A method for repairing a guyed bridge cable suspension boom ear plate

Abstract

The application discloses a kind of repair methods for cable-stayed bridge suspender ear plate, it is related to bridge engineering technical field, including according to the material quality of upper ear plate ZG20Mn cast steel and lower ear plate Q345D structural steel respectively matching corresponding welding material and drying, erect sealed enclosure and windbreak at construction to meet the requirement of operating environment;The range and depth of the wear surface of the pin hole are measured and the wear distribution is recorded, the surface of the wear is polished to expose the fresh metal matrix and the impurities on the substrate surface are completely removed;The welding area of upper ear plate ZG20Mn cast steel and lower ear plate Q345D structural steel is heated to the required preheating temperature, if the welding temperature is lower than the lower limit of preheating temperature during preheating, stop work and reheat;From the deepest wear, extend the deposition welding to both sides, use symmetrical welding for the parts with high restraint degree, and control the single-layer deposition welding thickness.Finally, under the premise of not interrupting traffic, the size accuracy, fatigue resistance and long-term service durability of the repaired suspender ear plate are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a method for repairing the lugs of the hangers in cable-stayed bridge systems. Background Technology

[0002] During the long-term service of cable-stayed bridge systems, the axle pin holes of the hanger lugs must withstand alternating stresses caused by vehicle dynamic loads, wind vibration, and temperature deformation. Especially for short hangers, due to their high stiffness and short length, displacement cannot be eliminated through self-deformation, leading to wear and ellipticization of the lug hole walls. Currently, the industry commonly uses welding repair, which involves filling the worn area with weld and then machining to restore the dimensions. This method relies on mature technology and has advantages in terms of convenient construction and low cost in conventional steel structure maintenance, making it the mainstream solution for dealing with lug wear at present.

[0003] While existing welding repair technologies are widely used, they have significant limitations in the repair of lintel plates for cable-stayed bridges. Traditional processes primarily focus on dimensional restoration, lacking differentiated control over the welding characteristics of lintel plates made of different materials. Since lintel plates are high-restraint components, continuous full welding in a single operation can easily lead to residual welding stress due to excessively high local temperatures, causing shrinkage deformation or cracks in the inner hole. Furthermore, existing technologies often ignore the difference in carbon equivalent between the upper lintel plate (ZG20Mn cast steel) and the lower lintel plate (Q345D structural steel), using uniform welding parameters. This not only makes it difficult to control deformation but also affects the precision of finishing due to the hardened layer after welding, resulting in the repaired lintel plate's fatigue life failing to meet stringent service requirements. Summary of the Invention

[0004] In view of the aforementioned existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a repair method for the lug plate of the cable-stayed bridge hanger, which solves the problems of excessive residual stress, inner hole deformation and fatigue life reduction caused by uncontrolled heat input in the repair of high-restraint lug plates.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a method for repairing the lug plate of a cable-stayed bridge hanger, which includes matching the corresponding welding materials according to the materials of the upper lug plate (ZG20Mn cast steel) and the lower lug plate (Q345D structural steel) and drying them, and setting up a sealed enclosure and windproof shed at the construction site to meet the requirements of the working environment. Measure the range and depth of the wear surface of the pin hole and record the wear distribution. Grind the worn surface until the fresh metal substrate is exposed and thoroughly remove the debris from the substrate surface. The welding areas of the upper ear plate (ZG20Mn cast steel) and the lower ear plate (Q345D structural steel) are heated to the corresponding required preheating temperature. If the temperature of the weldment is lower than the lower limit of the preheating temperature during the preheating process, the operation is stopped and the temperature is reheated. Starting from the deepest wear, the welding extends to both sides. Symmetrical welding is used in areas with high restraint. The thickness of each layer is controlled. After each layer is welded, the welding position is allowed to cool to the corresponding preheating temperature before welding the next layer. When welding Q345D structural steel for the lower ear plate overhead, matching anti-spatter and arc stabilization operation measures are used. When welding multiple layers, the weld bead stacking positions are staggered. After removing each layer of weld slag and grinding until fresh metal is exposed, inspect the appearance of the weld. After confirming that there are no defects and that the areas with high restraint are subjected to hammer stress relief treatment, the interlayer inspection is deemed qualified. Rough grinding removes excess welding material from the inner hole surface and leaves room for fine grinding. Then, waste bushings are used to finish the pin hole so that the hole diameter and roundness meet the design requirements and the hole wall is smooth and free of defects. After repairing the lug plate, allow it to cool slowly to room temperature. For materials that are highly sensitive to cold cracks and for repaired parts with high restraint, perform post-heat treatment. After welding, complete non-destructive testing within the specified time, remove the damaged coating from the repaired area, and apply anti-rust primer and topcoat according to the original design coating plan.

[0007] As a preferred embodiment of the repair method for the lintel lugs of cable-stayed bridges described in this invention, the pre-construction preparation specifically includes: selecting suitable alloy welding rods to address the characteristics of the upper lintel lugs (ZG20Mn cast steel) which has high carbon equivalent and high sensitivity to cold cracking; selecting J506 welding rods to address the good weldability of the lower lintel lugs (Q345D structural steel); and drying the welding materials according to the instructions before use.

[0008] As a preferred embodiment of the repair method for the lintel lugs of cable-stayed bridges described in this invention, the preheating treatment specifically includes: heating the welding area of ​​the upper lintel ZG20Mn cast steel to 150~250℃ using an oxy-acetylene or oxy-propane flame, and heating the welding area of ​​the lower lintel Q345D structural steel to 150~220℃; when the preheating height of the upper lintel ZG20Mn cast steel is high or the heat dissipation area is large, the heated area is covered with insulation material for insulation.

[0009] As a preferred embodiment of the repair method for the lintel lug of a cable-stayed bridge as described in this invention, the layered welding specifically includes: controlling the thickness of each layer to be 2-3 mm; after each layer is welded, the temperature at the welding position is monitored using an infrared thermometer or a contact thermometer, and the next layer can only be welded after the temperature has naturally cooled to the preheating temperature of the corresponding material; the supporting operating measures for overhead welding of the Q345D structural steel of the lower lug include maintaining a short arc welding, keeping the welding torch at a 15°-30° tilt angle to the workpiece surface, and placing a waste bushing at the bottom of the pin hole to receive the welding droplets.

[0010] As a preferred embodiment of the repair method for the lintel lugs of the cable-stayed bridge described in this invention, the interlayer cleaning and inspection specifically includes: after each layer of welding is completed, the welding slag is removed with a fine steel chisel and hammer, and then the weld is ground with an alloy grinding head and a diamond grinding head in sequence until the fresh metal substrate is exposed; after inspecting the appearance of the weld to confirm that there are no slag inclusions or porosity defects, the area with high restraint is subjected to stress relief treatment by hammering.

[0011] As a preferred embodiment of the repair method for the linchpin lug of the cable-stayed bridge as described in this invention, the specific steps of finishing the circular hole include: using an angle grinder to rough grind the welded pin hole to remove the weld scars and heat-deformed layer on the inner hole surface, so that the inner hole is initially restored to a circular shape and a fine grinding allowance of 2-3 mm is reserved; using a scrap, undeformed bushing as a reference tool to finish the pin hole to ensure that the hole diameter and roundness meet the design fit requirements.

[0012] As a preferred embodiment of the repair method for the lintel lugs of cable-stayed bridges described in this invention, the method for eliminating residual stress specifically includes: after welding, rapid cooling by water pouring is prohibited; the lugs must be allowed to cool naturally to room temperature; for ZG20Mn cast steel upper lugs and repair parts with high restraint, the lugs are immediately heated to 250~350℃ after welding and kept at that temperature for 2~3 hours, followed by slow cooling to room temperature; and non-destructive testing is performed on the repaired area 24 hours after welding.

[0013] As a preferred embodiment of the repair method for the lintel lug of the cable-stayed bridge described in this invention, the coating restoration specifically includes: after passing the non-destructive testing inspection, thoroughly removing the damaged coating in the repair area, and sequentially applying anti-rust primer and topcoat according to the original design coating scheme to restore the corrosion resistance of the component.

[0014] In a second aspect, the present invention provides a computer device including a memory and a processor, wherein the memory stores a computer program, wherein when the computer program is executed by the processor, it implements any step of the method for repairing the hanger lugs of a cable-stayed bridge as described in the first aspect of the present invention.

[0015] Thirdly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein, when the computer program is executed by a processor, it implements any step of the method for repairing the lug plate of a cable-stayed bridge hanger as described in the first aspect of the present invention.

[0016] The beneficial effects of this invention are as follows: By matching special welding materials and differentiated preheating parameters to the material differences between the upper ear plate (ZG20Mn cast steel) and the lower ear plate (Q345D structural steel), combined with interlayer temperature control, overhead welding operation, and staggered weld arrangement during the layered welding process, refined control of welding heat input and phase transformation of microstructure is achieved. This effectively avoids the risk of stress concentration and deformation caused by heat accumulation in high-restraint components, ensuring the mechanical properties of the welded joint. At the same time, through the round hole finishing process assisted by the scrap bushing and the differentiated stress relief treatment after welding, while achieving high-precision restoration of repair dimensions, residual hydrogen and internal stress inside the cold crack-sensitive material are significantly eliminated. Ultimately, without interrupting traffic, the dimensional accuracy, fatigue resistance, and long-term service durability of the repaired hanger ear plate are greatly improved. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of a repair method for the lugs of cable-stayed bridge hangers. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0021] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0022] Reference Figure 1 As one embodiment of the present invention, this embodiment provides a method for repairing the lug plate of a cable-stayed bridge hanger, comprising the following steps: The specific preparations before construction include: selecting suitable alloy welding rods for the characteristics of ZG20Mn cast steel for the upper ear plate, which has high carbon equivalent and high sensitivity to cold cracking; selecting J506 welding rods for the characteristics of Q345D structural steel for the lower ear plate, which has good weldability; and drying the welding materials according to the instructions before use.

[0023] Furthermore, by identifying the high carbon equivalent and high cold cracking sensitivity of the ZG20Mn cast steel for the upper ear plate and matching it with a special alloy welding electrode, while matching the more versatile J506 welding electrode for the Q345D structural steel for the lower ear plate, the metallurgical properties of the welding materials and the base material were matched, reducing the risk of cold cracking in the weld area from the root. In addition, by strictly drying the welding materials before welding, the adsorbed moisture in the welding materials was effectively removed, greatly reducing the introduction of hydrogen during the welding process, thereby curbing the generation of hydrogen-induced cracks at the source and improving the tightness and safety of the welded joint.

[0024] The preheating treatment specifically includes: heating the welding area of ​​the upper ear plate ZG20Mn cast steel to 150~250℃ using an oxy-acetylene or oxy-propane flame, and heating the welding area of ​​the lower ear plate Q345D structural steel to 150~220℃; when the preheating height of the upper ear plate ZG20Mn cast steel is high or the heat dissipation area is large, covering the heated area with insulation material for insulation.

[0025] Furthermore, by setting differentiated preheating temperature ranges based on the different material properties of the upper ear plate (ZG20Mn cast steel) and the lower ear plate (Q345D structural steel), and by covering the areas with faster heat dissipation with insulation material, a uniform temperature field distribution in the weld heat-affected zone was ensured, effectively slowing down the welding cooling rate. This reduced residual stress in the weld joint and prevented the formation of hardened structures. This measure significantly improved the crack resistance of highly sensitive materials such as ZG20Mn cast steel during the welding process, avoiding substrate cracking caused by excessive local temperature differences, and laying a good thermodynamic foundation for subsequent surfacing welding.

[0026] The layered welding process specifically includes: controlling the thickness of each layer to be 2-3 mm; after each layer is welded, using an infrared thermometer or a contact thermometer to monitor the temperature at the welding position, and only welding the next layer after the temperature has naturally cooled to the preheating temperature of the corresponding material; the supporting operating measures for overhead welding of the Q345D structural steel lower ear plate include maintaining a short arc welding, keeping the welding torch at a 15°-30° angle to the workpiece surface, and placing a waste bushing at the bottom of the pin hole to collect the weld droplets.

[0027] Furthermore, by strictly controlling the thickness of the single-layer weld overlay and forcibly implementing interlayer temperature control, the heat accumulation and instantaneous high temperature in the inner hole caused by traditional continuous full welding are avoided, effectively suppressing the welding deformation and shrinkage of the high-constraint ear plate; especially for the overhead welding of Q345D structural steel for the lower ear plate, the use of waste bushings to receive weld droplets and specific short arc and tilt angle operations solves the process problem of dripping and spattering during overhead welding, ensuring the deposition quality of all-position welding, and enabling the weld overlay layer to achieve a high-strength, low-defect metallurgical bond with the substrate.

[0028] The interlayer cleaning and inspection specifically includes: after each layer of welding is completed, the welding slag is removed with a fine steel chisel and hammer, and then the weld is ground with an alloy grinding head and a diamond grinding head until the fresh metal substrate is exposed; after inspecting the appearance of the weld to confirm that there are no slag inclusions or porosity defects, the area with high restraint is subjected to stress relief treatment by hammering.

[0029] Furthermore, by thoroughly mechanically grinding and cleaning and visually inspecting each weld layer after welding, and by promptly performing stress-relieving hammering on high-constraint areas, real-time dynamic control of welding quality was achieved, preventing the accumulation and expansion of minor defects during the multi-layer welding process. This step not only ensures the bonding force between each weld layer and the substrate, but also offsets some of the welding tensile stress through the surface compressive stress generated by hammering, further improving the density and fatigue resistance of the repaired area.

[0030] The specific steps of the round hole finishing process include: using an angle grinder to rough grind the welded pin hole to remove the weld scars and heat deformation layer on the inner hole surface, so that the inner hole is initially restored to a round shape and a fine grinding allowance of 2-3mm is reserved; using a scrap, undeformed bushing as a reference tool to finish the pin hole to ensure that the hole diameter and roundness meet the design fit requirements.

[0031] Furthermore, by adopting a combined process of "rough grinding with allowance + finishing with scrap bushings", it not only avoids work hardening or burning caused by excessive single cutting, but also uses scrap bushings as a rigid reference to ensure that the repaired pin hole has extremely high dimensional accuracy and roundness. This process effectively overcomes the processing difficulty caused by uneven hardness of the weld overlay, ensures that the repaired ear plate hole wall is smooth and flat, meets the high-precision fitting requirements of the pin, and restores the smooth force transmission of the structure.

[0032] The specific steps for eliminating residual stress include: after welding, rapid cooling by water pouring is prohibited; the material must be allowed to cool naturally to room temperature. For ZG20Mn cast steel upper ear plates and repair parts with high restraint, the material should be heated to 250-350°C immediately after welding and kept at that temperature for 2-3 hours, followed by slow cooling to room temperature. Non-destructive testing should be performed on the repaired area 24 hours after welding.

[0033] Furthermore, by prohibiting rapid water cooling and strictly implementing slow cooling after welding, as well as specialized post-heat treatment for ZG20Mn cast steel, sufficient diffusion time is provided for the welded area, allowing residual hydrogen to escape fully and reducing structural transformation stress, thus fundamentally eliminating the occurrence of delayed cold cracks. Combined with non-destructive testing at specified post-weld intervals, it is ensured that the material properties in the repaired area are fully stable before delivery for use, greatly guaranteeing the long-term service safety and reliability of the repaired components.

[0034] The coating restoration process specifically includes: after passing the non-destructive testing inspection, thoroughly removing the damaged coating from the repair area, and applying anti-rust primer and topcoat in sequence according to the original design coating scheme to restore the corrosion resistance of the component.

[0035] Furthermore, by restoring the coating system according to the original design standards after passing non-destructive testing, not only was the physical aesthetics of the repaired area restored, but more importantly, the anti-corrosion barrier on the surface of the component was rebuilt. This step effectively blocked the external corrosive media from eroding the heat-affected zone and welding materials of the repaired area, and prevented secondary corrosion caused by coating failure due to welding heat cycle in the repaired part, thereby extending the anti-corrosion life of the ear plate after repair and maintaining the overall durability of the bridge.

[0036] This embodiment also provides a computer device applicable to the repair method for the linchpin lug of a cable-stayed bridge, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the repair method for the linchpin lug of a cable-stayed bridge as proposed in the above embodiment.

[0037] The computer device can be a terminal, comprising a processor, memory, communication interface, display screen, and input devices connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, carrier networks, NFC (Near Field Communication), or other technologies. The display screen can be an LCD screen or an e-ink screen. The input devices can be a touch layer covering the display screen, buttons, a trackball, or a touchpad on the computer device's casing, or an external keyboard, touchpad, or mouse.

[0038] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the repair method for the hanger lugs of cable-stayed bridges as proposed in the above embodiments. The storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0039] In summary, this invention achieves precise control over welding heat input and microstructure phase transformation by matching specialized welding materials and differentiated preheating parameters to the material differences between the upper ear plate (ZG20Mn cast steel) and the lower ear plate (Q345D structural steel). Combined with interpass temperature control during layered welding, specialized overhead welding operations, and staggered weld bead arrangement, this effectively avoids the stress concentration and deformation risks caused by heat accumulation in high-restraint components, ensuring the mechanical properties of the welded joint. Simultaneously, through the round hole finishing process assisted by scrap bushings and differentiated post-weld stress relief treatment, high-precision restoration of repaired dimensions is achieved while significantly eliminating residual hydrogen and internal stress within cold-cracking-sensitive materials. Ultimately, this significantly improves the dimensional accuracy, fatigue resistance, and long-term service durability of the repaired hanger ear plates without disrupting traffic.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for repairing the lug plate of a cable-stayed bridge hanger, characterized in that: This includes matching the corresponding welding materials according to the materials of the upper ear plate (ZG20Mn cast steel) and the lower ear plate (Q345D structural steel) and drying them, and setting up sealed enclosures and windproof sheds at the construction site to meet the requirements of the working environment. Measure the range and depth of the wear surface of the pin hole and record the wear distribution. Grind the worn surface until the fresh metal substrate is exposed and thoroughly remove the debris from the substrate surface. The welding areas of the upper ear plate (ZG20Mn cast steel) and the lower ear plate (Q345D structural steel) are heated to the corresponding required preheating temperature. If the temperature of the weldment is lower than the lower limit of the preheating temperature during the preheating process, the operation is stopped and the temperature is reheated. Starting from the deepest wear, the welding extends to both sides. Symmetrical welding is used in areas with high restraint. The thickness of each layer is controlled. After each layer is welded, the welding position is allowed to cool to the corresponding preheating temperature before welding the next layer. When welding Q345D structural steel for the lower ear plate overhead, matching anti-spatter and arc stabilization operation measures are used. When welding multiple layers, the weld bead stacking positions are staggered. After removing each layer of weld slag and grinding until fresh metal is exposed, inspect the appearance of the weld. After confirming that there are no defects and that the areas with high restraint are subjected to hammer stress relief treatment, the interlayer inspection is deemed qualified. Rough grinding removes excess welding material from the inner hole surface and leaves room for fine grinding. Then, waste bushings are used to finish the pin hole so that the hole diameter and roundness meet the design requirements and the hole wall is smooth and free of defects. After repairing the lug plate, allow it to cool slowly to room temperature. For materials that are highly sensitive to cold cracks and for repaired parts with high restraint, perform post-heat treatment. After welding, complete non-destructive testing within the specified time, remove the damaged coating from the repaired area, and apply anti-rust primer and topcoat according to the original design coating plan.

2. The repair method for the lug plate of the cable-stayed bridge hanger as described in claim 1, characterized in that: The specific preparations before construction include: selecting suitable alloy welding rods for the characteristics of ZG20Mn cast steel for the upper ear plate, which has high carbon equivalent and high sensitivity to cold cracking; selecting J506 welding rods for the characteristics of Q345D structural steel for the lower ear plate, which has good weldability; and drying the welding materials according to the instructions before use.

3. The repair method for the lug plate of the cable-stayed bridge hanger as described in claim 2, characterized in that: The preheating treatment specifically includes: heating the welding area of ​​the upper ear plate ZG20Mn cast steel to 150~250℃ using an oxy-acetylene or oxy-propane flame, and heating the welding area of ​​the lower ear plate Q345D structural steel to 150~220℃; when the preheating height of the upper ear plate ZG20Mn cast steel is high or the heat dissipation area is large, covering the heated area with insulation material for insulation.

4. The repair method for the lug plate of the cable-stayed bridge hanger as described in claim 3, characterized in that: The layered welding process specifically includes: controlling the thickness of each layer to be 2-3 mm; after each layer is welded, using an infrared thermometer or a contact thermometer to monitor the temperature at the welding position, and only welding the next layer after the temperature has naturally cooled to the preheating temperature of the corresponding material; the supporting operating measures for overhead welding of the Q345D structural steel lower ear plate include maintaining a short arc welding, keeping the welding torch at a 15°-30° angle to the workpiece surface, and placing a waste bushing at the bottom of the pin hole to collect the weld droplets.

5. The repair method for the lug plate of the cable-stayed bridge hanger as described in claim 4, characterized in that: The interlayer cleaning and inspection specifically includes: after each layer of welding is completed, the welding slag is removed with a fine steel chisel and hammer, and then the weld is ground with an alloy grinding head and a diamond grinding head until the fresh metal substrate is exposed; after inspecting the appearance of the weld to confirm that there are no slag inclusions or porosity defects, the area with high restraint is subjected to stress relief treatment by hammering.

6. The repair method for the lug plate of the cable-stayed bridge hanger as described in claim 5, characterized in that: The specific steps of the round hole finishing process include: using an angle grinder to rough grind the welded pin hole to remove the weld scars and heat deformation layer on the inner hole surface, so that the inner hole is initially restored to a round shape and a fine grinding allowance of 2-3mm is reserved; using a scrap, undeformed bushing as a reference tool to finish the pin hole to ensure that the hole diameter and roundness meet the design fit requirements.

7. The repair method for the lug plate of the cable-stayed bridge hanger as described in claim 6, characterized in that: The specific steps for eliminating residual stress include: after welding, rapid cooling by water pouring is prohibited; the material must be allowed to cool naturally to room temperature. For ZG20Mn cast steel upper ear plates and repair parts with high restraint, the material should be heated to 250-350°C immediately after welding and kept at that temperature for 2-3 hours, followed by slow cooling to room temperature. Non-destructive testing should be performed on the repaired area 24 hours after welding.

8. The repair method for the lug plate of the cable-stayed bridge hanger as described in claim 7, characterized in that: The coating restoration process specifically includes: after passing the non-destructive testing inspection, thoroughly removing the damaged coating from the repair area, and applying anti-rust primer and topcoat in sequence according to the original design coating scheme to restore the corrosion resistance of the component.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the steps of the repair method for the hanger lugs of cable-stayed bridges as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, it implements the steps of the repair method for the hanger lugs of cable-stayed bridges as described in any one of claims 1 to 8.

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