CN201292579Y - Stiffness changing composite lead core rubber support shock isolator - Google Patents

Abstract

The utility model relates to a rigidity-variable compound vibration isolator of a lead-core rubber support base, which can be used for the vibration isolating control of a construction structure. The rigidity-variable compound vibration isolator of a lead-core rubber support base comprises a lower connection board, a lower lead-core rubber support base, a middle connection board, an upper lead-core rubber support base, an upper connection board and a spacing steel cylinder, wherein the lower lead-core rubber support base and the upper lead-core rubber support base are connected in series by the middle connection board, the lower end of the lower lead-core rubber support base is fixedly connected with the lower connection board, the upper end of the upper lead-core rubber support base is fixedly connected with the upper connection board, the spacing steel cylinder is sleeved outside the upper lead-core rubber support base, the lower end of the spacing steel cylinder is fixedly connected with the middle connection board, and the spacing steel cylinder is used for limiting the oversize deformation of the upper lead-core rubber support base. After the deformation of the upper lead-core rubber support base is limited by the spacing steel cylinder, the deformation of the vibration isolator is born by the lower lead-core rubber support base to realize the rigidity variation.

Description

Variable Stiffness Composite Lead Core Rubber Bearing Shock Isolator

technical field

The utility model relates to a vibration isolator, in particular to a vibration isolator with variable stiffness composite lead rubber bearing, which can be applied to the vibration isolation control of engineering structures.

Background technique

The lead rubber bearing isolator is a device used to reduce the magnitude of the vibration of the superstructure due to the horizontal movement of the foundation. Conventional lead rubber bearing shock isolators are shown in Figure 1 and Figure 2. This type of lead core rubber bearing vibration isolator includes a lower connecting plate, laminated rubber, laminated steel plates, lead core and an upper connecting plate. When in use, the upper structure is fixed on the upper connection plate, and the lower connection plate is fixed on the foundation. The conventional lead rubber bearing shock isolator shown in Figure 1 has two disadvantages: (1) For buildings with a low number of floors, in order to ensure that the shock isolator has sufficient deformation capacity, it needs to use a relatively large diameter and height, Such a shock isolator is expensive, but the bearing capacity is sufficient; and if a smaller size shock isolator is used, the deformation capacity under a large earthquake is not enough; (2) The shock isolator with a relatively small deformation capacity is not suitable for large deformation The protection measures of the shock isolator designed according to frequent earthquakes may cause excessive deformation under the action of rare earthquakes, resulting in damage to the shock isolator and further damage to the engineering structure.

Contents of the invention

The purpose of this utility model is to propose a composite lead rubber with the function of variable stiffness in view of the problems that the existing lead rubber bearing shock isolator has poor adaptability to bearing capacity and deformation capacity, and has no protection measures for large deformation. The support isolator, which can better coordinate the contradiction between the bearing capacity and the deformation capacity when the number of floors of the building is not very high.

In order to achieve the above object, the design scheme of the present utility model is as follows:

The shock isolator with variable stiffness composite lead rubber bearing includes a lower connecting plate, a lower lead rubber bearing, a middle connecting plate, an upper lead rubber bearing, an upper connecting plate, and a limit steel cylinder. The lower lead rubber bearing and the upper lead rubber bearing are connected in series through the middle connecting plate; the lower end of the lower lead rubber bearing is consolidated with the lower connecting plate, and the upper end of the upper lead rubber bearing is consolidated with the upper connecting plate; The diameter of the lead rubber bearing is larger than the diameter of the upper lead rubber bearing, and the horizontal deformation stiffness of the lower lead rubber bearing is greater than that of the upper lead rubber bearing; the limit steel cylinder is set on the upper lead rubber bearing. Outside the seat, its lower end is consolidated with the middle connecting plate, and the outer side of the limiting steel cylinder is flush with the outer edge of the middle connecting plate. The bottom ends are flush; there is a deformation space between the limit steel cylinder and the upper connecting plate. The limiting steel cylinder is used to limit the excessive deformation of the upper lead rubber bearing. When the deformation of the upper lead rubber bearing is limited by the limit steel cylinder, the deformation of the shock isolator will be borne by the lower lead rubber bearing.

In the utility model, two lead rubber bearings with different diameters are vertically connected in series. Since the horizontal deformation stiffness of the upper lead rubber bearing is smaller than that of the lower lead rubber bearing, when the upper connecting plate is opposite When the lower connecting plate has a small horizontal relative movement, the horizontal deformation mainly occurs in the upper lead rubber bearing. When the upper connecting plate is in contact with the limit steel cylinder, the deformation of the upper lead rubber bearing no longer increases. Thereafter, the horizontal deformation between the upper connecting plate and the lower connecting plate will be mainly borne by the lower lead rubber bearing. Therefore, when the upper connecting plate is in contact with the limit steel cylinder, the horizontal stiffness of the shock isolator with variable stiffness composite lead rubber bearing will become larger, thereby preventing excessive deformation of the shock isolator.

Description of drawings:

Fig. 1 Schematic diagram of conventional lead rubber bearing shock isolator.

Fig. 2 A-a sectional view of conventional lead rubber bearing shock isolator.

Fig. 3 is a schematic diagram of the vibration isolator with variable stiffness composite lead rubber bearing proposed by the utility model.

Fig. 4 is a sectional view b-b of the vibration isolator with variable stiffness composite lead rubber bearing proposed by the utility model.

Fig. 5 is the application form of the vibration isolator with variable stiffness composite lead rubber bearing in the embodiment of the utility model.

Figure 6 shows the deformation state of the lead rubber bearing before it is limited.

Figure 7 shows the deformation state of the upper lead rubber bearing after being limited.

In the figure: 1. Lower connection plate, 2. Laminated rubber, 3. Laminated steel plate, 4. Lead stem, 5. Upper connection plate, 6. Lower connection plate, 7. Lower lead core rubber support, 8. Middle connection plate, 9. Upper lead rubber bearing, 10. Upper connection plate, 11. Limiting steel cylinder, 12. Building foundation, 13. Building superstructure, 14. Soil around the building.

Detailed ways

Below in conjunction with embodiment the utility model is described further.

Figure 5 is a schematic diagram of the structure of a seismically isolated building using variable stiffness composite lead rubber bearing isolators, and the structure of the isolator is shown in Figure 3. The shock isolator with variable stiffness composite lead rubber bearing is a series system composed of an upper lead rubber bearing 9 and a lower lead rubber bearing 7 . The upper connecting plate 10 of the shock isolator is consolidated with the bottom column foot of the building superstructure 13, and the lower connecting plate 6 is consolidated with the building foundation 12. There is a deformation space between the shock isolator and the surrounding soil 14 of the building. Figures 6 and 7 show the working mechanism of the variable stiffness composite lead rubber bearing. Figure 6 shows that when a small deformation occurs, the deformation of the shock isolator is mainly concentrated at the upper lead rubber bearing 9; Figure 7 shows that after the upper lead rubber bearing 9 reaches the predetermined maximum deformation, that is, the upper connecting plate 10 After contacting the inward protrusion on the upper edge of the limit steel cylinder 11, the deformation will be borne by the lower lead rubber bearing 7. Since the horizontal deformation stiffness of the lower lead rubber bearing 7 is greater than that of the upper lead rubber bearing 9, when the ground vibrates, the shock isolator can not only isolate part of the vibration energy from being transmitted to the upper structure, but also prevent The isolator is deformed too much.

Claims (1)

1. A shock isolator with a variable stiffness composite lead rubber bearing, comprising a lower lead rubber bearing (7) and an upper lead rubber bearing (9), characterized in that: the lower lead rubber bearing (7 ) and the upper lead rubber bearing (9) are connected in series through the middle connecting plate (8); the lower end of the lower lead rubber bearing (7) is consolidated with the lower connecting plate (6), and the upper lead rubber bearing (9) The upper end of the lower lead rubber bearing (7) is consolidated with the upper connecting plate (10); the diameter of the lower lead rubber bearing (7) is larger than the diameter of the upper lead rubber bearing (9), and the horizontal deformation stiffness of the lower lead rubber bearing (7) is greater than The horizontal deformation stiffness of the upper lead-core rubber bearing (9); In combination, the outer edge of the limiting steel cylinder (11) is flush with the outer edge of the middle connecting plate (8), the upper edge of the limiting steel cylinder (11) has an inward protrusion, and the bottom end of the protrusion is in contact with the upper connecting plate The bottom ends of (10) are flush; there is a deformation space between the limiting steel cylinder (11) and the upper connecting plate (10).

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