A three-dimensional seismic isolation device

Abstract

This invention provides a novel three-dimensional seismic isolation device, comprising an upper connecting steel plate, a connecting plate, a lower connecting steel plate, a molecular spring assembly disposed between the upper connecting steel plate and the connecting plate, and a lead-core rubber assembly disposed between the connecting plate and the lower connecting steel plate for horizontal seismic isolation. The molecular spring assembly includes an annular groove connected to the connecting plate, and an annular pressure plate adapted to the annular groove is disposed at the bottom of the upper connecting steel plate. In the assembled state, the annular pressure plate is inserted into the annular groove, which is filled with viscous liquid and molecular sieve material. In response to the load on the molecular spring assembly exceeding a critical value, the viscous liquid enters the micropores of the molecular sieve material, providing suitable vertical seismic isolation stiffness and vertical damping. This embodiment, through the "high-low-high" three-stage stiffness of the molecular spring assembly, can meet the requirements of high load-bearing capacity and low seismic isolation stiffness of three-dimensional seismic isolation bearings.

Description

Technical Field

[0001] This invention relates to the field of seismic isolation technology, and in particular to a novel three-dimensional seismic isolation device. Background Technology

[0002] Three-dimensional seismic isolation devices can provide seismic isolation in both horizontal and vertical directions. Through years of effort, scholars both domestically and internationally have achieved significant research results, developing three-dimensional seismic isolation devices such as disc spring-single friction pendulum three-dimensional seismic isolation devices and oblique three-dimensional seismic isolation supports.

[0003] Combination Figure 1 The disc spring-single friction pendulum three-dimensional vibration isolation device is described. Figure 1 This is a schematic diagram of a disc spring-single friction pendulum three-dimensional vibration isolation device. Figure 1 As shown, the device consists of two parts: an upper vertical isolation unit composed of disc springs, which is made up of multiple rows of centrally symmetrical disc springs; and a lower horizontal isolation unit connected in series with a single friction pendulum. Horizontal isolation is achieved by the single friction pendulum unit, while vertical isolation is achieved by the disc spring unit. However, the relatively low vertical stiffness of this three-dimensional isolation device results in significant pre-stress deformation under the self-weight of the superstructure, failing to adequately meet the stiffness requirements of the structure under static loads.

[0004] Next, combine Figure 2 The three-dimensional seismic isolation bearing with oblique sliding type is explained. Figure 2 This is a structural schematic diagram of a three-dimensional seismic isolation bearing with oblique sliding. (See attached diagram.) Figure 2 As shown, this support mainly consists of an upper lead-core rubber bearing for horizontal seismic isolation, a middle sliding connector and sliding friction block, and a lower lead-core rubber bearing for vertical seismic isolation. By tilting the lead-core rubber bearings, the vertical deformation of the structure is converted into compressive-shear deformation of the lower support and frictional sliding of the friction block, achieving both vertical deformation and seismic isolation. The vertical seismic isolation effect of this three-dimensional seismic isolation support is determined by the shear stiffness and compressive stiffness of the lower inclined lead-core rubber bearing. However, after the lead-core rubber bearings are tilted, the creep problem of the rubber bearings under compressive-shear deformation is quite prominent, causing the deformation of the lower inclined lead-core rubber bearings under seismic loading to be uncoordinated, resulting in the device's ineffective performance. Summary of the Invention

[0005] The summary section of this invention provides a brief overview of the concepts, which will be described in detail in the detailed description section that follows. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] Some embodiments of the present invention provide a novel three-dimensional seismic isolation device to solve the technical problems mentioned in the background section above.

[0007] This novel three-dimensional vibration isolation device includes an upper connecting steel plate, a connecting plate, a lower connecting steel plate, a molecular spring assembly disposed between the upper connecting steel plate and the connecting plate, and a lead-core rubber assembly disposed between the connecting plate and the lower connecting steel plate for horizontal vibration isolation. The molecular spring assembly includes an annular groove connected to the connecting plate. An annular pressure plate adapted to the annular groove is disposed at the bottom of the upper connecting steel plate. In the assembled state, the annular pressure plate is inserted into the annular groove, which is filled with a viscous liquid and molecular sieve material. In a static state, the viscous liquid provides high vertical load-bearing stiffness. In response to the load on the molecular spring assembly exceeding a critical value, the viscous liquid enters the micropores of the molecular sieve material, providing suitable low vertical vibration isolation stiffness and vertical damping. In response to the viscous liquid penetrating the molecular sieve material to saturation, it provides high vertical load-bearing stiffness to limit vertical displacement.

[0008] Optionally, the novel three-dimensional vibration isolation device further includes a pull-out resistance mechanism, which includes a connecting ring, a connecting ring baffle, and an annular groove baffle. The upper end of the connecting ring is fixedly connected to the upper connecting steel plate, the connecting ring baffle is engaged with the inner wall of the lower end of the connecting ring, and the annular groove baffle is fitted onto the outer wall of the annular groove. In a static state, the lower end face of the annular groove baffle is engaged with the upper end face of the connecting ring baffle.

[0009] Optionally, in the static state, a gap is provided between the upper connecting steel plate and the annular groove.

[0010] Optionally, a molecular spring upper sealing plate is provided on the annular groove, and in the static state, the annular pressure plate is engaged with the molecular spring upper sealing plate.

[0011] Optionally, the lead core rubber assembly includes a lead core arranged vertically, a plurality of alternately stacked rubber layers, and a steel plate, wherein the steel plate and the rubber layers are fitted onto the lead core.

[0012] Optionally, the lead-core rubber assembly is provided with an upper sealing plate and a lower sealing plate at its upper and lower ends. In a static state, the upper sealing plate is engaged with the connecting plate, and the lower sealing plate is engaged with the lower connecting steel plate.

[0013] Optionally, the lead-core rubber assembly further includes a rubber protective layer that wraps around the rubber layer, the upper sealing plate, and the lower sealing plate.

[0014] Optionally, the upper connecting steel plate is connected to the upper support pier by bolts.

[0015] Optionally, the lower connecting steel plate is connected to the lower support pier by bolts.

[0016] Optionally, the viscous liquid is silicone oil, and the molecular sieve material is zeolite.

[0017] The above embodiments of the present invention have the following beneficial effects: A novel three-dimensional seismic isolation device of the present invention includes a lead-core rubber assembly and a molecular spring assembly. The lead-core rubber assembly possesses energy dissipation performance under horizontal seismic loading, extending the natural period of the structure in the horizontal direction. Furthermore, the lead-core rubber assembly can provide the necessary yield strength and stiffness under static loads, exhibiting high initial vertical stiffness under lower horizontal forces.

[0018] The aforementioned molecular spring assembly comprises a viscous liquid and a molecular sieve material. In a static state, the viscous liquid is compressed, providing high vertical load-bearing stiffness.

[0019] Under vertical seismic loading, the viscous fluid in the molecular spring assembly experiences a load exceeding a critical value, causing it to penetrate the micropores of the molecular sieve material. This process of viscous fluid intrusion into the micropores of the molecular spring assembly not only generates damping but also induces a low-stiffness phase, effectively extending the structure's natural vibration period and achieving both seismic isolation and vertical damping functions.

[0020] Finally, when the intensity of a vertical earthquake causes the viscous liquid to fill the micropores of the molecular sieve, the molecular spring assembly exhibits high stiffness. This high stiffness results in high load-bearing capacity, which serves as a limiting protection mechanism for the seismic isolation device.

[0021] In this way, the aforementioned molecular spring assembly has three stiffness levels: "high-low-high". This variable stiffness meets the requirements of high load-bearing capacity and low isolation stiffness of the three-dimensional seismic isolation bearing. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a disc spring-single friction pendulum three-dimensional vibration isolation device;

[0024] Figure 2 A schematic diagram of a three-dimensional seismic isolation bearing with oblique sliding type;

[0025] Figure 3 This is a schematic diagram of the structure of one embodiment of a novel three-dimensional vibration isolation device according to the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1: Upper connecting steel plate; 11: Annular pressure plate; 12: Connecting ring; 13: Connecting ring baffle; 2: Connecting plate; 21: Annular groove; 22: Annular groove baffle; 23: Upper sealing plate of molecular spring; 3: Lower connecting steel plate; 41: Upper sealing plate; 42: Steel plate; 43: Lead core; 44: Lower sealing plate; 45: Rubber protective layer; 5: Upper support; 6: Lower support. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Please see Figure 3 , Figure 3 This is a structural schematic diagram of one embodiment of a novel three-dimensional vibration isolation device according to the present invention. Figure 3As shown, the device includes an upper connecting steel plate 1, a connecting plate 2, a lower connecting steel plate 3, a molecular spring assembly, and a lead-core rubber assembly. The upper connecting steel plate 1 and the lower connecting steel plate 3 are respectively bolted to the upper support 5 and the lower support 6.

[0033] In some embodiments, the molecular spring assembly is disposed between the upper connecting steel plate 1 and the connecting plate 2 for vertical vibration isolation and to provide vertical damping. Specifically, the molecular spring assembly includes an annular groove 21 connected to the connecting plate 2. An annular pressure plate 11 adapted to the annular groove 21 is provided at the bottom of the upper connecting steel plate 1. The annular groove 21 is filled with viscous liquid and molecular sieve material. Further, a molecular spring upper sealing plate 23 is also provided on the annular groove 21 to prevent viscous liquid leakage. In the assembled state, the annular pressure plate 11 is inserted into the annular groove 21 and engages with the molecular spring upper sealing plate 23.

[0034] It should be noted that when the load on the viscous fluid exceeds a critical value, it will penetrate into the micropores of the molecular sieve material. During the decompression phase, the viscous fluid will overflow from the micropores. Energy storage and release can be achieved during the process of a large amount of viscous fluid entering and exiting the micropores. Furthermore, the aforementioned viscous fluid also produces a damping effect.

[0035] Therefore, when at rest, the aforementioned viscous fluid is compressed, providing high vertical bearing stiffness to withstand the load of the upper support.

[0036] Under vertical seismic loading, the viscous fluid in the molecular spring assembly experiences a load exceeding a critical value, causing it to penetrate the micropores of the molecular sieve material. This process of viscous fluid intrusion into the micropores of the molecular spring assembly not only generates damping but also induces a low-stiffness phase, effectively extending the structure's natural vibration period and achieving both seismic isolation and vertical damping functions.

[0037] When the intensity of a vertical earthquake causes the viscous liquid to fill the micropores of the molecular sieve, the micropores become saturated. At this point, under external load, the viscous liquid is compressed, and the molecular spring assembly exhibits high stiffness. The high load-bearing capacity resulting from this high stiffness can limit the vertical displacement of the molecular spring assembly, thus providing a limiting protection mechanism for the seismic isolation device.

[0038] In this way, the aforementioned molecular spring assembly has three stiffness levels: "high-low-high". This variable stiffness meets the requirements of high load-bearing capacity and low isolation stiffness of the three-dimensional seismic isolation bearing.

[0039] It should be noted that the above critical value can be determined using the following formula:

[0040] ;

[0041] in This is the critical value characterized by the critical pressure.

[0042] The surface tension of the liquid;

[0043] The solid-liquid contact angle;

[0044] denoted as the radius of the hydrophobic micropore.

[0045] During the process of viscous liquid penetrating the micropores of the molecular sieve material until saturation, the molecular spring assembly enters a low-stiffness state, and the level of stiffness is related to the amount of viscous liquid penetrating the micropores.

[0046] Furthermore, after determining the viscous liquid and the molecular sieve material, the critical value for the aforementioned critical pressure characterization can be determined. Therefore, by changing the area of ​​the annular groove 21, the bearing pressure of the viscous liquid can be determined as the critical value for the viscous liquid to penetrate the micropores of the molecular sieve material, thereby meeting the stiffness requirements of the molecular spring assembly under static load.

[0047] It should be noted that the aforementioned viscous liquid can be silicone oil, hydraulic oil, or a suspension. The molecular sieve material can be zeolite or silica gel particles. Those skilled in the art can determine the aforementioned viscous liquid and molecular sieve material based on common knowledge or existing technology.

[0048] Furthermore, the novel three-dimensional vibration isolation device also includes a pull-out resistance mechanism, which comprises a connecting ring 12, a connecting ring baffle 13, and an annular groove baffle 22. The upper end of the connecting ring 12 ( Figure 3 The connecting ring 12 (in the direction of the ring) is fixedly connected to the upper connecting steel plate 1. The connecting ring baffle 13 is engaged with the inner wall of the lower end of the connecting ring 12, and the annular groove baffle 22 is fitted onto the outer wall of the annular groove 21. In the static state, the lower end face of the annular groove baffle 22 is engaged with the upper end face of the connecting ring baffle 13. In this way, the connecting ring baffle 13 is engaged below the annular groove baffle 22, which can prevent the annular groove 21 from detaching from the annular pressure plate 11, thus improving the reliability of the vibration isolation device. The connecting ring 12 and the connecting ring baffle 13 can be integrally manufactured. The annular groove 21 can also be integrally manufactured with the annular groove baffle 22. In order to provide compression space for the annular pressure plate 11 to compress the molecular spring assembly, the upper connecting steel plate 1 is provided with a gap between it and the upper end face of the annular groove 21.

[0049] The aforementioned lead-core rubber assembly is disposed between the connecting plate 2 and the lower connecting steel plate 3 for horizontal vibration isolation. Specifically, the lead-core rubber assembly includes a vertically arranged lead core 43, multiple rubber layers, and a steel plate 42. The rubber layers and steel plates are alternately stacked. The steel plate 42 and the rubber layers are vulcanized to connect them and then fitted onto the lead core 43. An upper sealing plate 41 and a lower sealing plate 44 are also provided at the upper and lower ends of the lead-core rubber assembly. In a static state, the upper sealing plate 41 is engaged with the connecting plate 2, and the lower sealing plate 44 is engaged with the lower connecting steel plate 3. The lead-core rubber assembly also includes a rubber protective layer 45 to protect the steel plate from corrosion; the rubber protective layer 45 encloses the rubber layers, the upper sealing plate 41, the lower sealing plate 44, and the steel plate 42.

[0050] The aforementioned lead core can absorb energy through plastic deformation when the rubber layer is sheared and deformed. After the earthquake, it can automatically return to its original position through dynamic recovery and recrystallization processes and the shear tension of the rubber layer, thereby limiting horizontal displacement.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A three-dimensional seismic isolation device, characterized by, It includes an upper connecting steel plate, a connecting plate, a lower connecting steel plate, a molecular spring assembly disposed between the upper connecting steel plate and the connecting plate, and a lead-core rubber assembly disposed between the connecting plate and the lower connecting steel plate for horizontal vibration isolation, wherein, The molecular spring assembly includes an annular groove connected to the connecting plate. The bottom of the upper connecting steel plate is provided with an annular pressure plate adapted to the annular groove. In the assembled state, the annular pressure plate is inserted into the annular groove, which is filled with viscous liquid and molecular sieve material. In a static state, the viscous fluid provides high vertical load-bearing stiffness; In response to the load on the molecular spring assembly exceeding a critical value, the viscous liquid enters the micropores of the molecular sieve material, providing suitable low vertical vibration isolation stiffness and vertical damping. In response to the viscous liquid penetrating the molecular sieve material to saturation, it can provide high vertical load-bearing stiffness to limit the amount of vertical displacement; The viscous liquid is silicone oil, and the molecular sieve material is zeolite; The bearing pressure of the viscous liquid is determined as the critical value for the viscous liquid to penetrate the micropores of the molecular sieve material by changing the area of ​​the annular groove.

2. The three-dimensional vibration isolation device according to claim 1, characterized in that, The three-dimensional vibration isolation device also includes a pull-out mechanism, which includes a connecting ring, a connecting ring baffle, and an annular groove baffle. The upper end of the connecting ring is fixedly connected to the upper connecting steel plate. The connecting ring baffle is engaged with the inner wall of the lower end of the connecting ring. The annular groove baffle is fitted onto the outer wall of the annular groove. In a static state, the lower end face of the annular groove baffle is engaged with the upper end face of the connecting ring baffle.

3. A three-dimensional seismic isolation device according to claim 2, wherein When stationary, a gap is provided between the upper connecting steel plate and the annular groove.

4. A three-dimensional seismic isolation device according to claim 3, wherein A molecular spring upper sealing plate is provided on the annular groove. In the static state, the annular pressure plate is engaged with the molecular spring upper sealing plate.

5. The three-dimensional isolation device of claim 1, wherein The lead core rubber assembly includes a lead core arranged vertically, multiple rubber layers stacked alternately, and a steel plate, wherein the steel plate and the rubber layers are fitted onto the lead core.

6. A three-dimensional vibration isolation device according to claim 5, characterized in that, The lead-core rubber assembly is provided with an upper sealing plate and a lower sealing plate at its upper and lower ends. In the static state, the upper sealing plate is engaged with the connecting plate, and the lower sealing plate is engaged with the lower connecting steel plate.

7. A three-dimensional seismic isolation device according to claim 6, wherein The lead-core rubber assembly also includes a rubber protective layer, which wraps around the rubber layer, the upper sealing plate, and the lower sealing plate.

8. A three-dimensional seismic isolation device according to claim 7, wherein The upper connecting steel plate is connected to the upper support pier by bolts.

9. The three-dimensional isolation device of claim 7, wherein, The lower connecting steel plate is connected to the lower support pier by bolts.

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