Support capable of conveniently and repeatedly achieving seismic mitigation and isolation functions

Abstract

The utility model provides a support capable of conveniently and repeatedly achieving a shock absorption and isolation function. The support comprises an upper seat plate, a spherical crown lining plate assembly, a lower seat plate, a shock absorption ball pendulum assembly and a limiting device. The limiting device comprises limiting plates arranged on the lower seat plate at equal intervals, a plurality of through grooves are formed in the limiting plates, one part of the through grooves are used for fixing the limiting device and the lower seat plate, and the other part of the through grooves are used for standby application; the shear pin is inserted into the groove and the through groove so that the limiting plate and the lower base plate can be rapidly connected, and the shear pin is composed of a connecting part and a breaking part. According to the utility model, a preset safe fracture mechanism is provided, and the damage position can be controlled when the support is subjected to an excessive load, so that the limiting plate and the lower support plate are prevented from being greatly deformed, the main structure is prevented from being damaged, the support is allowed to conveniently and repeatedly use the original seismic mitigation and isolation support system after an earthquake, and the service life of the support is prolonged. And the damaged shear pin is replaced quickly instead of replacing the whole support, so that unnecessary waste is avoided, and the economical efficiency of the support is improved.

Description

Technical Field

[0001] The utility model belongs to the field of bridge bearings, and particularly relates to a bearing that can conveniently and repeatedly realize the seismic isolation and vibration reduction function. Background Art

[0002] The existing seismic isolation and vibration reduction bearing systems generally adopt the method of combining shear pins or shear bolts with a limit ring to realize the function of the limiting device. This design scheme can make the bearing play a hard anti-limiting role under normal and frequent earthquake conditions; when encountering earthquake forces exceeding the design threshold, the limiting device should activate the sliding mechanism of the bearing by shearing and breaking, so as to play its seismic isolation and vibration reduction role; however, this design has obvious limitations and defects. First of all, shear pins or shear bolts are mainly designed to bear shear forces and usually do not have the function of anti-pulling. This leads to the fact that under complex dynamic loads, these limiting devices may be subjected to unexpected pulling forces, thus affecting their overall performance and reliability; in addition, the combination of shear pins or shear bolts and the limit ring often generates additional bending moments when bearing horizontal forces. These bending moments will cause the shear elements to fail before reaching their design limits, thus losing the limiting function; more critically, for the limiting device designed in this way, the control of the fracture point is extremely inaccurate after fracture, and the remaining parts of the damaged shear elements are often difficult to completely remove from the lower seat plate, which greatly increases the difficulty and cost of post-earthquake maintenance. Since the shear element and the lower seat plate are usually in a tight fit or threaded connection, it is extremely difficult to replace the limiting device after the earthquake. Because after the limiting device is damaged, due to the uncertainty of the shear pin damage, it is often difficult to replace the limiting device. Therefore, generally after the earthquake, the entire seismic isolation and vibration reduction bearing system is replaced as a whole. This not only causes the overall waste of the bearing, but also makes the bearing unable to be reused.

[0003] Therefore, there are many limitations in the design and function realization of the existing seismic isolation and vibration reduction bearing systems, especially in terms of inaccurate fracture point control and difficult maintenance. These problems not only affect the safety and reliability of the bearing, but also increase the maintenance cost. There is an urgent need to overcome them through new technical solutions. At present, no effective solutions have been proposed for the problems in the related technologies. Summary of the Invention

[0004] In view of the problems in the related technologies, the utility model provides a bearing that can conveniently and repeatedly realize the seismic isolation and vibration reduction function, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] A bearing that can conveniently and repeatedly realize the seismic isolation and vibration reduction function includes an upper seat plate, a spherical crown liner assembly, a lower seat plate, a damping spherical pendulum assembly and a limiting device.

[0006] A spherical crown liner assembly is arranged on the lower surface of the upper seat plate;

[0007] A shock-absorbing ball pendulum assembly is arranged below the ball crown lining assembly;

[0008] The upper surface of the lower seat plate is provided with a concave spherical surface matching with the lower surface of the shock-absorbing ball pendulum assembly;

[0009] The lower seat plate is provided with a plurality of grooves; the upper surface of the lower seat plate is provided with a limiting device;

[0010] Preferably, in order to facilitate the connection and assembly, the limiting device is positioned and fixed, and the limiting device includes a limiting plate and a shear pin. In order to ensure rapid replacement after an earthquake, the limiting plate is provided with a plurality of through grooves at equal distances;

[0011] A portion of the through groove is used for installing the fixed limit device and the lower seat plate, and the remaining portion of the through groove is used as a spare.

[0012] Furthermore, the through slot and the groove correspond to each other up and down, and the shear pin is inserted into the groove and the through slot to facilitate the quick connection of the limit plate and the lower seat plate;

[0013] Furthermore, in order to ensure that the position of damage can be controlled when subjected to excessive load, thereby protecting the limit plate and the lower seat plate from large deformation and the main structure from damage, the shear pin is composed of a connecting part and a breaking part;

[0014] Furthermore, the cross section of the connecting portion of the shear pin is circular or rectangular, and the fracture

[0015] The minimum cross-sectional dimension of the connecting part is 0.3-0.7 times the maximum cross-sectional dimension of the connecting part;

[0016] Furthermore, in order to tightly connect the limiting device and the lower seat plate, the shapes of the groove and the through groove match the shear pin connecting portion, so as to achieve a tight fit between the shear pin and the groove and the through groove.

[0017] Preferably, the limiting device is arranged in a rectangular shape on the upper surface of the lower seat plate.

[0018] Preferably, the limiting device is arranged in a circular shape on the upper surface of the lower seat plate.

[0019] Preferably, in order to further enhance the connection stability between the limit device and the lower seat plate, a plurality of threads are provided on the side of the connection portion of the shear pin to increase the connection strength; in order to facilitate the disassembly and assembly operations, a hexagonal countersunk hole is provided on the top of the connection portion of the shear pin to facilitate the use of tools for tightening and disassembly.

[0020] The technical solution of the utility model has the following beneficial effects:

[0021] 1. Preset safety fracture mechanism: A pre-fracture point is designed in the middle of the shear pin, ensuring that the position of damage can be controlled when subjected to excessive loads, thereby protecting the limit plate and the lower support plate from large deformations and the main structure from damage.

[0022] 2. Maintenance and economy: The design of the pre-fracture point and the optimized selection of the shear pin can reduce maintenance costs without sacrificing performance. Since individual damaged parts can be replaced, the service life of the entire seismic isolation bearing is extended, protecting the limit plate and the lower support plate from large deformations and the main structure from damage, enabling rapid and accurate replacement of the limiting device. Spare shear pins can be installed during maintenance, and the maintenance process is simple and efficient.

[0023] 3. Convenient reuse: The present utility model allows for the convenient reuse of the original seismic isolation and energy dissipation bearing system after an earthquake. By quickly replacing the damaged shear pins instead of the entire bearing, unnecessary waste is avoided, significantly improving resource utilization and economy. Brief Description of the Drawings

[0024] Figure 1 is a schematic diagram of the main structure of the present utility model;

[0025] Figure 2 is a sectional view taken along the A-A plane of the present utility model;

[0026] Figure 3 is a sectional view taken along the B-B plane of the present utility model;

[0027] Figure 4 is a schematic diagram of the circular structure of the connection part of the shear pin;

[0028] Figure 5 is a schematic diagram of the square structure of the connection part of the shear pin;

[0029] Figure 6 is a schematic diagram of the circular structure of the limiting device 4.

[0030] In the figure, 1. upper seat plate; 2. spherical crown liner assembly; 3. lower seat plate; 3-1 groove; 4. limit plate; 4-1 through groove; 4-2 shear pin; 4-2-1 connection part; 4-2-2 fracture part; 5. seismic isolation spherical pendulum assembly. Detailed Embodiment

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0032] Embodiment 1

[0033] Please refer to Figures 1-4, a bearing that can conveniently and repeatedly achieve the seismic isolation and vibration reduction function, including an upper seat plate 1, a spherical crown liner assembly 2, a lower seat plate 3, a damping spherical pendulum assembly 5 and a limiting device 4.

[0034] The spherical crown liner assembly 2 is arranged on the lower surface of the upper seat plate 1;

[0035] The damping spherical pendulum assembly 5 is arranged below the spherical crown liner assembly 2;

[0036] The upper surface of the lower seat plate 3 is provided with a concave spherical surface that cooperates with the lower surface of the damping spherical pendulum assembly 5;

[0037] The lower seat plate 3 is provided with a groove 3-1;

[0038] In order to facilitate connection and assembly and position and fix the limiting device, the limiting device includes a limiting plate arranged on the lower seat plate, and through grooves 4-1 are equidistantly arranged on the limiting plate;

[0039] The through grooves 4-1 and the groove 3-1 are vertically corresponding, and the shear pin 4-2 is inserted into the groove 3-1 and the through groove 4-1 to facilitate the quick connection of the limiting plate 4-1 and the lower seat plate 3;

[0040] In order to ensure that the bearing can control the position of damage when suffering from excessive load, so as to protect the limiting plate 4 and the lower seat plate 3 from large deformation and the main structure from damage, the shear pin 4-2 is composed of a connecting part 4-2-1 and a fracture part 4-2-2;

[0041] The connecting part 4-2-1 of the shear pin 4-2 is circular, and the fracture part 4-2-2

[0042] The minimum cross-sectional dimension of the fracture part 4-2-2 is 0.5 times the maximum cross-sectional dimension of its connecting part 4-2-1; the shapes of the groove 3-1 and the through groove 4-1 match the shape of the shear cutting connecting part.

[0043] Embodiment 2

[0044] Refer to Figure 5 , the connecting part 4-2-1 of the shear pin 4-2 is square,

[0045] The minimum cross-sectional dimension of the fracture part 4-2-2 is 0.7 times the maximum cross-sectional dimension of its connecting part 4-2-1.

[0046] Please refer to Figure 6 , the limiting device can also be circular and is arranged on the upper surface of the lower seat plate 3.

[0047] Embodiment 3

[0048] In order to further enhance the connection stability between the limit device and the lower seat plate, a plurality of threads are provided on the side 4-2-1 of the connection part of the shear pin 4-2 to increase the connection strength; in order to facilitate the disassembly and assembly operation, a hexagonal countersunk hole is provided on the top of the connection part of the shear pin to facilitate the use of tools for tightening and disassembly.

[0049] The working principle is as follows: the design force of the limit device is determined by the shear resistance of the shear pin, ensuring the accurate control of the design force of the limit device and transforming the function of the seismic isolation bearing from a hard-resistance bearing to a seismic isolation bearing; when the horizontal force applied to the seismic isolation bearing is greater than the design force of the limit device, the shear pin breaks at the fracture part, protecting the limit plate and the lower seat plate from being basically damaged.

[0050] The limit device of the seismic isolation bearing has both pull-out and shear resistance functions. After an earthquake occurs, it is sheared by the horizontal force of the bearing, ensuring the accurate control of the horizontal ultimate bearing capacity of the limit device and exerting the functional transformation effect of the seismic isolation bearing. During an earthquake, the shear pin is sheared and damaged, causing the limit plate to lose its limit function. The bearing realizes horizontal reciprocating sliding through the synthetic action of the hyperboloid. During the reciprocating sliding process, the friction resistance of the sliding surface dissipates the seismic energy and prolongs the natural vibration period of the structure to achieve the seismic isolation effect. After the earthquake, the bearing is reset, and the self-weight of the upper structure forms a restoring force to reset the bearing, realizing that the limit device can be replaced on the bridge. The lower bearing plate can be docked with the spare hole on the limit plate, without the need to replace the entire bearing, greatly saving replacement costs, and without the need to disassemble the entire bearing, which greatly simplifies the post-earthquake maintenance process and quickly restores the traffic function of the bridge after the earthquake.

Claims

1. A bearing that can conveniently and repeatedly achieve the seismic isolation and vibration reduction function, comprising an upper seat plate (1), a spherical crown liner assembly (2), a lower seat plate (3), and a shock-absorbing spherical pendulum assembly (5), characterized in that: It further includes a limiting device; A spherical crown liner assembly (2) is arranged on the lower surface of the upper seat plate (1); a shock-absorbing spherical pendulum assembly (5) is arranged below the spherical crown liner assembly (2); a concave spherical surface matching the lower surface of the shock-absorbing spherical pendulum assembly (5) is arranged on the upper surface of the lower seat plate (3); a plurality of grooves (3-1) are arranged on the lower seat plate (3); a limiting device is arranged on the upper surface of the lower seat plate (3); the limiting device includes a limiting plate (4) and a shear pin (4-2), and a plurality of through grooves (4-1) are equidistantly arranged on the limiting plate (4); a pre-fracture point is designed in the middle of the shear pin (4-2); the shear pin (4-2) is composed of a connecting portion (4-2-1) and a fracture portion (4-2-2).

2. The bearing capable of conveniently and repeatedly realizing the seismic isolation and vibration reduction function according to claim 1, wherein: The cross-section of the connecting portion (4-2-1) is circular or rectangular, and the minimum dimension of the cross-section of the fracture portion (4-2-2) is 0.3-0.7 times the maximum dimension of the cross-section of the connecting portion (4-2-1).

3. The bearing capable of conveniently and repeatedly realizing the seismic isolation and vibration reduction function according to claim 1, characterized in that: The shapes of the groove (3-1) and the through groove (4-1) are both matched with the connecting portion (4-2-1).

4. A bearing capable of conveniently and repeatedly realizing the seismic isolation and vibration reduction function according to claim 1, characterized in that: The limiting device is arranged in a rectangular shape on the upper surface of the lower seat plate (3).

5. A bearing capable of conveniently and repeatedly realizing the seismic isolation and vibration reduction function according to claim 1, characterized in that: The limiting device is arranged in a circular shape on the upper surface of the lower seat plate (3).

6. The bearing capable of conveniently and repeatedly realizing the seismic isolation and vibration reduction function according to claim 2, characterized in that: A plurality of threads are arranged on the side surface of the connecting portion (4-2-1), and a hexagonal counterbore is arranged at the top of the connecting portion (4-2-1).

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