JP2001279950A - Lightweight structure seismic base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight structure seismic base isolation device decreasing vertical transfer force as well as horizontal transfer force of an earthquake. SOLUTION: The lightweight structure seismic base isolation device is so constituted that it is made to lie between a bearing board fixed on a footing side and a bearing stand fixed on an upper structural body side and that the horizontal transfer force to the upper structural body is decreased by making the relative displacement of the bearing stand to bearing board in the horizontal direction when the horizontal transfer force exceeding specific level acts on the footing side by the earthquake, and the bearing stand is constituted of a joint body making use of a link mechanism, an elastic body placed on the joint body and a rolling wheel to decrease the vertical transfer force.

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 mainly applied to a light-weight structure such as a detached house building such as a wooden building, a steel frame or a prefabricated building. More specifically, the present invention relates to the above-mentioned seismic isolation device for a lightweight structure, which is configured to reduce the transmission force in the horizontal direction and reduce the transmission force in the vertical direction during an earthquake.

[0002]

2. Description of the Related Art Conventionally, as a seismic isolation device against a horizontal earthquake motion, various types of so-called sliding type bearings and rolling type bearings and those combining these with a restoring mechanism such as an elastic body or a viscoelastic body have been proposed. (Japanese Patent Laid-Open No. 08-1569
7, JP-A-10-085071). However, although these have an excellent effect on reducing the transmission force in the horizontal direction due to the earthquake, the effects on the reduction in the transmission force in the vertical direction have not been sufficient.

Although there are few examples of research and development on seismic isolation devices for such vertical earthquake motion, one end is connected to the lower surface of a gantry fixed to an upper structure via a pin, and a rolling wheel is attached to the other end. A vertical seismic isolation device having a pair of connecting rods connected to each other by a coil spring and a guide for vertical movement has been proposed (Japanese Patent Laid-Open No. 06-12948).
6).

[0004]

However, in the above-described seismic isolation device, the operation of the rolling wheels provided at each end of the pair of connecting rods is not always the same only by the connecting mechanism of the connecting rods. The horizontality of the mount may be impaired. For this reason, in the seismic isolation device, it is essential to attach a vertically movable guide member to the pedestal in order to secure the horizontality of the pedestal. Although there is no description about the connection and the details are unknown, it is considered that the mere superposition alone impairs the smooth seismic isolation operation due to the inclination of the gantry and the application of stress to a part of the connection surface.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a horizontal structure of an upper structure is secured by a displacement absorbing mechanism including a linked body and a rolling wheel linked to each other. An object of the present invention is to provide a seismic isolation device for a lightweight structure that effectively reduces a vertical transmission force due to an earthquake in combination with a mechanism. In addition, the present invention provides a lightweight structure that effectively reduces the transmission force of an earthquake in both the vertical and horizontal directions by combining the displacement absorption mechanism and the damping mechanism with a mechanism that reduces the transmission force in the horizontal direction. It is intended to provide a seismic isolation device for goods.

[0006]

In order to achieve the above object, a seismic isolation device for a lightweight structure according to the first aspect of the present invention includes a support plate fixed to a foundation and a support fixed to an upper structure. When a certain level of horizontal force acts on the foundation side due to an earthquake interposed between the base and the base, the horizontal transfer force to the superstructure is reduced by displacing the support base horizontally relative to the support plate. In the light-weight structure seismic isolation device configured to reduce the force, the bearing base reduces a vertical transmission force by a connecting body using a link mechanism, an elastic body and a rolling wheel disposed on the connecting body. It is characterized by having such a configuration.

According to the first aspect of the present invention, since the distance between the link portion and the end portion of the link is always constant since the link using the link mechanism is used, The horizontal structure of the superstructure is secured,
The movement of the connecting body is ensured by the rolling wheels provided at both ends of the connecting body, and the transmission force in the vertical direction is reduced by the elastic body provided directly or indirectly on the connecting body. Also, in the present invention, since the mechanism for reducing the transmission force in the vertical direction is entirely incorporated in the mechanism for reducing the horizontal direction, the seismic isolation excellent in both the transmission force in the vertical direction and the horizontal direction is achieved. It is effective.

According to a second aspect of the present invention, there is provided the light-weight structure seismic isolation device according to the first aspect, wherein a vertically movable sliding member is provided on a support portion of the light-weight structure seismic isolation device. Since it is provided, the transmission force in the vertical direction can be further reduced.

In the above seismic isolation device having only the structure described in claim 2, the horizontality of the upper structure is ensured because the connecting body using the link mechanism is used. By installing an elastic body or a viscoelastic body on the back surface of the sliding surface of the sliding material as in the lightweight seismic isolation device according to the described invention, a sliding error is allowed in the vertical direction to the sliding surface and the sliding surface is inclined. The operation of the material becomes smoother and exhibits stable seismic isolation characteristics.

According to a fourth aspect of the present invention, there is provided the light-weight structure seismic isolation device according to the first or second aspect, wherein the elastic member or the elastic member is provided in the support portion. Because of the interposition of the viscoelastic body, the displacement in the vertical direction with respect to the surface on which the elastic body or the viscoelastic body is interposed is relaxed, and the dimensional error in the direction perpendicular to the surface with the elastic body or the viscoelastic body interposed Since the inclination of the intervening surface is allowed, the transmission force in the vertical direction is effectively reduced even if the transmission force is applied in all directions.

Further, according to a fifth aspect of the present invention, there is provided a light-weight structure seismic isolation device according to any one of the first to fourth aspects. Because an elastic body or a viscoelastic body is installed between them,
The transmission force in the horizontal direction of the seismic isolation device is further reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing the entire structure of a lightweight structure to which a seismic isolation device according to the present invention is applied. In FIG. 1, A is an upper part of a lightweight material for a detached house such as a wooden building, a steel frame or a prefabricated building. Structure, B
Is a foundation base, and the seismic isolation device C according to the present invention is interposed between the upper structure A and the base foundation B to normally support the load of the upper structure A, and a certain amount or more is provided on the base foundation side. When a vertical force is applied, the relative displacement in the vertical direction between the two members A and B is allowed by a connecting body using a link mechanism in the seismic isolation device C, and when a horizontal force is applied, a bearing in the seismic isolation device C is used. The relative displacement of the base with respect to the support plate allows the relative displacement in the horizontal direction between the two members A and B to reduce the pitching and rolling of the upper structure.

FIG. 2 is a view showing one embodiment of the seismic isolation device C according to the present invention. This seismic isolation device is installed such that a bearing base 2 can be displaced in a horizontal direction with respect to a bearing board 1, and the bearing base 2 is divided into a bearing base upper part 2a and a bearing base lower part 2b, and links with each other therebetween. A connecting body 5 connected by a coil spring 6 is provided with rolling wheels 7 at both ends thereof, and also protrudes upward from an outer guide 11 protruding downward from an upper support base 2a and lower from a lower support base 2b. The inner guide 12 is configured to slide, and a slide plate 2c is provided on the lower surface of the support base lower portion 2b via an elastic body or a viscoelastic body 13, and the support base 2 and the outer peripheral wall of the support board are provided. 1
An elastic body or a viscoelastic body 15 is disposed between the first and fourth members.
In the outer guide 11, a sliding plate is interposed in a portion that slides with the inner guide 12, and an elastic body 11a is provided between the sliding plate and the outer guide 11.

According to the seismic isolation device configured as described above, since the first mechanism for reducing the vertical transmission force of the earthquake uses the linked bodies that are linked to each other and connected by the coil spring, the vertical mechanism is used. No matter how the connecting body moves due to the transmission force in the direction, the seismic isolation effect can be exhibited while maintaining the horizontality of the upper part of the bearing stand. Further, since a guide that allows relative displacement in the vertical direction by sliding with each other is provided as a second mechanism for reducing the transmission force in the vertical direction, the seismic isolation effect due to the sliding friction is exhibited. Since a dimensional error and inclination between the sliding surfaces can be tolerated by the elastic body provided in the guide, a smooth seismic isolation operation can be expected.

According to the seismic isolation device constructed as described above, the sliding type bearing which allows the relative displacement of the bearing base in the horizontal direction with respect to the bearing board as a mechanism for reducing the horizontal transmission force of the earthquake. And a mechanism for restoring the relative displacement by an elastic body or a viscoelastic body provided between the bearing base and the outer peripheral wall of the bearing board. It is effective. In addition, since the elastic body provided at the bottom of the support base allows vertical dimensional errors and surface inclination of the base surface to which the support plate is fixed, stable seismic isolation even if the horizontal surface of the base surface is impaired Demonstrate the characteristics.

FIG. 3 is a view showing one embodiment of the seismic isolation device C according to the present invention. Although the configuration is almost the same as that of FIG. 2, the coil spring 6 is directly connected to the connecting body 5 in FIG. 2, whereas the connecting body 5 and the rolling wheels 7 are connected in FIG.
A gantry 8a and a gantry 8b are provided between the gantry 8a and the gantry 8
a ′, the gantry 8b and the gantry 8b ′ are connected by the coil spring 6,
Further, stoppers 9a and 9 for limiting the spread of the connecting body 7
b. According to this embodiment, the same seismic isolation effect as in FIG. 2 is exerted, and the lower limit height of the connecting body can be set by the stopper, so that the bearing function is not impaired.

FIG. 4 is a view showing one embodiment of the seismic isolation device C according to the present invention. Although the structure is almost the same as that of FIG. 2, the connecting members are connected by a single coil spring in FIG. 2, whereas in FIG. 4, the columns installed on the support base 2 a and the support base 2 b are respectively provided. 10a or support 10b
Are connected by two coil springs. According to this embodiment, in addition to exerting the same seismic isolation effect as described above, the horizontal center of the upper and lower support bases is always ensured because the axis of the connector and the axial center of the seismic isolation device do not shift. And exhibit more stable seismic isolation characteristics.

FIG. 5 is a view showing one embodiment of the seismic isolation device C according to the present invention. Although the configuration is similar to that of FIG. 3, in FIG.
FIG. 5 shows a configuration in which the connecting bodies 5 are stacked in two stages in the vertical direction. In the present embodiment, the same seismic isolation effect as described above is exerted, and since the connecting body has two steps, a large relative displacement in the vertical direction can be taken. Excellent seismic isolation performance. In addition, it is possible to install the linked bodies in three or more steps as long as the seismic isolation characteristics are not impaired.

FIG. 6 is a view showing one embodiment of the seismic isolation device C according to the present invention. 3 is similar to the configuration shown in FIG. 3 except that the stoppers 9 a and 9 b are removed from the configuration shown in FIG. 3 and a coil spring 16 is provided between the gantry 8 and the outer guide 11. In the present embodiment, the same seismic isolation effect as described above is exerted, and in addition, the coil spring provided between the gantry and the guide restricts a certain amount of movement of the coupling body, which is effective for maintenance of the seismic isolation device. is there.

FIG. 7 is a view showing one embodiment of the seismic isolation device C according to the present invention. This embodiment has substantially the same configuration as that of FIG. 6. In FIG. 6, a coil spring is provided between the gantry 8 and the outer guide 11, but in FIG. An elastic body or viscoelastic body 12a and an elastic body or viscoelastic body 17a are provided on the inner guide 12 and the upper surface of the crosspiece 17, respectively, and have the same function as the embodiment shown in FIG.

FIG. 8 is a view showing one embodiment of the seismic isolation device C according to the present invention. This embodiment has a configuration similar to that of FIG. 2, but a mechanism for restoring the relative displacement of the bearing base in the horizontal direction is an elastic body or viscoelastic body 15 connecting the bearing base 5 and the outer peripheral portion of the support board 1 in FIG. 8 is different from that shown in FIG. 8 in that it is constituted by a laminated rubber 18 provided between the outer peripheral portion of the support base 5 and the outer peripheral portion of the support plate 1. A restoration effect equal to or greater than that of the illustrated embodiment can be obtained.

FIG. 9 is a view showing one embodiment of the seismic isolation device C according to the present invention. In this practical mode, the outer guide 11 and the inner guide 12 slide over the entire circumference in FIG. 2, while the sliding surface of the guide in FIG. It is configured to be partial.

FIG. 10 is a view showing one embodiment of the seismic isolation device C according to the present invention. In the embodiment of FIG. 2, a pair of connecting bodies 5 are provided on the support base 2, whereas in the embodiment of FIG.
Is different. According to the present embodiment, since a plurality of connecting bodies are installed, the horizontality of the upper structure is further secured as compared with FIG. 2, and more stable seismic isolation characteristics can be obtained.

In the above description of the embodiment, the case where the coil spring is connected to the connecting body in the horizontal direction has been described. However, the coil spring is connected in the vertical direction, or the torsion spring is interposed at the link portion of the connecting body. It is also possible. Further, a rod-shaped rubber elastic body or the like may be used instead of the coil spring.

Although the sliding type bearing has been described as a mechanism for allowing relative displacement in the horizontal direction, the present invention can also be applied to a rolling type bearing.

[0026]

As described above, according to the present invention, in a seismic isolation device having a sliding-type bearing or a rolling-type bearing, the upper part of the bearing is joined to the lower part of the bearing by a connecting body using a link mechanism. Because of this configuration, it is possible to provide a light-weight seismic isolation device that achieves not only attenuation of the transmission force in the horizontal direction but also attenuation of the transmission force in the vertical direction.

Further, in the present invention, since a vertically movable sliding member is interposed between the support base and the support plate, the transmission force in the vertical direction can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the entire configuration of a structure to which a seismic isolation device according to the present invention is applied.

FIG. 2 is a diagram of a first embodiment of a seismic isolation device according to the present invention.

FIG. 3 is a diagram of a second embodiment of the seismic isolation device according to the present invention.

FIG. 4 is a diagram of a third embodiment of the seismic isolation device according to the present invention.

FIG. 5 is a diagram of a fourth embodiment of the seismic isolation device according to the present invention.

FIG. 6 is a diagram of a fifth embodiment of the seismic isolation device according to the present invention.

FIG. 7 is a view of a sixth embodiment of the seismic isolation device according to the present invention.

FIG. 8 is a diagram of a seventh embodiment of the seismic isolation device according to the present invention.

FIG. 9 is an eighth embodiment diagram of the seismic isolation device according to the present invention.

FIG. 10 is a view of a ninth embodiment of the seismic isolation device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bearing board 2 Bearing base 2a Bearing base upper part 2b Bearing base lower part 3a Bearing base upper lower surface groove 3b Bearing base lower upper surface groove 5 Connecting body 5a Connecting part (link part) 6 Coil spring 7 Rolling wheel 8 Mounting 8a Upper mounting 8b Lower mounting Reference Signs List 9 stopper 9a upper stopper 9b lower stopper 10 support 10a upper support 10b lower support 11 outer guide 11a outer guide inner elastic body (or viscoelastic body) 12 inner guide 12a inner guide upper end elastic body (or viscoelastic body) 13 support base Internal elastic body (or viscoelastic body) 14 Outer peripheral wall of support plate 15 Elastic body or viscoelastic body 16 Coil spring 17 Inner guide bar 17a Inner guide bar upper elastic body (or viscoelastic body) 18 Laminated rubber A Upper structure B Base Basic C seismic isolation device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J048 AA03 AC05 AD14 BC02 BD08 BE12 BE14 BE20 BG04 DA01 EA38

Claims (5)

[Claims] 1. When a horizontal force exceeding a certain level acts on a foundation side due to an earthquake and is interposed between a base plate fixed to a base side and a base plate fixed to a superstructure side, the above-mentioned base is fixed to the base plate. A light-weight structure seismic isolation device configured to reduce horizontal transmission force to an upper structure by relatively displacing in a horizontal direction by using a connecting mechanism that uses a link mechanism. A seismic isolation device for a light-weight structure, wherein a vertical transmission force is reduced by an elastic body and a rolling wheel disposed on the body. 2. The bearing system according to claim 1, wherein said bearing base is provided with a guide having a sliding member movable in a vertical direction in addition to a connecting body utilizing a link mechanism, an elastic body and a rolling wheel disposed on said connecting body. The seismic isolation device for a lightweight structure according to claim 1, wherein the seismic isolation device is configured to reduce a transmission force of the light. 3. The seismic isolation device for a lightweight structure according to claim 2, wherein an elastic body or a viscoelastic body is provided on the back surface of the sliding surface of the guide middle sliding material. 4. The bearing according to claim 1, wherein an elastic body or a viscoelastic body is interposed between the vertical transmission force reduction mechanism and the horizontal transmission force reduction mechanism in the support base. Seismic isolation device for lightweight structures. 5. A structure in which an elastic body or a viscoelastic body provided between the outer peripheral portion of the bearing board and the bearing base restores the horizontal displacement of the bearing base relative to the bearing board. The seismic isolation device for a lightweight structure according to any one of claims 1 to 4, wherein