JPH1038022A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a base isolation device safely function even when a more severe vibration than estimated is generated, by allowing installed springs or auxiliary installed springs to constantly energize moving supporting bodies. SOLUTION: In a base isolation device where moving supporting bodies 2 provided movably by plural bearings are placed on a supporting panel body 1, the upper surface of which is curved in a concave surface-like form, and a supporting plate 3 for supporting a load to be isolated from vibration is movably placed on the upper surfaces of the moving supporting bodies 2, installed springs 4 for energizing the moving supporting bodies 2 for the moving supporting bodies 2 to be stopped at the center positions of the supporting panel body 1, are provided around the moving supporting bodies 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device using a ball-shaped support, and is mainly used as an anti-vibration device for buildings and as an anti-vibration device for vibration generated in a machine. Related to the device.

[0002]

2. Description of the Related Art Conventionally, as a vibration isolator of this type using a ball bearing, a seismic isolator for ordinary houses described in Japanese Patent Application Laid-Open No. Sho 64-17945 has been proposed. In this seismic isolation device, a hard anti-vibration rubber and a ball bearing are interposed between a base concrete and a foundation concrete of a building structure.

[0003] In addition, by making the contact surfaces of circular balls and ball bearings used in the earthquake-resistant device all concave, the buildings and the like automatically return to a fixed position after the earthquake. The invention is described in JP-A-1-75821.

Further, the present applicant has previously proposed a vibration isolator having a simple configuration and capable of sufficiently absorbing even a vibration having a large amplitude (Japanese Patent Laid-Open No. 5-164168).

[0005]

In the former vibration isolator, the ball bearing is directly interposed between the base concrete and the foundation concrete. Therefore, during a long-term use, the portion in contact with the ball bearing is broken and the base concrete is damaged. There is a possibility that the ball bearing may be buried in the base concrete or the foundation concrete and may not be able to function as a bearing. Further, if the swinging of the ball bearing prevents the shaking several times, the position of the ball bearing may be shifted and may be shifted from a predetermined position having an anti-seismic effect.

On the other hand, in the latter seismic device, a curved surface contact seat is provided at an upper end or a lower end of one ball bearing, and the ball bearing returns to a fixed position along a concave curved surface of the curved surface contact seat. It was made. Therefore, the concave curved surface of the curved surface contact seat is limited to an area where one ball bearing can return, so that the amplitude of the swing prevented by this one ball bearing is extremely small. As a result, in order to make a seismic device capable of withstanding large amplitudes, it is necessary to use ball bearings provided with curved surface contact seats in multiple layers, which is disadvantageous in that the configuration becomes extremely large and complicated. there were.

[0007] In order to solve these disadvantages, the vibration isolator proposed by the present applicant has a simple structure and is capable of sufficiently absorbing even a large amplitude vibration.
However, measures such as those in the event of an earthquake that exceeded expectations, such as the Great Hanshin Earthquake, had not been considered. In other words, if a part of the vibration isolator is damaged due to an earthquake that exceeds the assumption, the movable support placed inside the vibration isolator may come off the support plate inside or move out of the vibration isolator. There is a risk of jumping out.

Accordingly, the present invention has been made to solve the above-mentioned problems, and is capable of sufficiently absorbing vibrations of a large amplitude, having a simple structure, and being generated in a machine from a seismic device such as a building structure. It is an object of the present invention to provide a vibration isolation device that can be widely used up to prevention of vibration, and that can function safely even when unexpected vibration occurs.

[0009]

In order to achieve the above-mentioned object, a first means of the present invention is a moving means provided on a supporting board 1 having a concave upper surface so as to be movable with a plurality of bearings. In the vibration isolator in which the support 2 is mounted and the support plate 3 for supporting the vibration isolation load is movably mounted on the upper surface of the movable support 2, the movable support 2 is stopped at the center position of the support board 1. The installation spring 4 for urging the moving support 2 so that
Around it.

[0010] The installation spring 4 of the second means is a movable support 2
And a plurality of spring members forming a parabola extending from the periphery of the support board 1 to the periphery of the support board 1.

The installation spring 4 of the third means is formed by a spiral spring.

A fourth means is to provide a support 6 for supporting a vibration-isolating load on the support plate 3, and an auxiliary installation spring 7 extending from the support 6 to the periphery of the support plate 1 to position the center of the support plate 1. Is urged to stop the strut 6.

A fifth means is to provide a coil spring 5 for supporting a vibration-isolating load on the support plate 3.

The sixth means is that stop recesses 1A and 3A into which the bearings 2A of the movable support 2 stopped at the center position of the support board 1 are provided on the upper surface of the support board 1 and the lower face of the support plate 3, respectively. The recessed portion is used as a means for solving the problem.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The reference numeral 1 shown in the figure denotes a support board whose upper surface is curved in a concave shape, and is installed on an elastic body 8 made of a hard rubber material or a urethane resin material (see FIG. 1). The support plate 1 in the illustrated example has a plane circular shape, but is not limited to this example. Any support plate having a curved surface having an area in which a movable support 2 to be described later can move is used. It is good (see FIG. 2).

A movable support 2 movably provided by a plurality of bearings is placed on the support board 1. The movable support 2 is provided with a support frame 2B that rotatably supports a plurality of bearings 2A, and supports the upper and lower ends of the bearing 2A on the support frame 2B. In the illustrated example, a support frame 2B having a substantially flat plate shape and a center portion of a bearing 2A is rotatably supported (see FIGS. 1 and 2). At this time, the support frame 2B
Is not limited to the illustrated example, and may be any shape as long as the plurality of bearings 2A can support the upper support plate 3. At this time, the stop recess 1A into which the bearing 2A of the movable support 2 stopped at the center position of the support board 1 is recessed on the upper surface of the support board 1 so that the support board 1 can be stopped at a normal stop position. Can be fixed.

An installation spring 4 is provided around the movable support 2.
Is provided so as to stop the moving support 2 at the center position of the support board 1. The installation spring 4 shown in FIGS. 1 and 2 is formed of a plate-shaped spring material having a parabola extending from the periphery of the movable support 2 to the periphery of the support board 1. The installation spring 4 shown in FIG. 3 is formed of a single linear spiral spring. At this time, the plate-like spring material shown in FIGS. 1 and 2 may be changed to a linear spring material, or the linear spiral spring shown in FIG. 3 may be changed to a plate-like spring material. Good. In short, it is only necessary to press and urge the movable support 2 to the center position.

The support plate 3 supports a vibration-isolating load.
The support plate 3 is movably mounted on the upper surface of the movable support 2. At this time, a stop recess 3A is provided on the lower surface of the support plate 3 similarly to the support board 1, and the bearing 2A of the movable support 2 stopped at the center position of the support board 1 is fitted into the stop recess 3A. In addition, the support plate 3 can be fixed at a normal stop position.

Further, a support column 6 for supporting the vibration isolating load is provided on the support plate 3, and an auxiliary installation spring 7 extending from the support column 6 to the periphery of the support board 1 is provided. This auxiliary installation spring 7
The column 6 is urged to stop at the center position of the support board 1. The auxiliary installation spring 7 shown in FIG. 1 uses a plate-shaped spring material that draws a parabola, similarly to the installation spring 4 shown in FIG. 2.
Or a plate-shaped spiral shape shown in FIG.
In FIG. 4, a vibration isolating load is supported on the support plate 3 by providing the coil spring 5 instead of the auxiliary installation spring 7. On the other hand, the installation spring 4 shown in FIGS. 5 and 6 is formed by a plurality of coil springs extending from the periphery of the moving support 2 to the periphery of the support board 1, and the auxiliary installation spring 7 also uses a coil spring. I have. Thus, the shape and number of the installation springs 4 and the auxiliary installation springs 7 can be arbitrarily selected.

[0021]

According to the present invention, as described above, vibrations having a large amplitude can be sufficiently absorbed.

That is, according to claims 1 and 5,
It absorbs even large amplitude vibrations. In addition, since the installation spring 4 and the auxiliary installation spring 7 constantly urge the moving support 2, even if vibrations more than expected occur, they can function safely.

According to the second to fifth aspects, the structure is simplified, and by selecting the use of the installation spring 4 and the stop recesses 1A and 3A, from the seismic device such as a building structure to the prevention of vibration generated in the machine. Can be used widely.

As described above, according to the present invention, vibrations having a large amplitude can be sufficiently absorbed, the structure is simple, and it can be widely used from seismic devices such as building structures to vibrations generated in machines. In addition to the above, various industrially useful effects such as safe functioning can be obtained even when unexpected vibrations occur.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of the present invention.

FIG. 2 is a plan view showing a movable support placed on a support board.

FIG. 3 is a plan sectional view showing another embodiment of the installation spring.

FIG. 4 is a side sectional view showing another embodiment of the present invention.

FIG. 5 is a side sectional view showing another embodiment of the present invention.

FIG. 6 is a plan sectional view showing another embodiment of the installation spring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support board 1A Stop recess 2 Moving support 2A Bearing 2B Support frame 3 Support plate 3A Stop recess 4 Installation spring 5 Coil spring 6 Support 7 Auxiliary installation spring 8 Elastic body

Claims (6)

[Claims] 1. A support board having an upper surface concavely curved,
In a vibration isolator in which a movable support provided movably with a plurality of bearings is mounted and a support plate for supporting a vertical load is movably mounted on the upper surface of the movable support, the support plate is located at the center position of the support plate. An installation spring for biasing the movable support so as to stop is provided around the movable support. 2. The vibration isolator according to claim 1, wherein the installation spring is formed of a plurality of spring members forming a parabola from the periphery of the movable support to the periphery of the support board. 3. The vibration isolator according to claim 1, wherein the installation spring is formed by a spiral spring. 4. A support for supporting a vibration-isolating load is provided on a support plate, and an auxiliary installation spring extending from the support to the periphery of the support board is provided. The vibration isolator according to claim 1, wherein the vibration isolator is urged to stop. 5. The vibration isolator according to claim 1, wherein a coil spring for supporting the vibration isolating load is provided on the support plate. 6. The support plate according to claim 1, wherein a stop recess in which the bearing of the moving support stopped at the center position of the support plate is fitted in the upper surface of the support plate and the lower surface of the support plate. Vibration isolation device.