Shock absorption and isolation support with additional frictional damping

Abstract

The utility model provides a seismic mitigation and isolation support with additional friction damping, which comprises a damper and a lower seat plate, a middle seat plate and an upper seat plate which are sequentially arranged from bottom to top, the damper comprises a piston rod, a cylinder body, an upper end cover and a lower end cover, one end of the cylinder body is connected with the upper end cover, the other end of the cylinder body is connected with the lower end cover, the cylinder body is provided with an inner cavity, and the piston rod comprises a friction piston. The friction piston is arranged in the inner cavity, and at least part of the inner cavity wall of the cylinder body can be in interference fit with the friction piston; the high-energy-consumption vertical anti-drawing beam-falling-prevention device has the good functions of high energy consumption, vertical anti-drawing and beam-falling-prevention at the limit displacement position, and can meet the actual working condition requirement of a high-intensity earthquake area; and for a bridge or a building structure in a high-intensity earthquake area, a tensile structure, an energy consumption structure and a beam falling prevention structure do not need to be additionally arranged, the structural complexity of an anti-seismic structural system can be reduced, construction, installation and daily maintenance are facilitated, and the capital construction cost is reduced to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of bridge and building structure technology, and in particular to a seismic isolation bearing with additional friction damping. Background Technology

[0002] Currently, commonly used seismic isolation bearings mainly include hyperboloid seismic isolation bearings, lead-core rubber bearings, high-damping rubber bearings, metal-damped seismic isolation bearings, and viscous-damped seismic isolation bearings. These bearings are well-suited for conventional bridge structures and areas with moderate seismic intensity, but their functionality is somewhat limited in high-intensity seismic zones.

[0003] In high-intensity earthquake zones, especially those with seismic intensity of 9 or higher, bridge and building seismic isolation devices not only need to possess conventional seismic isolation functions but also need to consider vertical seismic forces and long-period seismic forces. However, most existing seismic isolation bearings are single-function, often lacking good vertical tensile strength, high energy dissipation capacity, and anti-falling beam function at ultimate displacement. This makes it difficult for existing seismic isolation bearings to meet the actual working conditions in high-intensity earthquake zones. Under actual working conditions in high-intensity earthquake zones, in addition to installing seismic isolation bearings, it is often necessary to additionally install tensile structures, energy dissipation structures, and anti-falling beam structures in bridge or building structures to meet the actual working conditions. However, this also leads to an overly complex seismic-resistant structural system, causing many inconveniences in construction and design. Excessive additional structural components also result in poor economic efficiency in bridge construction and difficulties in maintenance. Utility Model Content

[0004] In view of this, the present invention aims to propose a seismic isolation bearing with additional friction damping to solve the problem that the existing seismic isolation bearings do not have good vertical tensile strength, high energy dissipation function and anti-beam falling function at the ultimate displacement, and are difficult to meet the actual working conditions requirements of high-intensity seismic zones.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A vibration damping and isolation bearing with additional friction damping includes a damper and a lower bearing plate, a middle bearing plate, and an upper bearing plate arranged sequentially from bottom to top. The damper includes a piston rod, a cylinder, an upper end cover, and a lower end cover. One end of the cylinder is connected to the upper end cover, and the other end is connected to the lower end cover. The cylinder has an inner cavity. The piston rod includes a friction piston, which is disposed in the inner cavity. At least a portion of the inner cavity wall of the cylinder can be interference-fitted with the friction piston. One end of the damper is connected to the upper bearing plate via the piston rod, and the other end is connected to the lower bearing plate; alternatively, one end of the damper is connected to the lower bearing plate via the piston rod, and the other end is connected to the upper bearing plate.

[0007] Furthermore, the piston rod includes a first connecting rod, which is connected to the friction piston. The first connecting rod extends toward the upper end cover and passes through the upper end cover to the outside of the cylinder body. The end of the first connecting rod away from the friction piston is connected to the upper seat plate or the lower seat plate.

[0008] Furthermore, the inner cavity includes a conical cavity, and the friction piston is disposed in the conical cavity. The conical sidewall of the conical cavity can be interference-fitted with the friction piston. The direction from the first connecting rod to the lower end cover is denoted as K. Along the direction of K, the cross-sectional diameter of the conical cavity gradually increases. The minimum cross-sectional diameter of the conical cavity is less than the maximum outer diameter of the friction piston and less than the maximum cross-sectional diameter of the conical cavity.

[0009] Furthermore, along the K direction, the friction piston includes a conical segment and a cylindrical segment connected in sequence, and the cross-sectional diameter of the conical segment gradually increases.

[0010] Furthermore, the outer diameter of the first connecting rod is less than or equal to the minimum outer diameter of the friction piston. Along the K direction, the inner cavity includes a cylindrical cavity and a conical cavity connected in sequence, and the outer diameter of the first connecting rod is less than the inner diameter of the cylindrical cavity.

[0011] Furthermore, the damper includes a guide band, the upper end cover has an assembly hole, the first connecting rod is disposed in the assembly hole and passes through the assembly hole, the inner wall of the assembly hole is provided with an annular groove, and the guide band is disposed in the annular groove to position and guide the first connecting rod.

[0012] Furthermore, both ends of the cylinder body are provided with threaded ports that communicate with the inner cavity. The threaded port that connects to the upper end cover is referred to as the first threaded port, and the threaded port that connects to the lower end cover is referred to as the second threaded port. The outer wall of the upper end cover is provided with external threads and is connected to the first threaded port by a threaded connection. The lower end cover includes a threaded post, and the threaded post is connected to the second threaded port by a threaded connection.

[0013] Furthermore, one end of the damper is hinged to the upper seat plate via a piston rod, and the other end is hinged to the lower seat plate; or, one end of the damper is hinged to the lower seat plate via a piston rod, and the other end is hinged to the upper seat plate.

[0014] Furthermore, a first ball head is provided at the end of the first connecting rod away from the friction piston, the lower end cover includes a threaded post and a second connecting rod connected to the threaded post, the second connecting rod is provided on the side of the threaded post away from the piston rod, the second ball head is provided at the end of the second connecting rod away from the piston rod, the upper seat plate and the lower seat plate are both provided with concave ball grooves, and the first ball head and the second ball head are both set in the corresponding concave ball grooves in a manner that allows them to rotate relative to the concave ball grooves.

[0015] Furthermore, the seismic isolation bearing includes a tension plate, which is disposed outside the opening of the concave spherical groove. The tension plate is connected to the upper or lower seat plate, and a hinge cavity is formed between the tension plate and the concave spherical groove. The tension plate is provided with an assembly port, through which the first or second connecting rod passes. The first or second ball head is disposed in the hinge cavity in a manner that allows it to rotate relative to the concave spherical groove. The maximum opening size of the assembly port is smaller than the diameter of the first or second ball head.

[0016] Compared with existing technologies, the seismic isolation bearing with additional friction damping described in this utility model has the following advantages:

[0017] This utility model describes a seismic isolation bearing with additional friction damping. By installing a cylindrical friction damper on the seismic isolation bearing, on the one hand, the interference fit between the friction piston and the inner wall of the cylinder generates a large normal pressure on the contact surface. When there is a large displacement between the upper and lower seat plates (such as during an earthquake), a large frictional resistance is generated between the friction piston and the inner wall of the cylinder. The frictional resistance output by the damper not only provides a good energy dissipation effect, but also generates a vertical reaction force, playing a role in vertical pull-out resistance. On the other hand, in extreme application scenarios such as severe earthquakes, even if the friction piston breaks through the interference fit of the inner wall, causing the seismic isolation bearing and damper to move to their extreme positions, the friction piston can still abut against the end cap structure to prevent further displacement, thus playing an effective role in limiting and preventing beam fall.

[0018] Therefore, this application enables the seismic isolation bearing to possess excellent functions of high energy dissipation, vertical tensile resistance, and anti-falling beam at ultimate displacement, which can meet the actual working conditions requirements of high-intensity seismic zones. At the same time, for bridges or building structures in high-intensity seismic zones, there is no need to set up additional tensile structures, energy dissipation structures, and anti-falling beam structures, which helps to reduce the structural complexity of the seismic-resistant structural system, facilitates construction, installation, and daily maintenance, and also reduces infrastructure costs to a certain extent.

[0019] Furthermore, the interference fit between the friction piston and the inner wall of the cylinder generates a large normal pressure on the contact surface. This allows for greater frictional resistance between the piston piston and the inner wall of the cylinder during relative movement (especially when the piston rod moves away from the lower end cover). This not only improves the traditional double-sleeve structure of the cylindrical friction damper to a single cylinder, but also eliminates the need for an additional pre-tightening device, further reducing the number of components. This reduces the structural complexity of the damper, saves space occupied by related components, and decreases the overall size of the damper structure and the entire seismic isolation bearing. Simultaneously, the cylindrical friction damper is simple to assemble, easy to manufacture and disassemble, and convenient for maintenance and component replacement. The damper can be installed upside down without considering the installation direction, facilitating the construction and assembly of the seismic isolation bearing. Attached Figure Description

[0020] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a vibration damping and isolation bearing with additional friction damping according to an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view from a top view of a seismic isolation bearing with additional friction damping as described in an embodiment of this utility model.

[0023] Figure 3 This is another cross-sectional view from a top view of a seismic isolation bearing with additional friction damping as described in an embodiment of this utility model.

[0024] Figure 4 This is a cross-sectional view of the damper described in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the piston rod structure according to an embodiment of the present utility model;

[0026] Figure 6 This is a cross-sectional view of the cylinder body according to an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Upper seat plate; 2. Damper; 21. Piston rod; 211. First connecting rod; 2111. First ball head; 212. Friction piston; 2121. Conical section; 2122. Cylindrical section; 22. Upper end cover; 23. Cylinder body; 231. First threaded opening; 232. Second threaded opening; 233. Inner cavity; 2331. Cylindrical cavity; 2332. Conical cavity; 24. Lower end cover; 241. Threaded post; 242. Second connecting rod; 2421. Second ball head; 25. Guide belt; 31. First tensile plate; 32. Second tensile plate; 4. Tensile screw; 5. Upper spherical stainless steel; 6. Upper spherical non-metallic sliding plate; 7. Middle seat plate; 8. Lower spherical stainless steel; 9. Lower spherical non-metallic sliding plate; 10. Lower seat plate. Detailed Implementation

[0029] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to convey the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other. The term "cone" as used in this application refers to a "flat-topped cone." The directional terms such as "upper" and "lower" used in this application are all in accordance with the appended... Figure 1 The coordinates in the diagram are used as the reference.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] In high-intensity seismic zones, especially those with seismic intensity of 9 or higher, bridge and building seismic isolation devices need to not only possess conventional seismic isolation functions but also consider vertical seismic forces and long-period seismic forces. However, most existing seismic isolation bearings are single-function, often lacking good vertical tensile strength, high energy dissipation capacity, and anti-falling beam function at ultimate displacement, making it difficult for existing seismic isolation bearings to meet the actual working conditions in high-intensity seismic zones. Under actual working conditions in high-intensity seismic zones, in addition to installing seismic isolation bearings, it is often necessary to additionally install tensile structures, energy dissipation structures, and anti-falling beam structures in bridge or building structures to meet the actual working conditions in high-intensity seismic zones. However, this also leads to an overly complex seismic-resistant structural system, causing many inconveniences in construction and design. Excessive additional product structures also result in poor economic efficiency in bridge construction and difficulties in maintenance.

[0033] To address the shortcomings of existing seismic isolation bearings, such as insufficient vertical tensile strength, high energy dissipation capacity, and anti-beam-falling function at ultimate displacement, which make them unsuitable for the actual working conditions in high-intensity seismic zones, this embodiment proposes a seismic isolation bearing with additional friction damping, as shown in the attached figure. Figure 1-6As shown, the vibration damping and isolation bearing includes a damper 2 and a lower seat plate 10, a middle seat plate 7, and an upper seat plate 1 arranged sequentially from bottom to top. The damper 2 is a cylindrical friction damper, which includes a piston rod 21, a cylinder 23, an upper end cover 22, and a lower end cover 24. One end of the cylinder 23 is connected to the upper end cover 22, and the other end is connected to the lower end cover 24. The cylinder 23 has an inner cavity 233. The piston rod 21 includes a friction piston 212, which is disposed in the inner cavity 233. At least a portion of the inner cavity wall of the cylinder 23 in the direction away from the lower end cover 24 can be interference-fitted with the friction piston 212. One end of the damper 2 is connected to the upper seat plate 1 through the piston rod 21, and the other end is connected to the lower seat plate 10. Alternatively, one end of the damper 2 is connected to the lower seat plate 10 through the piston rod 21, and the other end is connected to the upper seat plate 1.

[0034] This application uses a cylindrical friction damper installed on the seismic isolation bearing. On the one hand, the interference fit between the friction piston 212 and the inner wall of the cylinder 23 can generate a large normal pressure on the contact surface. When there is a large displacement between the upper seat plate 1 and the lower seat plate 10 (such as during an earthquake), a large frictional resistance can be generated between the friction piston 212 and the inner wall of the cylinder 23. The frictional resistance output by the damper 2 not only provides a good energy dissipation effect, but also generates a vertical reaction force, which plays a role in vertical pull-out resistance.

[0035] On the other hand, in extreme application scenarios such as severe earthquakes, even if the friction piston 212 breaks through the interference fit of the inner cavity wall, causing the seismic isolation support and damper 2 to move to the limit position, the friction piston 212 can still abut against the end cover structure to prevent further displacement and play an effective role in limiting and preventing beam fall.

[0036] Therefore, this application enables the seismic isolation bearing to possess the functions of high energy dissipation, vertical tensile resistance, and anti-falling beam at ultimate displacement, which can meet the actual working conditions requirements of high-intensity seismic zones. At the same time, for bridges or building structures in high-intensity seismic zones, there is no need to set up additional tensile structures, energy dissipation structures, and anti-falling beam structures, which helps to reduce the structural complexity of the seismic-resistant structural system, facilitates construction, installation, and daily maintenance, and also reduces infrastructure costs to a certain extent.

[0037] Furthermore, the interference fit between the friction piston 212 and the inner wall of the cylinder 23 generates a large normal pressure on the contact surface. This allows for greater frictional resistance between the friction piston 212 and the inner wall of the cylinder 23 during relative movement between the piston rod 21 and the cylinder 23 (especially when the piston rod 21 moves away from the lower end cover 24). This not only improves the traditional double-sleeve structure of the cylindrical friction damper to a single cylinder (i.e., cylinder 23), but also eliminates the need for an additional pre-tightening device, further reducing the number of components. This reduces the structural complexity of the damper, saves space occupied by related components, and reduces the overall size of the damper structure and the entire seismic isolation support. Simultaneously, the cylindrical friction damper is simple to assemble, easy to manufacture and disassemble, and convenient for maintenance and component replacement. (See attached figure) Figure 1 For illustration purposes, damper 2 can be installed upside down without considering the installation direction, which facilitates the construction and assembly of the seismic isolation bearing.

[0038] The piston rod 21 includes a first connecting rod 211, which is connected to the friction piston 212. The first connecting rod 211 extends toward the upper end cover 22 and passes through the upper end cover 22 to the outside of the cylinder body 23. The end of the first connecting rod 211 away from the friction piston 212 is connected to the upper seat plate 1 or the lower seat plate 10. This allows one end of the piston rod 21 to be connected to the upper seat plate 1 or the lower seat plate 10, while the other end provides frictional resistance between the friction piston 212 and the inner cavity wall.

[0039] The inner cavity 233 includes a conical cavity 2332, and the friction piston 212 is disposed in the conical cavity 2332. The conical sidewall of the conical cavity 2332 can be interference-fitted with the friction piston 212. Specifically, the direction from the first connecting rod 211 to the lower end cover 24 is denoted as K. Along the direction of K, the cross-sectional diameter of the conical cavity 2332 gradually increases. The minimum cross-sectional diameter of the conical cavity 2332 is less than the maximum outer diameter of the friction piston 212 and less than the maximum cross-sectional diameter of the conical cavity 2332. This allows the friction piston 212 to have a certain amount of room to move in the conical cavity 2332. With the installation of the damper 2, it allows the upper seat plate 1 and the lower seat plate 10 to generate a certain displacement distance in the vertical direction, so as to adapt to the normal vertical displacement of the bridge or building structure in daily life. On the other hand, when the piston rod 21 moves away from the lower end cover 24, the friction piston 212 can gradually approach the conical sidewall of the conical cavity 2332 until an interference fit state with a certain frictional resistance is generated, so that the damper 2 can smoothly output the gradually increasing damping force.

[0040] Along the K direction, the friction piston 212 includes a conical segment 2121 and a cylindrical segment 2122 connected in sequence, with the cross-sectional diameter of the conical segment 2121 gradually increasing. The maximum outer diameter of the conical segment 2121 is equal to the outer diameter of the cylindrical segment 2122, both of which can be considered as the maximum outer diameter of the friction piston 212. Therefore, when the friction piston 212 is in an interference fit with the conical sidewall of the conical cavity 2332, at least a portion of the conical surface of the conical segment 2121 can contact and form an interference fit with the conical sidewall of the conical cavity 2332, which helps to increase the contact area between the two, correspondingly increasing the output frictional resistance to a certain extent, and also avoiding excessively concentrated stress points when the two are in contact. Preferably, the conical segment 2121 and the cylindrical segment 2122 have a smooth transition connection.

[0041] The outer diameter of the first connecting rod 211 is less than or equal to the minimum outer diameter of the friction piston 212. Along the K direction, the inner cavity 233 includes a cylindrical cavity 2331 and a conical cavity 2332 connected in sequence. The outer diameter of the first connecting rod 211 is less than the inner diameter of the cylindrical cavity 2331, allowing one end of the first connecting rod 211 to connect to the friction piston 212, and the other end to extend along the cylindrical cavity 2331 until it penetrates to the outside of the cylinder body 23. Simultaneously, unnecessary contact is avoided between the first connecting rod 211 and the sidewall of the cylindrical cavity 2331, ensuring a stable output of damping force between the conical section 2121 and the conical cavity 2332. Furthermore, the inner diameter of the cylindrical cavity 2331 is equal to the minimum cross-sectional diameter of the conical cavity 2332. Similarly, a smooth transition is preferably formed between the cylindrical cavity 2331 and the conical cavity 2332.

[0042] The surface of the piston rod 21 and the inner wall of the cylinder 23 will be surface treated, such as by applying a coating or surface heat treatment, to increase the hardness and wear resistance of the components, and to give the product better low-cycle fatigue performance while stabilizing the damping force.

[0043] The damper 2 includes a guide belt 25, the upper end cover 22 has an assembly hole, the first connecting rod 211 is disposed in the assembly hole and passes through the assembly hole, the inner wall of the assembly hole is provided with an annular groove, and the guide belt 25 is disposed in the annular groove to position and guide the first connecting rod 211, so that the piston rod 21 can only move along or against the direction of K relative to the cylinder 23.

[0044] For the installation of the upper end cover 22 and the lower end cover 24, both ends of the cylinder body 23 are provided with threaded ports communicating with the inner cavity 233. The threaded port connected to the upper end cover 22 is designated as the first threaded port 231, and the threaded port connected to the lower end cover 24 is designated as the second threaded port 232. The outer wall of the upper end cover 22 is provided with external threads and is connected to the first threaded port 231 by a threaded connection. The lower end cover 24 includes a threaded post 241, which is connected to the second threaded port 232 by a threaded connection. This ensures the reliability of the assembly and also improves the ease of disassembly and assembly of the damper 2, facilitating the production, assembly, disassembly, and maintenance of the damper 2.

[0045] One end of the damper 2 is hinged to the upper seat plate 1 via the piston rod 21, and the other end is hinged to the lower seat plate 10. Alternatively, one end of the damper 2 is hinged to the lower seat plate 10 via the piston rod 21, and the other end is hinged to the upper seat plate 1. This hinged connection allows the damper 2 to allow for a certain horizontal movement between the upper and lower seat plates 1 and 10 when connected. The damper 2 can then generate a certain tilt angle to accommodate the normal horizontal displacement of the bridge or building structure during normal operation. It should be noted that when the seismic isolation bearing is in its normal state, the friction piston 212 and the conical cavity 2332 have an initial gap and do not contact each other. At this time, the bridge or building structure is allowed to generate a certain horizontal or vertical displacement, and the damper 2 is in a non-operating state, requiring no frictional resistance.

[0046] The first connecting rod 211 has a first ball head 2111 at the end away from the friction piston 212. The lower end cover 24 includes a threaded post 241 and a second connecting rod 242 connected to the threaded post 241. The second connecting rod 242 is located on the side of the threaded post 241 away from the piston rod 21, and a second ball head 2421 is located at the end of the second connecting rod 242 away from the piston rod 21. Both the upper seat plate 1 and the lower seat plate 10 are provided with concave ball grooves. The first ball head 2111 and the second ball head 2421 are both set in the corresponding concave ball grooves in a manner that allows them to rotate relative to the concave ball grooves. Since the damper 2 can be installed upside down without considering the installation direction, for the two types of concave ball grooves, namely the concave ball groove of the upper seat plate 1 and the concave ball groove of the lower seat plate 10, the first ball head 2111 can be set in one concave ball groove, and the second ball head 2421 can be set in the other concave ball groove.

[0047] To improve the assembly reliability of the damper 2 with the upper seat plate 1 and the lower seat plate 10, for any ball head structure and the corresponding concave ball groove, the vibration damping and isolation bearing includes a tension plate. The tension plate is disposed outside the groove opening of the concave ball groove. The tension plate is connected to the upper seat plate 1 or the lower seat plate 10. A hinge cavity is formed between the tension plate and the concave ball groove. The first ball head 2111 or the second ball head 2421 is disposed in the hinge cavity in a manner that allows it to rotate relative to the concave ball groove. The tension plate is provided with an assembly opening. The maximum opening size of the assembly opening is smaller than the diameter of the first ball head 2111 or the diameter of the second ball head 2421. This allows the first connecting rod 211 or the second connecting rod 242 to pass through the assembly opening of the tension plate and insert the ball head structure into the corresponding concave ball groove. The stop limit of the tension plate ensures that the ball head structure will not come out of the concave ball groove, which helps to improve the assembly reliability of the damper 2 with the upper seat plate 1 and the lower seat plate 10, and ensures that the damper 2 provides long-term effective damping.

[0048] Using the upper seat plate 1 and the lower seat plate 10 as vertical reference benchmarks, the tensile plate is divided into a first tensile plate 31 and a second tensile plate 32. The first tensile plate 31 is provided on the side of the upper seat plate 1 facing the lower seat plate 10. The first tensile plate 31 is located below the concave ball groove of the upper seat plate 1 and is connected to the upper seat plate 1 by fasteners. The second tensile plate 32 is provided on the side of the lower seat plate 10 facing the upper seat plate 1. The second tensile plate 32 is located above the concave ball groove of the lower seat plate 10 and is connected to the lower seat plate 10 by fasteners. Preferably, the fasteners can be tensile screws 4 or other fasteners.

[0049] For the lower seat plate 10, the middle seat plate 7, and the upper seat plate 1, the middle seat plate 7 is disposed between the upper seat plate 1 and the lower seat plate 10, an upper spherical friction pair is disposed between the upper seat plate 1 and the middle seat plate 7, and a lower spherical friction pair is disposed between the lower seat plate 10 and the middle seat plate 7; the upper spherical friction pair includes an upper spherical stainless steel 5 and an upper spherical non-metallic sliding plate 6, and the lower spherical friction pair includes a lower spherical stainless steel 8 and a lower spherical non-metallic sliding plate 9.

[0050] Specifically, the bottom of the upper seat plate 1 is a concave spherical surface covered with an upper spherical stainless steel 5, and the upper part of the middle seat plate 7 is a convex spherical surface inlaid with an upper spherical non-metallic sliding plate 6. These two components form an upper spherical friction pair, enabling relative sliding and / or rotation. The top of the lower seat plate 10 is a concave spherical surface covered with a lower spherical stainless steel 8, and the lower part of the middle seat plate 7 is a convex spherical surface inlaid with a lower spherical non-metallic sliding plate 9. These two components form a lower spherical friction pair, enabling relative sliding and / or rotation. This allows the seismic isolation bearing to adapt to the sliding and / or rotational requirements of bridges or building structures, and also satisfies the hysteretic performance requirements of the bearing under seismic conditions through the combined motion of the hyperboloid friction pair. Furthermore, the hyperboloid friction pair typically does not employ lubrication measures to increase the energy dissipation capacity of the bearing under seismic conditions.

[0051] In the vertical projection, the projections of the upper seat plate 1 and the lower seat plate 10 can completely cover the projection of the middle seat plate 7, so that the damper 2 can be set on the outside of the middle seat plate 7 without affecting the assembly and relative movement between the lower seat plate 10, the middle seat plate 7, and the upper seat plate 1, and also ensures that there is no spatial interference in the installation of the damper 2.

[0052] The seismic isolation bearing includes multiple dampers 2, as shown in the attached figure. Figure 2 , 3 As shown, the dampers 2 are arranged in an array around the center plate 7 to meet different mechanical performance requirements of the support. Since the schematic diagram in this application shows a circular center plate 7, the dampers 2 are arranged in a circular array. If the center plate 7 is square or other shapes, the dampers 2 can also be arranged in a linear array or other conventional array method. Furthermore, by increasing the external dimensions of the upper plate 1 and the lower plate 10, more dampers 2 can be installed.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A seismic isolation bearing with additional friction damping, characterized in that, The vibration damping and isolation bearing includes a damper (2) and a lower seat plate (10), a middle seat plate (7), and an upper seat plate (1) arranged sequentially from bottom to top. The damper (2) includes a piston rod (21), a cylinder (23), an upper end cover (22), and a lower end cover (24). One end of the cylinder (23) is connected to the upper end cover (22), and the other end is connected to the lower end cover (24). The cylinder (23) has an inner cavity (233). The piston rod (21) includes a friction... The piston (212) is disposed in the inner cavity (233), and at least part of the inner cavity wall of the cylinder (23) is capable of interference fit with the friction piston (212); one end of the damper (2) is connected to the upper seat plate (1) through the piston rod (21), and the other end is connected to the lower seat plate (10), or one end of the damper (2) is connected to the lower seat plate (10) through the piston rod (21), and the other end is connected to the upper seat plate (1); Both ends of the cylinder body (23) are provided with threaded ports that communicate with the inner cavity (233). The threaded port that connects to the upper end cover (22) is designated as the first threaded port (231), and the threaded port that connects to the lower end cover (24) is designated as the second threaded port (232). The outer wall of the upper end cover (22) is provided with external threads and is connected to the first threaded port (231) by a threaded connection. The lower end cover (24) includes a threaded post (241), and the threaded post (241) is connected to the second threaded port (232) by a threaded connection.

2. The seismic isolation bearing with additional friction damping according to claim 1, characterized in that, The piston rod (21) includes a first connecting rod (211), which is connected to the friction piston (212). The first connecting rod (211) extends toward the upper end cover (22) and passes through the upper end cover (22) to the outside of the cylinder body (23). The end of the first connecting rod (211) away from the friction piston (212) is connected to the upper seat plate (1) or the lower seat plate (10).

3. A seismic isolation bearing with additional friction damping according to claim 2, characterized in that, The inner cavity (233) includes a conical cavity (2332), and the friction piston (212) is disposed in the conical cavity (2332). The conical sidewall of the conical cavity (2332) can be interference-fitted with the friction piston (212). The direction from the first connecting rod (211) to the lower end cover (24) is denoted as K. Along the direction of K, the cross-sectional diameter of the conical cavity (2332) gradually increases. The minimum cross-sectional diameter of the conical cavity (2332) is less than the maximum outer diameter of the friction piston (212) and less than the maximum cross-sectional diameter of the conical cavity (2332).

4. A seismic isolation bearing with additional friction damping according to claim 3, characterized in that, Along the K direction, the friction piston (212) includes a conical segment (2121) and a cylindrical segment (2122) connected in sequence, and the cross-sectional diameter of the conical segment (2121) gradually increases.

5. A seismic isolation bearing with additional friction damping according to claim 3, characterized in that, The outer diameter of the first connecting rod (211) is less than or equal to the minimum outer diameter of the friction piston (212). Along the K direction, the inner cavity (233) includes a cylindrical cavity (2331) and a conical cavity (2332) connected in sequence. The outer diameter of the first connecting rod (211) is less than the inner diameter of the cylindrical cavity (2331).

6. A seismic isolation bearing with additional friction damping according to claim 2, characterized in that, The damper (2) includes a guide band (25), the upper end cover (22) has an assembly hole, the first connecting rod (211) is disposed in the assembly hole and passes through the assembly hole, the inner wall of the assembly hole is provided with an annular groove, and the guide band (25) is disposed in the annular groove to position and guide the first connecting rod (211).

7. A seismic isolation bearing with additional friction damping according to claim 1, characterized in that, One end of the damper (2) is hinged to the upper seat plate (1) via the piston rod (21), and the other end is hinged to the lower seat plate (10). Alternatively, one end of the damper (2) is hinged to the lower seat plate (10) via the piston rod (21), and the other end is hinged to the upper seat plate (1).

8. A seismic isolation bearing with additional friction damping according to claim 2, characterized in that, The first connecting rod (211) is provided with a first ball head (2111) at the end away from the friction piston (212). The lower end cover (24) includes a threaded post (241) and a second connecting rod (242) connected to the threaded post (241). The second connecting rod (242) is provided on the side of the threaded post (241) away from the piston rod (21). The second connecting rod (242) is provided with a second ball head (2421) at the end away from the piston rod (21). The upper seat plate (1) and the lower seat plate (10) are both provided with concave ball grooves. The first ball head (2111) and the second ball head (2421) are both set in the corresponding concave ball grooves in a manner that allows them to rotate relative to the concave ball grooves.

9. A seismic isolation bearing with additional friction damping according to claim 8, characterized in that, The vibration damping and isolation bearing includes a tensile plate, which is disposed outside the opening of the concave spherical groove. The tensile plate is connected to the upper seat plate (1) or the lower seat plate (10). A hinge cavity is formed between the tensile plate and the concave spherical groove. The tensile plate is provided with an assembly port. The first connecting rod (211) or the second connecting rod (242) passes through the assembly port of the tensile plate. The first ball head (2111) or the second ball head (2421) is disposed in the hinge cavity in a manner that allows it to rotate relative to the concave spherical groove. The maximum opening size of the assembly port is smaller than the diameter of the first ball head (2111) or the diameter of the second ball head (2421).

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