JP3312268B2 - Light load seismic isolation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a light-load seismic isolation device.

[0002]

2. Description of the Related Art As a seismic isolation device, a device having a configuration as shown in FIG. 8 has already been developed and applied for.

As shown in FIG. 8, this apparatus comprises a plurality of hard plate members 90 arranged vertically at intervals, an elastic body 91 disposed between the hard plate members 90, 90, and the hard plate member 90. The upper and lower surfaces of the elastic body 91 are fixed to the hard plate members 90 facing the body, respectively, and the bearing 92 and the hard plate members 90, 90 are fixed to each other. One of the body surfaces 90 and 90 is relatively immovable, and the other is slidable. Here, as a means for allowing the bearing 92 and the hard plate 90 to slide, a sliding member 93 such as Teflon is used.

The above-mentioned device is used so as to be installed between the structure A and the ground-side foundation body B. When horizontal vibrations are generated on the ground side in this use state, as shown in FIG. The elastic body 91 undergoes shear deformation while the 92 slides with respect to the hard plate member 90, and the entire apparatus is brought into a shear deformation state, whereby vibration energy is absorbed. On this occasion,
Since the load of the structure is received by the bearing 92, the device does not buckle. Therefore, when this device is used, vibration energy can be reduced and buckling does not occur.

However, the above-mentioned sliding member 93 such as Teflon exhibits a low friction coefficient when the relative movement between the bearing 92 and the hard plate 90 is low, but has a friction coefficient of 0. 0 at a high speed of 50 cm / sec due to seismic motion. In many cases, the value is 15 or more. In such a case, a phenomenon occurs in which the yielding shear force of the entire device is increased and the sufficient seismic isolation effect is not exhibited.

As one means for solving this problem, in the above seismic isolation device, the length of the elastic body 91 in the vertical direction is supported.
Structure A and ground-side foundation B
It is conceivable to apply a compressive force to the elastic body 2 in the vertical direction in a state where the elastic body 2 is installed between them (this has also been filed). When this means is adopted, the elastic body 91 bears a part of the weight of the structure A, and the weight of the structure A carried by the bearing 92 is reduced, whereby the sliding between the hard plate 1 and the bearing 3 is achieved. The frictional force of the moving part can be reduced. Therefore, even if an earthquake (horizontal vibration) occurs in which the structure A and the ground-side foundation B move relatively at high speed, the yield shear force of the entire apparatus becomes small, and the vibration energy can be sufficiently reduced.

However, this seismic isolation device has a problem that when the weight of the structure A changes, the seismic isolation performance greatly changes. This is because when the weight on the side of the structure A changes, the weight sharing ratio of the bearing 92 changes greatly, and the yielding shear force of the seismic isolation device changes greatly.

[0008]

Therefore, according to the present invention, even if the weight of the structure side changes, the seismic isolation performance does not extremely change, and the structure and the ground-side foundation move relatively at high speed. It is an object of the present invention to provide a light-load seismic isolation device that can sufficiently reduce vibration energy even when a severe earthquake (horizontal vibration) occurs and does not cause buckling.

[0009]

According to the first aspect of the present invention,
A light-load seismic isolation device formed by stacking a plurality of unit seismic isolation devices U on top of one another, wherein the unit seismic isolation device U comprises a pair of hard plate members 1a arranged vertically at intervals. An elastic body 2 disposed between the hard plate members 1a, 1a;
The upper and lower surfaces of the elastic body 2 are fixed to the facing hard plate members 1a, 1a, respectively, and the support 3 and the hard plate members 1a, 1a are fixed to each other. One of the facing portions is relatively immovable, and the other is slidable.
Is made of an elastic body so that it can be compressed and deformed in the vertical direction.

According to a second aspect of the present invention, there is provided a light-load seismic isolation device according to the first aspect, wherein the elastic body 2 is formed in an annular shape in a sectional view, and a bearing 3 is provided inside the elastic body 2. Are located.

A light-load seismic isolation device according to a third aspect of the present invention is related to the first aspect of the invention, wherein a plurality of elastic bodies 2 are arranged so as to surround the bearing 3.

According to a fourth aspect of the present invention, there is provided the light-load seismic isolation device according to the first aspect, wherein the bearing 3 is formed in an annular shape in a sectional view, and the elastic body 2 is disposed inside the bearing 3. Have been.

According to a fifth aspect of the present invention, there is provided the light-load seismic isolation device according to the first aspect of the present invention, wherein a plurality of bearings 3 are arranged so as to surround the elastic body 2.

According to a sixth aspect of the present invention, there is provided the light-load seismic isolation device according to any one of the first to fifth aspects, wherein the seismic isolation device is installed between the structure A and the ground-side foundation B. , A compressive force is applied to the elastic body 2 in the vertical direction.

In the light-load seismic isolation device of the present invention, when a horizontal vibration is generated on the ground side, the bearing 3 slides against the hard plate 1 and the elastic body 2 is sheared to deform the entire device. It is in a deformed state, whereby vibration energy is absorbed. At this time, since the load of the structure is received by the bearing 3, buckling does not occur in the device.

Further, it has an excellent function that the allowable shear deformation amount and the height of the device can be freely changed as required.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. (Reference Embodiment 1) As shown in FIG. 1, this light-load seismic isolation device is installed between a lightweight structure A for a detached house and a ground-side foundation B, and is basically the same as that shown in FIG. As shown in FIG. 2 and FIG. 2, a plurality of hard plate members 1 arranged vertically and spaced apart from each other, an annular bearing 3 arranged between the hard plate members 1, 1 and the hard plate members 1, 1
Elastic bodies 2 located between each other and in the interior space of bearing 3
It is composed of In this embodiment, the upper and lower surfaces of the elastic body 2 are fixed to the hard plate materials 1 and 1 facing each other, and the bearing 3 has its upper surface fixed to the lower hard plate material 1 so as to be relatively immovable. The lower surface is slidable with respect to the upper hard plate 1.

As shown in FIG. 2, the hard plate 1 is made of a stainless steel plate (stained with a sword) formed in a circular shape in a plan view. A plurality of bolt insertion holes (not shown) are formed.

As shown in FIGS. 1 and 2, the elastic body 2 is formed of a columnar rubber material.
Natural rubber, isoprene rubber, styrene rubber, urethane rubber, silicon rubber, etc. can be used. Further, a so-called high damping rubber (having a spring element of rubber molecules, a friction element in which molecules rub against each other, and a viscous damping element) A rubber material having a high absorption rate of vibration energy due to a synergistic effect of these elements can be used.

As shown in FIG. 1, the bearing 3 is composed of an annular synthetic resin body 30 and an annular alilator 31 (a rubber plate and a steel plate alternately laminated and fixed) arranged below the annular synthetic resin body 30. In this embodiment, the sliding member 4 such as Teflon is attached to the lower surface of the sliding member 4 in this embodiment.

Since the light-load seismic isolation device has the above-described configuration, it has the following functions.

In this device, since the bearing 3 is composed of the synthetic resin body 30 and the isolator 31, a part of the weight of the structure A is elastically elastic in the installed state between the structure A and the ground-side foundation B. The body 2 is in the state of being held, and the weight of the structure A that is supported by the bearing 3 is reduced. Therefore,
The frictional force of the sliding portion between the hard plate 1 and the bearing 3 via the sliding member 4 becomes small, and an earthquake (horizontal vibration) in which the ground-side foundation A and the structure B relatively move at high speed is caused. Even if it occurs, the increase in the yield shear force of the entire apparatus is suppressed.

Here, in this apparatus, the state shown in FIG.
During the shear deformation in the state of (1), the bearing 3 mainly has the function of absorbing the horizontal vibration energy by friction with the hard plate 1 while receiving the load of the structure A. On the other hand, the elastic body 2 mainly has the elastic restoring force shown in FIG. The function of returning to the state shown in FIG. Then, in this device, the weight sharing ratio of the bearing 3 to the weight of the entire structure A is less likely to change as compared with the latter device described in the section of the prior art. Even when the weight changes, the yielding shear force of the seismic isolation device does not change significantly.

Therefore, in this seismic isolation device, the structure A
Even if the side weight changes, the seismic isolation performance does not change extremely, and even if an earthquake (horizontal vibration) occurs in which structure A and ground-side foundation B move relatively at high speed, vibration energy Can be sufficiently reduced, and the buckling phenomenon does not easily occur.

The bearing 3 may have a structure in which the lower surface is fixed to the upper hard plate 1 so as not to be relatively movable and the lower surface is slidable with respect to the upper hard plate 1. (Reference Embodiment 2) As shown in FIG. 4, this light-load seismic isolation device has a plurality of hard plate members 1 arranged vertically at intervals and a circle arranged between the hard plate members 1. It comprises an annular elastic body 2 and a bearing 3 disposed in the internal space of the elastic body 2 between the hard plate materials 1 and 1. The upper and lower surfaces of the elastic body 2 are fixed to the facing hard plate members 1, 1 respectively, and the upper portion of the facing portion between the bearing 3 and the hard plate members 1, 1 is relatively immovable, while the lower portion is slid. Possible
Each is done. The hard plate 1, the elastic body 2, the bearing 3, and the sliding member 4 can be made of the same material as in the first embodiment. (Embodiment 1) As shown in Fig. 5, this light-load seismic isolation device is formed by bolting a plurality of unit seismic isolation devices U in an up-and-down manner.

As shown in FIG. 5, the unit seismic isolation device U is composed of a pair of hard plate members 1a vertically arranged at intervals and an annular elastic member 2 disposed between the hard plate members 1a. And an elastic body 2 between the hard plate members 1a, 1a.
And a bearing 3 arranged in the internal space of the vehicle.

The hard plate 1a is the hard plate 1 of the first embodiment.
5, and a bolt insertion hole is formed in the vicinity of the outer circumference circle as shown in FIG.

The elastic body 2, the bearing 3, and the sliding member 4 are exactly the same as those provided between the hard plate materials 1, 1 in the second embodiment.

Here, the upper and lower surfaces of the elastic body 2 are fixed to the hard plates 1a, 1a facing each other, and the lower surface of the facing portions of the bearing 3 and the hard plates 1a, 1a is fixed so as to be relatively immovable. And the upper surface is slidable,
I have done each.

Therefore, when a plurality of unit seismic isolation devices U are vertically stacked and bolted, the seismic isolation device has substantially the same structure as that of the first embodiment, has the same function, and has an allowable shear deformation amount. And the height of the device can be freely changed as needed. (Embodiment 2) This light-weight seismic isolation device is the seismic isolation device of Reference Embodiment 2 shown in FIG.
As shown in FIG. 6, a plurality of unit seismic isolation devices U are formed so as to be bolted in such a manner that they are vertically stacked. The elastic body 2, the bearing 3, and the sliding member 4 are formed as shown in FIG. In FIG. 1, exactly the same material as that provided between the hard plate materials 1, 1 is used. (Embodiment 3) The elastic body 2 of the above embodiment can be replaced with a plurality of columnar elastic bodies 2 surrounding the bearing 3, as shown in FIG.

Similarly, the bearing 3 of the above-described embodiment can be replaced with a plurality of columnar bearings 3 surrounding the elastic body 2.

In the seismic isolation device of the above-described embodiment, the elastic member 2 may be formed by alternately stacking and fixing rubber plates and steel plates.

Further, with respect to the seismic isolation device of the above-described embodiment, the elastic member 2 is manufactured to be longer than the bearing 3, and the device is installed between the structure A and the ground-side foundation B. May apply a compressive force to the elastic body 2 in the vertical direction. In this case, the yielding shear force of the seismic isolation device can be easily set.

[0034]

Since the present invention has the above configuration, the following effects are obtained.

As is clear from the contents described in the section of the means for solving the problems, even when the weight of the structure side changes, the seismic isolation performance does not change extremely, and the structure and the ground-side foundation are not changed. Even when an earthquake (horizontal vibration) that causes relative movement at high speed occurs, vibration energy can be sufficiently reduced, and a light-load seismic isolation device that does not cause buckling can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state in which a light-load seismic isolation device of Reference Embodiment 1 is installed between a structure and a ground-side foundation.

FIG. 2 is a cross-sectional view of the light-load seismic isolation device in a horizontal direction.

FIG. 3 is a sectional view showing a state of the light-load seismic isolation device when horizontal vibration acts on a ground-side foundation.

FIG. 4 is a cross-sectional view illustrating a state where the light-load seismic isolation device of Reference Embodiment 2 is installed between a structure and a ground-side foundation.

FIG. 5 is a sectional view of the light-load seismic isolation device according to the first embodiment of the present invention.

FIG. 6 is a sectional view of a light-load seismic isolation device according to a second embodiment of the present invention.

FIG. 7 is a sectional view illustrating a light-load seismic isolation device according to a third embodiment of the present invention.

FIG. 8 is a sectional view showing a state in which a conventional light-load seismic isolation device is installed between a structure and a ground-side foundation.

FIG. 9 is a cross-sectional view showing a state of a conventional light-load seismic isolation device when horizontal vibration acts on a ground-side foundation.

[Explanation of symbols]

 U unit seismic isolation device 1a Hard plate material 2 Elastic body 3 Bearing

Claims (6)

(57) [Claims] 1. A light-load seismic isolation device formed by stacking a plurality of unit seismic isolation devices (U) one above the other, wherein the unit seismic isolation devices (U) are vertically spaced apart from each other. A pair of hard plate members (1a) arranged, and the hard plate members (1a) (1
a) An elastic body (2) arranged between them, and a support (3) arranged between the hard plate materials (1a) and (1a), and upper and lower surfaces of the elastic body (2) face each other. And one of the facing portions of the bearing (3) and the hard plate (1a) (1a) is relatively immovable, and the other is slidable. A light-load seismic isolation device characterized in that a portion of the bearing (3) is made of an elastic body so that it can be compressed and deformed in the vertical direction. 2. The light load according to claim 1, wherein the elastic body (2) is formed in an annular shape in a sectional view, and a bearing (3) is disposed inside the elastic body (2). For seismic isolation device. 3. A light-weight seismic isolation device according to claim 1, wherein a plurality of elastic bodies (2) are arranged so as to surround the bearing (3). 4. The light-load bearing according to claim 1, wherein the bearing (3) is formed in an annular shape in a sectional view, and an elastic body (2) is disposed inside the bearing (3). Seismic isolation device. 5. The light-load seismic isolation device according to claim 1, wherein a plurality of bearings (3) are arranged so as to surround the elastic body (2). 6. A compression force is applied to the elastic body (2) in a vertical direction when installed between the structure (A) and the ground-side foundation (B). The light-load seismic isolation device according to any one of claims 1 to 5.