Improved anchoring device for cable-stayed-cable suspension cooperative bridge end cable stress and manufacturing method

Abstract

This invention discloses an anchoring device and manufacturing method for improving the stress on the end cables of a cable-stayed-suspension bridge. The device includes a pressure plate located at the bottom of the top plate of a stiffening girder. A suspender cable is threaded through the top plate of the stiffening girder. An elastic pad is located at the bottom of the pressure plate to adjust the length and stress state of the suspender cable between the main cable and the pressure plate, thereby reducing the live load stress amplitude of the end cable. An anchoring seat is located at the bottom of the elastic pad, and an anchor plate is located at the bottom of the anchoring seat. An anchor is located at the bottom of the anchor plate for anchoring the suspender cable. One side of the pressure plate is fixedly connected to the cross diaphragm of the stiffening girder, and limit plates are fixedly installed on three sides to restrict the horizontal movement of the elastic pad. This anchoring device for end cable stress can generate corresponding elastic deformation according to the magnitude of the cable force, reducing the anchoring stiffness of the suspender cable on the main girder, adjusting the stress distribution of the suspender cable in local areas, and avoiding fatigue failure of the suspender cable due to excessive stress caused by traditional rigid anchoring.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, and more specifically, relates to an anchoring device and manufacturing method for improving the stress on the end cables of a cable-stayed-suspension bridge. Background Technology

[0002] Cable-stayed-suspension bridges, due to their larger spans and higher stiffness compared to cable-stayed bridges, combining the advantages of both, are increasingly being used in ultra-long-span bridges. In recent years, my country has constructed several large-span cable-stayed-suspension bridges using this system, including the Xihoumen Railway-Highway Bridge, the G3 Tongling Yangtze River Railway-Highway Bridge, and the Jingzhou Libu Yangtze River Railway-Highway Bridge. This collaborative system optimizes the overall structural stress performance through the combined force distribution of the cable-stayed and suspension systems. However, in practical engineering applications, a prominent technical challenge of cable-stayed-suspension bridges is that at the connection between the cable-stayed and suspension sections, the stress amplitude of the suspension end cable (the first cable adjacent to the cable-stayed cable) under live load is much greater than that of other cables, making it prone to fatigue failure.

[0003] The reason why the stress amplitude of the end cable is significantly greater than that of the other cables is mainly because when a vehicle or other live load acts on the cable-stayed section near the suspension section, the load is transferred to the suspension section through the main beam, first to the end cable (the first cable of the suspension section). Due to the small elongation of the end cable, the first cable bears most of the load. The excessive axial stiffness of the end cable prevents the other cables from fully utilizing their function. If the axial stiffness of the first cable can be reduced, the load borne by the first cable will decrease, and its stress amplitude will also decrease.

[0004] Currently, common technical methods used in engineering to mitigate excessive stress amplitude in end-stayed cables include: ① Establishing a transition zone between the cable-stayed and suspended sections, where both cable-stayed and suspended cables are installed, typically with 6-9 pairs of cross cables; ② Using larger stiffening girder sections to increase stiffness; ③ Increasing the cross-sectional area of ​​the end-stayed cables to reduce their live load stress amplitude; ④ Installing auxiliary piers on the side spans to increase overall structural stiffness. These methods are often used in combination. Several existing or under-construction cable-stayed-suspension systems have established transition zones between cable-stayed and suspended cables. However, these methods for reducing end-stayed cable stress amplitude have drawbacks, such as increasing the number of components and material usage, thus reducing the structure's economic performance. In particular, establishing a transition zone between the cable-stayed and suspended sections often requires multiple pairs of cross cables to effectively reduce the end-stayed cable stress amplitude. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides an anchoring device and manufacturing method for improving the stress on end cables of a cable-stayed-suspension bridge. By adding an elastic pad between the bearing plate and the anchorage, the elastic pad is composed of N layers of stiffening steel plates and N+1 layers of rubber spaced apart. The elastic pad can generate corresponding elastic deformation according to the magnitude of the cable force. When the cable force increases, the elastic pad is compressed, which is equivalent to increasing the cable length between the main cable and the bearing plate, reducing the cable stress, lowering the anchorage stiffness of the cable on the main beam, adjusting the local stress distribution of the cable, and avoiding fatigue failure of the cable caused by excessive end cable stress due to traditional rigid anchoring. Anchoring devices are installed at the anchorages of the stiffening girder and the two to three pairs of suspension cables outside the suspension zone of the collaborative system bridge. By utilizing the difference in anchorage stiffness of the suspension cables, the load is evenly distributed to the local suspension cable area, automatically adjusting the stress state of the suspension cables to keep them in the optimal working state. This significantly alleviates the problem of stress concentration in the suspension cables and improves the safety and durability of the bridge structure. Compared with technical means such as increasing the number of cross cables, increasing the stiffness of the main girder, and setting auxiliary piers in the side spans, only local modification of the anchorage points is required, which greatly reduces the need for additional materials, thereby effectively controlling the project cost, improving the economic performance of the project, and does not lead to a significant increase in the self-weight of the bridge structure. This method is suitable for the application of long-span bridge structures.

[0006] To achieve the above objectives, according to one aspect of the present invention, an anchoring device for improving the stress on the end cables of a cable-stayed-suspension bridge is provided, comprising a pressure plate disposed at the bottom of a stiffening girder top plate, wherein a cable is disposed through the top plate of the stiffening girder, and an elastic pad is provided at the bottom of the pressure plate for adjusting the length and stress state of the cable between the main cable and the pressure plate, thereby reducing the live load stress amplitude of the end cable, adjusting the stress distribution of the cable in a local area, and avoiding excessive stress on the end cable leading to fatigue failure of the cable;

[0007] The elastic pad is provided with an anchor seat at the bottom, and an anchor plate is provided at the bottom of the anchor seat. An anchor for anchoring the sling is provided at the bottom of the anchor plate. One side of the pressure plate is fixedly connected to the stiffening beam diaphragm, and limit plates are fixedly installed on its three sides to restrict the horizontal movement of the elastic pad so that it only undergoes axial deformation.

[0008] Furthermore, the elastic pad is disposed between the pressure plate and the anchor seat, and includes N layers of stiffening steel plates and N+1 layers of rubber, with the stiffening steel plates and rubber layers spaced apart and a through hole provided in the middle so that the sling can pass through it.

[0009] Furthermore, anchoring devices with different stiffnesses can be achieved by adjusting the number, material, thickness, or shape of the stiffening steel plates and rubber layers that make up the elastic pad, in order to adapt to the stress requirements of different slings.

[0010] Furthermore, the elastic pad can undergo corresponding elastic deformation according to the magnitude of the cable force. When the cable force increases, the elastic pad is compressed, which is equivalent to increasing the length of the cable between the main cable and the pressure plate, and reducing the stress on the cable.

[0011] Furthermore, the top of the limiting plate is fixedly connected to the bottom of the stiffening beam top plate, and the side is fixedly connected to the stiffening beam diaphragm.

[0012] Furthermore, the vertical length of the limiting plate is greater than the distance from the top plate of the stiffening beam to the anchorage when the elastic pad is not under force.

[0013] Furthermore, the pressure plate has a circular hole in the middle through which the lifting cable can pass.

[0014] Furthermore, the anchor seat has an installation hole in the middle for the sling to pass through, and stiffening ribs to increase rigidity are fixedly installed at the diagonal, the stiffening ribs having a right trapezoidal profile.

[0015] Furthermore, the anchoring device is set at the anchorage of 2 to 3 pairs of suspenders and stiffening beams on the outside of the suspension zone of the cable-stayed-suspension bridge.

[0016] According to a second aspect of the present invention, a method for manufacturing an anchoring device to improve the stress on the end cables of a cable-stayed-suspension bridge is provided, comprising the following steps:

[0017] S100: Based on the bridge design parameters, a full-bridge finite element model is established using finite element analysis software to simulate the stress state of the bridge under different load conditions. Spring elements are used to simulate the anchorage positions of the suspenders and main beams at the bridge ends, and the spring elements simulate the anchorage devices.

[0018] S200: Apply an initial stiffness k to the spring and calculate the stress amplitude of the end cable and adjacent cables under the load of a car or train. Assume that the calculated stress amplitude of the end cable is σ1 and the stress amplitude of the second cable is σ2.

[0019] S300: Compare the magnitudes of σ1 and σ2. If σ1 is greater than σ2, it indicates that the force borne by the suspension cable at the bridge end is too large. The spring stiffness k value should be reduced and the calculation should be recalculated. Conversely, the spring stiffness k value should be increased until σ1 and σ2 are close.

[0020] S400: Based on the calculated k value, design the material, thickness, shape, and size of the stiffening steel plate and rubber layer in the elastic pad to make the stiffness of the elastic pad equal to the calculated spring stiffness.

[0021] S500: The remaining structure of the anchoring device is made according to the size of the elastic pad, including slings, anchors, anchor plates, anchor seats, elastic pads, pressure plates and limiting plates;

[0022] S600: Install the anchoring device on the bridge according to the design drawings and construction plan, and conduct long-term health monitoring of the bridge after installation to ensure the effectiveness of the anchoring device and the overall safety of the bridge.

[0023] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0024] 1. The anchoring device for end sling tension of the present invention adds an elastic pad between the bearing plate and the anchoring seat. The elastic pad is composed of N layers of stiffening steel plates and N+1 layers of rubber arranged at intervals. The elastic pad can generate corresponding elastic deformation according to the magnitude of the sling tension. When the sling tension increases, the elastic pad is compressed, which is equivalent to increasing the sling length between the main cable and the bearing plate, reducing the sling tension, reducing the anchoring stiffness of the sling on the main beam, adjusting the local area of ​​sling tension distribution, and avoiding fatigue failure of the sling caused by excessive end sling tension due to traditional rigid anchoring.

[0025] 2. Compared with technical means such as increasing the number of cross cables, increasing the stiffness of the main beam, and setting auxiliary piers in the side spans, the anchorage device of the present invention only requires local modification of the anchorage point, which greatly reduces the demand for additional materials, thereby effectively controlling the project cost, improving the economic performance of the project, and does not lead to a significant increase in the self-weight of the bridge structure, making it suitable for the application of long-span bridge structures.

[0026] 3. The anchoring device for end-suspension cable load of the present invention sets anchoring devices at the anchoring points of 2 to 3 pairs of suspension cables and stiffening beams outside the suspension zone of the cooperative system bridge. By utilizing the difference in anchoring stiffness of the suspension cables, the load is evenly distributed to the local suspension cable area, automatically adjusting the stress state of the suspension cables so that they are always in the optimal working state, significantly alleviating the problem of stress concentration in the suspension cables, and improving the safety and durability of the bridge structure.

[0027] 4. The end-sling anchoring device of the present invention, through its modular design, exhibits significant advantages in installation and replacement. Compared with other improvement technologies, it also effectively controls later maintenance costs and improves overall operational efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an anchoring device for improving the stress on the end cables of a cable-stayed-suspension bridge according to an embodiment of the present invention;

[0029] Figure 2 This is a top view of an anchorage seat for an anchorage device that improves the stress on the end cables of a cable-stayed-suspension bridge according to an embodiment of the present invention.

[0030] Figure 3 This is an elevation view of an anchorage seat of an anchorage device for improving the stress on the end cables of a cable-stayed-suspension bridge according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of an elastic pad structure for an anchoring device that improves the stress on the end cables of a cable-stayed-suspension bridge according to an embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram illustrating the installation location of an anchoring device for improving the stress on the end cables of a cable-stayed-suspension bridge according to an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram illustrating the manufacturing process of an anchoring device for improving the stress on the end cables of a cable-stayed-suspension bridge, according to an embodiment of the present invention.

[0034] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-stiffening beam top plate, 2-lifting cable, 3-anchor, 4-anchor plate, 5-anchor seat, 51-mounting hole, 52-stiffening rib, 6-elastic pad, 61-rubber layer, 62-stiffening steel plate, 7-pressure plate, 8-limiting plate. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0036] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are 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 with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] In this patent, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0039] Example 1

[0040] like Figure 1-5As shown, this embodiment of the invention provides an anchoring device for improving the stress on the end cables of a cable-stayed-suspension bridge. The device includes a pressure plate 7, which is located at the bottom of a stiffening girder top plate 1. A cable 2 is threaded through the top plate 1. An elastic pad 6 is provided at the bottom of the pressure plate 7 to adjust the length and stress state of the cable 2 between the main cable and the pressure plate 7, thereby reducing the live load stress amplitude of the end cable. An anchoring seat 5 is provided at the bottom of the elastic pad 6, and an anchor plate 4 is provided at the bottom of the anchoring seat 5. An anchor 3 for anchoring the cable 2 is provided at the bottom of the anchor plate 4. One side of the pressure plate 7 is connected to the cross diaphragm of the stiffening girder. The anchoring device is fixedly connected, with limit plates 8 fixedly installed on three sides to restrict the horizontal movement of the elastic pads 6. The top of the limit plates 8 is fixedly connected to the bottom of the stiffening beam top plate 1. The bearing plate 7 is located at the bottom of the stiffening beam top plate 1, serving to support and transmit force. Through its fixed connection with the stiffening beam diaphragm, it enhances the stability of the entire anchoring device. The sling 2 passes through the interior of the stiffening beam top plate, serving to connect and support. The load on the stiffening beam is transferred to the anchoring device, which further transfers the load to the main cable through the sling 2. The elastic pads 6 are located at the bottom of the bearing plate 7, serving to buffer and adjust the load. Through its elastic deformation, the length and stress state of the suspenders between the main cable and the bearing plate 7 can be adjusted, thereby reducing the live load stress amplitude of the end suspenders 2. The elastic pad 6 can also absorb and disperse the vibration and impact from the suspenders 2, improving the durability of the bridge. The anchorage 5 is located at the bottom of the elastic pad 6, which disperses and transmits the suspender anchoring force to the elastic pad 6. The anchorage 5 is designed to withstand the load from the elastic pad 6 and the suspenders 2 and transmit it to the anchor plate 4. The anchor plate 4 is located at the bottom of the anchorage 5, which disperses and transmits the force. The anchor plate 4 can withstand the load from the stiffening girder and distribute it evenly. The anchorages are evenly distributed in the anchorage seats 5; the anchorages 3 are used to anchor the suspenders 2, ensuring the stability and safety of the suspenders 2. The anchorages 3 can withstand the tension from the suspenders 2 and transfer it to the anchor plate 4. Through the cooperation of the suspenders 2 and the anchor plate 4, the anchorages 3 can ensure the stability and reliability of the suspenders 2 during bridge use; the limiting plate 8 is fixedly installed on the three sides of the bearing plate 7. Through cooperation with the steel box girder diaphragm, it is used to limit the horizontal movement of the elastic pad 6, so that it only undergoes axial deformation. Through the fixed connection with the bearing plate 7 and the stiffening beam top plate 1, the limiting plate 8 can ensure the stability of the elastic pad during the stress process.

[0041] like Figure 2-3As shown, the anchoring base 5 has an installation hole 51 in the middle for the sling 2 to pass through, making the installation and replacement of the sling 2 more convenient and quick. A stiffening rib plate 52 is fixedly installed at the diagonal. The vertical surface of the stiffening rib plate 52 is a right trapezoid. Its main function is to increase the rigidity of the anchoring base 5 and improve its resistance to deformation. The shape of the right trapezoid allows the stiffening rib plate to better disperse stress when under force, avoiding excessive local stress that could lead to damage. The stiffening rib plate can effectively transfer and disperse the load, ensuring the stability and safety of the entire anchoring device.

[0042] like Figure 4 As shown, the elastic pad 6 is disposed between the pressure plate 7 and the anchor seat 5. It includes N layers of stiffening steel plates 62 and N+1 layers of rubber layers 61. The stiffening steel plates 62 and rubber layers 61 are spaced apart and have a through hole in the middle so that the sling 2 can pass through. The stiffening steel plates 62 enhance the structural strength and rigidity of the elastic pad 6, ensuring that it will not deform or be damaged excessively when subjected to the tension of the sling 2. The rubber layers 61 provide elasticity and cushioning, which can absorb and reduce the vibration and impact caused by the force change of the sling 2. The spaced arrangement of the stiffening steel plates 62 and rubber layers 61 realizes the combination of rigid and flexible materials, so that the elastic pad 6 has both sufficient strength and provides the necessary elasticity. During the operation of the elastic pad 6, the elastic pad can help adjust the length and stress state of the sling between the main cable and the pressure plate 7, ensuring that the optimal mechanical performance is maintained under different operating conditions and reducing the amplitude of live load stress.

[0043] Furthermore, the pressure plate 7 has a circular hole in the middle through which the sling 2 can pass, and the center of the circular hole coincides with the center of the through hole of the elastic pad 6. This ensures that the force applied by the sling 2 can be accurately transmitted to the elastic pad 6 along the axial direction, guaranteeing effective force transmission and avoiding unintended stress distribution that may be caused by eccentric loading.

[0044] Furthermore, anchoring devices with different stiffnesses can be achieved by adjusting the number of layers, materials, thickness, or shape of the stiffening steel plate 62 and rubber layer 61 that make up the elastic pad 6, so as to adapt to the stress requirements of different slings 2. By flexibly adjusting the parameters of the elastic pad 6, the stress characteristics of various slings 2 can be precisely matched to ensure that the slings 2 can maintain stable performance under different working conditions.

[0045] Specifically, the elastic pad 6 can generate corresponding elastic deformation according to the magnitude of the cable force of the sling 2. When the cable force of the sling 2 increases, the elastic pad 6 is compressed, which is equivalent to increasing the length of the sling between the main cable and the pressure plate 7, reducing the force on the sling 2, transferring the load to the adjacent slings, so that the end sling and its adjacent slings share the force, reducing the live load stress amplitude of the end sling, and significantly reducing the risk of fatigue failure of the end sling.

[0046] Furthermore, the top of the limiting plate 8 is fixedly connected to the bottom of the stiffening beam top plate 1, and the side is fixedly connected to the stiffening beam diaphragm. When the cable force of the sling 2 increases, the sling 2 drives the anchor seat to move towards the pressure plate 7. The limiting plate 8 and the stiffening beam diaphragm cooperate with each other to restrict the lateral movement of the elastic pad 6, ensuring that the elastic pad 6 deforms only along the axial direction when subjected to load changes, thereby achieving precise control of the deformation mode.

[0047] Furthermore, the vertical length of the limiting plate 8 is greater than the distance from the stiffening beam top plate 1 to the anchor seat 5 when the elastic pad 6 is not under force, so that the elastic pad 6 can only undergo axial deformation during the operation of the anchoring device, effectively preventing the elastic pad 6 from undergoing lateral or torsional deformation when under force, thus ensuring the stability and reliability of the structure.

[0048] Furthermore, the anchoring device is set at the anchorage of the stiffening girder and the 2-3 pairs of suspenders on the outside of the suspension zone of the cable-stayed-suspension cooperative system bridge. By utilizing the stiffness difference between the different suspenders 2, the proportion of live load borne by the suspenders 2 is distributed, and the live load originally concentrated at the end suspender 2 is evenly distributed to the 3-4 pairs of suspenders on the outside, thereby reducing the live load stress amplitude of the end suspenders, reducing the risk of damage caused by overload, and extending the service life of the suspenders.

[0049] The working principle of the anchoring device: When a car or other live load acts on the cable-stayed section near the suspension section, the load is transferred to the suspension section through the main beam. First, the load is transferred to the anchoring device through the main beam, and then from the anchoring device to the end suspender 2 (the first suspender of the suspension section). When the load is transferred to the anchoring device, the rubber layer 61 in the elastic pad 6 undergoes corresponding elastic deformation according to the magnitude of the cable force of the suspender 2. When the cable force of the suspender 2 increases, since the bearing plate 7 is fixedly connected to the cross diaphragm of the steel box girder, the cable force of the suspender 2 acts on the anchor seat 5, which compresses the rubber layer 61 in the elastic pad 6. This is equivalent to increasing the length of the suspender 2 between the main cable and the bearing plate 7, reducing the force on the suspender 2, and transferring the load to the adjacent suspenders. This allows the end suspender and its adjacent suspenders to share the force, reducing the live load stress amplitude of the end suspender and significantly reducing the risk of fatigue failure of the end suspender.

[0050] The present invention relates to an anchoring device for improving the stress on the end cables of a cable-stayed-suspension bridge. This device adds an elastic pad 6 between the bearing plate 7 and the anchorage seat 5. The elastic pad 6 is composed of N layers of stiffening steel plates 52 and N+1 layers of rubber 51 arranged at intervals. The elastic pad 6 can generate corresponding elastic deformation according to the magnitude of the cable force of the cable 2. When the cable force of the cable 2 increases, the elastic pad 6 is compressed, which is equivalent to increasing the cable length between the main cable and the bearing plate 7, reducing the stress on the cable 2, lowering the anchorage stiffness of the cable 2 on the main beam, and adjusting the stress distribution of the cable 2 in a local area. This avoids the fatigue failure of the cable 2 caused by excessive stress on the end cables 2 due to traditional rigid anchoring. By setting anchoring devices at the anchorage points of the cable 2 and the stiffening beam on 2-3 pairs outside the suspension zone of the cable-stayed bridge, the load is evenly distributed to the local cable area by utilizing the difference in cable anchorage stiffness, automatically adjusting the stress state of the cable to keep it in the optimal working state, significantly alleviating the problem of cable stress concentration, and improving the safety and durability of the bridge structure.

[0051] Example 2

[0052] Combination Figure 1-5 ,like Figure 6 As shown, the present invention provides a method for manufacturing an anchoring device to improve the stress on the end cables of a cable-stayed-suspension bridge, comprising the following steps:

[0053] S100: Based on the bridge design parameters, a full-bridge finite element model is established using finite element analysis software to simulate the stress state of the bridge under different load conditions. Spring elements are used to simulate the anchorage position of the suspender 2 at the bridge end and the main beam. The spring elements simulate the anchorage device.

[0054] S200: Apply an initial stiffness k to the spring and calculate the stress amplitude of the end cable and adjacent cables under the load of a car or train. Assume that the calculated stress amplitude of the end cable is σ1 and the stress amplitude of the second cable is σ2.

[0055] S300: Compare the magnitudes of σ1 and σ2. If σ1 is greater than σ2, it indicates that the force borne by the suspension cable 2 at the bridge end is too large. The spring stiffness k value should be reduced and the calculation should be recalculated. Conversely, the spring stiffness k value should be increased until σ1 and σ2 are close.

[0056] S400: Based on the calculated k value, design the material, thickness, shape and size of the stiffening steel plate 62 and rubber layer 61 in the elastic pad 6 so that the stiffness of the elastic pad 6 is equal to the calculated spring stiffness.

[0057] S500: The remaining structure of the anchoring device is made according to the size of the elastic pad 6, including the sling 2, anchor 3, anchor plate 4, anchor seat 5, elastic pad 6, pressure plate 7 and limiting plate (8).

[0058] S600: Install the anchoring device on the bridge according to the design drawings and construction plan, and conduct long-term health monitoring of the bridge after installation to ensure the effectiveness of the anchoring device and the overall safety of the bridge.

[0059] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An anchorage device for improving the force of the cable of a cable-suspender hybrid bridge end, characterized in that, The application relates to a cable anchorage device for a cable-stayed suspension cable cooperation system bridge. The elastic pad (6) is arranged between the pressure-bearing plate (7) and the anchoring base (5), and comprises N layers of stiffened steel plates (62) and N+1 layers of rubber layers (61); the stiffened steel plates (62) and the rubber layers (61) are arranged at intervals and are provided with through holes, so that the cable (2) can pass through the holes. The anchoring devices with different rigidity are realized by adjusting the parameters of the layers, materials, thicknesses or shapes of the stiffened steel plates (62) and the rubber layers (61) of the elastic pad (6), so as to adapt to the stress requirements of different cables (2).

2. The anchorage device for improving the force of the cable of the cable-stayed suspension bridge according to claim 1, characterized in that, The elastic pad (6) can produce corresponding elastic deformation according to the cable force of the cable (2); when the cable force of the cable (2) increases, the elastic pad (6) is compressed, the length of the cable (2) between the main cable and the pressure-bearing plate (7) is increased, and the stress of the cable (2) is reduced.

3. The anchorage device for improving the force of the cable of the cable-stayed suspension bridge according to claim 2, characterized in that, The top of the limiting plate (8) is fixedly connected with the bottom of the stiffened beam top plate (1), and the side surface is fixedly connected with the stiffened beam cross plate.

4. The anchorage device for improving the cable force of the stay-cable-suspender cooperative bridge end suspension cable according to any one of claims 1-3, characterized in that, The vertical length of the limiting plate (8) is greater than the distance from the stiffened beam top plate (1) to the anchoring base (5) when the elastic pad (6) is not stressed.

5. The anchorage device for improving the force of the cable of the cable-stayed suspension bridge according to claim 4, characterized in that, The pressure-bearing plate (7) is provided with a round hole in the middle for the cable (2) to pass through.

6. The anchorage device for improving the force of the cable of the cable-stayed suspension bridge according to any one of claims 1-3, characterized in that, The anchoring base (5) is provided with a mounting hole (51) in the middle for the cable (2) to pass through, and is fixedly provided with a stiffened rib plate (52) with increased rigidity at diagonal positions; the vertical surface of the stiffened rib plate (52) is a right-angled trapezoid.

7. The anchorage device for improving the force of the cable of the cable-stayed suspension bridge according to any one of claims 1-3, characterized in that, The anchoring device is arranged at the anchoring positions of 2-3 cables (2) and stiffened beams outside the suspension cable area of the cable-stayed suspension cable cooperation system bridge.

8. The anchorage device for improving the force of the cable of the cable-stayed suspension bridge according to any one of claims 1-3, characterized in that, The method comprises the following steps:

9. A method for manufacturing the anchorage device for improving the cable force of the end cable of a cable-stayed suspension bridge according to any one of claims 1 to 8, characterized in that, S100: according to bridge design parameters, a full-bridge finite element model is established by using finite element analysis software, the stress state of the bridge under different load conditions is simulated, a spring element is used to simulate the anchoring position of the cable (2) and the main beam at the bridge end, and the spring element simulates the anchoring device; S200: an initial rigidity k is applied to the spring, the stress amplitude of the end cable and the adjacent cable under the action of automobile or train load is calculated, and it is assumed that the stress amplitude of the end cable is sigma 1 and the stress amplitude of the second cable is sigma 2. ​ S300: Compare σ1 and σ2, if σ1 is greater than σ2, it means that the force of the sling (2) at the end of the bridge is too large, the spring stiffness k value should be reduced, and the calculation should be performed again, otherwise, the spring stiffness k value should be increased until σ1 and σ2 are close; S400: According to the calculated k value, the materials, thickness, shape and size of the stiffened steel plate (62) and the rubber layer (61) in the elastic pad (6) are designed, so that the stiffness of the elastic pad (6) is equal to the calculated spring stiffness; S500: According to the size of the elastic pad (6), the remaining structure of the anchoring device is made, including the sling (2), the anchor (3), the anchor pad (4), the anchoring seat (5), the elastic pad (6), the pressure plate (7) and the limiting plate (8); S600: According to the design drawing and construction scheme, the anchoring device is installed on the bridge, and the long-term health monitoring of the installed bridge is carried out to ensure the effectiveness of the anchoring device and the overall safety of the bridge.

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