Steel truss girder cable-stayed bridge girder cable and girder anchoring structure

Abstract

The invention provides a beam cable beam anchoring structure of a steel truss beam cable-stayed bridge. The beam cable beam anchoring structure aims at improving the bearing capacity of the structure, improving stress distribution and simplifying the construction process. The bidirectional curve gradual transition and gradual thickening design is adopted in the connecting area of the overall anchoring plate and the main truss gusset plate, and the root bearing strength is enhanced; a pressure-bearing structure in the steel anchor box is optimized from a # shape to a radiation type layout, and radial stiffening plates are arranged, so that uniform transmission of cable force is realized, and stress concentration is reduced; the joint of the anchor pulling plate and the gusset plate adopts a large-radius convex arc and concave curve combined model, and a smooth force flow channel is provided; a positioning clamping structure is arranged at the bottom end of the anchoring plate and connected with the main truss gusset plate, rapid positioning and suspension are achieved, the installation precision is ensured, a double force transmission mechanism with welding as a main part and clamping as an auxiliary part is formed, and the structural safety and the construction efficiency are improved. The structure has the advantages of being reasonable in stress, convenient to construct, long in service life and the like.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering structure technology, and in particular to a cable-stayed bridge cable-stayed structure with a steel truss girder. Background Technology

[0002] The cable-stayed bridge's cable-stayed girder anchorage structure is a critical component for transmitting cable forces, and its design directly affects the bridge's safety and durability. Current technologies commonly employ cable-stayed girder anchorage methods including single anchor plates, ear plates, and anchor box structures, all of which have certain limitations. Single anchor plate or ear plate type: its structural load-bearing capacity is poor, and the stress concentration phenomenon is significant. In particular, huge local stress is easily generated in the ear plate pin hole area, which leads to material yielding or fatigue damage. At the same time, the cable installation is not very firm, the construction positioning accuracy is difficult to guarantee, and the later inspection and maintenance is not convenient.

[0003] Traditional anchor box structures, such as the grid-shaped steel anchor box proposed in CN101793002B, improve overall integrity by combining the integral anchor plate with the main truss, but the internal force transmission path is still not direct enough, and stress concentration is prone to occur at right-angle welds, affecting the durability of the structure. In addition, its construction process is complicated, the welding process is demanding, the on-site adjustment workload is large, and the economy is not good.

[0004] Therefore, there is an urgent need for a cable-beam anchorage structure that combines high load-bearing capacity, convenient construction, and easy maintenance to solve the problems mentioned above. Summary of the Invention

[0005] This invention provides a cable-stayed bridge anchorage structure for steel truss bridges. By technically modifying existing bridge cable-stayed bridge anchorage structures, it solves the problems of inconvenient construction and insufficient load-bearing capacity of existing anchorage structures.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An anchorage structure for a steel truss cable-stayed bridge cable beam includes two anchor plates, an anchor box, a stiffening plate structure, and a cable guide. The anchor plates are welded and fixedly installed on the main truss node plate. An anchor box is set between the two anchor plates. A cable guide is fixedly installed inside the anchor box. A stiffening plate structure is also set inside the anchor box and fixedly connected to the cable guide. The anchor plate adopts a gradually thickened structure, with the uppermost part of the anchor plate gradually thickening downwards to the connection with the main truss node plate; The bottom end of the anchor plate is provided with a positioning snap-fit ​​structure, and the anchor plate is fixedly connected to the main truss node plate through the positioning snap-fit ​​structure.

[0007] Preferably, the anchor plate includes an outer anchor plate and an inner anchor plate, and the main truss node plate includes a bridge deck and a side longitudinal beam. The lower end of the outer anchor plate is connected to the side longitudinal beam, and the lower end of the inner anchor plate is connected to the bridge deck.

[0008] Preferably, the anchor box is composed of an anchor pad, an anchor bearing plate, and a sealing plate. The anchor pad is located at the bottom of the cable guide tube. Two anchor bearing plates and an anchor tension plate are arranged in a square around the outside of the cable guide tube. A stiffening plate structure is provided between the anchor bearing plate and the outer wall of the cable guide tube. The sealing plate is fixedly closed at the opening above the anchor box.

[0009] Preferably, the stiffening plate structure includes a first stiffening plate and a second stiffening plate. The first stiffening plate is welded and fixed to the outside of the anchor bearing plate, and the bottom of the first stiffening plate is welded and fixed to the anchor pad. The second stiffening plate is welded and fixed between the two anchor bearing plates, and the bottom of the second stiffening plate is welded and fixed to the anchor pad. The first stiffening plate, the second stiffening plate, and the anchor bearing plate together form a grid-shaped reinforcement structure.

[0010] Preferably, the stiffening plate structure further includes a third stiffening plate, which is radially extended from the outer wall of the cable guide towards the anchor bearing plate and welded and fixed.

[0011] Preferably, the outer end of the connection between the anchor plate and the main truss node plate adopts a transition arc combining a large-radius convex arc and an inward concave curve.

[0012] Preferably, the positioning and locking structure includes a high-strength pin shaft, and corresponding cylindrical pin holes are provided at the bottom of the anchor plate and the bottom of the main truss node plate. The high-strength pin shaft is fixedly installed by passing through the cylindrical pin holes.

[0013] Preferably, the positioning and locking structure includes an L-shaped hook key, and a fixing groove is provided on the main truss node plate below the welding and fixing point with the anchor plate, and the L-shaped hook key is engaged with the fixing groove.

[0014] The beneficial effects of this invention are as follows: This invention features two anchor plates that are connected to the bridge deck and the side longitudinal beams respectively, with an anchor box between the anchor plates. Compared to a single anchor plate or ear plate, this design results in less stress, thinner steel plates, easier welding, more direct force transmission, and more convenient maintenance compared to an anchor box.

[0015] The anchor plate in this application improves the root bearing capacity and stress distribution uniformity through a bidirectional curved gradual transition and gradual thickening design.

[0016] This application incorporates a stiffening plate structure for reinforcement, mimicking the spoke principle of a wheel, which can transmit cable force more directly and evenly to the surrounding boundary supports. The radial bearing structure optimizes the force transmission path and avoids stress concentration at right-angle welds.

[0017] The connection between the anchor plate and the gusset plate in this application employs a design combining a large-radius convex arc and an inward concave curve. The arc shape provides a smooth and fluid force flow channel. Force can be smoothly guided from one component (gusset plate) to another component (anchor plate), avoiding sudden stress increases, greatly improving the stress state of the structure, and extending the structural life.

[0018] This application's anchor plate also features a positioning snap-fit ​​structure, enabling preliminary positioning and fixation before welding the anchor plate to the main truss node plate. This makes the construction process more stable and safe, particularly suitable for areas subjected to enormous horizontal shear forces. The positioning structure ensures absolutely precise angle and planar position, while welding primarily serves the force transmission function. This dual fixing method significantly increases the installation's robustness and strengthens the cable beam's load-bearing capacity. The snap-fit ​​achieves "foolproof" rapid positioning, reducing on-site adjustment and measurement time (rapid positioning meets angle requirements), lowering reliance on highly skilled welders, and effectively shortening the construction period. Structural safety is significantly enhanced: providing a dual force transmission mechanism of "welding as the primary method and snap-fit ​​as a secondary method," even if fatigue cracks appear in the weld under extreme loads, the mechanical snap-fit ​​can act as a second line of defense, continuing to transmit part of the load and preventing catastrophic damage, which aligns with the "fail-safe" principle in bridge engineering. Quality control is more reliable: the snap-fit's fitting precision can be strictly controlled in the factory, reducing uncertainties during on-site construction. Overall, the economic benefits throughout the entire life cycle are superior. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the invention installed on the main truss node plate; Figure 3 This is a schematic diagram of the internal stiffening plate structure of the anchor box of the present invention; Figure 4 This is a schematic diagram of the side structure of the present invention; Figure 5 This is a schematic diagram of the positioning and snap-fit ​​structure of Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of embodiment 2 of the positioning and snap-fit ​​structure of the present invention; Reference numerals: 1. Anchor plate; 11. Outer anchor plate; 12. Inner anchor plate; 2. Anchor box; 21. Anchor pad; 22. Anchor bearing plate; 23. Sealing plate; 3. Stiffening plate structure; 31. First stiffening plate; 32. Second stiffening plate; 33. Third stiffening plate; 4. Cable guide; 5. Positioning and snap-fit ​​structure; 51. High-strength pin; 52. L-shaped hook key; 6. Main truss node plate; 61. Fixing slot; 7. Transition arc. Detailed Implementation

[0020] The specific content of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0021] Please see Figure 1-6 As shown, the present invention provides a cable-stayed bridge cable-stayed structure, including two anchor plates 1, an anchor box 2, a stiffening plate structure 3 and a cable guide 4. The anchor plates are welded and fixedly installed on the main truss node plate 6. An anchor box 2 is provided between the two anchor plates. The cable guide 4 is fixedly installed in the anchor box 2. The stiffening plate structure 3 is also provided in the anchor box 2 and fixedly connected to the cable guide 4. The anchor plate 1 adopts a gradually thickened structure, with the uppermost part of the anchor plate 1 gradually thickening downwards to the connection point with the main truss node plate 6; The bottom end of the anchor plate 1 is provided with a positioning and snapping structure 5, and the anchor plate is fixedly connected to the main truss node plate 6 through the positioning and snapping structure 5.

[0022] This application changes the original straight-line extension transition to a two-way curved gradual transition. Specifically, at the root of the integral anchor plate 1 extending upward from the node plate, the extension transition area between the integral anchor plate 1 and the main truss node plate 6 can adopt a gradual thickening. That is, the thickness of the anchor plate 1 is greatest near the root of the main truss node, and then the thickness gradually decreases upward along the height direction until it returns to the original design thickness, thereby increasing the load-bearing strength.

[0023] Furthermore, the anchor plate 1 includes an outer anchor plate 11 and an inner anchor plate 12. The main truss node plate 6 includes a bridge deck and side longitudinal beams. The lower end of the outer anchor plate 11 is connected to the side longitudinal beams, and the lower end of the inner anchor plate 12 is connected to the bridge deck. Using two anchor plates to fix the anchor box 2 structure results in less stress compared to a single anchor plate or ear plate, thinner steel plates, easier welding, more direct force transmission, and more convenient maintenance compared to the anchor box 2.

[0024] Furthermore, in order to fix the anchor box 2, the anchor box 2 is composed of an anchor pad 21, an anchor bearing plate 22, and a sealing plate 23. The anchor pad 21 is located at the bottom of the cable guide 4. The two anchor bearing plates 22 and the anchor tie plate are arranged in a square surrounding the outside of the cable guide 4. A stiffening plate structure 3 is provided between the anchor bearing plate 22 and the outer wall of the cable guide 4. The sealing plate 23 is fixedly closed at the opening above the anchor box 2.

[0025] Furthermore, the stiffening plate structure 3 includes a first stiffening plate 31 and a second stiffening plate 32. The first stiffening plate 31 is welded and fixed to the outside of the anchor bearing plate 22, and the bottom of the first stiffening plate 31 is welded and fixed to the anchor pad plate 21. The second stiffening plate 32 is welded and fixed between the two anchor bearing plates 22, and the bottom of the second stiffening plate 32 is welded and fixed to the anchor pad plate 21. The first stiffening plate 31, the second stiffening plate 32 and the anchor bearing plate 22 together form a grid-shaped reinforcement structure.

[0026] Furthermore, the stiffening plate structure 3 also includes a third stiffening plate 33, which is radially extended from the outer wall of the cable guide 4 toward the anchor bearing plate 22 and welded and fixed. This structure mimics the spoke principle of a wheel, enabling the cable force to be transmitted more directly and evenly to the surrounding boundary supports, avoiding stress concentration at right-angle welds.

[0027] Furthermore, the outer end of the connection between the anchor plate 1 and the main truss node plate 6 adopts a transition arc 7 that combines a large-radius convex arc with an inward concave curve. The arc-shaped transition arc 7 provides a smooth and fluid force flow channel. Force can be smoothly guided from one component (node ​​plate) to another component (anchor plate), avoiding sudden stress increases and greatly improving the stress state of the structure.

[0028] Furthermore, in a specific embodiment 1, the positioning and snapping structure 5 includes a high-strength pin shaft 51, and the bottom of the anchor plate 1 and the bottom of the main truss node plate 6 are provided with corresponding cylindrical pin holes, and the high-strength pin shaft 51 is fixedly installed by passing through the cylindrical pin holes.

[0029] Furthermore, in another specific embodiment 2, the positioning and locking structure 5 includes an L-shaped hook key 52. ​​A fixing groove 61 is provided on the main truss node plate 6 below the welding and fixing point with the anchor plate. The L-shaped hook key 52 is engaged with the fixing groove 61. The L-shaped hook key 52 is first fixed to the fixing groove 61 for initial positioning and fixing.

[0030] This application features a positioning snap-fit ​​structure 5 on the anchor plate 1, which allows for preliminary positioning and fixing before welding the anchor plate 1 to the main truss node plate 6. This makes the construction process more stable and safe, particularly suitable for parts subjected to enormous horizontal shear forces. The positioning structure ensures absolutely precise angle and planar position, while welding primarily serves as the force transmission mechanism. This dual fixing method significantly increases the installation's robustness and strengthens the cable beam's load-bearing capacity. The snap-fit ​​enables "foolproof" rapid positioning, reducing on-site adjustment and measurement time (rapid positioning meets angle requirements), lowering reliance on highly skilled welders, and effectively shortening the construction period. Structural safety is significantly enhanced: it provides a dual force transmission mechanism of "welding as the primary method and snap-fit ​​as the secondary method." Even if fatigue cracks appear in the weld under extreme loads, the mechanical snap-fit ​​acts as a second line of defense, continuing to transmit part of the load and preventing catastrophic damage, which aligns with the "fail-safe" principle in bridge engineering. Quality control is more reliable: the snap-fit's fitting precision can be strictly controlled in the factory, reducing uncertainties during on-site construction. Overall, it offers superior economic efficiency throughout its lifecycle.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0032] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A cable-stayed bridge anchorage structure for a steel truss girder, characterized in that, It includes two anchor plates, an anchor box, a stiffening plate structure, and a cable guide. The anchor plates are welded and fixedly installed on the main truss node plate. An anchor box is set between the two anchor plates, and a cable guide is fixedly installed inside the anchor box. A stiffening plate structure is also set inside the anchor box and fixedly connected to the cable guide. The anchor plates adopt a gradually thickened structure, which gradually thickens from the top of the anchor plate downwards to the connection with the main truss node plate. A positioning snap-fit ​​structure is set at the bottom of the anchor plate, and the anchor plate is fixedly connected to the main truss node plate through the positioning snap-fit ​​structure.

2. The cable-stayed bridge anchorage structure for a steel truss girder according to claim 1, characterized in that, The anchor plate includes an outer anchor plate and an inner anchor plate. The main truss node plate includes a bridge deck and a side longitudinal beam. The lower end of the outer anchor plate is connected to the side longitudinal beam, and the lower end of the inner anchor plate is connected to the bridge deck.

3. The cable-stayed bridge anchorage structure for a steel truss girder according to claim 1, characterized in that, The anchor box consists of an anchor pad, an anchor bearing plate, and a sealing plate. The anchor pad is located at the bottom of the cable guide tube. Two anchor bearing plates and an anchor tension plate are arranged in a square around the outside of the cable guide tube. A stiffening plate structure is provided between the anchor bearing plate and the outer wall of the cable guide tube. The sealing plate is fixed and closed at the opening at the top of the anchor box.

4. The cable-stayed bridge anchorage structure for a steel truss girder according to claim 1, characterized in that, The stiffening plate structure includes a first stiffening plate and a second stiffening plate. The first stiffening plate is welded and fixed to the outside of the anchor bearing plate, and the bottom of the first stiffening plate is welded and fixed to the anchor pad. The second stiffening plate is welded and fixed between the two anchor bearing plates, and the bottom of the second stiffening plate is welded and fixed to the anchor pad. The first stiffening plate, the second stiffening plate and the anchor bearing plate together form a grid-shaped reinforcement structure.

5. The cable-stayed bridge anchorage structure for a steel truss girder according to claim 4, characterized in that, The stiffening plate structure also includes a third stiffening plate, which is radially extended from the outer wall of the cable guide towards the anchor bearing plate and welded and fixed.

6. The cable-stayed bridge anchorage structure for a steel truss girder according to claim 1, characterized in that, The outer end of the connection between the anchor plate and the main truss node plate adopts a transition arc combining a large-radius convex arc and an inward concave curve.

7. The cable-stayed bridge anchorage structure for a steel truss girder according to claim 1, characterized in that, The positioning and snapping structure includes a high-strength pin shaft, and corresponding cylindrical pin holes are provided at the bottom of the anchor plate and the bottom of the main truss node plate. The high-strength pin shaft is fixedly installed by passing through the cylindrical pin holes.

8. The cable-stayed bridge anchorage structure for a steel truss girder according to claim 1, characterized in that, The positioning and locking structure includes an L-shaped hook key. A fixing groove is provided on the main truss node plate below the welding and fixing point with the anchor plate. The L-shaped hook key is engaged with the fixing groove.

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