A through plane bending steel arch bridge structure

Abstract

The utility model discloses a lower bearing type plane bending steel arch bridge beam structure, including steel roof, the top surface fixed mounting of steel roof has arch rib, the surface fixed mounting of arch rib has the reinforcing bar, the bottom surface fixed mounting of steel roof has the support beam, the surface of support beam has seted up the sliding slot, the surface fixed mounting of support beam has the fixed block, the inside plug -in of fixed block has the lead screw, the top fixed mounting of lead screw has the support block, the inside sliding connection of fixed block has the moving block, the side surface swing joint of moving block has the support rod, the bottom fixed mounting of support rod has the sliding block, through adjustable bottom support structure to strengthen the stability and adaptability of bridge, and the sliding slot of support beam bottom surface sets up and cooperates with the sliding block, and the support rod is allowed to move flexibly according to the stress condition to distribute load, and the height of support block can be adjusted to the lead screw and moving block, so that its top end is always in close contact with steel roof bottom surface, provides the continuous stable vertical support.

Description

Technical Field

[0001] This utility model relates to the field of arch bridge structure technology, specifically to a planar curved steel arch bridge structure with a lower deck. Background Technology

[0002] A planar curved arch bridge is a beautiful bridge structure. The curved shape of the arch on the facade and plane gives the structure a strong visual impact.

[0003] Chinese Patent Publication No. CN117431825A discloses a planar curved steel arch bridge structure. This planar curved steel arch bridge is a steel arch bridge whose plane is located on a curved section of a road. Its features include: the bridge is composed of arch ribs, cross braces, and arch foot areas; the arch ribs are steel tubes with a flattened or circular cross-section, and the arch axis is curved in both the plane and elevation; there are two arch ribs in the transverse direction, arranged parallel or inwardly along the longitudinal direction of the bridge; the cross braces are steel tubes with a circular cross-section; the cross braces are arranged in a mesh-like form on the horizontal projection plane, forming a truss structure with the two arch ribs, with the arch ribs serving as the upper and lower chords of the truss structure, and the mesh-like cross braces serving as the web members of the truss structure; the arch foot areas are located between the ends of the arch ribs and the first cross brace, with a total of four arch foot areas; each arch foot area consists of a box-shaped closed structure composed of two side arch foot area web plates, an end arch foot area end plate, and an internal stiffening plate, connecting the arch ribs and steel beams into a whole. The preferred cross bracing is a circular cross-section steel pipe structure, with a spatial mesh-like shape. The intersection of the cross bracing and the arch rib serves as the anchoring point on the cable-stayed arch. The horizontal projection angle (a) of the cross bracing is 30°–60°. Multiple sets of cables are used, with the upper end fixed to the arch rib and the lower end fixed to the steel beam. The distance (L1) between the upper end of the arch foot area and the connection point of the first cross bracing along the axial direction of the arch rib is 1–2 times the width (b) of the arch rib cross section. The box-shaped enclosed structure also includes internal stiffening plates arranged horizontally and longitudinally in a crisscross pattern. The upper end of the web of the arch foot section is welded to the arch rib, and the lower end is welded to the steel beam. A rounded chamfer is provided at the end of the arch foot section and welded to the end plate of the arch foot section. The end plate of the arch foot section is welded to the arch rib and the steel beam. Internal stiffening plates arranged longitudinally in the arch foot section are welded to the web, arch rib, and steel beam of the arch foot section. Internal stiffening plates arranged transversely in the arch foot section are welded to the web, arch rib, and end plate of the arch foot section. In this prior art, the two transverse arch ribs and the mesh-like cross braces form a truss structure on the horizontal projection, jointly bearing the out-of-plane bending of the arch and converting the transverse bending moment of the arch into the axial force of the arch ribs and cross braces. The arch foot section uses a large arch foot section, connecting the arch ribs and steel beams into a whole, extending the support length of the arch ribs, and reducing the transverse bending moment of the arch foot. This invention can effectively solve the transverse bending problem of under-bearing planar curved arch bridges, with a lightweight and aesthetically pleasing structure, enriching the structural forms of curved arch bridges.

[0004] Although the above-mentioned applications meet the user's needs to a certain extent, there are still some defects in the use process. The specific problems are as follows: although the support length of the arch foot area can be extended through large-scale design, its position and size are fixed and cannot be dynamically adjusted according to the actual load changes. When the bridge is located on a complex curve section or bears asymmetrical live load, the concentrated stress borne by the fixed arch foot area may be too large, resulting in local fatigue damage. Based on this, this utility model designs a lower-bearing planar bending steel arch bridge structure to solve the above problems. Utility Model Content

[0005] This utility model provides a planar curved steel arch bridge structure with a lower deck, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a bottom-bearing planar curved steel arch bridge structure, comprising a steel beam, an arch rib fixedly installed on the top surface of the steel beam, reinforcing ribs fixedly installed on the surface of the arch rib, a support beam fixedly installed on the bottom surface of the steel beam, a sliding groove formed on the surface of the support beam, a fixing block fixedly installed on the surface of the support beam, a lead screw inserted inside the fixing block, a support block fixedly installed at the top end of the lead screw, a movable block slidably connected inside the fixing block, a support rod rotatably connected to the side of the movable block, and a slider fixedly installed at the bottom end of the support rod.

[0007] There are two sets of arch ribs, and the two sets of arch ribs are symmetrically installed on the surface of the steel beam.

[0008] The number of reinforcing ribs is in several groups, and the several groups of reinforcing ribs are distributed at equal intervals on the surface of the arch rib.

[0009] The support beam is arc-shaped, and the slide groove is arc-shaped.

[0010] The top of the support block abuts against the bottom surface of the steel beam.

[0011] The bottom end of the lead screw is rotatably connected to the inside of the fixed block.

[0012] The lead screw passes through the interior of the moving block.

[0013] The movable block has internal threads, and the threads mesh with the lead screw.

[0014] The slider is slidably connected to the inside of the groove.

[0015] Several sets of support ribs are fixedly installed on the surface of the support beam, and the several sets of support ribs are distributed at equal intervals on the surface of the support beam.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model enhances the stability and adaptability of the bridge through an adjustable bottom support structure. The sliding groove and slider set on the bottom surface of the support beam allow the support rod to move flexibly according to the stress condition, thereby distributing the load. The threaded engagement mechanism between the screw and the moving block allows the height of the support block to be adjusted, ensuring that its top is always in close contact with the bottom surface of the steel beam, providing continuous and stable vertical support, offsetting the lateral bending moment and torsion generated when the planar curved arch bridge is subjected to asymmetrical loads, and improving the overall stiffness and deformation resistance of the structure. The equally spaced reinforcing ribs on the surface of the arch rib further enhance the local stability of the arch rib and prevent buckling. The additional supporting ribs on the surface of the support beam improve the bending resistance of the support beam itself, enabling it to better transfer and disperse stress. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] In the attached diagram:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a top view of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the support beam of this utility model;

[0022] Figure 4 This is a partial sectional view of the support beam of this utility model;

[0023] The following are the labels in the diagram: 1. Steel beam; 2. Arch rib; 3. Reinforcing rib; 4. Support beam; 5. Slide groove; 6. Fixed block; 7. Screw rod; 8. Support block; 9. Moving block; 10. Support rod; 11. Sliding block; 12. Support rib. Detailed Implementation

[0024] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0025] Example: Figure 1-4As shown, this utility model provides a technical solution for a bottom-bearing planar curved steel arch bridge structure, including a steel beam 1, an arch rib 2 fixedly installed on the top surface of the steel beam 1, a reinforcing rib 3 fixedly installed on the surface of the arch rib 2, a support beam 4 fixedly installed on the bottom surface of the steel beam 1, a sliding groove 5 opened on the surface of the support beam 4, a fixing block 6 fixedly installed on the surface of the support beam 4, a screw rod 7 inserted inside the fixing block 6, a support block 8 fixedly installed at the top of the screw rod 7, a movable block 9 slidably connected inside the fixing block 6, a support rod 10 rotatably connected to the side of the movable block 9, and a slider 11 fixedly installed at the bottom end of the support rod 10. Through the coordination of the steel beam 1 and the arch rib 2... The same work significantly improves the overall rigidity and bending resistance of the bridge, making it suitable for long-span curved bridges. It has good structural stability and load transfer efficiency. There are two sets of arch ribs 2, which are symmetrically installed on the surface of the steel beam 1. The symmetrical arrangement of the arch ribs 2 can evenly distribute the bridge deck load, enhance the balance and torsional resistance of the structure, and effectively prevent deformation or damage caused by eccentric loading. There are several sets of reinforcing ribs 3, which are evenly distributed on the surface of the arch ribs 2. The evenly distributed reinforcing ribs 3 greatly improve the local stability and buckling resistance of the arch ribs 2, while also helping to disperse stress concentration and extend the service life of the structure.

[0026] The support beam 4 and the slide 5 are both arc-shaped. The arc-shaped support beam 4 and slide 5 are designed to better adapt to the planar curvature of the bridge, improve the consistency and mechanical rationality of the overall structure, and provide a smooth displacement path for the support system. The top of the support block 8 abuts against the bottom surface of the steel beam 1, and the support block 8 directly presses against the steel beam 1, which can effectively transmit vertical support force and enhance the rigidity and anti-settlement capacity of the bridge span structure. The bottom end of the screw rod 7 is rotatably connected to the inside of the fixed block 6, which can limit the screw rod 7 and prevent it from moving. The screw rod 7 passes through the inside of the moving block 9, and the inside of the moving block 9 is threaded, and the thread and the screw rod 7 are engaged. The thread engagement design allows the moving block 9 to move up and down along the screw rod 7, realizing stepless adjustment of the support height, which is simple to operate and highly reliable.

[0027] The slider 11 is slidably connected to the inside of the groove 5. The slider 11 cooperates with the arc-shaped groove 5 and can slide along a predetermined path when subjected to force, releasing the deformation stress caused by temperature changes and loads, and avoiding the generation of additional internal forces in the structure. Several sets of support ribs 12 are fixedly installed on the surface of the support beam 4. The several sets of support ribs 12 are evenly distributed on the surface of the support beam 4. The evenly distributed support ribs 12 significantly enhance the bending and shear resistance of the support beam 4, improve its overall stiffness and stability, and further improve the load distribution effect.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A planar curved steel arch bridge structure with under-deck construction, comprising steel beams (1), characterized in that: An arch rib (2) is fixedly installed on the top surface of the steel beam (1), and a reinforcing rib (3) is fixedly installed on the surface of the arch rib (2). A support beam (4) is fixedly installed on the bottom surface of the steel beam (1). A sliding groove (5) is opened on the surface of the support beam (4). A fixing block (6) is fixedly installed on the surface of the support beam (4). A screw rod (7) is inserted inside the fixing block (6). A support block (8) is fixedly installed at the top of the screw rod (7). A moving block (9) is slidably connected inside the fixing block (6). A support rod (10) is rotatably connected to the side of the moving block (9). A slider (11) is fixedly installed at the bottom end of the support rod (10).

2. The under-deck planar curved steel arch bridge structure according to claim 1, characterized in that, There are two sets of arch ribs (2), and the two sets of arch ribs (2) are symmetrically installed on the surface of the steel beam (1).

3. The under-deck planar curved steel arch bridge structure according to claim 2, characterized in that, The number of reinforcing ribs (3) is several groups, and the several groups of reinforcing ribs (3) are distributed at equal intervals on the surface of the arch rib (2).

4. The under-deck planar curved steel arch bridge structure according to claim 3, characterized in that, The support beam (4) is arc-shaped, and the groove (5) is arc-shaped.

5. A planar curved steel arch bridge structure according to claim 4, characterized in that, The top of the support block (8) abuts against the bottom of the steel beam (1).

6. The under-deck planar curved steel arch bridge structure according to claim 5, characterized in that, The bottom end of the lead screw (7) is rotatably connected to the inside of the fixed block (6).

7. A planar curved steel arch bridge structure according to claim 6, characterized in that, The lead screw (7) passes through the interior of the moving block (9).

8. A planar curved steel arch bridge structure according to claim 7, characterized in that, The moving block (9) has a thread inside, and the thread meshes with the lead screw (7).

9. A planar curved steel arch bridge structure according to claim 8, characterized in that, The slider (11) is slidably connected to the inside of the groove (5).

10. A planar curved steel arch bridge structure according to claim 9, characterized in that, Several sets of support ribs (12) are fixedly installed on the surface of the support beam (4), and the several sets of support ribs (12) are distributed at equal intervals on the surface of the support beam (4).

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