Anchoring device for improving stress of sling at cable-stayed-suspended cooperative bridge end and manufacturing method

Abstract

The invention discloses an anchoring device for improving stress of a sling at the end of a cable-stayed-suspended cooperative bridge and a manufacturing method, the device comprises a bearing plate, the bearing plate is arranged at the bottom of a stiffening beam top plate, the sling is arranged in the stiffening beam top plate in a penetrating mode, and an elastic cushion block is arranged at the bottom of the bearing plate; the elastic cushion block is used for adjusting the length and the stress state of the sling between the main cable and the bearing plate so as to reduce the live load stress amplitude of the end sling, the bottom of the elastic cushion block is provided with an anchoring base, the bottom of the anchoring base is provided with an anchor bearing plate, the bottom of the anchor bearing plate is provided with an anchorage device used for anchoring the sling, and one side of the bearing plate is fixedly connected with a stiffening beam diaphragm plate. Limiting plates are fixedly installed on the three side faces of the elastic cushion block and used for limiting the elastic cushion block to move in the horizontal direction. According to the anchoring device for end sling stress, corresponding elastic deformation can be generated according to the size of sling force, the anchoring rigidity of the sling on a main beam is reduced, sling stress distribution in a local area is adjusted, and fatigue damage of the sling caused by too large end sling stress due to traditional rigid anchoring is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and more specifically, relates to an anchoring device and a manufacturing method for improving the stress of a suspension cable at an end of a cable-stayed-suspension cooperative bridge. Background Art

[0002] Cable-stayed-cable cooperative bridges have been gradually applied in super-long span bridges because they have larger spans than cable-stayed bridges and higher stiffness than suspension bridges, combining the advantages of cable-stayed bridges and suspension bridges. In recent years, my country has successively built cable-stayed-cable cooperative bridges such as the Xihoumen Highway-Railway Dual-Use Cross-Sea Bridge, the G3 Tongling Yangtze River Highway-Railway Dual-Use Bridge, and the Jingzhou Libu Yangtze River Highway-Railway Bridge. This cooperative system optimizes the overall stress performance of the structure through the combined stress of the cable-stayed system and the suspension system. However, in actual engineering applications, a prominent technical difficulty of the cable-stayed-cable cooperative bridge is that at the connection between the cable-stayed section and the suspension section, the stress amplitude of the suspension section end cable (the first cable adjacent to the cable-stayed cable) under live load is much greater than that of other cables, and fatigue failure is prone to occur.

[0003] The reason why the stress amplitude of the end cable is significantly greater than that of the other cables is that when the car or other live load acts on the inclined section close to the suspension section, the load is transmitted to the suspension section through the main beam, and first transmitted to the end cable (the first cable of the suspension section). Since the elongation of the end cable is small, the first cable bears most of the load. The axial stiffness of the end cable is too large, resulting in the other cables not being able to fully play their role. If the axial stiffness of the first cable can be reduced, the load borne by the first cable will be reduced, and its stress amplitude will also be reduced.

[0004] At present, the technical means commonly used in engineering to improve the excessive stress amplitude of the end suspension cable are as follows: ① Set up a transition zone between the inclined section and the suspension section, set up both inclined cables and suspension cables in the transition zone, and usually set up 6-9 pairs of cross cables; ② Use a larger stiffening beam section to increase the stiffness of the stiffening beam; ③ Increase the cross-sectional area of ​​the end suspension cable to reduce the live load stress amplitude of the end suspension cable; ④ Set up auxiliary piers in the side span to increase the overall stiffness of the structure. Several methods are often used in combination. Several cable-stayed-suspension cooperative systems that have been built or are under construction have set up transition zones between inclined cables and suspension cables. The above-mentioned methods of reducing the stress amplitude of the end suspension cable have the disadvantages of increasing the number of components and the amount of materials used, which reduces the economic performance of the structure. In particular, when setting up the transition zone between the inclined section and the suspension section, multiple pairs of cross cables are often required to effectively reduce the stress amplitude of the end suspension cable. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an anchoring device and a manufacturing method for improving the stress of the end cables of a cable-stayed-suspension cooperative bridge, by adding an elastic pad between the pressure plate and the anchor seat, the elastic pad is arranged by N layers of stiffening steel plates and N+1 layers of rubber layers, the elastic pad can produce corresponding elastic deformation according to the size 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, reducing the stress of the cable, reducing the anchoring stiffness of the cable on the main beam, adjusting the force distribution of the cable in the local area, and avoiding the fatigue damage of the cable caused by excessive stress on the end cable caused by traditional rigid anchoring; Anchoring devices are installed at the anchorage points of 2 to 3 pairs of cables and stiffening beams outside the suspension area of ​​the cooperative system bridge. The difference in cable anchoring stiffness is used to evenly distribute the load to the local cable area, and the stress state of the cables is automatically adjusted to keep them in the best working state at all times, significantly alleviating the problem of concentrated stress on the cables and improving the safety and durability of the bridge structure. Compared with technical means such as increasing the number of crossing cables, increasing the stiffness of the main beam and setting auxiliary piers in the side spans, only local modification of the anchoring points is required, which greatly reduces the demand for additional materials, thereby effectively controlling the engineering cost and improving the economic performance of the project. It will not lead to a significant increase in the deadweight of the bridge structure, and is suitable for application in large-span bridge structures.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an anchoring device for improving the stress of the end sling of a cable-stayed-suspension cooperative bridge, comprising a pressure plate, the pressure plate being arranged at the bottom of the top plate of the stiffening beam, the top plate of the stiffening beam being provided with a sling penetrating therein, and an elastic pad being arranged at the bottom of the pressure plate for adjusting the length and stress state of the sling between the main cable and the pressure plate, so as to reduce the live load stress amplitude of the end sling, adjust the force distribution of the sling in the local area, and avoid fatigue damage of the sling due to excessive force on the end sling;

[0007] An anchor seat is provided at the bottom of the elastic pad, 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 limiting plates are fixedly installed on three sides for limiting the horizontal movement of the elastic pad so that it only undergoes axial deformation.

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

[0009] Furthermore, anchoring devices with different stiffness are realized by adjusting the number of layers, material, thickness or shape parameters of the stiffening steel plates and rubber layers constituting the elastic pads to adapt to the force requirements of different slings.

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

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

[0012] Furthermore, the vertical length of the limit plate is greater than the distance from the top plate of the stiffening beam to the anchor seat when the elastic pad is not subjected to force.

[0013] Furthermore, a round hole is provided in the middle of the pressure plate so that the sling can pass through it.

[0014] Furthermore, a mounting hole for the sling to pass through is provided in the middle of the anchor seat, and a stiffening rib plate for increasing rigidity is fixedly installed at the diagonal position, and the vertical surface of the stiffening rib plate is a right-angled trapezoid.

[0015] Furthermore, the anchoring device is arranged at the anchoring positions of 2 to 3 pairs of cables and stiffening beams outside the cable-stayed-cable cooperative system bridge cable area.

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

[0017] S100: Based on the bridge design parameters, the finite element model of the whole bridge is established using finite element analysis software to simulate the stress state of the bridge under different load conditions. The spring unit is used to simulate the anchoring position of the end cable and the main beam. The spring unit simulates the anchoring device;

[0018] S200: applying an initial stiffness k to the spring, calculating the stress amplitude of the end sling and the adjacent sling under the load of the car or train, assuming that the calculated stress amplitude of the end sling is σ1, and the stress amplitude of the second sling is σ2;

[0019] S300: Compare σ1 and σ2. If σ1 is greater than σ2, it means that the force borne by the end sling is too large. The spring stiffness k value should be reduced and recalculated. Otherwise, the spring stiffness k value should be increased until σ1 is close to σ2.

[0020] S400: designing the material, thickness, shape and size of the stiffening steel plate and the rubber layer in the elastic pad according to the calculated k value so that the stiffness of the elastic pad is equal to the calculated spring stiffness;

[0021] S500: manufacturing the remaining structures of the anchoring device according to the size of the elastic pad, including the sling, anchor, anchor plate, anchor seat, elastic pad, pressure plate and limit plate;

[0022] S600: Install anchors on bridges according to design drawings and construction plans, and conduct long-term health monitoring of installed bridges to ensure the effectiveness of anchors and overall safety of bridges.

[0023] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0024] 1. The anchoring device for end cable stress of the present invention adds an elastic pad between the pressure plate and the anchor seat. The elastic pad is arranged by N layers of stiffening steel plates and N+1 layers of rubber layers. The elastic pad can produce corresponding elastic deformation according to the size of the cable force. When the cable force increases, the elastic pad is compressed, which is equivalent to increasing the length of the cable from the main cable to the pressure plate, reducing the cable stress, reducing the anchoring stiffness of the cable on the main beam, adjusting the cable stress distribution in the local area, and avoiding the fatigue damage of the cable caused by excessive stress on the end cable due to traditional rigid anchoring.

[0025] 2. Compared with other technical approaches such as increasing the number of cross cables, increasing the main beam rigidity and setting auxiliary piers at the side spans, the end-cable-loaded anchoring device of the present invention only requires partial modification of the anchoring points, greatly reducing the demand for additional materials, thereby effectively controlling engineering costs and improving the economic performance of the project. It will not lead to a significant increase in the deadweight of the bridge structure and is therefore suitable for applications in large-span bridge structures.

[0026] 3. The end cable stress anchoring device of the present invention arranges anchoring devices at the anchoring positions of 2 to 3 pairs of cables and stiffening beams outside the suspension area of ​​the cooperative system bridge, utilizes the difference in cable anchoring stiffness to evenly distribute the load to the local cable area, automatically adjusts the stress state of the cables, keeps them in the best working state at all times, significantly alleviates the problem of cable stress concentration, and improves the safety and durability of the bridge structure.

[0027] 4. The end sling force anchoring device of the present invention has shown significant advantages in the installation and replacement process through the modular design of the anchoring device. Compared with other improvement technical means, it also effectively controls the subsequent maintenance costs and improves the overall operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Figure 2 A top view of an anchoring seat of an anchoring device for improving the stress of a cable at an end of a cable-stayed and cable-suspended bridge according to an embodiment of the present invention;

[0030] Figure 3This is a vertical view of an anchor seat of an anchor device for improving the stress of the cable at the end of a cable-stayed and cable-suspended bridge according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the elastic pad structure of an anchor device for improving the stress of the cable at the end of a cable-stayed-suspension cooperative bridge according to an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the installation position of an anchoring device for improving the stress of the sling cable at the end of a cable-stayed-suspension cooperative bridge according to an embodiment of the present invention;

[0033] Figure 6 The present invention is a schematic flow chart of a method for manufacturing an anchoring device for improving the stress of suspension cables at the end of a cable-stayed and suspension-cable cooperative bridge according to an embodiment of the present invention.

[0034] In all the drawings, the same figure marks represent the same technical features, specifically: 1-stiffening beam top plate, 2-sling, 3-anchor, 4-anchor pad, 5-anchor seat, 51-mounting hole, 52-stiffening rib plate, 6-elastic pad, 61-rubber layer, 62-stiffening steel plate, 7-pressure plate, 8-limiting plate. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present 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 indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0039] Example 1

[0040] like Figure 1-5As shown, an embodiment of the present invention provides an anchoring device for improving the stress of the end sling of a cable-stayed-suspension cooperative bridge, including a pressure plate 7, the pressure plate 7 is arranged at the bottom of the stiffening beam top plate 1, the stiffening beam top plate 1 is provided with a sling 2 running through it, the bottom of the pressure plate 7 is provided with an elastic pad 6, which is used to adjust the length and stress state of the sling 2 between the main cable and the pressure plate 7 to reduce the live load stress amplitude of the end sling, the bottom of the elastic pad 6 is provided with an anchor seat 5, the bottom of the anchor seat 5 is provided with an anchor pad 4, the bottom of the anchor pad 4 is provided with an anchor 3 for anchoring the sling 2, and one side of the pressure plate 7 is connected to the stiffening beam cross diaphragm Fixed connection, with limit plates 8 fixedly installed on three sides for limiting the horizontal movement of the elastic pad 6, the top of the limit plate 8 is fixedly connected to the bottom of the stiffening beam top plate 1; the pressure plate 7 is arranged at the bottom of the stiffening beam top plate 1, which plays a role of support and force transmission, and is fixedly connected to the stiffening beam cross diaphragm to enhance the stability of the entire anchor device; the sling 2 runs through the inside of the stiffening beam top plate, which plays a role of connection and support, and the load on the stiffening beam is transferred to the anchor device, and the anchor device further transfers the load to the main cable through the sling 2; the elastic pad 6 is arranged at the bottom of the pressure plate 7, which plays a role of buffering and adjustment, Through its elastic deformation, the length and stress state of the sling between the main cable and the pressure plate 7 can be adjusted, thereby reducing the live load stress amplitude of the end sling 2. The elastic pad 6 can also absorb and disperse the vibration and impact from the sling 2, thereby improving the durability of the bridge; the anchor seat 5 is arranged at the bottom of the elastic pad 6, and plays a role in dispersing and transmitting the anchoring force of the sling to the elastic pad 6. The design of the anchor seat 5 can withstand the load from the elastic pad 6 and the sling 2, and transmit it to the anchor pad 4; the anchor pad 4 is arranged at the bottom of the anchor seat 5, and plays a role in dispersing and transmitting force. The anchor pad 4 can withstand the load from the stiffening beam and evenly distribute it Evenly distributed in the anchor seat 5; the anchor 3 is used to anchor the sling 2 to ensure the stability and safety of the sling 2. The anchor 3 can withstand the tension from the sling 2 and transfer it to the anchor plate 4. Through the cooperation of the sling 2 and the anchor plate 4, the anchor 3 can ensure the stability and reliability of the sling 2 during the use of the bridge; the limit plate 8 is fixedly installed on the three sides of the pressure plate 7, and is used to limit the horizontal movement of the elastic pad 6 by cooperating with the steel box girder cross diaphragm so that it only undergoes axial deformation. Through the fixed connection with the pressure plate 7 and the stiffening beam top plate 1, the limit plate 8 can ensure the stability of the elastic pad during the force-bearing process.

[0041] like Figure 2-3As shown, a mounting hole 51 for the sling 2 to pass through is provided in the middle of the anchor seat 5, making the installation and replacement of the sling 2 more convenient and quick. A stiffening rib plate 52 is fixedly installed at the diagonal portion. The vertical surface of the stiffening rib plate 52 is a right-angled trapezoid. Its main function is to increase the rigidity of the anchor seat 5 and improve its ability to resist deformation. The shape of the right-angled trapezoid enables the stiffening rib plate to better disperse stress when subjected to force, thereby avoiding damage caused by excessive local stress. The stiffening rib plate can effectively transfer and disperse the load, thereby ensuring the stability and safety of the entire anchor device.

[0042] like Figure 4 As shown, the elastic pad 6 is arranged between the pressure plate 7 and the anchor seat 5, and includes N layers of stiffening steel plates 62 and N+1 layers of rubber layers 61. The stiffening steel plates 62 and the rubber layers 61 are arranged at intervals, and a through hole is provided in the middle so that the sling 2 can pass through it; the stiffening steel plates 62 enhance the structural strength and rigidity of the elastic pad 6, ensuring that it will not be excessively deformed or damaged when subjected to the tension of the sling 2. The rubber layer 61 provides elasticity and buffering effects, which can absorb and reduce vibrations and impacts caused by changes in the force of the sling 2. The combination of rigid and flexible materials is achieved by the interval arrangement of the stiffening steel 62 and the rubber layer 61, so that the elastic pad 6 has both sufficient strength and necessary elasticity. During the operation of the elastic pad 6, the elastic pad can help adjust the length and stress state of the sling from the main cable to the pressure plate 7, ensuring that the best mechanical properties are maintained under different conditions of use and reducing the amplitude of live load stress.

[0043] Furthermore, a circular hole is provided in the middle of the pressure plate 7 so that the sling 2 can pass through it, 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, thereby ensuring effective force transmission and avoiding unexpected stress distribution that may be caused by eccentric loading.

[0044] Furthermore, anchoring devices with different stiffness are realized by adjusting the parameters of the number of layers, material, thickness or shape of the stiffening steel plates 62 and rubber layers 61 that constitute the elastic pad 6, so as to adapt to the force requirements of different slings 2; by flexibly adjusting the parameters of the elastic pad 6, the force characteristics of various slings 2 can be accurately matched to ensure that the sling 2 can maintain stable performance under different working conditions.

[0045] Specifically, the elastic pad 6 can produce corresponding elastic deformation according to the size 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, and transferring the load to the adjacent slings, so that the end sling and several adjacent slings are subjected to force together, reducing the live load stress amplitude of the end sling, and greatly reducing the risk of fatigue damage of the end sling.

[0046] Furthermore, the top of the limit 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 cross-plate. When the cable force of the sling 2 increases, the sling 2 drives the anchor seat to move toward the pressure plate 7, and the limit plate 8 and the stiffening beam cross-plate cooperate with each other to limit the lateral movement of the elastic pad 6, ensuring that the elastic pad 6 only deforms along the axial direction when subjected to load changes, thereby achieving precise control of the deformation mode.

[0047] Furthermore, the vertical length of the limit 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 subjected to stress, so that it can ensure that the elastic pad 6 can only undergo axial deformation during operation of the anchor device, effectively preventing the elastic pad 6 from undergoing lateral or torsional deformation when subjected to stress, thereby ensuring the stability and reliability of the structure.

[0048] Furthermore, the anchoring device is arranged at the anchorage of 2 to 3 pairs of cables and the stiffening beam outside the suspension area of ​​the cable-stayed-suspension cooperative system bridge. Through the stiffness difference between different cables 2, the live load proportion borne by the cable 2 is distributed, and the live load originally concentrated at the end cable 2 is evenly dispersed to the 3-4 pairs of cables on the outside, thereby reducing the live load stress amplitude of the end cable, reducing the risk of damage caused by overload, and extending the service life of the cable.

[0049] Working principle of the anchoring device: when a car or other live load acts on the inclined-stayed section close to the suspension section, the load is transmitted to the suspension section through the main beam. First, the load is transmitted to the anchoring device through the main beam, and then transmitted to the end cable 2 (the first cable of the suspension section) by the anchoring device. When the load is transmitted to the anchoring device, the rubber layer 61 in the elastic pad 6 produces corresponding elastic deformation according to the size of the cable force of the cable 2. When the cable force of the cable 2 increases, since the pressure plate 7 is fixedly connected to the cross-diaphragm of the steel box girder, the cable force of the cable 2 acts on the anchor seat 5, causing the rubber layer 61 in the elastic pad 6 to be compressed, which is equivalent to increasing the length of the cable 2 between the main cable and the pressure plate 7, reducing the force on the cable 2, and transferring the load to the adjacent cables, so that the end cable and several adjacent cables are subjected to force together, reducing the live load stress amplitude of the end cable, and greatly reducing the risk of fatigue damage of the end cable.

[0050] The anchoring device for improving the stress of the end cables of the cable-stayed-suspension cooperative bridge of the present invention is provided by adding an elastic pad 6 between the pressure plate 7 and the anchor seat 5. The elastic pad 6 is arranged at intervals by N layers of stiffening steel plates 52 and N+1 layers of rubber layers 51. The elastic pad 6 can produce 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 pressure plate 7, reducing the stress of the cable 2, reducing the anchoring stiffness of the cable 2 on the main beam, adjusting the force distribution of the cable 2 in the local area, avoiding fatigue damage of the cable 2 caused by excessive stress on the end cable 2 caused by traditional rigid anchoring, and arranging anchoring devices at the anchoring positions of 2 to 3 pairs of cables 2 and stiffening beams outside the suspension area of ​​the cooperative system bridge, utilizing the difference in cable anchoring stiffness to evenly disperse the load to the local cable area, automatically adjusting the stress state of the cable, making it always in the best 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 for improving the stress of the suspension cable at the end of a cable-stayed-suspension cooperative bridge, comprising the following steps:

[0053] S100: According to the design parameters of the bridge, a finite element model of the whole bridge is established using finite element analysis software to simulate the stress state of the bridge under different load conditions. The spring unit is used for simulation at the anchorage position of the end cable 2 and the main beam, and the spring unit simulates the anchoring device;

[0054] S200: applying an initial stiffness k to the spring, calculating the stress amplitude of the end sling and the adjacent sling under the load of the car or train, assuming that the calculated stress amplitude of the end sling is σ1, and the stress amplitude of the second sling is σ2;

[0055] S300: Compare σ1 and σ2. If σ1 is greater than σ2, it means that the force borne by the end sling 2 is too large. The spring stiffness k value should be reduced and recalculated. Otherwise, the spring stiffness k value should be increased until σ1 is close to σ2.

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

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

[0058] S600: Install anchors on bridges according to design drawings and construction plans, and conduct long-term health monitoring of installed bridges to ensure the effectiveness of anchors and overall safety of bridges.

[0059] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

Claims

1. An anchoring device for improving the stress of the suspension cable at the end of a cable-stayed and suspension-cable cooperative bridge, characterized in that: The invention comprises a pressure plate (7), wherein the pressure plate (7) is arranged at the bottom of the stiffening beam top plate (1), a sling (2) is arranged inside the stiffening beam top plate (1), and an elastic pad (6) is arranged at the bottom of the pressure plate (7) for adjusting the length and stress state of the sling (2) between the main cable and the pressure plate (7), so as to reduce the live load stress amplitude of the end sling, adjust the force distribution of the sling in the local area, and avoid fatigue damage of the sling due to excessive force on the end sling; An anchor seat (5) is provided at the bottom of the elastic pad (6), an anchor plate (4) is provided at the bottom of the anchor seat (5), an anchor (3) for anchoring the sling (2) is provided at the bottom of the anchor plate (4), one side of the pressure plate (7) is fixedly connected to the stiffening beam diaphragm, and limiting plates (8) are fixedly installed on three sides thereof for limiting the horizontal movement of the elastic pad (6) so that it only undergoes axial deformation.

2. The anchoring device for improving the stress of the suspension cable at the end of a cable-stayed and suspension-cable cooperative bridge according to claim 1 is characterized in that: The elastic pad (6) is arranged between the pressure plate (7) and the anchor seat (5), and comprises N layers of stiffening steel plates (62) and N+1 layers of rubber layers (61). The stiffening steel plates (62) and the rubber layers (61) are arranged at intervals, and a through hole is provided in the middle so that the sling (2) can pass through it.

3. The anchoring device for improving the stress of the suspension cable at the end of a cable-stayed and suspension-cable cooperative bridge according to claim 2 is characterized in that: Anchoring devices with different stiffness are realized by adjusting the number of layers, material, thickness or shape parameters of the stiffening steel plate (62) and the rubber layer (61) constituting the elastic pad (6) to adapt to the force requirements of different slings (2).

4. The anchoring device for improving the stress of the suspension cable at the end of a cable-stayed and suspension-cable cooperative bridge according to claim 3 is characterized in that: The elastic pad (6) can produce corresponding elastic deformation according to the size 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 (2) between the main cable and the pressure plate (7), thereby reducing the force on the sling (2).

5. An anchoring device for improving the stress of the sling at the end of a cable-stayed and suspension-cable cooperative bridge according to any one of claims 1 to 4, characterized in that: The top of the limit plate (8) is fixedly connected to the bottom of the stiffening beam top plate (1), and the side surface is fixedly connected to the stiffening beam cross diaphragm.

6. The anchoring device for improving the stress of the suspension cable at the end of a cable-stayed and suspension-cable cooperative bridge according to claim 5 is characterized in that: The vertical length of the limiting plate (8) is greater than the distance from the top plate (1) of the stiffening beam to the anchor seat (5) when the elastic pad (6) is not subjected to force.

7. An anchoring device for improving the stress of the suspension cable at the end of a cable-stayed and suspension-cable cooperative bridge according to any one of claims 1 to 4, characterized in that: A round hole is provided in the middle of the pressure plate (7) so that the sling (2) can pass through it.

8. An anchoring device for improving the stress of the suspension cable at the end of a cable-stayed and suspension-cable cooperative bridge according to any one of claims 1 to 4, characterized in that: A mounting hole (51) for the sling (2) to pass through is provided in the middle of the anchor seat (5), and a stiffening rib plate (52) for increasing rigidity is fixedly installed at the diagonal position, and the vertical surface of the stiffening rib plate (52) is a right-angled trapezoid.

9. An anchoring device for improving the stress of the sling at the end of a cable-stayed and cable-suspended bridge according to any one of claims 1 to 4, characterized in that: The anchoring device is arranged at the anchoring position of 2 to 3 pairs of suspension cables (2) and the stiffening beam outside the suspension area of ​​the cable-stayed-cable cooperative system bridge.

10. A method for manufacturing an anchoring device for improving the stress of the sling at the end of a cable-stayed and suspension-cable cooperative bridge according to any one of claims 1 to 9, characterized in that: The steps include: S100: Based on the design parameters of the bridge, a finite element model of the entire bridge is established using finite element analysis software to simulate the stress state of the bridge under different load conditions. A spring unit is used to simulate the anchoring position of the end suspension cable (2) and the main beam, and the spring unit simulates the anchoring device; S200: applying an initial stiffness k to the spring, calculating the stress amplitude of the end sling and the adjacent sling under the load of the car or train, assuming that the calculated stress amplitude of the end sling is σ1, and the stress amplitude of the second sling is σ2; S300: Compare σ1 and σ2. If σ1 is greater than σ2, it means that the force borne by the end sling (2) is too large. The spring stiffness k value should be reduced and the calculation should be repeated. Otherwise, the spring stiffness k value should be increased until σ1 is close to σ2. S400: designing the material, thickness, shape and size of the stiffening steel plate (62) and the rubber layer (61) in the elastic pad (6) according to the calculated k value, so that the stiffness of the elastic pad (6) is equal to the calculated spring stiffness; S500: manufacturing the remaining structures of the anchoring device according to the size of the elastic pad (6), including the sling (2), the anchor (3), the anchor plate (4), the anchor seat (5), the elastic pad (6), the pressure plate (7) and the limit plate (8); S600: Install anchors on bridges according to design drawings and construction plans, and conduct long-term health monitoring of installed bridges to ensure the effectiveness of anchors and overall safety of bridges.

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