A bearing for bridge seismic isolation

Abstract

The present invention provides a support for bridge seismic reduction and isolation, including an upper seat plate, an energy absorption component, a lower seat plate and at least one group of elastic components, the lower seat plate is provided with a cavity, the lower end of the upper seat plate is provided with a number of accommodating cavities equal to the number of elastic components, the elastic components are arranged in each accommodating cavity in a one-to-one correspondence, the upper seat plate can be slidably arranged on the bottom surface of the cavity through the elastic component, the energy absorption component is arranged in the cavity and is located between the lower end of the upper seat plate and the inner wall of the cavity. The technical solution of the present invention is applied, and the effect is: the energy of the earthquake can be consumed by deformation, the effect of seismic reduction and isolation can be achieved, and the bridge can be prevented from being damaged; the requirements of translational displacement and rotational displacement during daily use can be met.

Description

Technical Field

[0001] The invention relates to the technical field of bridge bearings, and in particular to a bearing used for bridge seismic reduction and isolation. Background Art

[0002] Earthquakes are sudden natural disasters. In order to prevent earthquakes from causing huge losses to people's lives and property, at present, engineering structures often take seismic reduction and isolation measures to reduce the losses caused by earthquakes to engineering structures.

[0003] Similar seismic isolation bearings currently used in bridges have the following problems:

[0004] 1. Under normal use, the structural defects of the bearing itself will cause the beam to rise and the road surface to bulge, affecting driving comfort and safety. Specifically, when the bearing changes in temperature and moves during operation, it will cause the beam to rise or fall continuously, affecting driving comfort and safety.

[0005] 2. The friction coefficient is unstable, which affects the seismic isolation effect. The existing slide plate of the seismic isolation bearing uses the slide plate material of the conventional bearing. The slide plate material needs to be lubricated with silicone grease. After applying silicone grease, it has a lower friction coefficient, which is beneficial to the temperature expansion and contraction of the bridge, but greatly affects the friction energy dissipation during earthquakes.

[0006] 3. The conventional seismic isolation bearing limit structure conflicts with the rotation structure. The purpose of the limit structure is to ensure that the bearing plays a restraining role during normal operation and is sheared off during an earthquake; the purpose of the rotation structure is to release the rotation deformation of the bridge. Since the limit structure requires no gap between the bearing components, and the rotation requires a certain gap to meet the rotation angle, there is a structural conflict between the two.

[0007] In summary, there is an urgent need for a bearing for bridge seismic reduction and isolation to solve the problems existing in the prior art. Summary of the invention

[0008] The purpose of the present invention is to provide a bearing for bridge seismic isolation, and the specific technical solution is as follows:

[0009] A bearing for bridge seismic reduction and isolation, comprising an upper seat plate, an energy absorbing component, a lower seat plate and at least one group of elastic components, wherein the lower seat plate is provided with a cavity, the lower end of the upper seat plate is provided with accommodating cavities equal in number to the elastic components, the elastic components are arranged in each accommodating cavity in a one-to-one correspondence, the upper seat plate can be slidably arranged on the bottom surface of the cavity through the elastic component, and the energy absorbing component is arranged in the cavity and is located between the lower end of the upper seat plate and the inner side wall of the cavity.

[0010] Preferably in the above technical solution, the energy absorption assembly includes an inner limiting ring and at least three leaf springs, the lower end of the upper seat plate is arranged in the inner limiting ring, the multiple leaf springs are evenly arranged along the outer circumference of the inner limiting ring, and the single leaf spring connects the inner wall of the cavity and the outer wall of the inner limiting ring.

[0011] Preferably in the above technical scheme, the energy absorption assembly includes an inner limit ring, an outer limit ring, at least three damping members and at least three leaf springs, the lower end of the upper seat plate is arranged in the inner limit ring, the outer limit ring and the inner limit ring are arranged coaxially, the leaf spring is an arched structure and is located between the outer limit ring and the inner limit ring, both ends of the single leaf spring in the length direction are rotatably connected to the inner side wall of the outer limit ring, the arch apex of the leaf spring is fixedly connected to the outer side wall of the inner limit ring, the multiple damping members are evenly arranged along the outer circumference of the outer limit ring, and the two ends of the damping member are rotatably connected to the inner side wall of the cavity and the outer side wall of the outer limit ring respectively.

[0012] Preferably in the above technical solution, the damping member is in an arc-shaped structure, and a plurality of the damping members are evenly arranged in a clockwise or counterclockwise direction.

[0013] Preferably, the above technical solution also includes a hinge seat, and hinge seats are provided on the inner wall of the cavity, the outer wall of the outer limit ring and the inner wall of the outer limit ring, and both ends of the damping member and the two ends of the leaf spring are rotatably connected through the hinge seat.

[0014] Preferably in the above technical solution, the lower end of the upper seat plate is a cylindrical structure, and the inner diameter of the inner limit ring is greater than or equal to the outer diameter of the cylindrical structure.

[0015] Preferably in the above technical scheme, the elastic component includes a spring, a sliding ball seat and a sliding ball, the spring is vertically arranged and its two ends are respectively connected to the inner wall of the accommodating cavity and the upper end of the sliding ball seat, the lower end of the sliding ball seat is provided with a sliding ball cavity for installing the sliding ball, the sliding ball is movably embedded in the sliding ball cavity, the elastic component is installed in the accommodating cavity, and the upper seat plate can be slidably set on the bottom surface of the cavity through the contact between the sliding ball and the bottom surface of the cavity.

[0016] Preferably in the above technical solution, the number of the elastic components is at least three groups, and the multiple groups of elastic components are evenly arranged at the lower end of the upper seat plate, and the rotation of the upper seat plate around the horizontal direction is achieved through the different compression amounts of each group of elastic components.

[0017] Preferably in the above technical solution, the cavity is cylindrical, and the bottom surface of the cavity includes a plane and a spherical surface, the plane is located at the center of the bottom surface, and the spherical surface is located around the plane.

[0018] Preferably in the above technical solution, the inner limit ring, the outer limit ring and the cavity are arranged coaxially.

[0019] The application of the technical solution of the present invention has the following beneficial effects:

[0020] (1) The support for bridge seismic reduction and isolation of the present invention includes an energy absorbing component, which includes an inner limit ring, an outer limit ring, a leaf spring and a damping element. The inner limit ring can be used to limit the sliding displacement of the upper seat plate, thereby meeting the deformation and displacement requirements of the beam body during daily use. At the same time, the inner limit ring can prevent the upper seat plate from displacing too much and causing the beam to fall. In the event of an earthquake, the deformation of the leaf spring and the damping element can meet the further displacement requirements of the upper seat plate. At the same time, the deformation can consume the energy of the earthquake, thereby achieving the effect of seismic reduction and isolation and preventing the bridge from being damaged. In the event of an earthquake, as the displacement increases, the energy absorbing component is compressed more and the energy absorbing effect is greater.

[0021] (2) The bearing for bridge seismic isolation of the present invention has an inner diameter of the inner limit ring that is greater than or equal to the outer diameter of the cylindrical structure. When the inner diameter of the inner limit ring is greater than the outer diameter of the cylindrical structure, the bearing for bridge seismic isolation of the present invention is a movable bearing; when the inner diameter of the inner limit ring is equal to the outer diameter of the cylindrical structure, the bearing for bridge seismic isolation of the present invention is a fixed bearing. A suitable fixed bearing or movable bearing can be selected according to actual usage requirements to meet daily use requirements.

[0022] (3) The bearing for bridge seismic reduction of the present invention includes an elastic component, and the elastic component includes a spring, a sliding ball seat and a sliding ball. The sliding ball contacts the bottom surface of the cavity to realize that the upper seat plate can be slidably set on the bottom surface of the cavity, which satisfies the translational displacement of the upper seat plate on the bottom surface of the cavity. The sliding ball has a small friction resistance, which can effectively prevent the bearing from being blocked during use. At the same time, the number of elastic components is at least three groups, and the upper seat plate can be rotated around the horizontal direction by the different compression amounts of each group of elastic components, thereby satisfying the rotation of the beam body during daily use. The combination of the elastic component and the energy absorption component can make it easier to reset the upper seat plate, and can also achieve better energy absorption effect when the displacement increases. At the same time, the rotation is realized by the different compression amounts of each group of elastic components, and the inner limit ring and the outer limit ring are used to realize the limit. The two will not affect each other in function, and there is no conflict in structure.

[0023] (4) The present invention is used for the bearing of bridge seismic isolation, and the cavity is composed of a plane and a spherical surface. The spherical surface is located around the plane. The plane can meet the displacement requirements of the upper seat plate in daily use, and the spherical surface can realize the use of gravitational potential energy to do work to dissipate energy and reset after the earthquake, thereby achieving better seismic isolation.

[0024] (5) The bearing used for bridge seismic isolation of the present invention can meet the thermal expansion and contraction requirements of the bridge and the translational and rotational displacements when the bearing slides freely on the plane through the combination of the plane and the sliding ball, and basically does not cause the phenomenon of beam lifting. The combination of the spherical surface and the sliding ball utilizes the gravitational potential energy to do work to consume the seismic energy, thus overcoming the problems existing in the prior art.

[0025] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 is an exploded view of the support of the present invention;

[0028] Figure 2 Schematic diagram of the structure of the support of the present invention (top view and upper seat plate not shown);

[0029] Figure 3 Schematic diagram of the structure of the support of the present invention (looking up and the lower seat plate and elastic components are not shown);

[0030] Figure 4 It is a schematic diagram of the structure of the elastic component in the present invention;

[0031] Figure 5 It is a structural schematic diagram of the damping member in the present invention;

[0032] Figure 6 is a cross-sectional view of the lower seat plate of the present invention;

[0033] Figure 7 is a front view of the support of the present invention;

[0034] Among them, 1. upper seat plate, 2. elastic component, 2.1. spring, 2.2. sliding ball seat, 2.3. sliding ball, 3. inner limit ring, 4. leaf spring, 5. outer limit ring, 6. damping element, 7. lower seat plate, 7.1. plane, 7.2. spherical surface, 8. hinged seat. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0036] Embodiment 1:

[0037] See also Figures 1 to 7, a bearing for bridge seismic isolation, specifically a seismic isolation bearing with a limiting ring used on bridges, comprising an upper seat plate 1, an energy absorbing component, a lower seat plate 7 and at least one group of elastic components 2, the lower seat plate 7 is provided with a cavity, the lower end of the upper seat plate 1 is provided with a number of accommodating cavities equal to the number of elastic components 2, the elastic components 2 are arranged in each accommodating cavity in a one-to-one correspondence, the upper seat plate 1 can be slidably arranged on the bottom surface of the cavity through the elastic component 2, the energy absorbing component is arranged in the cavity and is located between the lower end of the upper seat plate 1 and the inner side wall of the cavity.

[0038] During actual use, the upper seat plate is connected to the bottom surface of the beam body to support the beam body, and the lower seat plate is connected to the cap beam or the support pad stone to support the beam body through the support.

[0039] The energy absorption assembly includes an inner limit ring 3, an outer limit ring 5, at least three damping members 6 and at least three leaf springs 4. The lower end of the upper seat plate 1 is arranged in the inner limit ring 3, and the outer limit ring 5 is arranged coaxially with the inner limit ring 3. The leaf spring 4 is an arched structure and is located between the outer limit ring 5 and the inner limit ring 3. Multiple leaf springs 4 are evenly arranged between the outer limit ring and the inner limit ring. Both ends of the single leaf spring 4 in the length direction are rotatably connected to the inner side wall of the outer limit ring 5, and the arch apex of the leaf spring 4 is fixedly connected to the outer side wall of the inner limit ring 3 (preferably welded). Multiple damping members 6 are evenly arranged along the outer circumference of the outer limit ring 5, and both ends of the damping member 6 are rotatably connected to the inner side wall of the cavity and the outer side wall of the outer limit ring 5 respectively.

[0040] Preferably, the leaf spring is a leaf spring in the prior art, and the damping element is a steel damper.

[0041] The damping member 6 is an arc-shaped structure, and a plurality of damping members 6 are evenly arranged clockwise or counterclockwise between the inner side wall and the outer limit ring 5. Preferably, see Figure 2 The connection point between the damping member 6 and the inner wall and the connection point between the damping member 6 and the outer limiting ring 5 are staggered.

[0042] Preferably, the lower end of the upper seat plate 1 is a cylindrical structure, and the inner diameter of the inner limit ring 3 is greater than or equal to the outer diameter of the cylindrical structure.

[0043] When the inner diameter of the inner limit ring is larger than the outer diameter of the cylindrical structure, the bearing used for bridge seismic reduction of the present invention is a movable bearing, that is, the upper seat plate can move freely in the inner limit ring within the allowed range, so as to meet the daily deformation and displacement requirements of the bridge; when the inner diameter of the inner limit ring is equal to the outer diameter of the cylindrical structure, the bearing used for bridge seismic reduction of the present invention is a fixed bearing, that is, the upper seat plate cannot move freely in the inner limit ring, and the fixed bearing will cause the upper seat plate to move only when the bridge is subjected to a large external force (such as an earthquake). At this time, the damping member and the leaf spring will be deformed, thereby meeting the displacement requirements of the upper seat plate and realizing energy dissipation of external forces, thereby protecting the bridge from damage.

[0044] The support for bridge seismic isolation also includes an articulated seat 8. The inner wall of the cavity, the outer wall of the outer limit ring 5 and the inner wall of the outer limit ring 5 are all provided with an articulated seat 8. Both ends of the damping member 6 and both ends of the leaf spring 4 are rotatably connected through the articulated seat 8. Figure 2 and Figure 5 .

[0045] The elastic component 2 includes a spring 2.1, a sliding ball seat 2.2 and a sliding ball 2.3. The spring 2.1 is vertically arranged and its two ends are respectively connected to the inner wall of the accommodating cavity and the upper end of the sliding ball seat 2.2. The lower end of the sliding ball seat 2.2 is provided with a sliding ball cavity for installing the sliding ball 2.3. The sliding ball 2.3 is movably embedded in the sliding ball cavity. The elastic component 2 is installed in the accommodating cavity. The sliding ball 2.3 contacts the bottom surface of the cavity so that the upper seat plate 1 can be slidably arranged on the bottom surface of the cavity.

[0046] The number of the elastic components 2 is at least three, and the multiple groups of elastic components 2 are evenly arranged at the lower end of the upper seat plate 1. The upper seat plate 1 can be rotated around the horizontal direction (that is, the vertically arranged upper seat plate swings vertically with the sliding ball as the fulcrum) through the different compression amounts of each group of elastic components 2.

[0047] When at least three sets of elastic components are provided, the rotation requirements of the upper seat plate, the sliding of the upper seat plate and the vertical vibration reduction and isolation can be met. When there is only one set of elastic components, only the sliding and vertical vibration reduction and isolation of the upper seat plate can be achieved. Regardless of the number of elastic components, it should be ensured that after the upper seat plate supports the beam body, the upper seat plate will not contact the lower seat plate. Therefore, it is necessary to consider the pressure that the spring can withstand when designing and selecting the model and number of springs.

[0048] See also Figure 7 The cavity is cylindrical, and the bottom surface of the cavity includes a plane 7.1 and a spherical surface 7.2. The plane is located at the center of the bottom surface, and the spherical surface is located around the plane.

[0049] Preferably, the inner limiting ring 3, the outer limiting ring 5 and the cavity are arranged coaxially.

[0050] The working principle of the bearing used for bridge seismic isolation of the present invention is:

[0051] During normal use, the upper seat plate moves on the plane of the cavity in the lower seat plate, and the rolling of the sliding ball on the plane can achieve translational displacement, while the rotational displacement can be achieved through the compression changes between different springs, that is, the rotation requirements of the beam body and the displacement requirements of the daily use of the bridge can be met; this bearing can ensure that no beam lifting phenomenon will occur during the translational displacement process, and in the rotational displacement, theoretically, beam lifting phenomenon will definitely occur, but because the rotation angle is very small, the beam lifting phenomenon caused is not obvious. Therefore, the bearing for bridge seismic reduction and isolation of the present invention can basically solve the problem of beam lifting occurring in daily use of bridges.

[0052] In the event of an earthquake, the displacement becomes larger and the upper seat plate moves to the spherical surface of the lower seat plate. At this time, the lower end of the upper seat plate contacts the inner limit ring, and the leaf spring and damping element begin to play a role. In the event of an earthquake, this support can use gravity to do work to dissipate seismic energy, and can also use damping elements to absorb seismic energy. After the earthquake, under the action of its own weight, the beam body can make the sliding ball roll back from the spherical surface to the plane of the lower seat plate, thereby realizing the automatic reset function.

[0053] Embodiment 2:

[0054] The only difference between this embodiment and Embodiment 1 is that the energy absorption assembly includes an inner limit ring 3 and at least three leaf springs 4, multiple leaf springs 4 are evenly arranged along the outer circumference of the inner limit ring 3, a single leaf spring 4 connects the inner wall of the cavity and the outer wall of the inner limit ring 3, and the lower end of the upper seat plate 1 is arranged in the inner limit ring 3.

[0055] Preferably, the leaf spring is hinged to the inner wall of the cavity and fixedly connected to the inner limit ring, ie, welded.

[0056] In actual use, the energy absorption component may only have an inner limit ring and a leaf spring for energy dissipation, that is, the method of this embodiment, or an inner limit ring, an outer limit ring, a leaf spring and a damping member may be provided for energy dissipation, that is, the method of embodiment 1. The specific setting method should be selected according to actual needs.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bearing for bridge seismic isolation, characterized in that: The invention comprises an upper seat plate (1), an energy absorbing component, a lower seat plate (7) and at least one group of elastic components (2); the lower seat plate (7) is provided with a cavity; the lower end of the upper seat plate (1) is provided with a number of accommodating cavities equal to the number of the elastic components (2); the elastic components (2) are arranged in each accommodating cavity in a one-to-one correspondence; the upper seat plate (1) can be slidably arranged on the bottom surface of the cavity through the elastic components (2); the energy absorbing component is arranged in the cavity and is located between the lower end of the upper seat plate (1) and the inner wall of the cavity; The lower end of the upper seat plate (1) is a cylindrical structure; The elastic component (2) comprises a spring (2.1), a sliding ball seat (2.2) and a sliding ball (2.3); the spring (2.1) is vertically arranged and its two ends are respectively connected to the inner wall of the accommodating cavity and the upper end of the sliding ball seat (2.2); the lower end of the sliding ball seat (2.2) is provided with a sliding ball cavity for installing the sliding ball (2.3); the sliding ball (2.3) is movably embedded in the sliding ball cavity; the elastic component (2) is installed in the accommodating cavity; and the upper seat plate (1) can be slidably arranged on the bottom surface of the cavity by the sliding ball (2.3) contacting the bottom surface of the cavity.

2. The bearing for bridge seismic isolation according to claim 1, characterized in that: The energy absorption component comprises an inner limiting ring (3) and at least three leaf springs (4); the lower end of the upper seat plate (1) is arranged in the inner limiting ring (3); a plurality of leaf springs (4) are evenly arranged along the outer circumference of the inner limiting ring (3); and a single leaf spring (4) connects the inner wall of the cavity and the outer wall of the inner limiting ring (3).

3. The bearing for bridge seismic isolation according to claim 1, characterized in that: The energy absorption component comprises an inner limiting ring (3), an outer limiting ring (5), at least three damping members (6) and at least three leaf springs (4); the lower end of the upper seat plate (1) is arranged in the inner limiting ring (3); the outer limiting ring (5) and the inner limiting ring (3) are arranged coaxially; the leaf spring (4) is an arched structure and is located between the outer limiting ring (5) and the inner limiting ring (3); both ends of the leaf spring (4) in the length direction are rotatably connected to the inner side wall of the outer limiting ring (5); the arched apex of the leaf spring (4) is fixedly connected to the outer side wall of the inner limiting ring (3); the plurality of damping members (6) are evenly arranged along the outer periphery of the outer limiting ring (5); and the two ends of the damping member (6) are rotatably connected to the inner side wall of the cavity and the outer side wall of the outer limiting ring (5), respectively.

4. The bearing for bridge seismic isolation according to claim 3, characterized in that: The damping member (6) is in an arc-shaped structure, and a plurality of the damping members (6) are evenly arranged in a clockwise or counterclockwise direction.

5. The bearing for bridge seismic reduction and isolation according to claim 4, characterized in that: It also includes an articulated seat (8), which is provided on the inner wall of the cavity, the outer wall of the outer limiting ring (5), and the inner wall of the outer limiting ring (5), and the two ends of the damping member (6) and the two ends of the leaf spring (4) are rotatably connected via the articulated seat (8).

6. The bearing for bridge seismic reduction and isolation according to claim 2 or 4, characterized in that: The inner diameter of the inner limiting ring (3) is greater than or equal to the outer diameter of the cylindrical structure.

7. The bearing for bridge seismic isolation according to claim 3, characterized in that: The number of the elastic components (2) is at least three groups, and the multiple groups of the elastic components (2) are evenly arranged at the lower end of the upper seat plate (1), and the upper seat plate (1) can be rotated around the horizontal direction by different compression amounts of each group of elastic components (2).

8. The bearing for bridge seismic isolation according to claim 7, characterized in that: The mold cavity is cylindrical, and the bottom surface of the mold cavity includes a plane (7.1) and a spherical surface (7.2). The plane (7.1) is located at the center of the bottom surface, and the spherical surface (7.2) is located around the plane (7.1).

9. The bearing for bridge seismic isolation according to claim 8, characterized in that: The inner limiting ring (3), the outer limiting ring (5) and the cavity are arranged coaxially.

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