A three-dimensional seismic isolation bearing capable of adjusting vertical early stiffness

Abstract

The invention discloses a three-dimensional seismic isolation bearing capable of adjusting vertical early rigidity. The three-dimensional seismic isolation bearing comprises a laminated rubber seismic isolation bearing and a vertical seismic isolation bearing which are sequentially connected with each other in series up and down and is characterized in that a back pressure device is further arranged in a guide sleeve of the vertical seismic isolation bearing, the back pressure device comprises two groups of prepressing steel cables and two floating platens, wherein the two groups of prepressing steel cables are distributed between a composite spring and the guide sleeve, one end of each prepressing steel cable of one group of prepressing steel cables is fixed on the floating platen adjacent to a driving platen, and the other end of each prepressing steel cable of one group of prepressing steel cables penetrates through the floating platen adjacent to a base and is anchored on the base by a steel cable self-locking and tensioning anchorage device; one end of each prepressing steel cable of the other group of prepressing steel cables is fixed on the floating platen adjacent to the base, and the other end of each prepressing steel cable of the other group of prepressing steel cables penetrates through the floating platen adjacent to the driving platen and is anchored on the driving platen by the steel cable self-locking and tensioning anchorage device; the two groups of prepressing steel cables are tensioned, so that the composite spring is clamped between the two floating platens all the time.

Description

technical field [0001] The invention relates to a building anti-vibration (or shock) device, in particular to a three-dimensional shock-isolation device in which a sandwich steel plate rubber pad is connected in series with a vertical shock-isolation support. Background technique [0002] The seismic isolation device is an anti-seismic isolation device installed between the building and the foundation. The early seismic isolation devices were mainly two-dimensional isolation bearings (laminated rubber isolation bearings) composed of rubber and thin steel plates alternately laminated, which could only isolate the horizontal component of seismic waves. With the improvement of people's understanding of the multi-dimensional characteristics of earthquakes, three-dimensional seismic isolation devices have gradually attracted the attention of researchers in this field. The most common three-dimensional isolation device is composed of laminated rubber isolation bearings connected ...

AI Technical Summary

Problems solved by technology

Although the scheme described in this patent application can improve the tensile strength of the three-dimensional seismic isolation device to resist the huge tension generated by the swaying or even overturning of high-rise buildings in an earthquake, the following deficiencies still exist: 1. The spring isolation The support can only be compressed for energy consumption and shock absorption, but cannot be stretched for energy consumption and shock absorption; 2. The spring isolation support cannot preset the early stiffness, which is not convenient for presetting the seismic intensity to reduce the cost of isolation

However, this invention still has the following disadvantages: 1. The load connecting rod is balanced under the joint action of two groups of disc springs. Although the preload of the two groups of disc springs can be adjusted, no matter how they are adjusted, the The force of the disc spring on the load connecting rod is a set of equal and opposite forces. Just applying any external force on the load connecting rod will destroy this balance and deform the two sets of disc springs. Therefore, the 2. In this invention, two sets of disk springs must be used together to provide damping when the damper is under compression or tension load, which not only causes a certain waste, but also makes the damper greatly increased in length

It can be seen that although the stiffness of the spring in the patent application scheme can be changed, the effective working length of the spring is not only significantly shortened, but also can only be compressed for energy consumption and vibration reduction, and cannot be stretched for energy consumption and vibration reduction.

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