Construction method of split type arched girder combination section

Abstract

The invention relates to the technical field of bridge engineering, in particular to a construction method of a split type arched girder combination section, which comprises the following steps of: installing a steel box girder to a design position; drawing an arch rib positioning line on the top surface of the steel box girder; auxiliary positioning pieces are installed at the butt joint ends of the arch ribs; the arch rib is hoisted to the steel box girder, and the arch rib is installed and positioned through an auxiliary positioning piece arranged on the arch rib and an arch rib positioning line marked on the top face of the steel box girder; and after positioning is completed, the arch rib is connected with the top face of the steel box girder in a welded mode, and therefore construction of the split type arch girder combination section is completed. According to the construction method, the arch ribs are integrally assembled in advance and then integrally hoisted on the construction site, one-step installation and positioning of the arch ribs can be completed through the arranged auxiliary positioning pieces, the precision and quality of the arch ribs are guaranteed, accurate and rapid positioning of the arch ribs can be achieved, the problem of the positioning precision of the arch ribs is effectively solved, and the construction efficiency is improved. The welding quality is improved, the manufacturing quality requirement of the key beam section of the bridge is met, and the construction progress is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a construction method for a split-type arch-beam combination section. Background Art

[0002] The manufacturing technology of steel box arch bridge is an important technology of bridge engineering, especially the manufacturing quality of the junction of arch rib and steel box beam (referred to as arch beam junction section) is more critical. Usually, the arch rib component at the end of the arch beam junction section directly extends into the inside of the steel box beam, thus forming an integral structure. However, in actual construction, if the arch rib component and the steel box beam are welded in advance and then hoisted as a whole, the hoisting difficulty is large. In order to reduce the hoisting difficulty, the arch rib component and the steel box beam are separated into independent components, and then the arch rib component is welded and connected on the top surface of the steel box beam. The existing method is a scattered assembly method of beam first and arch later. The steel box beam is first assembled at the set position, and then the arch rib is assembled in sequence by scattered assembly. The existing problem is that the arch rib is difficult to locate in the bridge site environment, and the accuracy of its external dimensions is difficult to guarantee. In addition, when the arch rib is actually welded, the welds are mostly vertical welding and overhead welding, which is difficult to weld and the weld quality is difficult to control. In addition, some areas cannot be welded due to the small welding space. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a construction method for a split arch-beam joint section to solve the problems of the existing arch rib loose assembly method, such as difficulty in positioning, difficulty in ensuring the accuracy of the external dimensions, great difficulty in welding, difficulty in controlling the quality of the weld, and inability to complete welding in some areas due to small welding space.

[0004] The technical solution to achieve the above purpose is:

[0005] The present invention provides a construction method for a split-type arch-beam combination section, comprising the following steps:

[0006] Provide steel box girders and install them to the designed position;

[0007] Marking an arch rib positioning line on the top surface of the steel box girder;

[0008] Providing arch ribs and installing auxiliary positioning pieces at the butt ends of the arch ribs;

[0009] Hoist the provided arch rib onto the steel box girder, and install and position the arch rib by using the auxiliary positioning pieces provided on the arch rib and the arch rib positioning lines drawn on the top surface of the steel box girder;

[0010] After the positioning is completed, the arch rib is welded to the top surface of the steel box girder, thereby completing the construction of the split arch-beam joint section.

[0011] A further improvement of the construction method of the split arch-beam joint section of the present invention is that installing the auxiliary positioning piece at the butt end of the arch rib comprises the following steps:

[0012] A plurality of positioning plates are provided, and the positioning plates are welded and fixed on the side edges at the butt joint ends of the arch ribs, and the lower surfaces of the positioning plates are flush with the end faces of the corresponding side edges of the butt joint ends of the arch ribs.

[0013] A further improvement of the construction method of the split arch-beam combination section of the present invention is that the step of marking the arch rib positioning line on the top surface of the steel box beam comprises:

[0014] On the top surface of the steel box girder, a corresponding arch rib positioning line is drawn according to the outer contour of the butt end of the arch rib;

[0015] An auxiliary positioning line is drawn on the arch rib positioning line according to the position of the auxiliary positioning piece.

[0016] A further improvement of the construction method of the split arch-beam combination section of the present invention is that providing the arch ribs comprises the following steps:

[0017] Providing a top plate unit, and placing the top plate unit on an assembly platform;

[0018] Providing a middle web unit, erecting the middle web unit on the top plate unit, and welding the middle web unit to the top plate unit;

[0019] Providing a plurality of partitions of different sizes, sleeve the plurality of partitions on the middle web unit, and welding the bottom of the partition to the top plate unit, and welding the partition to the corresponding middle web;

[0020] Providing an upper plate unit and a lower plate unit, arranging the upper plate unit on both sides of the top plate unit, welding the upper plate unit to the top plate unit and the corresponding partition, butt-welding the lower plate unit to the upper plate unit, and welding the lower plate unit to the corresponding partition;

[0021] A bottom plate unit smaller in size than the top plate unit is provided, the bottom plate unit is placed on the middle web plate unit and docked with the lower side plate unit, and the bottom plate unit is welded to the middle web plate unit and the lower side plate unit, thereby completing the production of the arch rib.

[0022] A further improvement in the construction method of the split arch-beam combination section of the present invention is that, when installing the auxiliary positioning parts, a plurality of positioning plates are provided, and the positioning plates are welded to the outer sides of the top plate unit, the upper side plate unit, the lower side plate unit and the bottom plate unit, so that the lower surface of the positioning plate is flush with the lower surface of the outer sides of the top plate unit, the upper side plate unit, the lower side plate unit and the bottom plate unit.

[0023] A further improvement of the construction method of the split arch-beam joint section of the present invention is that, when welding the arch rib and the steel box girder, a welding robot is provided, the welding robot is allowed to enter the arch rib and weld the connection between the structure inside the arch rib and the steel box girder.

[0024] A further improvement of the construction method of the split arch-beam combination section of the present invention is that providing a steel box beam comprises the following steps:

[0025] Providing a pushing platform, on which a tire frame is installed;

[0026] Providing a beam bottom plate, and placing the beam bottom plate on the tire frame;

[0027] Providing a plurality of beam partitions, placing the beam partitions on the beam bottom plate, and welding the beam partitions to the beam bottom plate;

[0028] Providing a beam mid-web, placing the beam mid-web between oppositely disposed beam mid-spacers, placing the beam mid-web on the beam bottom plate, and welding the beam mid-web to the beam bottom plate and the beam mid-spacer;

[0029] Providing a beam side web, arranging the beam side web on both sides of the beam bottom plate, welding the beam side web to the beam bottom plate, and welding the beam side web to the corresponding beam middle partition plate;

[0030] A beam top plate is provided, and the beam top plate is placed on the beam side webs, the beam middle webs and the beam middle partitions, and the beam top plate is welded to the beam side webs, the beam middle webs and the beam middle partitions, thereby completing the assembly of the steel box beam.

[0031] A further improvement of the construction method of the split arch-beam combination section of the present invention is that after the assembly of the steel box girder is completed, the jacking platform is used to jack the tire frame and the steel box girder on the tire frame to the designed position to complete the installation of the steel box girder.

[0032] A further improvement of the construction method of the split arch-beam combination section of the present invention is that the drawn arch rib positioning line is hexagonal.

[0033] The construction method of the split arch-beam combination section of the present invention has the following beneficial effects:

[0034] The construction method of the present invention pre-assembles the arch rib as a whole, and then hoistes it as a whole at the construction site. The one-step installation and positioning of the arch rib can be completed through the auxiliary positioning parts provided, which not only ensures the accuracy and quality of the arch rib, but also can realize the accurate and rapid positioning of the arch rib, effectively solves the problem of arch rib positioning accuracy, improves welding quality, ensures the manufacturing quality requirements of key beam sections of the bridge, and speeds up the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a flow chart of the construction method of the split arch-beam combination section.

[0036] Figure 2 It is a schematic diagram of the three-dimensional structure of the arch-beam combination section in the construction method of the split arch-beam combination section of the present invention.

[0037] Figure 3 It is a structural schematic diagram of the construction method of the split arch-beam combination section of the present invention after the arch-beam combination section is connected and the upper side plate unit and the lower side plate unit on one side are omitted.

[0038] Figure 4 It is a structural schematic diagram of the connection between the top plate unit and the middle web plate unit of the arch rib in the construction method of the split arch-beam combination section of the present invention.

[0039] Figure 5 It is a structural schematic diagram of assembling the partition of the arch rib to the top plate unit and the middle web plate unit in the construction method of the split arch-beam combination section of the present invention.

[0040] Figure 6 It is a structural schematic diagram of the upper side plate unit of the arch rib being assembled onto the top plate unit and the partition plate in the construction method of the split arch-beam combination section of the present invention.

[0041] Figure 7 It is a structural schematic diagram of assembling the lower side plate unit of the arch rib to the upper side plate unit and the partition in the construction method of the split arch-beam combination section of the present invention.

[0042] Figure 8 It is a structural schematic diagram of assembling the bottom plate unit of the arch rib to the lower side plate unit and the middle web plate unit in the construction method of the split arch-beam combination section of the present invention.

[0043] Fig. 9 It is a structural schematic diagram of installing auxiliary positioning parts on the arch rib in the construction method of the split arch-beam combination section of the present invention.

[0044] Fig.10 It is a structural schematic diagram of the beam bottom plate of the steel box beam in the construction method of the split arch-beam combination section of the present invention.

[0045] Fig.11It is a structural schematic diagram of assembling the beam mid-partition plate and beam mid-web plate of a steel box beam on the beam bottom plate in the construction method of the split arch-beam combination section of the present invention.

[0046] Fig.12 It is a structural schematic diagram of assembling the side webs of the steel box beam on the middle partition plate and the bottom plate of the beam in the construction method of the split arch-beam combination section of the present invention.

[0047] Fig.13 It is a structural schematic diagram of the construction method of the split arch-beam combination section of the present invention in which the beam top plate of the steel box beam is assembled to the beam side web plate, the beam middle web plate and the beam middle partition plate.

[0048] Fig.14 It is a structural schematic diagram of the arch rib positioning line and the auxiliary positioning line in the construction method of the split arch-beam combination section of the present invention. DETAILED DESCRIPTION

[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0050] See also Figure 1 The present invention provides a construction method for a split-type arch-beam combination section, which is used to solve the problems of arch rib positioning difficulties in the existing arch-beam combination section using loose assembly, difficulty in ensuring the accuracy of the external dimensions, vertical welding and overhead welding, high welding difficulty, difficulty in controlling the quality of the weld, and inability to complete welding in some areas due to small welding space. The construction method of the present invention assembles the arch ribs as a whole in the factory, and installs auxiliary positioning parts on the arch ribs. After the steel box girder at the bridge site is installed, the arch rib positioning line is accurately drawn on the top of the steel box girder. The arch rib can be quickly installed and positioned by using the auxiliary positioning parts and the arch rib positioning line, and then the arch rib and the steel box girder are welded, which solves the problem of arch rib positioning accuracy, improves welding quality, ensures the manufacturing quality requirements of the key beam section of the bridge, and speeds up the construction progress. The construction method of the split-type arch-beam combination section of the present invention is described below in conjunction with the accompanying drawings.

[0051] See also Figure 1 , showing a flow chart of the construction method of the split arch-beam combination section of the present invention. Figure 1 , the construction method of the split arch-beam combination section of the present invention is explained.

[0052] like Figure 1 As shown, the construction method of the split arch-beam combination section of the present invention comprises the following steps:

[0053] Execute step S11, provide a steel box girder, and install the steel box girder to the designed position; then execute step S12;

[0054] Execute step S12 to draw an arch rib positioning line on the top surface of the steel box girder; then execute step S13;

[0055] Execute step S13 to provide an arch rib, and install an auxiliary positioning piece at the butt end of the arch rib; then execute step S14;

[0056] Execute step S14; hoist the provided arch rib onto the steel box girder, and install and position the arch rib by using the auxiliary positioning piece provided on the arch rib and the arch rib positioning line drawn on the top surface of the steel box girder; then execute step S15;

[0057] Execute step S15, after the positioning is completed, the arch rib is welded to the top surface of the steel box girder, thereby completing the construction of the split arch-beam joint section.

[0058] like Figure 2 As shown, the split arch-beam combination section of the present invention includes a steel box girder 21 and an arch rib 22 arranged on the steel box girder 21. The top surface of the steel box girder 21 is provided with a carriageway portion and a sidewalk portion, and the carriageway portion and the sidewalk portion have opposite transverse slopes of 1.5%, and the end of the arch rib 22 is located as a whole on the transverse slope change point of the top surface of the steel box girder 21, that is, the welding positions between the side edges of the end of the arch rib 22 and the top surface of the steel box girder 21 are not coplanar, and the arch rib 22 is an inward-inclined basket arch form, and a three-way pre-arch is added to the arch rib 22 during the manufacturing process, which brings great difficulties to the welding of the arch rib 22 and the steel box girder 21. In addition, the welding position of the arch rib 22 and the steel box girder 21 requires a full penetration weld to improve the connection strength between the two. Based on this, if the arch rib 22 is installed by a loose assembly method on site, the installation difficulty is very large and the installation quality is difficult to meet the requirements. Therefore, the present invention adopts a split construction method, first assembling the steel box girder, then assembling the arch rib, and then positioning the arch rib on the steel box girder, and then completing the welding of the two, thereby reducing the construction difficulty, improving the construction quality, speeding up the construction progress, and ensuring the quality requirements of the key part of the bridge, namely the arch-beam joint section.

[0059] In a specific implementation of the present invention, in order to ensure the quality requirements of the arch-beam joint section, when processing the component units of the steel box beam 21 and the arch rib 22, the manufacturing accuracy of each component unit should be ensured.

[0060] First, manufacture each component unit (such as plate unit), and achieve the goal of overall beam segment accuracy control by controlling the machining accuracy of parts and the assembly and welding accuracy of each component unit. Figures 10 to 13 As shown, the component units of the steel box beam 21 include a beam bottom plate 211, a beam middle partition plate 212, a beam middle web plate 213, a beam side web plate 214 and a beam top plate 215; Figure 3 As shown, the structural units of the arch rib 22 include a top plate unit 221 , a middle web plate unit 222 , a partition plate 223 , an upper side plate unit 224 , a lower side plate unit 225 and a bottom plate unit 226 .

[0061] Furthermore, in order to reduce the overall welding deformation of the steel box girder and ensure the overall dimensions and bridge line shape, the steel box girder 21 is assembled on the tire frame. The assembly tire frame is designed according to the structural characteristics, the tire frame foundation is required to have sufficient bearing capacity, and the overall structure is required to have sufficient rigidity and good stability. The assembly of both ends of the steel box girder is completed on the tire frame to ensure the accuracy of the assembly line shape and the joint of the steel box girder. After the assembly is completed, the tire frame and the steel box girder assembled thereon are pushed to the bridge position as a whole through the pushing platform to complete the installation of the steel box girder.

[0062] Specifically, providing the steel box girder 21 includes the following steps:

[0063] Provide a jacking platform and install the tire frame on the jacking platform;

[0064] like Figures 10 to 13 As shown, a beam bottom plate 211 is provided, and the beam bottom plate 211 is placed on the tire frame;

[0065] Providing a plurality of beam partitions 212, placing the beam partitions 212 on the beam bottom plate 211, and welding the beam partitions 212 to the beam bottom plate 211;

[0066] Provide a beam mid-web plate 213, place the beam mid-web plate 213 between the beam mid-spacers 212 that are oppositely disposed, place the beam mid-web plate 213 on the beam bottom plate 211, and weld the beam mid-web plate 213 to the beam bottom plate 211 and the beam mid-spacer 212;

[0067] Provide a beam side web 214, arrange the beam side web 214 on both sides of the beam bottom plate 211, weld the beam side web 214 to the beam bottom plate 211, and weld the beam side web 214 to the corresponding beam middle partition plate 212;

[0068] A beam top plate 215 is provided, and the beam top plate 215 is placed on the beam side webs 214, the beam middle webs 213 and the beam middle partition 212, and the beam top plate 215 is welded to the beam side webs 214, the beam middle webs 213 and the beam middle partition 212, thereby completing the assembly of the steel box girder 21.

[0069] Furthermore, after the assembly of the steel box girder 21 is completed, the tire frame and the steel box girder 21 on the tire frame are pushed to the designed position by using the pushing platform to complete the installation of the steel box girder 21 .

[0070] Furthermore, the beam bottom plate 211 includes a plurality of beam bottom unit plates connected by splicing. When positioning the beam bottom plate, the beam bottom unit plates are assembled from the center to both sides in sequence based on the horizontal baseline and the vertical baseline, and the width is connected. The symmetrical welding method is adopted, that is, when assembling from the center to both sides, the beam bottom plate units on both sides are symmetrically welded to improve the assembly accuracy and quality of the beam bottom plate. The beam middle partition plate 212, the beam middle web plate 213 and the beam side web plate 214 are welded in sequence. When welding, attention should be paid to controlling the position and verticality. For the structure of the symmetrical arrangement of the beam middle partition plate 212 and the beam side web plate 214, symmetrical welding is adopted to strictly control the welding quality between each plate unit. The beam top plate 215 includes a plurality of beam top plate units connected by splicing. The beam top plate units are welded from the middle to both sides. U ribs are arranged on the bottom surface of the beam top plate units, and the corner welding position of the U rib notch is polished and smoothed, thereby improving the fatigue resistance of the bridge deck of the steel box girder 21 and the durability of the bridge. Finally, the longitudinal welds of the beam top plate unit are welded from the middle to both sides.

[0071] In a specific embodiment of the present invention, the installation of the arch rib can be carried out by in-factory manufacturing, combined with Figures 4 to 8 As shown, the top plate unit 221 is placed on the assembly platform, and then the middle plate unit 222 is assembled. The partition plate 223, the upper side plate unit 224, the lower side plate unit 225 and the bottom plate unit 226 are welded in sequence. After the assembly is completed, the main welds of the arch rib 22 and other internal welds can be welded in a flat position. The welding quality is strictly controlled. The main welds of the box body are welded symmetrically, and thermal correction is used to control welding deformation. After welding, flame trimming is used to control the diagonal size of the box opening.

[0072] Specifically, providing the arch ribs comprises the following steps:

[0073] Providing a top plate unit 221, and placing the top plate unit 221 on an assembly platform;

[0074] Providing a middle web unit 222, erecting the middle web unit 222 on the top plate unit 221, and welding the middle web unit 222 to the top plate unit 221;

[0075] Providing a plurality of partitions 223 of different sizes, sleeve the plurality of partitions 223 on the middle web unit 222, and welding the bottom of the partition 223 to the top plate unit 221, and welding the partition 223 to the corresponding middle web 222;

[0076] Provide an upper plate unit 224 and a lower plate unit 225, arrange the upper plate unit 224 on both sides of the top plate unit 221, weld the upper plate unit 224 to the top plate unit 221 and the corresponding partition 223, butt weld the lower plate unit 225 to the upper plate unit 224, and weld the lower plate unit 225 to the corresponding partition 223;

[0077] A bottom plate unit 226 having a smaller size than the top plate unit 221 is provided, the bottom plate unit 226 is placed on the middle web plate unit 222 and docked with the lower side plate unit 225, and the bottom plate unit 226 is welded to the middle web plate unit 222 and the lower side plate unit 226, thereby completing the production of the arch rib 22.

[0078] Furthermore, installing the auxiliary positioning piece at the butt end of the arch rib includes the following steps:

[0079] like Fig. 9 As shown, a plurality of positioning plates 23 are provided, and the positioning plates 23 are welded and fixed to the respective side edges at the butt ends of the arch ribs 22 , and the lower surfaces of the positioning plates 23 are flush with the end faces of the corresponding side edges of the butt ends of the arch ribs 22 .

[0080] The end of the arch rib 22 is hexagonal, and a positioning plate 23 is arranged at the lower end of the outer side of the top plate unit 221, the upper side plate unit 224, the lower side plate unit 225 and the bottom plate unit 226. The bottom surface or lower surface of the positioning plate 23 is flush with the bottom surface or lower surface of the corresponding top plate unit 221, the upper side plate unit 224, the lower side plate unit 225 and the bottom plate unit 226.

[0081] Furthermore, if Fig.14 As shown, the steps of drawing the arch rib positioning line on the top surface of the steel box girder include: drawing the corresponding arch rib positioning line 24 on the top surface of the steel box girder according to the outer contour of the butt end of the arch rib; and drawing the auxiliary positioning line 25 on the arch rib positioning line 24 according to the position of the auxiliary positioning piece.

[0082] Furthermore, the drawn arch rib positioning line 24 is hexagonal.

[0083] Furthermore, when welding the arch rib and the steel box girder, a welding robot is provided, and the welding robot is allowed to enter the arch rib and weld the connection between the internal structure of the arch rib and the steel box girder.

[0084] Before assembling the arch rib, accurately mark the arch rib positioning line on the top surface of the steel box girder, hoist the arch rib, align it with the arch rib positioning line on the top surface of the steel box girder through the auxiliary positioning parts pre-installed on the arch rib, and install and position it in one step. First, weld the welds between the main component units inside the arch rib and the top surface of the steel box girder. Use a small welding robot to weld the internal welds in the narrow space that is inconvenient to enter, and then clean and weld from the outside of the arch rib to ensure the quality of the circumferential penetration welds between the top, bottom, web of the arch rib and the top plate of the steel box girder.

[0085] The present invention provides a construction method for a split arch-beam joint section. For this type of arch-beam joint section, welding deformation, welding quality and arch rib installation accuracy have a great influence on the overall quality of the steel box girder, especially the guarantee of arch rib positioning accuracy. A reasonable assembly and welding sequence can improve the overall welding quality of the steel box girder and control the welding deformation and geometric dimension accuracy of the beam body. This area is the most critical load-bearing area of ​​the bridge. The use of such a split manufacturing and assembly method is conducive to improving the assembly accuracy of the arch rib part and ensuring the cross-sectional dimension accuracy of the arch rib docking area. Since the arch rib is manufactured in the factory in whole sections, the arch rib can be turned over for welding, and the flat welding of multi-position penetration welds can be realized, ensuring the penetration welding quality and manufacturing accuracy of the main weld of the arch rib, and the use of a precise positioning method improves the assembly accuracy of the arch rib.

[0086] The invention discloses a construction method for a split-type arch-beam joint section, which solves the problem of arch rib positioning accuracy, improves welding quality, ensures manufacturing quality requirements for key bridge beam sections, and accelerates construction progress.

[0087] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A construction method for a split arch-beam joint section, characterized in that: The steps include: Provide steel box girders and install them to the designed position; Marking an arch rib positioning line on the top surface of the steel box girder; Providing arch ribs and installing auxiliary positioning pieces at the butt ends of the arch ribs; Hoist the provided arch rib onto the steel box girder, and install and position the arch rib by using the auxiliary positioning pieces provided on the arch rib and the arch rib positioning lines drawn on the top surface of the steel box girder; After the positioning is completed, the arch rib is welded to the top surface of the steel box girder, thereby completing the construction of the split arch-beam joint section.

2. The construction method of the split arch-beam joint section according to claim 1, characterized in that: The steps of installing the auxiliary positioning piece at the butt end of the arch rib include: A plurality of positioning plates are provided, and the positioning plates are welded and fixed on the side edges at the butt joint ends of the arch ribs, and the lower surfaces of the positioning plates are flush with the end faces of the corresponding side edges of the butt joint ends of the arch ribs.

3. The construction method of the split arch-beam joint section according to claim 1, characterized in that: The step of marking an arch rib positioning line on the top surface of the steel box girder comprises: On the top surface of the steel box girder, a corresponding arch rib positioning line is drawn according to the outer contour of the butt end of the arch rib; An auxiliary positioning line is drawn on the arch rib positioning line according to the position of the auxiliary positioning piece.

4. The construction method of the split arch-beam joint section according to claim 1, characterized in that: Providing the arch ribs comprises the following steps: Providing a top plate unit, and placing the top plate unit on an assembly platform; Providing a middle web unit, erecting the middle web unit on the top plate unit, and welding the middle web unit to the top plate unit; Providing a plurality of partitions of different sizes, sleeve the plurality of partitions on the middle web unit, and welding the bottom of the partition to the top plate unit, and welding the partition to the corresponding middle web; Providing an upper plate unit and a lower plate unit, arranging the upper plate unit on both sides of the top plate unit, welding the upper plate unit to the top plate unit and the corresponding partition, butt-welding the lower plate unit to the upper plate unit, and welding the lower plate unit to the corresponding partition; A bottom plate unit smaller in size than the top plate unit is provided, the bottom plate unit is placed on the middle web plate unit and docked with the lower side plate unit, and the bottom plate unit is welded to the middle web plate unit and the lower side plate unit, thereby completing the production of the arch rib.

5. The construction method of the split arch-beam joint section according to claim 4, characterized in that: When installing the auxiliary positioning parts, provide a plurality of positioning plates, and weld the positioning plates to the outer sides of the top plate unit, the upper side plate unit, the lower side plate unit and the bottom plate unit, so that the lower surfaces of the positioning plates are flush with the lower surfaces of the outer sides of the top plate unit, the upper side plate unit, the lower side plate unit and the bottom plate unit.

6. The construction method of the split arch-beam joint section according to claim 1, characterized in that: When welding the arch rib and the steel box girder, a welding robot is provided, and the welding robot is allowed to enter the arch rib and weld the connection between the structure inside the arch rib and the steel box girder.

7. The construction method of the split arch-beam joint section according to claim 1, characterized in that: Providing steel box girders includes the following steps: Providing a pushing platform, on which a tire frame is installed; Providing a beam bottom plate, and placing the beam bottom plate on the tire frame; Providing a plurality of beam partitions, placing the beam partitions on the beam bottom plate, and welding the beam partitions to the beam bottom plate; Providing a beam mid-web, placing the beam mid-web between oppositely disposed beam mid-spacers, placing the beam mid-web on the beam bottom plate, and welding the beam mid-web to the beam bottom plate and the beam mid-spacer; Providing a beam side web, arranging the beam side web on both sides of the beam bottom plate, welding the beam side web to the beam bottom plate, and welding the beam side web to the corresponding beam middle partition plate; A beam top plate is provided, and the beam top plate is placed on the beam side webs, the beam middle webs and the beam middle partitions, and the beam top plate is welded to the beam side webs, the beam middle webs and the beam middle partitions, thereby completing the assembly of the steel box beam.

8. The construction method of the split arch-beam joint section according to claim 7, characterized in that: After the assembly of the steel box girder is completed, the jacking platform is used to jack the tire frame and the steel box girder on the tire frame to the designed position to complete the installation of the steel box girder.

9. The construction method of the split arch-beam joint section according to claim 1, characterized in that: The arch rib positioning lines drawn are hexagonal.

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