A forked steel box arch rib and construction method thereof

Abstract

The invention discloses a forked steel box arch rib and a construction method thereof, comprising a first single-limb arch rib, a second single-limb arch rib and a combined arch rib, wherein a gap is arranged between the first end of the first single-limb arch rib and the first end of the second single-limb arch rib; a tiny gap of no more than 6 cm is arranged between the second end of the first single-limb arch rib and the second end of the second single-limb arch rib, and both are fixedly connected to the first end of the combined arch rib, that is, the first single-limb arch rib, the second single-limb arch rib and the combined arch rib form a "human"-shaped structure; the invention adopts the form of butt welding of two inner webs and one middle web, thereby realizing effective transmission of web force, maximally ensuring the full-length continuity of various types of plates of the forked steel box arch rib, the forked point connection structure does not need to specially arrange local stiffening plates, thus reducing the number of welds, simplifying the construction steps, reducing the construction difficulty, and realizing the landscape effect of two steel box arch ribs being completely tangent and combined into a single-limb steel box arch rib while satisfying the structural stress.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a bifurcated steel box arch rib and a construction method thereof. Background Art

[0002] As an important building built to cross natural or artificial obstacles, bridges not only improve the efficiency of urban traffic, but also provide a unique stage for displaying the city's style. Arch bridges are a type of bridge that has been widely used since ancient times.

[0003] As an important building built to cross natural or artificial obstacles, bridges not only improve the efficiency of urban traffic, but also provide a unique stage for displaying the city's style. Due to its reasonable structure and beautiful lines, arch bridges are a type of bridge that has been widely used since ancient times.

[0004] With the rapid development of my country's economy, the demand for bridge aesthetics and modeling in bridge construction is constantly increasing. In order to meet the demand for modeling, there is a situation where two-legged steel box arch ribs gradually merge into a single-legged steel box arch rib. The tangent bifurcation of the steel box arch rib is the ultimate pursuit of this type of bridge landscape and is also the biggest highlight. At present, the problems of most bifurcated steel box arch bridges are that the continuity of the bifurcated structural plates is poor, the structural force transmission is not direct, and more local stiffening plates are required. The structure is complex and the construction difficulty is high, and it is difficult to achieve a landscape effect of nearly tangent bifurcation. It is necessary to invent a steel box arch rib bifurcated structure with reasonable force, safety and reliability. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the forked structural plates of a forked steel box arch bridge have poor continuity, the structural force transmission is not direct, a large number of local stiffening plates need to be set, the structure is complex, the construction difficulty is high, and it is difficult to achieve the landscape effect of nearly tangential bifurcation. The purpose is to provide a forked steel box arch rib and a construction method thereof, which improves the landscape effect of the forked steel box arch and solves the structural and installation problems at the junction of two single-limb arch ribs of the forked steel box arch bridge.

[0006] The present invention is achieved through the following technical solutions:

[0007] A bifurcated steel box arch rib, comprising:

[0008] A combined rib having a first end and a second end;

[0009] a first single-limbed rib having a first end and a second end;

[0010] A second single-limbed arch rib having a first end and a second end; a gap is provided between the first end of the first single-limbed arch rib and the first end of the second single-limbed arch rib;

[0011] The second end of the first single-limb arch rib and the second end of the second single-limb arch rib are both fixedly connected to the first end of the combined arch rib; a second gap is arranged between the second end of the first single-limb arch rib and the second end of the second single-limb arch rib, the first gap is larger than the second gap, and the second gap does not exceed 6 cm.

[0012] Specifically, the merged arch rib includes a first outer web, a second outer web, a middle web, a first top plate, a second top plate, a first bottom plate, and a second bottom plate; the two long sides of the first top plate are respectively fixedly connected to the top edge of the first outer web and the top edge of the middle web, the two long sides of the first bottom plate are respectively fixedly connected to the bottom edge of the first outer web and the bottom edge of the middle web, the two long sides of the second top plate are respectively fixedly connected to the top edge of the second outer web and the top edge of the middle web, and the two long sides of the second bottom plate are respectively fixedly connected to the bottom edge of the second outer web and the bottom edge of the middle web.

[0013] The first single-limb arch rib comprises an outer web a, an inner web a, a top plate a, and a bottom plate a; two long sides of the top plate a are respectively fixedly connected to the top edge of the outer web a and the top edge of the inner web a, and two long sides of the bottom plate a are respectively fixedly connected to the bottom edge of the outer web a and the bottom edge of the inner web a;

[0014] The second single-leg arch rib comprises an outer web b, an inner web b, a top plate b, and a bottom plate b; the two long sides of the top plate b are respectively fixedly connected to the top edge of the outer web b and the top edge of the inner web b, and the two long sides of the bottom plate b are respectively fixedly connected to the bottom edge of the outer web b and the bottom edge of the inner web b;

[0015] Furthermore, the outer web a is the continuation of the first outer web, and the two are smoothly continuous throughout the length; the outer web b is the continuation of the second outer web, and the two are smoothly continuous throughout the length; the top plate a is the continuation of the first top plate, and the two are smoothly continuous throughout the length; the top plate b is the continuation of the second top plate, and the two are smoothly continuous throughout the length; the bottom plate a is the continuation of the first bottom plate, and the two are smoothly continuous throughout the length; the bottom plate b is the continuation of the second bottom plate, and the two are smoothly continuous throughout the length.

[0016] Furthermore, the inner web a and the middle web, as well as the inner web b and the middle web are connected by full penetration butt welding.

[0017] Furthermore, a plurality of first transverse partitions and a plurality of second transverse partitions are arranged in the merged arch rib, and the positions of the first transverse partitions and the second transverse partitions correspond to the middle web of the merged arch rib; the four sides of the first transverse partition are respectively fixedly connected to the inner side surfaces of the first outer web, the middle web, the first top plate and the first bottom plate; the four sides of the second transverse partition are respectively fixedly connected to the inner side surfaces of the second outer web, the middle web, the second top plate and the second bottom plate.

[0018] A plurality of transverse partitions a are arranged in the first single-limb arch rib, and the four sides of the transverse partitions a are respectively fixedly connected to the inner side surfaces of the outer web a, the inner web a, the top plate a and the bottom plate a.

[0019] A plurality of transverse partitions b are arranged in the second single-leg arch rib, and the four sides of the transverse partitions b are respectively fixedly connected to the inner side surfaces of the outer web b, the inner web b, the top plate b and the bottom plate b.

[0020] Furthermore, manholes are provided at the centers of the first transverse partition, the second transverse partition, the transverse partition a, and the transverse partition b.

[0021] Furthermore, a plurality of longitudinal stiffening ribs are arranged at intervals on the inner walls of the combined arch rib, the first single-limb arch rib and the second single-limb arch rib, and the longitudinal stiffening ribs are all kept continuous throughout the entire length.

[0022] Furthermore, the first transverse partition, the second transverse partition, the transverse partition a, and the transverse partition b are provided with through holes for the longitudinal stiffening ribs to pass through.

[0023] Furthermore, at the first end of the merged rib, the thickness of the middle web is locally thickened to be greater than the sum of the thicknesses of the inner web a and the inner web b.

[0024] A construction method for a forked steel box arch rib, used for installing a forked steel box arch rib as described above, the method comprising:

[0025] 1) Steel cutting: The pre-treated steel plates are cut and edge-processed according to the component plates to form the first outer web, the second outer web, the middle web, the first top plate, the second top plate, the first bottom plate, the second bottom plate, the outer web a, the inner web a, the top plate a, the bottom plate a, the outer web b, the inner web b, the top plate b, the bottom plate b, the longitudinal stiffening ribs, the first diaphragm, the second diaphragm, the diaphragm a, and the diaphragm b of the set shapes and sizes.

[0026] 2) Plate assembly: First, weld the longitudinal stiffening ribs to the corresponding mother plate, and leave a 300mm embedded section at the connection position of the inner web a, inner web b and the middle web. Then complete the butt welding connection of the inner web a, inner web b and the middle web, open grooves at the ends of the inner web a and inner web b, and set a ceramic liner in the gap between them. By adopting a single-sided welding and double-sided forming welding process, the full penetration butt connection of the inner web a, inner web b and the middle web is achieved.

[0027] Afterwards, place the first continuous bottom plate and bottom plate a, the second continuous bottom plate and bottom plate b on the tire frame, connect them into the integral inner web a, inner web b and middle web, and complete the welding connection between the above plates, and then weld the first continuous outer web and outer web a, the second continuous outer web and outer web b, the first diaphragm, the second diaphragm, the diaphragm a, the diaphragm b in sequence according to the set position, and finally assemble the first continuous top plate and top plate a and the second continuous top plate and top plate b.

[0028] 3) Overall lifting: After the panels are assembled, they are painted with anti-corrosion paint and then hoisted as a whole.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] The present invention adopts the form of butt welding of two inner webs and one middle web, which realizes the effective transmission of web force and maximizes the continuity of various types of plates of the bifurcated steel box arch rib. The bifurcated point connection structure does not need to specially set local stiffening plates. The structure is simple, the structure transmits force smoothly, the integrity is good, the number of welds is reduced, the construction steps are simplified, and the construction difficulty is reduced. While meeting the structural force, the landscape effect of two steel box arch ribs being completely tangent to each other to form a single steel box arch rib is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation of the embodiments of the present invention.

[0032] Figure 1 It is a schematic structural diagram of a bifurcated steel box arch rib according to the present invention.

[0033] Figure 2 It is a top view of a bifurcated steel box arch rib according to the present invention.

[0034] Figure 3 is a first end cross-sectional view of the first single-limb arch rib and the second single-limb arch rib according to the present invention.

[0035] Figure 4 is a first end cross-sectional view of the combined arch rib according to the present invention.

[0036] Figure 5 It is a large-scale drawing of the butt connection between the inner web a of the first single-limb arch rib, the inner web b of the second single-limb arch rib and the middle web of the combined arch rib according to the present invention.

[0037] Reference numerals: 1-first single-limb arch rib, 2-second single-limb arch rib, 3-combined arch rib;

[0038] 1.1-outer web a, 1.2-inner web a, 1.3-top plate a, 1.4-bottom plate a, 1.5-transverse diaphragm a;

[0039] 2.1-outer web b, 2.2-inner web b, 2.3-top plate b, 2.4-bottom plate b, 2.5-transverse diaphragm b;

[0040] 3.1 - first outer web, 3.2 - second outer web, 3.3 - middle web, 3.4 - first top plate, 3.5 - second top plate, 3.6 - first bottom plate, 3.7 - second bottom plate, 3.8 - first transverse diaphragm, 3.9 - second transverse diaphragm. DETAILED DESCRIPTION

[0041] To make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific implementation methods described herein are only used to explain the relevant content, rather than to limit the present invention.

[0042] It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0043] In the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. Figure 1 , Figure 2 , Figure 3 and Figure 4 The present invention is described in detail with reference to the embodiments. Figure 1 and Figure 2 The first top plate 3.4, the second top plate 3.5, the top plate a1.3 and the top plate b2.3 have been removed and are not shown.

[0044] The present invention adopts the form of butt welding of two inner webs and one middle web, realizes the effective transmission of web force, and guarantees the continuity of various types of plates of bifurcated steel box arch ribs to the maximum extent. The bifurcated point connection structure does not need to specially set up local stiffening plates, and the structure is simple, the structure transmits force smoothly, the integrity is good, and the number of welds is reduced, the construction steps are simplified, and the construction difficulty is reduced. While satisfying the structural force, the landscape effect of two limbs of steel box arch ribs being completely tangent and combined into a single limb of steel box arch rib is achieved. It is specifically described according to the following embodiments.

[0045] Embodiment 1

[0046] This embodiment provides a bifurcated steel box arch rib, including a first single-limb arch rib 1, a second single-limb arch rib 2 and a combined arch rib 3.

[0047] For ease of description, the two ends of the first single-limb arch rib 1 are set to be the first end and the second end respectively, the two ends of the second single-limb arch rib 2 are set to be the first end and the second end respectively, and the two ends of the combined arch rib 3 are set to be the first end and the second end respectively.

[0048] A first gap is arranged between the first end of the first single-limb arch rib 1 and the first end of the second single-limb arch rib 2, and a tiny second gap of no more than 6 cm is arranged between the second end of the first single-limb arch rib 1 and the second end of the second single-limb arch rib 2, and both are fixedly connected to the first end of the combined arch rib 3, that is, the first single-limb arch rib 1, the second single-limb arch rib 2 and the combined arch rib 3 form a "human" shaped structure.

[0049] The combined arch rib 3 includes a first outer web 3.1, a second outer web 3.2, a middle web 3.3, a first top plate 3.4, a second top plate 3.5, a first bottom plate 3.6, and a second bottom plate 3.7; the two long sides of the first top plate 3.4 are fixedly connected to the top edge of the first outer web 3.1 and the top edge of the middle web 3.3, respectively; the two long sides of the first bottom plate 3.6 are fixedly connected to the bottom edge of the first outer web 3.1 and the bottom edge of the middle web 3.3, respectively; the two long sides of the second top plate 3.5 are fixedly connected to the top edge of the second outer web 3.2 and the top edge of the middle web 3.3, respectively; and the two long sides of the second bottom plate 3.7 are fixedly connected to the bottom edge of the second outer web 3.2 and the bottom edge of the middle web 3.3, respectively.

[0050] The first single-leg arch rib 1 comprises an outer web a1.1, an inner web a1.2, a top plate a1.3, and a bottom plate a1.4; the two long sides of the top plate a1.3 are respectively fixedly connected to the top edge of the outer web a1.1 and the top edge of the inner web a1.2, and the two long sides of the bottom plate a1.4 are respectively fixedly connected to the bottom edge of the outer web a1.1 and the bottom edge of the inner web a1.2;

[0051] The second single-leg arch rib 2 includes an outer web b2.1, an inner web b2.2, a top plate b2.3, and a bottom plate b2.4; the two long sides of the top plate b2.3 are respectively fixedly connected to the top edge of the outer web b2.1 and the top edge of the inner web b2.2, and the two long sides of the bottom plate b2.4 are respectively fixedly connected to the bottom edge of the outer web b2.1 and the bottom edge of the inner web b2.2;

[0052] The outer web a1.1 is the continuation of the first outer web 3.1, and the two are smoothly continuous throughout the length; the outer web b2.1 is the continuation of the second outer web 3.2, and the two are smoothly continuous throughout the length; the top plate a1.3 is the continuation of the first top plate 3.4, and the two are smoothly continuous throughout the length; the top plate b2.3 is the continuation of the second top plate 3.5, and the two are smoothly continuous throughout the length; the bottom plate a1.4 is the continuation of the first bottom plate 3.6, and the two are smoothly continuous throughout the length; the bottom plate b2.4 is the continuation of the second bottom plate 3.7, and the two are smoothly continuous throughout the length.

[0053] The inner web a1.2 and the middle web 3.3, as well as the inner web b2.2 and the middle web 3.3 are connected by full penetration butt welding.

[0054] A plurality of first transverse partitions 3.8 and second transverse partitions 3.9 are arranged in the combined arch rib 3, and the positions of the first transverse partitions 3.8 and the second transverse partitions 3.9 correspond to the middle web 3.3 of the combined arch rib 3; the four sides of the first transverse partition 3.8 are respectively fixedly connected to the inner side surfaces of the first outer web 3.1, the middle web 3.3, the first top plate 3.4 and the first bottom plate 3.6; the four sides of the second transverse partition 3.9 are respectively fixedly connected to the inner side surfaces of the second outer web 3.2, the middle web 3.3, the second top plate 3.5 and the second bottom plate 3.7.

[0055] A plurality of transverse partitions a1.5 are arranged in the first single-leg arch rib 1, and the four sides of the transverse partitions a1.5 are respectively fixedly connected to the inner side surfaces of the outer web a1.1, the inner web a1.2, the top plate a1.3 and the bottom plate a1.4.

[0056] A plurality of transverse partitions b2.5 are arranged in the second single-leg arch rib 2, and the four sides of the transverse partitions b2.5 are respectively fixedly connected to the inner side surfaces of the outer web b2.1, the inner web b2.2, the top plate b2.3 and the bottom plate b2.4.

[0057] Manholes are arranged at the centers of the first transverse partition 3.8, the second transverse partition 3.9, the transverse partition a1.5 and the transverse partition b2.5.

[0058] The inner walls of the combined arch rib 3, the first single-limb arch rib 1 and the second single-limb arch rib 2 are provided with a plurality of longitudinal stiffening ribs 4 at intervals, and the longitudinal stiffening ribs 4 are all kept continuous throughout the entire length.

[0059] The first transverse partition 3.8, the second transverse partition 3.9, the transverse partition a1.5 and the transverse partition b2.5 are provided with through holes for the longitudinal stiffening ribs 4 to pass through.

[0060] At the first end of the merged rib 3, the thickness of the middle web 3.3 is locally thickened to be slightly greater than the sum of the thicknesses of the inner web a1.2 and the inner web b2.2.

[0061] Embodiment 2

[0062] This embodiment provides a construction method for a forked steel box arch rib, which is used to install the forked steel box arch rib in the above embodiment, and the method includes:

[0063] The first step is cutting steel materials: the pre-treated steel plates are cut and edge-processed according to the component plates to form the first outer web 3.1, the second outer web 3.2, the middle web 3.3, the first top plate 3.4, the second top plate 3.5, the first bottom plate 3.6, the second bottom plate 3.7, the outer web a1.1, the inner web a1.2, the top plate a1.3, the bottom plate a1.4, the outer web b2.1, the inner web b2.2, the top plate b2.3, the bottom plate b2.4, the longitudinal stiffening rib 4, the first transverse diaphragm 3.8, the second transverse diaphragm 3.9, the transverse diaphragm a1.5, and the transverse diaphragm b2.5 of the set shapes and sizes.

[0064] Step 2: Plate assembly: First, weld the longitudinal stiffening rib 4 to the corresponding mother plate, and leave a 300mm embedded section at the connection position of the inner web a1.2, inner web b2.2 and the middle web 3.3. Then, complete the butt welding connection of the inner web a1.2, inner web b2.2 and the middle web 3.3, open grooves at the ends of the inner web a1.2 and inner web b2.2, and set a ceramic liner in the gap between them. By adopting a single-sided welding and double-sided forming welding process, the full penetration butt connection of the inner web a1.2, inner web b2.2 and the middle web 3.3 is achieved.

[0065] Afterwards, place the first continuous bottom plate 3.6 and bottom plate a1.4, the second continuous bottom plate 3.7 and bottom plate b2.4 on the tire frame, connect them into an integral inner web a1.2, inner web b1.2 and middle web 3.3, and complete the welding connection between the above-mentioned plates, and then weld the first continuous outer web 3.1 and outer web a1.1, the second continuous outer web 3.2 and outer web b2.1, the first transverse partition 3.8, the second transverse partition 3.9, the transverse partition a1.5, the transverse partition b2.5 in sequence according to the set position, and finally assemble the first continuous top plate 3.4 and top plate a1.3 and the second continuous top plate 3.5 and top plate b2.3.

[0066] The third step is overall hoisting. After welding is completed, anti-corrosion painting is carried out before overall hoisting.

[0067] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A bifurcated steel box arch rib, characterized in that: include: A combined rib having a first end and a second end; a first single-limbed rib having a first end and a second end; A second single-limbed arch rib has a first end and a second end, wherein a first gap is provided between the first end of the first single-limbed arch rib and the first end of the second single-limbed arch rib; The second end of the first single-limb arch rib and the second end of the second single-limb arch rib are both fixedly connected to the first end of the combined arch rib, a second gap is provided between the second end of the first single-limb arch rib and the second end of the second single-limb arch rib, and the first gap is larger than the second gap; The combined arch rib comprises a first outer web, a second outer web, a middle web, a first top plate, a second top plate, a first bottom plate, and a second bottom plate; the two long sides of the first top plate are respectively fixedly connected to the top side of the first outer web and the top side of the middle web, the two long sides of the first bottom plate are respectively fixedly connected to the bottom side of the first outer web and the bottom side of the middle web, the two long sides of the second top plate are respectively fixedly connected to the top side of the second outer web and the top side of the middle web, and the two long sides of the second bottom plate are respectively fixedly connected to the bottom side of the second outer web and the bottom side of the middle web; The first single-limb arch rib comprises an outer web a, an inner web a, a top plate a, and a bottom plate a, wherein two long sides of the top plate a are respectively fixedly connected to the top edge of the outer web a and the top edge of the inner web a, and two long sides of the bottom plate a are respectively fixedly connected to the bottom edge of the outer web a and the bottom edge of the inner web a; The second single-leg arch rib comprises an outer web b, an inner web b, a top plate b, and a bottom plate b, wherein two long sides of the top plate b are respectively fixedly connected to the top edge of the outer web b and the top edge of the inner web b, and two long sides of the bottom plate b are respectively fixedly connected to the bottom edge of the outer web b and the bottom edge of the inner web b; The outer web a is a continuation of the first outer web, and the two are smoothly continuous throughout the length; the outer web b is a continuation of the second outer web, and the two are smoothly continuous throughout the length; the top plate a is a continuation of the first top plate, and the two are smoothly continuous throughout the length; the top plate b is a continuation of the second top plate, and the two are smoothly continuous throughout the length; the bottom plate a is a continuation of the first bottom plate, and the two are smoothly continuous throughout the length; the bottom plate b is a continuation of the second bottom plate, and the two are smoothly continuous throughout the length; The inner web a and the middle web, as well as the inner web b and the middle web are connected by full penetration butt welding.

2. The bifurcated steel box arch rib according to claim 1, characterized in that: A plurality of first transverse partitions and a plurality of second transverse partitions are arranged in the merged arch rib, and the positions of the first transverse partitions and the second transverse partitions correspond to each other along the middle web; the four sides of the first transverse partition are respectively fixedly connected to the inner sides of the first outer web, the middle web, the first top plate and the first bottom plate; the four sides of the second transverse partition are respectively fixedly connected to the inner sides of the second outer web, the middle web, the second top plate and the second bottom plate.

3. The bifurcated steel box arch rib according to claim 2, characterized in that: A plurality of transverse diaphragms a are arranged in the first single-limb arch rib, and the four sides of the transverse diaphragms a are respectively fixedly connected to the inner side surfaces of the outer web a, the inner web a, the top plate a and the bottom plate a; A plurality of transverse partitions b are arranged in the second single-leg arch rib, and the four sides of the transverse partitions b are respectively fixedly connected to the inner side surfaces of the outer web b, the inner web b, the top plate b and the bottom plate b.

4. The bifurcated steel box arch rib according to claim 3, characterized in that: The inner walls of the combined arch rib, the first single-limb arch rib and the second single-limb arch rib are provided with a plurality of longitudinal stiffening ribs at intervals, and the longitudinal stiffening ribs are all kept continuous throughout the entire length.

5. The bifurcated steel box arch rib according to claim 4, characterized in that: The centers of the first transverse partition, the second transverse partition, the transverse partition a and the transverse partition b are all provided with manholes; The first transverse partition, the second transverse partition, the transverse partition a and the transverse partition b are provided with through holes for the longitudinal stiffening ribs to pass through.

6. The bifurcated steel box arch rib according to claim 5, characterized in that: The thickness of the middle web at the first end of the merged rib is locally thickened to be greater than the sum of the thicknesses of the inner web a and the inner web b.

7. A construction method for a bifurcated steel box arch rib, used for installing a bifurcated steel box arch rib according to any one of claims 1 to 6, the method comprising: 1) Steel blanking: The pre-treated steel plates are blanked and edge-processed according to the component plates to form the first outer web, the second outer web, the middle web, the first top plate, the second top plate, the first bottom plate, the second bottom plate, the outer web a, the inner web a, the top plate a, the bottom plate a, the outer web b, the inner web b, the top plate b, the bottom plate b, the longitudinal stiffening ribs, the first diaphragm, the second diaphragm, the diaphragm a, and the diaphragm b of the set shapes and sizes; 2) Plate assembly: First, weld the longitudinal stiffening ribs to the corresponding mother plate, and leave a 300mm embedded section at the connection position of the inner web a, inner web b and the middle web; then complete the butt welding connection of the inner web a, inner web b and the middle web, open grooves at the ends of the inner web a and inner web b, and set a ceramic liner in the gap between them. By adopting a single-sided welding and double-sided forming welding process, the inner web a, inner web b and the middle web are fully melted and butt-connected; Then, the first continuous bottom plate and bottom plate a, the second continuous bottom plate and bottom plate b are placed on the tire frame, and the inner web plate a, the inner web plate b and the middle web plate are connected to form an integral whole, and the welding connection between the above plates is completed, and then the first continuous outer web plate and the outer web plate a, the second continuous outer web plate and the outer web plate b, the first diaphragm, the second diaphragm, the diaphragm a, and the diaphragm b are welded in sequence according to the set position, and finally the first continuous top plate and the top plate a, and the second continuous top plate and the top plate b are assembled; 3) Overall lifting: After the panels are assembled, they are painted with anti-corrosion paint and then hoisted as a whole.

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