JPH06346628A - Three-dimensional base isolation device - Google Patents

Abstract

PURPOSE:To facilitate the design of a vertical base isolation device in the case that a spring is connected to a laminated rubber in series to isolate three dimensional vibrations. CONSTITUTION:There are provided a vertical base isolation device 2 comprising a pair of opposed flanges 21, 22 and a spring member 23 interposed between the flanges 21, 22, wherein a protrusion 211 is formed on the flange 21 on the side of the opposite flange 22 and a cylindrical engaging part 221 encircling the protrusion 211 so as to be relatively movable in a vertical direction and two horizontal base isolation devices 3, 3 comprising laminated rubbers 31. The devices 3, 3 are disposed respectively on the axially opposite sides of the device 2 so as to hold the device 2 from above and below so that the device 2 is joined to each of the flanges 21, 22, whereby bending moment acting on the device 2 is reduced and the connection between the protrusion 211 and the part 221 is simplified thereby facilitating the design of the device 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional seismic isolation device that insulates vibrations in horizontal and vertical three-dimensional directions.

[0002]

PRIOR ART AND PROBLEM TO BE SOLVED BY THE INVENTION Building 3
In addition to the horizontal direction, a way to realize seismic isolation in the dimensional direction is to install a soft seismic isolation device between the upper and lower structures in the vertical direction as well as to install the upper structure with the horizontal seismic isolation device. There is a method of supporting and installing a soft seismic isolation device in the vertical direction in this superstructure, but the latter method reduces the area that is substantially seismically isolated from the superstructure, resulting in poor efficiency. The former is a rational method because of disadvantages such as being uneconomical.

According to the former method, it is necessary to increase the wall thickness of the rubber in order to reduce the vertical rigidity of the laminated rubber bearing having a small horizontal rigidity, but if the wall thickness is increased, the creep deformation of the rubber due to the vertical load will occur. Is too large and it is difficult to manufacture a laminated rubber having a large rubber thickness in the vulcanization process, and the vertical rigidity is limited, and the range of frequencies at which insulation is possible is limited.

The limit of the decrease in vertical rigidity when the laminated rubber is used alone is solved by connecting the laminated rubber of the horizontal seismic isolation device to the spring of the vertical seismic isolation device in series as shown in FIG. , The design becomes difficult because it is necessary to transfer the bending moment between the vertical seismic isolation device and the structure on that side. In this case, the flange of the vertical seismic isolation device is provided with a cylindrical engaging portion that surrounds the protrusion of the structure on the side so as to be relatively movable in the vertical direction, and a guide such as a bearing is installed on the inner periphery thereof. However, in order to allow vertical displacement between the vertical seismic isolation device and the structure on the side of the vertical seismic isolation device to cause shear deformation in the horizontal seismic isolation device, the connection between the guide and the structure can be moved in the vertical direction. In addition, it is necessary to be able to transmit the bending moment between them, and it is difficult to design to satisfy these both conditions.

The present invention has been made in view of the above background, and is a three-dimensional seismic isolation device in which a vertical seismic isolation device can be easily designed when three-dimensional vibration is insulated by connecting a spring to a laminated rubber in series. Is a new proposal.

[0006]

According to the present invention, between two horizontal seismic isolation devices made of laminated rubber, a vertical seismic isolation device made of a pair of opposed flanges and a spring material installed therebetween is disposed. This simplifies the connection of both flanges of the vertical seismic isolation device and facilitates the design of the vertical seismic isolation device.

One protrusion of the vertical seismic isolation device is provided with a protrusion on the opposing flange side, and the other flange is provided with a cylindrical engaging portion surrounding the protrusion so as to be relatively movable in the vertical direction. It The engaging part surrounds the protrusion so that it can move relative to the vertical direction, allowing relative vertical displacement between both flanges during vertical vibration, preventing relative horizontal displacement between flanges during horizontal vibration, and allowing both flanges to behave simultaneously. .

The horizontal seismic isolation devices are arranged on both sides of the vertical seismic isolation device in the axial direction, and the vertical seismic isolation device is sandwiched from above and below and joined to each flange.

Since the bending moment acting on the whole of the three-dimensional seismic isolation device during the relative horizontal displacement between the upper and lower structures is linearly distributed with the central portion in the axial direction as an inflection point, the upper and lower horizontal seismic isolation devices are isolated. By arranging the vertical seismic isolation device in the middle, transmission of bending moment between the upper and lower flanges of the vertical seismic isolation device is reduced, and the connection between the protrusion and the engaging part has a simple structure that can transmit shear force. Well, the design of the vertical seismic isolation device becomes easy and the degree of freedom increases.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment.

As shown in FIG. 1, a seismic isolation device 1 of the present invention comprises a vertical seismic isolation device 2 for insulating vertical vibrations and two horizontal seismic isolation devices 3, 3 for insulating horizontal vibrations connected in series. ,
By arranging the vertical seismic isolation device 2 between the horizontal seismic isolation devices 3 and 3, the bending moment acting on the vertical seismic isolation device 2 during horizontal vibration is reduced.

The vertical seismic isolation device 2 comprises a spring member 23 installed between the upper and lower flanges 21 and 22 and the opposed flanges 21 and 22, and insulates vertical vibration while bearing a vertical load. A protrusion 211 is provided on the opposing flange 22 side of the one flange 21, and a cylindrical engagement portion 221 is provided on the other flange 22 so as to surround the protrusion 211 so as to be relatively movable in the vertical direction. For the spring material 23, in addition to the coil spring shown in FIG. 1 and the disc spring shown in FIG. 4, a vertically soft rubber-like substance is used.

The engaging portion 221 is movable relative to the protrusion 211 in the vertical direction so as to be in contact with or close to the outer periphery of the protrusion 211 and surround the protrusion 211. By horizontally engaging the protrusion 211 during relative horizontal displacement, the horizontal force is transmitted between the flanges 21 and 22.
As shown in (1), shear deformation is caused in the horizontal seismic isolation devices 3, 3 which are connected vertically. At the time of vertical displacement between the structures 4 and 5, the flanges 21 and 22 are relatively displaced by the clearance between the protrusion 211 and the flange 22, so that the spring member 23 causes vertical vibration and insulates the vibration.

The horizontal seismic isolation device 3 comprises a laminated rubber 31 and flanges 32, 32 adhered to both ends in the axial direction thereof, and bears a vertical load while insulating the vibration by shear deformation of the laminated rubber 31 during horizontal vibration. To do. When the horizontal seismic isolation device 3 and the vertical seismic isolation device 2 are manufactured independently, one flange 32 of each horizontal seismic isolation device 3 has a lower structure 4 or an upper structure 5.
The other flange 32 is the flange 21 of the vertical seismic isolation device 2,
Each of the horizontal seismic isolation devices 3 is joined to the vertical seismic isolation device 2 by a bolt 6, but the flange 32 on the vertical seismic isolation device 2 side is integrated with the flanges 21 and 22 of the vertical seismic isolation device 2. The seismic isolation device 1 is also manufactured by omitting the bonding and directly bonding the laminated rubber 31 to the flanges 21 and 22.

When the seismic isolation device 1 shown in FIG. 2 is horizontally deformed, the bending moment is linearly distributed throughout the seismic isolation device 1 as shown in FIG. Device 1
Since the bending moment acting on the vertical seismic isolation device 2 located in the axial middle portion of the is small, the transmission of the bending moment between the flanges 21 and 22 is reduced, and the shearing force is transmitted. The 211 and the engaging portion 221 are simply engaged with each other as long as they are horizontally engaged with each other.

In FIGS. 1 and 4, when the plane area of the protrusion 211 is increased and the spring member 23 is installed between the protrusion 211 and the flange 22, the plane area of the protrusion 211 is reduced and the outer circumference thereof is shown in FIGS. An example in which the spring member 23 is arranged in the above will be shown. 1 and 5 show the case where the spring member 23 of the vertical seismic isolation device 2 is a coil spring, and FIGS. 4 and 6 show the case where a disc spring is used.

In the space surrounded by the engaging portion 221 and the protrusion 211, if necessary, as shown in FIG.
A lubricant 7 such as oil or grease is filled for rust prevention.

[0018]

The present invention is as described above, and a vertical seismic isolation device composed of a pair of opposed flanges and a spring material installed therebetween is disposed between two horizontal seismic isolation devices made of laminated rubber. This reduces the transmission of bending moment between the upper and lower flanges of the vertical seismic isolation device, so that it is sufficient if shear force can be transmitted between the protrusion and the engaging part. The structure can be simplified and the design of the vertical seismic isolation device can be facilitated.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where the seismic isolation device is installed between structures.

FIG. 2 is a cross-sectional view showing a horizontal deformation state of the seismic isolation device.

FIG. 3 is a distribution diagram showing bending moments acting on the seismic isolation device in the state of FIG.

FIG. 4 is a cross-sectional view showing a vertical seismic isolation device when a disc spring is used as a spring material.

FIG. 5 is a cross-sectional view showing a vertical seismic isolation device in the case where a spring member is installed on the outer circumference of a protrusion.

FIG. 6 is a sectional view showing a vertical seismic isolation device when a disc spring is used as the spring material of FIG.

FIG. 7 is a sectional view showing a seismic isolation device in which a horizontal seismic isolation device and a vertical seismic isolation device are connected in series.

[Explanation of symbols]

1 ... Seismic isolation device, 2 ... vertical seismic isolation device, 21 ... flange, 211 ... projection, 22 ... flange, 221 ... engaging part,
23 …… Spring material, 3 …… Horizontal seismic isolation device, 31 …… Laminated rubber,
32 ... Flange, 4 ... Lower structure, 5 ... Upper structure, 6 ... Bolt, 7 ... Lubricant.

Claims (1)

[Claims] 1. A pair of opposed flanges and a spring material installed between the flanges. A projection is provided on one of the flanges facing the other flange, and the projection is relatively movable in the vertical direction on the other flange. It is composed of a vertical seismic isolation device with a cylindrical engaging part surrounding it and two horizontal seismic isolation devices made of laminated rubber. The horizontal seismic isolation device is located on both axial sides of the vertical seismic isolation device. A three-dimensional seismic isolation device that is arranged, sandwiches a vertical seismic isolation device from above and below, and is joined to each flange.