High-precision welding device for high-speed bridge and overall construction method

Abstract

The high-precision welding device for the high-speed bridge comprises a steel main beam body, a top steel body is fixedly connected to the top end of the steel main beam body, a plurality of diagonal web member bodies are symmetrically welded to the two sides of the steel main beam body, and movable plates are arranged on the two sides of the steel main beam body; and a welding device used for welding the steel main beam body and the diagonal web member body is slidably mounted on the movable plate in the welding direction. The invention further provides an overall construction method of the high-precision welding device for the high-speed bridge. According to the welding device for welding the steel main beam body and the diagonal web member body, the welding direction and positioning are accurate through the welding device which is installed on the movable plate in the welding direction in a sliding mode and used for welding the steel main beam body and the diagonal web member body, and accurate welding of the steel main beam body and the diagonal web member body is achieved; in addition, the two sides of the steel main beam body and the diagonal web member bodies on the two sides can be synchronously welded through the welding devices on the corresponding sides, and the welding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of high-speed bridge construction, and in particular to a high-precision welding device and an overall construction method for a high-speed bridge. Background Art

[0002] In the process of beam bridge construction, the application of steel-concrete composite beams has many advantages, mainly reflected in higher strength levels, lighter bridge weight, better earthquake resistance and crack resistance, shorter construction period, and less impact on the environment. Especially for the construction of large-span steel-concrete composite beam bridges, it can effectively solve the limitations of various natural factors in bridge construction projects. Therefore, large-span steel-concrete composite beams have important application value in bridge construction.

[0003] However, the main beams of the existing large-span truss steel-concrete composite beam steel structures mainly use I-shaped straight web steel beams. The traditional construction method is to set multiple cross-connections and parallel connection structures between the two opposite straight web main steel beams to increase their stability. This method has low production efficiency, large welding workload, large installation deviations of each rod, and cannot achieve precision control. At the same time, the splicing of adjacent segments adopts direct welding, which is time-consuming and labor-intensive, and has poor integrity and stability.

[0004] There are related invention patents involved in the construction of high-speed bridges, as follows:

[0005] Chinese patent application number: CN107824996A, the name of the invention patent is: A welding method for a bridge steel structure, the invention provides a welding method for a bridge steel structure, including the following steps: Step 1, make a groove, and brush 0.04-0.08mm welding agent on the groove, the welding agent is composed of 3-8 weight parts of ZrO2, 10-14 weight parts of MgO, 12-15 weight parts of TiO2, 20-28 weight parts of Fe3O4, 3-5 weight parts of NaF, 5-8 weight parts of CaF2, 6-9 weight parts of CrCl3 and 10-16 weight parts of Al powder; Step 2, preheat the groove and both ends; Step 3, butt the preheated workpieces to be welded, and weld, the weld height of the first welding is 1 / 2 of the weld height of the workpiece to be welded, and the weld height of the second welding and the third welding is 1 / 4 of the weld height of the workpiece to be welded. The present invention provides a welding method for a bridge steel structure that can significantly improve the mechanical properties of the weld.

[0006] However, in the above-mentioned existing patents, although the mechanical properties of the bridge steel structure can be significantly improved, during the construction of the high-speed bridge, there will still be problems such as large installation deviations of the rods during bridge welding and inability to achieve precision control. Summary of the invention

[0007] In order to solve the above problems, the present invention aims to propose a high-precision welding device and an overall construction method for a high-speed bridge. The welding device for welding the steel main beam body and the diagonal web body is slidably installed on a movable plate along the welding direction. The welding direction and positioning are accurate, thereby realizing precise welding of the steel main beam body and the diagonal web body. In addition, both sides of the steel main beam body and the diagonal web bodies on both sides can be synchronously welded by the welding devices on the corresponding sides, thereby improving the welding efficiency.

[0008] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0009] A high-precision welding device for a high-speed bridge comprises a steel main beam body, the top end of the steel main beam body is fixedly connected to a top steel body, a plurality of diagonal web member bodies are symmetrically welded on both sides of the steel main beam body, movable plates are arranged on both sides of the steel main beam body, and welding devices for welding the steel main beam body and the diagonal web member body are slidably installed on the movable plates along the welding direction.

[0010] Furthermore, a stop plate is provided on one side of the movable plate for positioning one side of the steel main beam body, and a clamping plate is provided on the stop plate for abutting and limiting the web of the steel main beam body.

[0011] Furthermore, a sliding groove is provided on the movable plate along the welding direction, and a sliding block is provided at the bottom of the welding device, and the sliding block and the sliding groove correspond to each other.

[0012] Furthermore, a clamping groove is provided at each set distance of the sliding groove, and when the welding device slides to the set welding position, the sliding block can be clamped with the clamping groove in the horizontal direction by moving up and down.

[0013] Furthermore, the welding device is fixedly connected to a connecting rod on one side away from the steel main beam body, and a pulling handle is fixedly connected to the end of the connecting rod.

[0014] In order to achieve the above object, the present invention also provides an overall construction method of a high-precision welding device for a high-speed bridge, comprising the following steps:

[0015] S1, Construction preparation: Divide the steel segments of the steel-concrete composite beam according to the designed length of the bridge, and formulate a refined manufacturing plan for the steel structure of the steel-concrete composite beam according to the length of the manufacturing segment;

[0016] S2, cutting and processing of parts: using laser cleaning technology to clean the steel plates and process the parts in the construction process;

[0017] S3, production of main beams, cross beams and diagonal web members: welding the main beam body of I-shaped steel on a special I-shaped assembly frame;

[0018] S4, positioning of steel main beam and layout of tire frame: hoist the main steel beam onto the tire frame and position it according to the ground sample line, and use the auxiliary positioning supports on the left and right sides to ensure the stability of the main steel beam;

[0019] S5, installation of web members and node plates: symmetrically assemble the diagonal web member body and node plates on the steel main beam body, control the angle of the diagonal web member body, and weld after passing the inspection;

[0020] S6, crossbeam installation: install the prepared crossbeam between the steel main beam body and the diagonal web member body to form a complete frame structure;

[0021] S7, installation of small longitudinal beam: welding the small longitudinal beam based on the node plate;

[0022] S8, Steel Plate Beam Painting: After the truss-type steel-concrete composite beam steel structure is assembled and processed into one piece, the painting operation is carried out;

[0023] S9, matching and assembly of large sections on site: After the steel plate beam sections are processed and assembled, they are transported to the construction site by a load-carrying semi-trailer flatbed truck, and then hoisted into the bridge in the subsequent sequence.

[0024] Furthermore, the cleaning treatment is performed by irradiating the surface of the steel plate with high-frequency and high-energy laser pulses, and the high-frequency and high-energy laser pulses are used to instantly evaporate or peel off the rust, coating or oil stains on the surface of the steel plate. The parts processing includes using a CNC cutting machine to cut parts with complex shapes, using a multi-nozzle gantry cutting machine to cut longer rectangular parts, using a CNC plasma cutting machine to cut thinner main parts, and using a trolley to accurately cut the grooves on the welding edges of some steel plates. After the cutting is completed, the cutting edge is polished with a grinding wheel, and the inclined belly rod body is processed by a bevel milling machine. The bevel milling machine is used to ensure the groove processing accuracy and part size accuracy.

[0025] Furthermore, in step S3, the stiffening ribs are welded based on the longitudinal and transverse baselines of the steel main beam body, and shear nails are welded using a bolt machine after the steel main beam body is trimmed. The center line of the web plate thickness of the steel main beam body is used as a reference, and the reference is used to weld the I-shaped crossbeam and the web node plate. After the web plate of the steel main beam body is trimmed, the shear nails are welded using a bolt machine, and the diagonal web member body round tube is sawed to a theoretical size, and the diagonal web member body round tube is processed by three-dimensional CNC laser cutting, and the three-dimensional CNC laser cutting is used to manufacture the node plate notch.

[0026] Furthermore, in step S4, taking the center line of the web plate thickness of the steel main beam body as a reference, the reference point is used to mark out a ground sample line as a general assembly line, and the tire frame is arranged on the side of the steel main beam body. In steps S5-S7, the web members and node plates are installed by assembling the small crossbeams and the end crossbeams transversely. The transverse connections at the non-piers of the steel main beam body are small crossbeams, the transverse connections at the middle piers of the steel main beam body are middle crossbeams, and the transverse connections at the branch piers of the steel main beam body are end crossbeams. After the assembly is completed, the straightness and spacing of the nodes are controlled, and welding is performed after the dimensions are qualified. The small longitudinal beams are installed by controlling the straightness of the small longitudinal beams, and trimming is performed after the welding of the small longitudinal beams is completed. After the trimming is completed and the inspection is qualified, the tire frame is decoded.

[0027] Furthermore, in step S8, the steel plate beam coating includes sandblasting for rust removal. Before the sandblasting for rust removal, the humidity and temperature are tested. The sandblasting should be carried out in the order of inside first, outside second, bottom first, top second, difficult first, easy second. The sandblasting should focus on the corners and welds. The compressed air pressure during spraying is 0.3-0.6MPa. The spray gun is about 350mm away from the workpiece surface. The spraying angle needs to be 80-90°. The spraying gun trajectory should be parallel to the workpiece surface. The coverage range of each gun is 1 / 3 to 1 / 2 of the spray width. In the step S9, the large segment matching assembly on the construction site requires an on-site assembly frame, and the steel plate beam segment is placed on the frame. The top plate, web plate and bottom plate between adjacent segments of the steel plate beam are connected in a Z-shaped staggered seam form. The Z-shaped staggered seam form is used to make the steel plate beams fit together, and the top plate, bottom plate and web plate are butt welded. The steel plate beam manufacturing segments are welded into large segments for hoisting, and the second coat of topcoat is applied to the outer surface of the entire bridge.

[0028] Beneficial effects: The present invention uses a welding device for welding the steel main beam body and the diagonal web member body that is slidably installed on a movable plate along the welding direction. The welding direction and positioning are accurate, thereby realizing precise welding of the steel main beam body and the diagonal web member body. In addition, both sides of the steel main beam body and the diagonal web member bodies on both sides can be synchronously welded by the welding devices on the corresponding sides, thereby improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the steel main beam body and the welding device in the high-precision welding device for high-speed bridges according to an embodiment of the present invention;

[0031] Figure 2It is a schematic diagram of the three-dimensional structure of the movable plate, the retaining plate and the fixing plate in the high-precision welding device for the high-speed bridge according to the embodiment of the present invention;

[0032] Figure 3 It is a schematic diagram of the three-dimensional structure of the movable plate, the retaining plate and the fixing plate in the high-precision welding device for the high-speed bridge according to the embodiment of the present invention;

[0033] Figure 4 It is a schematic cross-sectional structure diagram of a movable plate and a blocking plate in a high-precision welding device for a high-speed bridge according to an embodiment of the present invention;

[0034] Figure 5 This is a main flow chart of the overall construction method of the high-precision welding device for high-speed bridges described in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] Example 1

[0037] See also Figure 1-4 A high-precision welding device for a high-speed bridge comprises a steel main beam body 101, the top of the steel main beam body 101 is fixedly connected to a top steel body 102, a plurality of diagonal web member bodies 103 are symmetrically welded on both sides of the steel main beam body 101, and movable plates 201 are arranged on both sides of the steel main beam body 101, and welding devices 206 for welding the steel main beam body 101 and the diagonal web member bodies 103 are slidably installed on the movable plates 201 along the welding direction.

[0038] In this embodiment, a welding device for welding the steel main beam body and the diagonal web member body is slidably installed on a movable plate along the welding direction. The welding direction and positioning are accurate, thereby realizing precise welding of the steel main beam body and the diagonal web member body. In addition, both sides of the steel main beam body and the diagonal web member bodies on both sides of this embodiment can be synchronously welded by the welding device on the corresponding side, thereby improving the welding efficiency.

[0039] In a specific example, a stop plate 202 is provided on one side of the movable plate 201 for positioning one side of the steel main beam body 101 , and a fixing plate 203 is provided on the stop plate 202 for abutting and limiting the web of the steel main beam body 101 .

[0040] In this embodiment, the steel main beam body and the movable plate are limited by the retaining plate and the clamping plate to prevent the welding position from shifting during the welding process, thereby improving the welding accuracy and quality.

[0041] In a specific example, a sliding groove 204 is provided on the movable plate 201 along the welding direction, and a sliding block 207 is provided at the bottom of the welding device 206 , and the sliding block 207 and the sliding groove 204 correspond to each other.

[0042] In this embodiment, the cooperation between the sliding groove and the sliding block enables the welding device to move accurately along the welding direction, thereby improving the welding quality.

[0043] In a specific example, a fixing groove 205 is provided at a set distance between the sliding grooves 204 . When the welding device 206 slides to a set welding position, the sliding block 207 can be horizontally connected with the fixing groove 205 by moving up and down.

[0044] It should be noted that the clamping groove provided inside the sliding groove will have a fixing effect on the sliding block, thereby achieving the fixing of the position of the welding device, and preventing the welding device from shifting during welding without manual contact with the welding device. The fixed position of the welding device can ensure that the relative position of the welding device and the weld remains unchanged during the welding process, thereby improving the welding accuracy. Avoiding the position shift of the welding device can reduce the occurrence of welding defects. Therefore, through the cooperation of the clamping groove and the sliding block, the fixed-point limit of the welding device is achieved, thereby achieving the stability of the welding device during welding, preventing left and right shaking and affecting the welding quality.

[0045] In a specific example, a connecting rod 208 is fixedly connected to a side of the welding device 206 away from the steel main beam body 101 , and a pulling handle 209 is fixedly connected to the end of the connecting rod 208 .

[0046] In this embodiment, the welding device can be conveniently moved to a designated welding point by pulling the handle, thereby improving the convenience of the welding device.

[0047] Example 2

[0048] To achieve the above purpose, see Figure 5 This embodiment also provides an overall construction method of a high-precision welding device for a high-speed bridge, comprising the following steps:

[0049] S1, Construction preparation: Divide the steel segments of the steel-concrete composite beams according to the designed length of the bridge, and formulate a refined manufacturing plan for the steel structure of the steel-concrete composite beams according to the length of the manufacturing segments; Divide the steel segments of the steel-concrete composite beams according to the designed length of the bridge, and use the longitudinal division method for the steel plate beams. The beams are divided into several manufacturing segments and hoisting large segments along the length of the bridge. Formulate a refined manufacturing plan for the steel structure of the steel-concrete composite beams according to the length of the manufacturing segments, determine the steel material storage yard, steel structure workshop, general assembly production line, pre-assembly production line, painting, finished product storage area and corresponding office area, and form a complete set of steel structure processing and transportation capabilities for raw material unloading, storage, unloading, processing, assembly, welding, correction, trial assembly, rust removal, painting, transportation, storage and shipment.

[0050] S2, cutting and processing of parts: using laser cleaning technology to clean the steel plates and process the parts in the construction process;

[0051] S3, production of main beams, cross beams and diagonal web members: welding the main beam body 101 of the I-shaped steel on a special I-shaped assembly frame;

[0052] S4, positioning of steel main beam and layout of tire frame: the steel main beam body 101 is hoisted onto the tire frame and positioned according to the ground sample line, and the auxiliary positioning supports on the left and right sides ensure the stability of the steel main beam body 101;

[0053] S5, installation of web members and node plates: symmetrically assemble the diagonal web member body 103 and the node plate on the steel main beam body 101, control the angle of the diagonal web member body 103, and perform welding after passing the inspection;

[0054] S6, crossbeam installation: the prepared crossbeam is installed between the steel main beam body 101 and the diagonal web member body 103 to form a complete frame structure;

[0055] S7, installation of small longitudinal beam: welding the small longitudinal beam based on the node plate;

[0056] S8, Steel Plate Beam Painting: After the truss-type steel-concrete composite beam steel structure is assembled and processed into one piece, the painting operation is carried out;

[0057] S9, matching and assembly of large sections on site: After the steel plate beam sections are processed and assembled, they are transported to the construction site by a load-carrying semi-trailer flatbed truck, and then hoisted into the bridge in the subsequent sequence.

[0058] To summarize, this embodiment has developed a "fine manufacturing and construction technology for large-span truss steel-concrete composite beam steel structure of highway". The main beam of the large-span truss steel-concrete composite beam steel structure of this technology adopts an I-shaped straight web steel beam, and small cross beams and circular diagonal webs are welded to the steel main beam horizontally. The top plate, web and bottom plate between adjacent segments are connected in a Z-shaped staggered form and fit together, thereby achieving precision control of each rod, improving the level of fine manufacturing and processing of the steel structure of the steel-concrete composite beam, and achieving good technical and economic benefits.

[0059] In a specific example, the cleaning process is performed by irradiating the surface of the steel plate with high-frequency and high-energy laser pulses. The high-frequency and high-energy laser pulses are used to instantly evaporate or peel off the rust, coating or oil stains on the surface of the steel plate. The parts processing includes using a CNC cutting machine to cut parts with complex shapes, using a multi-nozzle gantry cutting machine to cut longer rectangular parts, using a CNC plasma cutting machine to cut thinner main parts, and using a trolley to accurately cut the grooves on the welding edges of some steel plates. After cutting is completed, the cutting edges are polished with a grinding wheel. The inclined belly rod body 103 is processed by a bevel milling machine. The bevel milling machine is used to ensure the groove processing accuracy and part size accuracy.

[0060] In a specific example, in the step S3, the stiffening ribs are welded based on the longitudinal and transverse baselines of the steel main beam body 101, and shear nails are welded using a bolt machine after the steel main beam body 101 is trimmed. The center line of the web plate thickness of the steel main beam body 101 is used as a reference, and the reference is used to weld the I-shaped crossbeam and the web node plate. After the web of the steel main beam body 101 is trimmed, shear nails are welded using a bolt machine, and the round tube of the diagonal web member body 103 is sawed to the theoretical size, and the round tube of the diagonal web member body 103 is processed by three-dimensional CNC laser cutting, and the three-dimensional CNC laser cutting is used to manufacture the node plate notch.

[0061] In a specific example, in step S4, the center line of the web plate thickness of the steel main beam body 101 is used as a reference, and the reference point is used to mark out a ground sample line as the overall assembly line. The tire frame is arranged on the side of the steel main beam body 101. In steps S5-S7, the web members and node plates are installed by assembling the small crossbeams and end crossbeams transversely. The transverse connections at the non-piers of the steel main beam body 101 adopt small crossbeams, the transverse connections at the middle piers of the steel main beam body 101 adopt middle crossbeams, and the transverse connections at the branch piers of the steel main beam body 101 adopt end crossbeams. After the assembly is completed, the straightness and spacing of the nodes are controlled, and welding is performed after the size is qualified. The small longitudinal beams are installed by controlling the straightness of the small longitudinal beams, and trimming is performed after the welding of the small longitudinal beams is completed. After the trimming is completed and the inspection is qualified, the tire frame is decoded.

[0062] In a specific example, in step S8, the steel plate beam coating includes sandblasting and rust removal. The humidity and temperature are tested before the sandblasting and rust removal. Surface treatment is required before sandblasting. All exposed edges must be ground into arcs with a radius of at least R2mm, and all steel plate burrs must be removed; all welding slag and welding beans are removed, rough welds are polished smooth, and welds with undercuts exceeding 2mm should be repaired and polished; all brackets and other things that hinder sandblasting should be removed, and surface defective parts should be trimmed and smoothed; all oil and dirt should be removed. Sandblasting abrasives should be mixed with steel sand and steel shot. The abrasive ratio should be appropriately adjusted according to the surface cleanliness and roughness of the component. The cleanliness and roughness of the sandblasting surface should meet the design requirements. At the same time, the abrasive should be regularly dusted and replenished with new abrasives in time. The sandblasting pressure should be ≥0.5MPa, the sandblasting distance should be 100-300mm, and the sandblasting angle should be 60-80°. When sandblasting, the order of inside first, outside second, bottom first, top second, difficult first, easy second should be followed, and the corners and welds should be treated with emphasis. The dust on the surface after rust removal needs to be cleaned with a vacuum cleaner or high-pressure air, and the cleaned surface cannot be touched with dirty hands or oily gloves. Painting construction should be carried out within 4 hours after sandblasting rust removal, and the longest should not exceed 12 hours. However, no matter how long it stays, as long as rust appears on the surface, it needs to be rusted again. Before each coat of paint is sprayed, the corners, welds, the back of the stiffening ribs and the parts that are difficult to reach with the spray gun should be pre-coated to ensure the coating thickness. The pre-coating is done by brushing or roller coating. The compressed air pressure during spraying is 0.3~0.6MPa, the spray gun is about 350mm away from the workpiece surface, the spraying angle is 80~90°, the gun trajectory should be parallel to the workpiece surface, and the capping range of each gun is 1 / 3~1 / 2 of the spray width.

[0063] Beneficial effects of the present invention:

[0064] The present invention is provided with a steel main beam body, a diagonal web body, a movable plate, a sliding groove, a clamping groove and a welding device, wherein the welding device slides along the sliding groove, and the sliding groove provided inside the sliding groove will fix the sliding block, thereby achieving the fixing of the position of the welding device, and preventing the welding device from shifting during welding without manual contact with the welding device. The fixed position of the welding device can ensure that the relative position of the welding device and the weld remains unchanged during welding, thereby improving the welding accuracy. Thus, avoiding the position shift of the welding device can reduce the generation of welding defects, thereby improving the welding quality. Moreover, the fixed position of the welding device can reduce the movement and adjustment of the welder during the welding process, thereby improving the welding efficiency. Without manual contact with the welding device, the welder can also focus on the welding operation itself, further speeding up the welding speed. The fixing and preventing the shift of the welding device can reduce the risk of safety accidents caused by misoperation or movement of the welding device. The welder does not need to frequently contact the welding device, and also reduces the potential safety risks such as burns and electric shocks.

[0065] The invention mainly adopts an I-shaped straight web steel beam, and a small crossbeam and a circular diagonal web member are used to weld with the steel main beam in the transverse direction. The top plate, web plate and bottom plate between adjacent sections of the steel-concrete composite beam steel structure are connected in the form of a Z-shaped staggered seam, which are interlocked with each other, thereby improving the docking and installation efficiency of adjacent sections. Different types of precision processing instruments and equipment are used to process different complex parts, and the precision rate of cutting is improved, which can reduce the waste of materials, and the cost is economical and the quality is excellent. It can save 10% of the costs of equipment, site, personnel, etc., and has a certain reference and guiding role in the further application and promotion of the processing technology of large-span truss steel-concrete composite beams, and brings good brand benefits to enterprises. By adopting the connection in the form of a Z-shaped staggered seam, the top plate, web plate and bottom plate between adjacent sections can be interlocked with each other. This design greatly simplifies the installation process, reduces the complexity and time consumption during docking, and thus improves the installation efficiency of the overall structure. In addition, using different types of precision processing instruments and equipment to process different complex parts can significantly improve the precision rate of cutting. This not only ensures that the size and quality of the parts meet the design requirements, but also reduces the waste of materials, because more accurate cutting means less waste.

[0066] The present invention firstly processes the manufacturing segments of the large-span truss steel-concrete composite beam steel structure in the factory, and adopts an automated production line to greatly improve the construction efficiency. After being transported to the site, the large segments are assembled to form hoisting segments, which can reduce the amount of on-site assembly. The adjacent segments of the steel-concrete composite beam steel structure are connected in the form of Z-shaped staggered seams, which are interlocked with each other and have a fast assembly speed. It is suitable for the installation and construction of large-span bridge deck truss beams. The laser cleaning technology is used to make the rust spots, coatings or oil stains on the surface of the steel plate evaporate or peel off instantly, so that the pollutants are peeled off, broken and fallen off from the surface of the substrate without damaging the steel plate. The smoke and dust cleaned are recovered by a vacuum cleaner, and the noise generated on the site can be reduced from 120 decibels in the past to below 75 decibels. Compared with traditional manual grinding, it has excellent mute effect and no smoke and dust, green and environmental protection, good cleaning effect, wide application range, high precision, non-contact, controllable substrate damage and greatly reduced labor intensity. The advantages have good social application value. Processing the segments in the factory and adopting an automated production line can greatly improve the manufacturing efficiency and ensure the quality and dimensional accuracy of each segment. After being transported to the site, they are assembled into large sections, which reduces the workload of on-site assembly and thus shortens the overall construction period.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision welding device for high-speed bridges, characterized in that: The invention comprises a steel main beam body (101), the top end of the steel main beam body (101) is fixedly connected to a top steel body (102), a plurality of diagonal web member bodies (103) are symmetrically welded on both sides of the steel main beam body (101), and movable plates (201) are arranged on both sides of the steel main beam body (101), and welding devices (206) for welding the steel main beam body (101) and the diagonal web member bodies (103) are slidably installed on the movable plates (201) along the welding direction.

2. The high-precision welding device for high-speed bridges according to claim 1 is characterized in that: A stop plate (202) is provided on one side of the movable plate (201) for positioning one side of the steel main beam body (101), and a fixing plate (203) is provided on the stop plate (202) for abutting and limiting the web of the steel main beam body (101).

3. The high-precision welding device for high-speed bridges according to claim 1 is characterized in that: A sliding groove (204) is provided on the movable plate (201) along the welding direction, and a sliding block (207) is provided at the bottom of the welding device (206), and the sliding block (207) and the sliding groove (204) are correspondingly matched with each other.

4. The high-precision welding device for high-speed bridges according to claim 3 is characterized in that: The sliding groove (204) is provided with a fixing groove (205) at a set distance. When the welding device (206) slides to a set welding position, the sliding block (207) can be horizontally fixed to the fixing groove (205) by moving up and down.

5. The high-precision welding device for high-speed bridges according to claim 1 is characterized in that: The welding device (206) is fixedly connected to a connecting rod (208) on one side away from the steel main beam body (101), and a pulling handle (209) is fixedly connected to the end of the connecting rod (208).

6. An overall construction method of a high-precision welding device for a high-speed bridge according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, Construction preparation: Divide the steel segments of the steel-concrete composite beam according to the designed length of the bridge, and formulate a refined manufacturing plan for the steel structure of the steel-concrete composite beam according to the length of the manufacturing segment; S2, cutting and processing of parts: using laser cleaning technology to clean the steel plates and process the parts in the construction process; S3, manufacturing of main beam, cross beam and diagonal web member: welding the main beam body (101) of I-shaped steel on a special I-shaped assembly frame; S4, positioning of the steel main beam and arrangement of the tire frame: the steel main beam body (101) is hoisted onto the tire frame and positioned according to the ground sample line, and the left and right auxiliary positioning supports ensure the stability of the steel main beam body (101); S5, installation of web members and node plates: symmetrically assembling the diagonal web member body (103) and the node plates on the steel main beam body (101), controlling the angle of the diagonal web member body (103), and welding after passing the inspection; S6, crossbeam installation: the manufactured crossbeam is installed between the steel main beam body (101) and the diagonal web member body (103) to form a complete frame structure; S7, installation of small longitudinal beam: welding the small longitudinal beam based on the node plate; S8, Steel Plate Beam Painting: After the truss-type steel-concrete composite beam steel structure is assembled and processed into one piece, the painting operation is carried out; S9, matching and assembly of large sections on site: After the steel plate beam sections are processed and assembled, they are transported to the construction site by a load-carrying semi-trailer flatbed truck, and then hoisted into the bridge in the subsequent sequence.

7. The overall construction method of the high-precision welding device for high-speed bridges according to claim 6 is characterized in that: The cleaning process is performed by irradiating the surface of the steel plate with high-frequency and high-energy laser pulses, and the high-frequency and high-energy laser pulses are used to cause the rust, coating or oil stains on the surface of the steel plate to evaporate or peel off instantly. The parts processing includes using a CNC cutting machine to cut parts with complex shapes, using a multi-nozzle gantry cutting machine to cut longer rectangular parts, using a CNC plasma cutting machine to cut thinner main parts, and using a trolley to cut the grooves of the welding edges of some steel plates. After cutting is completed, the cutting edges are polished with a grinding wheel. The inclined belly rod body (103) is processed by a bevel milling machine, and the bevel milling machine is used to ensure the groove processing accuracy and part size accuracy.

8. The overall construction method of the high-precision welding device for high-speed bridges according to claim 6 is characterized in that: In the step S3, the stiffening ribs are welded with the longitudinal and transverse baselines of the steel main beam body (101) as the reference, the shear nails are welded by a bolting machine after the steel main beam body (101) is trimmed, the center line of the web plate thickness of the steel main beam body (101) is used as the reference, and the reference is used to weld the I-shaped cross beam and the web node plate, and the shear nails are welded by a bolting machine after the web plate of the steel main beam body (101) is trimmed, the round tube of the diagonal web member body (103) is sawed to the theoretical size, and the round tube of the diagonal web member body (103) is processed by three-dimensional CNC laser cutting, and the three-dimensional CNC laser cutting is used to manufacture the node plate notch.

9. The overall construction method of the high-precision welding device for high-speed bridges according to claim 6 is characterized in that: In the step S4, the center line of the web plate thickness of the steel main beam body (101) is used as a reference, and the reference point is used to mark the ground sample line as the general assembly line. The tire frame is arranged on the side of the steel main beam body (101). In the steps S5-S7, the web members and node plates are installed by assembling the small crossbeams and end crossbeams transversely. The non-pier parts of the steel main beam body (101) are connected transversely by small crossbeams, the middle pier parts of the steel main beam body (101) are connected transversely by middle crossbeams, and the branch pier parts of the steel main beam body (101) are connected transversely by end crossbeams. After the assembly is completed, the straightness and spacing of the nodes are controlled, and welding is performed after the size is qualified. The small longitudinal beam is installed by controlling the straightness of the small longitudinal beam, and trimming is performed after the small longitudinal beam is welded. After the trimming is completed and the inspection is qualified, the tire frame is decoded.

10. The overall construction method of the high-precision welding device for high-speed bridges according to claim 6, characterized in that: In step S8, the steel plate beam coating includes sandblasting for rust removal. Before the sandblasting for rust removal, the humidity and temperature are tested. The sandblasting should be carried out in the order of inside first, outside second, bottom first, top second, difficult first, easy second. The sandblasting should focus on the corners and welds. The compressed air pressure during spraying is 0.3-0.6MPa. The spray gun is about 350mm away from the workpiece surface. The spraying angle needs to be 80-90°. The spray gun trajectory should be parallel to the workpiece surface. The covering range of each gun is 1 / 3 to 1 / 2 of the spray width. In the step S9, the large segment matching assembly on the construction site requires an on-site assembly frame, and the steel plate beam segment is placed on the frame. The top plate, web plate and bottom plate between adjacent segments of the steel plate beam are connected in a Z-shaped staggered seam form. The Z-shaped staggered seam form is used to make the steel plate beams fit together, and the top plate, bottom plate and web plate are butt welded. The steel plate beam manufacturing segments are welded into large segments for hoisting, and the second coat of topcoat is applied to the outer surface of the entire bridge.

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