A type of upper-bearing variable-width arch bridge

Abstract

This utility model provides an upper-bearing variable-width arch bridge, including an arch ring structure, a main beam structure, and two supporting structures. Each supporting structure includes a pier assembly, an arch seat, a first inclined leg assembly, and a second inclined leg assembly. The first inclined leg assembly includes multiple first inclined legs, and the second inclined leg assembly includes two second inclined legs. The first inclined legs are inclined from their bottom to their top along the longitudinal direction of the bridge towards the end away from the arch ring structure. The second inclined legs are inclined from their bottom to their top along the transverse direction of the bridge towards the end away from the first inclined legs. By setting the inclined legs, the gravity of the side span is converted into vertical and horizontal forces. The horizontal component can offset most of the horizontal thrust of the arch ring, greatly reducing the need for shear pile foundations. Conventional pile cap foundations can be used, which has good geological adaptability. The inclination of the second inclined legs along the transverse direction of the bridge can also accommodate a larger widening, improving the adaptability of the bridge to widening at the side span connection.

Description

Technical Field

[0001] This utility model relates to the field of arch bridge widening technology, and in particular to an upper-bearing variable-width arch bridge. Background Technology

[0002] Arch bridges are a traditional bridge structure, characterized by their simple and elegant design, and are commonly used in highway and municipal bridges with short spans. Urban bridges often require ramps to connect with other main roads. The main bridge needs a gradually widening deck near the connecting ramps to seamlessly integrate with the main bridge. Due to traffic constraints, widening structures inevitably extend into the main bridge under certain circumstances. However, arch bridges are less adaptable to changes in bridge width, as the arch ribs cannot be widened. For locations near intersections or at the end of roads, traditional deck-type arch bridges require overall widening of the bridge deck, arch rings, arch abutments, and foundations to accommodate the widening, resulting in poor economic efficiency and aesthetic appeal.

[0003] For arch bridges spanning urban waterways, traditional arch bridges require separate arch abutments and piers, or even if the arch abutments and piers are built together, it greatly increases the amount of work, with extensive excavation and backfilling damaging the environment. For widened bridges connecting to approach bridges, ramp transition piers are usually added at the junction of the ramps and the main bridge, with a certain angle to the main line. The space under the bridge has poor permeability and is not effective. In addition, the amount of work on the substructure and foundation of the bridge is large. Especially for upper-bearing arch bridges, the horizontal force of the widened arch abutments is difficult to offset through construction.

[0004] Therefore, it is necessary to propose an upper-bearing variable-width arch bridge to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide an upper-bearing variable-width arch bridge to solve the problems of large horizontal force at the arch seat and a large number of transition piers in the existing upper-bearing variable-width arch bridge.

[0006] To achieve the above objectives, this utility model provides an upper-bearing variable-width arch bridge, comprising an arch ring structure, a main beam structure, and two supporting structures, wherein the two supporting structures are arranged opposite to each other on both sides of the arch ring structure along the longitudinal direction of the bridge; wherein,

[0007] Each of the aforementioned support structures includes a pier assembly, an arch seat, a first inclined leg assembly, and a second inclined leg assembly. The arch seat is connected to the top of the pier assembly. The first inclined leg assembly includes multiple first inclined legs spaced apart along the transverse direction of the bridge. The second inclined leg assembly includes two second inclined legs spaced apart on either side of the first inclined leg assembly along the transverse direction of the bridge.

[0008] The two arch feet of the arch structure are respectively connected to the inner ends of the two arch seats. The bottom ends of the first and second inclined legs are both connected to the outer ends of the arch seats, and the top ends of the first and second inclined legs are both connected to the ends of the main beam structure.

[0009] The first inclined leg and the second inclined leg are each inclined along the longitudinal direction of the bridge towards the end away from the arch structure, from their bottom to their top. The second inclined leg is inclined along the transverse direction of the bridge towards the end away from the first inclined leg, from its bottom to its top.

[0010] Preferably, the arch structure includes multiple arch ribs spaced apart along the transverse direction of the bridge, with the two arch feet of each arch rib connected to the inner ends of the two arch seats respectively.

[0011] Preferably, the arch structure further includes a plurality of transverse beams spaced apart along the transverse direction of the bridge, with one transverse beam connecting each pair of adjacent arch ribs, and one transverse beam connecting the first inclined leg and the second inclined leg, and between each pair of adjacent first inclined legs.

[0012] Preferably, the inner and outer ends of the arch seat are both inclined, and the arch foot end of the arch rib is perpendicularly connected to the inner end of the arch seat, and the bottom ends of the first and second inclined legs are perpendicularly connected to the outer end of the arch seat.

[0013] Preferably, the main beam structure includes a standard section and a widened section, both of which have a bridge deck and multiple beam ribs spaced apart along the transverse direction of the bridge; wherein, the beam ribs of the standard section are connected one-to-one to the arch ribs, and the beam ribs of the widened section are connected to the first and second inclined legs, and the bridge deck is connected to the top of the beam ribs.

[0014] Preferably, it also includes a seepage-proof support wall, which is connected between the first inclined leg and the second inclined leg, and between two adjacent first inclined legs, and the wall surface of the seepage-proof support wall is designed to match the surface of the bank slope.

[0015] Preferably, the end face of the main beam structure is formed with a corbel, which is used for connecting the approach slab or the bridge after the transition pier.

[0016] Preferably, the width of each of the arch ribs is the same.

[0017] Preferably, the pier assembly includes a plurality of piers spaced apart from each other and distributed in a matrix, and the arch is connected to the top of the piers.

[0018] Preferably, the spacing between the plurality of arch ribs is 290mm to 320mm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This utility model provides an upper-bearing variable-width arch bridge, including an arch ring structure, a main beam structure, and two supporting structures. The two supporting structures are arranged opposite each other on both sides of the arch ring structure along the longitudinal direction of the bridge. Each supporting structure includes a pier assembly, an arch seat, a first inclined leg assembly, and a second inclined leg assembly. The arch seat is connected to the top of the pier assembly. The first inclined leg assembly includes multiple first inclined legs arranged at intervals along the transverse direction of the bridge. The second inclined leg assembly includes two second inclined legs arranged at intervals on both sides of the first inclined leg assembly along the transverse direction of the bridge. The two arch feet of the arch ring structure are respectively connected to the inner ends of the two arch seats. The bottom ends of the first and second inclined legs are both connected to the outer ends of the arch seats. The top ends of the first and second inclined legs are both connected to the ends of the main beam structure. The first inclined leg is inclined from its bottom end to its top end along the longitudinal direction of the bridge towards the end away from the arch ring structure. The second inclined leg is inclined from its bottom end to its top end along the transverse direction of the bridge towards the end away from the first inclined leg. By setting up inclined legs, the gravity of the side span is converted into vertical and horizontal forces. The horizontal component can offset most of the horizontal thrust of the arch ring, greatly reducing the need for shear pile foundations. Conventional pile cap foundations can be used, which has good geological adaptability. The inclination of the second inclined leg along the transverse direction of the bridge can also accommodate a large widening, improving the adaptability of the bridge to widening at the connection of the side spans. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention in the embodiment of the bank slope;

[0023] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the present invention in an embodiment of an elevated bridge;

[0024] Figure 3 This is a cross-sectional schematic diagram of the side span widening section in one embodiment of the present invention;

[0025] Figure 4 This is a schematic cross-sectional view of the standard section of the main span in one embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional schematic diagram of the arch structure of the standard section in one embodiment of the present invention;

[0027] Figure 6 This is a cross-sectional schematic diagram of the main beam structure of a standard section in one embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the horizontal cross-section of the arch seat in one embodiment of the present invention;

[0029] Figure 8 This is a plan view of the widened section in one embodiment of the present invention.

[0030] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0031] Explanation of icon numbers:

[0032] 10. Arch ring structure; 110. Arch rib; 120. Transverse tie beam; 20. Main beam structure; 210. Standard section; 220. Widened section; 230. Bridge deck; 240. Beam rib; 250. Corbel; 30. Support structure; 310. Pier column assembly; 311. Pier column; 320. Arch seat; 330. First inclined leg; 340. Second inclined leg; 40. Bank slope; 410. Anti-seepage support wall. Detailed Implementation

[0033] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0037] Please see the appendix Figure 1-8 This utility model provides an embodiment of an upper-bearing variable-width arch bridge, comprising an arch ring structure 10, a main beam structure 20, and two supporting structures 30. The two supporting structures 30 are arranged opposite to each other on both sides of the arch ring structure 10 along the longitudinal direction of the bridge. First, it should be noted that in this application, the longitudinal direction of the bridge refers to the direction along the bridge's visual path, and the transverse direction of the bridge refers to the width direction of the bridge. The specific design is as follows:

[0038] Each of the supporting structures 30 includes a pier assembly 310, an arch seat 320, a first inclined leg 330 assembly, and a second inclined leg 340 assembly. The arch seat 320 is connected to the top of the pier assembly 310. The first inclined leg 330 assembly includes multiple first inclined legs 330 spaced apart along the transverse direction of the bridge. The second inclined leg 340 assembly includes two second inclined legs 340 spaced apart on both sides of the first inclined leg 330 assembly along the transverse direction of the bridge. The two arch feet of the arch ring structure 10 are respectively connected to the inner sides of the two arch seats 320. At the end, the bottom ends of the first inclined support leg 330 and the second inclined support leg 340 are both connected to the outer end of the arch seat 320, and the top ends of the first inclined support leg 330 and the second inclined support leg 340 are both connected to the end of the main beam structure 20; wherein, the first inclined support leg 330 and the second inclined support leg 340 are each inclined in the longitudinal direction of the bridge towards the end away from the arch structure 10 from their bottom end to their top end, and the second inclined support leg 340 is inclined in the transverse direction of the bridge towards the end away from the first inclined support leg 330 from its bottom end to its top end.

[0039] Specifically, the upper-bearing variable-width arch bridge in this application includes an arch ring structure 10, a main beam structure 20, and two supporting structures 30. The arch ring structure 10 is the arch ring part of the arch bridge, and the main beam structure 20 is the bridge deck part of the arch bridge. Since this application is applied to an upper-bearing arch bridge, the arch ring structure 10 is located below the main beam structure 20, while the supporting structures 30 serve as the main supporting structure of the entire bridge. The two supporting structures 30 are arranged opposite each other on both sides of the arch ring structure 10 along the longitudinal direction of the bridge, so as to support the arch ring structure 10 and at the same time support the two ends of the main beam structure 20.

[0040] Each of the supporting structures 30 includes a pier assembly 310, an arch seat 320, a first inclined leg 330 assembly, and a second inclined leg 340 assembly. The pier assembly 310 supports the arch seat 320, and the arch seat 320 is used for connection of the arch ring structure 10 to effectively transfer the load from the arch ring structure 10 to the pier assembly 310, ensuring a reasonable load distribution. Therefore, the two arch feet of the arch ring structure 10 are respectively connected to the inner ends of the two arch seats 320, where "inner" refers to the main span side, i.e., the two... The arch seats 320 are located at one end close to each other; while the first inclined leg 330 assembly and the second inclined leg 340 assembly are used to support the end of the main beam structure 20. Therefore, the bottom ends of the first inclined leg 330 and the second inclined leg 340 respectively are connected to the outer end of the arch seat 320. Here, the outer end refers to the end of the arch seat 320 that is close to the side span, that is, the end of the two arch seats 320 that is far apart from each other. The top ends of the first inclined leg 330 and the second inclined leg 340 are connected to the end of the main beam structure 20.

[0041] The first inclined leg 330 and the second inclined leg 340 are both inclined in the longitudinal direction of the bridge, away from the end of the arch structure 10, from their bottom to their top. It should be noted that this means that the first inclined leg 330 and the second inclined leg 340 are inclined in the same longitudinal direction. Considering the uniform stress on the structure, it is preferable that the first inclined leg 330 and the second inclined leg 340 are also inclined at the same longitudinal angle. In this way, the gravity of the side span is converted into vertical and horizontal forces. The horizontal component can offset most of the horizontal thrust of the arch ring on the arch seat 320, greatly reducing the need for shear pile foundations. Conventional pile foundations can be used, which have good geological adaptability. The second inclined leg 340 is inclined in the transverse direction of the bridge, away from the end of the first inclined leg 330, from its bottom to its top. This is to adapt to the widening of the side span bridge, achieving the effect of widening the side span connection of the upper-bearing arch bridge, and improving the adaptability of the bridge to widening at the side span connection.

[0042] In a preferred embodiment of the present invention, the arch structure 10 includes a plurality of arch ribs 110 arranged at intervals along the transverse direction of the bridge, and the two arch feet of each arch rib 110 are respectively connected to the inner ends of the two arch seats 320.

[0043] It should be noted that using multiple arch ribs 110 can distribute the load to each arch rib 110, which can effectively reduce the load borne by each arch rib 110 and improve the bearing capacity of the entire arch ring. During construction, the two arch feet of each arch rib 110 are respectively set on the inner ends of the arch seats 320 of the two supporting structures 30. It is worth mentioning that, considering the uniform stress of the overall structure, the number of the first inclined legs 330 can be matched with the number of arch ribs 110 and correspondingly set along the longitudinal axis.

[0044] In a preferred embodiment of the present invention, the arch structure 10 further includes a plurality of transverse beams 120 spaced apart along the transverse bridge direction. A transverse beam 120 is connected between each two adjacent arch ribs 110, and a transverse beam 120 is connected between the first inclined leg 330 and the second inclined leg 340, and between each two adjacent first inclined legs 330.

[0045] It should be noted that the transverse beams 120 at the arch ribs 110 are used to connect multiple arch ribs 110 into a whole so that they can work together. This can better resist the load. When one arch rib 110 is subjected to a large load, other arch ribs 110 can share part of the load through transverse connection, thereby improving the load-bearing capacity of the entire structure. Similarly, the transverse beams also need to be set between the legs to connect the legs into a whole so that the transverse beams 120 are connected between the first inclined leg 330 and the second inclined leg 340, and the transverse beams 120 are also connected between two adjacent first inclined legs 330.

[0046] In a preferred embodiment of the present invention, the inner and outer ends of the arch seat 320 are both inclined, and the arch foot end of the arch rib 110 is perpendicularly connected to the inner end of the arch seat 320. The bottom ends of the first inclined support leg 330 and the second inclined support leg 340 are perpendicularly connected to the outer end of the arch seat 320.

[0047] It is worth noting that the inner and outer ends of the arch seat 320 are both inclined to match the curvature of the arch foot end of the arch rib 110 and the inclination of the inclined leg, respectively. This ensures that the contact surfaces of the arch foot end of the arch rib 110 and the inner end of the arch seat 320 are perpendicular to each other when connected, allowing the load to be transferred more directly from the arch foot to the arch seat 320. This reduces stress concentration and eccentric force during load transfer, effectively reducing local stress at the arch foot and arch seat 320 and improving the overall load-bearing capacity of the structure. Similarly, the bottom ends of the first inclined leg 330 and the second inclined leg 340 are also perpendicularly connected to the outer end of the arch seat 320 to reduce local stress at the inclined leg and arch seat 320 and improve the load-bearing capacity of the structure.

[0048] In a preferred embodiment of the present invention, the main beam structure 20 includes a standard section 210 and a widened section 220. Both the standard section 210 and the widened section 220 have a bridge deck 230 and multiple beam ribs 240 spaced apart along the transverse direction of the bridge. The beam ribs 240 of the standard section 210 are connected one-to-one to the arch ribs 110. The beam ribs 240 of the widened section 220 are connected to the first inclined leg 330 and the second inclined leg 340. The bridge deck 230 is connected to the top of the beam ribs 240.

[0049] It is worth noting that, considering the need for a gradually widening bridge deck to connect the main span of the arch bridge to the ramp bridge, the main span of the arch bridge is typically a standard section 210, while the side spans are widened sections 220. Although their widths differ, their main structural components are the same. Specifically, both have a bridge deck 230 and multiple beam ribs 240 spaced along the transverse direction. These beam ribs 240 can be UHPC short ribs, which effectively increase the bending and torsional stiffness of the main beam and enhance its lateral stability, thereby improving the load-bearing capacity and overall stability of the main beam. It is also worth mentioning that the width of the standard section 210 matches the width of the arch ring structure 10, meaning that each arch rib 110 is connected to a corresponding standard section 210. The beam rib 240 of the standard section 210 is only connected to the arch crown of the arch rib 110. The overall connection can be improved by setting a structure that connects smoothly with the main beam, such as filling with concrete. The widening section 220 matches the common transverse width of the first inclined leg 330 assembly and the second inclined leg 340 assembly. That is, the widening section 220 can increase the number of beam ribs 240 according to the widening of the bridge deck, so that in addition to the first inclined leg 330, the top of the second inclined leg 340 is also correspondingly provided with beam ribs 240 (widening section 220), thereby improving the overall integrity between the inclined leg and the main beam. The second inclined leg 340 solves the problem that the traditional arch rib 110 cannot be widened and cannot adapt to the widening of the side span connection.

[0050] Furthermore, it also includes a seepage-proof support wall, which is connected between the first inclined leg 330 and the second inclined leg 340, and between two adjacent first inclined legs 330, and the wall surface of the seepage-proof support wall is designed to match the surface of the bank slope 40.

[0051] It should be noted that when the aforementioned seepage-proof support wall is mainly applied to embodiments of rivers with protective slopes, the side span is in direct contact with the bank slope 40. Therefore, it is mainly used to stabilize the bank slope 40 and prevent river seepage. Simultaneously, it can support the main beam between the inclined legs, improving structural reliability. Meanwhile, the first inclined leg 330 and the second inclined leg 340 located in the side span are also in contact with the bank slope 40. During construction, the wall is cast between the first inclined leg 330 and the second inclined leg 340, and between two adjacent first inclined legs 330, to form the... The aforementioned seepage-proof support wall requires pre-excavation of support leg trenches and the required thickness of the seepage-proof support wall in a small area on the soil surface of the bank slope 40, corresponding to the positions of the front and lateral inclined support legs. The height of the seepage-proof support wall is flush with the height of the inclined support legs. After casting, the inclination of the first inclined support leg 330, the second inclined support leg 340, and the seepage-proof support wall are all flush with the bank slope 40, thus fitting snugly against the bank slope 40, achieving a perfect integration of the structure with the bank slope 40 (naturally). The structure has good integration and integrity with the bank slope 40, and requires less maintenance work in the later stages.

[0052] It is worth mentioning that the second inclined leg 340 and the seepage-proof support wall can be adapted to the widened bridge deck by adjusting the angle and width, resulting in a small amount of foundation engineering and good structural stress symmetry. For example, the lateral tilt angle of the second inclined leg 340 can be adjusted. In the embodiment applied to the widened viaduct, the seepage-proof support wall may not be required.

[0053] Furthermore, the end face of the main beam structure 20 is formed with a corbel 250, which is used for connecting the approach bridge behind the platform or the transition pier.

[0054] It should be understood that, in embodiments applied to river channels with protective slopes, the corbel 250 is used for direct connection of the bridge abutment back slab on the bank slope 40. Please refer to the appendix for details. Figure 1 In embodiments applied to variable-width viaducts, the corbel 250 is used for the connection of the approach bridge after the transition pier; please refer to the appendix for details. Figure 2 Therefore, it is understandable that the side spans do not need to be equipped with piers and can be directly connected to the road surface or approach bridge, saving the amount of foundation engineering. Furthermore, the upper end of the inclined support leg is fixed to the end of the main beam without the need for support, and there is no gap between the abutment slab and the main beam (the bridge deck is continuous), resulting in good overall performance.

[0055] Furthermore, the width of each of the arch ribs 110 is consistent.

[0056] It should be noted that the arch structure 10 forms an equal-width arch rib 110, so that the two arch ribs 110 located on the outermost side of the transverse direction can be adjusted to adapt to the bridge widening width (at the junction of the widened section 220 and the standard section 210) by appropriately adjusting the distance between them and the adjacent arch rib 110, which simplifies the construction.

[0057] Furthermore, the pier assembly 310 includes a plurality of piers 311 spaced apart from each other and distributed in a matrix, and the arch seat 320 is connected to the top of the piers 311.

[0058] It should be noted that the number of the piers 311 can be set according to the structural dimensions of the arch seat 320. In a preferred embodiment of this application, the number of the piers 311 is eight, and the eight piers 311 are arranged at intervals and distributed in a matrix.

[0059] Furthermore, the spacing between the plurality of arch ribs 110 is 290mm to 320mm.

[0060] It is understood that the spacing between the arch ribs 110 can be determined according to the width of the bridge. For example, in this application, the spacing between two adjacent arch ribs 110 is 290mm. It is worth noting that, in order to adapt to the change in width, the spacing between the two arch ribs 110 located on the outermost side of the transverse bridge and their adjacent arch ribs 110 (i.e., between the first arch rib 110 and the second arch rib 110 from the outside to the inside along the transverse bridge) is 320mm, in order to adapt to the widening of the bridge. The specific value can be set by those skilled in the art according to the actual situation.

[0061] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A type of upper-bearing variable-width arch bridge, characterized in that, The bridge includes an arch structure, a main beam structure, and two supporting structures, which are arranged opposite each other on both sides of the arch structure along the longitudinal direction of the bridge. Each supporting structure includes a pier assembly, an arch seat, a first inclined leg assembly, and a second inclined leg assembly. The arch seat is connected to the top of the pier assembly. The first inclined leg assembly includes multiple first inclined legs spaced apart along the transverse direction of the bridge. The second inclined leg assembly includes two second inclined legs spaced apart on both sides of the first inclined leg assembly along the transverse direction of the bridge. The two arch feet of the arch structure are respectively connected to the inner ends of the two arch seats. The bottom ends of the first and second inclined legs are both connected to the outer ends of the arch seats, and the top ends of the first and second inclined legs are both connected to the ends of the main beam structure. The first inclined leg and the second inclined leg are each inclined along the longitudinal direction of the bridge towards the end away from the arch structure, from their bottom to their top. The second inclined leg is inclined along the transverse direction of the bridge towards the end away from the first inclined leg, from its bottom to its top.

2. The upper-bearing variable-width arch bridge according to claim 1, characterized in that, The arch structure includes multiple arch ribs spaced apart along the transverse direction of the bridge, with the two arch feet of each arch rib connected to the inner ends of the two arch seats respectively.

3. The upper-bearing variable-width arch bridge according to claim 2, characterized in that, The arch structure also includes multiple transverse beams spaced apart along the transverse direction of the bridge. Each pair of adjacent arch ribs is connected by a transverse beam, and the first and second inclined legs are connected by a transverse beam, as are each pair of adjacent first inclined legs.

4. The upper-bearing variable-width arch bridge according to claim 2, characterized in that, The inner and outer ends of the arch seat are both inclined, and the arch foot end of the arch rib is perpendicularly connected to the inner end of the arch seat. The bottom ends of the first and second inclined legs are perpendicularly connected to the outer end of the arch seat.

5. The upper-bearing variable-width arch bridge according to claim 2, characterized in that, The main beam structure includes a standard section and a widened section. Both the standard section and the widened section have a bridge deck and multiple beam ribs spaced apart along the transverse direction of the bridge. The beam ribs of the standard section are connected one-to-one to the arch ribs. The beam ribs of the widened section are connected to the first and second inclined legs. The bridge deck is connected to the top of the beam ribs.

6. The upper-bearing variable-width arch bridge according to claim 1, characterized in that, It also includes a seepage-proof support wall, which is connected between the first inclined leg and the second inclined leg, and between two adjacent first inclined legs, and the wall surface of the seepage-proof support wall is designed to match the surface of the bank slope.

7. The upper-bearing variable-width arch bridge according to claim 5, characterized in that, The end face of the main beam structure is formed with corbels, which are used for connecting the approach slab or the bridge approach pier after the platform.

8. The upper-bearing variable-width arch bridge according to claim 2, characterized in that, The width of each of the arch ribs is the same.

9. The upper-bearing variable-width arch bridge according to claim 1, characterized in that, The pier assembly includes multiple piers spaced apart from each other and distributed in a matrix, with the arch seat connected to the top of the piers.

10. The upper-bearing variable-width arch bridge according to claim 8, characterized in that, The spacing between the multiple arch ribs is 290mm to 320mm.

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