281 are inserted into the corresponding locking holes.

[0136] The design of the locking bolt 281 and the locking screw hole 273 provides a reliable mechanical lock for the flat frame 28 at its extreme positions. During frame installation, maintenance, or when not under load, the flat frame 28 can be locked in its highest position 271 or lowest position 272. This facilitates the safe and convenient placement or removal of the support pads 291 by operators and prevents accidental slippage of the flat frame 28. Simultaneously, when the entire adjustable lifting frame 2 needs to be moved or transported, this locking function ensures the stability of its internal moving parts, improving operational safety and convenience. The design of the reinforcing bolt 282 and the reinforcing screw hole further enhances the stability of the locking mechanism of the flat frame 28.

[0137] Reference Figure 12 and Figure 13 A movable base plate 210 is provided at the bottom of the supporting base plate 22. The movable chassis is detachably connected to the supporting base plate 22, and the movable base plate 210 is located directly below the supporting base plate 22. Several casters 2101 are provided on the movable base plate 210.

[0138] Based on the coordinated design of the movable base plate 210 and several casters 2101, when it is necessary to disassemble the corresponding adjustable lifting frame 2 to establish a beam transport channel, it is convenient to quickly move the corresponding adjustable lifting frame 2 out of the jig, thereby facilitating the establishment of the beam transport channel.

[0139] The implementation principle of this application embodiment is as follows: Before the steel box girder is assembled, the lifting drive component 25 and the side push drive component 23 in each lifting adjustable frame 2 are driven. All the lifting adjustable frames 2 work together, so that all the support plate frames 26 are adjusted to the corresponding state, and the several support plate frames 26 arranged sequentially along the length direction of the base frame 1 can adapt to the longitudinal curve of the steel box girder. Similarly, the several support plate frames 26 arranged sequentially along the width direction of the base frame 1 can adapt to the transverse curve of the steel box girder. This makes the jig able to adapt to the shape of the steel box girder, thereby improving the stability of the steel box girder assembly and manufacturing.

[0140] During the manufacturing process of the steel box girder, the side-push drive assembly 23 can be used to adjust the beam segment 100 laterally, thereby aligning several beam segments and improving the final welding accuracy of the steel box girder.

[0141] After the steel box girder is manufactured, the support columns 12 at the predetermined beam transport channel positions on the base frame 1 are removed, and the corresponding adjustable lifting frame 2 is moved out of the beam transport channel by using the movable base plate 210 and casters 2101 at the bottom of the corresponding adjustable lifting frame 2. This allows the beam transport channel to be established quickly.

[0142] Following this, under the coordinated action of several lifting drive components 25, the corresponding lifting adjustable frame 2 synchronously lifts the formed steel box girder to the predetermined height; then, the beam transport vehicle enters the corresponding beam transport channel and moves directly below the steel box girder; then, the steel box girder is smoothly lowered onto the beam transport vehicle by the lifting drive components 25; finally, the beam transport vehicle smoothly transports the steel box girder out.

[0143] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A one-time manufacturing process for steel box girders, characterized in that, Includes the following steps: S1. Design and assembly of the jig, and establish a measurement control network on the jig, and establish a positioning reference network on the jig based on the measurement control network; S2. Using the positioning reference network as a reference, several beam segments (100) are assembled synchronously on the jig, and the spatial position of each beam segment (100) is measured and corrected in real time through the measurement control network. S3. Weld all beam segments (100) in sequence to form a complete steel box girder.

2. The one-time manufacturing process for steel box girders according to claim 1, characterized in that, In step S1, the design and assembly of the jig also includes the following steps: The longitudinal alignment of the formwork is determined based on the bridge alignment values ​​provided in the bridge design and construction drawings and the pre-camber values ​​provided by the design unit. Based on 3D modeling and simulation, the shrinkage deformation of the steel box girder during welding and the deflection deformation caused by its own weight after forming are determined. The transverse shape of the jig is determined by finite element analysis or empirical data calculation. Adjust the jig structure according to the longitudinal and transverse lines of the jig, and complete the jig assembly.

3. The one-time manufacturing process for steel box girders according to claim 1, characterized in that, In step S1, establishing the measurement control network also includes the following steps: Several measurement control benchmarks are established outside the jig, and measurement equipment is installed at the control measurement benchmarks; By using multiple measuring devices to conduct multi-point intersection measurements, a measurement control network covering the entire tire frame area is established.

4. The one-time manufacturing process for steel box girders according to claim 1, characterized in that, Step S2 also includes the following steps: S21. Using the positioning reference network as a reference, position and assemble the base plate units (101) of all the beam segments (100) on the jig. The base plate units (101) are arranged sequentially along the length direction of the jig. The base plate unit (101) includes two base plates (1011). The length direction of the base plates (1011) is arranged along the length direction of the jig, and the two base plates (1011) are arranged parallel and spaced apart along the width direction of the jig. S22. Assemble several internal partitions (102) on the base plate (1011). The internal partitions (102) are arranged sequentially along the length of the base plate (1011). S23. Assemble the inner web plate (103) on one side of the width direction of the bottom plate (1011) and the outer web plate (104) on the other side. Weld the bottom plate (1011), the inner partition plate (102), the outer web plate (104) and the inner web plate (103). S24. Assemble several crossbeam partitions (105) on the inner web (103). The crossbeam partitions (105) are located between two adjacent inner webs (103), and the two corresponding inner webs (103) are positioned and assembled with the crossbeam partitions (105). The several crossbeam partitions (105) are arranged at intervals along the length of the inner web (103). S25. Assemble the side top plate (106) directly above the bottom plate (1011), and position, assemble and weld the corresponding inner web plate (103), outer web plate (104) and box partition (102) to the corresponding side bottom plate (1011); S26. Assemble the intermediate top plate (107) directly above the crossbeam partition (105), and position, assemble and weld the corresponding inner web plate (103), side top plate (106), and crossbeam partition (105) with the intermediate top plate (107). S27. Assemble the cantilever block (108) on the outside of the outer web (104).

5. The one-time manufacturing process for steel box girders according to claim 1, characterized in that, After step S3, the following steps are also included: dimensional inspection and alignment verification of the steel box girder through a measurement control network.

6. A jig for manufacturing steel box girders, used in the one-time manufacturing and forming process of steel box girders as described in any one of claims 1-5, characterized in that, include: A base frame (1) is provided with a plurality of adjustable lifting frames (2), and the plurality of adjustable lifting frames (2) are arranged in a matrix. The adjustable lifting frame (2) includes a vertical frame (21), which is vertically arranged and its lower end is connected to the base frame (1). The vertical frame (21) is provided with a sliding plate frame (24) on both sides along the length direction of the base frame (1). The sliding plate frame (24) is slidably connected to the vertical frame (21) in the vertical direction. A lifting drive assembly (25) is provided below the sliding plate frame (24). The lifting drive assembly (25) is used to drive the corresponding sliding plate frame (24) to move in the vertical direction. Support plates (26) are spaced apart above the upright frame (21), and the sliding plate frame (24) is rotatably connected to the support plates (26).

7. A jig for manufacturing steel box girders according to claim 6, characterized in that, The base frame (1) includes several columns (11), which are vertically arranged and connected to the ground at their lower ends. The columns (11) are arranged in a matrix, and a support column (12) is provided between two adjacent columns (11). The support column (12) is horizontally arranged and its two ends are detachably connected to the corresponding columns (11). The support frame (21) is positioned above several of the support columns (12), and the lower end of the support frame (21) is detachably connected to the corresponding support column (12).

8. A jig for manufacturing steel box girders according to claim 7, characterized in that, A movable base plate (210) is provided below the upright frame (21), and a number of casters (2101) are provided on the movable base plate (210).

9. A jig for manufacturing steel box girders according to claim 6, characterized in that, A support base plate (22) is provided below the upright frame (21). The support base plate (22) is connected to the base frame (1). The upright frame (21) is slidably connected to the support base plate (22) along the width direction of the base frame (1). A side push drive assembly (23) is provided on the support base plate (22). The side push drive assembly (23) is used to drive the upright frame (21) to move along the width direction of the base frame (1).

10. A jig for manufacturing steel box girders according to claim 6, characterized in that, A flat frame (28) is provided below the skateboard frame (24). The flat frame (28) is horizontally arranged and is slidably connected to the upright frame (21) in the vertical direction. The skateboard frame (24) abuts against the corresponding flat frame (28). Several support pads (291) are provided below the flat frame (28). Several support pads (291) are stacked in sequence along the vertical direction to form a rigid support column (29). The upper end of the rigid support column (29) abuts against the flat frame (28), and the lower end abuts against the upright frame (21).

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