Construction technology of four-corner square vase type conversion structure

Abstract

The invention belongs to the technical field of building steel structures, and discloses a construction process of a four-corner square steem type conversion structure, which comprises the following steps: step 1, manufacturing a bottom plate of the conversion structure, step 2, manufacturing corner brackets at four corners, step 3, manufacturing Y-shaped bent brackets at four side surfaces, and installing and welding a web plate at the outer side of the lower part, wherein a web plate on the outer side of the lower portion of one Y-shaped bending and twisting bracket is postponed to be assembled, and installation and welding are conducted during follow-up overall assembly; 4, a trapezoidal upper ring beam box body is manufactured; and 5, the four-corner square steem type conversion structure is integrally assembled. According to the method, firstly, the supporting point positions of the corner brackets at the four corners are assembled and welded, then, the Y-shaped bent brackets on the left sides of the corner brackets are assembled and welded, and finally, the Y-shaped bent brackets on the right sides of the corner brackets are assembled and welded, so that the precision of on-site butt joint ports of the brackets of the conversion structure is guaranteed. By formulating reasonable and targeted assembling steps, the problem that parts cannot be welded is solved, meanwhile, deformation is effectively controlled, and the welding quality is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of building steel structures, and specifically relates to a construction process for a four-corner square urn type conversion structure. Background Art

[0002] Shanghai East Railway Station, an eastern hub, is a mega-project serving national strategies and Shanghai's long-term development. Designed with the theme "Magnolia of Light, Rising East," the station building integrates the shape of the white magnolia, Shanghai's city flower, in its architecture, structure, and decoration. As part of the eastern hub, Shanghai East Railway Station features the following steel structure distribution in the main building area: the basement is a rigid steel column reinforced concrete frame structure; the track-bearing and waiting decks are rigid steel columns and prestressed concrete; the roof is a spatial truss grid steel structure; the commercial mezzanine is a steel frame system; the exterior facade features a steel curtain wall structure; and the throat and canopy areas utilize a steel frame system. A four-cornered square-shaped transfer structure serves as the transfer support column connecting the first-floor track-bearing and waiting deck corridors. The complex component node types, diverse bend curvatures, and unique spatial shapes contribute to the station's unique shape.

[0003] The total cross-sectional dimensions of the four-corner square-shaped conversion structure are: 3000*3000mm at the bottom, 6000mm*6000mm at the top, 3600mm in height, and weigh approximately 30 tons. The four-corner square-shaped conversion structure is welded together by a base plate, a lower ring beam, four corner brackets, eight Y-shaped bending and twisting brackets on the four sides, four corner supports, an upper ring beam, and four diagonal braces on the upper ring beam. This conversion structure has a large number of welds at the nodes, thin plates, a relatively complex Y-shaped bending and twisting bracket structure on the sides, and full penetration welds on the structure itself. The component plates are irregularly distributed, and assembly and welding are primarily done by de-assembly and de-welding, which requires a large amount of welding space. Ensuring welding quality and controlling deformation are challenging issues.

[0004] Related reference document CN108581259A discloses a method for manufacturing a special-shaped complex W-shaped box-shaped column. Box-shaped brackets and H-shaped brackets are respectively provided on both sides of the middle web at one end of the W-shaped body. The box-shaped bracket is located on the outside of the H-shaped bracket. The two box-shaped brackets are arranged at a certain angle. When welding the two H-shaped brackets to the W-shaped body, after the main weld is completed and tested, the lower flange plate of the H-shaped bracket is assembled and positioned; the T rows on both sides of the middle of the H-shaped bracket are assembled and positioned, and the T rows are welded to the middle web. , the weld of the lower flange plate of the H-shaped corbel; assemble and position the upper flange plate of the H-shaped corbel, weld the welds between the upper flange plate of the H-shaped corbel and the T row, as well as the welds between the upper and lower flange plates of the H-shaped corbel and the wing web of the W-shaped body; after the previous step of production and inspection is qualified, assemble and position the H-shaped corbel and the sealing plate of the W-shaped body, and enter the next assembly process after passing the inspection; assemble the web of the H-shaped corbel, and weld the welds between the web and the H-shaped flange plate; however, the docking port accuracy is low when welding the corner corbel and the Y-shaped bending and torsion corbel. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a construction process for a four-corner square-shaped conversion structure that solves the problem of limited assembly and welding space, effectively controls welding deformation, ensures welding quality, and ensures the accuracy of each bracket docking port.

[0006] In order to solve the above technical problems, the present invention provides a construction process for a four-corner square urn type conversion structure, comprising the following steps: Step 1: Make the base of the conversion structure Step 2: Make the four corner corbels The corresponding diaphragm of the support and the corresponding diaphragm of the lower ring beam are welded between the inner and outer webs of the corner corbel; the side flange plate I and side flange plate II are welded on both sides of the inner and outer webs respectively; the corresponding diaphragm of the support and the side flange plate I are welded and fixed, and the corresponding diaphragm of the lower ring beam and the side flange plate II are welded and fixed; the side flange plates I and II are welded and fixed; the upper end sealing plate is welded; Step 3: Make the four-sided Y-shaped twisted bracket S1. The outer flange plate of the Y-shaped bending and twisting bracket is placed on the tire frame. The bifurcated web plates and small flange plates on both sides of the U-shaped bifurcation at the bifurcation of the Y-shaped bracket are welded and assembled on the outer flange plate. Ceramic pads are attached to the outer side of the welding groove. Two Y-shaped bending and twisting brackets on the same side are assembled and manufactured on the same tire frame at the same time. S2. Assemble and weld the V-shaped bifurcated inner web, inner flange plate, bifurcated node plate, and corresponding diaphragm of the upper ring beam of the Y-shaped bending and torsion bracket; The inner web of the V-shaped fork is welded to the outer flange plate and the inner flange plate. The upper ring beam corresponding to the diaphragm and the bifurcation node plate are welded to the inner web of the V-shaped fork. The upper ring beam corresponding to the diaphragm, the bifurcation node plate, the outer flange plate and the inner flange plate are welded to the diaphragm; S3. Welding the internal vertical partition One side of the vertical partition is welded to the small flange plate, and the other side opposite to it is welded to the inner flange plate; S4, welding the upper outer web First, weld the upper outer web I to the outer flange plate and the inner flange plate, and weld and fix the upper outer web I to the corresponding diaphragm of the upper ring beam; then weld the upper outer web II to the outer flange plate and the inner flange plate, and weld and fix the upper outer web II to the node plate at the bifurcation position; S5, welding the lower outer web The lower outer web is welded to the outer flange and inner flange. The lower outer web of one of the Y-shaped torsion brackets is temporarily suspended from assembly. Step 4: Make a trapezoidal upper ring beam box Step 5: Assemble the four-corner square statue conversion structure S1. Assemble the base plate and corner brackets; place the base plate on a horizontal reference surface and weld the four corner brackets; S2. Assemble the outer web and corner diaphragms of the lower ring beam; weld the outer web and corner diaphragms of the lower ring beam to the bottom plate; S3. Assemble the upper flange plate of the lower ring beam, the middle partition plate, and the inner web plate of the lower ring beam; S4. Assemble the Y-shaped bending and twisting brackets on one side of each corner bracket; S5. Assemble the Y-shaped bending and twisting bracket on the other side of each corner bracket; weld the lower outer web remaining due to the temporary suspension of welding at the web section G on the rear cover of the Y-shaped bending and twisting bracket; S6. Assemble the corner support; the corner support is welded to the inner web of the corner corbel; S7. Assemble the upper ring beam; weld and fix the upper ring beam, corner supports, and Y-shaped bending and torsion brackets.

[0007] By adopting the above technical solution, based on the characteristics of the conversion structure, the support points of the corner brackets at the four corners are first welded, followed by the assembly and welding of the Y-shaped bent and twisted brackets in the diagonal direction on the left side of each corner bracket, and finally the assembly and welding of the Y-shaped bent and twisted brackets in the diagonal direction on the right side of each corner bracket. This production solution ensures the accuracy of the on-site docking ports of each bracket of the conversion structure. The lower outer web of one of the Y-shaped bent and twisted brackets on each side is welded during the overall assembly, and the solution of installing the local main body plate later solves the problem of limited assembly and welding space. By formulating reasonable and targeted assembly steps, the problem of parts being unable to be welded is solved, while deformation is effectively controlled and welding quality is guaranteed.

[0008] Preferably, step four is to make a trapezoidal upper ring beam box: S1. Assemble the upper flange plate, outer sloping web plate, and upper ring beam diaphragm; weld the long sides of the upper flange plate and outer sloping web plate together, and weld the upper ring beam diaphragm between the upper flange plate and outer sloping web plate; weld the long sides of the upper ring beam diaphragm to the upper flange plate, and weld the sloping sides to the outer sloping web plate; S2. Assemble the lower flange plate and the inner web of the upper ring beam; weld the lower flange plate to the upper ring beam diaphragm, and weld the long side of the lower flange plate to the outer inclined web; weld the inner web of the upper ring beam to the outer side of the upper ring beam diaphragm; S3. Overall assembly of the upper ring beam box The upper flange plates, the lower flange plates, the outer inclined web plates, and the inner web plates of the upper ring beam are butt-welded to form a square upper ring beam; diagonal braces are welded at the four corners inside the upper ring beam.

[0009] By adopting this technical solution, the upper ring beam bulkhead is welded to the upper flange plate, and the beveled edge is welded to the outer diagonal web plate, forming a triangular stabilizing unit. This improves the torsional rigidity of the upper flange plate and the outer diagonal web plate. The diagonal braces at the four corners of the upper ring beam, along with the upper and lower flange plates and the inner and outer web plates, form a spatial truss, effectively distributing concentrated loads and improving the load-bearing capacity of the transfer structure while saving steel. This achieves a perfect balance of function, efficiency, and aesthetics.

[0010] Preferably, in step five, S3, assemble the upper flange plate of the lower ring beam, the middle position partition, and the inner web of the lower ring beam: weld the upper flange plate of the lower ring beam on the outer web of the lower ring beam and the corner partition, remove the middle position partition, and finally weld the inner web of the lower ring beam; weld the upper flange plates of the lower ring beams in pairs to form a square lower ring beam.

[0011] By adopting the above technical solution, the outer web of the lower ring beam, the upper flange plate of the lower ring beam, the middle partition, and the inner web of the lower ring beam form a space frame. The middle partition increases stress balance, optimizes the distribution of steel materials, ensures the bearing capacity, and effectively saves materials.

[0012] Preferably, in step five, S4, assemble the Y-shaped bent and twisted corbels on one side of each corner corbel: the Y-shaped bent and twisted corbels are welded to the lower ring beam, the inner flange plate and the edge of the lower ring beam upper flange plate of the lower ring beam are welded, and the lower outer web plate and the inner web plate of the lower ring beam and the lower ring beam upper flange plate are welded; the bottom end of the outer flange is welded to the bottom plate.

[0013] By adopting the above technical solution, a Y-shaped bending and torsion bracket is installed on one side of each corner bracket to transfer the force and improve the overall bearing capacity of the conversion structure.

[0014] Preferably, in step five, S5, the Y-shaped bent and twisted corbels on the other side of each corner corbel are assembled: the Y-shaped bent and twisted corbels are welded to the lower ring beam; the inner flange plate and the edge of the lower ring beam upper flange plate are welded, and the outer lower outer web plate and the inner web plate of the lower ring beam and the lower ring beam upper flange plate are welded; the bottom end of the outer flange plate is welded to the bottom plate; the inner lower outer web plate remaining due to the temporary suspension of assembly is welded to the inner flange plate, the inner web plate of the lower ring beam, and the lower ring beam upper flange plate.

[0015] By adopting the above technical solution, the Y-shaped bending and torsion corbels on both sides of each corner corbel, together with the lower ring beam, upper ring beam and corner corbels, form a blooming four-corner square-shaped conversion node, which can be used for the conversion of different steel columns and roof truss spatial structures. It has the advantages of large force, reasonable force transmission, stable structure, novel shape, and saving steel.

[0016] Preferably, in step five, the four-corner square-shaped conversion structure is assembled as a whole. In S7, the weld between the inner flange plate of the Y-shaped bending and torsion bracket and the outer inclined web of the upper ring beam is required to be a one-circle fillet weld with a weld angle of 14 mm.

[0017] By adopting the above technical solution, the 14mm fillet weld is continuously arranged along the perimeter of the joint to form a 360° closed weld, forming a closed force transmission path, improving the structural integrity and enhancing the bearing capacity of the conversion structure.

[0018] The four-corner square-shaped conversion structure is manufactured using the construction technology of the four-corner square-shaped conversion structure, including a base plate, corner corbels installed at the four corners of the base plate, Y-shaped bending and twisting corbels are arranged on both sides of the corner corbels, the Y-shaped bending and twisting corbels are fixed on the lower ring beam, and the lower ring beam is arranged on the base plate; the inner flange plate of the corner support is arranged on the top of the corner corbel for fixed connection.

[0019] By adopting the above technical solution, the tetrahedron structure has a stronger bearing capacity than the cube and can effectively disperse the load.

[0020] Preferably, diagonal braces are fixedly provided at the four corners of the upper ring beam.

[0021] By adopting the above technical solution, diagonal braces are installed around the upper ring beam to improve the overall stability of the upper ring beam in transmitting force.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. According to the characteristics of the conversion structure, the present invention first performs assembly welding of the support points of the corner brackets at the four corners, then performs assembly welding of the Y-shaped bent and twisted brackets in the diagonal direction on the left side of each corner bracket, and finally performs assembly welding of the Y-shaped bent and twisted brackets in the diagonal direction on the right side of each corner bracket. This production scheme ensures the accuracy of the on-site docking ports of each bracket of the conversion structure. The lower outer web of one of the Y-shaped bent and twisted brackets on each side is welded when the whole is assembled, and the solution of installing the local main body plate later is adopted to solve the problem of limited assembly and welding space. By formulating reasonable and targeted assembly steps, the problem of parts being unable to be welded is solved, and at the same time, deformation is effectively controlled to ensure welding quality.

[0023] 2. The structure of the Y-shaped bending and twisting corbel of the present invention is relatively complex. During production, the outer flange plate of the Y-shaped bending and twisting corbel is placed on the tire frame, and the bifurcated webs and small flange plates on both sides of the U-shaped bifurcation of the bifurcation of the Y-shaped corbel are welded and assembled on the outer flange plate. The two Y-shaped bending and twisting corbels on the same side are assembled and produced on the same tire frame at the same time; the V-shaped bifurcation inner web, inner flange plate, bifurcation node plate, and upper ring beam corresponding partition of the Y-shaped bending and twisting corbel are welded; the internal vertical partition is welded; the upper outer web is welded; the lower outer web is welded, and the lower outer web of one of the Y-shaped bending and twisting corbels is temporarily assembled. The outer structure is completed first, and then the internal partition is welded, and finally the outer web is closed to form an outside-inside-outside welding sequence, so that the welding stress is gradually released, the welding deformation is controlled, and the welding quality is ensured. In addition, the lower outer web of one of the Y-shaped bending and twisting corbels is welded when the whole is assembled, and the solution of installing the local body plate later is adopted to solve the problem of limited assembly and welding space.

[0024] 3. The conversion structure of the present invention has a large number of welds, the plate thickness is relatively thin, and there is a variable-section oblique partition inside the upper ring beam box, and the upper ring beam welds are required to be fully penetrated. The parts plate is irregularly divided, and the welding is mainly done by de-installation and de-welding, which requires a large amount of welding space. According to the characteristics of the conversion structure, the upper and lower ring beams are made separately, the corner brackets are made separately, the side Y-shaped bending and twisting brackets are made separately, and then merged and docked together, and finally welded into a four-corner square statue-style conversion structure. This solution reasonably solves the problem that the partitions inside the box cannot be welded, and also ensures the quality of the partition welds. By formulating reasonable and targeted assembly steps, the problem of parts being unable to be welded is solved, and at the same time, deformation is effectively controlled to ensure welding quality.

[0025] 4. The upper ring beam diaphragm of this invention is welded to the upper flange plate, and the beveled edge is welded to the outer diagonal web plate, forming a triangular stabilizing unit, which improves the torsional rigidity of the upper flange plate and the outer diagonal web plate. The diagonal braces at the four corners of the upper ring beam, along with the upper and lower flange plates and the inner and outer web plates, form a spatial truss, effectively distributing concentrated loads, improving the load-bearing capacity of the transfer structure, and saving steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a conversion structure diagram of the present invention; Figure 2 This is a schematic diagram of the assembly of the corner corbel in step 2 of the present invention; Figure 3 、 4 This is a schematic diagram of the assembly of the side flange plate in step 2 of the present invention; Figure 5 This is a schematic diagram of assembling a U-shaped fork on a Y-shaped bending and twisting bracket in step three of the present invention; Figure 6Schematic diagram of the welding of the V-shaped bifurcated inner web, inner flange plate, bifurcated node plate, and upper ring beam corresponding diaphragm of the Y-shaped bending and twisting bracket in step three of the present invention; Figure 7 This is a schematic diagram of the assembly welding of the internal vertical partitions in step three of the present invention; Figure 8 This is a schematic diagram of the welding of the outer web in step three of the present invention; Figure 9 This is a schematic diagram of the welding of the lower outer web in step three of the present invention; Figure 10 This is a schematic diagram of the assembly of the upper flange plate, the outer inclined web plate, and the upper ring beam diaphragm of the upper ring beam in step four of the present invention; Figure 11 This is a schematic diagram of the assembly of the lower flange plate and the inner web of the upper ring beam in step 4 of the present invention; Figure 12 This is a schematic diagram of the overall assembly of the upper ring beam box in step 4 of the present invention; Figure 13 This is a schematic diagram of the weld seams of the overall assembly of the upper ring beam box body in step 4 of the present invention; Figure 14 This is a schematic diagram of the assembly and welding of the conversion structure base plate and corner brackets in step five of the present invention; Figure 15 This is a schematic diagram of the assembly and welding of the outer web and corner partitions of the lower ring beam in step five of the present invention; Figure 16 This is a schematic diagram of the assembly and welding of the upper flange plate, the partition plate, and the inner web of the lower ring beam in step five of the present invention; Figure 17 This is a schematic diagram of the assembly and welding of the Y-shaped bending and twisting bracket 4 on the left side of each corner bracket in step five of the present invention; Figure 18 Schematic diagram of the groove at F of the assembly welding of the Y-shaped bending and twisting bracket 4 on the left side of each corner bracket in step five of the present invention; Figure 19 This is a schematic diagram of the assembly and welding of the Y-shaped bending and twisting bracket 4 on the right side of each corner bracket in step five of the present invention; Figure 20 This is a schematic diagram of the assembly and welding of the five-corner support in the steps of the present invention; Figure 21 This is a schematic diagram of the overall assembly and welding of the upper ring beam in step five of the present invention.

[0027] Figure number: 1. Bottom plate, 2. Lower ring beam, 3. Corner corbel, 4. Y-shaped bending and torsion corbel, 5. Corner support, 6. Upper ring beam, 7. Diagonal brace, 8. Support corresponding partition, 9. Lower ring beam corresponding partition, 10. Side flange plate I, 11. Side flange plate II, 12. Inner web plate, 13. Outer web plate, 14. Outer flange plate, 15. U-shaped fork, 16. Forked web plate, 17. Small flange plate, 18. Inner flange plate, 19. V-shaped fork inner web plate, 20 .Node plate at the bifurcation, 21. Corresponding diaphragm of the upper ring beam, 22. Vertical diaphragm, 23. Upper outer web I, 24. Upper outer web II, 25. Lower outer web, 26. Upper flange plate, 27. Outer inclined web, 28. Upper ring beam diaphragm, 29. Lower flange plate, 30. Inner web of upper ring beam, 31. Corner diaphragm, 32. Outer web of lower ring beam, 33. Upper flange plate of lower ring beam, 34. Middle position diaphragm, 35. Inner web of lower ring beam. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, the four-corner square-shaped conversion structure includes a base plate 1, with corner brackets 3 installed at the four corners of the base plate 1. Y-shaped bending and twisting brackets 4 are provided on both sides of the corner brackets 3. The Y-shaped bending and twisting brackets 4 are fixed to the lower ring beam 2, which is installed on the base plate 1; corner supports 5 are provided on the top of the corner brackets 3, and the corner supports 5 are fixed to the inner web 12; the upper ring beam 6 is installed on the corner supports 5, and the upper ring beam 6 is fixedly connected to the inner flange plate 18 of the Y-shaped bending and twisting bracket 4. Diagonal braces 7 are fixedly installed at the four corners of the upper ring beam 6.

[0029] Parts Description: 1- Bottom plate: stabilizes the lower ring beam and transmits the upper force.

[0030] 2-Lower ring beam: stabilizes the Y-shaped bending and torsion corbel 4 and transmits the upper force.

[0031] 3-Corner brackets at four corners: Together with the upper ring beam 6 and the lower ring beam 2, they transfer the force of the lower chord of the roof truss at 45° direction of the upper column to the conversion structure base plate 1.

[0032] 4- Side Y-shaped bending and torsion bracket 4: Together with the upper ring beam 6 and the lower ring beam 2, it transmits the force of the one-way roof truss between the upper vertical columns to the conversion structure base plate 1.

[0033] 5- Corner support: transfers the load of the upper roof truss.

[0034] 6-Upper ring beam: stabilizes the upper part of the Y-shaped bending and torsion bracket 4 and transfers the force of the roof truss to the transfer structure.

[0035] 7- Diagonal braces at the four corners of the upper ring beam: improve the overall stability of the upper ring beam 6 in transmitting force.

[0036] The Y-shaped bending and twisting bracket 4 of the four-corner square statue conversion structure is difficult to process. The Y-shaped bending and twisting bracket 4 is a large-section thin-walled bending and twisting box type. The layout and expansion, cold forming, flame heat correction control of the bending and twisting parts plate all affect the bending and twisting processing accuracy, and the bending and twisting processing is difficult. The bending and twisting parts plate of this application uses Rhino software to develop the parts drawing, and then the processing allowance of the curved plate is added to the parts drawing for typesetting and cutting. Before the main body segment is processed, the rolling processing line, the partition installation position line, and the inspection reference line after forming processing are marked on the main body. The bending and twisting parts plate processing line is based on the line of the vertical horizontal plane of the main view of the main body. The parallel line of the horizontal plane line is drawn every 500mm on the vertical horizontal plane line. The processing and rolling line must be correct and inspected and accepted. The arc-shaped body is rolled by a three-roller plate rolling machine and is formed and tested by the corresponding special assembly frame until the forming processing requirements are met.

[0037] The difficulty lies in ensuring the welding quality of the four-corner square-shaped conversion structure. This conversion structure has a large number of welds, a thin plate thickness, and an upper ring beam partition 28 with a variable angle inside the box, and the main body welds are required to be fully penetrated. The distribution of the parts plates is irregular, and the welding is mainly based on de-installation and de-welding, which requires a large amount of welding space. How to ensure the welding quality and how to control deformation are difficulties. According to the characteristics of the conversion structure node, the upper ring beam 6 and the lower ring beam 2 are made separately, the corner brackets 3 are made separately, and the side Y-shaped bending and twisting brackets 4 are made separately, and then merged and docked together, and finally welded into a four-corner square-shaped conversion structure. This solution reasonably solves the problem that the partitions inside the box cannot be welded, and also ensures the weld quality of the partitions. The structure of the side Y-shaped bending and twisting brackets 4 is relatively complex, and the problem of limited assembly and welding space is solved by adopting a local main body plate: the lower outer web 25 at the rear cover side web section G. By formulating reasonable and targeted assembly steps, the problem of parts being unable to be welded is solved, while deformation is effectively controlled and welding quality is guaranteed.

[0038] The appearance requirements of the four-corner square statue conversion structure are high. The conversion structure is in the form of a four-corner square statue, and each corbel is in the shape of a single arc or a bent and twisted shape, and is accompanied by the C-level appearance requirements of the architectural exposed steel structure (AESS), which requires that the structural components should reflect the art of metal processing and have a flat surface without defects. Since there are many longitudinal welds on the outer surface of the bent and twisted corbel conversion structure box, how to ensure the appearance quality of the variable-section conversion structure node is the key point. The upper and lower ring beams and Y-shaped bent and twisted corbels 4 of the conversion structure of this application have many longitudinal and transverse welds on the outer surface. In order to ensure the appearance quality of the steel columns, the outer welds are finely ground according to the design requirements to ensure the appearance quality of the variable-section conversion structure.

[0039] The on-site port accuracy of each bending and twisting bracket of the four-corner square-shaped conversion structure is guaranteed. This conversion structure is a spatial tube structure. There are brackets in 20 directions in the entire structure, and the dimensional accuracy of the on-site docking interface is strictly controlled. The spatial assembly positioning of the corner brackets 3 and the Y-shaped bending and twisting brackets 4 on each side and the accuracy control of the on-site truss docking port are a major difficulty of this process. The assembly of each bracket of the conversion structure of this application is designed with a special assembly jig through the outer surface line shape of the corner brackets 3 and the Y-shaped bending and twisting brackets 4 on the side. The total station is used to perform spatial positioning of the part plate during the welding process. According to the characteristics of the conversion structure, the support points of the corner brackets 3 at the four corners are first welded, and then the left side P of each corner bracket 3 is assembled and welded from the outside to the inside of the main view, and the diagonal Y-shaped bending and twisting bracket 4 is assembled and welded. Finally, the right side K of each corner bracket 3 is assembled and welded from the outside to the inside of the main view, and the diagonal Y-shaped bending and twisting bracket 4 is assembled and welded. This production plan ensures the accuracy of the on-site docking port of each bracket of the conversion structure.

[0040] The construction process of the four-corner square statue conversion structure includes the following steps: 1. Production of conversion structure base plate The conversion structure's base plate 1 and corbel webs are cut using laser cutting. The flatness and lateral deflection of the body, corbel, and web should be controlled within the allowable range (lateral deflection 1.0 mm / m and ≤ 3.0 mm). The base plate 1 and corbels should be beveled simultaneously on both sides according to the drawing requirements to minimize deformation and achieve straightness. The curved body and parts must be pre-pressed using a hydraulic press or rolled using a three-roller plate rolling machine. Explosive correction is used during box assembly. The combined welds of the ring beam box and the Y-shaped bending and torsion corbel 44 must meet full penetration level 2, using backing plate welding.

[0041] 2. Production of the four corner corbels The support corresponding partition 8 and the lower ring beam corresponding partition 9 are welded between the inner web 12 and the outer web 13 of the corner corbel 3; the side flange plate I10 and the side flange plate II11 are welded on both sides of the inner web 12 and the outer web 13 respectively; the support corresponding partition 8 and the side flange plate I10 are welded and fixed, and the lower ring beam corresponding partition 9 and the side flange plate II11 are welded and fixed; the side flange plate I10 and the side flange plate II11 are welded and fixed; the upper port sealing plate is welded.

[0042] (1) Assembly of the corner bracket 3, such as Figure 2 The combined weld of the corner bracket and the box body is required to be full penetration level 1, and the pad welding method is adopted; the weld of the internal partition is required to be full penetration level 1, and the four-sided pad welding method is adopted.

[0043] (2) Assembly of side flange plates. The conversion structure is the main load-bearing structure of the roof truss, and the production and welding requirements are high. The internal partitions of the bending-torsion box corner bracket 3 are required to be fully penetrated on all four sides, and the partitions cannot be removed. The side flange plates need to be assembled separately. First, assemble the side flange plate I10 and weld the welds between the two partitions corresponding to the internal support and the side flange plate I10; then assemble the side flange plate II11 and weld the welds between the partition corresponding to the lower ring beam 2 and the side flange plate II11. Figure 3 、 4 The butt welds A and B between the side flange plate segments are required to be full penetration level 1 and welded with backing plates. The upper end plate weld is required to be a partial penetration weld with a single-sided groove around the perimeter.

[0044] 3. Fabrication of Y-shaped bending and twisting brackets on four sides of the conversion structure (1) The structure type of the Y-shaped bending and twisting brackets 4 on the four sides of the conversion structure is the same, and the manufacturing and assembly steps are the same. The assembly of the other three Y-shaped bending and twisting brackets 4 refers to this process flow. In order to ensure that the curvature of the outer flange plate 14 of the Y-shaped bending and twisting bracket 4 on one side is consistent, the two Y-shaped bending and twisting brackets 4 on the same side need to be assembled and manufactured on the same tire frame at the same time, such as Figure 5 First, place the outer flange plate 14 on a qualified tire frame (tire frame accuracy ±1mm), and then assemble the bifurcated webs 16 and small flange plates 17 on both sides of the U-shaped bifurcation 15 at the bifurcation of the Y-shaped bending and torsion bracket 4. The combined welds of the U-shaped bifurcation 15 at the bifurcation and the welds with the outer flange plate 14 are required to be full penetration level 1. Pad welding is adopted, with the groove facing the inner side of the Y-shaped bending and torsion bracket 4 box, and a ceramic liner is selected on the outside.

[0045] (2) Assembly welding of the V-shaped bifurcated inner web 19, inner flange plate 18, bifurcated node plate 20, and upper ring beam corresponding partition 21 of the Y-shaped bending and torsion corbel.

[0046] like Figure 6 The V-shaped fork inner web 19 is welded and fixed to the outer flange plate 14 and the inner flange plate 18, and the upper ring beam corresponding to the partition plate 21 and the fork node plate 20 are welded to the V-shaped fork inner web 19; the upper ring beam corresponding to the partition plate 21, the fork node plate 20 and the outer flange plate 14 and the inner flange plate 18 are welded and fixed.

[0047] The combined welds of the V-shaped bifurcation inner web 19 of the Y-shaped bent torsion bracket 4 are required to be full penetration level 1, and pad welding is adopted. The groove within 800mm length of the root of the V-shaped angle at the bifurcation part faces the inner side of the Y-shaped bent torsion bracket 4 box, and a ceramic liner is selected on the outer side; the groove of the main body in the other ranges outside the 800mm length faces the outer side of the Y-shaped bent torsion bracket 4 box.

[0048] The weld of the node plate 20 at the fork portion of the V-shaped fork portion is required to be full penetration level 1, and adopts the four-sided pad welding form with the groove facing the lower end.

[0049] The welds of the upper ring beam corresponding to the partition 21 are required to be full penetration level 1, and four-sided pad welding is adopted, with the groove facing the box opening of the Y-shaped bending and torsion bracket 4.

[0050] (3) Assembly welding of internal vertical partitions. One side of the vertical partition 22 is welded to the small flange plate 17, as shown in the figure. Figure 7 The other side is welded to the inner flange plate 18. The welds of the two vertical partitions 22 are required to be full penetration level 1, and four-sided pad welding is adopted, with the groove facing the larger space (cover plate side).

[0051] (4) Assembly welding of the outer web. First, weld the upper outer web I 23 to the outer flange plate 14 and the inner flange plate 18, and weld the upper outer web I 23 to the corresponding partition 21 of the upper ring beam; secondly, weld the upper outer web II 24 to the outer flange plate 14 and the inner flange plate 18, and weld the upper outer web II 24 to the node plate 20 at the fork. The conversion structure belongs to the main load-bearing structure of the roof truss, and the production and welding requirements are high. The internal partitions of the Y-shaped bending and torsion bracket 4 are required to be fully penetrated on all four sides, and the partitions cannot be removed. The outer web needs to be assembled separately. First, assemble the first section of the upper outer web I 23, and weld the two partitions corresponding to the internal upper ring beam 6 and the upper outer web I 23; then assemble the second section of the upper outer web II 24, and weld the weld between the node plate 20 at the internal fork and the upper outer web II 24. As Figure 8 The combined welds C and D of the outer web body must both be full penetration, using backing plate welding, with the body groove facing the outside of the Y-shaped torsion bracket 4 box. The butt welds between the outer web segments must both be full penetration, using backing plate welding. The upper end plate weld must be partial penetration, using a single-sided groove around the perimeter.

[0052] (5) Assembly welding of the lower outer web. Figure 9 , the lower outer web 25 is welded and fixed to the outer flange plate 14 and the inner flange plate 18; the lower outer web 25 of one of the Y-shaped bent torsion corbels 4 is temporarily put on hold for assembly. There are many corbels inside the conversion structure, and the welding space between the corner corbels 3 and the Y-shaped bent torsion corbels 4 and the lower ring beam 2 is limited. The combined welds of the outer web bodies that are assembled first are all required to be fully penetrated to level one, and pad welding is adopted, with the outer web body groove facing the outside of the Y-shaped bent torsion corbel 4 box. The lower outer web 25 section that is temporarily put on hold for assembly is the right side K of the corner corbel at the opening of the double Y-shaped bent torsion corbel 4 on each side. From the outside to the inside of the main view, the outer web of the Y-shaped bent torsion corbel 4 will be installed and welded during the subsequent overall assembly.

[0053] 4. Production of trapezoidal upper ring beam box (1) Assembly of the upper flange plate 26, the outer inclined web plate 27, and the upper ring beam partition plate 28 of the upper ring beam 6. In view of the characteristics of the trapezoidal box of the upper ring beam, the upper ring beam 6 is assembled using the reverse method. The outer inclined web plate 27 of the upper ring beam 6 is a curved plate and needs to be pressed and formed in advance using a hydraulic press. The upper flange plate 26 of the upper ring beam 6 is placed horizontally on a tire frame that has passed the inspection and the flatness is controlled (accuracy ±1mm). Figure 10 The long sides of the upper flange plate 26 and the outer inclined web plate 27 are welded together, and the upper ring beam partition 28 is welded between the upper flange plate 26 and the outer inclined web plate 27. The long sides of the upper ring beam partition 28 are welded to the upper flange plate 26, and the inclined sides are welded to the outer inclined web plate 27. The inner upper ring beam partition 28 is marked and assembled and positioned. The weld of the upper ring beam partition 28 is required to be full penetration level 1, and a three-side pad welding method is used. The inner web side of the other side is tightened and not welded. The groove is facing the space with large space. When the space is insufficient, the assembly and welding are reversed. The outer inclined web plate 27 is assembled, and the cold working pressing deviation is checked by pyrotechnics.

[0054] (2) Assembly of the lower flange plate 29 and the inner web plate 30 of the upper ring beam. Figure 11 The lower flange plate 29 is welded to the upper ring beam diaphragm 28, and the long side of the lower flange plate 29 is welded to the outer inclined web 27. The inner web 30 of the upper ring beam is welded to the outer side of the upper ring beam diaphragm 28. The upper ring beam 6 body weld is required to be full penetration level 1, using a backing plate weld.

[0055] (3) Overall assembly of the upper ring beam 6 box. Figure 12 , the upper flange plates 26, the lower flange plates 29, the outer inclined webs 27, and the inner webs 30 of the upper ring beams are butt-welded to form a square upper ring beam 6; the four corners of the upper ring beam 6 are welded with diagonal braces 7. Figure 13 The butt welds between the flange and web of the upper ring beam 6 are required to be full penetration level 1, and pad welding is adopted; the welds between the four corner diagonal braces 7 inside the upper ring beam 6 and the upper ring beam 6 are required to be three-sided pad welding full penetration level 1, and the sharp angle edges are single-sided fillet welds, and the size of the weld angle is the thickness of the diagonal brace 7 box plate.

[0056] The upper ring beam diaphragm 28 is welded to the upper flange plate 26, and the beveled edge is welded to the outer diagonal web 27, forming a triangular stabilizing unit. This improves the torsional rigidity of the upper and outer diagonal webs 27. The diagonal braces 7 at the four corners of the upper ring beam 6, along with the upper and lower flange plates 29 and the inner and outer webs, form a spatial truss, effectively distributing concentrated loads and improving the transfer structure's bearing capacity while conserving steel. This achieves a harmonious balance of function, efficiency, and aesthetics.

[0057] 5. Overall assembly steps of the four-corner square statue conversion structure (1) Assembly and welding of the conversion structure base plate and corner brackets. Figure 14, the base plate 1 of the conversion structure is placed on a horizontal reference surface, and the four corner brackets 3 at the corners are assembled. The weld between the corner brackets 3 and the base plate 1 of the conversion structure is required to be full penetration level 1, and the backing plate welding form is adopted.

[0058] (2) Assembly and welding of the outer web and corner partitions of the lower ring beam. Figure 15 The lower ring beam's outer web 32 and corner bulkhead 31 are welded to the bottom plate 1. The welds on the lower ring beam's outer web 32 are required to be full penetration level 1, using backing plate welding. The welds on the lower ring beam's corner bulkhead 31 are required to be full penetration level 1, using backing plate welding on three sides. The inner web on the other side is tightened and not welded.

[0059] (3) Assembly and welding of the upper flange plate, partition plate and inner web of the lower ring beam. Figure 16 , weld the lower ring beam upper flange plate 33 onto the lower ring beam outer web 32 and corner partition 31, remove the intermediate partition 34, and finally weld the lower ring beam inner web 35; the lower ring beam upper flange plates 33 are welded to each other to form a square lower ring beam 2. The lower ring beam outer web 32, lower ring beam upper flange plate 33, intermediate partition 34, and lower ring beam inner web 35 form a spatial frame. The intermediate partition 34 improves stress balance, optimizes steel material distribution, and ensures load-bearing capacity, effectively saving materials. Assemble and weld the lower ring beam upper flange plate 33, remove the intermediate partition 34, and finally cover the lower ring beam inner web 35. The butt welds between the lower ring beam upper flange plate 33 and the lower ring beam inner web 35 are required to be full penetration level 1, using pad welding. The main body combined weld E of the lower ring beam 2 is required to be full penetration level 1, using pad welding.

[0060] (4) The left side P of each corner bracket, from the outside to the inside of the main view, the assembly welding of the diagonal Y-shaped bending bracket 4. Figure 17 The inner flange plate 18 of the left Y-shaped bending and twisting bracket 4 is welded to the edge of the lower ring beam upper flange plate 33 of the lower ring beam 2, and the lower outer web plate 25 is welded to the inner web plate 35 of the lower ring beam and the lower ring beam upper flange plate 33; the bottom end of the outer flange plate 14 is welded to the bottom plate 1. Y-shaped bending and twisting brackets 4 are installed on the left side of each corner bracket 3. The Y-shaped bending and twisting brackets 4 and the lower ring beam 2 form a support, transfer force, and improve the overall bearing capacity of the conversion structure. Figure 18 The welds between the left Y-shaped bending and torsion bracket 4 and the lower ring beam 2 are required to be full penetration level 1, and pad welding is adopted, with the grooves at F facing the outside of the box.

[0061] (5) The right side K of each corner bracket, from the outside to the inside of the main view, the assembly welding of the diagonal Y-shaped bending bracket 4. Figure 19The inner flange plate 18 is welded to the edge of the lower ring beam upper flange plate 33 of the lower ring beam 2. The outer lower outer web 25 is welded to the lower ring beam inner web 35 and the lower ring beam upper flange plate 33. The bottom end of the outer flange plate 14 is welded to the base plate 1. At the rear cover side web section G, the inner lower outer web 25, which was left due to the temporary welding delay, is welded to the inner flange plate 18, the lower ring beam inner web 35, and the lower ring beam upper flange plate 33. The Y-shaped bending and twisting brackets 4 on the left and right sides of each corner corbel 3, together with the lower ring beam 2, the upper ring beam 6, and the corner corbels 3, form a blooming four-corner square-shaped conversion node. This can be used to convert different steel column and roof truss spatial structures, and has the advantages of high force bearing capacity, reasonable force transmission, structural stability, novel design, and steel saving. The weld between the right Y-shaped bending and twisting bracket 4 and the lower ring beam 2 is required to be full penetration level 1, and pad welding is used. Groove direction: The grooves of the lower outer web 25 and the lower ring beam 2 that are assembled first are facing the inner side of the Y-shaped bent torsion bracket 4 box, and a ceramic liner is optionally affixed to the outer side; the grooves of the lower outer web 25 and the inner flange plate 18 of the rear cover side web section and the lower ring beam 2 are all facing the outer side of the Y-shaped bent torsion bracket 4 box.

[0062] (6) Assembly welding of corner supports. The combined weld of the corner support 5 box body is required to be full penetration level 1, and the backing plate welding method is adopted. Figure 20 The corner support 5 is welded to the inner web 12 of the corner bracket 3. The welds between the corner support 5 and the upper ring beam 6 and the corner bracket 3 are all required to be full penetration level 1, and pad welding is adopted.

[0063] (7) Overall assembly welding of the upper ring beam. Figure 21 The upper ring beam 6 is welded to the corner supports 5 and the Y-shaped bending and torsion bracket 4. The outer diagonal web 27 of the upper ring beam 6 is welded to the inner flange plate 18 of the corner supports 5 and the Y-shaped bending and torsion bracket 4. The welds between the upper ring beam 6 and the Y-shaped bending and torsion bracket 4 are required to be full-circle fillet welds with a weld angle of 14 mm. These 14 mm full-circle fillet welds are arranged continuously along the perimeter of the joint, creating a 360° closed weld and a closed force transmission path, improving structural integrity and enhancing the load-bearing capacity of the transfer structure.

[0064] AESS treatment of the exposed surfaces of the four-corner square-shaped transfer structure: All four exterior surfaces of the transfer structure in this project meet the Class C requirements of the architectural exposed steel structure (AESS). All butt welds and fillet welds on the four exterior surfaces must be completely polished and smooth, with no noticeable difference from the surrounding parent material. T-joint welds must be polished to remove fish scale marks, with the surface transitioning to the parent material in a uniform, concave, continuous arc. The arc of fillet welds within the same section must remain consistent. All parent material defects, weld spatter, debris, and similar surface discontinuities on the corner corbels 3, Y-shaped bending and twisting corbels 4, and upper and lower ring beams 6 and 2 must be removed, repaired, and polished smooth in accordance with AESS requirements.

[0065] The inspection standard for the four-corner square-shaped conversion structure shall be implemented in accordance with the "Code for Acceptance of Construction Quality of Steel Structure Engineering" GB50205-2020, and each error shall be controlled with high requirements according to 1 / 2 of GB50205-2020.

[0066] The four-corner square-shaped conversion structure has a complex structure and large external dimensions, and the on-site roof truss installation requires high precision. On the premise of improving the precision of individual parts and ensuring the overall precision, the guiding principle of "breaking the whole into parts and striving for excellence" is determined. The four-corner square-shaped conversion structure is formed to meet the size requirements of the drawing and is measured and inspected on the steel frame. The structural process flow is as follows: marking the ground positioning reference line → making a special assembly frame → base plate 1 of the conversion structure → assembly and welding of the four corner brackets 3 → assembly and welding of the lower ring beam 2 box → assembly and welding of the four side Y-shaped bending and torsion brackets 4 → assembly of the upper ring beam 6 box corner supports 5 → assembly and welding of the upper ring beam 6 box and overall positioning → integrity acceptance.

[0067] The four-corner square-shaped conversion structure is a three-dimensional structure with numerous on-site roof truss docking ports. The node components of the four-corner square-shaped conversion structure have complex cross-sectional types and diverse bend radii. For professional heavy steel structure manufacturers, it is necessary to research various processing and manufacturing methods for the four-corner square-shaped conversion structure node structures. A processing technology has been developed to cover the steps of single / double bending and torsion corbels, groove cutting, bending and torsion plate processing and forming, spatial positioning of the assembly of the four-corner square-shaped conversion structure node components, and precision control of the on-site high-altitude docking ports of the roof trusses. This reduces manufacturing costs, improves production efficiency, and ensures construction progress while meeting customer requirements. Based on the characteristics of the conversion structure, this application first welds the support points of the corner corbels 3 at the four corners, then assembles and welds the Y-shaped bending and torsion corbels 4 on the diagonal left side of each corner corbel 3, and finally assembles and welds the Y-shaped bending and torsion corbels 4 on the diagonal right side of each corner corbel 3. This manufacturing method ensures the precision of the on-site docking ports of each corbel in the conversion structure. The lower outer web 25 of one of the Y-shaped torsion brackets 4 on each side is welded during overall assembly. This solution, in which a partial main plate is installed laterally, addresses the limited assembly and welding space. By developing a rational and targeted assembly procedure, the problem of parts being unable to be welded is resolved, while deformation is effectively controlled and welding quality is guaranteed.

[0068] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. The construction process of the four-corner square statue conversion structure is characterized by: The steps include: Step 1: Make the base of the conversion structure Step 2: Make the four corner corbels The support corresponding diaphragm (8) and the lower ring beam corresponding diaphragm (9) are welded between the inner web (12) and the outer web (13) of the corner corbel (3); the side flange plate I (10) and the side flange plate II (11) are welded to both sides of the inner web (12) and the outer web (13); the support corresponding diaphragm (8) and the side flange plate I (10) are welded and fixed, and the lower ring beam corresponding diaphragm (9) and the side flange plate II (11) are welded and fixed; the side flange plate I (10) and the side flange plate II (11) are welded and fixed; the upper end sealing plate is welded; Step 3: Make the four-side Y-shaped twisted bracket S1, the outer flange plate (14) of the Y-shaped bending and twisting bracket (4) is placed on the tire frame, and the bifurcated webs (16) and the small flange plates (17) on both sides of the U-shaped bifurcation (15) at the bifurcation position of the Y-shaped bracket are welded and assembled on the outer flange plate (14); two Y-shaped bending and twisting brackets (4) on the same side are assembled and manufactured on the same tire frame at the same time; S2, assembling and welding the V-shaped bifurcated inner web (19), inner flange plate (18), bifurcated node plate (20), and upper ring beam corresponding diaphragm (21) of the Y-shaped bending and torsion bracket (4); The V-shaped bifurcated inner web (19) is welded to the outer flange plate (14) and the inner flange plate (18); the upper ring beam corresponding diaphragm (21) and the bifurcated node plate (20) are welded to the V-shaped bifurcated inner web (19); the upper ring beam corresponding diaphragm (21), the bifurcated node plate (20) and the outer flange plate (14) and the inner flange plate (18) are welded to the V-shaped bifurcated inner web (19); S3, welding the internal vertical partition (22) One side of the vertical partition (22) is welded to the small flange plate (17), and the other side thereof is welded to the inner flange plate (18); S4, welding the upper outer web First, the upper outer web plate I (23) is welded to the outer flange plate (14) and the inner flange plate (18), and the upper outer web plate I (23) is welded and fixed to the corresponding partition plate (21) of the upper ring beam; secondly, the upper outer web plate II (24) is welded to the outer flange plate (14) and the inner flange plate (18), and the upper outer web plate II (24) is welded and fixed to the node plate (20) at the bifurcation position; S5, weld the lower outer web (25) The lower outer web (25) is welded to the outer flange (14) and the inner flange (18); the lower outer web (25) of one of the Y-shaped bending and twisting brackets (4) is temporarily assembled; Step 4: Make a trapezoidal upper ring beam box Step 5: Assemble the four-corner square statue conversion structure S1, assembling the base plate (1) and the corner brackets (3); placing the base plate (1) on a horizontal reference surface, and welding the four corner brackets (3); S2, assembling the outer web (32) and the corner partition (31) of the lower ring beam; welding the outer web (32) and the corner partition (31) of the lower ring beam to the bottom plate (1); S3, assembling the lower ring beam upper flange plate (33), the middle position partition plate (34), and the lower ring beam inner web plate (35); S4, assembling the Y-shaped bending and twisting bracket (4) on one side of each corner bracket (3); S5, assembling the Y-shaped bending and twisting bracket (4) on the other side of each corner bracket (3); welding the lower outer web (25) remaining due to temporary welding at the rear cover side web section G of the Y-shaped bending and twisting bracket (4); S6, assembling the corner support (5); the corner support (5) is welded to the inner web (12) of the corner bracket (3); S7, assembling the upper ring beam (6); welding and fixing the upper ring beam (6), the corner support (5), and the Y-shaped bending and torsion bracket (4).

2. The construction process of the four-corner square-shaped conversion structure according to claim 1 is characterized in that: Step 4: Make a trapezoidal upper ring beam (6) box: S1, assembling the upper flange plate (26), the outer inclined web plate (27), and the upper ring beam partition plate (28); the long sides of the upper flange plate (26) and the outer inclined web plate (27) are welded together, and the upper ring beam partition plate (28) is welded between the upper flange plate (26) and the outer inclined web plate (27); the long side of the upper ring beam partition plate (28) is welded and fixed to the upper flange plate (26), and the oblique side is welded and fixed to the outer inclined web plate (27); S2, assembling the lower flange plate (29) and the inner web plate (30) of the upper ring beam; the lower flange plate (29) is welded to the upper ring beam diaphragm (28), and the long side of the lower flange plate (29) and the outer inclined web plate (27) are welded and fixed; the inner web plate (30) of the upper ring beam is welded to the outer side of the upper ring beam diaphragm (28); S3, overall assembly of the upper ring beam (6) box The upper flange plates (26), the lower flange plates (29), the outer inclined web plates (27), and the inner web plates (30) of the upper ring beam are butt-welded to form a square upper ring beam (6); and the four corners of the upper ring beam (6) are all welded with diagonal braces (7).

3. The construction process of the four-corner square-shaped conversion structure according to claim 1 is characterized in that: In the step five, S3, the lower ring beam upper flange plate (33), the middle position partition plate (34), and the lower ring beam inner web plate (35) are assembled: the lower ring beam upper flange plate (33) is welded to the lower ring beam outer web plate (32) and the corner partition plate (31), the middle position partition plate (34) is removed, and finally the lower ring beam inner web plate (35) is welded; the lower ring beam upper flange plates (33) are welded and butted against each other to form a square lower ring beam (2).

4. The construction process of the four-corner square urn type conversion structure according to claim 1 is characterized in that: In the step five, S4, a Y-shaped bending and twisting bracket (4) is assembled on one side of each corner bracket (3): the Y-shaped bending and twisting bracket (4) is welded to the lower ring beam (2), the inner flange plate (18) and the edge of the lower ring beam upper flange plate (33) of the lower ring beam (2) are welded, and the lower outer web plate (25) and the inner web plate (35) of the lower ring beam and the lower ring beam upper flange plate (33) are welded; the bottom end of the outer flange (14) is welded to the bottom plate (1).

5. The construction process of the four-corner square-shaped conversion structure according to claim 1 is characterized in that: In the step five, S5, the Y-shaped bending and twisting bracket (4) on the other side of each corner bracket (3) is assembled: the Y-shaped bending and twisting bracket (4) is welded to the lower ring beam (2); the inner flange plate (18) and the edge of the lower ring beam upper flange plate (33) of the lower ring beam (2) are welded, and the outer lower outer web plate (25) is welded to the inner web plate (35) of the lower ring beam and the lower ring beam upper flange plate (33); the bottom end of the outer flange plate (14) is welded to the bottom plate (1); the inner lower outer web plate (25) left due to the temporary suspension of assembly is welded to the inner flange plate (18), the lower ring beam inner web plate (35), and the lower ring beam upper flange plate (33).

6. The construction process of the four-corner square-shaped conversion structure according to claim 1 is characterized in that: In the step 5, the four-corner square-shaped conversion structure is assembled as a whole. In S7, the weld between the inner flange plate (18) of the Y-shaped bending and twisting bracket (4) and the outer inclined web (27) of the upper ring beam (6) is required to be a one-circle fillet weld with a weld angle of 14 mm.

7. A square-shaped conversion structure manufactured by the construction process of the square-shaped conversion structure according to any one of claims 1 to 6, characterized in that: The invention comprises a bottom plate (1), corner brackets (3) are installed at the four corners of the bottom plate (1), Y-shaped bending and twisting brackets (4) are respectively arranged on both sides of the corner brackets (3), the Y-shaped bending and twisting brackets (4) are fixed on the lower ring beam (2), and the lower ring beam (2) is arranged on the bottom plate (1); the inner flange plate (18) of the corner support (5) is arranged on the top of the corner bracket (3) for fixed connection.

8. The square-shaped conversion structure according to claim 7, characterized in that: The four corners of the upper ring beam (6) are fixed with diagonal braces (7).

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