A slack cable seismic isolation bearing
By adopting a relaxed cable design in the bridge bearing, the steel wire rope disperses the pressure in the arc-shaped installation cavity, increases the energy dissipation stroke, solves the problem of steel wire rope breakage caused by installation errors, and improves the shock absorption effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DATONG INC
- Filing Date
- 2025-07-04
- Publication Date
- 2026-06-26
AI Technical Summary
During earthquakes or vibrations, the steel wire ropes of existing bridge bearings are of varying lengths due to installation errors, resulting in uneven stress distribution and gradual breakage. Furthermore, their energy dissipation range is limited, making them ineffective in shock absorption.
The relaxation type cable damping bearing is adopted. The steel wire rope is distributed in a ring spiral in a relaxed state. It contacts the cavity wall through the arc surface of the mounting cavity, which disperses the pressure, allows sliding, increases the energy dissipation stroke, improves the coordination and adaptability of each coil of steel wire rope, and avoids local stress concentration.
It improves the coordination and adaptability of the wire rope and its shock absorption and energy dissipation effect, avoids the risk of breakage due to installation errors, and enhances the seismic performance of the support.
Smart Images
Figure CN224412306U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge and building seismic resistance technology, specifically to a relaxation type cable damping bearing. Background Technology
[0002] In bridge design, bearings are key components that transfer the loads from the superstructure to the substructure and accommodate the rotation and displacement of the superstructure. Bearings are categorized into pot bearings, spherical bearings, lead-core rubber bearings, and friction pendulum bearings, among others.
[0003] In practical applications, when an earthquake occurs, the horizontal displacement between the upper and lower bearing plates of ordinary rubber bearings and ball bearings cannot be effectively restrained when they encounter earthquakes or major vibration impacts, which can easily lead to beam collapse.
[0004] Current technology primarily uses steel wire ropes fixed at the upper and lower ends of the support to achieve vibration reduction and prevent beam collapse. However, the steel wire ropes are generally locked with rope clamps. After locking, the steel wire rope forms a taut, spiral shape. Each coil of the spiral is locked, limiting the energy-consuming stroke. Due to installation errors, the length of each coil of the steel wire rope may be uneven after locking. This unevenness in length will result in uneven stress when under load, with the shortest steel wire rope bearing the load first. The coils cannot automatically coordinate and adapt, leading to a risk of gradual breakage. Utility Model Content
[0005] The purpose of this utility model is to provide a relaxed cable damping support, in which the wire rope is in a relaxed state after being wound, the energy consumption stroke is increased, the coordination and adaptability of each turn of the wire rope under stress is improved, the damping and energy consumption effect is improved, and the risk of gradual breakage due to uneven lengths of each turn of the wire rope caused by installation errors is avoided.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following solution:
[0007] A relaxed cable-stayed vibration damping bearing includes an upper plate, a lower plate, and a bearing core located between the upper and lower plates. A cable, which is a steel wire rope, is provided between the upper and lower plates on the outside of the bearing core. The upper and lower plates have extension sections on their sides, and multiple mounting cavities are provided on the sides of the extension sections to allow the steel wire rope to pass through. The mounting cavities are larger at both ends and smaller in the middle, and the inner wall of the middle part of the mounting cavity is an inwardly convex arc surface. The steel wire rope passes through the mounting cavities at the upper and lower ends and is distributed in a relaxed annular spiral shape on the outside of the bearing core. The steel wire rope can slide relative to the mounting cavities.
[0008] In this design, the upper plate is typically connected to the superstructure, while the lower plate is connected to the substructure, serving to connect and transfer loads. The support core, located between the upper and lower plates, is the core load-bearing component of the support, primarily responsible for transferring vertical loads and allowing for a certain degree of horizontal displacement and rotation to accommodate structural deformation. Depending on different engineering requirements, the support core can be made of different types, such as rubber bearings or sliding bearings. Rubber bearings have good elasticity and damping performance, capable of absorbing some seismic energy; sliding bearings allow the structure to slide freely in the horizontal direction, reducing the impact of seismic forces on the structure.
[0009] In its relaxed state, the wire rope forms a loop-like spiral. During earthquakes or vibrations, energy is dissipated through the tension, bending, and friction of the wire rope, avoiding the transmission of rigid impact. The spiral structure provides graded stiffness at different deformation stages (e.g., relaxed during small deformations, tightened during large deformations), adapting to multi-frequency vibrations. The arc-shaped surface of the inner wall in the middle of the mounting cavity disperses the contact pressure between the wire rope and the cavity wall, preventing wear or breakage of the wire rope caused by localized stress concentration. The contact surface between the arc-shaped surface and the wire rope is curved, ensuring that the wire rope can slide freely during vibration, maintaining a relaxed state. The arc-shaped contact surface increases the radius of curvature of the contact area, dispersing the pressure on the wire rope over a larger area, avoiding localized compression deformation caused by sharp edges. When the wire rope bends, alternating stress is generated in the internal wires; the arc-shaped contact surface reduces the relative slippage and friction between the wires, lowering the risk of fatigue fracture.
[0010] When the support is subjected to external loads, relative displacement occurs between the upper and lower plates. Due to the loose, spiral distribution of the wire rope, the energy-dissipating stroke is longer than that of a taut wire rope. This relative displacement causes the wire rope to undergo stretching, bending, and other deformations. During deformation, the wire rope slips and rubs against the fixed plate, upper plate, and lower plate, thereby dissipating the energy input from the external load and achieving better vibration damping and energy dissipation. The spiral-wound wire rope, with each turn not locked, improves the coordination and adaptability of each turn, enhancing the vibration damping and energy dissipation effect and avoiding the risk of gradual breakage due to inconsistent lengths of the turns caused by installation errors.
[0011] Optionally, the extension section includes a mounting plate and a baffle. The mounting plate is disposed on the side of the upper plate and the side of the lower plate. The baffle includes a first baffle and a second baffle. The first baffle is connected to the lower part of the upper mounting plate by a plurality of first bolts, and the second baffle is connected to the upper part of the lower mounting plate by a plurality of bolts. Two adjacent first bolts and the mounting plate and the first baffle form a first mounting cavity that is large at both ends and small in the middle. Two adjacent second bolts and the mounting plate and the second baffle form a second mounting cavity that is large at both ends and small in the middle. The wire rope passes through the first mounting cavity and the second mounting cavity and is distributed in a loose annular spiral shape on the outside of the support core.
[0012] Optionally, the opposing sidewalls of two adjacent first bolts form the arc-shaped surface of the first mounting cavity, and the opposing sidewalls of two adjacent second bolts form the arc-shaped surface of the second mounting cavity.
[0013] Optionally, the wire rope is tangent to the arc-shaped surfaces on both sides when passing through the first mounting cavity, and tangent to the arc-shaped surfaces on both sides when passing through the second mounting cavity.
[0014] Optionally, the first bolts are distributed in a ring at intervals on the outside of the support core, and the second bolts are distributed in a ring at intervals on the outside of the support core.
[0015] Optionally, the distance between the two first bolts constituting the first mounting cavity is greater than the diameter of the wire rope, and the distance between the two second bolts constituting the second mounting cavity is greater than the diameter of the wire rope.
[0016] Optionally, the wire rope is provided with a limiting member at its end. The size of the limiting member is larger than the size of the first mounting cavity and the second mounting cavity. The wire rope is an integral annular spiral or a multi-segment spiral.
[0017] Optionally, the support core can be any one of a rubber support, a spherical support, a friction pendulum support, or a vibration damping and isolation support.
[0018] The beneficial effects of this utility model are:
[0019] 1. The arc-shaped surface of the inner wall of the mounting cavity disperses the contact pressure between the wire rope and the cavity wall, preventing wear or breakage of the wire rope caused by localized stress concentration. The contact surface between the arc-shaped surface and the wire rope is curved, ensuring that the wire rope can slide freely during vibration and maintain a relaxed state. The arc-shaped contact surface increases the radius of curvature of the contact area, distributing the pressure on the wire rope over a larger area and avoiding localized compression deformation caused by sharp edges. When the wire rope bends, alternating stress is generated in the internal wires. The arc-shaped contact surface can reduce the relative slippage and friction between the wires, reducing the risk of fatigue fracture.
[0020] 2. In this invention, when the support is subjected to an external load, a relative displacement occurs between the upper and lower plates. Because the wire rope is distributed in a loose, spiral shape, its energy-dissipating stroke is longer than that of a taut wire rope. This relative displacement causes the wire rope to undergo stretching, bending, and other deformations. During deformation, the wire rope slips and rubs against the fixed plate, upper plate, and lower plate, thereby dissipating the energy input from the external load and achieving better vibration damping and energy dissipation. The spirally wound wire rope, with each turn not locked, improves the coordination and adaptability of each turn, enhancing the vibration damping and energy dissipation effect and avoiding the risk of gradual breakage due to inconsistent lengths of the turns caused by installation errors. Attached Figure Description
[0021] Figure 1This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure without steel wire ropes installed.
[0023] Figure 3 This is a top view of the first mounting cavity.
[0024] Figure 4 Structural diagram showing the installation of a single steel wire rope;
[0025] Figure 5 This is a schematic diagram of the structure when multiple steel wire ropes are laid.
[0026] Reference numerals: 1-Support core, 2-Upper plate, 3-Lower plate, 4-Wire rope, 5-First baffle, 6-Second baffle, 7-First bolt, 8-Second bolt, 9-First mounting cavity, 10-Second mounting cavity, 11-Limiting component, 12-Mounting plate. Detailed Implementation
[0027] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.
[0028] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example
[0030] like Figure 1 and Figure 2As shown, a relaxed cable damping bearing includes an upper plate 2, a lower plate 3, and a bearing core 1 located between the upper plate 2 and the lower plate 3. A cable, which is a steel wire rope 4, is provided between the upper plate 2 and the lower plate 3 on the outside of the bearing core 1. The upper plate 2 and the lower plate 3 have extension sections on their sides, and multiple mounting cavities are opened on the sides of the extension sections to allow the steel wire rope 4 to pass through. The mounting cavities are larger at both ends and smaller in the middle, and the inner wall of the middle part of the mounting cavity is an inwardly convex arc surface. The steel wire rope 4 passes through the mounting cavities at the upper and lower ends and is distributed in a relaxed annular spiral shape on the outside of the bearing core 1. The steel wire rope 4 can slide relative to the mounting cavities.
[0031] In this embodiment, the upper plate 2 is typically connected to the superstructure (beam), while the lower plate 3 is connected to the substructure (pier), serving to connect and transfer loads. The support core 1, located between the upper plate 2 and the lower plate 3, is the core load-bearing component of the support, primarily responsible for transmitting vertical loads and allowing for a certain degree of horizontal displacement and rotation to accommodate structural deformation. Depending on different engineering requirements, the support core 1 can be of different types, such as rubber bearings or sliding bearings. Rubber bearings have good elasticity and damping performance, capable of absorbing some seismic energy; sliding bearings allow the structure to slide freely in the horizontal direction, reducing the impact of seismic forces on the structure.
[0032] In its relaxed state, the steel wire rope 4 forms a loop-like spiral. During earthquakes or vibrations, energy is dissipated through the tension, bending, and friction of the steel wire rope 4, avoiding the transmission of rigid impact. The spiral structure provides graded stiffness at different deformation stages (e.g., relaxed during small deformations, tightened during large deformations), adapting to multi-frequency vibrations. The arc-shaped surface of the inner wall in the middle of the mounting cavity disperses the contact pressure between the steel wire rope 4 and the cavity wall, avoiding wear or breakage of the steel wire rope 4 caused by local stress concentration. The contact surface between the arc-shaped surface and the steel wire rope 4 is curved, ensuring that the steel wire rope 4 can slide freely during vibration, maintaining a relaxed state. The arc-shaped contact surface increases the radius of curvature of the contact area, dispersing the pressure on the steel wire rope 4 over a larger area, avoiding local compression deformation caused by sharp edges. When the steel wire rope 4 bends, the internal steel wires generate alternating stress; the arc-shaped contact surface reduces the relative slippage and friction between the steel wires, lowering the risk of fatigue fracture.
[0033] When the support is subjected to external loads, relative displacement occurs between the upper plate 2 and the lower plate 3. Because the wire rope 4 is distributed in a loose, spiral shape, its energy-dissipating stroke is longer than that of a taut wire rope 4. This relative displacement causes the wire rope 4 to undergo stretching, bending, and other deformations. During deformation, the wire rope 4 slips and rubs against the fixed plate, upper plate 2, and lower plate 3, thereby dissipating the energy input from the external load and achieving better vibration damping and energy dissipation. The spirally wound wire rope 4, with each turn not locked, improves the coordination and adaptability of each turn, enhancing the vibration damping and energy dissipation effect and avoiding the risk of gradual breakage due to inconsistent lengths of the turns caused by installation errors.
[0034] like Figure 3 As shown, the extension section further includes a mounting plate 12 and a baffle. The mounting plate 12 is disposed on the side of the upper plate 2 and the side of the lower plate 3. The baffle includes a first baffle 5 and a second baffle 6. The first baffle 5 is connected to the lower part of the upper mounting plate 12 by a plurality of first bolts 7. The second baffle 6 is connected to the upper part of the lower mounting plate 12 by a plurality of bolts. Two adjacent first bolts 7 and the mounting plate 12 and the first baffle 5 form a first mounting cavity 9 that is large at both ends and small in the middle. Two adjacent second bolts 8 and the mounting plate 12 and the second baffle 6 form a second mounting cavity 10 that is large at both ends and small in the middle. The wire rope 4 passes through the first mounting cavity 9 and the second mounting cavity 10 and is distributed in a loose annular spiral shape on the outside of the support core 1.
[0035] Specifically, to better protect the wire rope 4 and avoid the risk of compression deformation or even breakage of the wire rope 4 strands due to prolonged contact with the edges and corners of the first baffle 5 and the second baffle 6 during bending and winding, the outer and inner edges of the first baffle 5 and the second baffle 6 are rounded. Both the first baffle 5 and the second baffle 6 are annular plates, and the mounting plate 12 is also annular. The mounting plate 12 is integrally formed or welded with the upper plate 2 and the lower plate 3. The first baffle 5 and the second baffle 6 are distributed between the upper plate 2 and the lower plate 3. Under the action of the first bolt 7 and the second bolt 8, the first… The baffle 5 is suspended below the upper plate 2 and spaced apart from the bottom surface of the upper plate 2. The second baffle 6 is suspended above the lower plate 3 and spaced apart from the top surface of the lower plate 3. The mounting cavity includes a first mounting cavity 9 and a second mounting cavity 10. The first mounting cavity 9 is formed by two adjacent first bolts 7, the first baffle 5, and the upper mounting plate 12. The second mounting cavity 10 is formed by two adjacent second bolts 8, the second baffle 6, and the lower mounting plate 12. When the wire rope 4 is threaded, it can be threaded from the first mounting cavity 9 first or from the second mounting cavity 10 first, without any order.
[0036] The first baffle 5 and the second baffle 6 can be a single, integral ring, or they can be designed as four curved plates, significantly reducing manufacturing difficulty. Compared to manufacturing a single large, circular fixing plate, manufacturing four curved plates is simpler in terms of process, improving production efficiency and reducing manufacturing costs. During installation, the four curved plates can be installed separately, making operation more flexible and convenient, especially in situations with limited space. This modular design makes it easier to install the fixing plate in the designated position.
[0037] During transportation, the four curved plates can be stacked or packaged separately, reducing transportation volume and costs. When the support needs maintenance or component replacement, only the problematic curved plate needs to be operated on, without disassembling the entire fixed plate, thus improving the convenience and efficiency of maintenance.
[0038] Furthermore, the opposing sidewalls of two adjacent first bolts 7 form the arc-shaped surface of the first mounting cavity 9, and the opposing sidewalls of two adjacent second bolts 8 form the arc-shaped surface of the second mounting cavity 10.
[0039] Furthermore, when the wire rope 4 passes through the first mounting cavity 9, it is tangent to the arc-shaped surfaces on both sides, and when it passes through the second mounting cavity 10, it is tangent to the arc-shaped surfaces on both sides.
[0040] Furthermore, the first bolt 7 is evenly spaced in a ring on the outside of the support core 1, and the second bolt 8 is evenly spaced in a ring on the outside of the support core 1.
[0041] Furthermore, the distance between the two first bolts 7 constituting the first mounting cavity 9 is greater than the diameter of the wire rope 4, and the distance between the two second bolts 8 constituting the second mounting cavity 10 is greater than the diameter of the wire rope 4.
[0042] Specifically, in order to ensure that the wire rope 4 slides in the first mounting cavity 9 and the second mounting cavity 10, the distance between the two first bolts 7 is greater than the diameter of the wire rope 4, the distance between the two second bolts 8 is greater than the diameter of the wire rope 4, and the wire rope 4 passes obliquely through the first mounting cavity 9 and the second mounting cavity 10 and is tangent to the arc surface.
[0043] Furthermore, the end of the wire rope 4 is provided with a limiting member 11, the size of which is larger than the size of the first mounting cavity 9 and the second mounting cavity 10. The wire rope 4 is an integral annular spiral or a multi-segment spiral.
[0044] Specifically, after the wire rope 4 is threaded through, limiting components 11 are installed at both ends of the wire rope 4. The limiting components 11 are existing nuts or clips. Neither the nuts nor the clips can pass through the first mounting cavity 9 and the second mounting cavity 10, thus ensuring that the wire rope 4 will not detach from the support. The connection method between the nuts and clips and the wire rope 4 is existing technology. The clips can be U-shaped, and the limiting components 11 can be installed at both ends of the wire rope 4, or the wire rope 4 can share a single limiting component 11.
[0045] like Figure 4 As shown, the integral annular spiral is a continuous steel wire rope 4, which forms a complete loop through winding. A single steel wire rope 4 can be repeatedly wound to form multiple loops. One end of the steel wire rope 4 passes directly through the first mounting cavity 9 and the second mounting cavity 10 in a relaxed annular spiral shape distributed on the outside of the support body. The installation process of the integral annular steel wire rope 4 is simpler, eliminating the need for connecting multiple sections of the steel wire rope 4, reducing installation steps and time, and improving construction efficiency. Because the steel wire rope 4 is integral, its mechanical properties are relatively uniform throughout, and during stress deformation, the vibration damping and energy dissipation characteristics of each part are also more consistent, enabling it to reliably perform its vibration damping function.
[0046] like Figure 5 As shown, the multi-segment spiral is composed of multiple shorter steel wire ropes 4. Each steel wire rope 4 passes through the first mounting cavity 9 and the second mounting cavity 10 in sequence and is distributed on the outside of the support body, forming multiple arc-shaped spirals. The multiple arc-shaped segments form a ring.
[0047] The shorter length of the multi-segment wire rope 4 facilitates transportation and storage, saving on transportation costs and storage space. It also allows for more flexible handling and operation on the construction site. When a segment of the wire rope 4 is damaged, only the damaged segment needs to be replaced, rather than the entire wire rope 4, reducing replacement costs and maintenance complexity.
[0048] Furthermore, the support core 1 can be any one of a rubber support, a spherical support, a friction pendulum support, or a vibration damping and isolation support.
[0049] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.
Claims
1. A relaxation-type cable damping bearing, comprising an upper plate (2), a lower plate (3), and a bearing core (1) located between the upper plate (2) and the lower plate (3), wherein a cable is provided between the upper plate (2) and the lower plate (3) on the outside of the bearing core (1), the cable being a steel wire rope (4), characterized in that, The upper plate (2) and lower plate (3) are provided with extension sections on their sides. Multiple installation cavities are provided on the sides of the extension sections to allow steel wire ropes (4) to pass through. The installation cavities are large at both ends and small in the middle. The inner wall of the middle part of the installation cavity is an arc-shaped surface that bulges inward. The steel wire ropes (4) pass through the installation cavities at the upper and lower ends and are distributed in a loose annular spiral shape on the outside of the support core (1). The steel wire ropes (4) can slide relative to the installation cavities.
2. The relaxation-type cable damping bearing according to claim 1, characterized in that, The extension section includes a mounting plate (12) and a baffle. The mounting plate (12) is located on the side of the upper plate (2) and the side of the lower plate (3). The baffle includes a first baffle (5) and a second baffle (6). The first baffle (5) is connected to the lower part of the upper mounting plate (12) by multiple first bolts (7). The second baffle (6) is connected to the upper part of the lower mounting plate (12) by multiple bolts. Two adjacent first bolts (7) form a first mounting cavity (9) between the mounting plate (12) and the first baffle (5), which is large at both ends and small in the middle. Two adjacent second bolts (8) form a second mounting cavity (10) between the mounting plate (12) and the second baffle (6), which is large at both ends and small in the middle. The wire rope (4) passes through the first mounting cavity (9) and the second mounting cavity (10) and is distributed in a loose annular spiral shape on the outside of the support core (1).
3. A relaxation-type cable damping bearing according to claim 2, characterized in that, The opposing sidewalls of two adjacent first bolts (7) form the arc surface of the first mounting cavity (9), and the opposing sidewalls of two adjacent second bolts (8) form the arc surface of the second mounting cavity (10).
4. A relaxation-type cable damping bearing according to claim 3, characterized in that, When the wire rope (4) passes through the first mounting cavity (9), it is tangent to the arc surfaces on both sides, and when it passes through the second mounting cavity (10), it is tangent to the arc surfaces on both sides.
5. A relaxation-type cable damping bearing according to claim 2, characterized in that, The first bolt (7) is distributed in a ring at intervals on the outside of the support core (1), and the second bolt (8) is distributed in a ring at intervals on the outside of the support core (1).
6. A relaxation-type cable damping bearing according to claim 2, characterized in that, The distance between the two first bolts (7) constituting the first mounting cavity (9) is greater than the diameter of the wire rope (4), and the distance between the two second bolts (8) constituting the second mounting cavity (10) is greater than the diameter of the wire rope (4).
7. A relaxation-type cable damping bearing according to claim 2, characterized in that, The wire rope (4) is provided with a limiting member (11) at its end. The size of the limiting member (11) is larger than the size of the first mounting cavity (9) and the second mounting cavity (10). The wire rope (4) is an integral annular spiral or a multi-segment spiral.
8. A relaxation-type cable damping bearing according to claim 1, characterized in that, The bearing core (1) can be any one of rubber bearing, spherical bearing, friction pendulum bearing, or vibration damping bearing.