A three-dimensional pull-out-resistant seismic isolation bearing

Abstract

The present invention discloses a three-dimensional seismic isolation support with pull-out resistance, comprising a seismic isolation support and a self-resetting mechanism arranged around the seismic isolation support and a vertical seismic isolator on the upper part; the seismic isolation support comprises a lead core, a rubber seismic isolation pad, an upper support steel plate and a lower support steel plate; the vertical seismic isolator comprises a lower connecting plate, an upper connecting plate and an extrusion damper; the middle part of the lower surface of the lower connecting plate is fixedly connected to the middle part of the upper support steel plate, and the upper connecting plate is connected to the upper connecting plate through a plurality of extrusion dampers; the self-resetting mechanism comprises a limiting pull rod and a transverse limiting circular ring; a plurality of limiting pull rods are circumferentially fixed to the lower support steel plate; a plurality of first circular holes slidably connected to the limiting pull rods are opened on the transverse limiting circular ring, and the transverse limiting circular ring is located above the upper support steel plate. The support of the present invention can realize bidirectional seismic isolation in the horizontal direction and the vertical direction, using a lead core rubber support for seismic isolation, and using a disc spring and an extrusion damper to improve the vertical seismic isolation capacity.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering seismic isolation, and in particular to a pull-out resistant three-dimensional seismic isolation bearing. Background Art

[0002] Building structure seismic isolation technology is to extend the structural period of the structure by setting up a seismic isolation layer or isolation device at the bottom or middle of the building structure, and to provide appropriate damping to significantly reduce the seismic response of the structure, thereby effectively reducing the damage to the building structure caused by the earthquake. Among the existing seismic isolation systems, lead rubber bearings are one of the most common seismic isolation bearings. Existing research and earthquake damage have shown that lead rubber bearings can play a good seismic isolation effect in earthquakes, but lead rubber bearings will suffer some damage under the action of rare earthquakes, accompanied by a certain amount of permanent residual deformation, which is irreversible after the earthquake. This poses a great challenge to the rapid use and repair after the earthquake.

[0003] The vertical tensile strength of rubber isolation bearings is relatively poor. When the vertical tensile stress exceeds 1.0 MPa, it is very easy to cause tearing and damage between the rubber layers, causing the overturning of the building structure. Lead-core rubber isolation bearings are not suitable for some high-rise building structures or building structures that are more sensitive to vertical earthquakes. This limits the application and promotion of lead-core rubber isolation bearings in high-rise building structures and high-intensity areas. In addition, rubber isolation bearings can only perform horizontal isolation and cannot play a role in vertical earthquakes. Therefore, it is necessary to propose a three-dimensional isolation bearing with pull-out resistance to meet the horizontal and vertical isolation functions and meet the vertical pull-out resistance requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a three-dimensional seismic isolation bearing that is resistant to pull-out in order to overcome the defects of existing seismic isolation technologies. The SMA screws in the self-resetting mechanism around the seismic isolation bearing are stretched to provide vertical tensile resistance, thereby playing an anti-pull-out role. The SMA screws are bent to limit the large deformation of the seismic isolation bearing, thereby playing a limiting role. The superelastic properties of SMA are used to provide the seismic isolation bearing with good self-resetting ability, thereby ensuring the recoverability and continued use of the building structure after an earthquake. The vertical isolator provides vertical stiffness and damping for the structure, reduces the seismic energy transmitted to the structure under vertical earthquakes, and plays a role in vertical seismic isolation.

[0005] The technical solution adopted by the present invention is to provide a three-dimensional seismic isolation support with pull-out resistance, comprising a seismic isolation support, a self-resetting mechanism arranged around the seismic isolation support, and a vertical seismic isolator on the upper portion; the seismic isolation support comprises a lead core, a rubber seismic isolation pad, an upper support steel plate, and a lower support steel plate;

[0006] The vertical seismic isolator includes a lower connecting plate, an upper connecting plate and an extrusion damper; the middle portion of the lower surface of the lower connecting plate is fixedly connected to the middle portion of the upper support steel plate, and the upper connecting plate is connected to the lower connecting plate through a plurality of extrusion dampers;

[0007] The self-resetting mechanism includes a limiting rod and a transverse limiting ring; several of the limiting rods are circumferentially fixed on the lower support steel plate; several first circular holes are provided on the transverse limiting ring that are slidably connected to the limiting rods, and the transverse limiting ring is located above the upper support steel plate; the top end of the limiting rod limits the transverse limiting ring, and there is a stretching margin between the top end of the limiting rod and the upper surface of the transverse limiting ring, and there is an extrusion margin between the top end of the limiting rod and the lower surface of the lower connecting plate.

[0008] Furthermore, the limiting pull rod is an SMA screw, the middle part of the SMA screw is a deformation section, and both ends are threaded sections; the bottom end of the SMA screw is fixedly mounted on the lower support steel plate by two nuts, and a nut is installed on the top end for limiting.

[0009] Furthermore, a convex frustum is provided in the middle of the upper surface of the upper support steel plate; a convex ring is provided in the middle of the lower surface of the lower connecting plate, and a concave frustum is provided in the middle of the convex ring to engage with the convex frustum; the upper support steel plate and the lower connecting plate are fixedly connected at the convex frustum and the concave frustum by multiple screws.

[0010] Furthermore, the overlap length of the transverse limiting ring on the upper support steel plate is greater than d gap The distance from the inner ring of the horizontal limit ring to the convex ring of the lower connecting plate is d gap ; The distance from the outer edge of the upper support steel plate to the limit rod is d gap ; distance d gap Take the horizontal displacement corresponding to the shear strain of 150%-200% of the isolation bearing.

[0011] Furthermore, the extrusion damper includes a cavity, an extrusion shaft and a damping material; the extrusion shaft and the damping material are located in the cavity; the extrusion shaft includes an extrusion section in the middle and connecting sections at both ends, and the diameter of the extrusion section is larger than the diameter of the connecting section; a second circular hole is provided on the upper and lower surfaces of the cavity, and its diameter is the same as the diameter of the connecting sections at both ends of the extrusion shaft, the height of the extrusion section is smaller than the height of the cavity inner cavity, and the connecting sections at both ends of the extrusion shaft are slidably arranged in the cavity; the bottom of the cavity is fixedly connected to the lower connecting plate, and the upper end of the extrusion shaft is fixedly connected to the upper connecting plate.

[0012] Furthermore, it also includes disc springs, and multiple disc springs are alternately formed in positive and negative directions to form a disc spring assembly, and the disc spring assembly is sleeved outside the extrusion damper.

[0013] Furthermore, a plurality of limiting rings are provided on the lower surface of the upper connecting plate, and the outer diameter of the cavity is the same as the inner diameter of the limiting ring of the upper connecting plate; the two ends of the disc spring assembly respectively abut against the lower surface of the limiting ring and the upper surface of the lower connecting plate.

[0014] Furthermore, a certain distance is reserved between the bottom of the extrusion shaft and the lower connecting plate, so that when the extrusion shaft moves up and down in the cavity, the bottom of the extrusion shaft does not collide with the lower connecting plate; a certain distance is reserved between the top surface of the cavity and the lower surface of the upper connecting plate, so that when the upper connecting plate moves downward together with the extrusion shaft, the lower surface of the upper connecting plate cannot collide with the top surface of the cavity.

[0015] The beneficial effects of the present invention are as follows: the present invention provides a three-dimensional pull-out resistant seismic isolation bearing that can achieve bidirectional seismic isolation in both horizontal and vertical directions. A lead rubber bearing is used for seismic isolation in the horizontal direction, while a disc spring and an extrusion damper are used in the vertical direction to enhance the vertical seismic isolation capability. Under small and moderate earthquakes, the lead rubber bearing undergoes shear deformation, dissipating the seismic energy and reducing the amount transmitted to the upper structure. At this time, the self-resetting mechanism is in an inoperative state and does not increase the horizontal stiffness of the bearing. Under rare earthquakes, when the lead rubber bearing undergoes significant shear deformation, the SMA screw begins to bend, acting as a limiter to ensure that the seismic isolation bearing is not damaged. At the same time, the superelastic properties of the SMA screw itself are utilized to achieve post-earthquake self-reset of the structure, thereby enhancing the post-earthquake recoverability of the building structure. The bearing can also provide vertical pull-out resistance and vertical seismic isolation functions, preventing the overturning and rotation of the building structure, reducing the transmission of earthquakes to the upper structure, and effectively alleviating or even avoiding earthquake damage to the building structure and people's property. It can be widely used for three-dimensional seismic isolation in multi-story and high-rise buildings or buildings in high-intensity areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the three-dimensional pull-out-resistant seismic isolation bearing disclosed in the present invention;

[0017] Figure 2 It is a front view of the three-dimensional pull-out-resistant seismic isolation bearing disclosed in the present invention;

[0018] Figure 3 for Figure 2 Cross-sectional view along line AA;

[0019] Figure 4 This is a schematic diagram of the self-resetting mechanism disclosed in the present invention;

[0020] Figure 5 It is a schematic diagram of the vertical seismic isolator disclosed in the present invention;

[0021] Figure 6 It is a front view of the vertical seismic isolator disclosed in the present invention;

[0022] Figure 7 for Figure 6 Cross-sectional view along the midline BB;

[0023] Figure 8 This is a schematic structural diagram of the extrusion shaft disclosed in the present invention;

[0024] Figure 9 It is a schematic structural diagram of the cavity disclosed in the present invention;

[0025] Figure 10 for Figure 9 A cross-sectional view of line FF;

[0026] Figure 11 This is a schematic structural diagram of the transverse limiting ring disclosed in the present invention;

[0027] Figure 12 This is a schematic structural diagram of the upper support steel plate disclosed in the present invention;

[0028] Figure 13 It is a structural schematic diagram of the lower support steel plate disclosed in the present invention;

[0029] Figure 14 This is a schematic structural diagram of the upper connecting plate disclosed in the present invention;

[0030] Figure 15 This is a structural schematic diagram of the lower connecting plate disclosed in the present invention;

[0031] Figure 16 Schematic diagram of the structure of the SMA screw disclosed in the present invention;

[0032] Figure 17 This is a schematic structural diagram of the disc spring disclosed in the present invention.

[0033] Figure markings: 1-lead core, 2-rubber isolation pad, 3-lower support steel plate, 31-step hole, 32-first mounting hole, 4-upper support steel plate, 41-convex cone, 42-threaded countersunk hole, 5-self-resetting mechanism, 6-SMA screw, 61-deformation section, 62-threaded section, 7-lateral limiting ring, 71-first circular hole, 72-lateral limiting hole, 8-nut, 9-lower connecting plate, 91-convex ring, 92-concave cone, 93-threaded through hole, 10-upper connecting plate, 101-limiting ring, 102-second mounting hole, 11-disc spring, 12-screw, 13-cavity, 131-second circular hole, 14-extrusion shaft, 141-extrusion section, 142-connecting section, 15-damping material. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto. It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] In the present invention, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe the present invention and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0036] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0037] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0038] Example 1:

[0039] See also Figure 1-Figure 3 This embodiment discloses a three-dimensional seismic isolation support that is resistant to pull-out, including a seismic isolation support, a self-resetting mechanism 5 arranged around the seismic isolation support, and a vertical seismic isolator on the upper portion.

[0040] The seismic isolation support includes a lead core 1 , a rubber seismic isolation pad 2 , an upper support steel plate 4 and a lower support steel plate 3 .

[0041] See also Figure 3The vertical seismic isolator includes a lower connecting plate 9, an upper connecting plate 10, and a squeeze damper. The middle portion of the lower surface of the lower connecting plate 9 is fixedly connected to the middle portion of the upper support steel plate 4. The upper connecting plate 10 is connected to the lower connecting plate via multiple squeeze dampers. This embodiment uses four squeeze dampers.

[0042] See also Figure 3-Figure 4 The self-resetting mechanism 5 includes a limiting rod and a transverse limiting ring 7; several limiting rods are circumferentially fixed on the lower support steel plate 3; the transverse limiting ring 7 is provided with several first circular holes 71 which are slidably connected to the limiting rods, and the transverse limiting ring 7 is located above the upper support steel plate 4; the top end of the limiting rod limits the transverse limiting ring 7, and there is a stretching margin between the top end of the limiting rod and the upper surface of the transverse limiting ring 7, and there is an extrusion margin between the top end of the limiting rod and the lower surface of the lower connecting plate 9.

[0043] For details, see Figure 13 The lower support steel plate 3 is provided with a stepped hole 31 and a first mounting hole 32. The stepped hole 31 is used to connect with the limit rod, and the first mounting hole 32 is used to connect with the lower body. Similarly, the upper connecting plate 10 is also provided with second mounting holes 102 connected to the upper body.

[0044] See also Figure 16 Preferably, the limiting pull rod is an SMA screw rod 6, the middle portion of the SMA screw rod 6 is a deformation section 61, and the two ends are threaded sections 62. Figure 3 , the bottom end of the SMA screw 6 is fixedly mounted on the stepped hole 31 opened on the lower support steel plate 3 by two nuts 8. The first circular hole 71 opened on the transverse limiting ring 7 has the same diameter as the SMA screw 6. The transverse limiting ring 7 can slide up and down on the SMA screw 6. The top of the SMA screw 6 is equipped with a nut 8 for limiting the transverse limiting ring 7. Since the rubber isolation pad 2 should not bear too much tensile force, when the rubber isolation pad 2 is deformed by tension but has not exceeded its vertical tensile stress limit, the transverse limiting ring 7 contacts the nut 8 at the top of the SMA screw 6. At this time, the SMA screw 6 bears the remaining tensile stress, thereby protecting the rubber isolation pad 2 well. Therefore, the distance between the top of the limiting pull rod and the upper surface of the transverse limiting ring 7 is the tensile allowance. Since the limit rod is prone to buckling and instability under pressure, to prevent this, an extrusion margin is left between the top of the limit rod and the lower surface of the lower connecting plate 9. When the seismic isolation bearing is under pressure, the lower connecting plate 9 cannot contact the top of the SMA screw 6, preventing the SMA screw 6 from being compressed. The SMA screw 6 is connected to the first circular hole 71 in the transverse limit ring 7 by a sliding connection, which also ensures that the SMA screw is not compressed during the entire process.

[0045] See also Figure 3 、 Figure 12 、 Figure 15 The connection relationship between the upper support steel plate 4 and the lower connecting plate 9 is as follows: a convex table 41 is provided in the middle of the upper surface of the upper support steel plate 4, and a plurality of threaded countersunk holes 42 are provided on the convex table 41; a convex ring 91 is provided in the middle of the lower surface of the lower connecting plate 9, and a concave table 92 is provided in the middle of the convex ring 91 to engage with the convex table 41, so that it can play a positioning role, and a plurality of threaded through holes 93 are provided on the concave table 92; the upper support steel plate 4 and the lower connecting plate 9 are fixedly connected at the convex table 41 and the concave table 92 by a plurality of screws 12.

[0046] See also Figure 11 The inner circle of the middle part of the transverse limiting ring 7 is a transverse limiting hole 72. Preferably, the overlap length of the transverse limiting ring 7 on the upper support steel plate is greater than d gap The distance between the inner ring of the horizontal limit ring 7 and the convex ring 91 of the lower connecting plate 9 is d gap ; The distance from the outer edge of the upper support steel plate to the limit rod is d gap ; distance d gap Take the horizontal displacement corresponding to the shear strain of 150%-200% of the isolation support. gap When the lateral limit ring 7 contacts the convex ring 91 of the lower connecting plate 9, as the deformation of the isolation support continues to increase, the SMA screw 6 begins to bend, playing the role of lateral limit and reset under the large deformation of the isolation support.

[0047] See also Figures 5-10 The extrusion damper includes a cavity 13, an extrusion shaft 14 and a damping material 15; the cavity 13 is a cylindrical structure, and the extrusion shaft 14 and the damping material 15 are located in the cavity 13. The extrusion shaft 14 includes an extrusion section 141 in the middle and connecting sections 142 at both ends, and the diameter of the extrusion section 141 is larger than the diameter of the connecting section 142. A second circular hole 131 is provided on the upper and lower surfaces of the cavity 13, and its diameter is the same as the diameter of the connecting sections 142 at both ends of the extrusion shaft 14. The height of the extrusion section 141 is smaller than the height of the inner cavity of the cavity 13, and the connecting sections 142 at both ends of the extrusion shaft 14 are slidably arranged in the cavity 13; the bottom of the cavity 13 is connected to the lower connecting plate 9 by welding, and the upper end of the extrusion shaft 14 is connected to the upper connecting plate 10 by welding, screw connection or direct thread connection.

[0048] For further information, see Figure 3 、 Figure 17The extrusion damper also includes a disc spring 11. A plurality of disc springs 11 alternate in positive and negative directions to form a disc spring assembly. The disc spring assembly is sleeved outside the extrusion damper, and the inner diameter of the disc spring 11 is the same as the outer diameter of the cavity 13. A plurality of limiting rings 101 are provided on the lower surface of the upper connecting plate 10. The outer diameter of the cavity 13 is the same as the inner diameter of the limiting ring 101 of the upper connecting plate 10, which is convenient for installation and can also make the pressure borne by the upper connecting plate 10 be evenly transmitted to the disc spring assembly through the limiting ring 101. The two ends of the disc spring assembly are respectively against the lower surface of the limiting ring 101 and the upper surface of the lower connecting plate 9. When the upper connecting plate 10 moves vertically under the action of an earthquake, it compresses the disc spring assembly to play a role in vertical seismic isolation. The middle section of the extrusion shaft 14 and the cavity 13 are filled with lead or oil damping material 15.

[0049] Under the action of vertical earthquake, when the upper connecting plate 10 moves downward together with the extrusion shaft 14, the limiting ring 101 on the upper connecting plate 10 compresses the disc spring assembly, and the extrusion shaft 14 compresses the damping material 15 in the cavity 13, thereby dissipating the earthquake energy and playing a role of seismic isolation; when the upper connecting plate 10 moves vertically upward together with the extrusion shaft 14, the middle extrusion section 141 of the extrusion shaft 14 contacts the top surface of the cavity 13, thereby playing a vertical tensile function.

[0050] Preferably, a certain distance is reserved between the bottom of the extrusion shaft 14 and the lower connecting plate 9, so that when the extrusion shaft 14 moves up and down in the cavity 13, the bottom of the extrusion shaft 14 does not collide with the lower connecting plate; a certain distance is reserved between the top surface of the cavity 13 and the lower surface of the upper connecting plate 10, so that when the upper connecting plate 10 moves downward together with the extrusion shaft 14, the lower surface of the upper connecting plate 10 cannot collide with the top surface of the cavity 13.

[0051] The present invention provides a three-dimensional seismic isolation support with pull-out resistance, which has horizontal and vertical double isolation, vertical pull-out resistance, large deformation lower limit and self-reset function. Vertical seismic isolation relies on disc spring 11 and extrusion damper to achieve the effect of seismic isolation; vertical pull-out resistance is achieved by extrusion damper and self-reset mechanism 5, thereby avoiding overturning of the upper building structure; horizontal seismic isolation is achieved by lead core 1 rubber support. Under the action of small and medium earthquakes and normal use, the seismic isolation support undergoes small horizontal shear deformation to dissipate earthquake energy, and the self-reset mechanism 5 does not play a role. In rare earthquakes, the horizontal shear deformation of the seismic isolation support is greater than the d set by the self-reset mechanism 5. gap The SMA screw 6 in the self-resetting structure begins to bend, limiting the large displacement of the isolation bearing. Furthermore, the superelastic properties of the SMA screw 6 give the isolation bearing excellent self-resetting capabilities, thereby reducing the cost of structural repair or reinforcement and effectively and quickly improving the overall post-earthquake recovery of the structure.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A three-dimensional pull-out-resistant seismic isolation support, comprising a seismic isolation support, wherein the seismic isolation support comprises a lead core, a rubber seismic isolation pad, an upper support steel plate, and a lower support steel plate; characterized in that: It also includes a self-resetting mechanism arranged around the isolation support and a vertical isolator on the upper part; The vertical seismic isolator includes a lower connecting plate, an upper connecting plate and an extrusion damper; the middle portion of the lower surface of the lower connecting plate is fixedly connected to the middle portion of the upper support steel plate, and the upper connecting plate is connected to the lower connecting plate through a plurality of extrusion dampers; The self-resetting mechanism includes a limiting rod and a transverse limiting ring; several of the limiting rods are circumferentially fixed on the lower support steel plate; several first circular holes are provided on the transverse limiting ring that are slidably connected to the limiting rods, and the transverse limiting ring is located above the upper support steel plate; the top end of the limiting rod limits the transverse limiting ring, and there is a stretching margin between the top end of the limiting rod and the upper surface of the transverse limiting ring, and there is an extrusion margin between the top end of the limiting rod and the lower surface of the lower connecting plate.

2. The pull-out resistant three-dimensional seismic isolation bearing according to claim 1, characterized in that: The limiting pull rod is an SMA screw, the middle part of the SMA screw is a deformation section, and the two ends are threaded sections; the bottom end of the SMA screw is fixedly mounted on the lower support steel plate through two nuts, and a nut is installed on the top end for limiting.

3. The pull-out resistant three-dimensional seismic isolation bearing according to claim 1, characterized in that: A convex frustum is provided in the middle of the upper surface of the upper support steel plate; a convex ring is provided in the middle of the lower surface of the lower connecting plate, and a concave frustum is provided in the middle of the convex ring to engage with the convex frustum; the upper support steel plate and the lower connecting plate are fixedly connected at the convex frustum and the concave frustum by multiple screws.

4. The pull-out resistant three-dimensional seismic isolation bearing according to claim 3, characterized in that: The overlap length of the transverse limiting ring on the upper support steel plate is greater than d gap The distance from the inner ring of the horizontal limit ring to the convex ring of the lower connecting plate is d gap ; The distance from the outer edge of the upper support steel plate to the limit rod is d gap ; distance d gap Take the horizontal displacement corresponding to the shear strain of 150%-200% of the isolation bearing.

5. The pull-out resistant three-dimensional seismic isolation bearing according to claim 1, characterized in that: The extrusion damper includes a cavity, an extrusion shaft and a damping material; the extrusion shaft and the damping material are located in the cavity; the extrusion shaft includes an extrusion section in the middle and connecting sections at both ends, and the diameter of the extrusion section is larger than the diameter of the connecting section; a second circular hole is provided on the upper and lower surfaces of the cavity, and its diameter is the same as the diameter of the connecting sections at both ends of the extrusion shaft, the height of the extrusion section is smaller than the height of the cavity inner cavity, and the connecting sections at both ends of the extrusion shaft are slidably arranged in the cavity; the bottom of the cavity is fixedly connected to the lower connecting plate, and the upper end of the extrusion shaft is fixedly connected to the upper connecting plate.

6. The pull-out resistant three-dimensional seismic isolation bearing according to claim 5, characterized in that: It also includes a disc spring, and a plurality of disc springs are alternately formed in positive and negative directions to form a disc spring assembly, and the disc spring assembly is sleeved outside the extrusion damper.

7. The pull-out resistant three-dimensional seismic isolation bearing according to claim 6, characterized in that: A plurality of limiting rings are provided on the lower surface of the upper connecting plate, and the outer diameter of the cavity is the same as the inner diameter of the limiting rings of the upper connecting plate; the two ends of the disc spring assembly respectively abut against the lower surface of the limiting rings and the upper surface of the lower connecting plate.

8. The pull-out resistant three-dimensional seismic isolation bearing according to claim 5, characterized in that: A certain distance is reserved between the bottom of the extrusion shaft and the lower connecting plate. When the extrusion shaft moves up and down in the cavity, the bottom of the extrusion shaft does not collide with the lower connecting plate. A certain distance is reserved between the top surface of the cavity and the lower surface of the upper connecting plate. When the upper connecting plate moves downward together with the extrusion shaft, the lower surface of the upper connecting plate cannot collide with the top surface of the cavity.

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