A method for manufacturing the arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation

Abstract

The present invention discloses a method for manufacturing an arch-beam junction section of an ultra-large cross-section steel box arch bridge suitable for water transportation, including a manufacturing process for an ultra-large arch foot steel tie beam member of a parallelogram structure and an ultra-large arch foot steel arch rib member of an octagonal structure, as well as a process for controlling the assembly size and linear shape of the overall spatial structure of the arch foot steel tie beam and the arch foot steel arch rib. The parallelogram box-shaped arch foot steel tie beam and the octagonal arch foot arch rib are all manufactured as a whole, and the arch foot arch rib and the arch foot tie beam are connected by welding. In view of the complex structural characteristics of the octagonal arch foot arch rib and the parallelogram irregular arch foot tie beam of the arch-beam junction section of the steel box arch bridge, the present invention adopts a method of first manufacturing plate units and then assembling the box body, controlling the welding size of each plate unit, which is conducive to controlling the subsequent welding deformation and overall size of the box body; adopts a method of overall horizontal pre-assembly and welding matching parts to achieve the purpose of controlling the spatial relationship between the arch foot arch rib and the tie beam.

Description

Technical Field

[0001] The invention relates to a method for manufacturing an arch bridge arch-beam joint section, in particular to a method for manufacturing an arch bridge arch-beam joint section of a super-large cross-section steel box arch bridge suitable for waterway transportation. Background Art

[0002] Currently, the existing technologies for steel box arch bridges are mostly on-site erection and installation, and there is no technology for the arch-beam junction section. At the same time, the arch ribs and tie beams of the arch-beam junction section of previous steel box arch bridges are mostly regular rectangular structures, and the box body is relatively small. They can be manufactured by assembling the top, bottom and web units of the box-type truss members of the truss bridge and welding them together, so factory manufacturing is relatively simple. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to propose a method for manufacturing the arch-beam joint section of an ultra-large cross-section steel box arch bridge suitable for water transportation, which is suitable for integral production and convenient for water transportation.

[0004] Technical solution: The present invention comprises the following steps:

[0005] The production of arch tie beams includes:

[0006] On the assembly frame, first lay the outer web unit, then assemble the partition unit and the top plate unit in sequence, control the assembly position, size, verticality or angle of the partition unit, and control the position, size and parallelogram angle of the top plate unit and the web unit;

[0007] After assembly, weld the fillet welds between the partition unit, the bottom plate unit and the top plate unit;

[0008] According to the arch rib reinforcement plate assembly position line marked in advance on the top plate unit, assemble and weld the fillet welds between the arch rib reinforcement plate unit and the top plate unit, the outer web unit and the diaphragm unit, and weld the fillet welds between the diaphragm and the top plate unit, taking the diaphragm and the outer web unit as the reference;

[0009] Assemble the inner web unit and the bottom plate unit in sequence to ensure the overall assembly size of the parallelogram box, ensure the overall assembly size of the partition and the arch rib reinforcement plate at the assembly position corresponding to the arch rib, and weld the fillet welds between the partition and the top plate unit and the bottom plate unit in sequence, and weld the fillet welds between the arch rib reinforcement plate unit and the inner web unit and the bottom plate unit;

[0010] Finally, assemble the crossbeam joint plate and weld the fillet welds between it and the inner web element;

[0011] Assemble welded bearing stiffeners and bearing pads;

[0012] Assemble and weld the support pads on the outside of the base plate unit;

[0013] Arch foot and arch rib manufacturing, specifically including:

[0014] On the assembly tire frame, one side web plate unit and one side upper and lower corner plate units are laid and positioned. The tire frame support plate is set according to the outer dimensions of the laid plate unit to control the angle and outer dimensions of the upper and lower corner plate units.

[0015] Assemble the partition unit and control the position, size and assembly angle;

[0016] Lateral positioning and assembly of top plate unit and bottom plate unit;

[0017] Assemble the upper and lower corner arc plate units on the other side and adjust the box opening size;

[0018] Assemble the web unit on the other side;

[0019] Finally, assemble and weld the foot stiffeners;

[0020] The arch foot arch ribs and arch foot tie beams are pre-assembled in a horizontal pre-assembly manner. The steel arch rib reinforcement plate assembly position line of the steel tie beam is marked in advance on the outside of the steel tie beam top plate unit box according to the plate unit stage, and the steel arch ribs are aligned with the arch rib reinforcement plate in the steel tie beam box to ensure that the plate parts of the octagonal section of the arch rib are aligned with the arch rib reinforcement plate in the steel tie beam box, while ensuring the spatial position, size and angle of the arch foot tie beam and arch ribs.

[0021] The arch foot tie beam includes a top plate, a web plate, a bottom plate, a partition plate, a longitudinal stiffening plate, a cross beam joint plate, a support stiffening plate, a support pad and an arch rib reinforcement plate.

[0022] The top plate unit is marked with arch rib reinforcement plate assembly position lines on both sides of the stiffened side and the non-stiffened side.

[0023] The partition unit includes a partition, a stiffener, and a manhole reinforcement plate, which are welded together on an assembly platform to form the partition unit.

[0024] The assembly and welding sequence of the support stiffener is as follows: first assemble the first support stiffener, then weld the fillet welds between it and the partition unit and the bottom plate unit, then assemble the second support stiffener, weld the fillet welds between it and the first support stiffener, the bottom plate unit, and the inner and outer web units, assemble and weld the fillet welds between the third support stiffener and the second support stiffener and the bottom plate unit, and finally assemble and weld the fourth support stiffener.

[0025] The overall flatness of the support plate is no more than 1 mm.

[0026] The arch foot and arch ribs include a top plate, a web plate, a bottom plate, an arc plate, a partition plate, a longitudinal stiffening plate, and a foot stiffening plate.

[0027] The longitudinal reinforcements of the upper and lower corner arc plate units are provided with patching sections at the partitions.

[0028] The assembly of the web plate unit on the other side specifically includes: welding the fillet welds inside the box between the upper and lower corner arc plate units and the top plate unit and the bottom plate unit, welding the butt welds inside the box between the upper and lower corner arc plate units and the web plate unit on one side, welding the fillet welds inside the box between the partition unit and the top plate unit, the bottom plate unit and the web plate unit, welding the fillet weld on one side outside the box between the lower corner arc plate unit and the bottom plate unit, welding the butt welds outside the box between the web plate unit on the other side and the upper and lower corner arc plate units, and welding the fillet weld outside the box between the top plate unit and the upper corner arc plate unit.

[0029] The arch foot arch rib and the arch foot tie beam are connected by welding.

[0030] Beneficial effects: The present invention combines the complex structural characteristics of the octagonal arch foot and arch ribs and the parallelogram irregular arch foot tie beams of the arch-beam joint section of the steel box arch bridge, and adopts the method of first making plate units and then assembling the box body, controlling the welding size of each plate unit, which is beneficial to controlling the subsequent welding deformation and overall size of the box body. During the overall assembly of the arch foot tie beam, the plate unit stage is used to mark the organizational position line of the arch rib reinforcement plate, and the assembly position of the arch rib reinforcement plate is strictly controlled according to the line assembly during the box assembly process to ensure accurate alignment with the eight sides of the octagonal arch rib, so as to meet the force requirements after the overall welding of the arch foot, arch ribs and arch foot tie beams; a reasonable assembly sequence is adopted to ensure the size of the box body after assembly and the assembly accuracy of the confined space support reinforcement; the method of overall machining after welding is adopted to ensure the overall flatness of the support pad, so as to meet the precision requirements of the support pad and the close fit between the support pad and the support during the installation on site. During the overall assembly of the arch foot and arch ribs, a rational assembly method and welding sequence and method after the overall box assembly were adopted, taking into account the overlap relationship between the welded edges of the partition units and the eight-deformation plate components, as well as the welding operation requirements. This ensured the assembly accuracy and welding quality of the arch ribs. The overall horizontal pre-assembly method and the welding of matching parts were adopted to achieve the goal of controlling the spatial relationship between the arch foot and arch ribs and the tie beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the overall structure of the arch foot tie beam of the present invention;

[0033] Figure 3 This is a schematic diagram of the internal structure of the arch foot tie beam of the present invention;

[0034] Figure 4 This is a bottom schematic diagram of the arch foot tie beam of the present invention;

[0035] Figure 5 This is a schematic diagram of the overall structure of the arch foot and arch ribs of the present invention;

[0036] Figure 6Schematic diagram of the top plate unit of the arch foot tie beam of the present invention;

[0037] Figure 7 Schematic diagram of the bottom plate unit of the arch foot tie beam of the present invention;

[0038] Figure 8 Schematic diagram of the web plate unit of the abutment tie beam of the present invention;

[0039] Figure 9 Schematic diagram of the fillet weld between the diaphragm and the top plate unit;

[0040] Figure 10 Schematic diagram of the fillet weld between the crossbeam joint plate and the inner web element;

[0041] Figure 11 This is a schematic diagram of the support reinforcement assembly;

[0042] Figure 12 The diagram is a schematic diagram of the base plate and foot arc plate of the arch foot and arch rib;

[0043] Figure 13 This is a schematic diagram of the assembly of the diaphragm unit for the arch foot and arch rib;

[0044] Figure 14 This is a schematic diagram of the assembly of the top and bottom plate units of the arch foot and arch ribs;

[0045] Figure 15 This is a schematic diagram of the assembly of the upper and lower corner arc plate units of the arch foot and arch rib;

[0046] Figure 16 This is a schematic diagram of the assembly of the arch foot and arch rib web unit;

[0047] Figure 17 Schematic diagram of the welding of arch foot and arch rib welds. DETAILED DESCRIPTION

[0048] The present invention will be further described below with reference to the accompanying drawings.

[0049] like Figure 1 As shown, the arch-beam junction section of the steel box arch bridge of the present invention comprises two major components: an arch foot rib 1 and an arch foot tie beam 2. The arch foot rib 1 is inclined 16° inward from the vertical plane and has an octagonal box-shaped structure; the arch foot tie beam 2 has a parallelogram-shaped box-shaped structure. The arch foot tie beam 2 and the arch foot rib 1 are connected by welding.

[0050] like Figures 2 to 4As shown, the arch foot tie beam 2 adopts a parallelogram-shaped box structure, including a first top plate 21, a first web plate, a first bottom plate 23, a first partition plate 24, a first longitudinal stiffener plate 25, a crossbeam joint plate 26, a support stiffener plate, a support pad plate 29, and an arch rib reinforcement plate 27 corresponding to the octagonal outline of the arch foot arch rib 1. The arch foot tie beam 2 has a variable height structure, with overall dimensions of 3.5 to 5.1 meters high, 4.7 meters wide, and 18.7 meters long. The warehouse is densely packed with partitions, longitudinal stiffeners, arch rib reinforcement plates, support stiffeners, and other steel components. The warehouse is densely packed with full penetration welds or partial penetration welds, resulting in an extremely complex structure and extremely difficult control of structural dimensions and welding deformation.

[0051] like Figure 5 As shown, the arch foot and arch rib 1 is an octagonal box-shaped structure with a spatial arc surface, including a second top plate 11, a second web plate 12, a second bottom plate 13, an arc plate, a second partition plate 15, a second longitudinal stiffener 16, and a foot stiffener 17. With a cross-sectional height of 5.8m, a width of 3m, and a length of 18.4m, these oversized members present significant challenges in controlling their overall dimensions and linear shape.

[0052] The invention provides a method for manufacturing an arch-beam joint section of an ultra-large cross-section steel box arch bridge, comprising a method for manufacturing an ultra-large arch foot steel tie beam member with a parallelogram structure and an ultra-large arch foot steel arch rib member with an octagonal structure, as well as a method for controlling the assembly size and linear shape of the overall spatial structure of the arch foot steel tie beam and the arch foot steel arch rib.

[0053] The manufacturing method of the arch-beam joint section of this embodiment is suitable for large-scale water transportation. The parallelogram box-shaped arch foot steel tie beam and the octagonal arch foot arch rib are manufactured integrally. Specifically, the following steps are included:

[0054] S1. Fabrication of arch foot steel tie beams

[0055] S11. Parts production: The top plate, web plate, bottom plate, partition plate, longitudinal stiffener plate, beam joint plate, support stiffener plate, support pad plate and arch rib reinforcement plate of the arch foot steel tie beam are cut by CNC or laser to control the cutting size, and the welding bevel is flame cut or machined.

[0056] S12, such as Figures 6 to 11 As shown, the plate element is fabricated: the top plate element 3, bottom plate element 8, and web plate element are each composed of a face plate and longitudinal stiffeners. After assembly on a dedicated jig, the arch rib reinforcement plate assembly position line m is marked on each of the top plate element 3 and bottom plate element 8. This serves as the assembly reference for the arch rib reinforcement plate during subsequent segment assembly. The arch rib reinforcement plate assembly position line m is marked on both the stiffened and non-stiffened sides of the top plate element 3.

[0057] The partition unit 4 is composed of a partition, a stiffener, and a manhole reinforcement plate, which are welded together on a special assembly platform to form a partition unit.

[0058] S13. Arch foot steel tie beam manufacturing:

[0059] 1) On the assembly jig, first lay the outer web plate unit 6, then sequentially assemble the diaphragm plate unit 4 and the top plate unit 3. Control the assembly position, dimensions, and verticality or angle of the diaphragm plate unit 4, and the position, dimensions, and parallelogram angle of the top plate unit 3 and the web plate unit.

[0060] 2) After assembly, the fillet welds between the partition unit 4, the bottom plate unit 8 and the top plate unit 3 are welded.

[0061] 3) Following the arch rib reinforcement plate assembly position line m marked in advance on the roof element 3, assemble and weld the fillet welds between the arch rib reinforcement plate unit 5 and the roof element 3, and between the outer web unit 6 and the diaphragm unit 4, using the diaphragm and outer web units as a reference. Weld the fillet welds between the diaphragm and roof elements.

[0062] 4) Sequentially assemble the inner web units 9 and bottom plate units 8 to ensure the overall assembly dimensions of the parallelogram box, as well as the overall assembly dimensions of the partitions and arch rib reinforcement plates at the corresponding assembly positions with the arch ribs. Enter the box through the partition manhole and sequentially weld the fillet welds between the partitions and the top and bottom plate units, and weld the fillet welds between the arch rib reinforcement plates and the inner web units and bottom plate units.

[0063] 5) Finally, assemble the crossbeam joint plate and weld the fillet welds between it and the inner web unit.

[0064] 6) Assemble and weld the support stiffeners and support pads, where the fillet welds between the support stiffeners in the box and the bottom plate, partition and inner and outer web units are full penetration or partial penetration welds, and the welding quality requirements are high. However, they are affected by the welding space, so the assembly and welding are carried out in a sequence from the inside to the outside. First, assemble the first support stiffener 281, and weld its fillet welds with the partition unit and the bottom plate unit after ensuring the size. Perform non-destructive testing after welding, and then assemble the second support stiffener 282, and weld its fillet welds with the first support stiffener 281, the bottom plate unit, the inner and outer web units. Perform non-destructive testing after welding. After meeting the requirements, assemble and weld the third support stiffener 283 and the fillet welds between the second support stiffener 282 and the bottom plate unit according to the above method. After the non-destructive testing meets the requirements, finally assemble and weld the fourth support stiffener 284. During the process, ensure the assembly size and welding quality, and control the welding deformation.

[0065] 7) Assemble and weld the support pad 29 on the outside of the base plate unit. To ensure the close fit between the arch foot steel tie beam and the support during installation, after welding and trimming the welding deformation, the support pad is milled as a whole to ensure that the overall flatness is not greater than 1mm.

[0066] S2. Arch foot steel arch rib production:

[0067] S21. Parts production: The arch foot steel arch rib top plate, web plate, bottom plate, arc plate, partition plate, longitudinal stiffener plate and foot stiffener plate are cut by CNC or laser to control the cutting size, and the welding bevel is flame cut or machined.

[0068] S22. Plate Unit Fabrication: The top plate unit, bottom plate unit, web plate unit, and upper and lower corner plate units are each composed of face plates and longitudinal stiffeners. On a dedicated cradle, the longitudinal stiffeners are assembled with the face plates and then welded to form the top, bottom plate unit, web plate unit, and corner plate unit. The bulkhead unit is composed of bulkheads, stiffeners, and manhole reinforcement plates, which are welded together on a dedicated assembly platform.

[0069] S23, Arch foot steel arch rib manufacturing, such as Figures 12 to 17 As shown:

[0070] 1) On the assembly frame, one side web unit and one side upper and lower corner arc plate units are laid and positioned. The frame support plate is set according to the outer dimensions of the laid plate unit, focusing on controlling the angles and outer dimensions of the upper corner arc plate unit 141 and the lower corner arc plate unit 142. The longitudinal reinforcement of the upper and lower corner arc plate units is provided with an embedded section 18 at the partition to avoid interference between the partition reinforcement groove and the longitudinal reinforcement during the assembly of the partition unit.

[0071] 2) Assemble the partition unit and control the position, size and assembly angle.

[0072] 3) Lateral positioning and assembly of top plate unit and bottom plate unit.

[0073] 4) Assemble the upper and lower corner arc plate units on the other side and adjust the box opening size.

[0074] 5) Assemble the web unit on the other side. After the overall box opening size meets the requirements, weld the inner fillet welds ① between the upper and lower corner arc plate units and the top plate unit and bottom plate unit on the inside of the box, the butt welds ② between the upper and lower corner arc plate units and one side of the web unit, the fillet welds ③ between the inner partition unit and the top plate unit, bottom plate unit and web unit, weld the outer fillet welds ④ between the lower corner arc plate unit and the bottom plate unit, weld the outer butt welds ⑤ between the other side of the web unit and the upper and lower corner arc plate units, weld the outer fillet welds ⑥ between the top plate unit and the upper corner arc plate unit, and ensure that the welding is as horizontal as possible to avoid upward welding;

[0075] Turn over 180 degrees so that the upper web unit faces downward, weld the fillet welds inside the box between the upper and lower corner arc plate units and the top plate unit and bottom plate unit ①, the butt welds inside the box between the upper and lower corner arc plate units and the web unit on the other side ②, the fillet welds between the partition unit inside the box and the web unit on the other side ③, weld the fillet weld on the other side outside the box between the lower corner arc plate unit and the bottom plate unit ④, weld the butt welds outside the box between the web unit on the other side and the upper and lower corner arc plate units ⑤, weld the fillet weld on the other side of the box between the top plate unit and the upper corner arc plate unit ⑥, ensure that the welding is as horizontal as possible, avoid upward welding, and complete the welding of the entire arch rib weld.

[0076] 6) Finally, assemble and weld the foot stiffeners to complete the arch foot and arch rib production of the arch-beam junction section.

[0077] 7) Use the horizontal pre-assembly method to pre-assemble the arch foot steel arch ribs and steel tie beams. According to the plate unit stage, the steel tie beam arch rib reinforcement plate assembly position line marked on the outside of the steel tie beam top plate unit box is aligned with the steel arch ribs to ensure that the octagonal section of the arch ribs is aligned with the arch rib reinforcement plate in the steel tie beam box to ensure overall force. At the same time, the spatial position, size and angle of the arch foot steel tie beam and steel arch ribs are guaranteed. After meeting the requirements, temporary reset matching parts are welded to facilitate rapid reset connection and positioning during installation on site.

Claims

1. A method for manufacturing an arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation, characterized in that: The following steps are involved: The production of arch tie beams includes: On the assembly frame, first lay the outer web unit, then assemble the partition unit and the top plate unit in sequence, control the assembly position, size, verticality or angle of the partition unit, and control the position, size and parallelogram angle of the top plate unit and the web unit; After assembly, weld the fillet welds between the partition unit, the bottom plate unit and the top plate unit; According to the arch rib reinforcement plate assembly position line marked in advance on the top plate unit, assemble and weld the fillet welds between the arch rib reinforcement plate unit and the top plate unit, the outer web unit and the diaphragm unit, and weld the fillet welds between the diaphragm and the top plate unit, taking the diaphragm and the outer web unit as the reference; Assemble the inner web unit and the bottom plate unit in sequence to ensure the overall assembly size of the parallelogram box, ensure the overall assembly size of the partition and the arch rib reinforcement plate at the assembly position corresponding to the arch rib, and weld the fillet welds between the partition and the top plate unit and the bottom plate unit in sequence, and weld the fillet welds between the arch rib reinforcement plate unit and the inner web unit and the bottom plate unit; Finally, assemble the crossbeam joint plate and weld the fillet welds between it and the inner web element; Assemble welded bearing stiffeners and bearing pads; Assemble and weld the support pads on the outside of the base plate unit and perform overall machining; Arch foot and arch rib manufacturing, specifically including: On the assembly tire frame, one side web plate unit and one side upper and lower corner plate units are laid and positioned. The tire frame support plate is set according to the outer dimensions of the laid plate unit to control the angle and outer dimensions of the upper and lower corner plate units. Assemble the partition unit and control the position, size and assembly angle; Lateral positioning and assembly of top plate unit and bottom plate unit; Assemble the upper and lower corner arc plate units on the other side and adjust the box opening size; Assemble the web unit on the other side; Finally, assemble and weld the foot stiffeners; The arch foot arch ribs and arch foot tie beams are pre-assembled in a horizontal pre-assembly manner. The steel arch rib reinforcement plate assembly position line of the steel tie beam is marked in advance on the outside of the steel tie beam top plate unit box according to the plate unit stage, and the steel arch ribs are aligned with the arch rib reinforcement plate in the steel tie beam box to ensure that the plate parts of the octagonal section of the arch rib are aligned with the arch rib reinforcement plate in the steel tie beam box, while ensuring the spatial position, size and angle of the arch foot tie beam and arch ribs.

2. The method for manufacturing the arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation according to claim 1, characterized in that: The arch foot tie beam includes a top plate, a web plate, a bottom plate, a partition plate, a longitudinal stiffening plate, a cross beam joint plate, a support stiffening plate, a support pad and an arch rib reinforcement plate.

3. The method for manufacturing the arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation according to claim 1, characterized in that: The top plate unit is marked with arch rib reinforcement plate assembly position lines on both sides of the stiffened side and the non-stiffened side.

4. The method for manufacturing an arch-beam joint section of a super-large cross-section steel box arch bridge suitable for waterway transportation according to claim 1, characterized in that: The partition unit includes a partition, a stiffener, and a manhole reinforcement plate, which are welded together on an assembly platform to form the partition unit.

5. The method for manufacturing the arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation according to claim 1, characterized in that: The assembly and welding sequence of the support stiffener is as follows: first assemble the first support stiffener, then weld the fillet welds between it and the partition unit and the bottom plate unit, then assemble the second support stiffener, weld the fillet welds between it and the first support stiffener, the bottom plate unit, and the inner and outer web units, assemble and weld the fillet welds between the third support stiffener and the second support stiffener and the bottom plate unit, and finally assemble and weld the fourth support stiffener.

6. The method for manufacturing the arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation according to claim 1, characterized in that: The overall flatness of the support plate after overall machining is no more than 1 mm.

7. The method for manufacturing the arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation according to claim 1, characterized in that: The arch foot and arch ribs include a top plate, a web plate, a bottom plate, an arc plate, a partition plate, a longitudinal stiffening plate, and a foot stiffening plate.

8. The method for manufacturing the arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation according to claim 1, characterized in that: The longitudinal reinforcements of the upper and lower corner arc plate units are provided with patching sections at the partitions.

9. The method for manufacturing an arch-beam joint section of a super-large cross-section steel box arch bridge suitable for water transportation according to claim 1, characterized in that: The assembly of the web plate unit on the other side specifically includes: welding the fillet welds inside the box between the upper and lower corner arc plate units and the top plate unit and the bottom plate unit, welding the butt welds inside the box between the upper and lower corner arc plate units and the web plate unit on one side, welding the fillet welds inside the box between the partition plate unit and the top plate unit, the bottom plate unit and the web plate unit, welding the fillet weld on one side outside the box between the lower corner arc plate unit and the bottom plate unit, welding the butt welds outside the box between the web plate unit on the other side and the upper and lower corner arc plate units, and welding the fillet weld outside the box between the top plate unit and the upper corner arc plate unit; Turn over 180 degrees so that the upper web unit faces downward, weld the fillet welds inside the box between the upper and lower corner arc plate units and the top plate unit and bottom plate unit, weld the butt welds inside the box between the upper and lower corner arc plate units and the web unit on the other side, weld the fillet welds between the partition unit inside the box and the web unit on the other side, weld the fillet weld on the other side outside the box between the lower corner arc plate unit and the bottom plate unit, weld the butt welds outside the box between the web unit on the other side and the upper and lower corner arc plate units, and weld the fillet weld on the other side outside the box between the top plate unit and the upper corner arc plate unit.

10. The method for manufacturing an arch-beam joint section of a super-large cross-section steel box arch bridge suitable for waterway transportation according to claim 1, characterized in that: The arch foot arch rib and the arch foot tie beam are connected by welding.

Images