Through arch bridge structure suitable for overpass expressway and construction method of through arch bridge structure

Abstract

The through arch bridge structure comprises a steel box main longitudinal beam and a main arch structure, the top face of the steel box main longitudinal beam is connected with the main arch structure, the steel box main longitudinal beam adopts a box-shaped section, a transverse partition plate is arranged in the box, and the transverse partition plate and the transverse partition plate are connected through a steel transverse beam; shear nails are arranged on the top faces of the steel cross beams, prefabricated concrete bridge deck slabs are placed on the top faces of the steel cross beams, and wet joints between the prefabricated concrete bridge deck slabs are poured, so that bonding of cast-in-place concrete wet joints and the shear nails is achieved, connection between longitudinal sections of the prefabricated concrete bridge deck slabs is completed, and connection between the prefabricated concrete bridge deck slabs and the steel cross beams is achieved. According to the prefabricated concrete bridge deck, the prefabricated concrete bridge deck is not combined with the steel box main longitudinal beam and only forms a combined section with the steel cross beam, it is guaranteed that the suspender has enough anchoring space, the stress influence of shrinkage and creep of the concrete bridge deck on the steel box main longitudinal beam structure is reduced, the stress of the concrete bridge deck is simplified into a longitudinal one-way plate, and the stress is simpler.

Description

Technical Field

[0001] The invention relates to the field of intersections and spans between local roads and expressways, and in particular to an under-supported arch bridge structure suitable for crossing expressways and a construction method thereof. Background Art

[0002] The construction of expressways often blocks the passage of existing local roads. In order to ensure the passage function of local roads, the minimum clearance of ≥5.0m is required. When the local road is higher than the expressway, a new bridge needs to be built to cross the expressway; when the local road is lower than the expressway, a new channel can be used to pass under the expressway. This application is mainly aimed at the situation where local roads use overpasses to cross the expressway. When a new bridge is built on an operating expressway, the spanning capacity of conventional concrete bridge structures is limited, and piers are often required to be arranged in the median strip of the expressway. During construction, the inner lanes of the expressway need to be closed to facilitate the construction of the bridge substructure. The construction period is long, the interference effect on the expressway is large, and the construction safety risk is high. After the opening to traffic, the piers may also become risk points for being hit. It is necessary to consider the anti-collision design of the piers arranged in the median strip; moreover, conventional concrete bridge structures may only consider the use function and ignore the aesthetics of the bridge. The constructed overpass has poor landscape effect, which brings visual fatigue to drivers traveling on the expressway. In addition, the aforementioned piers arranged in the median strip increase the safety hazards of expressway operations. However, in order to solve the problem of connecting the concrete bridge deck with the main longitudinal beam of the steel structure, the current method is to set shear nails on the top surfaces of the left and right main longitudinal beams to achieve the joint cross-sectional force between the concrete bridge deck and the main longitudinal beams. This method will increase the force on the main longitudinal beam of the steel structure due to the shrinkage creep of the concrete, and the structural force will be more complicated. In addition, the layout space of the concrete bridge deck will overlap with the layout space of the ear plate of the hanger, so the ear plate of the hanging point needs to be set on the top surface of the outermost web, which will also have a certain adverse effect on the overall force of the whole bridge. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a bottom-supported arch bridge structure suitable for crossing over expressways, that is, a single-span span bridge structure without piers arranged in the median strip of the expressway, a bottom-supported new arch bridge with a steel box main longitudinal beam and a steel box main arch, a hanger is arranged between the main arch and the main beam to achieve connection, and the bridge deck adopts a steel-concrete composite beam structure to solve the problem of fatigue cracking of orthogonal anisotropic steel bridge panels; at the same time, in order to simplify the force, the concrete bridge panel is not combined with the steel box main longitudinal beam, and only forms a joint section with the steel cross beam; the steel box main longitudinal beam, the steel cross beam, and the main arch structure are prefabricated in sections and then hoisted and installed on site. During the construction, a total of 3 temporary supports are set up to close half of the expressway for traffic and divert to the other half for two-way traffic, thereby reducing the construction difficulty and construction safety risks, shortening the construction period, and improving safety.

[0004] Another object of the present invention is to provide a construction method for a bottom-supported arch bridge structure suitable for crossing an expressway. The use of a bridge structure that is both functional and aesthetically pleasing can not only shorten the construction period of the bridge structure and reduce the impact on the expressway's traffic during construction, but also completely avoid the anti-collision problem caused by the arrangement of bridge piers in the median strip, thereby improving the safety of expressway traffic and the overall landscape, adding scenery to drivers and passengers traveling on the expressway, making the traffic more colorful, and better reflecting the humanized design and highlighting the social value.

[0005] The object of the present invention can be achieved through the following technical scheme: a bottom-supported arch bridge structure suitable for crossing a highway, comprising a bridge substructure, the top surface of the bridge substructure is provided with a support system, the top surface of the support system is provided with a steel box main longitudinal beam and a main arch structure, the top surface of the steel box main longitudinal beam is connected to the main arch structure, the steel box main longitudinal beam adopts a box-shaped section, a cross partition is provided in the box, and the transverse sections are connected by a steel cross beam; the top surface of the steel cross beam is provided with shear nails, and precast concrete bridge panels are placed, and the wet joints between the precast concrete bridge panels are cast to achieve bonding of the cast-in-place concrete wet joints with the shear nails and complete the connection between the longitudinal sections of the precast concrete bridge panels, thereby realizing the connection between the precast concrete bridge panels and the steel cross beams.

[0006] From the above, a single-span bridge structure is adopted in which bridge piers are not arranged in the median strip of the highway, so as to completely avoid the anti-collision problem caused by the arrangement of bridge piers in the median strip; the bridge deck adopts a steel-concrete composite beam structure to solve the problem of fatigue cracking of orthogonal anisotropic steel bridge decks, and the precast concrete bridge deck is not combined with the steel box main longitudinal beam, but only forms a joint section with the steel cross beam, so that the hanger can be centrally arranged on the top surface of the main longitudinal beam, which not only ensures that the hanger has sufficient anchoring space, but also reduces the stress influence of the shrinkage creep of the concrete bridge deck on the steel box main longitudinal beam structure. The stress of the concrete bridge deck is simplified to a longitudinal one-way plate, and its stress is simpler.

[0007] Optionally, the steel box main longitudinal beam includes a left steel box main longitudinal beam and a right steel box main longitudinal beam, the main arch structure includes a left main arch structure and a right main arch structure, the top surface of the left steel box main longitudinal beam is connected to the left main arch structure, and the top surface of the right steel box main longitudinal beam is connected to the right main arch structure.

[0008] Optionally, the steel cross beam includes an end cross beam and a middle cross beam, the end cross beam adopts a box-shaped section, the middle cross beam adopts an "I"-shaped section, and the standard longitudinal spacing is 3m; the steel cross beam corresponds one-to-one to the position of the cross partitions in the left steel box main longitudinal beam and the right steel box main longitudinal beam.

[0009] Optionally, the top surfaces of the left and right steel box main longitudinal beams are provided with steel box main longitudinal beam hanging point ear plates, and the longitudinal spacing of the steel box main longitudinal beam hanging point ear plates is 6m, corresponding to the longitudinal partitions arranged in the left and right steel box main longitudinal beams to realize force transmission.

[0010] Furthermore, the bottom surfaces of the left main arch structure and the right main arch structure are provided with main arch structure hanging point ear plates, and the longitudinal spacing of the main arch structure hanging point ear plates is 6m, corresponding to the longitudinal partitions arranged in the left main arch structure and the right main arch structure boxes to realize force transmission.

[0011] Furthermore, the lifting point ear plate on the main longitudinal beam of the steel box and the lifting point ear plate on the main arch structure are both provided with three lifting point holes, and the three lifting point holes correspond to each other one by one.

[0012] Furthermore, the lug plate at the hanging point on the main longitudinal beam of the steel box is connected to the lug plate at the hanging point on the main arch structure through a suspension rod.

[0013] Optionally, inspection railings and steps are provided on both sides of the top plates of the box-shaped sections of the left and right steel box main longitudinal beams, and inspection railings and steps are provided on both sides of the top plates of the box-shaped sections of the left and right main arch structures.

[0014] Optionally, the left main arch structure and the right main arch structure are laterally connected by two transverse braces.

[0015] Accordingly, the present invention also claims protection for a construction method of the aforementioned through-arch bridge structure suitable for overpassing a highway, wherein a total of three temporary supports are provided during the construction, and the method comprises the following steps:

[0016] S1. When the left half is closed for construction, two temporary brackets are set up and laid on the hard shoulder of the left side and the median strip of the highway. The road is diverted to the right half for two-way traffic. The main longitudinal beam and steel cross beam of the left half are hoisted and installed. A temporary bracket of the main arch structure is set on the main longitudinal beam of the left half, and the position corresponds to the temporary bracket of the main longitudinal beam of the steel box. Then the main arch structure of the left half is hoisted and installed.

[0017] S2. Remove the temporary support of the left hard shoulder, divert the traffic to the left half for two-way traffic, install the temporary support of the right hard shoulder, complete the hoisting and installation of the main longitudinal beam and steel cross beam of the right half steel box, and similarly set the temporary support of the main arch structure on the main longitudinal beam structure of the right half, and hoist and install the main arch structure of the right half;

[0018] S3, remove the temporary supports of the main arch structure, complete the installation and tensioning of the hanger, and finally remove the temporary supports set up on the median strip and the right hard shoulder of the expressway to complete the system conversion;

[0019] S4. Sequentially hoist and install precast concrete bridge panels, cast wet joints between precast concrete bridge panels, achieve connection between longitudinal sections of precast concrete bridge panels, achieve combination of precast concrete bridge panels and steel cross beams, and finally complete the construction of bridge anti-collision guardrails and bridge deck paving.

[0020] From the above, after the completion of the aforementioned beam-arch system, all temporary supports are removed and then the concrete bridge deck and bridge deck system are constructed. The self-weight of the concrete bridge deck and the second-phase constant load of the bridge deck system are applied to the beam-arch system. In this way, the entire bridge becomes a steel beam-steel arch structure, avoiding the situation of steel beam-flexible arch or flexible beam-steel arch. The main longitudinal beam and the main arch are more coordinated in force, and the structural dimensions are basically the same. The appearance of the bridge structure is coordinated and unified, and the structural rhythm is more beautiful. The bridge deck system adopts a steel-concrete composite beam structure to avoid the fatigue cracking problem of orthogonal anisotropic steel bridge decks. Combined with the one-span bottom-supported arch bridge structure using the aforementioned construction plan, it can reduce the construction difficulty and construction safety risks, shorten the construction period, and improve safety.

[0021] Compared with the prior art, the present invention has at least the following effects:

[0022] 1. The present invention adopts a bottom-supported arch bridge structure in which bridge piers are not arranged in the median strip of the expressway. During the construction period, a total of three temporary supports are arranged to close the traffic on half of the expressway and divert the traffic to the other half in both directions, thereby shortening the construction period of the bridge structure and reducing the impact on the traffic maintenance of the expressway during the construction period. The anti-collision problem caused by the arrangement of bridge piers in the median strip is completely avoided, the safety of the expressway traffic and the overall landscape are improved, the scenery is added to the drivers and passengers traveling on the expressway, the traffic becomes more colorful, and the humanized design is better reflected and the social value is highlighted.

[0023] 2. The present invention adopts an under-supported arch bridge structure in which piers are not arranged in the median strip of the expressway. The concrete bridge deck and the bridge surface are constructed after the beam-arch system is completed and all temporary supports are removed. The entire bridge becomes a steel beam-steel arch structure, avoiding the occurrence of steel beam-flexible arch or flexible beam-steel arch. The main longitudinal beam and the main arch are subjected to more coordinated forces, so the structural dimensions are basically the same. The appearance of the bridge structure is coordinated and unified, and the structural rhythm is more beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 It is the three-dimensional elevation layout drawing of the bottom-supported arch bridge structure;

[0026] Figure 2 This is the elevation layout of the through-arch bridge structure;

[0027] Figure 3 This is the top plan layout of the through-arch bridge structure;

[0028] Figure 4 This is the bottom plan layout of the through-arch bridge structure;

[0029] Figure 5 This is a cross-sectional view of a through-arch bridge structure;

[0030] Figure 6 Layout drawing for construction stage 1;

[0031] Figure 7 Layout drawing for construction stage 2;

[0032] Figure 8 Layout drawing for construction stage 3;

[0033] Fig. 9 Layout drawings for construction stage 4;

[0034] Fig.10 This is the bridge layout diagram of the bottom-supported arch bridge structure.

[0035] Description of reference numerals:

[0036] 1-1, bridge substructure, 1-2, support system, 2-1, left steel box main longitudinal beam, 2-2, right steel box main longitudinal beam, 3-1, left main arch structure, 3-2, right main arch structure, 4-1, end cross beam, 4-2, middle cross beam, 5-cross brace, 6-steel box main longitudinal beam upper hanging point ear plate, 7-main arch structure upper hanging point ear plate, 8-hanging rod, 9-precast concrete bridge deck, 10-shear nail, 11-anti-collision guardrail, 12-bridge deck pavement, 1 3-1, temporary support for the hard shoulder of the left span, 13-2, temporary support for the center dividing strip, 13-3, temporary support for the hard shoulder of the right span, 14-1, temporary support for the main arch structure of the left span, 14-2, temporary support for the main arch structure of the center dividing strip, 14-3, temporary support for the main arch structure of the right span, 15-1, the left span of the existing expressway, 15-2, the right span of the existing expressway, 16-maintenance railings and steps on the main longitudinal beam of the steel box, 17-maintenance railings and steps on the main arch structure. DETAILED DESCRIPTION

[0037] In order to facilitate ordinary technicians in the field to understand and implement the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] Example 1

[0039] A through-type arch bridge structure suitable for crossing a highway, such as Figures 1 to 5As shown, it includes a bridge substructure 1-1, a support system 1-2 is arranged on the top surface of the bridge substructure 1-1, a steel box main longitudinal beam and a main arch structure are arranged on the top surface of the support system 1-2, and the steel box main longitudinal beam and the main arch structure are prefabricated in advance according to sections with the median strip of the expressway as the boundary.

[0040] like Figure 1 , Figure 3 , Figure 4 As shown, the steel box main longitudinal beams include a left steel box main longitudinal beam 2-1 and a right steel box main longitudinal beam 2-2. Both the left steel box main longitudinal beam 2-1 and the right steel box main longitudinal beam 2-2 adopt box-shaped sections, and a transverse partition is arranged in the box. The steel transverse beams are connected horizontally by steel beams. The steel beams include end beams 4-1 and middle beams 4-2. The end beams 4-1 are arranged at both ends of the bridge. A force-transmitting support system 1-2 is arranged at the bottom of the end beams 4-1. Except for the end beams 4-1, the rest are middle beams 4-2. The end beams 4-1 adopt a box-shaped section to facilitate force transmission at the supporting position, and the middle beams 4-2 adopt an "I"-shaped section. The standard longitudinal spacing is 3m, and the steel beams correspond to the positions of the transverse partitions in the steel box main longitudinal beams.

[0041] like Figure 1 , Figure 2 , Figure 5 As shown, the main arch structure includes a left main arch structure 3-1 and a right main arch structure 3-2. Both the left main arch structure 3-1 and the right main arch structure 3-2 adopt box-shaped sections, and a transverse partition is arranged inside the box. The top surface of the left steel box main longitudinal beam 2-1 is connected to the left main arch structure 3-1, and the top surface of the right steel box main longitudinal beam 2-2 is connected to the right main arch structure 3-2. The left main arch structure 3-1 and the right main arch structure 3-2 are laterally connected by two transverse braces 5 to improve the stability of the main arch structure.

[0042] like Figure 2 As shown, the top surfaces of the left steel box main longitudinal beam 2-1 and the right steel box main longitudinal beam 2-2 are provided with steel box main longitudinal beam upper hanging point ear plates 6, and the longitudinal spacing of the steel box main longitudinal beam upper hanging point ear plates 6 is 6m, corresponding to the longitudinal partitions (orthogonal to the transverse partitions) arranged in the steel box main longitudinal beam box to achieve force transmission, and the steel box main longitudinal beam upper hanging point ear plates 6 are provided with 3 hanging point holes, the middle one is a permanent hanging point hole, and the two sides are spare holes set for replacing the hanger during the later maintenance period.

[0043] like Figure 2As shown, the bottom surfaces of the left main arch structure 3-1 and the right main arch structure 3-2 are provided with main arch structure upper hanging point ear plates 7, and the longitudinal spacing of the main arch structure upper hanging point ear plates 7 is 6m, corresponding to the longitudinal partitions (orthogonal to the transverse partitions) arranged in the main arch structure box to realize force transmission, and the main arch structure upper hanging point ear plates 7 are provided with 3 hanging point holes, and are in a one-to-one correspondence with the hanging point ear plates 6 on the main longitudinal beams of the steel box, that is, the hanging point ear plates 6 on the main longitudinal beams of the steel box are connected with the main arch structure upper hanging point ear plates 7 by setting a suspension rod 8.

[0044] In the present invention, the three hanging point holes are arranged on the hanging point ear plate 6 on the main longitudinal beam of the steel box and the hanging point ear plate 7 on the main arch structure. The middle one is a hanging point hole for permanent use, and the two sides are spare holes arranged for replacing the hanging rod during the later maintenance period. This avoids the need to subdivide each hanging point position into two hanging rods in the conventional double hanging rod structure, simplifies the local structure of the hanging point ear plate, and reduces the workload of replacing the hanging rod during maintenance.

[0045] like Figure 5 As shown, shear nails 10 are arranged on the top surfaces of the end cross beams 4-1 and the middle cross beams 4-2, and precast concrete bridge panels 9 are placed. The concrete bridge panels are precast in advance and then hoisted into place. Post-cast wet joints are arranged between the concrete bridge panels. By casting the wet joints between the precast concrete bridge panels 9, the wet joints of the cast-in-place concrete are bonded to the shear nails 10 on the top surfaces of the steel cross beams, the connection between the longitudinal sections of the precast concrete bridge panels 9 is completed, and the combination of the precast concrete bridge panels 9 with the end cross beams 4-1 and the middle cross beams 4-2 is realized.

[0046] like Figure 5 As shown, the top plates of the box-shaped sections of the left steel box main longitudinal beam 2-1 and the right steel box main longitudinal beam 2-2 are provided with inspection railings and steps 16 on the main longitudinal beams, and the top plates of the box-shaped sections of the left main arch structure 3-1 and the right main arch structure 3-2 are provided with inspection railings and steps 17 on the main arch structures, so as to ensure the safety of the maintenance personnel in the later stage.

[0047] In this embodiment, the precast concrete bridge deck 9 is not combined with the left steel box main longitudinal beam 2-1 and the right steel box main longitudinal beam 2-2, but only forms a joint section with the end cross beam 4-1 and the middle cross beam 4-2. This not only ensures that the hanger 8 has sufficient anchoring space, but also reduces the impact of the shrinkage creep of the concrete bridge deck on the stress of the steel box main longitudinal beam structure. The stress of the concrete bridge deck is simplified to a longitudinal one-way plate, and its stress is simpler.

[0048] Example 2

[0049] This is a specific application example of the bottom-supported arch bridge structure suitable for crossing a highway as described in Example 1 of the present invention.

[0050] The existing expressway currently has four lanes in both directions and needs to be transformed into eight lanes in both directions. The width of the roadbed after the transformation is 41.5m. A bottom-supported arch bridge structure without piers in the median strip of the expressway is adopted. During the construction period, a total of three temporary supports are set up, namely, temporary support 13-1 for the left hard shoulder, temporary support 13-2 for the median strip, and temporary support 13-3 for the right hard shoulder. The specific construction steps are as follows:

[0051] Stage 1, such as Figure 6 As shown, when the left section 15-1 of the existing expressway is closed for construction, temporary supports 13-1 for the hard shoulder of the left section and temporary supports 13-2 for the center dividing strip are set, and the road is diverted to the right section 15-2 of the existing expressway for two-way traffic. First, the main longitudinal beams and steel cross beams of the left half of the expressway are hoisted and installed, and temporary supports 14-1 for the main arch structure of the left section and temporary supports 14-2 for the main arch structure of the center dividing strip (whose positions correspond to the temporary supports for the main longitudinal beams of the steel box) are set on the main longitudinal beams of the left half of the expressway, and then the main arch structure of the left half of the expressway is hoisted and installed.

[0052] Stage 2, such as Figure 7 As shown, the temporary support 13-1 for the left hard shoulder is removed, and the traffic is diverted to the left section 15-1 of the existing expressway for two-way traffic. The temporary support 13-3 for the right hard shoulder is installed on the right section 15-2 of the existing expressway, and the hoisting and installation of the right half steel box main longitudinal beam and steel cross beam are completed. Similarly, the temporary support 14-3 for the right main arch structure is set on the right half main longitudinal beam structure, and the right half main arch structure is hoisted and installed.

[0053] Stage 3, such as Figure 8 As shown, the temporary support 14-1 of the left main arch structure, the temporary support 14-2 of the center strip main arch structure and the temporary support 14-3 of the right main arch structure are removed, the installation and tensioning of the hanger 8 are completed, and finally the temporary support 13-2 of the center strip and the temporary support 13-3 of the right hard shoulder are removed to complete the system conversion.

[0054] Stage 4, such as Fig. 9 As shown, the precast concrete bridge deck 9 is hoisted and installed in sequence, the wet joints between the precast concrete bridge decks 9 are cast, the wet joints of the cast-in-place concrete are bonded to the shear nails 10 on the top surface of the steel beam, the connection between the longitudinal segments of the bridge deck is completed, and the combination of the bridge deck and the steel beam is realized; finally, the construction of the bridge anti-collision guardrail 11 and the bridge deck pavement 12 is completed.

[0055] like Fig.10 As shown, the existing highway is transformed from a two-way 4-lane highway to a two-way 8-lane highway, and a single-span bottom-supported arch bridge structure is used to cross the existing highway.

[0056] In the present invention, the main longitudinal beam and main arch structure of the steel box are prefabricated in sections and then hoisted and installed on site. After the beam-arch system is completed, all temporary supports are removed and then the concrete bridge deck and bridge deck system are constructed. The dead weight of the concrete bridge deck and the second-phase constant load of the bridge deck system are applied to the beam-arch system. The whole bridge becomes a steel beam-steel arch structure, avoiding the situation of steel beam-flexible arch or flexible beam-steel arch. The main longitudinal beam and the main arch are more coordinated in force, the structural dimensions are basically the same, the appearance of the bridge structure is coordinated and unified, the structural rhythm is more beautiful, and the construction difficulty and construction safety risks can be reduced, the construction period can be shortened, and the safety can be improved.

[0057] It should be understood that the above description of the preferred embodiment is relatively detailed and cannot be regarded as limiting the scope of patent protection of the present invention. Under the enlightenment of the present invention, ordinary technicians in this field can also make substitutions or modifications without departing from the scope of protection of the claims of the present invention, which all fall within the scope of protection of the present invention. The scope of protection requested for the present invention shall be based on the attached claims.

Claims

1. A through-type arch bridge structure suitable for crossing a highway, comprising a bridge substructure, a support system is arranged on the top surface of the bridge substructure, a steel box main longitudinal beam and a main arch structure are arranged on the top surface of the support system, and the characteristics are: The top surface of the steel box main longitudinal beam is connected to the main arch structure. The steel box main longitudinal beam adopts a box-shaped section. A cross partition is arranged inside the box, and the transverse sections are connected by steel cross beams. Shear nails are arranged on the top surface of the steel cross beam, and precast concrete bridge panels are placed thereon. The wet joints between the precast concrete bridge panels are poured to achieve bonding between the cast-in-place concrete wet joints and the shear nails and complete the connection between the longitudinal sections of the precast concrete bridge panels, thereby realizing the connection between the precast concrete bridge panels and the steel cross beams.

2. The through arch bridge structure suitable for crossing a highway according to claim 1, characterized in that: The steel box main longitudinal beam includes a left steel box main longitudinal beam and a right steel box main longitudinal beam, the main arch structure includes a left main arch structure and a right main arch structure, the top surface of the left steel box main longitudinal beam is connected to the left main arch structure, and the top surface of the right steel box main longitudinal beam is connected to the right main arch structure.

3. The through arch bridge structure suitable for crossing a highway according to claim 1, characterized in that: The steel cross beams include end cross beams and middle cross beams. The end cross beams adopt a box-shaped section, and the middle cross beams adopt an "I"-shaped section. The standard longitudinal spacing is 3m. The steel cross beams correspond one-to-one to the positions of the cross partitions in the left steel box main longitudinal beam and the right steel box main longitudinal beam.

4. The through arch bridge structure suitable for crossing a highway according to claim 2, characterized in that: The top surfaces of the left and right steel box main longitudinal beams are provided with steel box main longitudinal beam hanging point ear plates, and the longitudinal spacing of the steel box main longitudinal beam hanging point ear plates is 6m, corresponding to the longitudinal partitions arranged in the left and right steel box main longitudinal beams to realize force transmission.

5. The through arch bridge structure suitable for crossing a highway according to claim 4, characterized in that: The bottom surfaces of the left main arch structure and the right main arch structure are provided with main arch structure upper hanging point ear plates, and the longitudinal spacing of the main arch structure upper hanging point ear plates is 6m, corresponding to the longitudinal partitions arranged in the left main arch structure and the right main arch structure boxes to realize force transmission.

6. The through arch bridge structure suitable for crossing a highway according to claim 5, characterized in that: The lifting point ear plate on the main longitudinal beam of the steel box and the lifting point ear plate on the main arch structure are both provided with three lifting point holes, and the three lifting point holes correspond to each other one by one.

7. The through arch bridge structure suitable for crossing a highway according to claim 6, characterized in that: The lug plates on the main longitudinal beams of the steel box and the lug plates on the main arch structures are connected via suspension rods.

8. The through arch bridge structure suitable for crossing a highway according to claim 2, characterized in that: Inspection railings and steps are arranged on both sides of the top plates of the box-shaped sections of the left and right steel box main longitudinal beams, and inspection railings and steps are arranged on both sides of the top plates of the box-shaped sections of the left and right main arch structures.

9. The through arch bridge structure suitable for crossing a highway according to claim 2, characterized in that: The left main arch structure and the right main arch structure are laterally connected by two cross braces.

10. A construction method for a through arch bridge structure suitable for crossing a highway according to any one of claims 1 to 9, characterized in that: A total of 3 temporary supports were set up during the construction period, including the following steps: S1. When the left half is closed for construction, two temporary brackets are set up and laid on the hard shoulder of the left side and the median strip of the highway. The road is diverted to the right half for two-way traffic. The main longitudinal beam and steel cross beam of the left half are hoisted and installed. A temporary bracket of the main arch structure is set on the main longitudinal beam of the left half, and the position corresponds to the temporary bracket of the main longitudinal beam of the steel box. Then the main arch structure of the left half is hoisted and installed. S2. Remove the temporary support of the left hard shoulder, divert the traffic to the left half for two-way traffic, install the temporary support of the right hard shoulder, complete the hoisting and installation of the main longitudinal beam and steel cross beam of the right half steel box, and similarly set the temporary support of the main arch structure on the main longitudinal beam structure of the right half, and hoist and install the main arch structure of the right half; S3, remove the temporary supports of the main arch structure, complete the installation and tensioning of the hanger, and finally remove the temporary supports set up on the median strip and the right hard shoulder of the expressway to complete the system conversion; S4. Sequentially hoist and install precast concrete bridge panels, cast wet joints between precast concrete bridge panels, achieve connection between longitudinal sections of precast concrete bridge panels, achieve combination of precast concrete bridge panels and steel cross beams, and finally complete the construction of bridge anti-collision guardrails and bridge deck paving.

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