Method for manufacturing a bridge steel-concrete joint section

Abstract

A kind of bridge steel-concrete joint section manufacturing method, step S1, all parts are cut and bevelled using numerical control cutting machine;Step S2, panel unit element manufacturing is carried out: step S3, respectively, weld bottom plate unit element, inner web unit element, outer web unit element, middle crossbeam unit element, blast nozzle three-dimensional unit element, pressure plate unit element: step S4, steel-concrete joint section manufacturing is carried out.The reasonable assembly welding sequence of the present application makes each component weld joint have better welding operation space, improves welding quality and efficiency;At the same time, it is guaranteed that each component can be smoothly installed in place.

Description

Technical Field

[0001] This invention belongs to the field of bridge steel structure technology, and specifically relates to a method for manufacturing a steel-concrete composite section for bridges. Background Technology

[0002] With the continuous development of bridge construction in China, steel-concrete composite bridge structures have been widely adopted. The steel-concrete composite section serves as the transition between steel beams and concrete beams. This section typically consists of face plates, bottom plates, web plates, diaphragms, bearing plates, studs, T-rib stiffeners, and I-rib stiffeners. The structure is complex and dense; the correct assembly sequence directly affects the successful assembly. Welding space is limited, and all structural welds are full penetration welds. This leads to significant difficulties in component assembly and welding, low welding efficiency, and difficulty in controlling welding quality. Therefore, it is necessary to propose a method for fabricating steel-concrete composite sections. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for manufacturing a steel-concrete composite section of a bridge, which provides a reasonable assembly and welding sequence, ensures that the weld seams of each component have good welding operation space, improves welding quality and efficiency, and at the same time ensures that each component can be installed smoothly.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A method for fabricating a steel-concrete composite section for bridges, comprising the following steps:

[0006] Step S1: Use a CNC cutting machine to cut all parts and bevel them;

[0007] Step S2: Fabricate panel unit components: The panel unit components consist of six pieces, panel unit components M1 to M6.

[0008] Step S3: Separately assemble and weld the bottom plate unit, inner web plate unit, outer web plate unit, middle crossbeam unit, vent unit, and pressure plate unit. The bottom plate unit includes bottom plate unit D1 to bottom plate unit D6. The pressure plate unit mainly involves welding studs, using a drawn arc welding machine. The pressure plate unit includes the outer side pressure plate units of the left and right box sheds in the steel-concrete composite section and the inner side pressure plate units of the left and right box sheds in the steel-concrete composite section.

[0009] Step S4: Construct the steel-concrete composite section:

[0010] Step S4.1: Position the base plate reference unit D1 and base plate reference unit D4 on the jig. Using the bridge centerline as the reference, align with the ground line and position the adjacent base plate unit D2, base plate unit D3, base plate unit D5, and base plate unit D6 in sequence. Weld the longitudinal seam of the base plate in sequence.

[0011] Step S4.2: Position and fix the outer pressure plate unit of the left and right box girder and the first transverse diaphragm unit on the tower side of the steel-concrete composite section, and weld the bottom plate short anchor pipe component.

[0012] Step S4.3: Position and fix the second transverse diaphragm unit on the outer side of the left and right box girder and the side facing the tower of the steel-concrete composite section, and weld the long anchor pipe component of the bottom plate.

[0013] Step S4.4: Positioning and fixing the third transverse diaphragm unit on the outer side of the left and right box girder and the tower side of the steel-concrete composite section, assembling and positioning, and positioning the middle web plate;

[0014] Step S4.5: Position and fix the inner side pressure plate unit of the left and right box chambers of the steel-concrete composite section and the first transverse diaphragm unit on the tower side; weld the bottom plate short anchor pipe component and assemble the inner web plate anchor pipe component.

[0015] Step S4.6: Position and fix the second transverse diaphragm unit on the inner side of the left and right box chambers and the side facing the tower of the steel-concrete composite section, and weld the long anchor pipe component of the bottom plate.

[0016] Step S4.7: Position and fix the third transverse diaphragm unit on the inner side of the left and right box chambers and on the tower side of the steel-concrete composite section;

[0017] Step S4.8: The inner web plate unit, the corresponding partition of the middle crossbeam, and the outer web plate unit of the steel-concrete composite section are assembled and positioned in sequence, and the inner web plate is then welded to the I-rib.

[0018] Step S4.9: Sequentially weld the inner web plate, the first transverse diaphragm unit on the tower side, the second transverse diaphragm unit on the tower side, the third transverse diaphragm unit on the tower side, the corresponding diaphragm of the middle transverse beam, the inner bearing plate of the box chamber, the web plate anchor pipe component, the inner web plate, the outer web plate, the first transverse diaphragm unit, the second transverse diaphragm unit, the third transverse diaphragm unit, the outer bearing plate of the box chamber, the inner web plate, the middle web plate, the outer web plate and the bottom plate;

[0019] Step S4.10: Weld outwards sequentially, using the bridge centerline as a reference;

[0020] Step S4.11: Position and fix panel reference unit M1 and panel reference unit M6, weld the corner joints between the inner web plate and panel reference unit M6 and the outer web plate and panel reference unit M1, position adjacent panel unit M2-panel unit M5 in sequence, and weld the longitudinal seam of the panel.

[0021] Step S4.12: Weld the butt welds of the first toothed plate, the second toothed plate, and the third toothed plate on the tower side of the panel; the butt welds of the pressure plate and the pressure plate unit; the corner welds of the first toothed plate, the second toothed plate, and the third toothed plate on the tower side of the panel with the partition flange; and the corner welds of the middle box partition with the panel.

[0022] Step S4.13: Install and weld the partition plate, reinforce it, and then install the T-rib flange on the panel unit.

[0023] Step S4.14: Positioning and fixing of the middle crossbeam unit. First, weld the butt weld of the panel, then drill the holes in the web plate connecting plate and the bottom plate connecting plate. After drilling, the web plate connecting plate is derusted and aluminum sprayed, and then put back on the jig for installation of high-strength bolts.

[0024] Step S4.15: Assemble the three-dimensional unit of the air nozzle;

[0025] Step S4.16: Install auxiliary structures, local reinforcement structures, and lifting point structures;

[0026] Step S4.17: After the steel-concrete composite section is manufactured and qualified, the beam segment hoisting number and direction mark should be marked.

[0027] Step S4.18: After the bottom plate connecting plate is derusted and aluminum sprayed after drilling, high-strength bolts are installed after the anti-corrosion of the steel box girder is completed.

[0028] Preferably, the sub-step of step S2 is as follows:

[0029] Step S2.1: Separately assemble and weld the short anchor pipe component, the long anchor pipe component of the panel, the T-rib component of the panel, and the pressure plate component of the panel; the main component of the pressure plate of the panel is the welding of studs, which is carried out by a drawn arc welding machine;

[0030] Step S2.2, Positioning and Marking: Hoist the panel onto the positioning and marking platform and mark the baseline and positioning lines for each component;

[0031] Step S2.3: Weld the first toothed plate on the tower side of the panel, the second toothed plate on the tower side of the panel, the third toothed plate on the tower side of the panel → short anchor pipe component on the panel → second toothed plate on the tower side of the panel → weld the long anchor pipe component on the panel → weld the third toothed plate on the tower side of the panel → weld the T-rib component on the panel → weld the I-rib component on the panel → weld the pressure plate on the panel → weld the I-rib on the tower side of the panel. The bevels of the toothed plate and the pressure plate on the panel are all facing away from the tower side.

[0032] Step S2.4, Unit component straightening: Check the flatness of the panel unit components, use flame straightening locally, control the straightening temperature between 600℃ and 800℃, and allow natural cooling. Overheating, hammering and water cooling are strictly prohibited.

[0033] Step S2.5, Panel Unit Inspection and Marking: Hoist the panel unit onto the inspection platform and check the unit's length, width, diagonal difference, welding quality, and flatness; mark qualified unit units and transfer them to storage.

[0034] Preferably, the sub-steps of step S4.9 are as follows:

[0035] S4.9.1 Weld the inner web plate to the first transverse diaphragm unit on the tower side, the second transverse diaphragm unit on the tower side, the third transverse diaphragm unit on the tower side, the corresponding diaphragm of the middle crossbeam, and the fillet weld of the inner side bearing plate of the box.

[0036] S4.9.2 Welding the corner joint between the anchor pipe component of the inner web plate and the inner web plate;

[0037] S4.9.3, fillet welds between the outer web plate and the first transverse diaphragm unit, the second transverse diaphragm unit, the third transverse diaphragm unit, and the outer pressure plate of the box.

[0038] S4.9.4, fillet welds between the inner web, middle web, outer web and base plate.

[0039] Preferably, step 4.10 sub-step is as follows:

[0040] Step 4.10.1: First transverse diaphragm unit on the tower side, second transverse diaphragm unit on the tower side, third transverse diaphragm unit on the tower side, corresponding diaphragm and bottom plate of the middle crossbeam, first transverse diaphragm unit, second transverse diaphragm unit, third transverse diaphragm unit, corner joint between the outer bearing plate and bottom plate of the box.

[0041] Step 4.10.2: All short anchor pipe components of the base plate, corner joints of the long anchor pipe components of the base plate and the base plate.

[0042] The present invention can achieve the following beneficial effects:

[0043] 1. A reasonable assembly and welding sequence ensures that each component weld has sufficient welding operation space, improving welding quality and efficiency; at the same time, it ensures that each component can be installed smoothly.

[0044] 2. A reasonable welding sequence reduces welding deformation and the amount of correction work. Attached Figure Description

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0046] Figure 1 This is a top view of the steel-concrete composite section panel unit of the bridge according to the present invention.

[0047] Figure 2 This is a cross-sectional view of the AA panel unit of the steel-concrete composite section of the bridge according to the present invention;

[0048] Figure 3 This is a cross-sectional view of the BB panel unit of the steel-concrete composite section of the bridge according to the present invention;

[0049] Figure 4 This is a cross-sectional view (CC) of the steel-concrete composite panel unit of the bridge according to the present invention.

[0050] Figure 5 This is a DD cross-sectional view of the bridge steel-concrete composite section panel unit of the present invention;

[0051] Figure 6 This is a cross-sectional view of the MM section panel unit of the steel-concrete composite section of the bridge according to the present invention;

[0052] Figure 7 This is a cross-sectional view of the NN section panel unit of the steel-concrete composite section of the bridge according to the present invention;

[0053] Figure 8 This is a cross-sectional view of the EE panel unit of the steel-concrete composite section of the bridge according to the present invention;

[0054] Figure 9 This is a cross-sectional view of the FF panel unit of the steel-concrete composite section of the bridge according to the present invention;

[0055] Figure 10 This is a cross-sectional view of the bridge steel-concrete composite section panel unit GG of the present invention;

[0056] Figure 11 This is an unfolded view of the steel-concrete composite section panel of the bridge according to the present invention;

[0057] Figure 12 This is a development view of the bottom plate of the steel-concrete composite section of the bridge according to the present invention;

[0058] Figure 13 This is a cross-sectional view (left side) of the steel-concrete composite section AA of the bridge of the present invention.

[0059] Figure 14 This is a cross-sectional view (right side) of the steel-concrete composite section AA of the bridge of the present invention.

[0060] Figure 15 This is a cross-sectional view (left side) of the steel-concrete composite section BB of the bridge of the present invention.

[0061] Figure 16 This is a cross-sectional view (right side) of the steel-concrete composite section BB of the bridge of the present invention.

[0062] Figure 17 This is a detailed drawing (F-shaped) of the steel-concrete composite section of the bridge in this invention.

[0063] Figure 18 This is a cross-sectional view (left) of the steel-concrete composite section of the bridge according to the present invention.

[0064] Figure 19 This is a cross-sectional view (right side) of the steel-concrete composite section of the bridge according to the present invention.

[0065] Figure 20 This is a cross-sectional view of the steel-concrete composite section EE of the bridge according to the present invention;

[0066] Figure 21 This is a cross-sectional view (right side) of the steel-concrete composite section of the bridge according to the present invention.

[0067] Figure 22 This is a cross-sectional view (right side) of the steel-concrete composite section of the bridge according to the present invention.

[0068] In the diagram: 1. External bearing plate unit on the left and right sides of the steel-concrete composite section; 2. First transverse diaphragm unit on the tower side; 3. Short anchor pipe component on the bottom plate; 4. Second transverse diaphragm unit on the tower side; 5. Long anchor pipe component on the bottom plate; 6. Third transverse diaphragm unit on the tower side; 7. Middle web plate; 8. Internal bearing plate unit on the left and right sides of the steel-concrete composite section; 9. First transverse diaphragm unit on the tower side; 10. Anchor pipe component on the inner web plate; 11. Second transverse diaphragm unit on the tower side; 12. Third transverse diaphragm unit on the tower side; 13. Inner web plate unit; 14. Rib I; 15. Divider. 16. Plate-embedded stiffening component; 17. Middle crossbeam unit; 18. Panel; 19. First toothed plate of panel; 20. Short anchor tube component of panel; 21. Second toothed plate of panel facing the tower; 22. Welded long anchor tube component of panel; 23. Welded third toothed plate of panel facing the tower; 24. Welded T-rib component of panel; 25. Welded I-rib component of panel; 26. Welded bearing plate of panel; 27. Welded I-rib of panel facing the tower; 28. Three-dimensional unit of vent; 29. ​​Corresponding partition of middle crossbeam; 30. Web plate connecting plate; 31. Bottom plate connecting plate; 32. Partition flange; 33. T-rib flange; 34. Stud. Detailed Implementation

[0069] Preferred solutions include Figures 1 to 22 As shown, a method for fabricating a steel-concrete composite section for bridges includes the following steps:

[0070] 1. Cutting: Use a CNC cutting machine to cut all parts and bevel them.

[0071] 2. Fabrication of panel unit components (M1-M6):

[0072] ① Weld the short anchor pipe component 20, the long anchor pipe component 22, the T-rib component 24, and the pressure plate component 26 of the panel respectively. The pressure plate component 26 of the panel mainly consists of the welding of the studs 34, which is carried out using a drawn arc welding machine.

[0073] ② Positioning and marking: Hang panel 18 on the positioning and marking platform and mark the baseline and positioning lines of each component.

[0074] ③ Welding the first toothed plate 19 of the panel → panel short anchor pipe component 20 → panel second toothed plate 21 facing the tower 21 → welding the long anchor pipe component 22 → welding the third toothed plate 23 facing the tower 23 → welding the panel T-rib component 24 → welding the panel I-rib component 25 → welding the panel bearing plate 26 → welding the panel I-rib facing the tower 27. The bevels of the toothed plate and the panel bearing plate are all facing away from the tower side.

[0075] ④ Unit component straightening: Check the flatness of the panel unit components, use flame straightening for local areas, control the straightening temperature at 600℃~800℃, and allow natural cooling. Overheating, hammering and water cooling are strictly prohibited.

[0076] ⑤ Panel Unit Inspection and Marking: Hoist the panel units onto the inspection platform and check their length, width, diagonal difference, welding quality, and flatness. Qualified units are marked and then stored.

[0077] 3. Weld the base plate unit (D1-D6), inner web plate unit 13, outer web plate unit 14, middle crossbeam unit 17, air nozzle three-dimensional unit 28, and pressure plate unit respectively: The pressure plate unit mainly involves the welding of studs 34, which is carried out using an arc welding machine.

[0078] 4. Fabrication of the steel-concrete composite section:

[0079] ① Position the base plate reference unit (D1, D4) on the jig, take the bridge center line as the reference, align with the ground line, and position the adjacent base plate unit (D2, D3, D5, D6) in sequence, and weld the longitudinal seam of the base plate in sequence.

[0080] ② Position and fix the outer pressure plate unit 1 of the left and right box girder exterior of the steel-concrete composite section and the first transverse diaphragm unit 2 on the tower side, and weld the bottom plate short anchor pipe component 3.

[0081] ③ Position and fix the second transverse diaphragm unit 4 on the outer side of the left and right box girder and the side facing the tower of the steel-concrete composite section, and weld the bottom plate long anchor pipe component 5.

[0082] ④ Positioning and fixing of the third transverse diaphragm unit 6 on the outer side of the left and right box girder and the tower side of the steel-concrete composite section, and positioning of the middle web plate 7.

[0083] ⑤ Position and fix the inner side pressure plate unit 8 of the left and right box chambers of the steel-concrete composite section and the first transverse diaphragm unit 9 on the tower side, weld the bottom plate short anchor pipe component 3, and assemble the inner web plate anchor pipe component 10.

[0084] ⑥ Position and fix the second transverse diaphragm unit 11 on the inner side of the left and right box chambers and the side facing the tower of the steel-concrete composite section, and weld the bottom plate long anchor pipe component 5.

[0085] ⑦ Position and fix the third transverse diaphragm unit 12 on the inner side of the left and right box chambers and the side facing the tower of the steel-concrete composite section.

[0086] ⑧ The inner web plate unit 13, the corresponding partition plate 30 of the middle crossbeam, and the outer web plate unit 14 of the steel-concrete composite section are assembled and positioned in sequence, and the inner web plate is then fitted with I rib 15 and welded to the inner web plate.

[0087] 9. Weld in sequence

[0088] a. Welded inner web plate to the first transverse diaphragm unit 9 on the tower side, the second transverse diaphragm unit 11 on the tower side, the third transverse diaphragm unit 12 on the tower side, the corresponding diaphragm 29 of the middle transverse beam, and the corner weld of the inner side bearing plate 8 of the box.

[0089] b. Weld the inner web anchor pipe component 10 to the corner joint of the inner web.

[0090] c. The fillet welds of the outer web plate to the first transverse diaphragm unit 2, the second transverse diaphragm unit 4, the third transverse diaphragm unit 6, and the outer pressure plate 1 of the box.

[0091] d. Fillet welds between the inner web, middle web, outer web, and bottom plate.

[0092] ⑩ Weld outwards sequentially, using the bridge's centerline as a reference.

[0093] a. First transverse diaphragm unit 9 on the tower side, second transverse diaphragm unit 11 on the tower side, third transverse diaphragm unit 12 on the tower side, diaphragm 29 corresponding to the middle transverse beam and the bottom plate, first transverse diaphragm unit 2, second transverse diaphragm unit 4, third transverse diaphragm unit 6, corner joint between the outer bearing plate 1 of the box and the bottom plate.

[0094] b. Corner joints between all short anchor pipe components 3 and long anchor pipe components 5 of the base plate and the base plate.

[0095] ⑪ Position and fix the panel reference unit (M1, M6), weld the corner joints between the inner web plate and the panel reference unit (M6), and between the outer web plate and the panel reference unit (M1), position the adjacent panel unit (M2-M5) in sequence, and weld the longitudinal seam of the panel.

[0096] ⑫ Butt welds of the first toothed plate 19, the second toothed plate 21, and the third toothed plate 23 on the tower side of the panel; butt welds of the pressure plate 26 on the panel and the pressure plate unit; corner welds of the first toothed plate 19, the second toothed plate 21, and the third toothed plate 23 on the tower side of the panel and the partition flange 32; and corner welds of the middle box partition and the panel.

[0097] ⑬ Welding and reinforcement of partition plates 16, panel unit rear T-rib flange 33.

[0098] ⑭ Position and fix the middle crossbeam unit 17. First, weld the butt joint of the panel. Then, drill holes in the web plate connecting plate 30 and the bottom plate connecting plate 31. After drilling, the web plate connecting plate 30 is derusted and aluminum sprayed. Then, it is put back on the jig and high-strength bolts are installed.

[0099] ⑮ Assemble the three-dimensional unit component 28 for the air nozzle.

[0100] ⑯ Install auxiliary structures, local reinforcement structures, and lifting point structures, etc.

[0101] ⑰ After the steel-concrete composite section is manufactured and qualified, the beam section hoisting number and direction mark should be marked.

[0102] ⑱ After the bottom plate connecting plate 31, which has been drilled, is derusted and sprayed with aluminum, high-strength bolts will be installed after the anti-corrosion treatment of the steel box girder is completed.

[0103] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for manufacturing a steel-concrete composite section for bridges, characterized in that... Includes the following steps: Step S1: Use a CNC cutting machine to cut all parts and bevel them; Step S2: Fabricate the panel unit components: Step S3: Separately assemble and weld the bottom plate unit, inner web plate unit, outer web plate unit, middle crossbeam unit, air nozzle three-dimensional unit, and pressure plate unit: wherein the pressure plate unit includes the outer side pressure plate unit of the left and right box sections of the steel-concrete composite section and the inner side pressure plate unit of the left and right box sections of the steel-concrete composite section; Step S4: Construct the steel-concrete composite section: Step S4.1: Position the base plate reference unit D1 and base plate reference unit D4 on the jig. Using the bridge centerline as the reference, align with the ground line and position the adjacent base plate unit D2, base plate unit D3, base plate unit D5, and base plate unit D6 in sequence. Weld the longitudinal seam of the base plate in sequence. Step S4.2: Position and fix the outer pressure plate unit of the left and right box girder and the first transverse diaphragm unit on the tower side of the steel-concrete composite section, and weld the bottom plate short anchor pipe component. Step S4.3: Position and fix the second transverse diaphragm unit on the outer side of the left and right box girder and the side facing the tower of the steel-concrete composite section, and weld the long anchor pipe component of the bottom plate. Step S4.4: Positioning and fixing the third transverse diaphragm unit on the outer side of the left and right box girder and the tower side of the steel-concrete composite section, assembling and positioning, and positioning the middle web plate; Step S4.5: Position and fix the inner side pressure plate unit of the left and right box chambers of the steel-concrete composite section and the first transverse diaphragm unit on the tower side; weld the bottom plate short anchor pipe component and assemble the inner web plate anchor pipe component. Step S4.6: Position and fix the second transverse diaphragm unit on the inner side of the left and right box chambers and the side facing the tower of the steel-concrete composite section, and weld the long anchor pipe component of the bottom plate. Step S4.7: Position and fix the third transverse diaphragm unit on the inner side of the left and right box chambers and on the tower side of the steel-concrete composite section; Step S4.8: The inner web plate unit, the corresponding partition of the middle crossbeam, and the outer web plate unit of the steel-concrete composite section are assembled and positioned in sequence, and the inner web plate is then welded to the I-rib. Step S4.9: Sequentially weld the inner web plate, the first transverse diaphragm unit on the tower side, the second transverse diaphragm unit on the tower side, the third transverse diaphragm unit on the tower side, the corresponding diaphragm of the middle transverse beam, the inner bearing plate of the box chamber, the web plate anchor pipe component, the inner web plate, the outer web plate, the first transverse diaphragm unit, the second transverse diaphragm unit, the third transverse diaphragm unit, the outer bearing plate of the box chamber, the inner web plate, the middle web plate, the outer web plate and the bottom plate; Step S4.10: Weld outwards sequentially, using the bridge centerline as a reference; Step S4.11: Position and fix panel reference unit M1 and panel reference unit M6, weld the corner joints between the inner web plate and panel reference unit M6 and the outer web plate and panel reference unit M1, position adjacent panel unit M2-panel unit M5 in sequence, and weld the longitudinal seam of the panel. Step S4.12: Weld the butt welds of the first toothed plate, the second toothed plate, and the third toothed plate on the tower side of the panel; weld the butt welds of the pressure plate and the pressure plate unit; weld the corner joints of the first toothed plate, the second toothed plate, and the third toothed plate on the tower side of the panel with the partition flange; and weld the corner joints of the middle box partition with the panel. Step S4.13: Install and weld the partition plate, reinforce it, and then install the T-rib flange on the panel unit. Step S4.14: Positioning and fixing of the middle crossbeam unit. First, weld the butt weld of the panel, then drill the holes in the web plate connecting plate and the bottom plate connecting plate. After drilling, the web plate connecting plate is derusted and aluminum sprayed, and then put back on the jig for installation of high-strength bolts. Step S4.15: Assemble the three-dimensional unit of the air nozzle; Step S4.16: Install auxiliary structures, local reinforcement structures, and lifting point structures; Step S4.17: After the steel-concrete composite section is manufactured and qualified, the beam segment hoisting number and direction mark should be marked. Step S4.18: After the bottom plate connecting plate is derusted and aluminum sprayed after drilling, high-strength bolts are installed after the anti-corrosion of the steel box girder is completed.

2. The method for manufacturing a steel-concrete composite section for bridges according to claim 1, characterized in that: The sub-steps of step S2 are: Step S2.1: Separately weld the short anchor pipe component, the long anchor pipe component of the panel, the T-rib component of the panel, and the pressure plate component of the panel; Step S2.2, Positioning and Marking: Hoist the panel onto the positioning and marking platform and mark the baseline and positioning lines for each component; Step S2.3: Weld the first toothed plate on the tower side of the panel, the second toothed plate on the tower side of the panel, the third toothed plate on the tower side of the panel → short anchor pipe component on the panel → second toothed plate on the tower side of the panel → weld the long anchor pipe component on the panel → weld the third toothed plate on the tower side of the panel → weld the T-rib component on the panel → weld the I-rib component on the panel → weld the pressure plate on the panel → weld the I-rib on the tower side of the panel. The bevels of the toothed plate and the pressure plate on the panel are all facing away from the tower side. Step S2.4, Unit component straightening: Check the flatness of the panel unit components, use flame straightening locally, control the straightening temperature between 600℃ and 800℃, and allow natural cooling. Overheating, hammering and water cooling are strictly prohibited. Step S2.5, Panel Unit Inspection and Marking: Hoist the panel unit onto the inspection platform and check the unit's length, width, diagonal difference, welding quality, and flatness; mark qualified unit units and transfer them to storage.

3. The method for manufacturing a steel-concrete composite section for bridges according to claim 1, characterized in that: The sub-steps of step S4.9 are as follows: S4.9.1 Weld the inner web plate to the first transverse diaphragm unit on the tower side, the second transverse diaphragm unit on the tower side, the third transverse diaphragm unit on the tower side, the corresponding diaphragm of the middle crossbeam, and the fillet weld of the inner side bearing plate of the box. S4.9.2 Welding the corner joint between the anchor pipe component of the inner web plate and the inner web plate; S4.9.3, fillet welds between the outer web plate and the first transverse diaphragm unit, the second transverse diaphragm unit, the third transverse diaphragm unit, and the outer pressure plate of the box. S4.9.4, fillet welds between the inner web, middle web, outer web and base plate.

4. The method for manufacturing a steel-concrete composite section for bridges according to claim 1, characterized in that: Step 4.10 sub-steps are as follows: Step 4.10.1: First transverse diaphragm unit on the tower side, second transverse diaphragm unit on the tower side, third transverse diaphragm unit on the tower side, corresponding diaphragm and bottom plate of the middle crossbeam, first transverse diaphragm unit, second transverse diaphragm unit, third transverse diaphragm unit, corner joint between the outer bearing plate and bottom plate of the box. Step 4.10.2: All short anchor pipe components of the base plate, corner joints of the long anchor pipe components of the base plate and the base plate.

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