A three-dimensional seismic isolation device with adjustable vertical early stiffness

Abstract

The invention discloses a three-dimensional vibration isolation device with adjustable vertical early-stage rigidity. The device comprises a stacked rubber vibration isolation support and a vertical vibration isolation support which are sequentially connected in series from top to bottom, and is characterized in that a backward pressing device is arranged in a guide sleeve of the vertical vibration isolation support; the backward pressing device comprises two groups of pre-pressing steel cables and two floating pressing plates, wherein the two groups of pre-pressing steel cables are distributed in a central hole of a cylindrical spiral compression spring in a straight-line state respectively; one end of one group of the pre-pressing steel cable is fixed on the floating pressing plate adjacent to a driving pressing plate respectively, and the other end of the pre-pressing steel cable penetrates through the floating pressing plate adjacent to a base respectively and then is anchored on the base through a steel cable self-locking tensioning anchorage device; one end of the other group of the pre-pressing steel cable is fixed on the floating pressing plate adjacent to the base respectively, and the other end of the other group of the pre-pressing steel cable penetrates through the floating pressing plate adjacent to the driving pressing plate respectively and then is anchored on the driving pressing plate through a steel cable self-locking tensioning anchorage device; and the two groups of pre-pressing steel cables are tensioned, so that the cylindrical spiral compression spring is clamped between the two floating pressing plates 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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