A center registration steel structure pre-assembly method and a joint self-holding device

Abstract

The present application belongs to the technical field of steel structure assembly, and particularly relates to a center registration steel structure pre-assembly method and a joint self-holding adjusting device. The method uses the measured data of steel structure segments to construct a digital model, and uses the end surface center axis of the steel structure segment as a matching reference for virtual pre-assembly. The method replaces the physical pre-assembly mode with field measurement and virtual pre-assembly simulation, and uses data conversion and calculation to obtain the installation parameters of the joint connecting piece in a reasonable linear state, which are used as the lofting parameters for guiding device adjustment and joint installation. In addition, a simple and portable joint self-holding adjusting device is used to provide a reliable and stable construction platform to assist the installation of the connecting piece, and to realize the rapid matching and connection of the steel structure joint. The present application uses the virtual pre-assembly method to match the spatial attitude, and then uses the auxiliary device that can be assembled to realize the accurate positioning and installation of the adjacent connecting end, thereby saving the time and space cost and ensuring the installation quality.

Description

Technical Field

[0001] This invention belongs to the field of oil well workover technology, and specifically relates to a method for pre-assembling a steel structure with center registration and a self-holding adjustment device for the joint. Background Technology

[0002] Due to limitations in transportation and installation conditions, the manufacturing of large steel structures often requires on-site assembly, which must meet high precision requirements. For example, steel pipe segment connections often employ internal flange bolting and external welding. Because flange installation is independent of steel pipe assembly, the relative postures of the flanges and steel pipes, as well as the relative postures of adjacent flanges, must be matched pairwise to ensure successful segment connection.

[0003] The existing installation method involves placing the pipe openings of adjacent segments at the designed spacing, welding the flange of the previous segment according to the designed layout position, spot welding the flange of the next segment to be installed close to the already installed flange, welding the flange ribs in a temporary fixed state, and then cutting off the spot welded connection to complete one flange matching installation. The existing installation method has the following problems in actual operation: (1) hoisting and adjusting the segments is time-consuming and labor-intensive; (2) the reference segment will occupy additional assembly space and slow down the construction progress; (3) spot welding and cutting may cause welding deformation, affecting the tight fit of the flanges between segments. Summary of the Invention

[0004] To address the aforementioned problems, the purpose of this invention is to provide a center-registered steel structure pre-assembly method and a joint self-holding adjustment device. This method utilizes measured data of steel structure segments to construct a digital model, and uses the centerline of the end face of the steel structure segment as a matching reference for virtual pre-assembly, thereby obtaining accurate connection end layout parameters. Furthermore, a simple and lightweight joint self-holding adjustment device provides a reliable and stable construction platform, assisting in the installation of connectors, achieving rapid matching and connection of steel structure joints, improving production efficiency, and reducing costs.

[0005] The technical solution of this invention is: a method for pre-assembling a steel structure with center registration, comprising the following steps:

[0006] S1: Data is collected from each of the multiple steel structure segments to be assembled. The data collection method is to perform limited measurement on key measuring points of the steel structure segments or to perform three-dimensional scanning measurement on the entire steel structure segment.

[0007] S2: Process the collected data of multiple steel structure segments to be assembled. Specifically, reconstruct the virtual space of each steel structure segment, establish the data model of the steel structure segment, and perform translation and rotation operations on the data models of adjacent steel structure segments so that the line connecting the center points of the end faces of the steel structure segments matches and connects according to the design position, realize the pre-assembly simulation in the virtual space, and obtain the layout parameters of the flanges to be installed between the steel structure segments to be assembled.

[0008] S3: Install the joint self-holding adjustment device at the connection end to be installed on the steel structure segment, and adjust the joint self-holding adjustment device according to the layout parameters of the flange to be installed obtained in step S2. Adjust and fix the flange to be installed in the layout position. After verification, complete the matching and installation of the flange to be installed.

[0009] S4: Remove the self-holding adjustment device of the joint, move the installed steel structure segment, and wait for hoisting.

[0010] In step S1, data is collected from the multiple steel structure segments to be assembled. During the data collection and measurement, the steel structure segments to be assembled must be in the same placement state, that is, simultaneously maintaining a vertical placement state or a side-lying placement state.

[0011] In step S1, data is collected from each of the multiple steel structure segments to be assembled using traditional measurement techniques. Specifically, before collecting data from each segment, the layout measurement points for the steel structure segments and the flanges to be installed are marked. There are more than three layout measurement points for each critical section of the flanges and steel structure segments. After marking the key measurement points of the critical sections on the steel structure segments to be measured, coordinate point measurements are performed. The relative positions between key sections within the overall steel structure segment are determined based on the measured coordinates of the key points. The key sections are selected from the beginning and end sections of the steel structure segment to be measured, as well as other design control sections. Relevant measurement points include, but are not limited to, the layout measurement points. During the measurement process, the same segment... Each measuring point must be in the same coordinate system. In step S2, the model formed by the connection of the key measuring points measured in step S1 is used as the processing object. First, the model formed by the connection of the key measuring points is initially placed in place according to the design orientation and state. The connection of the center points of the key sections of each steel structure segment is extracted as the actual line shape of the steel structure segment. The included angle parameter of the design line shape is input. The data model is deflected according to the design included angle based on the actual line shape to complete the virtual pre-assembly matching. Then, a local coordinate system is established at the connection end to be installed with the pipe openings of each steel structure segment as the reference. The layout point data of the pipe openings of each steel structure segment is converted to the local coordinate system to give the relative position or distance parameters of the layout points of the pipe openings of each steel structure segment.

[0012] For steel structures with circular cross-sections, four layout measuring points are set for each cross-section, located at the four sub-points of the circumference of each pipe opening and flange to be installed on each steel structure segment.

[0013] In step S1, data is collected from multiple steel structure segments to be assembled using three-dimensional laser scanning technology. The entire steel structure segment is scanned using three-dimensional laser scanning to obtain a point cloud data model showing the overall planar distribution of the steel structure segment. The point cloud data from each station in the three-dimensional scan must ensure that the target spheres in overlapping areas can be identified and coincident. In step S2, using the point cloud data model obtained from the three-dimensional laser scan in step S1 as the processing object, the measured point cloud data model is first registered with the design point cloud model. The spatial geometric relationship of the design model is used to determine the matching posture of the point cloud models of adjacent steel structure segments. The center points of key sections of the steel structure segments are extracted for registration and adjustment, completing the pre-assembly of the data model. Subsequently, the outlines and key points of the installed flanges and their bolt holes are extracted to determine the key control points for flange layout. Finally, a local coordinate system is established based on the pipe openings of the steel structure segments to be installed. The point cloud data of the pipe opening range of the steel structure segments is converted to the local coordinate system to obtain the relative position or distance parameters of the layout points of each pipe opening of the steel structure segments.

[0014] A self-holding device for pre-assembled steel structure joints includes a cross frame. Self-holding clamps are provided at the ends of the cross rods of the cross frame. Adjustment bolts are provided in the middle sections of the cross rods. A positioning slider is provided on the cross rod of the cross frame between the adjustment bolts and the self-holding clamps. A longitudinal positioning bolt is provided on the positioning slider perpendicular to the cross rod direction of the cross frame. A locking bolt is provided on the positioning slider parallel to the cross rod direction of the cross frame. One end of the locking bolt is movably connected to the positioning slider, and the other end is fixedly connected to the self-holding clamp.

[0015] The cross frame comprises two steel pipes of the same length, which are arranged perpendicularly, and a frame center bolt is provided at the center connection of the two steel pipes.

[0016] The steel pipe includes a first section, a second section, a third section, and so on up to a seventh section, totaling seven sections. The seven sections are connected by welding. The thickness of the odd-numbered sections is greater than that of the even-numbered sections, and the surface of the odd-numbered sections is threaded.

[0017] The positioning slider is L-shaped, and the cross rod of the cross frame passes vertically through one side of the long side of the L-shaped positioning slider. A nut is provided at the contact point between the cross rod of the cross frame and the long side of the L-shaped positioning slider. A groove is provided on the positioning slider near the short side of the nut. A longitudinal positioning bolt is provided on one side of the short side of the L-shaped positioning slider.

[0018] The self-holding clamp is concave and includes two composite plates of the same shape and size and multiple fixing bolts. The composite plate has a double-layer structure, including a steel layer and a rubber layer. The steel layer is a rectangular straight steel plate, and the rubber layer has a double-layer stepped structure. The multiple fixing bolts pass through the thicker side of the double-layer stepped structure of the rubber layer of the composite plate to fix the two composite plates together.

[0019] The technical advantages of this invention are as follows: 1. This invention utilizes measured data of steel structure segments to construct a digital model, and uses the centerline of the end face of the steel structure segment as a matching benchmark for virtual pre-assembly, thereby obtaining accurate connection end layout parameters. Combined with a simple and lightweight self-holding adjustment device, it provides a reliable and stable construction platform, assisting in the installation of connectors, achieving rapid matching and connection of steel structure joints, improving production efficiency, and reducing costs. 2. The self-holding adjustment device of this invention adjusts the flange installation posture through positioning sliders and adjusting bolts, and provides a stable working platform through the design of the self-holding clamp. 3. This invention uses groove constraints and bolt supports to temporarily fix the flange to be installed, avoiding deformation caused by welding and cutting, making the segment connection tighter and more reliable. 4. The self-holding clamp of the self-holding adjustment device of this invention adopts a double-layer composite plate structure, with an internal rubber layer using a double-layer stepped structure. The rubber layer is replaceable and can adapt to different pipe wall thicknesses and curved pipe openings.

[0020] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of data acquisition and overall coordinate system for a steel structure segment placed on its side in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the measuring point arrangement and local coordinate system of a steel structure segment placed in a horizontal position according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the calibration of measuring points under the matching state of the flange to be installed, according to an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the measuring point arrangement for a vertically placed steel structure segment according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of virtual pre-assembly for finite measurement points according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of virtual pre-assembly using three-dimensional laser scanning technology according to an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the data xy coordinate system transformation according to an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of data rotation in the xy plane according to an embodiment of the present invention.

[0029] Figure 9 This is a three-dimensional structural schematic diagram of the self-holding adjustment device for pre-assembled steel structure joints according to an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the self-holding adjustment device for the pre-assembled steel structure joint adjusting the flange to be installed, according to an embodiment of the present invention.

[0031] Reference numerals: 1-Installed connection end; 2-Connection end to be installed; 3-Self-holding clamp; 4-Cross frame; 5-Positioning slider; 6-Adjusting bolt; 7-Clipping bolt; 8-Frame center bolt; 9-Nut; 10-Longitudinal positioning bolt; 11-Flange to be installed; 12-Flange rib plate to be installed. Detailed Implementation

[0032] Example 1

[0033] The technical solution of this invention is: a method for pre-assembling a steel structure with center registration, comprising the following steps:

[0034] S1: Data is collected from each of the multiple steel structure segments to be assembled. The data collection method is to perform limited measurement on key measuring points of the steel structure segments or to perform three-dimensional scanning measurement on the entire steel structure segment.

[0035] S2: Process the collected data of multiple steel structure segments to be assembled. Specifically, reconstruct the virtual space of each steel structure segment, establish the data model of the steel structure segment, and perform translation and rotation operations on the data models of adjacent steel structure segments so that the line connecting the center points of the end faces of the steel structure segments matches and connects according to the design position, realize the pre-assembly simulation in the virtual space, and obtain the layout parameters of the flanges to be installed between the steel structure segments to be assembled.

[0036] S3: Install the joint self-holding adjustment device at the connection end 2 to be installed on the steel structure segment, and adjust the joint self-holding adjustment device according to the layout parameters of the flange to be installed obtained in step S2. Adjust and fix the flange to be installed in the layout position. After verification, the matching and installation of the flange to be installed is completed.

[0037] S4: Remove the self-holding adjustment device of the joint, move the installed steel structure segment, and wait for hoisting.

[0038] like Figure 1As shown, in step S1, data is collected from multiple steel structure segments to be assembled. During data collection and measurement, the steel structure segments to be assembled must be in the same placement state, that is, simultaneously maintain a vertical placement state or a side-lying placement state, in order to eliminate the influence of deflection under different states.

[0039] like Figure 5 As shown, in step S1, data is collected from multiple steel structure segments to be assembled. The data collection method is traditional measurement technology. The specific process is as follows: Before collecting data from multiple steel structure segments to be assembled, the layout measurement points of the steel structure segments and the flange 11 to be installed must be marked. There are more than three layout measurement points for the key sections. After marking the key measurement points of the key sections on the steel structure segments to be measured, coordinate point measurements are performed. The relative positions between key sections within the overall steel structure segment are determined based on the measured coordinates of the key points. The key sections are selected as the first and last section of the steel structure segment to be measured or other design control sections. The relevant measurement points must include, but are not limited to, the layout measurement points. During the measurement process, all measurement points of the same segment must be in the same coordinate system. (See reference...) Figure 1 In the coordinate system of the segmented side-lying placement, the y-axis is the direction from the upper chord of the steel structure segment to the lower chord, the x-axis is the direction from the end to be installed (2) to the end already installed (1), and the z-axis is the direction perpendicular to the x and y axes and pointing upwards. In step S2, the model formed by the connection of key measuring points from step S1 is used as the processing object. First, the model formed by the connection of key measuring points is initially placed in position according to the design orientation and state. The connection of the center points of the key sections of each steel structure segment is extracted as the measured alignment of the steel structure segment. The included angle parameters of the design alignment are input. Using the measured alignment as a reference, the data model is deflected according to the design included angle to complete the virtual pre-assembly matching. The specific conversion process involves coordinate system transformation, data rotation, and translation. Taking the xy plane as an example, the coordinate system transformation can be referenced... Figure 7 For formula (1), the data coordinate rotation can be referenced. Figure 8 And formula (2), data coordinate translation reference formula (3); then establish as follows on the connection end 2 to be installed, with each pipe opening as the reference. Figure 2 The local coordinate system shown has the line connecting 1 and 2 as the y-axis, the line perpendicular to the y-axis and parallel to the line connecting 4 and 3 as the z-axis, and the flange direction perpendicular to both the y and z axes as the x-axis. The respective pipe opening layout point data are converted to the local coordinate system to calculate their respective relative positions or distance parameters.

[0040]

[0041]

[0042]

[0043] like Figures 2-4As shown, for a steel structure with a circular cross-section, four layout measuring points are set up: measuring points 1, 2, 3, 4, 1', 2', 3', and 4' are located at the four circumference points of each pipe opening and flange 11 to be installed on the steel structure segment, respectively.

[0044] In step S1, data is collected from each of the multiple steel structure segments to be assembled. The data collection method is three-dimensional laser scanning measurement, such as... Figure 6 As shown, a three-dimensional laser scanning measurement is performed on the entire steel structure segment to be measured to obtain a point cloud data model of the overall planar distribution of the steel structure segment. The target spheres in the overlapping areas of the point cloud data from each station of the three-dimensional scanning must be identifiable and coincident. In step S2, the point cloud data model obtained from the three-dimensional laser scanning in step S1 is used as the processing object. First, the measured point cloud data model is registered with the design point cloud model. The spatial geometric relationship of the design model is used to determine the matching posture of the point cloud models of adjacent steel structure segments. The center points of the key sections of the steel structure segments are extracted for registration and adjustment to complete the pre-assembly of the data model. Then, the outlines and key points of the installed flanges and their bolt holes are extracted to determine the key control points for flange layout. Finally, a local coordinate system is established based on each pipe opening of the steel structure segment to be installed. The point cloud data of the pipe opening range of the steel structure segment is transformed into the local coordinate system to obtain the relative position or distance parameters of the layout points of each pipe opening of the steel structure segment.

[0045] Example 2

[0046] like Figure 9 , Figure 10 As shown, a self-holding device for pre-assembled steel structure joints includes a cross frame 4. Self-holding clamps 3 are respectively provided at the ends of the cross rods of the cross frame 4. Adjustment bolts 6 are respectively provided in the middle of the cross rods of the cross frame 4. Positioning sliders 5 are provided on the cross rods of the cross frame 4 between the adjustment bolts 6 and the self-holding clamps 3. Longitudinal positioning bolts 10 are provided on the positioning sliders 5 perpendicular to the cross rods of the cross frame 4. Locking bolts 7 are provided on the positioning sliders 5 parallel to the cross rods of the cross frame 4. One end of the locking bolt 7 is movably connected to the positioning slider 5, and the other end is fixedly connected to the self-holding clamps 3.

[0047] This invention first uses a self-holding clamp 3 to fix the self-holding clamp 3 to the designed position of the connection end to be installed. Then, the cross frame 4, positioning slider 5, and corresponding nuts 9 are installed. The positioning slider 5 and corresponding nuts 9 are installed sequentially onto the cross frame 4. Then, the steel pipe of the cross frame 4 is inserted into the reserved hole of the self-holding clamp 3 to complete the fixed connection. The frame center bolt 8 is screwed into the center of the cross where the steel pipes intersect. The adjusting bolt 6 passes through the cross frame 4 to complete the assembly of the device. After the device is assembled, the layout parameters need to be obtained by virtual assembly simulation based on the measured data. Then, the flange to be installed is placed into the preset groove of the positioning slider 5. The longitudinal position of the flange to be installed and the tilt angle of the pipe opening to be held are adjusted by adjusting the extension length of the adjusting bolt 6. The longitudinal positioning bolt 10 is tightened to tighten the flange to be installed. The corresponding nuts 9 of the remaining positioning slider 5 are tightened to complete the welding of the flange rib plate 11. Finally, the device is removed.

[0048] Example 3

[0049] Based on Embodiment 2, in this embodiment, preferably, the cross frame 4 includes two steel pipes of the same length, the two steel pipes are arranged vertically, and a frame center bolt 8 is provided at the center connection of the two steel pipes.

[0050] The cross frame 4 of the present invention includes two steel pipes of the same length, which are arranged vertically. A frame center bolt 8 is provided at the center connection of the two steel pipes. The frame center bolt 8 facilitates the assembly and disassembly of the cross frame 4. When not in use, the cross frame 4 can be disassembled to save storage space.

[0051] Example 4

[0052] Based on Example 3, in this embodiment, preferably, the steel pipe includes a first section of steel pipe, a second section of steel pipe, a third section of steel pipe... a seventh section of steel pipe, totaling seven sections. The seven sections of steel pipe are connected by welding. The thickness of the steel pipe in the odd-numbered sections is greater than the thickness of the steel pipe in the even-numbered sections. The surface of the steel pipe in the odd-numbered sections is provided with threads.

[0053] The steel pipe of the present invention includes a first section of steel pipe, a second section of steel pipe, a third section of steel pipe, ... a seventh section of steel pipe, totaling seven sections. The seven sections of steel pipe are connected by welding. The thickness of the steel pipe in the odd-numbered sections is greater than that in the even-numbered sections, so as to provide space for engraving threads. The surface of the steel pipe in the odd-numbered sections is provided with threads for the nuts 9 to be used for fastening and locking.

[0054] Example 5

[0055] Based on Embodiment 2 or Embodiment 3, in this embodiment, preferably, the positioning slider 5 is L-shaped, the cross rod of the cross frame 4 passes vertically through one side of the long side of the L-shaped positioning slider 5, a nut 9 is provided at the contact point between the cross rod of the cross frame 4 and the long side of the L-shaped positioning slider 5, a groove is provided on the positioning slider 5 near the short side of the nut 9, and a longitudinal positioning bolt 10 is provided on one side of the short side of the L-shaped positioning slider 5.

[0056] The positioning slider 5 of this invention is L-shaped. The cross bar of the cross frame 4 passes vertically through one of the long sides of the L-shape of the positioning slider 5. A nut 9 is provided at the contact point between the cross bar of the cross frame 4 and the long side of the L-shape of the positioning slider 5. A groove is provided on the positioning slider 5 near the short side of the nut 9. A longitudinal positioning bolt 10 is provided on one side of the short side of the L-shape of the positioning slider 5. The positioning slider 5 is a steel irregularly shaped block, and the radial position of the flange to be installed can be adjusted by sliding it on the cross bar track of the cross frame 4.

[0057] Example 6

[0058] Based on Embodiment 2 or Embodiment 5, in this embodiment, preferably, the self-holding clamp 3 is concave and includes two composite plates of the same shape and size and multiple fixing bolts. The composite plate has a double-layer structure, including a steel layer and a rubber layer. The steel layer is a rectangular straight steel plate, and the rubber layer has a double-layer stepped structure. The multiple fixing bolts pass through the thicker side of the double-layer stepped structure of the rubber layer of the composite plate to fix the two composite plates together.

[0059] The self-holding clamp 3 of this invention adopts a double-layer composite plate structure. The outer steel layer ensures the structural rigidity of the self-holding clamp 3, and the inner rubber layer adopts a double-layer stepped structure. The rubber layer can be replaced and can adapt to the holding of different pipe wall thicknesses and arc-shaped pipe openings.

[0060] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A self-holding device for a joint, characterized by: The system includes a cross frame (4), with self-holding clamps (3) at the ends of the cross rods of the cross frame (4). Adjustment bolts (6) are provided in the middle of the cross rods of the cross frame (4). A positioning slider (5) is provided on the cross rod of the cross frame (4) between the adjustment bolt (6) and the self-holding clamp (3). The positioning slider (5) is provided with a longitudinal positioning bolt (10) perpendicular to the cross rod of the cross frame (4). The positioning slider (5) is provided with a locking bolt (7) parallel to the cross rod of the cross frame (4). One end of the locking bolt (7) is movably connected to the positioning slider (5), and the other end is fixedly connected to the self-holding clamp (3).

2. A self-holding device for a joint according to claim 1, characterized in that: The cross frame (4) includes two steel pipes of the same length, which are arranged vertically, and a frame center bolt (8) is provided at the center connection of the two steel pipes.

3. A self-holding device for a joint according to claim 2, characterized in that: The steel pipe includes a first section, a second section, a third section, and a seventh section, totaling seven sections. The seven sections are connected by welding. The thickness of the odd-numbered sections is greater than that of the even-numbered sections, and the surface of the odd-numbered sections is threaded.

4. The self-holding device for a connector according to claim 1, characterized in that: The positioning slider (5) is L-shaped. The cross bar of the cross frame (4) passes vertically through one side of the long side of the L-shaped positioning slider (5). A nut (9) is provided at the contact point between the cross bar of the cross frame (4) and the long side of the L-shaped positioning slider (5). A groove is provided on the positioning slider (5) near the short side of the nut (9). A longitudinal positioning bolt (10) is provided on one side of the short side of the L-shaped positioning slider (5).

5. The self-holding device for a connector according to claim 1, characterized in that: The self-holding clamp (3) is concave and includes two composite plates of the same shape and size and multiple fixing bolts. The composite plate has a double-layer structure, including a steel layer and a rubber layer. The steel layer is a rectangular straight steel plate, and the rubber layer has a double-layer stepped structure. The multiple fixing bolts pass through the thicker side of the double-layer stepped structure of the rubber layer of the composite plate to fix the two composite plates together.

6. A method for pre-assembling a steel structure based on center registration of the self-holding joint device as described in any one of claims 1 to 5, characterized in that: Includes the following steps: S1: Data is collected from each of the multiple steel structure segments to be assembled. The data collection method is to perform limited measurement on key measuring points of the steel structure segments or to perform three-dimensional scanning measurement on the entire steel structure segment. S2: Process the collected data of multiple steel structure segments to be assembled. Specifically, reconstruct the virtual space of each steel structure segment, establish the data model of the steel structure segment, and perform translation and rotation operations on the data models of adjacent steel structure segments so that the connection line of the center point of the end face of the steel structure segment matches and connects according to the design position, realize the pre-assembly simulation in the virtual space, and obtain the layout parameters of the flange (11) to be installed between the steel structure segments to be assembled. S3: Install the joint self-holding device at the connection end (2) of the steel structure segment to be installed, and adjust the joint self-holding device according to the layout parameters of the flange to be installed obtained in step S2. Adjust and fix the flange to be installed in the layout position. After verification, complete the matching and installation of the flange to be installed. S4: Remove the self-holding device of the joint, move the installed steel structure segment, and wait for hoisting.

7. The method for pre-assembly of a steel structure with center registration according to claim 6, characterized in that: In step S1, data is collected from the multiple steel structure segments to be assembled. During the data collection and measurement, the steel structure segments to be assembled must be in the same placement state, that is, simultaneously maintaining a vertical placement state or a side-lying placement state.

8. The method for pre-assembling a steel structure with center registration according to claim 6, characterized in that: In step S1, data is collected from the multiple steel structure segments to be assembled. The data collection method is limited measurement. The specific process is as follows: Before collecting data from the multiple steel structure segments to be assembled, the layout measurement points of the steel structure segments and the flange (11) to be installed are marked. The layout measurement points of the key sections of the flange (11) to be installed and the steel structure segments are more than three. After marking the key measurement points of the key sections on the steel structure segments to be measured, coordinate point measurement is performed. The relative positions between the key sections within the overall steel structure segments are determined based on the measured coordinates of the key points. The key sections are selected from the first and last sections of the steel structure segments to be measured and other design control sections. The relevant measurement points include, but are not limited to, the layout measurement points. During the measurement process, the same Each measuring point of the segment must be in the same coordinate system; in step S2, the model formed by the connection of the key measuring points measured in step S1 is used as the processing object. First, the model formed by the connection of the key measuring points is initially placed in place according to the design orientation and state. The connection of the center points of the key sections of each steel structure segment is extracted as the actual line shape of the steel structure segment. The included angle parameter of the design line shape is input. The data model is deflected according to the design included angle based on the actual line shape to complete the virtual pre-assembly matching. Then, a local coordinate system is established at the connection end to be installed (2) with the pipe opening of each steel structure segment as the reference. The layout point data of the pipe opening of each steel structure segment is converted to the local coordinate system, and the relative position or distance parameter of the layout point of the pipe opening of each steel structure segment is given.

9. The method for pre-assembling a steel structure with center registration according to claim 8, characterized in that: For a steel structure with a circular cross-section, four layout measurement points are set for each cross-section, at the four sub-points of the circle of each pipe opening and the flange to be installed (11) of the steel structure segment.

10. The method for pre-assembling a steel structure with center registration according to claim 6, characterized in that: In step S1, data is collected from multiple steel structure segments to be assembled using three-dimensional laser scanning technology. The entire steel structure segment is scanned using three-dimensional laser scanning to obtain a point cloud data model showing the overall planar distribution of the steel structure segment. The point cloud data from each station in the three-dimensional scan must ensure that the target spheres in overlapping areas can be identified and coincident. In step S2, using the point cloud data model obtained from the three-dimensional laser scan in step S1 as the processing object, the measured point cloud data model is first registered with the design point cloud model. The spatial geometric relationship of the design model is used to determine the matching posture of the point cloud models of adjacent steel structure segments. The center points of key sections of the steel structure segments are extracted for registration and adjustment, completing the pre-assembly of the data model. Subsequently, the outlines and key points of the installed flanges and their bolt holes are extracted to determine the key control points for flange layout. Finally, a local coordinate system is established based on the pipe openings of the steel structure segments to be installed. The point cloud data of the pipe opening range of the steel structure segments is converted to the local coordinate system to obtain the relative position or distance parameters of the layout points of each pipe opening of the steel structure segments.

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