JPH09158987A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a base isolation device at a low cost and effectively prevent the damage or collapse of a building by forming multiple lugs on at least one pressure contact face of an elastic member installed between a foundation and a groundsill to damp vibrations. SOLUTION: This base isolation device 10 is constituted of a long plate or a sheet-like elastic member 11, it is installed nearly over the whole length between a foundation 1 buried and executed in the ground of a wooden building and the groundsill 2 of the building executed on the foundation 1, and it is held between the groundsill 2 and the foundation 1 via anchor bolts 3 extended from the foundation 1. Multiple longitudinal protruded strips 12 are protrusively formed along the longitudinal direction of the elastic member 11 on the upper face of the elastic member 11, and multiple cross protruded strips 13 are protrusively formed along the width direction of the elastic member 11 on the lower face of the elastic member 11. The protruded strips 12, 13 three-dimensionally cross each other, and columnar base isolation sections 14 are formed at their intersections. The base isolation sections 14 function as base isolation rubbers, and the vibrations transferred from the foundation 1 to the groundsill 2 side are damped.

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 using a plate-shaped or sheet-shaped elastic member.

[0002]

2. Description of the Related Art Recently, a seismic isolation device has been installed between a foundation and a base,
A technique for preventing damage or collapse of a building by increasing the natural period of the building and absorbing vibration energy due to an earthquake is spreading. As the seismic isolation device, Japanese Patent Laid-Open No. 64-39439 discloses a seismic isolation device including a seismic isolation rubber that elastically deforms with respect to a horizontal load and a damper that plastically deforms during horizontal deformation. Further, in this publication, as a seismic isolation rubber, a hard plate made of a metal plate, a ceramic plate, etc. and a soft plate made of vulcanized rubber, undecided vulcanized rubber, etc. are alternately laminated and provided. ing.

On the other hand, as one of the causes of damage or collapse of a building, there is a decrease in strength and rigidity of the foundation. That is,
The humidity under the floor becomes high and the wood decays, and the wood is damaged by termites and rats, which lowers the strength and rigidity of the base. It is conceivable that a vertical or vertical load will act and cause collapse. For this reason, there are some in which the humidity under the floor is lowered by forced ventilation, and repellents such as termites and rats are injected into the wood constituting the base.

[0004]

In the seismic isolation device described in the above publication, even a relatively large vibration can be efficiently damped, but the structure is complicated, and moreover, it is necessary to provide a plurality of parts between the foundation and the foundation. There is a problem that the overall manufacturing cost becomes high. In addition, it is necessary to select the installation location accurately in order to efficiently isolate the seismic isolation, but the optimal installation location depends on the shape of the house, etc., so the work to determine the installation location was very complicated. Furthermore, the seismic isolation device itself is not provided with the function of preventing termites, rats, etc. from entering the base, and the function of reducing the humidity under the floor. I couldn't prevent it. In other words, even if vibrations during an earthquake or typhoon can be effectively dampened, damage and collapse of the building will be unavoidable if the strength and rigidity of the base are reduced due to damage or decay of the foundation, and the overall implications It was not possible to effectively prevent the damage and collapse of buildings due to earthquakes and typhoons in the area.

An object of the present invention is to provide a seismic isolation device which can be manufactured at low cost, has sufficient seismic isolation performance, can be easily installed on a building, and can effectively prevent damage or collapse of the building. Is to provide.

[0006]

According to a first aspect of the present invention, there is provided a seismic isolation device for mounting a plate-shaped or sheet-shaped elastic member between a foundation and a foundation to damp vibrations from the foundation to the foundation. Then, a plurality of protrusions are formed on at least one of the pressure contact surfaces of the elastic member with respect to the foundation or the base.

The seismic isolation device according to a second aspect is a seismic isolation device which mounts a plate-shaped or sheet-shaped elastic member between a foundation and a foundation to damp vibrations from the foundation to the foundation. A plurality of ridges are formed on the pressure contact surface of the elastic member with respect to each, and the ridges on the base side and the ridges on the base side are three-dimensionally intersected. Here, as described in claim 3, the ridges on one of the pressure contact surfaces are formed along the length direction of the elastic member, and the ridges on the other pressure contact surface are formed along the width direction of the elastic member. According to claim 4, forming an ant return portion for preventing the invasion of ants on the base side on the side part of the elastic member, and in the elastic member, ants, rats, small animals, It is a preferred embodiment that a repellent such as an insect, an insecticide, and a drug such as a pesticide are mixed.

[0008]

In the seismic isolation device according to the first aspect, a plurality of protrusions are formed on at least one of the pressure contact surfaces of the plate-like or sheet-like elastic member mounted between the foundation and the base, and at these protrusion portions. The foundation and the base will be directly connected with almost no gap. That is, each of the plurality of protrusions functions as a seismic isolation rubber, and the vibration that acts on the foundation is efficiently damped by the energy absorbing action due to the deformation of the protrusions. In addition, the inflow and outflow of air to the underfloor side is promoted through the gap between the adjacent protrusions, and the increase of the underfloor humidity is prevented.

In the seismic isolation apparatus according to claim 2, a plurality of ridges are respectively formed on the pressure contact surface of the plate-like or sheet-like elastic member mounted between the foundation and the base, and the ridge on the foundation side and the base are formed. The ridges on the side are arranged so as to intersect three-dimensionally, and the foundation and the base are directly connected to each other at these intersecting portions without a substantial gap. That is, the plurality of intersecting portions of the ridges function as seismic isolation rubbers, respectively, and vibrations acting on the foundation are efficiently damped. Also,
Through the gap between the adjacent ridges, the inflow and outflow of air to the underfloor side is prevented, and the increase in the underfloor humidity is prevented.

Here, as described in claim 3, the ridges on one pressure contact surface are formed along the length direction of the elastic member, and the ridges on the other pressure contact surface are formed along the width direction of the elastic member. When formed, the elastic member can be easily formed, and the flow resistance of air under the floor is reduced. Further, as described in claim 4, by forming the ant return part for preventing the ant from entering the base side on the side part of the elastic member, it is possible to prevent the base lumber from being damaged by the ant and the like eroding. Further, as described in claim 5, when the elastic member is mixed with a repellent such as ants, rats, small animals, insects, insecticides, insecticides, etc., the ants and rats may be eaten or chewed. It is possible to prevent damage to the base wood.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the seismic isolation device 10 includes a long plate-shaped or sheet-shaped elastic member 1
Anchor bolt 3 extending from the foundation 1 that is installed over substantially the entire length between the foundation 1 that is constructed by 1 and is embedded in the ground E of the wooden building and the foundation 2 of the building that is constructed on the foundation 1.
It is held between the base 2 and the foundation 1 via. And
With this seismic isolation device 10, the vibration of the ground E due to an earthquake or the like is transmitted from the foundation 1 to the base 2 side in a damped state. Since the wooden building itself has a general structure, its detailed description is omitted.

As shown in FIGS. 2 and 3, a plurality of vertical cutting projections 12 are formed on the upper surface of the elastic member 11 along the lengthwise direction of the elastic member 11, and on the lower surface of the elastic member 11. A plurality of transverse ridges 13 are formed in a protruding shape along the width direction of the elastic member 11. Both ridges 12, 13 intersect three-dimensionally, and column-shaped seismic isolation parts 14 whose upper and lower ends are in pressure contact with the base 2 and the foundation 1 are formed at the intersections. The seismic isolation part 14 functions as a seismic isolation rubber, so that the vibration from the foundation 1 to the base 2 side is attenuated.

The ridges 12 and 13 may be formed in a number other than that shown in the drawing, or may be formed in a square or trapezoidal cross section. In addition, a plurality of transverse ridges 1 are formed on the upper surface of the elastic member 11.
3 is formed, and a plurality of vertical cutting projections 12 are formed on the lower surface of the elastic member 11.
The ridges 12 and 13 may be formed at an angle to the longitudinal direction of the elastic member 11 or may be formed in a curved shape.

A vertical cutting groove 15 is formed between the vertical cutting ridges 12 extending along the length direction of the elastic member 11.
A transverse groove 16 is formed between the transverse projections 13 extending along the width direction of the No. 1. The transverse groove 16 promotes the circulation of air under the floor, and improves the ventilation under the floor to prevent the wood on the base 2 from decaying due to high humidity under the floor. A lip-shaped dovetail portion 17 is formed on the side of the elastic member 11 over the entire length thereof, and this dovetail portion 17 prevents termites and the like from entering from the foundation 1 to the base 2 side, and It is possible to prevent the strength and the rigidity of the base 2 from being deteriorated due to the wood of No. 2 being eaten by the termites and the like.

The material of the elastic member 11 is natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), isoprene rubber (IR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), butyl rubber. It is possible to employ vulcanized rubber or elastomer such as (IIR) or ethylene propylene rubber (EPDM), or urethane elastomer, silicone elastomer, modified silicone elastomer, or the like. A laminated body of these elastic members, a wire, a fiber or the like embedded therein, or a mixture thereof may be employed. The elastic shear modulus of the elastic member 11 is 2.0 to 25 k.
It is set to gf / cm ² . That is, 2.0 kgf
If it is less than / cm ² , the physical properties of the solid molded product such as hardness and impact resilience are reduced although it is effective for vibration insulation and cushioning, and the strength of the whole structure using this is impaired, resulting in 25 kgf / cm 2. ^If it is larger than ² , the hardness becomes high at the same time, and not only the rubber property is impaired but also the vibration insulating property is lost, so 2.0 to 25 kgf / c
It is set to m ² . The thickness of the elastic member 11 is
If it is too thin, a sufficient seismic isolation effect cannot be obtained, and if it is too thick, the amplitude at the time of vibration becomes large, which causes a problem that the structure is adversely affected, so it is set to 1 to 3 cm.

When the elastic member 11 is molded, chemicals such as repellents such as ants, rats, small animals, and insects, insecticides, and insecticides are mixed into the material, or after the elastic member 11 is molded, its surface is formed. You may form the coating layer which mixed these chemical | medical agents. Examples of the drug include ant-control agents such as deldrin, aldrin, chlordane, and monochloronaphthalene, insecticides such as brodifacoum, bromadioolone, difenafhum, and furocumafen, and bis (dimethylthiocarbamoyl).
Repellents such as disulfide, 1,17-diguanidino-9-azaheptadecane or salts thereof are effective,
Natural products such as wood vinegar and peppermint, or one or a mixture of two or more of these agents can also be used. In this way, when the chemical is mixed in the elastic member 11, the invasion of termites and rats from the foundation 1 to the base 2 side is prevented, and the wood of the base 2 is eaten by the termites or bitten by the rat. The deterioration of the strength and rigidity of the base 2 is prevented in advance.

Although not shown, the seismic isolation section 14 may be provided with a vertically oriented rod-shaped lead damper so as to more effectively damp vibration energy in an earthquake or the like. A space portion may be formed inside 14 and this space portion may function as an air damper.

As shown in FIG. 1, an opening 4 is formed at a proper position of the foundation 1, and a ventilation fan 5 for forcedly ventilating the floor is provided in the opening 4 through a vibration-proof rubber (not shown). There is. The ventilation fan 5 enhances ventilation under the floor and prevents decay of wood such as the base 2 due to high humidity under the floor, and prevents deterioration of strength and rigidity of the wood of the foundation 2 due to decay. To be done.

As described above, the seismic isolation device 10 not only damps vibrations transmitted to the base 2 to prevent adverse effects on the building, but also prevents damage to the base 2 by termites and rats. By improving the ventilation of the underfloor and preventing the base 2 from decaying, the function of preventing the deterioration of the strength and rigidity of the base 2 and preventing the damage of the building due to an earthquake, typhoon, etc. Have

As a modification of the seismic isolation device 10, a plurality of truncated cone-shaped projections 2 are formed on the surface of a long plate-shaped or sheet-shaped elastic member 11A as in the seismic isolation device 10A shown in FIG.
You may use what formed 0. In this case, the plurality of protrusions 20 act as seismic isolation rubber, and it is possible to damp the vibration from the foundation 1 side to the base 2 side. Further, the plurality of protrusions 20 may be provided on the lower surface side of the elastic member 11, or may be provided on the upper surface and the lower surface of the elastic member 11. It is also possible to use a column or prism as the protrusion 20.

[0021]

According to the seismic isolation device of the first aspect, since the seismic isolation device is constituted by the plate-shaped or sheet-shaped elastic member having a plurality of projections, the manufacturing cost of the seismic isolation device is significantly increased. Can be reduced to Further, the vibration from the foundation to the foundation is effectively damped by the plurality of protrusions, and since it is possible to lay the elastic member on the entire upper surface of the foundation, it is possible to obtain sufficient seismic isolation performance. Furthermore, by mounting the base with the elastic member laid on the upper surface of the foundation, the seismic isolation device can be easily constructed. In addition, since the inflow and outflow of air to the underfloor side is promoted through the gap between the adjacent protrusions, the base is prevented from decaying due to high humidity under the floor,
It is possible to prevent buildings from being damaged or collapsed due to vibrations during an earthquake or typhoon.

In the seismic isolation device according to the second aspect, since the seismic isolation device is constituted by a plate-like or sheet-like elastic member in which a plurality of ridges are formed on both sides, the seismic isolation device manufacturing cost is reduced. It can be reduced significantly. In addition, the multiple intersections of the ridges function as seismic isolation rubbers to effectively damp the vibration from the foundation to the foundation, and it is also possible to lay elastic members on the entire upper surface of the foundation, so sufficient isolation is required. It is possible to obtain seismic performance. Furthermore, by mounting the base with the elastic member laid on the upper surface of the foundation, the seismic isolation device can be easily constructed. In addition, since the inflow and outflow of air to the underfloor side is promoted through the gap between the adjacent ridges, the decay of the base due to the high humidity under the floor is prevented, and vibrations during an earthquake or typhoon prevent the building from being damaged. It can be prevented from being damaged or collapsed.

According to the third aspect of the invention, the elastic member can be easily molded, and the air flow resistance to the underfloor side is reduced. Further, when configured as in claim 4, it is possible to further prevent damage to the base lumber due to the infestation of termites, etc., and to further prevent the building from being damaged or collapsed due to vibration during an earthquake or typhoon. Can be prevented. Further, according to the fifth aspect of the present invention, the base wood is prevented from being damaged by the termites, rats, etc., which may eat or bite, and the building may be damaged or collapsed due to vibration during an earthquake or typhoon. Can be prevented more effectively.

[Brief description of the drawings]

[Fig.1] Perspective view of the foundation of a wooden building and the base

FIG. 2 is a perspective view of the seismic isolation device.

[Fig.3] Longitudinal sectional view of the main part of the seismic isolation device

FIG. 4 is a vertical cross-sectional view of a main part of a seismic isolation device according to a modification.

[Explanation of symbols]

 E Ground 1 Foundation 2 Base 3 Anchor bolt 4 Opening 5 Ventilation fan 10 Seismic isolation device 11 Elastic member 12 Longitudinal ridge 13 Cross transverse ridge 14 Seismic isolation part 15 Longitudinal ridge groove 16 Transverse ridge 17 Dovetail part 10A Seismic isolation device 11A Elastic member 20 protrusion

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location E04H 9/02 351 E04H 9/02 351 (72) Inventor Akira Amano 1-26 Okusawa, Setagaya-ku, Tokyo −11

Claims (5)

[Claims] 1. A seismic isolation device that mounts a plate-shaped or sheet-shaped elastic member between a foundation and a foundation to damp vibrations from the foundation to the foundation, and at least a pressure contact surface of the elastic member to the foundation or the foundation. A seismic isolation device with multiple protrusions formed on one side. 2. A seismic isolation device for mounting a plate-shaped or sheet-shaped elastic member between a base and a base to damp vibrations from the base to the base, wherein a plurality of pressure contact surfaces of the elastic member are attached to the base and the base. Each of these ridges is formed, and the ridges on the foundation side and the ridges on the base side intersect three-dimensionally. 3. The seismic isolation system according to claim 2, wherein the ridges on one of the pressure contact surfaces are formed along the length direction of the elastic member, and the ridges on the other pressure contact surface are formed along the width direction of the elastic member. apparatus. 4. The dovetail return part for preventing the invasion of ants to the base side is formed on the side part of the elastic member.
The seismic isolation device described in paragraph. 5. The seismic isolation device according to claim 1, wherein the elastic member is mixed with a repellent such as ants, rats, small animals, and insects, insecticides, insecticides and the like.