Novel vibration double-control support with quasi-constant frequency characteristic

Abstract

The utility model relates to the technical field of civil engineering structure vibration control, in particular to a novel vibration double-control support with quasi-constant frequency characteristic, which comprises an upper connecting plate, a middle connecting plate and a lower connecting plate, one of a variable pitch spring or a rubber vibration isolation support is arranged between the upper connecting plate and the lower connecting plate, and the other one of the variable pitch spring and the rubber vibration isolation support is arranged between the middle connecting plate and the lower connecting plate. One of a variable pitch spring and a rubber vibration isolation support is arranged between the middle connecting plate and the lower connecting plate, the other one of the variable pitch spring and the rubber vibration isolation support is arranged between the middle connecting plate and the lower connecting plate, the rubber vibration isolation support and the variable pitch spring are connected in series, the rubber vibration isolation support provides horizontal vibration isolation performance, and the variable pitch spring provides vertical vibration isolation performance. The vibration isolation system has the advantages that when targets to be subjected to vibration isolation have different weights, the vertical natural vibration frequency of the vibration isolation system is basically constant, and the good quasi-constant frequency characteristic is reflected; the device has remarkable innovation and application potential in the aspect of vibration control.

Description

Technical Field

[0001] This utility model relates to the field of vibration control technology for civil engineering structures, specifically to a novel vibration-controlled support with quasi-constant frequency characteristics. Background Technology

[0002] Vertical vibration isolation bearings are widely used in civil engineering, including thick-layer rubber bearings, cylindrical helical spring bearings, quasi-zero stiffness vibration isolation bearings, and acoustic damping vibration isolation bearings. Thick-layer rubber bearings achieve lower stiffness by thickening the rubber layer in ordinary rubber vibration isolation bearings, enabling vertical vibration isolation. However, this type of bearing has reduced load-bearing capacity and poses potential durability and reliability risks. Quasi-zero stiffness vibration isolation bearings directly utilize disc springs, and with proper design, a zero-stiffness range exists during compression. Due to their low stiffness, quasi-zero stiffness vibration isolation bearings achieve excellent vibration isolation effects. However, the quasi-zero stiffness range only exists within a specific load range, making it difficult to adjust the load above quasi-zero stiffness bearings in civil engineering. If the load above the bearing is not within the quasi-zero stiffness range after construction, its vibration isolation performance cannot be fully realized. Acoustic damping vibration isolation bearings achieve a low dynamic stiffness coefficient by applying acoustic damping materials and, by completely isolating sound bridges, possess good vibration isolation effects.

[0003] However, in actual vertical vibration isolation projects, in addition to considering the fundamental factor of vibration isolation performance, there are other influencing factors that need to be considered, such as vertical eccentricity and the reliability of vibration isolation performance. However, considering these two points in the above-mentioned types of supports is quite complicated and not conducive to implementation. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a novel vibration-controlled bearing with quasi-constant frequency characteristics, exhibiting superior control over vertical eccentricity and vibration isolation reliability. In this novel vibration-controlled bearing, during vertical compression, the vertical pressure and vertical tangential stiffness are essentially positively correlated. For a vertical vibration isolation system composed of multiple such bearings, this means the structural center of mass and vertical center of stiffness are essentially aligned, thus allowing for better control of vertical eccentricity. Furthermore, due to its quasi-constant frequency characteristics, the structure's vertical natural frequency remains consistent even when the vertical load varies within a certain range. This ensures that the frequency characteristics of the vibration-isolated structure after construction match expectations, guaranteeing the reliability of its vibration isolation effect.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A novel vibration-controlled support with quasi-constant frequency characteristics is characterized by comprising an upper connecting plate, a middle connecting plate, and a lower connecting plate. A variable pitch spring or a rubber vibration isolation support is disposed between the upper connecting plate and the lower connecting plate, and the other variable pitch spring or rubber vibration isolation support is disposed between the middle connecting plate and the lower connecting plate. The rubber vibration isolation support and the variable pitch spring are connected in series. The rubber vibration isolation support provides horizontal vibration isolation performance, and the variable pitch spring provides vertical vibration isolation performance.

[0007] The vertical tangential stiffness of the variable pitch spring increases with the increase of deformation after being compressed, and the increase ratio is comparable to the increase ratio of the compressive load.

[0008] A plurality of variable pitch springs are arranged at intervals between the upper connecting plate and the middle connecting plate, and the plurality of variable pitch springs are arranged symmetrically about the center line of the upper connecting plate and the middle connecting plate.

[0009] A rubber protective layer is provided between the upper connecting plate and the middle connecting plate, and the rubber protective layer is arranged around the variable pitch spring.

[0010] The variable pitch spring is sleeved on a vertical bearing, and the end of the vertical bearing is provided with an external thread that matches the wire diameter of the variable pitch spring.

[0011] The rubber vibration isolation bearing includes a rubber layer, a laminated steel plate, and a lead core. The upper and lower ends of the lead core are respectively embedded and connected to the middle connecting plate and the lower connecting plate. The laminated steel plate is disposed around the lead core and located between the middle connecting plate and the lower connecting plate. The rubber layer is disposed between the layers of the laminated steel plate.

[0012] A rubber protective layer is provided between the middle connecting plate and the lower connecting plate, and the rubber protective layer is arranged around the rubber layer and the laminated steel plate.

[0013] The advantages of this utility model are:

[0014] 1) The vertical stiffness of the vibration-controlled support in this utility model is basically positively correlated with the vertical load it bears. In the vibration isolation layer composed of this support, the structural centroid and the vertical stiffness center are close to each other, and it has excellent stiffness center self-adaptability.

[0015] 2) The vibration dual-control support in this utility model has quasi-constant frequency characteristics. When the weight of the target to be isolated is different, it still has a basically consistent vertical natural frequency, which can ensure that the vibration isolation system after the actual construction is completed is consistent with the design scheme, the vibration isolation effect is more in line with expectations, and the reliability of the vibration isolation performance is ensured.

[0016] 3) The vibration dual-control support in this utility model is applicable to various vibration control scenarios in civil engineering, mainly including comfort control of subway overpasses, etc. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 The optimized load-displacement curve and stiffness-deformation curve of the variable pitch spring provided by this utility model;

[0019] Figure 3 The typical vertical frequency-load curve provided by this utility model. Detailed Implementation

[0020] The features of this utility model and other related features will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate the understanding of those skilled in the art:

[0021] like Figure 1-3 As shown in the figure, the markings 1-10 represent: upper connecting plate 1, rubber protective layer 2, variable pitch spring 3, bearing 4, middle connecting plate 5, rubber layer 6, laminated steel plate 7, rubber protective layer 8, lower connecting plate 9, and lead core 10, respectively.

[0022] Example: Figure 1 As shown, the novel vibration-controlled support with quasi-constant frequency characteristics in this embodiment includes a rubber vibration isolation support, a variable pitch spring 3, and an upper connecting plate 1.

[0023] The rubber vibration isolation bearing consists of a middle connecting plate 5, a rubber layer 6, a laminated steel plate 7, a rubber protective layer 8, a lower connecting plate 9, and a lead core 10. The upper and lower ends of the lead core 10 are embedded and connected to the middle connecting plate 5 and the lower connecting plate 9, respectively. The laminated steel plate 7 is located around the lead core 10 and between the middle connecting plate 5 and the lower connecting plate 9. The rubber layer 6 is located between the layers of the laminated steel plate 7, and the rubber protective layer 8 is arranged around the rubber layer 6 and the laminated steel plate 7.

[0024] The rubber vibration isolation bearing and the variable pitch spring 3 are connected in series. The rubber vibration isolation bearing has a large vertical stiffness and a small horizontal stiffness, and only provides horizontal vibration isolation performance. The horizontal degree of freedom of the variable pitch spring 3 is constrained by the vertical bearing 4, and only provides vertical vibration isolation performance.

[0025] The variable pitch spring with a 3-pitch design is optimized to ensure that the vertical vibration isolation system exhibits a certain degree of stiffness hardening characteristics as the vertical compressive load increases, so that the stiffness hardening amplitude is comparable to the load increase amplitude. Figure 2 As shown. Specifically, its restoring force model should satisfy the following hyperbolic sine function form:

[0026] ;

[0027] In the formula, x It is a vertical compression deformation. F For vertical restoring force, For quasi-constant frequency coefficients, This represents the load amplitude. The vertical frequency response of the system is determined by parameters. reflect.

[0028] The end of the vertical bearing 4 is provided with an external thread matching the wire diameter of the variable pitch spring 3. The variable pitch spring 3 is fixed between the upper connecting plate 1 and the middle connecting plate 5 and can withstand a certain tensile force. The damping coefficient of the vertical vibration isolation system can be adjusted in the vertical bearing 4 according to actual needs. The rubber protective layer 2 is arranged around the variable pitch spring 3 and can provide a certain damping ratio.

[0029] In this embodiment, a plurality of variable pitch springs 3 are arranged at intervals between the upper connecting plate 1 and the middle connecting plate 5, and the plurality of variable pitch springs 3 are symmetrically arranged at the centerline positions of the upper connecting plate 1 and the middle connecting plate 5 to ensure uniform vertical vibration isolation performance.

[0030] The working process of this embodiment is as follows:

[0031] The vibration-controlled support is connected to adjacent structural components via an upper connecting plate 1 and a lower connecting plate 9, which can be achieved through embedded parts or welding. The vertical load transmitted from the upper structure is borne by the rubber vibration isolation support and the variable pitch spring 3 connected in series. The vertical internal forces on the rubber vibration isolation support and the variable pitch spring 3 are basically the same.

[0032] Under horizontal seismic action, the variable pitch spring 3 is restricted by the vertical bearing 4 and does not undergo horizontal deformation. Only the rubber vibration isolation support undergoes horizontal deformation to dissipate energy, but at this time the variable pitch spring 3 is not subjected to horizontal shear force.

[0033] Combination Figure 2 and Figure 3 As shown, under vertical vibration, the rubber vibration isolation bearing has a large vertical stiffness and basically does not deform. Vertical deformation occurs at the variable pitch spring 3, and the vertical compressive load and vertical deformation basically satisfy a hyperbolic sine function. As the vertical compressive load increases, the vertical stiffness of the variable pitch spring 3 exhibits hardening characteristics. During compression, the vertical bearing 4 undergoes the same deformation, which can be designed to provide a certain vertical damping ratio.

[0034] In this embodiment, the variable pitch spring 3 can be positioned at the top of the rubber vibration isolation support or at the bottom of the rubber vibration isolation support.

[0035] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A novel vibration-controlled support with quasi-constant frequency characteristics, characterized in that: The device includes an upper connecting plate, a middle connecting plate, and a lower connecting plate. A variable pitch spring or a rubber vibration isolation support is disposed between the upper connecting plate and the lower connecting plate, and the other variable pitch spring or rubber vibration isolation support is disposed between the middle connecting plate and the lower connecting plate. The rubber vibration isolation support and the variable pitch spring are connected in series. The rubber vibration isolation support provides horizontal vibration isolation performance, and the variable pitch spring provides vertical vibration isolation performance.

2. The novel vibration dual-control support with quasi-constant frequency characteristics according to claim 1, characterized in that: The vertical tangential stiffness of the variable pitch spring increases with the increase of deformation after being compressed, and the increase ratio is comparable to the increase ratio of the compressive load.

3. The new type of vibration isolation double-controlled support with quasi-constant frequency characteristics according to claim 1, characterized in that: A plurality of variable pitch springs are arranged at intervals between the upper connecting plate and the middle connecting plate, and the plurality of variable pitch springs are arranged symmetrically about the center line of the upper connecting plate and the middle connecting plate.

4. A novel vibration-controlled support with quasi-constant frequency characteristics according to claim 1, characterized in that: A rubber protective layer is provided between the upper connecting plate and the middle connecting plate, and the rubber protective layer is arranged around the variable pitch spring.

5. A novel vibration-controlled support with quasi-constant frequency characteristics according to claim 1, characterized in that: The variable pitch spring is sleeved on a vertical bearing, and the end of the vertical bearing is provided with an external thread that matches the wire diameter of the variable pitch spring.

6. The new type of seismic double-controlled support with quasi-constant frequency characteristics according to claim 1, characterized in that: The rubber vibration isolation bearing includes a rubber layer, a laminated steel plate, and a lead core. The upper and lower ends of the lead core are respectively embedded and connected to the middle connecting plate and the lower connecting plate. The laminated steel plate is disposed around the lead core and located between the middle connecting plate and the lower connecting plate. The rubber layer is disposed between the layers of the laminated steel plate.

7. The new type of seismic double-controlled support with quasi-constant frequency characteristics according to claim 6, characterized in that: A rubber protective layer is provided between the middle connecting plate and the lower connecting plate, and the rubber protective layer is arranged around the rubber layer and the laminated steel plate.

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