JPH10339052A - Base isolation bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation bearing device requiring low manufacturing costs, and having the capability of resisting even a vertical vibration. SOLUTION: A cylindrical rail 3 curved like a circular arc is movably laid so as to stride over a rail seating 2-2 having a center near a seating 2, and both ends fixed thereto at positions away from the seating 2, and a bearing body seating 4-2 having a turning shaft 5 in parallel with seating surface at the end of a projection formed on a seating 4. In addition, a connecting body 6 is provided for embracing the turning shaft 5 in a direction orthogonal with the cylindrical rail 3 and rotatably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device used for a light-weight structure.

[0002]

2. Description of the Related Art Conventionally, there has been proposed a seismic isolation device in which a concave surface of a receiving tray is brought into contact with a support body. In this prior art, the concave surface of the pan body is made spherical because the surface pressure of the contact surface is always constant even if the contact surface (concave surface) between the bearing body and the pan is relatively displaced by horizontal movement. . For example, as shown in FIG. 7, a saucer 1 having a spherical concave surface 12a
In this structure, a support 11 joined to a medium 14 is combined so that a low friction material (fluorine resin) 13 is pressed onto the support 2, and a structure is placed on the support 11.

The low-friction material 13 has a spherical surface so as to be rotatable at the joint surface of the medium 14. Due to a large earthquake, a vibration having an acceleration equal to or more than the product of the friction coefficient of the low-friction material and the gravitational acceleration acts on the receiving surface. When the support 12 and the support 11 slide relative to each other, the low friction material 13 rotates in the medium 14 of the support 11 and can slide with the same surface pressed against the concave surface of the tray 12. At this time, when the position is off the center of the tray, it is always at a position higher than the center, so that the force returning to a lower position due to gravity acts as a restoring force and returns to the original center.

In this conventional apparatus, the manufacturing cost for forming the concave surface of the receiving tray 12 as a spherical concave surface increases. Also, when the structure is largely locked, the support body 11 rises,
There is a problem that the medium 14 may be detached from the concave surface of the support 11.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a seismic isolation bearing device having a structure in which the manufacturing cost is low and the bearing body does not come off the tray.

[0006]

The structure of the present invention for solving the above problems is a seismic isolation bearing device as described in the claims. That is, (1) a cylindrical rail that is curved in an arc shape is parallel to the pedestal surface at the end of a rail pedestal fixed to the pedestal and a projection provided on the pedestal such that the center is near the pedestal and both ends are separated from the pedestal. A seismic isolation bearing device comprising a coupling body movably straddling a support base having a rotation axis and a cylindrical rail, and gripping the rotation axis in a direction perpendicular to the cylindrical rail and rotatably. (2) The seismic isolation bearing device according to (1), wherein a low-friction material layer or a rolling element bearing is provided on an inner peripheral surface of a coupling body that grips the rotation shaft and the cylindrical rail. (3) The exemption according to the above (1) or (2), wherein the connecting body is configured to hold the rail movably along the rail so that the connecting body does not derail from the rail. Seismic bearing device.

The seismic isolation bearing device of the present invention will be briefly described with reference to the drawings. As shown in FIG. 1, when a building 8 is provided on a foundation 1, The seismic isolation bearing device of the present invention is installed in a number corresponding to a predetermined load.

An outline of the seismic isolation bearing device of the present invention is as follows:
A rail base 2-2 having a curved cylindrical rail 3 on a pedestal 2 in contact with the pedestal 2 and a bearing pedestal having a rotating shaft 5 at the tip of a projection of a pedestal 4 in contact with the structure 8 are connected to the rail pedestal 2- 2 and the support base are connected so that they can move with each other.

The rail pedestal 2-2 fixes the rail 3 in a direction such that the center of the curved cylindrical rail 3 is close to the pedestal 2 and both ends are separated from the pedestal 2. The connecting body 6 is a cylindrical rail 3
The cylindrical rail 3 and the rotating shaft 5 are connected so that the center axis of the cylindrical rail 3 and the rotating shaft 5 of the support base 4-2 are located in planes orthogonal to each other. The material of the cylindrical rail 3 may be a steel material or a resin, such as stainless steel, which slides smoothly and hardly rusts. Further, even if the rail 3 is not a cylinder but a cylinder, the operation does not change.
That is, after the end of the vibration due to the earthquake, the connected body 6 returns to the center of the cylindrical rail 3 by gravity. Long period setting of seismic isolation structure is possible by radius of curvature of cylindrical rail.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

[0011]

FIG. 2A is an explanatory front view of a seismic isolation device of the present invention.
FIG. 2B is an explanatory view of a cross section taken along line II of FIG. 2A. In this example, as in FIG. 1, the rail base 2-2 is arranged on the foundation side such that the support base 4-2 is on the structure side.

This example is basically the same as the one shown in FIG. 2
And a connecting body 6 straddling the cylindrical rail 3 and holding the rotating shaft 5 in a direction perpendicular to the cylindrical rail. FIG. 2A
And B show the connecting body 6 straddling the cylindrical rail 3
Has a C-shaped contact surface and grips the cylindrical rail 3, so that the connecting body 6 does not derail from the cylindrical rail even if there is a pitching during an earthquake. Further, the frictional resistance can be reduced by interposing a low friction material on the contact surface between the cylindrical rail 3 and the connecting member 6 and the contact surface between the rotating shaft 5 and the connecting member 6.

FIGS. 3 and 4 are front views for explaining the operation of the apparatus shown in FIGS. 2A and 2B. FIG. 3 shows a state at rest and is the same as FIGS. 2A and 2B. FIG. 4 shows a state in which the connecting body 6 has moved to the end of the rail 3 during the vibration. As shown in this figure, since the bearing base 4 is fixed to the structure, it is always kept parallel to the rail base 2. Therefore, the rotating shaft 5 held by the connecting body 6 must rotate with respect to the connecting body 6.

The example shown in FIG. 5 is an example in which the seismic isolation bearing device shown in FIGS. In this example, the support base 4 is fixed to the lower foundation, and the rail base 2 is fixed to the upper structure.

FIG. 6 is an explanatory view of the connecting body 6 in the seismic isolation bearing device of the present invention. FIG. 6A is a front view in which the portion in contact with the cylindrical rail is viewed downward and the portion in contact with the rotating shaft 5 is viewed upward in the same direction as FIGS. FIG. 6B and FIG. 6C are a side sectional view and a front view of each ring of the low friction material 7-1 in contact with the rotating shaft, respectively. 6B and 6C disperse the strain generated when the low-friction material operates as compared to the case where the low-friction material 7-1 is formed into an integral shape, since a thin ring as shown in FIGS. 6B and 6C is integrated. Less damage of low friction material. The same applies to the low friction material 7-2, and the low friction material group 10 in FIG. 6A is an example thereof.
The low friction material to be fixed inside is preferably made of a material having good slip such as fluororesin and thermoplastic resin, but the above fluororesin having good slip on the surface of a core material made of steel or plastic material is preferable. And those coated with a thermoplastic resin are also effective.

[0016]

As described above, the seismic isolation bearing device of the present invention has a simple structure, so that its manufacturing cost is low and it can withstand vertical swing. Therefore, it is suitable for seismic isolation of a structure with a relatively small load such as a computer.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of an arrangement of a seismic isolation bearing device of the present invention;

FIG. 2 is a front view (A) of an example of the seismic isolation bearing device of the present invention.
And a sectional view taken along the line II (B),

FIG. 3 is a front view of an example of the seismic isolation bearing device of the present invention at rest,

FIG. 4 is a front view of an example of the seismic isolation bearing device of the present invention during exercise;

FIG. 5 is an illustration of the seismic isolation bearing device of the present invention, in which the rail base is up;
Explanatory drawing of an example in which a connected body is arranged below,

FIG. 6 is an explanatory view of a connection body and a low friction ring of the seismic isolation bearing device of the present invention,

FIG. 7 is an explanatory view of an example of a conventional seismic isolation bearing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Pedestal 2-2 Rail pedestal 3 Cylindrical rail 4 Pedestal 4-2 Bearing body pedestal 5 Rotating shaft 6 Connecting body 7-1 Low friction material 7-2 Low friction material 8 Structure 9 Low friction material ring 10 Low friction Material group 11 Bearing body 12 Receiving tray 12a Concave face of receiving tray 13 Low friction material 14 Medium 15 Lid

Claims (3)

[Claims] An arcuately curved cylindrical rail is rotated in parallel with the pedestal surface around a rail pedestal fixed to the pedestal and a projection provided on the pedestal such that its center is close to the pedestal and both ends are separated from the pedestal. It is characterized by comprising a connecting body that movably straddles a bearing base having a moving shaft and a cylindrical rail, and that holds the rotating shaft in a direction perpendicular to the cylindrical rail and rotatably. Seismic isolation bearing device. 2. A low-friction material layer or a rolling element bearing is provided on an inner peripheral surface of the connecting body that grips the rotating shaft and an inner peripheral surface of the connecting body that grips the cylindrical rail. The seismic isolation bearing device according to claim 1. 3. The connecting body according to claim 1, wherein the connecting body holds the rail movably along the rail so that the connecting body does not derail from the rail. Seismic isolation bearing device.