A method for welding a steel tower shell of a steel-concrete composite tower

Abstract

The present application relates to a kind of steel shell concrete combination tower steel tower shell welding manufacturing method, the steel tower shell is by inner wall board, outer wall board, stiffener, connecting angle steel, reinforcing bar is constituted;Wallboard unit uses different welding method and deformation control method;Steel tower shell block is assembled using long line method, curve section is made into profiled tire, and steel tower shell section block is assembled using horizontal assembly method;Steel tower section is assembled using three-dimensional assembly method, and the shape size of section is effectively controlled by special inner mold tire frame and support system;Steel tower section is adjusted by guide fast and temporary matching part, and the matching degree between section is improved;The assembly process is compared with computer simulation assembly result, and assembly size and linear shape are strictly controlled;The method can effectively control the welding deformation and size precision of wallboard unit, can effectively control the matching problem between steel tower shell block and section, can solve the technical problem in steel tower shell welding manufacturing, and improve product size precision and weld quality.

Description

Technical Field

[0001] This invention relates to the field of bridge steel structure manufacturing, and in particular to a welding manufacturing method for the steel tower shell of a steel-concrete composite tower. Background Technology

[0002] As cable-stayed bridges grow larger and their tower heights increase, both single steel and reinforced concrete towers have revealed various drawbacks. The advantages of steel-concrete composite tower construction have become apparent: compared to steel towers, with the same external dimensions, the compressive stiffness can be increased by six times, while the steel consumption is only one-third that of steel towers. Simultaneously, fatigue cracking is reduced, enhancing the bridge's durability. Compared to reinforced concrete towers, with the same cross-sectional dimensions, the stiffness of steel-concrete composite towers can be increased by 33%.

[0003] Chinese Patent Application CN109290739 B: A manufacturing process for a spatially curved steel tower segment, applicable to the manufacture of single steel tower structures. Chinese Patent Application CN110952448 A: A construction method for a steel-shell concrete composite cable tower, providing an on-site casting construction process for hybrid towers, applicable to on-site casting construction of hybrid towers.

[0004] The aforementioned welding patent is not applicable to the welding and manufacturing of the steel tower shell of a steel-concrete composite tower and is fundamentally different from this patent. The steel tower shell of a steel-concrete composite tower is generally composed of inner wall panels, outer wall panels, stiffening ribs, connecting angle steel, and reinforcing bars. The inner wall panels are hollow in the middle and often have irregular curved shapes. The inner wall panels are relatively thin, and the wall panel units are densely covered with horizontal and vertical stiffening ribs. Deformation control during the manufacturing process of the panel units is difficult, the steel shell segments have low stiffness, and deformation is difficult to control during assembly and welding, resulting in problems such as poor matching between blocks and segments. A detailed welding manufacturing process is needed to solve these problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a welding manufacturing method for the steel tower shell of a steel-concrete composite tower. This method can effectively control the welding deformation and dimensional accuracy of the wall panel units, effectively control the matching problem between steel tower shell blocks and segments, solve the technical problems in the welding manufacturing of steel tower shells, and improve the dimensional accuracy and weld quality of the product.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a welding manufacturing method for the steel tower shell of a steel-concrete composite tower, the innovation of which is: specifically including the following steps: S1: Welding and fabrication of steel tower shell panel units: The steel tower shell wall panel rib bolting holes are used to assemble and weld C-shaped and I-shaped steel shell wall panel units on different jigs. Different welding methods and welding equipment are used during welding to control and correct the welding deformation of the steel shell wall panel units. S2: Welding and manufacturing of steel tower shell segments: The assembly jig uses adjacent steel tower shells to be continuously matched and manufactured. The steel tower shell segments are assembled using a horizontal assembly method. A marker tower is set outside the jig to detect the positioning benchmark and the dimensions and alignment of the steel tower shell segments during assembly. S3: Welding and manufacturing of steel tower shell segments: The steel tower shell segments are assembled on a jig using a three-dimensional assembly method. The positioning data of the steel tower shell blocks are measured, and the measured data is compared with the pre-assembly data simulated by the computer. After adjustment and positioning, the positioning is achieved using a support plate. The vertical butt welds of the tower wall panels are preferably welded using welding robots. S4: Welding and manufacturing of the overall assembly of the steel tower shell bridge site: When positioning steel tower segments, the horizontal and vertical baselines of the installed previous steel tower shell segment and the baseline of the laid jig are used as references for positioning; the tower segments are adjusted by guide blocks and temporary matching parts; when welding the circumferential seams of the steel tower, multiple people and multiple points are welded simultaneously.

[0007] Furthermore, the bolt holes for the steel tower shell wall panels are drilled using a pre-drilling method, while the spliced ​​plates are drilled using a post-drilling method; C-shaped and I-shaped steel shell wall panel units are assembled and welded on different jigs; the straight section steel shell wall panel units are automatically welded using a reverse deformation jig-mounted robot; the curved section wall panels are welded on the jig using a back-assembly process with partitions, and semi-automatic welding using solid wire gas shielded welding; automated mechanical cold straightening is achieved using a CNC straightening machine, and flame straightening is used for some local deformations; some welds on the inner wall panel units of the steel tower are first splatter welded to control deformation.

[0008] Furthermore, to ensure the accuracy of the bridge connection between corresponding segments, a long-line assembly method is adopted on the assembly jig, where adjacent steel tower shell segments are continuously matched and pre-assembled simultaneously. A contour jig is made, and the steel tower shell segments are assembled using a horizontal assembly method. Independent baselines, base points, and measuring marker towers are set outside the jig to continuously inspect the positioning references on the jig and the dimensions and alignment of the steel tower columns during assembly. The welding sequence is adjusted based on the inspection results.

[0009] Furthermore, the steel tower shell segments are assembled on assembly jigs using a three-dimensional assembly method, with a dedicated inner mold jig and support system. When positioning the steel tower blocks, the baseline of the laid jig is used as a reference, and a theodolite is used for alignment and assembly. The measured data is compared with the pre-assembly data simulated by the computer, and after adjustment, the positioning is achieved using a support plate. The vertical butt welds of the tower wall panels are preferentially welded using a MICROBO rail-mounted welding robot, and the welds that cannot be welded by a robot can be welded manually.

[0010] Furthermore, when positioning the steel tower segments, the horizontal and vertical baselines of the installed previous steel tower shell segment and the baseline of the laid jig are used as references, and the theodolite and laser tracker are used for measurement and positioning. Guide blocks and temporary matching parts are set at the circumferential weld of the steel tower segment. The tower segment is adjusted by the guide blocks and temporary matching parts. After the assembly tolerance meets the design requirements, the temporary matching parts are locked for positioning welding. When welding the circumferential weld of the steel tower, multiple people and multiple points are welded simultaneously. The welding process adopts a multi-layer and multi-pass welding method, and the weld beads are reasonably arranged during the welding process.

[0011] The advantages of this invention are: 1) In this invention, the bolt holes of the plate ribs are made using the pre-hole method, and the splicing plates are made using the post-hole method; the C-shaped block and the straight block steel shell wall panel units are welded using different welding methods, different deformation control methods are used during the welding process, and different correction methods are used after welding; for the thinner inner wall panel, partial weld slip welding is used to control welding deformation.

[0012] 2) The steel tower shell blocks are assembled using the long-line method, which can effectively ensure the longitudinal matching relationship between the blocks; the steel tower shell segments are assembled using the horizontal assembly method by making a conformal mold, and by setting independent baselines, base points and measuring marker towers outside the mold, the size and shape during assembly can be effectively controlled.

[0013] 3) The steel tower shell segments are assembled using a three-dimensional assembly method. The external dimensions of the segments can be effectively controlled through a special internal mold frame and support system. The vertical butt welds of the wall panels are preferably welded using MICROBO rail-type welding robots, resulting in high and stable weld quality.

[0014] 4) Guide blocks and temporary matching parts are installed at the circumferential welds of the steel tower segments. The steel tower shell segments are adjusted by the guide blocks and temporary matching parts to improve the matching degree between segments. When welding the circumferential welds of the steel tower, multiple people and multiple points are welded simultaneously to reduce the internal stress of the circumferential weld and improve the weld quality. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the segmented steel tower shell described in this invention.

[0017] Figure 2 This is the steel tower shell welding manufacturing process described in this invention.

[0018] Figure 3 This is a line drawing of the steel tower shell wall panel unit described in this invention.

[0019] Figure 4 This is a schematic diagram of the welding sequence of the straight segment wall panel unit described in this invention.

[0020] Figure 5 This is a schematic diagram of the process partition of the curved segment wall panel unit described in this invention.

[0021] Figure 6 This is a schematic diagram of the welding sequence of the curved segment wall panel unit described in this invention.

[0022] Figure 7 This is a schematic diagram comparing the surveying data described in this invention with the designed digital 3D model.

[0023] Figure 8 This is a schematic diagram of the welding and sling welding of the inner wall panel unit of the steel tower shell according to the present invention.

[0024] Figure 9 This is a schematic diagram of the reverse deformation of the "two-in-one" welding of the wall panel unit described in this invention.

[0025] Figure 10 This is a schematic diagram of the horizontal assembly frame for the steel tower shell block described in this invention.

[0026] Figure 11 This is a schematic diagram of the conformal tire described in this invention.

[0027] Figure 12 This is a schematic diagram of the continuous matching and assembly manufacturing of multi-segment blocks of the steel tower shell described in this invention.

[0028] Figure 13 This is a schematic diagram of the arrangement of the steel tower shell segmental assembly measurement base station according to the present invention.

[0029] Figure 14 This is a schematic diagram of the special jig and support system for assembling steel tower shell segments according to the present invention.

[0030] Figure 15 This is a schematic diagram of the arrangement of the temporary matching parts and guide blocks for the steel tower shell described in this invention.

[0031] Figure 16 This is a schematic diagram of multiple people performing segmented welding between steel tower shell sections as described in this invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] like Figure 1 As for Figure 16 As shown: The steel tower shell is divided into segmental blocks. A schematic diagram of the segmented steel tower shell is shown below. Figure 1 The steel tower shell is divided into different segments according to manufacturing and installation needs. The wall panels between segments are welded together, and the longitudinal stiffening ribs are bolted together. The segments are composed of blocks, which are divided into C-shaped blocks and straight blocks according to their structural form. The blocks are composed of wall panel units, angle steel and connecting stiffening ribs. The wall panel unit is composed of wall panels and horizontal and vertical stiffening ribs. The stiffening ribs are PBL plates with steel bar holes. According to their position, they are divided into inner wall panel units and outer wall panel units. According to their structural form, they are divided into straight segment plate units and curved segment plate units.

[0035] A method for welding and manufacturing the steel tower shell of a steel-concrete composite tower, wherein the manufacturing of the steel tower shell consists of four steps (see below). Figure 2 S1: Welding and manufacturing of steel tower shell wall panel units; S2: Welding and manufacturing of steel tower shell blocks; S3: Welding and manufacturing of steel tower shell segment assembly; S4: Welding and manufacturing of steel tower shell bridge site assembly.

[0036] S1: Due to the large cross-section and numerous connecting holes in the tower section, the post-drilling method cannot be used with CNC equipment. In order to ensure the accuracy of the holes in the longitudinal ribs of the tower section and reduce or avoid the influence of human factors on the drilling process, the plate ribs adopt the pre-drilling method, which uses a covered mechanical template for drilling, and the hole groups at both ends are reserved for shrinkage. This scheme can make the hole spacing at the extreme edges of the plate ribs synchronous and reduce the types of splicing plates. After the tower section blocks are pre-assembled and measured, the hole spacing of adjacent sections is measured to determine the position of the splicing plate bolt holes. Based on the data, the splicing plate holes are drilled using CNC.

[0037] Assemble the steel shell panel units on a dedicated jig, first marking the horizontal and vertical baselines as shown below. Figure 3Strictly control the verticality of the horizontal and vertical baselines. The vertical baseline serves as the reference for aligning the vertical stiffening ribs, while the horizontal baseline serves as the reference for controlling the concentricity of the rib holes in the perforated plate with the same cross-section. During plate and rib assembly, a magnetic linear positioning adjuster is used for non-motorized assembly. The spacing of the stiffening ribs at both ends and the partition plate position is carefully controlled. Plate and rib welding can only be carried out after the inspection is qualified.

[0038] The straight-section steel shell wall panel units were welded using an anti-deformation tire-mounted robot for automated welding. (See attached image) Figure 4 The plate unit is secured to the anti-deformation jig, with pre-set anti-deformation welding to reduce post-weld trimming. The jig is tilted at approximately 38°. A welding robot is used in conjunction with the anti-deformation welding position. Barrel-packed T492T1-0C1A (Φ1.4mm) flux-cored welding wire is used. Arc tracking technology is employed to minimize welding deformation. Post-weld release temperature is controlled to ensure welding quality. Welding is performed symmetrically from the center of the plate unit's width outwards. After one side's weld is completed, the jig is flipped, and the other side's fillet welds are welded in the same sequence. All welds are performed in the same direction. After the plate unit is trimmed, horizontal stiffening ribs are assembled, and fillet welds are welded between the horizontal stiffening ribs and the wall panels and vertical stiffening ribs, symmetrically from the center of the plate unit outwards.

[0039] Before assembling the curved section wall panel unit, check the curvature of the wall panel. Welding can only proceed after the curvature meets the requirements. A process partition is installed on the non-rib side of the wall panel. The wall panel with the process partition is placed on the conformal jig, ensuring a tight fit between the wall panel and the jig frame ribs to prevent deformation during rib welding. See [link / details]. Figure 5 Semi-automatic gas-shielded welding was used, with G49A3C1S6 (Φ1.2mm) solid welding wire. The fillet welds between the stiffening ribs and the wall panel were applied. A schematic diagram of the welding sequence is shown below. Figure 6 Vertical stiffeners should be welded first, followed by horizontal stiffeners. Welding should be performed symmetrically from the middle of the plate unit outwards, with similar welds welded in the same direction. Vertical fillet welds should be welded between the vertical and horizontal stiffeners. Process partitions should be retained until the steel tower shell blocks are welded and then removed.

[0040] Inspection of welded components of bent and twisted plate units, see Figure 7 After the bending and twisting plate unit is welded, a laser tracker is used to collect data on the curved surface feature points of the steel plate, and the data is entered into the system. Software is used to simulate the shape and compare it with the designed digital 3D model, and then the bending and twisting of the steel plate is corrected. Simultaneously, an adjustable arc-shaped inspection template is used for testing to ensure that the steel plate twists smoothly.

[0041] Even after welding, the plate units still exhibit some deformation. Automated mechanical cold straightening is achieved using a CNC straightening machine. This machine uses image recognition to intelligently sense flatness, ensuring the flatness of the straightened plate units is within 1mm. For some curved plate units and areas with localized deformation, flame straightening is used. The hot straightening temperature should be controlled between 600 and 800℃, and overheating is strictly prohibited. After straightening, the parts should be cooled slowly. Before reaching room temperature, the steel should not be hammered or rapidly cooled with water. The heating methods for hot straightening can be categorized as point heating, line heating, and triangular heating.

[0042] Deformation control of the inner wall panel units of the steel tower shell, see Figure 8 To better control the welding deformation of the thin plate units, a method is adopted where some welds are pre-welded during the welding of the plate units. After the blocks are assembled, the rigidity of the entire plate unit is increased before welding. Specifically, during welding, the welds between the vertical ribs and the wall panels are welded first, followed by the welds on one side between the horizontal ribs and the vertical ribs, and then the welds between the horizontal ribs and the wall panels. The welds on the other side between the horizontal ribs and the vertical ribs are welded after the welding of the block angle steel and the horizontal and vertical ribs is completed.

[0043] S2: On the assembly platform, use the horizontal and vertical baselines as a reference to perform "two-to-one" assembly of plate units, focusing on controlling the distance between the horizontal and vertical baselines and the anti-deformation settings for the two-to-one assembly. See Figure 9 To reduce welding deformation, measure the hole spacing between adjacent segments and ensure synchronization of the reference head plate rib holes.

[0044] The steel tower shell segments are assembled using a horizontal assembly method. Independent baselines, benchmarks, and survey marker towers are installed outside the frame; see [link / details]. Figure 10 The positioning reference points on the jig and the dimensions and alignment of the steel tower columns during assembly are constantly inspected, and adjustments are made based on the inspection results. Sufficient stops are installed at the contact points between the blocks and the platform to fix them on the horizontal plane. The jig is equipped with elevation adjustment components to adjust the alignment changes of each block.

[0045] Preferably, the curved segment block is used to make the contouring mold. The adjustable contouring mold consists of transverse ribs and longitudinal ribs, see... Figure 11 Horizontal ribs are installed at the bending lines and both ends of the plate unit. The elevation values ​​of the top surface of each end of the horizontal rib are calculated using the corresponding coordinate data in the construction drawings. The adjustable conformal jig composed of horizontal ribs achieves the bending and twisting shape of the bottom of the main plate of the plate unit. To maintain the stability of the jig shape, longitudinal ribs can be added for connection and reinforcement. According to the finite element principle, as long as the wall panel and the jig frame ribs are tightly fitted, the correctness of the wall panel shape can be confirmed. The horizontal ribs can be adjusted according to the coordinates and can be disassembled and reused in plate unit jig frames for other coordinates.

[0046] To ensure the accuracy of the bridge connection between corresponding segments, a "long-line method" assembly was adopted on the assembly jig, in which the continuous matching and pre-assembly of multiple segments of adjacent steel tower shells were completed simultaneously. (See...) Figure 12First, the steel tower plate units and components are manufactured by horizontal continuous matching on the assembly jig. Each round of assembly consists of four segments. After the pre-assembly of the previous round is completed, one block is left to participate in the next pre-assembly. Both C-shaped and I-shaped blocks are continuously matched and assembled in a bottom-up order. After passing the test, the first three segments are disassembled and removed from the jig for steel tower shell segment assembly and welding.

[0047] Using the longitudinal and transverse baselines of the jig as a reference, position the outer wall panel units sequentially. During segmental assembly, use the reference end as the reference point. For segments with added width, use the bevel edge as the reference point. For segments without added width, use the reference edge and reference head of the outer wall panel unit as references for positioning. Before positioning, prepare a ground survey line below the platform. Assemble the inner wall panel units, temporary process supports, angle steel, and reinforcing steel binding. First, complete the welding of the angle steel to the horizontal and vertical ribs, then complete the welding of the remaining parts of the vertical and horizontal ribs. After the segmented welding is completed, mark the lines and cut the process allowance.

[0048] S3: To ensure the quality of bridge site installation, the steel tower shell segments are assembled using a three-dimensional assembly method on an integrated assembly platform system. A three-dimensional measurement control network is deployed in the steel tower assembly area. (See...) Figure 13 The three-dimensional coordinates of monitoring points during the three-dimensional assembly of steel tower shell segments were measured and the data was analyzed. The data was compared with the pre-assembly data from computer simulation, and after adjustment, positioning was achieved using a guide plate. Vertical butt welds of the tower wall panels were preferentially welded using a MICROBO rail-mounted welding robot. Welds that could not be welded by a robot were welded manually, using flux-cored welding wire T492T1-1C1A (Φ1.2mm).

[0049] Preferably, a dedicated jig frame and support system are designed, see Figure 14 A crosshair is marked on the overall assembly platform as the positioning reference between blocks. The support system is arranged in the hollow area inside the segment, and the depth of the support system's action point is adjustable to adapt to changes in the external dimensions of different segments. It also serves to reinforce the ends and ensure dimensional accuracy. The blocks are hoisted into place and precisely positioned, then fixed by the internal support system.

[0050] Preferably, a leveling control network (leveling points) and a horizontal alignment control network (ground samples), along with a Leica laser tracking measurement system detection station, are established outside the jig to prevent interference from other factors. Positioning is achieved based on the horizontal and vertical ground sample lines of the three-dimensional pre-assembly control network, the steel tower segment positioning system lines, and measuring points. Theodolites and the Leica laser tracking measurement system are used to measure the verticality of the four-sided system lines of the steel tower shell, the overall assembly dimensions of the steel tower segments, and the cross-sectional elevation of the steel tower segments. After processing, the actual axis graphics and data of the components are obtained, enabling the detection of the steel tower shell height, verticality, rebar alignment rate, and segment bending. The measured data are compared with the computer-simulated pre-assembly data. After adjusting the dedicated jig and support system into place, positioning is achieved using a support plate.

[0051] Preferably, the vertical butt welds of the tower wall panels are welded using a MICROBO rail-mounted welding robot. This achieves precise weld positioning, automated welding, automatic acquisition of workpiece information, and automatic generation of welding programs. This ensures stable weld quality and aesthetically pleasing weld formation. Welds that cannot be welded by a robot can be welded manually.

[0052] S4: Using the horizontal and vertical baselines of the already installed steel tower shell segments as a reference, a laser tracker is used to measure and position the next steel tower shell segment to be installed sequentially. The results are compared and adjusted with the computer simulation assembly results, with a focus on controlling the overall dimensions, verticality, misalignment of inter-segment plate units, and cross-sectional elevation of the steel tower shell. After the allowable deviations meet the design requirements, the steel tower blocks are positioned and fixed using temporary matching parts and process plates. The lower end face and its bevel are protected with tooling. After passing the inspection, the positioning plate is welded, and the circumferential weld is then performed.

[0053] Preferably, the steel tower shell segment is equipped with guide blocks and temporary matching parts, see Figure 15 The top surface of each matching component is marked with clear elevation and planar measuring points for tower segment positioning measurement control at the bridge site. Guide blocks and temporary matching components are located inside the housing, facilitating the protection of the outer wall coating and base material at the circumferential joint of the steel tower shell. Simultaneously, the end face of the temporary matching component connecting to the bottom side segment of the tower extends beyond the end face of the tower segment. The tooling for structural matching protects the bottom end face and bevel of the steel tower shell during segment transfer and shipping, preventing damage. The guide blocks effectively position the steel tower shell segment, and the temporary matching components are secured with bolts after positioning.

[0054] Preferably, the welding sequence of the circumferential seam is controlled, see Figure 16 First, weld the butt joint of the inner wall panel, then weld the butt joint of the outer wall panel. When welding, follow the principle of symmetrical welding and multiple people welding in sections, and then bolt the longitudinal stiffening ribs.

[0055] As can be seen from the above description and practice, the welding manufacturing method of the steel tower shell of the steel-concrete composite tower according to the present invention can effectively control the welding deformation and dimensional accuracy of the wall panel unit, effectively control the matching problem between steel tower shell blocks and segments, solve the technical problems in the welding manufacturing of steel tower shell, and improve the dimensional accuracy and weld quality of the product.

[0056] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A method for welding and manufacturing the steel tower shell of a steel-concrete composite tower, characterized in that: Specifically, the steps include the following: S1: Welding and fabrication of steel tower shell panel units: The bolt holes of the steel tower shell wall panel are processed to produce holes. C-shaped blocks and straight blocks of steel shell wall panel units are assembled and welded on different assembly jigs. Different welding methods and welding equipment are used during welding to control and correct the welding deformation of the steel shell wall panel units. The bolt holes for the steel tower shell wall panels are drilled using a pre-drilling method, while the holes for the spliced ​​panels are drilled using a post-drilling method. C-shaped and I-shaped steel shell wall panel units are assembled and welded on different jigs. The straight section steel shell wall panel units are automatically welded using a reverse deformation jig-mounted robot. The curved section wall panels are welded on the jig using a back-assembly process with partitions, and semi-automatic welding is performed using solid wire gas shielded welding. Automated mechanical cold straightening is achieved using a CNC straightening machine, and flame straightening is used for some local deformations. Some welds on the inner wall panel units of the steel tower are first splatter welded to control deformation. S2: Welding and manufacturing of steel tower shell segments: The steel tower shell is continuously matched and manufactured on the assembly jig using adjacent steel tower shell segments. The steel tower shell segments are assembled using a horizontal assembly method. A marker tower is set outside the assembly jig to detect the positioning benchmark and the dimensions and alignment of the steel tower shell segments during assembly. S3: Welding and manufacturing of steel tower shell segments: The steel tower shell segments are assembled on an assembly jig using a three-dimensional assembly method. The positioning data of the steel tower shell blocks are measured, and the measured data is compared with the pre-assembly data simulated by the computer. After adjustment and positioning, a support plate is used for positioning. The vertical butt welds of the tower wall panels are welded by a welding robot. The steel tower shell segments are assembled on an assembly jig using a three-dimensional assembly method, and are designed with a special inner mold jig and support system. When positioning the steel tower blocks, the baseline of the laid-out jig is used as a reference. The theodolite is used for alignment and assembly. The measured data is compared with the pre-assembly data simulated by the computer. After adjustment and positioning, the support plate is used for positioning. The vertical butt welds of the tower wall panels are welded by a rail-type welding robot. The welds that cannot be welded by a robot are welded manually. S4: Welding and manufacturing of the overall assembly of the steel tower shell bridge site: When positioning the steel tower shell segments, the horizontal and vertical baselines of the installed previous steel tower shell segment and the baseline of the assembled jig are used as references for positioning; the steel tower shell segments are adjusted by guide blocks and temporary matching parts; multiple people and multiple points are used for simultaneous welding of the steel tower circumferential joints; When positioning steel tower shell segments, the horizontal and vertical baselines of the installed previous steel tower shell segment and the baseline of the laid jig are used as references. Theodolites and laser trackers are used for measurement and positioning. Guide blocks and temporary matching parts are set at the weld joints of the steel tower shell segments. The steel tower shell segments are adjusted by the guide blocks and temporary matching parts. After the assembly tolerance meets the design requirements, the temporary matching parts are locked and the positioning welding is carried out. When welding the circumferential seam of the steel tower, multiple people and multiple points are welded simultaneously. Multi-layer and multi-pass welding methods are used in the welding process, and the weld beads are reasonably arranged during the welding process.

2. The welding manufacturing method for the steel tower shell of a steel-concrete composite tower according to claim 1, characterized in that: To ensure the accuracy of the bridge connection between corresponding segments, a long-line assembly method is adopted on the assembly jig, where adjacent steel tower shell segments are continuously matched and pre-assembled simultaneously. A contour jig is made, and the steel tower shell segments are assembled using a horizontal assembly method. Independent baselines, base points, and measuring marker towers are set outside the assembly jig to continuously inspect the positioning references on the assembly jig and the dimensions and alignment of the steel tower shell segments during assembly. The welding sequence is adjusted based on the inspection results.

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