Hollowed-out Y-shaped variable cross-section box-shaped column shaped like Chinese character'Yi 'and construction technology thereof

Abstract

The invention relates to the technical field of steel structures, and discloses a hollow Y-shaped variable cross-section box-shaped column shaped like a Chinese character'Ya 'and a construction technology thereof.The box-shaped column comprises a box-shaped column shaped like a Chinese character'Ya', a Y-shaped box body section and a crotch bracket, the extending end of a main shaft of the Y-shaped box body section is connected with the box-shaped column shaped like a Chinese character'Ya ', and the middle of the Y-shaped box body section is trilateral hollow. The inner ring wing plate and the web plate are assembled and welded; hollowed-out web plates on the two sides of the Y-shaped box body section body are assembled and welded with the transverse partition plates and the longitudinal rib plates; the I-shaped arc is assembled and welded with the inner ring wing plate and the web plate; the box-type bracket side plates and the transverse partition plates are assembled and welded; the box-type bracket is assembled and welded; the T-shaped box column is in butt welding with the Y-shaped box body section; and assembling and welding the crotch corbel. The box type steel columns shaped like the Chinese character'Ya 'and the Y-shaped joints are adopted for combined supporting force, the overall stability and stress of the conversion joints are improved through the hollowed-out triangular reinforcing plates, and the device has the advantages of being large in stress, reasonable in force transmission, stable in structure, novel in modeling, capable of saving steel and the like.

Description

Technical Field

[0001] The present invention relates to the field of steel structures, and particularly to a hollow Y-shaped variable cross-section sub-character box column and its construction process. Background Art

[0002] In order to be coordinated with urban planning, the first-floor track-bearing layer structure of some existing high-speed railway projects needs to adopt a "building-bridge" integrated frame structure, including reinforced concrete columns + prestressed concrete frame beams + cast-in-place concrete floor slabs. In this case, a hollow Y-shaped variable cross-section sub-character box column is required as a structural member for the platform awning. The component node types are complex, the bending pipe arcs are diverse, the spatial shape is peculiar, and all are exposed steel columns with extremely high appearance requirements.

[0003] The patent application with publication number CN 115492308A discloses a Y-shaped supporting steel structure and its manufacturing method. The Y-shaped supporting steel structure includes a lower multi-chamber box column body in the form of a box-type multi-chamber steel structure, a first upper branched cross-shaped column body, and a second upper branched cross-shaped column body. The first upper branched cross-shaped column body and the second upper branched cross-shaped column body are fixed to the same end of the lower multi-chamber box column body, and the first upper branched cross-shaped column body and the second upper branched cross-shaped column body are arranged symmetrically in the two side directions of the lower multi-chamber box column body.

[0004] This existing technology has a simple shape, limited force-bearing capacity,有待提高 the structural stability, and the external structure is not beautiful enough.

[0005] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a hollow Y-shaped variable cross-section sub-character box column and its construction process. By means of a hollow triangular reinforcing plate, the overall stability and force-bearing capacity of the conversion node are improved, the steel plate consumption is reduced and the appearance is beautified. Finally, a new awning is formed through the upper steel beam system. The steel column of the spatial structure has the advantages of large force-bearing capacity, reasonable force transmission, stable structure, novel shape, and steel saving.

[0007] The technical solution adopted by the present invention is as follows: A hollow Y-shaped variable cross-section sub-character box column includes a sub-character box column, a Y-shaped box body section, and a fork-shaped bracket. The main axis extension end of the Y-shaped box body section is connected to the sub-character box column. The middle part of the Y-shaped box body section is a triangular hollow, and the two outer sides of the bifurcated and extended ends of the Y-shaped box body section are respectively connected to the fork-shaped brackets, and the fork-shaped brackets are fixed on the box-type bracket side plates.

[0008] Preferably, the upper and lower sides of the Y-shaped box body section are covered with hollow web plates, and the outer sides of the two sides of the bifurcated and extended Y-shaped box body section are outer wing plates.

[0009] Preferably, between the hollow webs on both sides of the middle hollow part of the Y-shaped box body section are V-shaped inner ring wing plates and transversely arranged webs, the webs are arranged between the two ends of the inner ring wing plates, and the connections between the two ends of the webs and the inner ring wing plates are provided with I-shaped arcs, and the I-shaped arcs are located on the inner side of the middle hollow part of the Y-shaped box body section.

[0010] Preferably, a wing plate partition, a longitudinal rib plate, a rib plate partition and a corbel partition are provided between the hollow webs on both sides of the Y-shaped box section and the outer wing plates for connection and fixation.

[0011] By adopting the above structure, using Y-shaped box columns and Y-shaped box segment connection structure, the overall stability and force of the conversion node are improved through hollow triangular reinforcement plates, the amount of steel plates is reduced and the appearance is improved. Finally, the upper steel beam system is used for conversion to form a new type of canopy. The steel columns of the spatial structure have the advantages of large force, reasonable force transmission, stable structure, novel shape, and saving steel.

[0012] Preferably, the inner side of the box-type corbel side panel is connected to the inner ring wing plate through a vertical rib plate and a side panel cross partition, and an intermediate sealing plate is provided between the box-type corbel side panels on both sides, and the intermediate sealing plate is located on the top surface of the Y-shaped box body section.

[0013] Preferably, the fork corbel middle plug plate of the fork corbel is connected and fixed to the corbel wing plate on the box-type corbel side plate.

[0014] By adopting the above structure, the steel column has a stable structure, a novel shape, and saves steel.

[0015] Preferably, a construction process of a hollow Y-shaped variable-section box-shaped column comprises the following steps: Step 1: Make the parts of the Y-shaped box column, Y-shaped box section, and tree branch bracket; Step 2: Assemble and weld the inner ring wing plate and the web plate. The weld between the web plate and the inner ring wing plate is required to be full penetration backing plate welding level 1. The weld between the inner ring wing plates is required to be full penetration backing plate welding level 1. The weld excess height between the inner ring wing plate and the web plate of the main body needs to be controlled within 2mm; Step 3: The hollow webs on both sides of the Y-shaped box body are assembled and welded with the wing plate diaphragms, longitudinal ribs, rib diaphragms, and corbel diaphragms. The welds between the longitudinal ribs and the inner ring wing plates and the above diaphragms are required to be full penetration pad welding of level 1. The welds between the longitudinal ribs, the above diaphragms and the hollow webs are required to be double-sided fillet welds according to the plate thickness t≤16mm, and partial penetration double-sided welds according to t>16mm; Step 4: Assemble and weld the I-shaped arc with the inner ring wing plate and the web plate. The butt weld between the I-shaped arc and the inner ring wing plate and the web plate is required to be a first-level full penetration root cleaning weld. The weld between the I-shaped arc notch and the inner ring wing plate and the web plate adopts an overall surfacing arc. The inner diameter of the I-shaped arc requires an overall polished arc transition, and the arc flatness tolerance is controlled to be 0~3mm; Step 5: Assemble and weld the box-type corbel side panels and the diaphragm. The welds between the box-type corbel side panels and the hollow webs are required to be full penetration backing plate welding level 1, and the welds between the middle diaphragm are required to be full penetration backing plate welding level 1; Step 6: Assemble and weld the inner vertical ribs of the box-type corbel side panels, the side panel diaphragms, and the middle cover. The welds of the vertical ribs are required to be three-sided single-sided fillet welds. The top of the column is tight and not welded. The welds of the side panel diaphragms are required to be full penetration four-sided pad welding, and the welds of the middle cover are required to be partial penetration single-sided groove sealing welding. Step 7: Assemble and weld the corbels. The combined weld of the box-type corbels is required to be a first-grade full penetration backing plate weld. The weld of the box-type corbels and the hollow belly plate is required to be a first-grade full penetration backing plate weld. The weld of the sealing plate is required to be a single-sided fillet weld. Step 8: The Y-shaped box column and the Y-shaped box section are butt welded. The weld between the longitudinal rib plate and the connecting web is required to be a full penetration backing plate welding of level 1. The butt weld between the hollow web and the Y-shaped box column is required to be a full penetration backing plate welding of level 1. Step 9: Assemble and weld the outer wing plate. The weld between the hollow web and the outer wing plate is required to be a full penetration pad weld of level 1. The butt weld between the outer wing plate and the sub-shaped box column is required to be a full penetration pad weld of level 1. The weld between the outer wing plate and the box-shaped corbel side plate is required to be a single-sided fillet weld with a weld angle of 1.5t, where t is the thickness of the thin plate. Step 10: Assemble and weld the outer sealing plate and the reinforcing partition. The weld of the reinforcing partition is required to be a full penetration four-sided backing plate weld of level 1, and the weld of the outer sealing plate is required to be a partial penetration single-sided groove weld; Step 11: Assemble and weld the middle plug plate and the wing plate of the tree fork corbel. The welds between the middle plug plate of the tree fork corbel and the side plate and wing plate of the box-type corbel are required to be full penetration and root clearing welding of level 1. The welds between the wing plate of the corbel and the side plate of the box-type corbel are required to be full penetration and pad welding of level 1. Step 12: Assemble and weld the inner web of the corbel. The combined weld of the inner web of the corbel and the corbel wing plate is required to be a first-grade full penetration backing plate weld. The groove faces the outside of the box-type corbel. The weld of the inner web of the corbel and the middle insert of the branch corbel is required to be a first-grade full penetration root clearing weld. The weld of the corbel sealing plate is required to be a single-sided fillet weld. Step 13: Assemble and weld the outer web of the corbel. The welds between the outer web of the corbel and the corbel wing plate and the hollow web are required to be full penetration backing plate welding of level 1; Step 14: Assemble and weld the lifting ears and connecting ear plate accessories.

[0016] By adopting the above-mentioned process, the processing technology of special components is clarified. The welding process can prevent welding cracks and reduce welding stress to ensure the processing quality. In addition, the outer welds are polished accordingly according to the design requirements to ensure the appearance quality of the variable-section steel column nodes.

[0017] Preferably, in step 1, the outer wing plate of the Y-shaped box section needs to be suppressed for reverse deformation, and the outer wing plate needs to meet the tolerance requirements after welding. The corbel wing plate of the fork corbel needs to be bent using a hydraulic press. When bending, a 6mm thin plate needs to be placed on the plate to avoid obvious indentations on the corbel flange. After the rectangular corbel is cut, a corresponding groove is opened to facilitate the subsequent assembly and welding of the corbel.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The device of the present invention adopts a combined support force of a Y-shaped box steel column and a Y-shaped node, and improves the overall stability and force of the conversion node through a hollow triangular reinforcement plate, reduces the amount of steel plate and improves the appearance. Finally, it is converted through the upper steel beam system to form a new type of canopy. The steel column of the spatial structure has the advantages of large force, reasonable force transmission, stable structure, novel shape, and saving steel.

[0019] 2. The device of the present invention has complex node types, various curvatures of curved pipes, and peculiar spatial shapes. As exposed steel columns, the external structure is beautiful.

[0020] 3. The process of the present invention clarifies the processing technology of special components and the arrangement of welding steps, with high operating efficiency. The welding process can prevent welding cracks and reduce welding stress, ensuring the processing quality. In addition, the outer welds are polished accordingly according to the design requirements to ensure the appearance quality of the variable-section steel column nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of process step 2 of the present invention; Figure 3 It is a structural schematic diagram of process step 3 of the present invention; Figure 4 It is a structural schematic diagram of process step 4 of the present invention; Figure 5 It is a structural schematic diagram of process step 5 of the present invention; Figure 6 It is a structural schematic diagram of process step 6 of the present invention; Figure 7 It is a structural schematic diagram of process step 6 of the present invention; Figure 8 It is a structural schematic diagram of process step 7 of the present invention; Fig. 9 It is a structural schematic diagram of process step 8 of the present invention; Fig.10 It is a structural schematic diagram of process step 9 of the present invention; Fig.11 It is a structural schematic diagram of process step 10 of the present invention; Fig.12 It is a structural schematic diagram of process step 11 of the present invention; Fig.13 It is a structural schematic diagram of process step 12 of the present invention; Fig.14 It is a structural schematic diagram of process step 13 of the present invention.

[0022] Among them: 1. Y-shaped box column; 2. Y-shaped box section; 4. Hollow web; 7. Tree fork corbel; 8. Inner ring wing plate; 9. Web; 10. Wing plate diaphragm; 11. Longitudinal rib plate; 12. Rib plate diaphragm; 13. Corbel diaphragm; 14. I-shaped arc; 15. Box corbel side plate; 16. diaphragm; 17. Vertical rib plate; 18. Side plate diaphragm; 19. Middle sealing plate; 20. Box corbel; 21. Connecting web; 22. Outer wing plate; 23. Outer sealing plate; 24. Strengthening partition; 25. Middle plug plate of tree fork corbel; 26. Corbel wing plate; 27. Inner web of corbel; 28. Outer web of corbel; 29. ​​Sealing plate; 30. Corbel sealing plate. DETAILED DESCRIPTION

[0023] like Figure 1 As shown, a hollow Y-shaped variable-section Y-shaped box column includes a Y-shaped box column 1, a Y-shaped box section 2, and a branch corbel 7. The main axis extension end of the Y-shaped box section 2 is connected to the Y-shaped box column 1, the middle part of the Y-shaped box section 2 is a triangular hollow, and the outer sides of the two ends of the forked extension of the Y-shaped box section 2 are respectively connected to the branch corbel 7, and the branch corbel 7 is fixed on the box corbel side plate 15.

[0024] The upper and lower sides of the Y-shaped box segment 2 are covered with hollow webs 4, and the outer sides of the bifurcated extension of the Y-shaped box segment 2 are outer wing plates 22. Between the hollow webs 4 on both sides of the middle hollow of the Y-shaped box segment 2 are V-shaped inner ring wing plates 8 and transversely arranged webs 9, the webs 9 are arranged between the two ends of the inner ring wing plates 8, and the connection between the two ends of the webs 9 and the inner ring wing plates 8 is provided with I-shaped arcs 14, and the I-shaped arcs 14 are located inside the middle hollow of the Y-shaped box segment 2.

[0025] A wing plate transverse partition 10, a longitudinal rib plate 11, a rib plate transverse partition 12, and a corbel transverse partition 13 are provided between the hollow web plates 4 on both sides of the Y-shaped box section 2 and the outer wing plates 22 to connect and fix them.

[0026] The inner side of the box-type corbel side panel 15 is connected to the inner ring wing panel 8 through the vertical rib plate 17 and the side panel cross partition 18. An intermediate sealing plate 19 is provided between the box-type corbel side panels 15 on both sides, and the intermediate sealing plate 19 is located on the top surface of the Y-shaped box section 2. The middle plug plate 25 of the fork corbel of the fork corbel 7 is connected and fixed to the box-type corbel side panel 15 with the corbel wing panel 26. The device of the present invention adopts a sub-shaped box-type column and a Y-shaped box section connection structure, and improves the overall stability and force of the conversion node through a hollow triangular reinforcement plate, reduces the amount of steel plate and improves the appearance. Finally, it is converted through the upper steel beam system to form a new type of canopy. The steel column of the spatial structure has the advantages of large force, reasonable force transmission, stable structure, novel shape, and saving steel. The device component node types are complex, the curvature of the bend pipe is diverse, and the spatial shape is peculiar. As an exposed steel column, the external structure is beautiful.

[0027] like Figure 2-14 As shown, a construction process of a hollow Y-shaped variable-section box column includes the following steps: Step 1: Make parts of the Y-shaped box column 1, the Y-shaped box section 2, and the tree branch bracket 7; Step 2: Assemble and weld the inner ring wing plate 8 and the web plate 9. The weld between the web plate 9 and the inner ring wing plate 8 is required to be a full penetration backing plate weld of level 1. The weld between the inner ring wing plates 8 is required to be a full penetration backing plate weld of level 1. The weld excess height between the inner ring wing plate 8 and the web plate 9 of the body needs to be controlled within 2 mm. Step 3: The hollow webs 4 on both sides of the Y-shaped box section 2 body are assembled and welded with the wing plate diaphragm 10, the longitudinal rib plate 11, the rib plate diaphragm 12, and the corbel diaphragm 13. The welds between the longitudinal rib plate 11 and the inner ring wing plate 8 and the above-mentioned diaphragm are required to be full penetration pad welding of level 1. The welds between the longitudinal rib plate 11, the above-mentioned diaphragm and the hollow web 4 are required to be double-sided fillet welds according to the plate thickness t≤16mm, and partial penetration double-sided welding according to t>16mm; Step 4: Assemble and weld the I-shaped arc 14 with the inner ring wing plate 8 and the web plate 9. The butt weld between the I-shaped arc 14 and the inner ring wing plate 8 and the web plate 9 is required to be a first-level full penetration root cleaning weld. The weld between the notch of the I-shaped arc 14 and the inner ring wing plate 8 and the web plate 9 adopts an integral surfacing arc. The inner diameter of the I-shaped arc 14 requires an integrally polished arc transition, and the arc flatness tolerance is controlled to be 0~3mm; Step 5: Assemble and weld the box-type corbel side plate 15 and the diaphragm 16. The welds between the box-type corbel side plate 15 and the hollow web 4 are required to be full penetration backing plate welding level 1, and the welds between the middle diaphragm 16 are required to be full penetration backing plate welding level 1; Step 6: Assemble and weld the inner vertical ribs 17 of the box-type corbel side panels 15, the side panel diaphragm 18, and the middle cover 19. The weld of the vertical ribs 17 is required to be a three-sided single-sided fillet weld. The top of the column is tight and not welded. The weld of the side panel diaphragm 18 is required to be a full penetration four-sided pad welding. The weld of the middle cover 19 is required to be a partial penetration single-sided groove sealing weld. Step 7: Assemble and weld the brackets. The combined weld of the box-type bracket 20 is required to be a first-level full penetration backing plate weld. The weld between the box-type bracket 20 and the hollow web 4 is required to be a first-level full penetration backing plate weld. The weld of the sealing plate 29 is required to be a single-sided fillet weld. Step 8: The Y-shaped box column 1 and the Y-shaped box section 2 are butt welded, the weld between the longitudinal rib plate 11 and the connecting web plate 21 is required to be a first-grade full penetration backing plate weld, and the butt weld between the hollow web plate 4 and the Y-shaped box column 1 is required to be a first-grade full penetration backing plate weld; Step 9: The outer wing plate 22 is assembled and welded. The weld between the hollow web 4 and the outer wing plate 22 is required to be a full penetration backing plate weld of level 1. The butt weld between the outer wing plate 22 and the sub-shaped box column 1 is required to be a full penetration backing plate weld of level 1. The weld between the outer wing plate 22 and the box-shaped corbel side plate 15 is required to be a single-sided fillet weld, and the weld angle is 1.5t, where t is the thickness of the thin plate. Step 10: Assemble and weld the outer sealing plate 23 and the reinforcing partition 24. The weld of the reinforcing partition 24 is required to be a full penetration four-sided backing plate weld of level 1, and the weld of the outer sealing plate 23 is required to be a partial penetration single-sided groove weld; Step 11: Assemble and weld the middle plug plate 25 of the tree branch corbel and the corbel wing plate 26. The weld between the middle plug plate 25 of the tree branch corbel and the box-type corbel side plate 15 and the corbel wing plate 26 is required to be a first-level full penetration root clearing weld. The weld between the corbel wing plate 26 and the box-type corbel side plate 15 is required to be a first-level full penetration pad weld. Step 12: Assemble and weld the inner web 27 of the corbel. The combined weld of the inner web 27 of the corbel and the corbel wing plate 26 is required to be a first-level full penetration backing plate weld, with the groove facing the outside of the box-type corbel 20. The weld of the inner web 27 of the corbel and the middle insert plate 25 of the tree branch corbel is required to be a first-level full penetration root clearing weld, and the weld of the corbel cover plate 30 is required to be a single-sided fillet weld; Step 13: Assemble and weld the outer web 28 of the corbel. The welds between the outer web 28 of the corbel and the corbel wing plate 26 and the hollow web 4 are all required to be full penetration backing plate welding level 1; Step 14: Assemble and weld the lifting ears and connecting ear plate accessories.

[0028] In the above step 1, the outer wing plate 22 of the Y-shaped box section 2 needs to be suppressed for reverse deformation. After welding, the outer wing plate 22 needs to meet the tolerance requirements. The corbel wing plate 26 of the branch corbel 7 needs to be bent using a hydraulic press. When bending, a 6mm thin plate needs to be padded on the plate to avoid obvious indentations on the corbel flange. After the rectangular corbel is cut, the corresponding groove is opened to facilitate the subsequent assembly and welding of the corbel.

[0029] The process of the present invention clarifies the processing technology of special components and the arrangement of welding steps, has high operating efficiency, and the welding process can prevent welding cracks and reduce welding stress, thereby ensuring processing quality. In addition, the outer weld is polished accordingly according to design requirements to ensure the appearance quality of the variable-section steel column node.

[0030] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should be included in the protection scope determined by the claims of the present invention.

Claims

1. A hollow Y-shaped variable-section box-shaped column, comprising a box-shaped column, a Y-shaped box section, and a branch bracket, characterized in that: The extended end of the main axis of the Y-shaped box section is connected to the Y-shaped box column, the middle part of the Y-shaped box section is a triangular hollow, and the outer sides of the two ends of the forked extension of the Y-shaped box section are respectively connected to the branch corbels, and the branch corbels are fixed to the side panels of the box corbels.

2. A hollow Y-shaped variable-section box column according to claim 1, characterized in that: The upper and lower sides of the Y-shaped box section are covered with hollow webs, and the outer sides of the forked and extended Y-shaped box section are outer wing panels.

3. The hollow Y-shaped variable-section box-shaped column according to claim 1, characterized in that: Between the hollow webs on both sides of the middle hollow of the Y-shaped box section are V-shaped inner ring wing plates and transversely arranged webs, the webs are arranged between the two ends of the inner ring wing plates, and I-shaped arcs are arranged at the connections between the two ends of the webs and the inner ring wing plates, and the I-shaped arcs are located on the inner side of the middle hollow of the Y-shaped box section.

4. The hollow Y-shaped variable-section box-shaped column according to claim 2, characterized in that: A wing plate transverse partition, a longitudinal rib plate, a rib plate transverse partition, and a corbel transverse partition are provided between the hollow web plates on both sides of the Y-shaped box body section and the outer wing plates for connection and fixation.

5. The hollow Y-shaped variable-section box-shaped column according to claim 1, characterized in that: The inner side of the box-type corbel side plate is connected to the inner ring wing plate through a vertical rib plate and a side plate transverse partition plate. An intermediate sealing plate is provided between the box-type corbel side plates on both sides, and the intermediate sealing plate is located on the top surface of the Y-shaped box body section.

6. The hollow Y-shaped variable-section box-shaped column according to claim 1, characterized in that: The middle plug plate of the fork corbel of the fork corbel is connected and fixed to the corbel wing plate on the box-shaped corbel side plate.

7. A construction process for a hollow Y-shaped variable-section box-shaped column, characterized in that: The following steps are involved: Step 1: Make the parts of the Ya-shaped box column, Y-shaped box section, and tree branch bracket; Step 2: Assemble and weld the inner ring wing plate and the web plate. The weld between the web plate and the inner ring wing plate is required to be full penetration backing plate welding level 1. The weld between the inner ring wing plates is required to be full penetration backing plate welding level 1. The weld excess height between the inner ring wing plate and the web plate of the main body needs to be controlled within 2mm; Step 3: The hollow webs on both sides of the Y-shaped box body are assembled and welded with the wing plate diaphragms, longitudinal ribs, rib diaphragms, and corbel diaphragms. The welds between the longitudinal ribs and the inner ring wing plates and the above diaphragms are required to be full penetration pad welding of level 1. The welds between the longitudinal ribs, the above diaphragms and the hollow webs are required to be double-sided fillet welds according to the plate thickness t≤16mm, and partial penetration double-sided welds according to t>16mm; Step 4: Assemble and weld the I-shaped arc with the inner ring wing plate and the web plate. The butt weld between the I-shaped arc and the inner ring wing plate and the web plate is required to be a first-level full penetration root cleaning weld. The weld between the I-shaped arc notch and the inner ring wing plate and the web plate adopts an overall surfacing arc. The inner diameter of the I-shaped arc requires an overall polished arc transition, and the arc flatness tolerance is controlled to be 0~3mm; Step 5: Assemble and weld the box-type corbel side panels and the diaphragm. The welds between the box-type corbel side panels and the hollow webs are required to be full penetration backing plate welding level 1, and the welds between the middle diaphragm are required to be full penetration backing plate welding level 1; Step 6: Assemble and weld the inner vertical ribs of the box-type corbel side panels, the side panel diaphragms, and the middle cover. The welds of the vertical ribs are required to be three-sided single-sided fillet welds. The top of the column is tight and not welded. The welds of the side panel diaphragms are required to be full penetration four-sided pad welding, and the welds of the middle cover are required to be partial penetration single-sided groove sealing welding. Step 7: Assemble and weld the corbels. The combined weld of the box-type corbels is required to be a first-grade full penetration backing plate weld. The weld of the box-type corbels and the hollow belly plate is required to be a first-grade full penetration backing plate weld. The weld of the sealing plate is required to be a single-sided fillet weld. Step 8: The Y-shaped box column and the Y-shaped box section are butt welded. The weld between the longitudinal rib plate and the connecting web is required to be a full penetration backing plate welding of level 1. The butt weld between the hollow web and the Y-shaped box column is required to be a full penetration backing plate welding of level 1. Step 9: Assemble and weld the outer wing plate. The weld between the hollow web and the outer wing plate is required to be a full penetration pad weld of level 1. The butt weld between the outer wing plate and the sub-shaped box column is required to be a full penetration pad weld of level 1. The weld between the outer wing plate and the box-shaped corbel side plate is required to be a single-sided fillet weld with a weld angle of 1.5t, where t is the thickness of the thin plate. Step 10: Assemble and weld the outer sealing plate and the reinforcing partition. The weld of the reinforcing partition is required to be a full penetration four-sided backing plate weld of level 1, and the weld of the outer sealing plate is required to be a partial penetration single-sided groove weld; Step 11: Assemble and weld the middle plug plate and the wing plate of the tree fork corbel. The welds between the middle plug plate of the tree fork corbel and the side plate and wing plate of the box-type corbel are required to be full penetration and root clearing welding of level 1. The welds between the wing plate of the corbel and the side plate of the box-type corbel are required to be full penetration and pad welding of level 1. Step 12: Assemble and weld the inner web of the corbel. The combined weld of the inner web of the corbel and the corbel wing plate is required to be a first-grade full penetration backing plate weld. The groove faces the outside of the box-type corbel. The weld of the inner web of the corbel and the middle insert of the branch corbel is required to be a first-grade full penetration root clearing weld. The weld of the corbel sealing plate is required to be a single-sided fillet weld. Step 13: Assemble and weld the outer web of the corbel. The welds between the outer web of the corbel and the corbel wing plate and the hollow web are required to be full penetration backing plate welding of level 1; Step 14: Assemble and weld the lifting ears and connecting ear plate accessories.

8. The construction process of a hollow Y-shaped variable-section box-shaped column according to claim 7 is characterized in that: In the step 1, the outer wing plate of the Y-shaped box section needs to be suppressed for anti-deformation, and the outer wing plate needs to meet the tolerance requirements after welding. The corbel wing plate of the branch corbel needs to be bent using a hydraulic press. When bending, a 6mm thin plate needs to be padded on the plate to avoid obvious indentations on the corbel flange. After the rectangular corbel is cut, the corresponding groove is opened to facilitate the subsequent assembly and welding of the corbel.

Images