Welding manufacturing method for steel tower shell of steel shell concrete combined tower

Abstract

The invention relates to a welding manufacturing method for a steel tower shell of a steel shell concrete combined tower. The steel tower shell is composed of an inner wall plate, an outer wall plate, stiffening ribs, connecting angle steel and reinforcing steel bars. The wallboard units are welded by adopting different welding methods and deformation control methods; the steel tower shell block bodies are assembled by adopting a long-line method, the curve sections are made into profiling tires, and the steel tower shell section block bodies are assembled by adopting a horizontal assembling method; the sections of the steel tower shell are assembled through a three-dimensional assembling method, and the boundary dimensions of the sections are effectively controlled through a special inner mold jig frame and a supporting system. The sections of the steel tower are adjusted through the guide blocks and the temporary matching pieces, and the matching degree between the sections is improved; the assembling size, the line shape and the like are strictly controlled by comparing the assembling result with a computer simulation assembling result in the assembling process; according to the method, the welding deformation and the size precision of the wall plate units can be effectively controlled, the matching problem between blocks and sections of the steel tower shell can be effectively controlled, the technical problem in welding manufacturing of the steel tower shell can be solved, and the product size precision and the welding seam quality are improved.

Description

Technical Field

[0001] The present invention relates to the field of bridge steel structure manufacturing, and particularly to a welding manufacturing method for the steel tower shell of a steel-concrete composite tower. Background Art

[0002] As the span of cable-stayed bridges is getting larger and larger, the height of cable-stayed bridge towers is also constantly being refreshed. Both single steel towers and reinforced concrete towers have shown various drawbacks. The advantages of the construction method of steel-concrete composite towers are highlighted: compared with steel towers, under the condition of the same outer contour size, the compressive stiffness can be increased by 6 times, the steel consumption is only one-third of that of steel towers, and at the same time, the problem of fatigue cracking can be reduced, enhancing the durability of the bridge; compared with reinforced concrete towers, under the condition of the same cross-sectional size, the stiffness of the steel-concrete composite tower can be increased by 33%.

[0003] Chinese Patent 109290739 B: A manufacturing process for a spatial curve steel tower segment provides a manufacturing process for a spatial curve steel tower segment, which is applicable to the manufacturing of a single steel tower structure. Chinese Patent 110952448 A: A construction method for a steel-concrete composite cable tower provides a construction process for on-site casting of a hybrid tower, which is applicable to the on-site casting construction of a hybrid tower.

[0004] The above welding patents are not applicable to the welding manufacturing of the steel tower shell of a steel-concrete composite tower, and there are essential differences from this patent. The steel tower shell of a steel-concrete composite tower generally consists of an inner wall plate, an outer wall plate, stiffening ribs, connecting angle steels, steel bars, etc. The middle part of the inner wall plate is hollow, and most of them are irregular curve shapes. The inner wall plate is relatively thin, with dense horizontal and vertical stiffening ribs on the wall plate unit. It is difficult to control the deformation during the manufacturing process of the plate unit. The stiffness of the steel shell segment is small, and it is not easy to control the deformation during the assembly and welding process. There are problems such as poor matching between blocks and between segments. It is necessary to formulate a detailed welding manufacturing process to solve the above 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, which can effectively control the welding deformation and dimensional accuracy of the wall plate unit, can effectively control the matching problem between the steel tower shell blocks and segments, can solve the technical problems in the welding manufacturing of the steel tower shell, and improve the product dimensional accuracy and weld quality.

[0006] To solve the above 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, and its innovation lies in: specifically including the following steps: S1: Welding manufacturing of the wall plate unit of the steel tower shell: The bolt holes of the rib plates on the steel tower shell wall plate are drilled. The C-shaped block and the straight-shaped block steel shell wall plate units are assembled and welded 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 plate units. S2: Welding manufacturing of the steel tower shell segment blocks: Adjacent multi-segment continuous matching manufacturing of the steel tower shell is carried out on the assembly jig, and the horizontal assembly method is used to assemble the steel tower shell segment blocks; a marking tower is set outside the jig to detect the positioning reference and the dimensions and linearity during the assembly of the steel tower shell blocks. S3: Welding manufacturing of the assembly of the steel tower shell segments: The steel tower shell segments are assembled on the jig using the three-dimensional assembly method. The data for positioning the steel tower shell blocks are measured, and the measured data are compared with the data of the computer-simulated pre-assembly. After adjustment and positioning, the positioning is carried out using backing plates; the vertical butt welds of the tower wall plates are preferably welded by a welding robot. S4: Welding manufacturing of the overall assembly of the steel tower shell at the bridge site: When positioning the steel tower segments, the transverse and longitudinal baselines of the previously installed upper steel tower shell segment and the laid jig baselines are used as the reference for positioning; the tower segment is adjusted through guide blocks and temporary matching parts; when welding the steel tower circumferential seams, multiple people weld at multiple positions simultaneously.

[0007] Furthermore, the bolt holes of the rib plates on the steel tower shell wall plate are drilled using the pre-drilling method, and the splicing plates are drilled using the post-drilling method; the C-shaped block and the straight-shaped block steel shell wall plate units are assembled and welded on different jigs; the straight-section steel shell wall plate units are welded by an automatic welding robot in the reverse deformation position of the ship jig; the curved-section wall plates are welded on the jig with a back assembly process partition, and are welded semi-automatically using a solid wire gas shielded welding; an NC correction machine tool is used to achieve automated mechanical cold correction, and part of the local deformation is corrected by flame correction; some welds of the steel tower inner wall plate units are initially welded to control deformation.

[0008] Furthermore, to ensure the connection accuracy of the corresponding sub-blocks between segments at the bridge site, the long-line method of simultaneous adjacent multi-segment block continuous matching manufacturing and pre-assembly of the steel tower shell is carried out on the assembly jig; a profiling jig is made, and the horizontal assembly method is used to assemble the steel tower shell segment blocks; independent baselines, base points, and measuring marking towers are set outside the jig to detect the positioning reference on the jig and the dimensions and linearity during the assembly of the steel tower column at any time; the welding sequence is adjusted according to the detection results.

[0009] Furthermore, the steel tower shell segments are assembled on the assembly jig using the three-dimensional assembly method, and a special internal mold jig and support system are designed. When positioning the steel tower blocks, the laid jig baseline is used as the reference, and a theodolite is used for alignment assembly. The actual measured data is compared with the data of the computer-simulated pre-assembly, and after adjustment and positioning, a backing plate is used for positioning. The vertical butt welds of the tower wall plates are preferably welded by a MICROBO orbital welding robot, and some welds that cannot be welded by the robot can be welded manually.

[0010] Furthermore, when positioning the steel tower segments, the transverse and longitudinal baselines of the previously installed steel tower shell segment and the laid jig baseline are used as the reference, and a theodolite and a laser tracker are used for measurement and positioning. Guide blocks and temporary matching parts are provided at the circumferential welds of the steel tower segments. The tower segments are adjusted through the guide blocks and temporary matching parts. After the assembly allowable deviation meets the design requirements, the temporary matching parts are locked for positioning welding. When welding the steel tower circumferential welds, multiple people weld at multiple positions simultaneously. During the welding process, the multi-layer and multi-pass welding method is used, and the weld beads are reasonably arranged during the welding process.

[0011] The advantages of the present invention are as follows: 1) In the present invention, the bolt holes of the plate ribs are punched by the pre-hole method, and the splicing plates are punched by the post-hole method; different welding methods are used for welding the steel shell wall plate units of the C-shaped blocks and the I-shaped blocks. Different deformation control methods are used during the welding process, and different straightening methods are used for straightening after welding. For the relatively thin inner wall plates, partial welds are skipped to control the welding deformation.

[0012] 2) The steel tower shell blocks are assembled by the long-line method, which can effectively ensure the longitudinal matching relationship between the blocks; a profiling jig is made, and the steel tower shell segment blocks are assembled by the horizontal assembly method. By setting independent baselines, base points, and measurement marker towers outside the jig, the dimensions and linearity during assembly can be effectively controlled.

[0013] 3) The steel tower shell segments are assembled by the three-dimensional assembly method. Through the special internal mold jig and support system, the external dimensions of the segments can be effectively controlled; the vertical butt welds of the wall plates are preferably welded by a MICROBO orbital welding robot, and the welding quality of the welds is high and stable.

[0014] 4) Guide blocks and temporary matching parts are provided at the circumferential welds of the steel tower segments. The steel tower shell segments are adjusted through the guide blocks and temporary matching parts to improve the matching degree between the segments; when welding the steel tower circumferential welds, multiple people weld at multiple positions simultaneously, reducing the internal stress of the circumferential welds and improving the weld quality. Description of the Drawings

[0015] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0016] Figure 1 It is a schematic diagram of the block division of the steel tower shell segment described in the present invention.

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

[0018] Figure 3 is the layout drawing of the wall panel unit of the steel tower shell described in the present invention.

[0019] Figure 4 is the schematic diagram of the welding sequence of the straight section wall panel unit described in the present invention.

[0020] Figure 5 is the schematic diagram of the process partition board of the curved section wall panel unit described in the present invention.

[0021] Figure 6 is the schematic diagram of the welding sequence of the curved section wall panel unit described in the present invention.

[0022] Figure 7 is the schematic diagram of comparing the surveying and mapping data with the digital 3D model of the design described in the present invention.

[0023] Figure 8 is the schematic diagram of the skip welding during the welding of the inner wall panel unit of the steel tower shell described in the present invention.

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

[0025] Figure 10 is the schematic diagram of the horizontal assembly jig for the steel tower shell block described in the present invention.

[0026] Figure 11 is the schematic diagram of the profiling jig described in the present invention.

[0027] Figure 12 is the schematic diagram of the continuous matching assembly manufacturing of multiple sections of the steel tower shell block described in the present invention.

[0028] Figure 13 is the schematic diagram of the layout of the measurement base stations for the vertical assembly of the steel tower shell sections described in the present invention.

[0029] Figure 14 is the schematic diagram of the special jig and support system for the assembly of the steel tower shell sections described in the present invention.

[0030] Figure 15 is the schematic diagram of the layout of the temporary matching parts and guiding blocks of the steel tower shell.

[0031] Figure 16 is the schematic diagram of multi-person segmented welding between the steel tower shell sections described in the present invention. Detailed implementation manners

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

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] As Figure 1 To Figure 16 shown: The steel tower shell is divided into segment blocks, and the schematic diagram of the segment division of the steel tower shell is shown in Figure 1 wherein the steel tower shell is divided into different segments according to the needs of manufacturing and installation. The bulkheads between the segments are welded, and the longitudinal stiffeners are bolted; the segments are composed of blocks, and the blocks are divided into C-shaped blocks and one-shaped blocks according to the structural form; the blocks are composed of bulkhead units, angle steels, and connecting stiffeners; the bulkhead units are composed of bulkheads and transverse and longitudinal stiffeners. The stiffeners are PBL plates with steel bar holes, which are divided into inner bulkhead units and outer bulkhead units according to their positions, and are divided into straight-section plate units and curved-section plate units according to the structural form.

[0035] A welding manufacturing method for the steel tower shell of a steel-concrete composite tower, wherein the manufacturing of the steel tower shell is divided into four steps as shown in Figure 2 , S1: Welding manufacturing of the bulkhead units of the steel tower shell; S2: Welding manufacturing of the blocks of the steel tower shell; S3: Welding manufacturing of the segment assembly of the steel tower shell; S4: Welding manufacturing of the overall assembly of the steel tower shell at the bridge site.

[0036] S1: Since the tower segment has an ultra-large cross-section and many connecting hole groups, the post-hole method cannot use numerical control equipment. To ensure the hole group accuracy of the longitudinal ribs of the tower segment and reduce or avoid the influence of human factors on the drilling process; the plate ribs adopt the pre-hole method and are drilled using a covering mechanical template, with shrinkage allowances reserved for the hole groups at both ends; this solution can make the extreme edge hole distances of the plate ribs synchronous and reduce the types of splicing plates; the holes of the splicing plates are measured after the pre-assembly of the tower segment blocks, the hole distances of adjacent segments are measured, the bolt hole positions of the splicing plates are determined, and the numerical control drill is used to drill the splicing plate holes according to the data.

[0037] Assemble the steel shell bulkhead units on a special jig, and first draw the transverse and longitudinal baselines as shown in Figure 3, strictly control the verticality of the horizontal and vertical baselines, the vertical baseline is used as the basis for the alignment of the vertical stiffening ribs, and the horizontal baseline is used as the basis for controlling the concentricity of the holes of the ribs with holes in the same cross-section. When assembling the plate ribs, a magnetic line positioning regulator is used for horseless assembly, focusing on controlling the spacing of the stiffening ribs at the two ends and the partition position. Plate rib welding can only be carried out after passing the inspection.

[0038] The straight section steel shell panel unit is welded by anti-deformation tire position robot automatic welding. Figure 4 ; Fix the plate unit on the anti-deformation tire, preset the anti-deformation of welding, reduce the amount of post-welding trimming, and tilt the tire shape by about 38°; Use welding robots to cooperate with anti-deformation welding, and use barreled T492T1-0C1A (Φ1.4mm) flux-cored welding wire. Use arc tracking technology to reduce welding deformation, and control the loosening temperature after welding to ensure welding quality. When welding, weld symmetrically from the middle of the width direction of the plate unit to both sides. After welding one side of the weld, turn the tire frame over, and weld the other side of the fillet weld in the same order. All welds are welded in the same direction. After trimming the plate unit, assemble the horizontal stiffening ribs, weld the fillet welds between the horizontal stiffening ribs and the wall panels and vertical stiffening ribs, and weld symmetrically from the middle of the plate unit to both sides.

[0039] Before assembling the curved section wall panel unit, check the curvature of the wall panel. Only when it meets the requirements can the assembly welding work be carried out; set a process partition on the non-rib side of the wall panel, and place the wall panel with the process partition on the contour tire to make the wall panel fit closely with the tire frame rib plate to prevent the wall panel from deforming when welding the rib plate. Figure 5 ; Use gas shielded semi-automatic welding, G49A3C1S6 (Φ1.2mm) solid welding wire to weld the fillet weld between the stiffening rib and the wall plate. See the welding sequence diagram for details. Figure 6 , the vertical stiffening ribs should be welded first, and then the horizontal stiffening ribs, and the welding should be carried out symmetrically from the middle of the plate unit to both sides, and the same type of welds should be welded in the same direction; the vertical angle welds between the vertical stiffening ribs and the horizontal stiffening ribs should be welded. The process partition is retained until the steel tower shell block is welded and removed.

[0040] Bending and torsion plate unit welding inspection, see Figure 7 : After the bending and torsion plate unit is welded, the data of the surface feature points on the steel plate is collected by a laser tracker and entered into the system. The software is used to simulate the shape and compare it with the designed digital three-dimensional model, and then the bending and torsion of the steel plate is corrected. At the same time, an adjustable arc detection special sample is used for detection to ensure that the steel plate is twisted evenly.

[0041] There is still a certain degree of deformation in the plate units after welding. A numerically controlled correction machine tool is used to achieve automated mechanical cold correction. This machine tool can intelligently sense the flatness through image recognition, and the flatness of the plate unit after correction can reach within 1 mm. For some curved plate units and local deformations, flame correction is adopted. The heat correction temperature should be controlled within 600 - 800 °C, and overheating is strictly prohibited. After correction, the temperature of the part should be slowly cooled, and the steel should not be hammered or quenched with water before it cools down to room temperature. The heating methods of the heating correction method can be divided into spot heating, linear heating, and triangular heating.

[0042] For the deformation control of the inner wall plate units of the steel tower shell, see Figure 8 ; In order to better control the welding deformation of the thin plate units, during the welding of the plate units, some welds are first skipped, and after the assembled block is formed and the rigidity of the entire plate unit increases, the welding is carried out. Specifically as follows: During welding, first weld the welds between the vertical ribs and the wall plates, then weld one side of the welds between the horizontal ribs and the vertical ribs, weld the welds between the horizontal ribs and the wall plates, and weld the other side of the welds between the horizontal ribs and the vertical ribs after the welding of the angle steel of the block and the horizontal and vertical ribs is completed.

[0043] S2: On the assembly platform, with the transverse and longitudinal baselines as the reference, the plate units are "assembled in pairs of two", and key control is exerted on the distance between the transverse and longitudinal baselines and the setting of the anti-deformation for the two-piece assembly, see Figure 9 , reduce the welding deformation, measure the hole distances of adjacent segments, and ensure the synchronization of the holes of the reference head plate ribs.

[0044] The steel tower shell segment blocks are assembled by the horizontal assembly method. Independent baselines, base points, and measurement marker towers are set outside the jig, see Figure 10 , and the positioning reference on the jig and the dimensions and linear shapes during the assembly of the steel tower column are detected at any time and adjusted according to the detection results. Sufficient stoppers are set at the contact parts between the blocks and the platform and fixed on the horizontal plane. The jig is provided with elevation adjustment members for adjusting the linear change of each block.

[0045] Preferably, a profiling jig is made for the curve segment blocks. The adjustable profiling jig is composed of transverse ribs and longitudinal ribs, see Figure 11 . The transverse ribs are set at the press-bending lines and both ends of the plate unit. The elevation values of the upper surfaces at both ends of each transverse rib are calculated through the corresponding coordinate data in the construction drawings. The adjustable profiling jig composed of transverse ribs realizes the bending and torsion shape at the bottom of the main board of the plate unit; to maintain the stability of the jig shape, longitudinal ribs can be set for connection and stiffening. According to the finite element principle, as long as the wall plate is in close contact with the rib plates of the jig, the correctness of the wall plate shape can be confirmed. The transverse ribs can be adjusted according to the coordinates and reused for the jig of the plate units with other coordinates after disassembly.

[0046] To ensure the connection accuracy of the corresponding segments between adjacent bridge positions, the "long-line method" assembly is adopted on the assembly jig, in which the continuous matching manufacturing and pre-assembly of multiple segment blocks of adjacent steel tower shells are completed simultaneously, see Figure 12First, the steel tower plate units and components are horizontally and continuously manufactured in a matching manner on the assembly jig. Every 4 segments are assembled in one round. After the previous round of pre-assembly is completed, one block is left to participate in the next pre-assembly. Both the C-shaped blocks and the straight-shaped blocks are continuously and match-assembled in the order from bottom to top. After passing the inspection, the first three segments are disassembled from the jig and used for the assembly and welding of the steel tower shell segments.

[0047] Based on the transverse and longitudinal baselines of the jig, the outer wall plate units of the blocks are positioned in sequence. During the segment assembly, the assembly is based on the reference end. For those with an increment in the width direction, the assembly is based on the bevel edge. For those without an increment, the positioning is based on the reference edge and reference head of the outer wall plate unit. Before positioning, the ground lines are marked under the platform. Assemble the inner wall plate units, temporary process supports, angle steels, and steel bars. First, complete the welding of the angle steels with the horizontal ribs and vertical ribs, and then complete the welding of the remaining parts of the vertical ribs and horizontal ribs. After the block-by-block welding is completed, mark and cut the process allowances.

[0048] S3: To ensure the installation quality at the bridge site, the steel tower shell segments are assembled using the three-dimensional assembly method and assembled into the designed segments on the overall assembly platform system. By deploying a three-dimensional measurement control network in the steel tower assembly area, see Figure 13 , measure the three-dimensional coordinates of the monitoring points during the three-dimensional assembly process of the steel tower shell segments and conduct data analysis. Compare with the data of the computer-simulated pre-assembly, and use the backing plates for positioning after adjustment. The vertical butt welds of the tower wall plates are preferably welded using a MICROBO orbital welding robot. For the part of the weld that cannot be welded by the robot, manual welding can be used, and the welding wire used is the flux-cored wire T492T1-1C1A (Φ1.2mm).

[0049] Preferably, design a special jig and support system, see Figure 14 , draw a cross centerline on the overall assembly platform as the positioning reference between the blocks. The support system is arranged at the internal empty positions of the segments. The acting points of the support system can be adjusted in depth to adapt to the changes in the external dimensions of different segments. At the same time, it plays a role in strengthening the ports to ensure the dimensional accuracy. The blocks are hoisted in place and accurately positioned, and fixed through the internal support system.

[0050] Preferably, set up a level control network (benchmark points), a plane linear control network (ground line), and a Leica laser tracking measurement system inspection station outside the jig that are not affected by other factors; position according to the transverse and longitudinal ground lines of the three-dimensional pre-assembly measurement and control network, the positioning system lines and measuring points of the steel tower segments, and use a theodolite and a Leica laser tracking measurement system to measure and control the perpendicularity of the four-sided system lines of the steel tower shell, the overall assembly dimensions of the steel tower segments, the cross-sectional elevation of the steel tower segments, etc. After calculation and processing, obtain the actual axis graphics and data of the components, and realize the detection of the height, perpendicularity, steel bar centering rate, and segment bending of the steel tower shell; compare the measured data with the data of the computer-simulated pre-assembly, and use the backing plates for positioning after adjusting the special jig and support system in place.

[0051] Preferably, the vertical butt welds of the tower wall plates are preferably welded by a MICROBO orbital welding robot, which realizes the precise positioning of the welds, realizes automatic welding, automatically obtains workpiece information, and automatically generates welding programs. This ensures stable weld quality and beautiful weld formation. The partial welds that cannot be welded by the robot can be welded manually.

[0052] S4: Based on the installed transverse and longitudinal baselines of the steel tower shell segments, use a laser tracker to measure and position the next steel tower shell segment to be installed in sequence, and compare and adjust it with the results of computer simulation assembly. Key points to control include the overall external dimensions, verticality, misalignment of plate units between segments, cross-sectional elevation, etc. of the steel tower shell. After the allowable deviations meet the design requirements, after the steel tower block is positioned, it is fixed with temporary matching parts and process plates, and the lower end face and its groove are protected with tooling. After passing the inspection, the welding lugs are positioned and the circumferential welds are welded.

[0053] Preferably, the steel tower shell segments are provided with guide blocks and temporary matching parts, as shown in Figure 15 , distinct elevation measuring points and plane measuring points are set on the top surfaces of the matching parts, which are used as control points for the positioning measurement of the tower segments at the bridge site. The guide blocks and temporary matching parts are arranged inside the box body, which is beneficial to the coating and base material protection of the outer wall plates at the circumferential weld positions of the steel tower shell. At the same time, the end faces of the temporary matching parts connected to the bottom side segments of the tower extend beyond the end faces of the tower segments. The designed structure-matching tooling protects the bottom end face and its groove of the steel tower shell well during the transportation and shipping of the segments to avoid damage. The guide blocks can well position the steel tower shell segments, and after positioning, the temporary matching parts are fastened with bolts.

[0054] Preferably, control the circumferential weld welding sequence, as shown in Figure 16 , first weld the butt welds of the inner wall plates, then weld the butt welds of the outer wall plates. During welding, the principles of symmetric welding and multi-person segmented welding should be followed, and then the longitudinal stiffeners are bolted.

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

[0056] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A welding method for manufacturing a steel shell of a steel shell concrete composite tower, characterized in that: The specific steps include: S1: Welding and manufacturing of steel tower shell plate units: The bolt holes of the steel tower shell wall plate ribs are drilled out, and C-shaped blocks and I-shaped blocks of steel shell wall plate units are welded on different frames. Different welding methods and welding equipment are used during welding to control and correct the welding deformation of the steel shell wall plate units; S2: Welding and manufacturing of steel tower shell segments: The adjacent steel tower shell segments are continuously matched and manufactured on the assembly frame, and the steel tower shell segment blocks are assembled using the horizontal assembly method; a marker tower is set outside the frame to detect the positioning benchmark and the size and line shape of the steel tower shell blocks during assembly; S3: Welding and manufacturing of steel tower shell segment assembly: The steel tower shell segments are assembled on the tire using the three-dimensional assembly method. The data of the positioning of the steel tower shell blocks are measured, and the measured data are compared with the data of the pre-assembly simulated by the computer. After adjustment, the horse plate is used for positioning; the vertical butt welds of the tower wall panels are preferably welded by welding robots; S4: Welding and manufacturing of the overall assembly of the steel tower shell bridge: When positioning the steel tower segment, the horizontal and vertical baselines of the installed previous steel tower shell segment and the baseline of the laid tire frame are used as the reference for positioning; the tower segment is adjusted through guide blocks and temporary matching parts; when welding the steel tower circumferential seam, multiple people and multiple points are used for simultaneous welding.

2. The welding manufacturing method of a steel shell concrete composite tower according to claim 1 is characterized in that: The bolt-jointing holes of the steel tower shell wall panel ribs are made by the first-hole method, and the holes of the splicing plates are made by the later-hole method; the C-shaped blocks and the I-shaped blocks of the steel shell wall panel units are welded on different frames; the straight section steel shell wall panel units are welded by automatic welding with anti-deformation tire position robots; the curved section wall panels are welded on the tire frame using the back assembly process partition and semi-automatic welding with solid welding wire gas shielded welding; CNC correction machine tools are used to achieve automated mechanical cold correction, and flame correction is used for some local deformations; some welds of the steel tower inner wall panel units are first welded to control deformation.

3. The welding manufacturing method of a steel shell concrete composite tower according to claim 1 is characterized in that: In order to ensure the accuracy of the bridge connection of the corresponding blocks between the segments, the long-line assembly method is adopted on the assembly frame to continuously match and manufacture the adjacent steel tower shell multi-segment blocks and complete the pre-assembly at the same time; a contoured frame is made, and the steel tower shell segment blocks are assembled by the horizontal assembly method; independent baselines, base points, and measurement marker towers are set outside the frame to check the positioning reference on the frame and the size and line shape of the steel tower column during assembly at any time; the welding sequence is adjusted according to the test results.

4. The welding manufacturing method of a steel shell concrete composite tower according to claim 1 is characterized in that: The steel tower shell segments are assembled on the assembly tire using the three-dimensional assembly method, and are designed with a special inner mold tire frame and support system; When positioning the steel tower block, the laid-out frame baseline is used as the reference, and the theodolite is used for alignment assembly. The measured data is compared with the computer simulated pre-assembly data, and the horse plate is used for positioning after adjustment. The vertical butt welds of the tower wall panels are preferentially welded with MICROBO orbital welding robots, and some welds that cannot be welded by robots can be welded manually.

5. The welding manufacturing method of a steel shell concrete composite tower according to claim 1 is characterized in that: When positioning the steel tower segment, the horizontal and vertical baselines of the installed previous steel tower shell segment and the baseline of the laid frame are used as the reference, and the theodolite and laser tracker are used for measurement and positioning; guide blocks and temporary matching parts are provided at the circumferential weld of the steel tower segment, and the tower segment is adjusted by means of guide blocks and temporary matching parts. After the allowable deviation of the assembly 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 used for simultaneous welding, and the multi-layer and multi-pass welding method is used during the welding process, and the welds are arranged reasonably during the welding process.

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