Large-deformation multidirectional limiting inhaul cable device for bridge

Abstract

The invention discloses a large-deformation multidirectional limiting inhaul cable device for a bridge, which comprises an anchoring component, a limiting component and an inhaul cable, and the limiting component is divided into an upper limiting component and a lower limiting component; the anchoring assembly is divided into an upper anchoring assembly and a lower anchoring assembly; the inhaul cable is mainly made of a novel negative Poisson's ratio (NPR) material. The anchoring assembly is pre-buried in a bridge structure at a bridge support and is used for mounting the limiting assembly; the interior of the limiting assembly is of a pottery-pot-shaped variable-diameter cavity structure, so that the two ends of the inhaul cable can be fixedly connected to the limiting assembly correspondingly, and therefore the whole inhaul cable device is formed, the device and a bridge support have the mutual synergistic effect, displacement deformation of a bridge is limited in multiple angles and multiple directions, the earthquake disaster resisting capacity of the whole bridge is improved, and the service life of the bridge is prolonged. And in addition, the device in the scheme is simple and clear in structural design, and installation, disassembly, maintenance and the like of the device in the scheme can be completed with relatively short time cost and relatively low economic cost.

Description

Technical Field

[0001] The present invention relates to the field of shock absorption devices for improving the seismic performance of bridges in civil engineering, and is mainly used to limit the large deformation of the overall bridge during an earthquake epicenter, and particularly relates to a large-deformation multi-directional limiting cable device for bridges. Background Art

[0002] During the design and construction of bridges, most of them need to follow relevant codes and policies to implement corresponding seismic measures to avoid and mitigate the casualties and economic losses caused by earthquakes. In bridge structures, bridge bearings are important force-transferring devices that connect the upper structure and the lower structure of the bridge. They can transfer the reaction force and deformation of the upper structure of the bridge to the lower structure of the bridge, ensuring the balanced and reasonable overall force of the bridge structure, and are one of the key components that need to be focused on in bridge seismic design.

[0003] Currently, there are many types of traditional bridge seismic bearings in use, including friction pendulum bearings, plate rubber bearings, and seismic pot bearings, etc. These bearings can all well reduce the impact of earthquakes on bridges in the horizontal direction and significantly improve the overall seismic capacity of bridges, but they are slightly insufficient in the vertical direction. Although various new types of bridge bearings emerge in an endless stream, and many bearings can limit the impact of earthquakes on bridges in the vertical direction to varying degrees, most of them have limitations such as high cost or difficult construction, making their practicability and applicability not extensive. Therefore, it is necessary to propose a bridge device that can effectively reduce the impact of earthquakes on bridges in both the vertical and horizontal directions, while also taking into account flexibility, convenience in construction operations and later maintenance, improving the service life of the bridge, and thus further improving the overall seismic performance of the bridge.

[0004] In addition, it should also be noted that since the space where bridge bearings are usually located is relatively narrow and their structures are relatively complex, it often takes a long time and high economic costs to repair the bearings, which brings difficulties to the daily maintenance and installation and disassembly of the bearings. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to propose a large-deformation multi-directional limiting cable device for bridges with a simple structure, reliable implementation, convenient application, and good application results.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A large-deformation multi-directional limiting cable device for bridges, comprising:

[0008] An upper anchoring assembly, pre-embedded in the upper structure of the bridge at the bridge bearing;

[0009] A lower anchoring assembly is pre-buried in the lower structure of the bridge at the bridge support and is opposite to the upper anchoring assembly;

[0010] An upper positioning assembly, fixedly connected to the upper anchor assembly;

[0011] A lower limit assembly, fixedly connected to the lower anchor assembly and opposite to the upper limit assembly;

[0012] One end of the pull cable is inserted upward into the upper limit assembly and fixedly connected to the upper limit assembly, and the other end is inserted downward into the lower limit assembly and fixedly connected to the lower limit assembly.

[0013] As a possible implementation mode, further, the upper anchor assembly described in the present solution includes an upper anchor body, and the upper anchor body is a cylindrical structure with one end open, and a closed end thereof is inserted through and pre-embedded in the upper structure of the bridge at the bridge support.

[0014] Correspondingly, the lower anchor assembly includes a lower anchor body, which is a cylindrical structure with one end open, and a closed end thereof is inserted through and pre-embedded in the lower structure of the bridge at the bridge support.

[0015] Among them, the virtual axes of the upper anchor body and the lower anchor body coincide with each other; the upper limit assembly is fixedly connected in the cylindrical structure of the upper anchor body, and the lower limit assembly is fixedly connected in the cylindrical structure of the lower anchor body.

[0016] As a preferred implementation option, preferably, the outer side of the open end of the upper anchor body described in this scheme is connected to a first square steel plate with a square outer contour, and a first avoidance hole is provided in the middle of the first square steel plate corresponding to the outer peripheral side of the upper anchor body; the outer side of the open end of the lower anchor body is connected to a second square steel plate with a square outer contour, and a second avoidance hole is provided in the middle of the second square steel plate corresponding to the outer peripheral side of the lower anchor body.

[0017] As a preferred implementation option, preferably, in this scheme, the first square steel plate portion is embedded in the bridge superstructure at the bridge support or the lower end surface of the first square steel plate is flush with the surface of the bridge superstructure at the bridge support; the second square steel plate portion is embedded in the bridge substructure at the bridge support or the lower end surface of the second square steel plate is flush with the surface of the bridge substructure at the bridge support.

[0018] As a preferred implementation option, preferably, an anchoring steel bar is provided on the ends of the upper anchor body and the lower anchor body away from their open ends; the cable is made of a negative Poisson's ratio material; and the outer peripheral side of the cable is coated with a rubber layer.

[0019] As a preferred implementation option, preferably, the upper limit component in this solution includes an upper limit main body in a cylindrical structure, whose outer contour is adapted to the inner wall of the cylindrical structure of the upper anchoring main body, and the upper limit main body is fixedly connected to the inner wall of the cylindrical structure of the upper anchoring main body by screw threads; the lower limit component includes a lower limit main body in a cylindrical structure, whose outer contour is adapted to the inner wall of the cylindrical structure of the lower anchoring main body, and the lower limit main body is fixedly connected to the inner wall of the cylindrical structure of the lower anchoring main body by screw threads.

[0020] Wherein, one end of the cable is upwardly inserted into the cylindrical structure of the upper limit main body and fixedly connected to the upper limit main body, and the other end is downwardly inserted into the cylindrical structure of the lower limit main body and fixedly connected to the lower limit main body.

[0021] As a preferred implementation option, preferably, on the outer peripheral side of the end of the upper limit main body close to the open end of the upper anchoring main body, there is a first horizontally extending portion, which is in contact with the first square steel plate; on the outer peripheral side of the end of the lower limit main body close to the open end of the lower anchoring main body, there is a second horizontally extending portion, which is in contact with the second square steel plate.

[0022] As a preferred implementation option, preferably, at the end of the upper limit main body close to the open end of the upper anchoring main body, there is a first polygonal convex portion, which is used to cooperate with an external auxiliary tool to facilitate the threaded connection between the upper limit main body and the upper anchoring main body; at the end of the lower limit main body close to the open end of the lower anchoring main body, there is a second polygonal convex portion, which is used to cooperate with an external auxiliary tool to facilitate the threaded connection between the lower limit main body and the lower anchoring main body.

[0023] As a preferred implementation option, preferably, the end of the upper limit main body connected to the upper anchoring main body is a closed structure, and a first stepped cavity that is wider inside and narrower outside is formed therein; a second stepped cavity that is wider inside and narrower outside is formed inside the lower limit main body.

[0024] Wherein, both the first stepped cavity and the second stepped cavity are filled with a concrete layer to fix the end of the cable therein.

[0025] As a preferred implementation option, preferably, at the end of the lower anchoring main body away from its open end, there is an axially extending portion in a cylindrical structure, the inner diameter of the axially extending portion is smaller than the inner diameter of the cylindrical structure of the lower anchoring main body, both ends of the lower limit main body are open ends, after the lower limit main body is threadedly connected to the lower anchoring main body, the second stepped cavity communicates with the axially extending portion, so that the other end of the cable can be downwardly inserted into the axially extending portion.

[0026] This solution provides a large-deformation multi-directional limit cable device for bridges, which interacts with bridge bearings, restricts the displacement and deformation of bridges in multiple angles and directions, improves the overall earthquake resistance ability of bridges, extends the service life of bridges, and the device structure of this solution is simply designed and clear. It can complete the installation, disassembly, maintenance and other steps of the device of this solution at a relatively short time cost and low economic cost on the premise of ensuring the basic seismic performance.

[0027] Adopting the above technical solution, compared with the prior art, the beneficial effects of the present invention are as follows: In this solution, the upper anchoring component and the lower anchoring component are respectively embedded in the upper and lower parts of the bridge structure at the bridge bearing, and then the upper limit component and the lower limit component are respectively threadedly connected to the upper anchoring component and the lower anchoring component, so that the installation of the limit component has high flexibility and convenience. Especially, the two ends of the cable are respectively fixedly connected to the upper limit component and the lower limit component, so that the cable and the limit component can be conveniently installed and disassembled. When the device of this solution needs to be replaced once it reaches certain conditions, the limit component and the cable can be removed and transferred together by means of thread rotation, without removing the anchoring component embedded in the bridge, avoiding damage to the bridge structure, which is a non-destructive removal for the bridge. In addition, the cable mainly uses negative Poisson's ratio (NPR) materials, making the cable itself have a certain flexibility, which provides certain convenience for the installation and disassembly of the device of the present invention at the bridge bearing where the space is already narrow. And benefiting from the peculiar properties of the special materials of the cable itself, and the materials also have a certain hardness and strength, it can limit the displacement and deformation of the bridge in all directions to a certain extent, having the ability of multi-directional limit. Moreover, according to relevant research, compared with the steel strands made of high-strength steel with a typical strain rate fluctuating in the range of 10 -3 / s -1 ~10 -1 / s -1 under dynamic load, the typical strain rate of the metal-based negative Poisson's ratio (NPR) material is usually in the range of 10 2 / s -1 ~10 3 / s -1 , which is 10 3 ~10 6 times that of the steel strand material. Therefore, in this solution, the cable made of negative Poisson's ratio (NPR) material is significantly superior to the traditional steel strand material, can show better toughness and strength, can better adapt to the large-deformation situation, ensure the continuity of performance, and can be used for a long time. By playing the roles of shock absorption and vibration isolation when working with the bridge bearing together, the seismic performance of the overall bridge structure is more comprehensively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic diagram of the brief state of the cable device in the application implementation of this solution;

[0030] Figure 2 It is a schematic diagram of the brief implementation structure of the cable device in this solution;

[0031] Figure 3 It is a three-dimensional perspective schematic diagram of the brief implementation structure of the upper anchoring component and the lower anchoring component of the cable device in this solution;

[0032] Figure 4 It is a two-dimensional sectional schematic diagram of the brief implementation structure of the upper anchoring component and the lower anchoring component of the cable device in this solution;

[0033] Figure 5 It is a three-dimensional perspective schematic diagram of the brief implementation structure of the upper limiting component and the lower limiting component of the cable device in this solution;

[0034] Figure 6 It is a two-dimensional sectional schematic diagram of the brief implementation structure of the upper limiting component and the lower limiting component of the cable device in this solution;

[0035] Figure 7 It is a schematic diagram of the brief state of multiple applications of the cable device in this solution;

[0036] Figure 8 It is a geometric deformation diagram of the cable of the cable device in this solution;

[0037] Figure 9 It is a load-horizontal displacement curve diagram of the cable of the cable device in this solution;

[0038] Figure 10 It is a load-vertical displacement curve diagram of the cable of the cable device in this solution. Specific embodiments

[0039] The following will further describe the present invention in detail in conjunction with the drawings and embodiments. It should be particularly noted that the following embodiments are only used to illustrate the present invention, but do not limit the scope of the present invention. Similarly, the following embodiments are only partial embodiments of the present invention rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0040] As shown Figures 1 to 7 in one of the figures, a large-deformation multi-directional limit cable device for a bridge in the solution of this embodiment includes:

[0041] An upper anchoring assembly 1, pre-embedded in the upper structure of the bridge at the bridge support;

[0042] A lower anchoring assembly 2, pre-embedded in the lower structure of the bridge at the bridge support and opposite to the upper anchoring assembly 1;

[0043] An upper limit assembly 3, fixedly connected to the upper anchoring assembly 1;

[0044] A lower limit assembly 4, fixedly connected to the lower anchoring assembly 2 and opposite to the upper limit assembly 3;

[0045] A cable 5, one end of which penetrates upward into the upper limit assembly 3 and is fixedly connected to the upper limit assembly 3, and the other end penetrates downward into the lower limit assembly 4 and is fixedly connected to the lower limit assembly 4.

[0046] In this solution, both the upper anchoring assembly 1 and the lower anchoring assembly 2 can be pre-deployed in a pre-embedded manner during the construction of the bridge structure. As an example of a possible implementation manner of the anchoring assembly, further, the upper anchoring assembly 1 of this solution includes an upper anchoring body 11, and the upper anchoring body 11 is a cylindrical structure with one end open, and its closed end is penetrated and pre-embedded in the upper structure of the bridge at the bridge support; correspondingly, the lower anchoring assembly 2 includes a lower anchoring body 21, and the lower anchoring body 21 is a cylindrical structure with one end open, and its closed end is penetrated and pre-embedded in the lower structure of the bridge at the bridge support.

[0047] Among them, the positions and specifications of the upper anchoring body 11 and the lower anchoring body 21, the upper limit assembly 3 and the lower limit assembly 4 in this solution are corresponding relationships, and the virtual axes of the upper anchoring body 11 and the lower anchoring body 21 coincide; the upper limit assembly 3 is fixedly connected inside the cylindrical structure of the upper anchoring body 11, and the lower limit assembly 4 is fixedly connected inside the cylindrical structure of the lower anchoring body 21.

[0048] In order to improve the pre-embedding reliability of the anchoring body, as a preferred implementation option, preferably, a first square steel plate 12 with a square outer contour is connected to the outside of the open end of the upper anchoring body 11, and a first avoidance hole is provided in the middle of the first square steel plate 12 corresponding to the outer peripheral side of the upper anchoring body 11; a second square steel plate 22 with a square outer contour is connected to the outside of the open end of the lower anchoring body 21, and a second avoidance hole is provided in the middle of the second square steel plate 22 corresponding to the outer peripheral side of the lower anchoring body 21.

[0049] In this solution, the embedding depth of the device can be determined by recording the thicknesses of the first square steel plate 12 and the second square steel plate 22 and combining with the height exposed in the bridge structure. In terms of the embedding depth, as a preferred implementation option, preferably, a part of the first square steel plate 12 of this solution is embedded in the upper bridge structure at the bridge support, or the lower end surface of the first square steel plate 12 is flush with the surface of the upper bridge structure at the bridge support; a part of the second square steel plate 22 of this solution is embedded in the lower bridge structure at the bridge support, or the lower end surface of the second square steel plate 22 is flush with the surface of the lower bridge structure at the bridge support; in this solution, the first square steel plate 12 and the second square steel plate 22 can also increase the contact surface between the anchoring body and the bridge structure and improve the fastening strength of the embedding.

[0050] To ensure that the device of this solution can be well fixed to the bridge structure, in this solution, as a preferred implementation option, preferably, an anchoring steel bar 6 is provided at the end of the upper anchoring body 11 and the lower anchoring body 21 away from their open ends. In this solution, the anchoring steel bar 6 and the anchoring assembly are cast in the bridge structure with concrete, which is used to enhance the anchoring strength between the anchoring assembly of this solution and the bridge structure and prevent the function failure of the device of this solution caused by the accidental detachment of the anchoring assembly.

[0051] In terms of the connection method between the anchoring assembly and the connection assembly, as a preferred implementation option, preferably, the upper limit component 3 of this solution includes an upper limit main body 31 in a cylindrical structure, whose outer contour is adapted to the inner wall of the cylindrical structure of the upper anchoring body 11, and the upper limit main body 31 is fixedly connected to the inner wall of the cylindrical structure of the upper anchoring body 11 by screwing; in this solution, an external thread structure 311 is provided on the outer peripheral side of the upper limit main body 31, and correspondingly, an internal thread structure 111 that cooperates with it is provided on the inner wall of the cylindrical structure of the upper anchoring body 11.

[0052] In this solution, the lower limit component 4 includes a lower limit main body 41 in a cylindrical structure, whose outer contour is adapted to the inner wall of the cylindrical structure of the lower anchoring body 21, and the lower limit main body 41 is fixedly connected to the inner wall of the cylindrical structure of the lower anchoring body 21 by screwing. In this solution, an external thread structure 411 is provided on the outer peripheral side of the lower limit main body 41, and correspondingly, an internal thread structure 211 that cooperates with it is provided on the inner wall of the cylindrical structure of the lower anchoring body 21.

[0053] In this solution, the anchoring components (upper anchoring component 1 and lower anchoring component 2) and the limiting components (upper limiting component 3 and lower limiting component 4) are fixedly connected to the bridge structure through threaded connections, which ensures the integrity and stability of the entire device. In addition, the anchoring components (upper anchoring component 1 and lower anchoring component 2) and the limiting components (upper limiting component 3 and lower limiting component 4) are connected by threaded connections, which can also prevent the poured concrete from flowing out from the joint between the two, ensuring smooth removal of the limiting components (upper limiting component 3 and lower limiting component 4) and the cable 5 in the subsequent process. The cable 5 is located between the upper limiting component 3 and the lower limiting component 4, and it is the core part that bears the load in this solution.

[0054] Among them, one end of the cable 5 penetrates upward into the cylindrical structure of the upper limiting main body 31 and is fixedly connected to the upper limiting main body 31, and the other end penetrates downward into the cylindrical structure of the lower limiting main body 41 and is fixedly connected to the lower limiting main body 41.

[0055] As a preferred implementation option, preferably, a first horizontally extending portion 32 is provided on the outer peripheral side of the end of the upper limiting main body 31 close to the open end of the upper anchoring main body 11, and the first horizontally extending portion 32 is attached to the first square steel plate 12; a second horizontally extending portion 42 is provided on the outer peripheral side of the end of the lower limiting main body 41 close to the open end of the lower anchoring main body 21, and the second horizontally extending portion 42 is attached to the second square steel plate 22.

[0056] In order to facilitate the connection between the limiting main body and the anchoring main body, as a preferred implementation option, preferably, a first polygonal protrusion 33 is provided at the end of the upper limiting main body 31 close to the open end of the upper anchoring main body 11, which is used to cooperate with an external auxiliary tool to facilitate the threaded connection between the upper limiting main body 31 and the upper anchoring main body 11; a second polygonal protrusion 43 is provided at the end of the lower limiting main body 41 close to the open end of the lower anchoring main body 21, which is used to cooperate with an external auxiliary tool to facilitate the threaded connection between the lower limiting main body 41 and the lower anchoring main body 21. Among them, both the first polygonal protrusion 33 and the second polygonal protrusion 43 can be hexagonal structures.

[0057] In terms of the internal structure of the limiting main body, as a preferred implementation option, preferably, the end of the upper limiting main body 31 connected to the upper anchoring main body 11 is a closed structure, and a first stepped cavity 312 that is wider inside and narrower outside is formed inside; a second stepped cavity 412 that is wider inside and narrower outside is formed inside the lower limiting main body 41.

[0058] Among them, concrete layers 3121 and 4121 are filled in both the first stepped cavity 312 and the second stepped cavity 412 to fix the ends of the cable 5 therein.

[0059] In this solution, the first variable-diameter cavity 312 and the second variable-diameter cavity 412 can be designed as a cavity similar to a pottery pot shape, and fillet treatments are performed at the sharp corners of their inner walls to ensure the smoothness and flatness of the inner wall surface and prevent premature damage.

[0060] To facilitate the installation of the cable 5, as a preferred implementation option, preferably, an axially extending portion 23 with a cylindrical structure is provided at the end of the lower anchoring body 21 away from its open end. The inner diameter of the axially extending portion 23 is smaller than the inner diameter of the cylindrical structure of the lower anchoring body 21. Both ends of the lower limiting body 41 are open ends. After the lower limiting body 41 is threadedly connected to the lower anchoring body 21, the second variable-diameter cavity 412 communicates with the axially extending portion 23, so that the other end of the cable 5 can penetrate downward into the axially extending portion 23. To ensure that the cable 5 can be fixed smoothly and fully exert the seismic effect of the device of the present invention, the main bodies of the upper limiting assembly 3 and the lower limiting assembly 4 are located on the same central vertical line, and the circular holes at their centers are coaxial, that is, the circular holes at the centers of the anchoring assembly and the limiting assembly are continuously penetrated and have the same center line.

[0061] In this solution, the cable 5 is made of a negative Poisson's ratio material; a rubber layer is coated on the outer peripheral side of the cable 5; since the cable 5 is made of a negative Poisson's ratio material, this material has the peculiar property of "lateral expansion when stretched and lateral contraction when compressed", which is called a negative Poisson's ratio (NPR) material, also known as a "dilatational material". In terms of controlling the length dimension of the cable 5, its length can be set within the space range that can be accommodated between the upper limiting assembly 3 and the lower limiting assembly 4. The main negative Poisson's ratio (NPR) material used itself has a certain flexibility, which makes the cable 5 have a certain degree of flexibility, providing a certain degree of convenience for the installation and disassembly work of this solution at the bridge bearing where the space is already narrow. And benefiting from the peculiar properties of the special material of the cable 5 itself, coupled with the fact that the material itself also has a certain degree of hardness and strength, it can limit the displacement deformation of the bridge in all directions to a certain extent, has the ability of multi-directional limiting, and together with the shock absorption and vibration isolation effects exerted when working with the bridge bearing, the seismic performance of the overall bridge structure is more comprehensively improved.

[0062] According to relevant research, traditional cables usually use steel strands made of high-strength steel, and their typical strain rates under dynamic loads fluctuate in the range of 10 -3 / s -1 ~10 -1 / s -1 range, while the typical strain rate of the metal-based negative Poisson's ratio (NPR) material is usually in the range of 10 2 / s -1~10 3 / s -1 within, it is 10 times that of the steel strand material 3 ~10 6 times, significantly superior to the traditional steel strand material, indicating that this material has good strength and toughness, can be continuously used for a long time, ensure the sustainability of performance, help the bridge resist large deformations under earthquake effects, and better improve the seismic performance. In order to further improve the comprehensive strength and durability of the cable 5, a rubber layer is further wrapped outside the negative Poisson's ratio (NPR) material, so that the durability of the cable 5 is further improved.

[0063] In this solution, after the anchoring components (upper anchoring component 1, lower anchoring component 2) and the limiting components (upper limiting component 3, lower limiting component 4) are respectively connected to the bridge structure by threading, the fixing of the cable 5 can be started. After placing the cable 5 in the correct position, pour the evenly stirred concrete into the upper limiting component 33 and the lower limiting component 4 respectively, so that the cable 5 can be well consolidated and bound together with the upper limiting component 3 and the lower limiting component 4. After the concrete solidifies, the installation of the device in this solution is completed.

[0064] Among them, it should be noted that when pouring concrete into the upper limiting component 3, first seal the central circular hole of the upper limiting component 3, insert a conduit and pour the concrete from top to bottom. After pouring, pull out the conduit and seal the upper limiting component 3 to prevent the concrete from dripping down and flowing out. After the concrete loses fluidity, it can be unsealed and enter the normal curing process. When pouring concrete into the lower limiting component 4, in order to ensure the convenient and quick replacement of the limiting component and the cable 5, it is necessary to pay attention to sealing the circular hole at the center below the lower limiting component 4 (that is, sealing the connection between the lower limiting main body 41 and the axially extending part 23), so that the cable 5 can pass through, but prevent the concrete from flowing into the axially extending part 23 of the lower anchoring main body 21, thus interfering with the disassembly steps of the lower limiting component 4 and the cable 5.

[0065] According to the geometric deformation formula, as Figure 8 shown, the calculation methods of the horizontal and vertical forces and displacements of the NPR cable are as shown in the following formulas.

[0066] Fx = Fz * tanα (1)

[0067] ΔL = L / cosα - L (2)

[0068] F = F(ΔL) (3)

[0069] Fx = F * sinα (4)

[0070] Fz = F * cosα (5)

[0071] Wherein, Fx is the horizontal force; Fz is the vertical force; α is the inclination angle between the cable and the vertical direction under the horizontal displacement; ΔL is the cable deformation; F is the force in the cable direction when the cable deformation is ΔL, and its value is related to the deformation and the mechanical model of the cable, and can be calculated in an incremental form.

[0072] Taking 3 NPR cables with a diameter of 15.2 mm and a yield force of 420 kN as an example, the elastic modulus is 210 GPa, the tensile strength is 1000 MPa, and the cable length is 600 mm. Under the action of the horizontal load, the load-horizontal displacement curve of the cable is as Figure 9 shown, and the load-vertical displacement curve of the cable is as Figure 10 shown. The bridge installed with the device described in this patent has good energy dissipation capacity and displacement limiting capacity under large earthquakes.

[0073] The above are only some embodiments of the present invention, and thus do not limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A large-deformation multi-directional limited displacement cable device for bridges, characterized in that, It includes: An upper anchoring component, which is pre-embedded in the upper structure of the bridge at the bridge bearing; A lower anchoring component, which is pre-embedded in the lower structure of the bridge at the bridge bearing and is opposite to the upper anchoring component; An upper limiting component, which is fixedly connected to the upper anchoring component; A lower limiting component, which is fixedly connected to the lower anchoring component and is opposite to the upper limiting component; A cable, one end of which penetrates upward into the upper limiting component and is fixedly connected to the upper limiting component, and the other end penetrates downward into the lower limiting component and is fixedly connected to the lower limiting component.

2. The large-deformation multi-directional limit cable device for a bridge according to claim 1, characterized in that The upper anchoring component includes an upper anchoring body, which is a cylindrical structure with one end open, and its closed end is penetrated and pre-embedded in the upper structure of the bridge at the bridge bearing; The lower anchoring component includes a lower anchoring body, which is a cylindrical structure with one end open, and its closed end is penetrated and pre-embedded in the lower structure of the bridge at the bridge bearing; Wherein, the virtual axes of the upper anchoring body and the lower anchoring body coincide; the upper limiting component is fixedly connected inside the cylindrical structure of the upper anchoring body, and the lower limiting component is fixedly connected inside the cylindrical structure of the lower anchoring body.

3. The large-deformation multi-directional limit cable device for bridges according to claim 2, characterized in that, A first square steel plate with a square outer contour is connected to the outside of the open end of the upper anchoring body, and a first avoidance hole is provided in the middle of the first square steel plate corresponding to the outer peripheral side of the upper anchoring body; A second square steel plate with a square outer contour is connected to the outside of the open end of the lower anchoring body, and a second avoidance hole is provided in the middle of the second square steel plate corresponding to the outer peripheral side of the lower anchoring body.

4. The large-deformation multi-directional limit cable device for a bridge according to claim 3, characterized in that, The first square steel plate is partially pre-embedded in the upper structure of the bridge at the bridge bearing or the lower end surface of the first square steel plate is flush with the surface of the upper structure of the bridge at the bridge bearing; The second square steel plate is partially pre-embedded in the lower structure of the bridge at the bridge bearing or the lower end surface of the second square steel plate is flush with the surface of the lower structure of the bridge at the bridge bearing.

5. The large-deformation multi-directional limit cable device for a bridge according to claim 2, wherein An anchoring steel bar is provided at the end of both the upper anchoring body and the lower anchoring body away from their open ends; The cable is made of a negative Poisson's ratio material; a rubber layer is coated on the outer peripheral side of the cable.

6. A large-deformation multi-directional limited displacement cable device for bridges according to any one of claims 2 to 5, characterized in that, The upper limiting component includes an upper limiting main body in a cylindrical structure, whose outer contour is adapted to the inner wall of the cylindrical structure of the upper anchoring body, and the upper limiting main body is fixedly connected to the inner wall of the cylindrical structure of the upper anchoring body by threading; The lower limiting component includes a lower limiting main body in a cylindrical structure, whose outer contour is adapted to the inner wall of the cylindrical structure of the lower anchoring body, and the lower limiting main body is fixedly connected to the inner wall of the cylindrical structure of the lower anchoring body by threading; Wherein, one end of the cable penetrates upward into the cylindrical structure of the upper limiting main body and is fixedly connected to the upper limiting main body, and the other end penetrates downward into the cylindrical structure of the lower limiting main body and is fixedly connected to the lower limiting main body.

7. The large-deformation multi-directional limit cable device for a bridge according to claim 6, characterized in that, A first horizontal extension part is provided on the outer peripheral side of the end of the upper limiting main body close to the open end of the upper anchoring body, and the first horizontal extension part is in contact with the first square steel plate; A second horizontally extending portion is provided on the outer peripheral side of the end portion of the lower limit body close to the open end of the lower anchoring body, and the second horizontally extending portion is in contact with the second square steel plate.

8. The large-deformation multi-directional limit cable device for a bridge according to claim 6, characterized in that, A first polygonal convex portion is provided at the end of the upper limit body close to the open end of the upper anchoring body, which is used to cooperate with an external auxiliary tool to facilitate the threaded connection between the upper limit body and the upper anchoring body. A second polygonal convex portion is provided at the end of the lower limit body close to the open end of the lower anchoring body, which is used to cooperate with an external auxiliary tool to facilitate the threaded connection between the lower limit body and the lower anchoring body.

9. The large-deformation multi-directional limit cable device for a bridge according to claim 6, characterized in that, The end portion of the upper limit body connected to the upper anchoring body is of a closed structure, and a first stepped cavity with a larger inner diameter and a smaller outer diameter is formed inside. A second stepped cavity with a larger inner diameter and a smaller outer diameter is formed inside the lower limit body. Wherein, the first stepped cavity and the second stepped cavity are both filled with a concrete layer to fix the end portion of the cable therein.

10. The large-deformation multi-directional limit cable device for a bridge according to claim 9, characterized in that, An axially extending portion in the shape of a cylinder is provided at the end of the lower anchoring body away from its open end. The inner diameter of the axially extending portion is smaller than the inner diameter of the cylindrical structure of the lower anchoring body. Both ends of the lower limit body are open ends. After the lower limit body is threadedly connected to the lower anchoring body, the second stepped cavity communicates with the axially extending portion, so that the other end of the cable can penetrate downward into the axially extending portion.

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