Method for manufacturing steel pipe arch segment

Abstract

A method for manufacturing a steel pipe arch segment. The method comprises: cutting and blanking a steel plate on the basis of a preset shape of a single steel pipe segment so as to obtain a steel plate material having the preset shape; performing center punching at preset marking positions on the steel plate material to obtain a prefabricated material having identification points, and rolling the prefabricated material in the direction of width thereof to obtain a steel pipe segment, wherein a plurality of preset marking positions are determined on the basis of the direction of length of the steel plate material and by taking a point at the widest position of the steel plate material as a reference; sequentially placing a plurality of steel pipe segments on a prefabricated jig, and arranging the identification points corresponding to positioning tooth plates in the prefabricated jig; and detecting the shape of each steel pipe segment, adjusting the shape of the corresponding steel pipe segment on the basis of a detection result, and welding same to obtain a steel pipe arch segment. By means of the method, the manufacturing precision and manufacturing efficiency of the steel pipe arch can be improved.

Description

A method for manufacturing steel pipe arch segments Technical Field

[0001] This invention relates to the field of steel pipe arch manufacturing technology, and in particular to a method for manufacturing steel pipe arch segments. Background Technology

[0002] A steel pipe arch is an arch-shaped structure assembled from steel pipes. Since curved steel pipes cannot be manufactured in factories, straight steel pipes are usually used to approximate the curve. However, due to the influence of the arch rib shape and pre-arch, the cutting angle direction and shape of each steel pipe segment are unique. Therefore, the steel pipe assembly needs to be calibrated with high precision before welding.

[0003] Existing technologies typically employ manual assembly and calibration, which is time-consuming and labor-intensive. The large amount of calibration can also lead to human fatigue, thereby affecting the calibration quality and resulting in a reduction in the welding quality and efficiency of steel pipe arches. Summary of the Invention

[0004] The problem addressed by this invention is how to improve the welding quality and efficiency of steel pipe arches.

[0005] To address the above problems, the present invention provides a method for manufacturing steel pipe arch segments, comprising:

[0006] The steel plate is cut and blanked based on the preset shape of a single steel pipe segment to obtain steel plate material with the preset shape;

[0007] The preset marking points on the steel plate material are punched to obtain prefabricated material with marking points. The prefabricated material is rolled around its width direction to obtain a steel pipe segment. The preset marking points are determined based on the length direction of the steel plate material, with the widest point of the steel plate material as a reference. The widest point of the steel plate material is also a preset marking point. The distance between any two adjacent preset marking points is equal.

[0008] Multiple steel pipe segments are placed sequentially on a prefabricated jig, and the marking points are set to correspond with the positioning teeth in the prefabricated jig. The prefabricated jig is provided with multiple positioning teeth, and the shape of the arc formed by the sequential connection of each positioning tooth is the same as the target arch shape of the steel pipe arch segment.

[0009] The shape of each steel pipe segment is inspected, and the shape of the corresponding steel pipe segment is adjusted according to the inspection results;

[0010] The adjusted steel pipe segment is welded to obtain the steel pipe arch segment.

[0011] Optionally, determining the positions of multiple preset markers based on the length direction of the steel plate material, using the widest point of the steel plate material as a reference, includes:

[0012] Obtain the widest point of the steel plate material, and set a preset punctuation mark position on the point on the long side of the steel plate material corresponding to the widest point of the steel plate material;

[0013] The length of the steel plate material is divided into four equal segments to obtain the punctuation spacing. Based on the upper preset punctuation position, the first side preset punctuation position, the lower preset punctuation position, and the second side preset punctuation position are sequentially marked along the length direction of the steel plate material according to the punctuation spacing.

[0014] The step of punching pre-marked points on the steel plate material to obtain prefabricated material with marked points includes:

[0015] Sample punching points are made at the upper preset mark position, the first side preset mark position, the lower preset mark position, and the second side preset mark position on the steel plate material respectively, to obtain the prefabricated material with upper mark point, first side mark point, second side mark point, and lower mark point.

[0016] Optionally, before placing the plurality of steel pipe segments sequentially on the prefabricated jig and setting the marking points corresponding to the positioning teeth in the prefabricated jig, the procedure includes:

[0017] An initial jig is constructed, and target marker points are marked on the initial jig based on the target arch shape of the steel pipe arch segment. The shape of the arc formed by connecting each of the target marker points in sequence is the same as that of the target arch shape.

[0018] Based on the target identification point, the positioning tooth plate is set on the initial jig to obtain the prefabricated jig.

[0019] Optionally, the step of setting the positioning tooth plate on the initial jig based on the target identification point to obtain the prefabricated jig includes:

[0020] Based on the target arch shape and the length of the steel pipe segment, the welding points on the jig are obtained, and the positioning plate is installed according to the welding points;

[0021] The positioning tooth plate is installed on the positioning plate to obtain the prefabricated jig frame.

[0022] Optionally, the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection result includes:

[0023] Based on the center point of the ground sample, a plumb line is constructed, and the intersection point of the steel pipe segment and the plumb line is obtained to obtain the center point of the segment. The center point of the ground sample is the contact point between the steel pipe segment and the bottom plate of the prefabricated frame.

[0024] Determine whether the center point of the segment and the center point of the land sample coincide with the corresponding marker point;

[0025] If the center point of the segment or the center point of the ground sample does not coincide with the corresponding marker point, the shape of the steel pipe segment is adjusted according to the preset construction specifications using an adjustment device.

[0026] If the center point of the segment and the center point of the ground sample both coincide with the corresponding marker point, then the steel pipe segment is welded.

[0027] Optionally, the preset construction specifications include preset specification ellipticity; the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection results further includes:

[0028] The maximum and minimum diameters of the steel pipe segment are obtained, and the ellipticity is detected based on the maximum and minimum diameters.

[0029] The detected ellipticity is compared with the preset standard ellipticity;

[0030] When the detected ellipticity does not meet the preset standard ellipticity, the steel pipe segment is adjusted according to the preset standard ellipticity using the adjustment device.

[0031] Optionally, the adjustment device includes a top frame and a jack; the step of adjusting the steel pipe segment according to the preset ellipticity using the adjustment device when the detected ellipticity does not meet the preset ellipticity specification includes:

[0032] Two adjustment markers are determined based on the minimum diameter. One end of each of the two top frames is made to contact the two adjustment markers, and the other end of each top frame is connected to both ends of the jack.

[0033] The ellipticity of the steel pipe segment is adjusted by adjusting the jack until the detected ellipticity meets the preset specification ellipticity. The adjusted steel pipe segment is then fixed using a cross brace.

[0034] Optionally, the preset construction specifications include the preset misalignment range; the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection results further includes:

[0035] Obtain the assembly misalignment data between each of the steel pipe segments;

[0036] Compare the assembly misalignment data with the preset misalignment range;

[0037] When the assembly misalignment data is not within the preset misalignment range, the steel pipe segment is adjusted according to the preset misalignment range using the adjustment device.

[0038] When the assembly misalignment data is within the preset misalignment range, the steel pipe segment is welded.

[0039] Optionally, the adjustment device includes a top frame and a jack; adjusting the steel pipe segment according to the preset misalignment range using the adjustment device when the assembly misalignment data is not within the preset misalignment range includes:

[0040] One end of the jack is in contact with the steel pipe segment to be adjusted, and the other end is connected to the top frame set on the prefabricated jig.

[0041] The assembly misalignment data is adjusted by adjusting the jacks until it meets the preset misalignment range. The adjusted steel pipe segment is then fixed using a clamping plate.

[0042] Optionally, the step of rolling the prefabricated material around its width direction to obtain a steel pipe segment includes:

[0043] The prefabricated material is pressed at both ends along its length.

[0044] The precast material after the pressure head is rolled around its width direction to obtain the steel pipe segment to be processed;

[0045] The steel pipe segment to be processed is corrected and rounded to obtain the steel pipe segment.

[0046] The beneficial effects of the steel pipe arch segment manufacturing method of the present invention are as follows: Based on the preset shape of a single steel pipe segment, the plate is cut and prepared to obtain a precisely shaped steel plate material, reducing material loss. The steel plate material is punched with pre-marked points according to their positions to obtain prefabricated material with markings. This prefabricated material is then rolled around its width to obtain a steel pipe segment, providing a positioning reference for subsequent jig installation. Specifically, the widest point of the steel plate material is used as the reference, and the preset marking points are determined based on the length direction of the steel plate material. The distance between any two adjacent preset marking points is equal, ensuring that the steel pipe segment rolled from the steel plate material cut according to the preset shape always has markings, allowing for accurate identification of its position during installation. Multiple positioning teeth are set on the prefabricated jig according to the target arch shape. Multiple steel pipe segments are placed on the prefabricated jig, and the markings are aligned with the positioning teeth in the prefabricated jig, achieving rapid and accurate positioning of each steel pipe segment. The shape of each steel pipe segment is inspected, and the shape of the corresponding steel pipe segment is adjusted according to the inspection results. The adjusted steel pipe segments are then welded to obtain steel pipe arch segments, which effectively improves the manufacturing accuracy and efficiency of steel pipe arches. Attached Figure Description

[0047] Figure 1 is a schematic flowchart of the steel pipe arch segment manufacturing method according to an embodiment of the present invention;

[0048] Figure 2 is a schematic diagram of the materials and the structure of the rolled steel pipe segment according to an embodiment of the present invention;

[0049] Figure 3 is a side view of the steel pipe segment installed on the prefabricated frame according to an embodiment of the present invention.

[0050] Figure 4 is a top view of the prefabricated frame according to an embodiment of the present invention;

[0051] Figure 5 is a side view of the steel pipe segment installed on the prefabricated frame according to an embodiment of the present invention.

[0052] Figure 6 is a schematic diagram of the installation structure of the ellipticity adjustment device according to an embodiment of the present invention;

[0053] Figure 7 is a schematic diagram of the installation structure of the misalignment adjustment device according to an embodiment of the present invention. Detailed Implementation

[0054] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0055] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used only to distinguish different devices, modules, or units, and are not intended to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0056] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0057] As shown in Figure 1, an embodiment of the present invention provides a method for manufacturing a steel pipe arch segment, comprising:

[0058] Step S1: Cut the steel plate into blanks based on the preset shape of a single steel pipe segment to obtain steel plate material with the preset shape.

[0059] Specifically, the preset shape of each steel pipe segment should be drawn first, including: calculating the material edge coordinates using a computer, for example, based on the arch axis equation and construction requirements; drawing the material shape using CAD software, for example, based on the material edge coordinates; and directly determining the preset marker positions to obtain the preset shape. Since the steel plate material of the steel pipe segments used for steel pipe arch welding is not rectangular, its width varies along its length, as shown in Figure 2(a). Along its length, from left to right, its width gradually increases and then gradually decreases to ensure that the final rolled steel pipe segments, after splicing, can form the target arch shape. The side view of the steel pipe segment is shown in Figure 2(c), and the front view (i.e., the cross-sectional view) is shown in Figure 2(b).

[0060] Step S2: Punch points at the preset marking positions on the steel plate material to obtain prefabricated material with marking points. Roll the prefabricated material around its width to obtain a steel pipe segment. The preset marking positions are determined based on the length direction of the steel plate material, with the widest point of the steel plate material as a reference. The widest point of the steel plate material is also a preset marking position. The distance between any two adjacent preset marking positions is equal.

[0061] It should be noted that there is at least one preset marking position. For example, first determine the widest point of the preset shape, which corresponds to the highest point of the arch behind the jig when the steel pipe segment is installed in a standard position and shape. Based on this, determine the preset marking position along the length of the steel plate material. For example, if the length of the cut material is 1000mm, and the material is divided into 10 evenly divided segments, then the length of each segment after the even division is 100mm. Based on the widest point of the preset shape, mark the positions at intervals of 100mm along its length as preset marking positions, and make preliminary markings on the plate using, for example, a laser marking machine.

[0062] Specifically, after obtaining the steel plate material cut according to the preset shape (i.e., the material obtained after cutting the steel plate), the cut material is punched with a sample punch based on the preset marked positions to obtain clear marking points for subsequent calibration. Then, the steel plate material is rolled to obtain multiple steel pipe segments to be welded.

[0063] Step S3: Place multiple steel pipe segments sequentially on the prefabricated jig, and set the marking points corresponding to the positioning teeth in the prefabricated jig. The prefabricated jig is provided with multiple positioning teeth, and the shape of the arc formed by the sequential connection of each positioning tooth is the same as the target arch shape of the steel pipe arch segment.

[0064] Specifically, the prefabricated jig is equipped with positioning teeth for precise alignment with the marked points. The arc formed by the sequential connection of multiple positioning teeth is linear with the target arch shape. By matching the marked points and positioning teeth with the multiple steel pipe segments after installation, the manufacturing accuracy of the steel pipe arch is effectively improved. The process involves obtaining the installation posture and arch shape of the target steel pipe arch, confirming the marked points based on this posture, and setting positioning teeth based on the position of any one of the marked points. For example, if marked point A is selected, and a positioning tooth is set on the jig based on the position of marked point A, then during the installation of the steel pipe segments, marked point A is aligned with the positioning tooth for installation. The steel pipe arch welded at this position is the target steel pipe arch. During installation, the markers are matched with the positioning teeth. The number of positioning teeth can correspond one-to-one with the number of markers, or it can be less than the number of markers. When the number of positioning teeth is equal to the number of markers, each positioning tooth is matched with a marker during installation. When the number of positioning teeth is less than the number of markers, the positioning teeth are matched with the corresponding markers, as shown in Figures 2 and 3. The positioning teeth in Figure 3 correspond to point ① in Figure 2. When the steel pipe segment is installed onto the prefabricated jig, the positioning teeth are matched with point ①.

[0065] Step S4: Detect the shape of each steel pipe segment, and adjust the shape of the corresponding steel pipe segment according to the detection results;

[0066] Step S5: Weld the adjusted steel pipe segment to obtain the steel pipe arch segment.

[0067] Specifically, to prevent deformation of the steel pipe segments when they are installed onto the prefabricated jig, the shape of each segment needs to be inspected. If the inspection results do not meet the preparation standards, the segments are adjusted in a timely manner until the results meet the standards, such as a bevel angle error of no more than 5° and a weld gap of 5-8 mm. The segments are then welded, with CO2 gas shielded welding used for the outer root pass. At least 2 / 3 of each weld must be completed before the remaining welds are removed from the jig and welded to obtain a high-precision steel pipe arch that meets the preparation requirements.

[0068] In this embodiment, the plate material is cut and prepared according to the preset shape of a single steel pipe segment to obtain a precisely shaped steel plate material, reducing material loss. The steel plate material is punched with pre-marked points according to their positions to obtain prefabricated material with markings. This prefabricated material is then rolled around its width to obtain a steel pipe segment, providing a positioning reference for subsequent jig installation. Specifically, the widest point of the steel plate material is used as the reference, and the preset marking points are determined based on the length of the steel plate material. The distance between any two adjacent preset marking points is equal, ensuring that the rolled steel pipe segment obtained from the steel plate material cut according to the preset shape always has markings, allowing for accurate identification of its position during installation. Multiple steel pipe segments are placed on the prefabricated jig, and the markings are aligned with the positioning teeth in the jig, achieving rapid and accurate positioning of each steel pipe segment. The shape of each steel pipe segment is inspected, and the shape of the corresponding steel pipe segment is adjusted based on the inspection results. The adjusted steel pipe segments are then welded to obtain a steel pipe arch segment, effectively improving the manufacturing accuracy and efficiency of the steel pipe arch.

[0069] Optionally, determining the positions of multiple preset markers based on the length direction of the steel plate material, using the widest point of the steel plate material as a reference, includes:

[0070] Obtain the widest point of the steel plate material, and set a preset punctuation mark position on the point on the long side of the steel plate material corresponding to the widest point of the steel plate material;

[0071] The length of the steel plate material is divided into four equal segments to obtain the punctuation spacing. Based on the upper preset punctuation position, the first side preset punctuation position, the lower preset punctuation position, and the second side preset punctuation position are sequentially marked along the length direction of the steel plate material according to the punctuation spacing.

[0072] Specifically, in this embodiment, four marker points are set, corresponding to four preset marker positions on the preset shape, as shown in Figure 2. First, the preset marker position is set at the widest point of the preset shape, as shown by point ① in Figure 2. Then, based on the length of the steel plate material of the preset shape, the spacing between the marker positions after dividing it into four equal segments is obtained. For example, if the length of the preset shape of the material in Figure 2 is 100mm, the spacing between the positions after dividing it into four equal segments is 25mm. Using the above preset marker position as the initial position, positions with 25mm intervals are sequentially determined along the length direction of the steel plate material, resulting in the first side preset marker position corresponding to point ②, the lower preset marker position corresponding to point ③, and the second side preset marker position corresponding to point ④ in Figure 2. Dividing the steel plate material evenly according to its length and setting marker points at the boundaries ensures that the marker point positions on each rolled steel pipe segment are the same, avoiding misalignment of marker points due to positional errors that could reduce the manufacturing accuracy of the steel pipe arch.

[0073] It should be noted that when determining the preset punctuation position based on the punctuation spacing, the total length of the preset shape should be considered. Taking Figure 2(a) as an example, the interval between point ① and point ② is 25mm, the interval between point ② and point ③ is 25mm, the interval between point ① and point ④ is 25mm, and the sum of the distance from point ③ to the left end position and the distance from point ④ to the right end position is 25mm.

[0074] Based on the above, the step of punching pre-marked points on the steel plate material to obtain prefabricated material with marked points includes:

[0075] Sample punching points are made at the upper preset mark position, the first side preset mark position, the lower preset mark position, and the second side preset mark position on the steel plate material respectively, to obtain the prefabricated material with upper mark point, first side mark point, second side mark point, and lower mark point.

[0076] Specifically, the upper preset punctuation point corresponds to the upper marker point, which corresponds to point ① in Figure 2; the first side preset punctuation point corresponds to the first side marker point, which corresponds to point ② in Figure 2; the lower preset punctuation point corresponds to the lower marker point, which corresponds to point ③ in Figure 2; and the second side preset punctuation point corresponds to the second side marker point, which corresponds to point ④ in Figure 2.

[0077] Optionally, before placing the plurality of steel pipe segments sequentially on the prefabricated jig and setting the marking points corresponding to the positioning teeth in the prefabricated jig, the procedure includes:

[0078] An initial jig is constructed, and target marker points are marked on the initial jig based on the target arch shape of the steel pipe arch segment. The shape of the arc formed by connecting each of the target marker points in sequence is the same as that of the target arch shape.

[0079] Based on the target identification point, the positioning tooth plate is set on the initial jig to obtain the prefabricated jig.

[0080] Optionally, the step of setting the positioning tooth plate on the initial jig based on the target identification point to obtain the prefabricated jig includes:

[0081] Based on the target arch shape and the length of the steel pipe segment, the welding points on the jig are obtained, and the positioning plate is installed according to the welding points;

[0082] The positioning tooth plate is installed on the positioning plate to obtain the prefabricated jig frame.

[0083] Specifically, the initial jig can only place steel pipe segments, but the steel pipe segments will roll to some extent on it. Therefore, at least one support plate is set at the weld of each steel pipe segment, as shown in Figures 4 and 3. In this embodiment, in order to increase the stability of the steel pipe segments, two support plates are set. The distance between the two support plates is greater than the diameter of the steel pipe segment, and the height of the support plates is usually greater than the radius of the steel pipe segment. Placing the steel pipe segment between the two support plates effectively prevents the steel pipe segment from rolling.

[0084] The positioning plate is equipped with a positioning tooth plate. The method for setting the position of the positioning tooth plate may include: setting any target marker point (usually the marker point at the widest part of the steel plate material) corresponding to the center of the base plate of the jig, obtaining the mapping point of the target marker point closest to the positioning plate on the positioning plate, and setting the positioning tooth plate at the mapping point to obtain the prefabricated jig, as shown in Figure 4. Based on this positioning tooth plate, the installation position of the steel pipe segment can be accurately located.

[0085] It should be noted that the overall unevenness of the jig frame shall not exceed ±2mm, the local unevenness shall not exceed ±0.5mm / m, and the material error shall not exceed ±1mm. The installation error of the support plate shall be controlled within ±0.5mm, and the verticality error between the support plate and the foundation shall be 0.5mm.

[0086] Optionally, the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection result includes:

[0087] Based on the center point of the ground sample, a plumb line is constructed, and the intersection point of the steel pipe segment and the plumb line is obtained to obtain the center point of the segment. The center point of the ground sample is the contact point between the steel pipe segment and the bottom plate of the prefabricated frame.

[0088] Determine whether the center point of the segment and the center point of the land sample coincide with the corresponding marker point;

[0089] If the center point of the segment or the center point of the ground sample does not coincide with the corresponding marker point, the shape of the steel pipe segment is adjusted according to the preset construction specifications using an adjustment device.

[0090] If the center point of the segment and the center point of the ground sample both coincide with the corresponding marker point, then the steel pipe segment is welded.

[0091] Specifically, after the steel pipe segments are installed on the prefabricated frame, their shape is initially inspected. As shown in Figure 5, a plumb line is constructed to the center point of the ground sample to obtain the center point of the segment. If the center point of the segment or the corresponding marker point of the ground sample does not coincide, it indicates that the steel pipe segment has deformed, and the shape of the steel pipe segment needs to be adjusted. If they all coincide, it indicates that the shape of the steel pipe segment conforms to the preset construction specifications, and welding can then be performed.

[0092] Optionally, the preset construction specifications include preset specification ellipticity; the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection results further includes:

[0093] The maximum and minimum diameters of the steel pipe segment are obtained, and the ellipticity is detected based on the maximum and minimum diameters.

[0094] The detected ellipticity is compared with the preset standard ellipticity;

[0095] When the detected ellipticity does not meet the preset standard ellipticity, the steel pipe segment is adjusted according to the preset standard ellipticity using the adjustment device.

[0096] When the detected ellipticity meets the preset specification ellipticity, the steel pipe segments can be welded, or the assembly misalignment data of each steel pipe segment can be obtained to determine whether it conforms to the preset construction specifications.

[0097] Specifically, in this embodiment, after determining that a steel pipe segment has deformed, its ellipticity is used for assessment. The diameter is measured to obtain the maximum and minimum diameters of the deformed steel pipe segment, and the ellipticity is calculated using the following formula:

[0098] Ellipticity = (maximum diameter / maximum diameter - minimum diameter) × 100%;

[0099] According to JTG 3651-2022 Specification for Manufacturing and Installation of Steel Structure Bridges for Highways, the preset specification ellipticity is f≤d / 500mm, and f≤5mm, where d represents the theoretical diameter. Therefore, f is the diameter of the steel pipe segment under ideal conditions.

[0100] Optionally, the adjustment device includes a top frame and a jack; the step of adjusting the steel pipe segment according to the preset ellipticity using the adjustment device when the detected ellipticity does not meet the preset ellipticity specification includes:

[0101] Two adjustment markers are determined based on the minimum diameter. One end of each of the two top frames is made to contact the two adjustment markers, and the other end of each top frame is connected to both ends of the jack.

[0102] The ellipticity of the steel pipe segment is adjusted by adjusting the jack until the detected ellipticity meets the preset specification ellipticity. The adjusted steel pipe segment is then fixed using a cross brace.

[0103] Specifically, first, the minimum diameter is obtained, and then the marker point closest to the minimum diameter is determined as the marker point to be adjusted. For example, if the minimum diameter is diameter d in Figure 5, then the marker points to be adjusted are point ④ and point ②. As shown in Figure 6, two top frames are set up, with one end of each top frame contacting the two marker points to be adjusted. A jack is placed between the two top frames. As the jack operates, the distance between the two top frames is increased, causing the minimum diameter to gradually increase and the maximum diameter to gradually decrease. During this process, the ellipticity of the steel pipe segment is detected in real time until the detected ellipticity meets the preset specification. Then, a cross brace is used to fix the steel pipe segment according to this shape to prevent the steel pipe segment from deforming again due to its own weight or external forces.

[0104] Optionally, the preset construction specifications include the preset misalignment range; the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection results further includes:

[0105] Obtain the assembly misalignment data between each of the steel pipe segments;

[0106] Compare the assembly misalignment data with the preset misalignment range;

[0107] When the assembly misalignment data is not within the preset misalignment range, the steel pipe segment is adjusted according to the preset misalignment range using the adjustment device.

[0108] When the assembly misalignment data is within the preset misalignment range, the steel pipe segment is welded.

[0109] Specifically, after the shape of the steel pipe segments is adjusted, misalignment may occur between them, affecting the welding accuracy of the steel pipe arch. Therefore, it is necessary to assess and adjust the misalignment between the steel pipe segments. The height difference between the outer surfaces of every two steel pipe segments is obtained as the assembly misalignment data. It should be noted that the location for obtaining this data can be determined using marker points, i.e., data is obtained at the same position on each steel pipe segment. Based on the preset misalignment range h < 0.2t, where t is the wall thickness, it is determined whether the welding requirements are met.

[0110] Optionally, the adjustment device includes a top frame and a jack; adjusting the steel pipe segment according to the preset misalignment range using the adjustment device when the assembly misalignment data is not within the preset misalignment range includes:

[0111] One end of the jack is in contact with the steel pipe segment to be adjusted, and the other end is connected to the top frame set on the precast jig.

[0112] The assembly misalignment data is adjusted by adjusting the operation of the jacks until the assembly misalignment data meets the preset misalignment range. The adjusted steel pipe segment is then fixed using a code plate.

[0113] Specifically, a top frame is installed. This top frame can be mounted on the support plate or, as shown in Figure 7, in a structure where one end of the jack is placed on the top frame and the other end is placed on the outer surface of the protruding steel pipe segment end. The jack operates, pushing the protruding steel pipe segment back until the misalignment data between it and the other steel pipe segment end matches the preset misalignment range. A fixing plate is then installed for fixation, facilitating subsequent welding. It should be noted that a cross brace is installed inside the steel pipe segment to ensure that the shape of the steel pipe segment does not deform due to the pushing force of the external jack.

[0114] Optionally, the step of rolling the prefabricated material around its width direction to obtain a steel pipe segment includes:

[0115] The precast material is pressed at both ends along its length; since the remaining straight edges of the material are not easily eliminated when rolling the pipe, the material is pre-bent and pressed before rolling the pipe.

[0116] The prefabricated material after the pressure head is rolled around its width direction using a plate rolling machine to obtain the steel pipe segment to be processed;

[0117] The steel pipe segment to be processed is corrected and rounded to obtain the steel pipe segment.

[0118] Specifically, the steel pipe segments to be processed are corrected to eliminate potential issues such as misalignment of longitudinal seams, misalignment of ends, and over- or under-coiling of longitudinal seams. Based on the welding process, submerged arc welding is used to weld the longitudinal seams of the steel pipe segments. Due to the welding of the longitudinal seams, some out-of-roundness occurs around the welded area of ​​the steel pipe segment. The welded steel pipe is then re-rolled on a plate rolling machine for rounding, resulting in the processed steel pipe segments and improved quality.

[0119] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method of manufacturing a steel tube arch segment, characterized by, The method comprises the following steps: cutting and blanking a steel plate material based on a preset shape of a single steel pipe segment to obtain a steel plate material in the preset shape; punching a preset mark point on the steel plate material to obtain a preformed material with a mark point, and rolling the preformed material around its width direction to obtain a steel pipe segment, wherein, based on the length direction of the steel plate material, a plurality of preset mark points are determined with the widest point of the steel plate material as a reference, and the widest point of the steel plate material is also one of the preset mark points, and the distance between each two adjacent preset mark points is equal; placing a plurality of steel pipe segments on a preformed jig in sequence, and setting the mark points on the positioning tooth plates in the preformed jig, wherein the preformed jig is provided with a plurality of positioning tooth plates, and the line type of the arc formed by sequentially connecting each positioning tooth plate is the same as the target arch type of the steel pipe arch segment; detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection result; welding the adjusted steel pipe segment to obtain the steel pipe arch segment.

2. The steel pipe arch segment manufacturing method of claim 1, wherein, The method comprises the following steps: obtaining the widest point of the steel plate material, and setting a preset mark point on the point on the long side of the steel plate material corresponding to the widest point of the steel plate material; dividing the length of the steel plate material into four equal parts to obtain a mark point spacing, and sequentially marking first side preset mark points, lower preset mark points and second side preset mark points on the long side of the steel plate material along the length direction of the steel plate material based on the preset mark point as a reference; The method comprises the following steps: respectively punching mark points on the upper preset mark point, the first side preset mark point, the lower preset mark point and the second side preset mark point on the steel plate material to obtain the preformed material with upper mark points, first side mark points, second side mark points and lower mark points.

3. The steel pipe arch segment manufacturing method of claim 1, wherein Before the step of placing a plurality of steel pipe segments on a preformed jig in sequence and setting the mark points on the positioning tooth plates in the preformed jig, the method comprises the following steps: constructing an initial jig and marking target mark points on the initial jig based on the target arch type of the steel pipe arch segment, and the line type of the arc formed by sequentially connecting each target mark point is the same as the target arch type; setting the positioning tooth plates on the initial jig based on the target mark points to obtain the preformed jig.

4. The steel pipe arch segment manufacturing method according to claim 3, characterized by, The method comprises the following steps: based on the target arch type and the length of the steel pipe segment, obtaining a welding point on the jig, and installing a positioning plate according to the welding point; setting the positioning tooth plates on the positioning plate to obtain the preformed jig.

5. The steel pipe arch segment manufacturing method of claim 1, wherein, The method comprises the following steps: Constructing a plumb line based on a ground sample center point, obtaining a segment upper center point by intersecting the steel pipe segment and the plumb line, wherein the ground sample center point is a contact point between the steel pipe segment and a bottom plate of the prefabricated jig frame; Judging whether the segment upper center point and the ground sample center point coincide with the corresponding mark points respectively; If the segment upper center point or the ground sample center point does not coincide with the corresponding mark point, adjusting the shape of the steel pipe segment according to a preset construction specification by using an adjusting device; If the segment upper center point and the ground sample center point coincide with the corresponding mark points respectively, welding the steel pipe segment.

6. The steel pipe arch segment manufacturing method of claim 5, wherein, The preset construction specification includes a preset specification ellipticity; the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection result further includes: Obtaining the maximum diameter and the minimum diameter of the steel pipe segment, and obtaining a detection ellipticity according to the maximum diameter and the minimum diameter; Comparing the detection ellipticity with the preset specification ellipticity; When the detection ellipticity does not meet the preset specification ellipticity, adjusting the steel pipe segment according to the preset specification ellipticity by using the adjusting device.

7. The steel pipe arch segment manufacturing method according to claim 6, characterized by, The adjusting device includes a top frame and a jack; when the detection ellipticity does not meet the preset specification ellipticity, adjusting the steel pipe segment according to the preset specification ellipticity by using the adjusting device includes: Determining two to-be-adjusted mark points according to the minimum diameter, setting one end of two top frames to be in contact with the two to-be-adjusted mark points respectively, and connecting the other end of the two top frames with two ends of the jack respectively; Adjusting the ellipticity of the steel pipe segment by adjusting the jack until the detection ellipticity meets the preset specification ellipticity, and fixing the adjusted steel pipe segment by using a cross brace.

8. The steel pipe arch segment manufacturing method of claim 6, wherein, The preset construction specification includes a preset misalignment range; the step of detecting the shape of each steel pipe segment and adjusting the shape of the corresponding steel pipe segment according to the detection result further includes: Obtaining misalignment data between each steel pipe segment; Comparing the misalignment data with the preset misalignment range; When the misalignment data is not within the preset misalignment range, adjusting the steel pipe segment according to the preset misalignment range by using the adjusting device; When the misalignment data is within the preset misalignment range, welding the steel pipe segment.

9. The steel pipe arch segment manufacturing method of claim 8, wherein, The adjusting device includes a top frame and a jack; when the misalignment data is not within the preset misalignment range, adjusting the steel pipe segment according to the preset misalignment range by using the adjusting device includes: Setting one end of the jack to be in contact with the steel pipe segment to be adjusted, and connecting the other end of the jack with the top frame arranged on the prefabricated jig frame; Adjusting the misalignment data by adjusting the jack until the misalignment data meets the preset misalignment range, and fixing the adjusted steel pipe segment by using a code plate.

10. The steel pipe arch segment manufacturing method of claim 1, wherein, The step of rolling the prefabricated material around its width direction to obtain a steel pipe segment includes: Pressing the two ends of the prefabricated material in the length direction; The prefabricated material after the pressure head is rolled around the width direction to obtain a steel pipe segment to be processed; The steel pipe segment to be processed is corrected and rounded to obtain the steel pipe segment.

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