A method for manufacturing a corrugated steel web of Q420qD material

Abstract

The application discloses a kind of Q420qD material wave-shaped steel web manufacturing method, it is related to wave-shaped steel web processing technical field, comprising the following steps: S1: making block scheme, the wave-shaped steel web to be manufactured is divided according to length direction, and butt joint is arranged at wave peak flat position;S2: according to block scheme, differentiating mould pressing forming processing is carried out to steel plate, to form multiple single wave-shaped sub-web units and multiple wave-shaped web units;S3: using jig to carry out butt welding to single wave-shaped sub-web unit, control the butt joint accuracy and welding deformation of wave-shaped steel web.The application solves the technical problems of difficult wave-shaped steel web processing and difficult control of precision.

Description

Technical Field

[0001] This invention relates to the field of corrugated steel web processing technology, and in particular to a method for manufacturing corrugated steel webs made of Q420qD material. Background Technology

[0002] Corrugated steel webs, as a new type of structural component, have advantages such as light weight and good load-bearing capacity, and are increasingly widely used in the field of engineering structures. In recent years, with the continuous improvement of engineering requirements, the material strength, plate thickness, and corrugation height of corrugated steel webs have been continuously increasing, which has also led to a continuous increase in processing difficulty.

[0003] Currently, the height of a single corrugated steel web plate can reach 9.8m, the thickness of the plate can reach 38mm, and the material can reach high strength levels such as Q420qD. For this type of steel plate, conventional molding equipment is not capable of integral molding of a single segment. In the existing technology, the conventional solution is to divide the corrugated steel web plate into sections in the height direction. The division height depends on the processing parameters of the molding equipment, with a maximum of no more than 5.2 meters. After division, the upper and lower parts are continuously molded separately, and then the upper and lower parts are butt welded together. However, the above-mentioned existing solutions have the following shortcomings: (1) This solution has high requirements for the consistency of the waveform dimensions of the two molding processes. It not only needs to meet the basic tolerance requirements, but also once the waveform is misaligned, it will cause poor butt welding quality, obvious butt welding marks, and will also have an adverse effect on the structural stress performance. (2) For high strength and ultra-thick steel plates such as Q420qD, the control of their springback and creep characteristics is difficult, and the existing molding process cannot guarantee the forming accuracy. Significant differences exist in the springback and required holding time during the molding process for sheets of different thicknesses. The lack of a systematic summary of process parameter patterns leads to unstable molding quality. Summary of the Invention

[0004] The purpose of this invention is to provide a method for manufacturing corrugated steel webs of Q420qD material, which solves the technical problems of difficult processing and precision control of corrugated steel webs in the prior art.

[0005] This application discloses a method for manufacturing a corrugated steel web of Q420qD material, including the following steps: S1: Create a segmentation plan, divide the corrugated steel web to be manufactured according to the length direction, and set the butt joint at the straight position of the crest. S2: According to the segmentation scheme, the steel plate is subjected to differentiated molding process to form multiple single-wave sub-web units and multi-wave web units; S3: The single corrugated sub-web unit is butt-welded using a jig to control the butt-welding accuracy and welding deformation of the corrugated steel web.

[0006] This application does not divide the web in the height direction, but maintains the overall height and forms it in one process. Instead, it divides the height direction into the length direction and sets the butt joint at the straight position of the wave crest to reduce the processing difficulty and ensure the welding quality.

[0007] Based on the above technical solution, the present application can be further improved as follows: Furthermore, when dividing in step S1, if the height of the corrugated steel web is ≤4m, multiple corrugations are divided as a whole, and the division ends at the crest position. If the height of the corrugated steel web is greater than 4m, the corrugated steel is divided into two parts, with the two ends of the division ending at the crest. The advantage of this step is that different processing methods can be selected for different height requirements, thereby ensuring processing efficiency.

[0008] Furthermore, in step S1, the two ends of the division are provided with a wave crest horizontal reference surface, and the flatness deviation between the two wave crest horizontal reference surfaces is ≤0.5mm. The beneficial effect of this step is that it facilitates subsequent splicing processing.

[0009] Furthermore, the specific details of the differentiated molding process in step S2 are as follows: If the height of the corrugated steel web is ≤4m, integral molding is adopted, and the integral web is batch pressed using a fixed-length mold to produce multi-corrugated web units. If the height of the corrugated steel web is greater than 4m, it is processed by single-wave segmented molding to obtain a single-wave sub-web unit. The advantage of this step is that it allows for splicing processing for different heights.

[0010] Furthermore, during the compression molding process in step S2, a pad is provided at the center of the lower mold, and the thickness of the pad and the thickness of the corrugated steel web are matched according to the following formula: ; T represents the thickness of the pad block, in mm; Δ represents the thickness of the corrugated steel web in mm. The advantage of this step is that it provides pads of corresponding thickness, which can reduce springback during forming.

[0011] Furthermore, in step S2, the holding time during compression molding is determined according to the following formula: ; S represents the pressure holding time, measured in seconds (s). Δ represents the thickness of the corrugated steel web in mm. The advantage of this step is that by controlling the holding time, the forming accuracy can be guaranteed.

[0012] Furthermore, in step S3, the spacing between the support points of the jig is no more than 2m. The beneficial effect of this step is to ensure the rigidity of the jig itself and to ensure that the jig does not deform due to its own weight or pressure.

[0013] Furthermore, the specific content of step S3 is as follows: S301: A single corrugated sub-web plate unit is placed on a jig, with the crest horizontally positioned on the longitudinal beam of the jig. The horizontal position of the corrugated steel web plate is measured using a theodolite. The jig plate is provided with multiple positioning support members at equal intervals in the width direction. The positioning support members adopt an arc-shaped structure that matches the waveform of the corrugated steel web plate. S302: Using the longitudinal and vertical baselines as a reference, lay another single-wave sub-web plate unit flat. Control the vertical baseline spacing, mating misalignment, and corner unevenness of the two wave steel web plates. During mating, use a return-line positioning fixture to locate the wave crest position of the single-wave sub-web plate unit as the center line of the waveform, which facilitates subsequent measurement and positioning with a measuring tape. The return-line positioning fixture includes a positioning block and a strong magnet. The positioning block is strip-shaped, and the strong magnet is set with a scale. The strong magnet is also set in the lower center of the positioning block. When using the return-line positioning fixture, place it laterally along the wave steel web plate. Adjust the return-line positioning fixture so that the reference line of the return-line positioning fixture is precisely aligned with the vertical baseline of the steel web plate, and use the strong magnet to hold it in place and lock the center reference. Using the center as the reference, observe the scale lines on both sides of the fixture to locate the wave crest position of the waveform center line, which facilitates subsequent measurement and positioning with a measuring tape. S303: Raise the support at the butt weld position by 3mm from the horizontal base to offset the change in flatness caused by welding shrinkage deformation; S304: After all tests are passed, the sub-web plate unit is secured, the butt joint is welded, and the welding deformation is repaired after welding. The beneficial effect of this step is to ensure the accuracy requirements before welding, and to ensure that the weldment will not shift during the welding operation after securing.

[0014] Furthermore, step S3 also includes the following step: return line accuracy control: When the baseline used for width splicing after forming is located at the low point of the waveform, a return-line positioning fixture is used to locate the center line of the waveform at the peak position.

[0015] Furthermore, step S304 also includes the following step: after welding is completed, the deformation constraint control fixture is placed at the end of the butt joint with the butt joint as the center. Place the pressure block and jack sequentially above the weld, slowly apply force while simultaneously measuring the flatness of the position. After depressurization, measure the flatness again. Depending on the situation, overpressure of 1mm to 3mm can be applied to offset the rebound and correct the welding deformation. The deformation constraint control fixture includes: a lower support beam with arc-shaped protrusions at both ends of the upper part of the lower support beam, which correspond to the waveform of the corrugated web unit; two vertical plates at both ends of the lower support beam, each vertical plate having two through holes spaced apart along its height; an upper crossbeam between the two vertical plates; a pressure block between the two vertical plates; and a jack on the pressure block, with the top of the jack engaging with the bottom side of the upper crossbeam. The beneficial effect of this step is to solve the problem of hard bending caused by the lack of self-constraint at the free end of the weld. By using a special straightening tool to apply pressure when the weld temperature is relatively high, external force is used to intervene in the welding deformation until the temperature drops to room temperature.

[0016] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. This application adopts a special segmented design, and performs differentiated processing for webs of different heights. It uses continuous molding or single-wave molding processes, which can achieve continuous production, improve production efficiency, ensure molding accuracy, and reduce production costs.

[0017] 2. In order to control the docking accuracy after the web is formed, this application sets up a docking jig, a return line positioning fixture and an anti-deformation control fixture, which can effectively meet the high-precision manufacturing requirements of ultra-high corrugated steel web.

[0018] 3. This application, through in-depth research on the creep time and springback compensation law of Q420qD material under different plate thicknesses during the pressing process, establishes a quantitative relationship formula between the holding time, the thickness of the overpressure pad and the plate thickness, which significantly improves the pressing accuracy and pressing quality. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating a method for manufacturing a corrugated steel web of Q420qD material according to a specific embodiment of the present invention. Figure 2This is a schematic diagram of single-wave segmented molding and splicing of the web of a corrugated steel plate made of Q420qD material, as described in a specific embodiment of the present invention. Figure 3 This is a schematic diagram of the sub-web unit on the jig in a method for manufacturing corrugated steel webs of Q420qD material according to a specific embodiment of the present invention. Figure 4 This is a schematic diagram of the rewinding positioning fixture in operation during a specific embodiment of the present invention for a method of manufacturing corrugated steel webs of Q420qD material. Figure 5 for Figure 4 A magnified view of part A; Figure 6 This is a schematic diagram of the anti-deformation control tooling in a method for manufacturing corrugated steel webs of Q420qD material according to a specific embodiment of the present invention; Figure 7 This is a schematic diagram of the deformation control fixture in operation.

[0021] The attached figures are labeled as follows: 1-Positioning block; 2-Strong magnet; 3-Lower support beam; 4-Upright plate; 5-Upper crossbeam; 6-Pressure block; 7-Jack. Detailed Implementation

[0022] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0023] In the description of this application, it should be understood that the terms "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] In this application, unless otherwise expressly specified and limited, the terms "installation," "setup," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0026] Example: With the increasing demand for long-span bridges, the span, material, thickness, and height of corrugated steel web bridges are constantly improving, leading to increased processing difficulties, especially for the corrugated steel web. The large variations in web height make forming and precision control challenging. Current solutions typically involve dividing the steel into sections along the height direction, molding each section separately, and then joining them together. However, this method requires high consistency in the waveform dimensions between the two molding processes; any misalignment directly affects the final product quality. This is particularly true for high-strength steels like Q420qD, whose springback characteristics further exacerbate the difficulty of joining the sections after molding, impacting the processing of the corrugated steel web.

[0027] To solve the above problems, such as Figure 1-7 As shown, this application provides a method for manufacturing corrugated steel webs of Q420qD material. Starting with a segmented design and combining it with subsequent butt welding control, the processing quality of the corrugated steel webs is ensured. The specific steps are as follows: S1: Create a segmentation scheme, divide the corrugated steel web to be manufactured into sections along the length direction, and set the butt joints at the straight positions of the crests; when dividing, if the height of the corrugated steel web is ≤4m, divide multiple corrugations as a whole, and the two ends of the division end at the crest positions. If the height of the corrugated steel web is greater than 4m, the corrugated steel is divided as a whole, with the two ends of the division ending at the crest position. S2: Based on the segmentation scheme, perform differentiated molding to form multiple single-wave sub-web units and multi-wave web units; the specific details of the differentiated molding process in step S2 are as follows: If the height of the corrugated steel web is ≤4m, integral molding is adopted, and the integral web is batch pressed using a fixed-length mold to produce multi-corrugated web units. If the height of the corrugated steel web is greater than 4m, it is processed by single-wave segmented molding and splicing long sections to obtain a single-wave sub-web unit. S3: The sub-web plate unit is butt-welded using a jig to control the butt-welding accuracy and welding deformation of the corrugated steel web plate; the specific details of this step are as follows: S301: Place a single corrugated web unit on the jig, with the crest horizontally positioned on the longitudinal beam of the jig, and measure the horizontal position of the corrugated steel web using a theodolite. S302: Lay another single-wave sub-web plate unit based on the longitudinal and vertical baselines to control the vertical baseline spacing, misalignment, and unevenness of the four corners of the two wave steel web plates; S303: Raise the support at the butt weld position by 3mm from the horizontal base to offset the change in flatness caused by welding shrinkage deformation; S304: After all tests are passed, the sub-web plate units are secured, and the butt joints are welded. After welding, the welding deformation is repaired, with a focus on repairing the flatness of the corrugated steel web plate. The width L tolerance should be 0~+2mm, the wave height h=set ±3mm, and the distance between wave crests λ=set ±2mm (where “set” is the design value of the corrugated steel web plate in the design drawings, for example, wave height h=set ±3mm, “set” refers to the design value of the wave height in the drawings; the distance between wave crests λ=set ±2mm, “set” refers to the design value of the distance between wave crests in the drawings), forming two corrugated steel web plate units.

[0028] A detailed explanation of step S1 follows: Because the maximum height of corrugated steel webs can reach 9.8m, conventional equipment is not capable of integrally molding a single segment of corrugated steel web. The conventional solution is to divide the corrugated steel web into sections along the height, with the division height depending on the processing parameters of the molding equipment, but not exceeding 5.2 meters. After division, the upper and lower parts are continuously molded separately and then joined together. This approach requires extremely high consistency in the waveform dimensions between the two molding processes; it is not simply a matter of meeting tolerance requirements. Once the waveform is misaligned, it will result in poor joint quality, obvious joint marks, poor appearance, and will also affect the force transmission effect. In order to reduce the adverse effects of these factors on welding quality and appearance, and considering the processing capabilities of the relevant molding equipment, this application decides not to divide all webs along the height, but to process them in one go while maintaining the overall height. Instead, the height division is changed to the length division, and the joint is set at the straight position of the wave crest to reduce processing difficulty and ensure welding quality.

[0029] Regarding the division within a 4m limit in step S1 of this application, it is because subsequent transportation is required. Considering transportation feasibility and cost, the division is limited to within 4 meters. This meets the standard oversized requirements for road transportation (usually within 4 meters). Moreover, processing units shorter than 4 meters can be formed by pressing a single pressure device in one operation, resulting in higher processing efficiency and more controllable precision. Therefore, different division methods are selected based on the height during the division process. For webs with lower height, several waveforms can be processed together. For webs with higher height, a single waveform is processed first, and then spliced ​​together later. This significantly improves processing quality and speed.

[0030] In step S1, the two ends of the division are provided with a horizontal reference surface for the wave crest, and the flatness deviation between the two horizontal reference surfaces for the wave crest is ≤0.5mm.

[0031] In step S2 of this application, the molding process employs a heavy-duty press and a dedicated mold to form the corrugated steel web. The dedicated mold includes an upper mold and a lower mold. To ensure the positioning accuracy of the steel plate to be processed, that is, to ensure that the steel plate to be processed and the steel plate moved during the step-by-step molding process can always maintain high-precision positioning with the upper and lower molds, facilitating rapid and high-precision positioning by construction personnel, this application can adopt a high-precision laser positioning control system. Specifically, a positioning line is drawn using a laser at the theoretical crest center of the steel plate to be molded. The upper and lower molds of the molding equipment should be permanently marked with their centerlines, and the positioning accuracy should be ≤0.1mm. Simultaneously, a laser marker is set at a fixed position, and the laser beam should completely coincide with the centerlines of the upper and lower molds. This constitutes a complete high-precision laser positioning control system. Its advantage lies in the rapid and high-precision positioning of the steel plate to be molded, simply by aligning the laser marker with the centerline of the steel plate crest; it also allows for the verification of cumulative deviations that may occur during the processing of the upper and lower molds.

[0032] The steel plate used in this application is made of Q420qD material. To address the springback characteristics of this steel plate, a pad is placed at the center of the lower die. These pads are continuously and evenly distributed longitudinally to fully support the steel plate, creating an overpressure state that counteracts the springback after pressure release. The pad is 300mm long and 30mm wide, and its thickness needs to be adjusted according to the thickness of the steel plate. Specifically, it is designed according to the following formula: ; T represents the thickness of the pad block, in mm; Δ represents the thickness of the steel plate to be processed, in mm. This formula summarizes the springback data of Q420qD material under molding process, and derives the relative relationship between the pad thickness and the steel plate thickness. The range of T is 5mm-8mm.

[0033] Meanwhile, this application requires pressure holding of the steel plate, and the specific pressure holding time is determined according to the following formula: ; S represents the pressure holding time, measured in seconds (s). Δ represents the thickness of the steel plate to be processed, in mm. This formula is derived from data collected on the processing of steel plates with thicknesses ranging from 5 mm to 32 mm, based on the characteristics of Q420qD steel.

[0034] Further explanation of step S3: In this application, the sub-web plate units need to be joined on a jig during assembly. This effectively controls deformation. Specifically, a positioning support member is provided at each peak and trough of the sub-web plate unit. The positioning support member adopts an arc-shaped structure matching the waveform of the sub-web plate unit to achieve precise alignment with the waveform. In the height direction, the spacing between jig support points is controlled within a range of no more than 2m, achieving comprehensive and uniform support.

[0035] The jig in this application can control welding deformation, improve welding accuracy, and enhance the matching degree between the subsequent web rings. The height difference of the top surface of the jig platform is ≤1.0mm, which aims to control deformation during the manufacturing process.

[0036] During the assembly process, it is also necessary to control the accuracy of the re-line and the welding deformation.

[0037] Regarding the accuracy control of the return line, it is controlled during the docking process. The corrugated steel web has a height difference between the peaks and troughs. Affected by the wave height, the baseline used when splicing the width after forming is located at the lower part of the waveform, which is difficult to measure and position accurately and make it difficult to align. Therefore, it is necessary to return the line from the trough to the top surface, that is, the peak surface, to facilitate the use of the measuring tape. Therefore, the return line positioning fixture is designed for the precise control of the waveform spacing during the fabrication process of the corrugated steel web.

[0038] The fixture includes a positioning block 1 and a strong magnet 2. The positioning block 1 is strip-shaped, and the magnet has a scale with a size range of 40mm, which is centered and has an accuracy of 1mm. The strong magnet 2 is located in the lower center of the positioning block 1. The specific operation method is as follows: Place the fixture horizontally along the web of the corrugated steel plate, adjust the fixture so that the reference line of the fixture is precisely aligned with the vertical baseline of the steel web, and use the strong magnet to hold it in place and lock the center reference; using the center as the reference, observe the scale lines on both sides of the fixture to locate the center line of the waveform at the peak position, which is convenient for subsequent measurement and positioning with a measuring tape.

[0039] Regarding welding deformation control, after butt welding, in addition to the overall shrinkage deformation of the weld, the two ends of the weld are free ends and lack sufficient constraint, making them prone to bulging and hard bending towards the bevel side. Therefore, this application adds a deformation constraint control fixture, which includes: The lower support beam 3 has arc-shaped protrusions at both ends of its upper part, which correspond to the waveform of the waveform web unit. Two upright plates 4 are disposed at both ends of the lower support beam 3, and the upright plates 4 have two through holes spaced apart along their height direction; The upper crossbeam 5 is disposed between the two vertical plates 4; Pressure block 6 is disposed between the two upright plates 4; Jack 7 is mounted on the pressure block 6, and the top of jack 7 is engaged with the bottom side of the upper crossbeam 5.

[0040] The main working principle of this tooling is to apply external force at the location where the welding shrinkage cannot offset the preset anti-deformation amount, so as to assist the welding shrinkage stress in achieving the flatness requirement.

[0041] The method of using this deformation constraint control fixture is as follows: After the web plate unit is spliced ​​and welded, the deformation constraint control fixture is placed at the end of the butt joint with the butt joint as the center. The pressure block 6 and the jack 7 are placed directly above the weld in sequence. Pressure is slowly applied by the jack 7, and the flatness at this position is measured at the same time. After the weld temperature drops to room temperature, the pressure is released. The flatness is measured again after the pressure is released. Depending on the situation, the pressure can be over-pressurized by 1mm to 3mm to offset the springback.

[0042] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A method for manufacturing corrugated steel webs of Q420qD material, characterized in that, Includes the following steps: S1: Create a segmentation scheme, divide the corrugated steel web to be manufactured into sections along the length direction, and set the butt joints at the straight positions of the crests; when dividing, if the height of the corrugated steel web is ≤4m, divide multiple corrugations as a whole, and the two ends of the division terminate at the crest positions; in step S1, the two ends of the division are provided with crest horizontal reference planes, and the flatness deviation between the two crest horizontal reference planes is ≤0.5mm; If the height of the corrugated steel web is greater than 4m, the corrugated steel is divided as a whole, with the two ends of the division ending at the crest position. S2: According to the segmentation scheme, the steel plate is subjected to differentiated molding forming to form multiple single-wave sub-web units and multi-wave web units; the specific content of the differentiated molding forming process in step S2 is as follows: If the height of the corrugated steel web is ≤4m, integral molding is adopted, and the integral web is batch pressed using a fixed-length mold to produce multi-corrugated web units. If the height of the corrugated steel web is greater than 4m, it is processed by single-wave block molding to obtain a single-wave sub-web unit. S3: The single corrugated sub-web unit is butt-welded using a jig to control the butt-welding accuracy and welding deformation of the corrugated steel web; the specific content of step S3 is as follows: S301: Place a single-waveform sub-web unit on the jig, with the wave crest positioned horizontally on the jig's longitudinal beam, and measure the horizontal position of the corrugated steel web using a theodolite; the jig is provided with multiple positioning support members at equal intervals in the width direction, and the positioning support members adopt an arc-shaped structure that matches the waveform of the corrugated steel web; S302: Using the longitudinal and vertical baselines as a reference, lay another single-wave sub-web plate unit flat. Control the vertical baseline spacing, misalignment, and unevenness of the four corners of the two wave steel web plates. During the docking, a return-line positioning fixture is used to locate the wave crest position of the single-wave sub-web plate unit as the center line of the waveform, which is convenient for subsequent measurement and positioning with a measuring tape. The return-line positioning fixture includes a positioning block and a strong magnet. The positioning block is strip-shaped, and the strong magnet is set with a scale. The strong magnet is also set in the lower center of the positioning block. When using the return-line positioning fixture, it is placed laterally along the wave steel web plate. The return-line positioning fixture is adjusted so that the reference line of the return-line positioning fixture is precisely aligned with the vertical baseline of the steel web plate, and the strong magnet is used to hold it in place and lock the center reference. Using the center as the reference, observe the scale lines on both sides of the fixture to locate the wave crest position as the center line of the waveform, which is convenient for subsequent measurement and positioning with a measuring tape. S303: Raise the support at the butt weld position by 3mm from the horizontal base to offset the change in flatness caused by welding shrinkage deformation; S304: After all tests are passed, the sub-web plate unit is secured, the butt joint is welded, and the welding deformation is repaired after welding.

2. The method for manufacturing corrugated steel webs according to claim 1, characterized in that, In step S2, during compression molding, a pad is provided at the center of the lower mold. The thickness of the pad and the thickness of the corrugated steel web are matched according to the following formula: ； T represents the thickness of the pad block, in mm; Δ represents the thickness of the corrugated steel web, in mm.

3. The method for manufacturing corrugated steel webs according to claim 2, characterized in that, In step S2, the holding time during compression molding is determined according to the following formula: ； S represents the pressure holding time, measured in seconds (s). Δ represents the thickness of the corrugated steel web, in mm.

4. The method for manufacturing corrugated steel webs according to claim 3, characterized in that, In step S3, the distance between the support points of the tire frame is no greater than 2m.

5. The method for manufacturing corrugated steel webs according to claim 4, characterized in that, Step S304 further includes the following step: after welding is completed, the deformation constraint control fixture is placed at the end of the butt joint with the butt joint as the center. Place the pressure block and jack directly above the weld in sequence, slowly apply force and simultaneously measure the flatness of the position. After depressurization, measure the flatness again. Depending on the situation, the pressure can be overpressed by 1mm to 3mm to offset the rebound and correct the welding deformation. The deformation constraint control fixture includes: The lower support beam has arc-shaped protrusions at both ends of its upper part, which correspond to the waveform of the waveform web unit. Two upright plates are disposed at both ends of the lower support beam, and the upright plates have two through holes spaced apart along their height direction; The upper crossbeam is positioned between the two upright plates; A pressure block is disposed between the two upright plates; A jack is mounted on the pressure block, and the top of the jack engages with the bottom side of the upper crossbeam.

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