JPH10331479A - Vibration isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the selection of material quality of a holding plate and bearing plate by arranging a plurality of steel balls between holding plate and bearing plate to disperse load of a structure with a large number of steel balls. SOLUTION: A holding plate 1 is so constituted that a ring-shaped groove thread is provided to the upper part side thereof to form an upper surface 1a and that a ring-shaped ball bearing 5 is easily set. The bearing plate 3 is fixed to a structure S through a middle plate 4, and a lower surface 3a opposed to the holding plate 1 is horizontally and flatly formed. As the ball bearing 5, marketable goods can be used, a plurality of steel balls 5b, 5b... are arranged between the upper surface 1a of the holding plate 1 and the lower surface 3a of the bearing plate 3 while keeping specific intervals on a circular ring- shaped ball holder 5a, and the holding plate 1 and bearing plate 3 are combined with each other in a state of roller bearing. A vibration isolation device having such construction can bear the load of the structure S with a large number of steel balls, so that the material quantity selection of both holding plate 1 and bearing plate 3 can be easily made because the load is not concentrated in one point of the holding plate 1 and bearing plate 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a seismic isolation device,
In particular, it relates to a seismic isolation device using a rolling bearing.

[0002]

2. Description of the Related Art Conventionally, a seismic isolation device using a rolling bearing of this type has been proposed in order to insulate the vibrating ground from a building structure (hereinafter, referred to as a "structure") as far as possible to minimize the friction of the rolling surface. It is designed to be smaller.

For example, in a seismic isolation device disclosed in Japanese Patent Publication No. Hei 6-35769, a large number of ball bearings are provided on a tray on the foundation side, and a bearing body for supporting a structure is placed on the ball bearings. It is configured as follows.

In the seismic isolation device disclosed in Japanese Patent Publication No. 5-14062, one large-diameter steel ball is placed on a pan on the foundation side, and a large number of steel balls are placed on the upper surface of the large-diameter steel ball. It is configured to dispose a steel ball having a small diameter to support a structure.

The above-described seismic isolation device of a rolling bearing using a ball bearing or a steel ball has a feature that the friction coefficient, that is, μ, can be extremely reduced, and a rubber formed by laminating rubber plates. It has the features of being able to withstand higher loads than the bearing and of being low cost.

[0006]

However, in the above-mentioned conventional seismic isolation device of a rolling bearing in which a number of ball bearings are provided on a receiving tray, when contact occurs between the ball bearings on the receiving tray, friction increases. In addition, in the seismic isolation device using one large-diameter steel ball, since the load of the structure is concentrated on one point of the pan, the material of the pan must be a special high-strength material. There was a point.

Accordingly, the present invention has been made to solve the above problems, and has as its object to eliminate the possibility of contact between steel balls and to support the structure by dispersing the load of the structure. It is to provide a seismic isolation device which can be used.

[0008]

In order to achieve the above object, a seismic isolation device according to the present invention moves a support plate supporting a structure on a receiving plate provided on a foundation side in a horizontal direction. In a seismic isolation device that is freely mounted, a plurality of steel balls are arranged at an interval from each other via a ball holder between an upper surface of the receiving plate and a lower surface of the supporting plate, and the receiving plate and It is characterized in that the support plate and the rolling bearing are combined. Further, a solid lubricant made of molybdenum disulfide or the like is attached to the upper and lower surfaces. Further, a solid lubricant made of molybdenum disulfide or the like is attached between the steel ball and the ball holder.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a left half of a seismic isolation device according to an embodiment in cross section, and FIG.
FIG. 4 is a cross-sectional view taken along a line A.

The receiving plate 1 is made of a circular steel plate, and an upper surface 1a of a portion on which a ball bearing 5 to be described later is mounted has a horizontal shape.
Further, it is formed flat and provided on the foundation B via the intermediate plate 2. Although not shown, the receiving plate 1
And the intermediate plate 2 is fixed to the foundation B via anchor bolts.

The upper surface 1a is formed on the upper side of the receiving plate 1 as a ring-shaped groove. Therefore, the ring-shaped ball bearing 5 can be easily set. But,
Without forming the upper surface 1a in a groove, a support plate 3 described later is used.
As shown in the lower surface 3a of FIG.

The supporting plate 3 is made of a circular steel plate like the receiving plate 1, and the lower surface 3a of the receiving plate 1 on the side facing the upper surface 1a is formed horizontally and flat.
It is provided below the structure S via the intermediate plate 4. Although not shown, the support plate 3 and the intermediate plate 4 are
It is fixed to the structure S by a fixture such as a nut.

The ball bearing 5 has the same structure as a well-known thrust load ball bearing, and is available as a commercial product.
A plurality of steel balls 5b are provided at a predetermined interval in a circular ring-shaped ball holder 5a. And
The ball bearing 5 is disposed between the upper surface 1a of the receiving plate 1 and the lower surface 3a of the supporting plate 3, and combines the receiving plate 1 and the supporting plate 3 into a rolling bearing.

In the seismic isolation device having the above structure, since the load of the structure S can be supported by a large number of steel balls, the load does not concentrate on one point of the receiving plate 1 and the supporting plate 3. The material 3 can be easily selected. Also,
Since the steel balls 5b of the ball bearing 5 are held by the ball holder 5a, the contact between the steel balls can be effectively prevented.

FIG. 3 shows another embodiment of the present invention, in which a coil spring, a laminated rubber, an air spring, or the like for blocking vertical vibration between the receiving plate 1 and the foundation B is used. A vibration device 6 is provided.

That is, the vibration isolator 6 is provided between the intermediate plate 2a provided on the lower side of the receiving plate 1 and the intermediate plate 2b provided on the base B side. In cooperation with the device, it is possible to exhibit more anti-vibration / isolation effects.

The vibration isolator 6 may be provided between the support plate 3 and the structure S.

[0018]

According to the seismic isolation device of the present invention, a plurality of steel balls are arranged between the upper surface of the receiving plate and the lower surface of the supporting plate at a distance from each other via a ball holder. Since the support plate and the support plate are combined in a rolling bearing shape, the load of the structure can be dispersed and supported by a large number of steel balls, and the material of the receiving plate and the support plate can be easily selected. Furthermore, since each steel ball is held by a ball holder,
Contact between steel balls can be effectively prevented. When a solid lubricant made of molybdenum disulfide or the like is attached to the upper and lower surfaces, the movement of the steel ball can be improved. Further, when a solid lubricant made of molybdenum disulfide or the like is attached between the steel ball and the ball holder, the movement of the steel ball can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a left half of a seismic isolation device according to an embodiment of the present invention in cross section.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a front view showing a left half of a seismic isolation device according to another embodiment of the present invention in cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving plate 1a Upper surface 2, 2a, 2b, 4 Intermediate plate 3 Support plate 3a Lower surface 5 Ball bearing 5a Ball holder 5b Steel ball 6 Anti-vibration device

Claims (3)

[Claims] 1. A seismic isolation device having a support plate supporting a building structure movably mounted in a horizontal direction on a support plate provided on a foundation side, wherein an upper surface of the support plate and the support are provided. A seismic isolation device characterized in that a plurality of steel balls are arranged at a distance from each other via a ball holder between the lower surface of the plate and a steel plate, and the receiving plate and the supporting plate are combined in a rolling bearing shape. . 2. The seismic isolation device according to claim 1, wherein a solid lubricant made of molybdenum disulfide or the like is attached to the upper surface and the lower surface. 3. The seismic isolation device according to claim 1, wherein a solid lubricant made of molybdenum disulfide or the like is attached between the steel ball and the ball holder.