JPH0635769B2 - Seismic isolation device and seismic isolation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a seismic isolation device and a seismic isolation device that are mainly installed on a seismic isolation floor.

[Problems to be Solved by the Invention]

Rolling bearings, which are conventionally used as floor seismic isolation methods,
Rolling bearings have the highest insulation effect among sliding bearings, dampers, etc., but when using ball bearings as rolling members, in order to always ensure stable bearing support, the bearing arrangement method, that is,
A problem is how to deal with the relative movement of the bearing on the bearing.

This invention was made by paying attention to the above-mentioned problems faced when using a ball bearing of this rolling bearing,
It is intended to propose a new device that solves the bearing processing problem.

[Means for Solving the Problems]

In the present invention, on the outer periphery of the bearing body mounted on the ball bearing,
By arranging the guide block integrally and providing a clearance between the outer peripheral surface of the support body and the inner peripheral surface of the guide block around the same extent as the diameter of the ball bearing, the device is supported by the support body and the receiving tray on which the ball bearing is mounted. The ball bearing goes into the clearance and circulates during the relative movement of, and solves the processing problem of the ball bearing.

The ball bearing is scooped by the lower end of the guide block and moves into the clearance during relative movement of the bearing, and circulates around the bearing in the direction of movement according to the amount of movement of the bearing.

〔Example〕

Hereinafter, the present invention will be described as an embodiment with reference to the drawings showing a base-isolated floor.

First, the invention described in the first claim will be described.

The isolator A of the invention to support the vertical load of the upper structure B ₁ as shown in FIG. 1, bottom and horizontal scaffold 1, forms a horizontal surface on the lower structure (skeleton) B ₂ A fixed receiving tray 2, a large number of ball bearings 3 interposed between the bottom surface of the supporting body 1 and the upper surface of the receiving body 2, and a guide block 4 arranged around the outer periphery of the supporting body 1 and integrated with the supporting body 1. The bearing 1 rolls on the ball bearing 3 to insulate horizontal vibration of the lower structure B ₂ .

The saucer 2 is made of a smooth and high hardness material, and the lower structure B
It is adhered on the leveling material 5 of special mortar, which is laid to fix the unevenness of the top surface of No. ₂ .

A large number of ball bearings 3 are inserted between the bearing 1 and the tray 2 installed on the tray 2, and the guide block 4 is fixed with a clearance c provided around the bearing 1.

The clearance c is as large as the diameter of the ball bearing 3 as shown in FIGS. 1 and 2, and is provided around the outer circumference of the support 1.

Further, the lower end of the guide block 4 is separated from the upper surface of the tray 2 with a slight gap, and the inner peripheral surface thereof has a shape along the outer peripheral surface of the support body 1, and the guide block 4 moves relative to the tray 2 of the support body 1. Sometimes ball bearing 3 at the bottom
It has a structure to scoop up into the clearance c.

A dust cover 6 is covered on the tray 2 to prevent dust and rust, and a felt seal 7 is adhered to the periphery.

In the case of the illustrated embodiment (base-isolated floor), a girder 8 is installed on the upper structure B ₁ at a distance from the lower structure B ₂ and a floor laid on the supporting structure by supporting legs 9. Panel 10
The vertical load of the upper structure B ₁ is mounted on the support plate 1 and the seat plate 12 that receives the bracket 11 connected to the girder 8, and absorbs the installation error of the tray 2 and the deformation of the girder 8.
It is transmitted to the support 1 via a spherical seat 13 having a spherical bottom surface and a bolt 14 connecting the two. Figure 3 is the first
It is a top view of the bracket 11 position of the figure.

When the upper structure B ₁ moves relative to the lower structure B ₂ ,
In the seismic isolation device A, as shown in FIG. 4, the ball bearing 3 on the side opposite to the moving direction of the support 1 is scooped by the guide block 4 and enters the clearance c, and further the outer peripheral surface of the support 1 and the guide block. (4) A mechanism that cuts off the vibration of the lower structure B ₂ by a mechanism that travels between the inner peripheral surfaces, wraps around in the direction of movement, falls, and is interposed again between the support 1 and the tray 2.

As shown in the embodiment, the seismic isolation device C according to the second aspect of the invention supports the vertical load of the upper structure B ₁ on the support 1 of the seismic isolation device A according to the _{first aspect} , and at the same time, A coil spring 15 for blocking vertical vibration of the lower structure B ₂ is installed with its axis vertical.

In the embodiment shown in FIG. 1, an oil damper 16 for damping vertical vibration is installed in addition to the coil spring 15.
The coil spring 15 is provided between the seat plate 12 and the spherical seat 13 which directly support the girder 8, or when the oil damper 16 is used together, the seat plate 17 to which the oil damper 16 is attached and the spherical seat 1.
It is placed between three.

A vertical movement of the seat plate 17 is guided by a guide 18 fixed on the spherical seat 13, and the seat plate 17 behaves simultaneously with the seat plate 12 by a bolt 14 penetrating therethrough.

This seismic isolation device C exhibits the same behavior as the seismic isolation device A when the lower structure B ₂ is horizontally displaced, and the coil spring 15 absorbs the vertical vibration when the lower structure B ₂ is vertically displaced, and further the oil The damper 16 serves as a mechanism for damping the vibration.

FIG. 5 shows an embodiment in which the oil damper 16 is not used together. In this case, the coil spring 15 is the seat plate 1
2 and the spherical seat 13 are installed, and the seat plate 12 is the spherical seat 1
3 is guided by the guide 18. Reference numeral 19 in the figure denotes a stopper for relative horizontal movement of the upper structure B ₁ .

〔The invention's effect〕

The present invention is as described above. Since the ball bearing under the bearing moves due to the clearance provided between the bearing and the guide block during relative movement of the upper structure and can be circulated, the ball bearing is always supported. And between the saucer and the saucer, the stable support state of the support is maintained,
The insulating effect of the ball bearing can be fully exerted.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2, and FIG.
FIG. 4 is a plan view of a ball bearing portion and a bracket portion, FIG. 4 is a sectional view showing the movement of the ball bearing, and FIG. 5 is a sectional view showing another embodiment. A: seismic isolation device, B ₁ ... upper structure, B ₂ ... lower structure, 1 ... support, 2 ... pan, 3 ... ball bearing, 4 ... guide block, 5 ... leveling Material, c
...... Clearance, 6 ... Dust cover, 7 ... Felt seal, 8 ... Large beam, 9 ... Support legs, 10 ... Floor panel, 11 ... Bracket, 12 ... Seat plate, 13 ... Spherical seat , 14 ... Bolt, C ... Seismic isolation device, 15 ...
Coil spring, 16 ... Oil damper, 17 ... Seat plate, 1
8 ... Guide, 19 ... Stopper.

Claims (2)

[Claims] 1. A support body having a horizontal bottom surface for supporting a vertical load of an upper structure, a saucer fixed on the lower structure in a horizontal plane, and a support body interposed between the bottom surface and the saucer. It consists of a number of spherical ball bearings and a guide block that is placed around the outer periphery of the bearing and is integrated with the bearing. The seismic isolation device is characterized in that the ball bearing circulates when moving and is circulated so that a clearance having the same diameter as the diameter of the ball bearing is circulated. 2. A coil spring for supporting the vertical load of the upper structure and at the same time isolating the vertical vibration of the lower structure on the upper part of the support of the seismic isolation apparatus according to claim 1 makes the shaft vertical. Seismic isolation device is characterized by being installed as