JPS62159824A - Earthquake motion releasing/vibration removing support device - Google Patents

Abstract

PURPOSE:To remove the vibrations in the horizontal and vertical directions over a wide frequency range from a large earthquake motion to a minute vibration by combining three kinds of vibration damping means: multistage type rubberlike elastic bodies, magnetic force spring,and a dynamic vibration reducer. CONSTITUTION:On a base 11, the first floor 13 is supported by interposing an earthquake motion releasing support device 12 made up of multistage type rubberlike elastic bodies, and on the first floor 13 the second floor 15 is supported by interposing magnetic force springs 14. Further, on the lower central part of the first floor 13 a dynamic vibration reducer 16 is fitted. Thus, the vibrations in both the horizontal and vertical directions can be removed, and the vibration being transmitted from a base 11 to the upper surface of the second floor 15 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a seismic isolation and vibration isolation support device that is installed between a base and a structure and elastically supports the structure.

[Prior art]

In buildings constructed on foundations and machinery and equipment installed on platforms, it may be required to reduce transmission of images due to earthquakes, passing vehicles, etc. as much as possible.

Especially nuclear equipment, computers, semiconductor products;! l;
Shi big buttocks, Su 11 I ten ヱ 嬑 (self-te?fu)
π? ＼For structures that require density,
It is required to block out vibrations ranging from large earthquake motions to minute vibrations over a wide range of frequencies.

In order to meet such demands, the present applicant has proposed a seismic isolation support device using a multi-stage rubber-like elastic body as shown in FIGS. 7 and 8 as a mechanism for elastically supporting the structure on the base. This was proposed in Japanese Patent Application No. 134692/1983.

In FIGS. 7 and 8, the seismic isolation support device stacks a plurality of rubber-like elastic bodies 1 (eight in the illustrated example) vertically at multiple positions on a plane (four in the illustrated example), and It has a structure in which the upper and lower end surfaces of the rubber-like elastic body 1 at each stage are connected to each other by a stable ff12, and is installed between the base 3 and the structure 4 and used to support the weight of the structure. Ru.

As the rubber-like elastic body l, a block body made only of an elastic material or a block body of an elastic body reinforced with cords, woven fabric, etc. can be used, but from the viewpoint of reducing vertical displacement and increasing horizontal displacement. It is preferable to use a laminated type elastic body having a structure in which a rubber-like elastic material and reinforcing plates such as steel plates or hard plastic plates are alternately laminated and integrated.

However, although conventional seismic isolation support devices using only such multi-stage rubber-like elastic bodies are effective in attenuating horizontal seismic forces, Due to the number, the dominant frequency is 10Hz
There was a problem in that it amplified constant vertical tremors and traffic vibrations in ~5011z.

〔the purpose〕

The purpose of the present invention is to solve the problems of conventional seismic isolation support devices using such multi-stage rubber-like elastic bodies, to ensure seismic isolation performance even with small live loads, and to improve the vibration transmissibility near the vertical natural frequency. It is an object of the present invention to provide a seismic isolation and vibration isolation support device that can reduce the amount of vibration and is also effective in damping vibrations in the vertical direction and isolating minute vibrations.

[Summary] The present invention achieves the above object by combining three types of vibration damping means: a multistage rubber-like elastic body, a magnetic spring, and a dynamic vibration absorber, to eliminate vibrations in both horizontal and vertical directions. It is something to be achieved.

〔Example〕

The present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a central longitudinal section (line 1-I in FIG. 2) of a seismic isolation and vibration isolation support device according to an embodiment of the present invention, and FIG. 2 shows the seismic isolation and vibration isolation support device of FIG. A partially cutaway view of the device support device is shown.

In FIGS. 1 and 2, a first floor is supported on the base 11 with a seismic isolation support device 12 interposed therebetween, and the first floor
A second floor 15 is supported on the floor with a magnetic spring 14 interposed therebetween.

In the illustrated example, the first floor 13 is supported by four seismic isolation support devices 12, and each seismic isolation support device is located at multiple locations on the plane (as in the case of FIGS. 7 and 8). It has a structure in which the rubber-like elastic bodies 1 are stacked vertically in multiple stages (for example, eight stages) at four locations, for example, and the upper and lower end surfaces of the rubber-like elastic bodies 1 at each stage are connected to each other by a stabilizing plate 2.

The magnetic spring 14 supports the second floor 15 in a non-contact state using the repulsive force and damping force of the magnet.
In the illustrated example, nine magnetic springs 14 are used.

In addition, a dynamic vibration absorber 16 is provided at the center of the lower surface of the first floor 13.
is installed.

This dynamic vibration absorber 16 has a spring portion 17 made of a rubber-like elastic body.
It has a structure in which an inertial mass (weight) 18 such as a steel plate is connected via a
It has the function of reducing vibrations.

Furthermore, a magnetic spring 19 is provided between the periphery of the first floor 13 and the base 11 side to absorb vibrations in the horizontal direction.

Therefore, the structure 20 supported with seismic isolation and vibration isolation on the base 11
is installed on the second floor 15.

FIG. 3 is an explanatory diagram schematically showing the seismic isolation and vibration isolation support device described in FIGS. 1 and 2.

In FIG. 3, each of the base isolation support devices 12 and the μξ capo light 14. IQL person is changed to AM-, Sujidango l (way t
57 in size, and has a function of connecting a spring and a dashpot in parallel.The dynamic vibration absorber 16 connects the mass with an elastic support that causes loss, and the inertial mass is connected with the spring and dashpot in parallel. It has the function of connecting 18 units.

Thus, according to the present invention, by combining three types of vibration damping means, the multistage rubber-like elastic body 12, the magnetic spring 14, and the dynamic vibration absorber 16, vibrations in both the horizontal and vertical directions are removed, and the A seismic isolation and vibration isolation support device is provided that can reduce vibrations transmitted from the stand 11 to the upper surface of the second floor 15.

The operation of each vibration damping means of the seismic isolation and vibration isolation support device described above will be explained with reference to FIGS. 4 to 6.

First, the seismic isolation support device 12 made of a multistage rubber-like elastic body mainly reduces large horizontal displacements and horizontal microvibrations during earthquakes, but it has a resonance point at a relatively low frequency fv. With only the seismic isolation support device, the upper surface of the first floor 13 (7
The vibration transmissibility (Y/X) up to point fy is extremely small in the high frequency range as shown in FIG. 4(B), but shows a peak value (for example, about 20) at resonance point fy. Therefore, low frequency vibrations in the horizontal direction resonate only with the seismic isolation support device 12.

As shown in Fig. 5 (A), the dynamic vibration absorber 1 is attached to the device shown in Fig. 4 (A).
6, the vibration transmissibility near the resonance frequency in FIG. 4(B) is divided into two peaks as shown in FIG. 5(B), and therefore the base 11 in FIG. 5(A)
The vibration transmissibility (Y/X) from (point X) to the upper surface of the first floor 13 (point Y) becomes smaller.

Furthermore, when a magnetic spring 14 is added to the device of FIG. 5(A) as shown in FIG. 6(A), the overall vibration transmissibility of FIG. 5(B) is reduced due to the spring effect and damping effect of the magnetic spring. The base 11 in FIG. 6(A)
The vibration transmissibility (Z/X) from (point X) to the upper surface (two points) of the second floor 15 is reduced overall and effectively as shown in FIG. 6(B).

Note that lateral vibrations such as earthquake motion can be absorbed and attenuated by horizontal displacement of each seismic isolation support device 12, which is constructed by connecting multi-stage rubber-like elastic bodies 1 with a stabilizing plate 2; however, in the illustrated example, Since the magnetic spring 19 that behaves horizontally is disposed around the floor 13 in FIG. 1, its damping effect can dampen the vibration more quickly and eliminate even the smallest vibrations in the lateral direction.

According to the above embodiment, the following effects are achieved.

l) The natural frequency can be lowered compared to conventional seismic isolation support devices that use coil springs, etc., thereby improving seismic isolation performance.

ii) Seismic isolation support device 1 consisting of multistage rubber-like elastic body 1
2 is used, even when the stacked load (weight of the structure 20) is small, it is possible to exhibit seismic isolation and damping effects at the equipment level and floor level.

iii) Stability against rocking is improved compared to air spring support systems.

iv) Since surging, which occurs with the coil spring method, does not occur, vibrations can be stably damped over a wide frequency range.

(2) Since it is combined with the magnetic spring 14, it is possible to effectively exhibit a damping function from very large vibrations to minute vibrations.

vi) The rise and fall of the horizontal shaking caused by earthquake motion is a magnetic spring (damper).
19, the lateral vibrations are effectively eliminated in a wide frequency range down to minute vibrations.

Note that the combinations of the multistage rubber-like elastic body (seismic isolation support device 12), magnetic spring 14, and dynamic vibration absorber 16, such as the arrangement and number, are not limited to the combinations shown in the illustrated embodiments. It can be implemented in various ways.

For example, a magnetic spring 1 is installed between the base 11 and the first floor 13.
It is also possible to install a seismic isolation support device 12 made of a multistage rubber-like elastic body between the first floor 13 and the second floor 15.

As is clear from the above description, the present invention provides an isolation device that can effectively remove horizontal and vertical vibrations from large seismic motions to minute vibrations over a wide frequency range. An earthquake vibration isolation support device is obtained.

[Brief explanation of drawings]

FIG. 1 is a central vertical sectional view taken along line 1-1 in FIG. 2 of a seismic isolation and vibration isolation support device according to an embodiment of the present invention;
3 is a schematic illustration of the support device shown in FIG. A schematic explanatory diagram shown in conjunction with a graph, FIG. 7 is a side view of a conventional seismic isolation support device,
FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7. 1--1---Multi-stage rubber-like elastic body, 2----- Stable plate, 11, --- Base, 12--1--- Seismic isolation support device, 14---- Magnetic force Spring, 16 - one-acting vibration absorber. Agent: Yasushi Ooto, Patent Attorney Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) Multistage rubber-like elastic body, magnetic spring, and dynamic vibration absorber
A seismic isolation and vibration isolation support device characterized by eliminating vibrations in both horizontal and vertical directions by combining different types of vibration damping means.