JP3825923B2 - Seismic isolation device - Google Patents

Seismic isolation device Download PDF

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Publication number
JP3825923B2
JP3825923B2 JP24685398A JP24685398A JP3825923B2 JP 3825923 B2 JP3825923 B2 JP 3825923B2 JP 24685398 A JP24685398 A JP 24685398A JP 24685398 A JP24685398 A JP 24685398A JP 3825923 B2 JP3825923 B2 JP 3825923B2
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Japan
Prior art keywords
seismic isolation
isolation device
sliding
upper structure
rubber
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Expired - Fee Related
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JP24685398A
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JP2000073617A (en
Inventor
正見 大串
裕之 宮出
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Yokohama Rubber Co Ltd
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Yokohama Rubber Co Ltd
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Description

【０００１】
【発明の属する技術分野】
この発明は、免震装置にかかわり、更に詳しくは一戸建て住宅や集合住宅等の一般住宅等に利用する免震装置に関するものである。
【０００２】
【従来の技術】
従来、ビル，アパート及び橋梁等のコンクリート構造物にして使用されている免震装置には、複数枚の鋼板とゴム板とを交互に積層させた積層ゴムタイプの免震装置、ボールベアリングを用いた転がり型の滑り免震装置、積層ゴムと滑り免震装置とを併用した免震装置等が知られている。
【０００３】
【発明が解決しようとする課題】
然しながら、上記のような積層ゴムタイプの免震装置は、鉛直荷重が大きい構造物で、かつＧが3.5 〜4.5 kgf/cm2程度のものであるため、このような免震装置を、比較的鉛直荷重が小さい一戸建て住宅や集合住宅等の一般住宅等に採用した場合には、Ｇが１〜２kgf/cm2程度の地震に対して対応することが難しい。
【０００４】
また、積層ゴムタイプのみを使用した免震装置では、座屈し易く、また転がり型の滑り免震装置の場合には、ボールベアリング等の錆の発生により長期安定性に欠け、更に滑り免震装置の場合には、積層ゴムと併用するために、施工の自由度やコンパクト性に欠けると言う問題があった。
この発明の目的は、構造物の鉛直荷重を確実に支持できるとともに、クリープによる変動は無く、更に低い剪断弾性係数に対しても対応することが出来る免震装置を提供することにある。
【０００５】
【課題を解決するための手段】
この発明は上記目的を達成するため、上部構造物と下部構造物との間に滑り支承体を設け、この滑り支承体の周囲に所定の間隔を隔てて、前記上部構造物と下部構造物とを連結する帯状のゴム状弾性体から成る復元部材を配設し、前記復元部材の外側の上部構造物と下部構造物とに、過大変位防止部材を設けたことを要旨とするものである。
この発明は、上記のように構成され、上部構造物と下部構造物とに、滑り支承体を囲むように所定の間隔で帯状のゴム状弾性体から成る復元部材を連結することで、鉛直荷重が比較的小さい一戸建て住宅や集合住宅等の一般住宅等に採用しても鉛直荷重を確実に支持できるとともに、クリープによる変動は無く、更に低い剪断弾性係数に対しても復元性のあるゴム状弾性体を使用することで対応することが出来るものである。
【０００６】
また、復元部材の外側に、過大変位防止部材を設けることで、復元部材の破損等も防止することが出来る。
【０００７】
【発明の実施の形態】
以下、添付図面に基づき、この発明の実施形態を説明する。
図１は、この発明を実施した免震装置の平面図、図２は図１の正面図を示し、前記免震装置は、建物等の上部構造物１とコンクリート基礎等の下部構造物２との支持板１ａ，２ａ間には、防錆力の高い金属材料から成る滑り支承体３が設けてあり、この滑り支承体３の周囲には、前記上部構造物１と下部構造物２との支持板１ａ，２ａを連結する帯状のゴム状弾性体から成る復元部材４が配設してある。
【０００８】
前記上部構造物１の支持板１ａには、防錆力の高い金属材料、例えば、ステンレス等の滑り部材５が設けてあり、また滑り支承体３の上面の摺動面には、予め表面にテフロン樹脂等のフッ素系樹脂を焼き付け処理した金属板から成る滑り部材６が設けてある。
また、復元部材４は、上述したように帯状のゴム状弾性体で構成され、滑り支承体３の周囲に所定の間隔を隔てて配設されている。この滑り支承体３の外径及び本数は、上部構造物１の垂直荷重及び地震時のＧに対して設定するもので、例えば、この実施形態では、一般住宅の上部構造物１の荷重５０ton に対して１０個設け、鉛直荷重は復元部材４の１個当たり５ton に設定してある。なお、この場合、水平方向には、１Ｇがかかると仮定する。
【０００９】
また、前記復元部材４の外側の上部構造物１と下部構造物２との支持板１ａ，２ａには、チェーン，ワイヤーロープ等の帯状部材から成る過大変位防止部材７が設けてある。この過大変位防止部材７によって、復元部材４に過度の剪断変形が作用した場合に、損傷等を防止するものである。
以上のように、滑り支承体３の周囲に、上部構造物１と下部構造物２との支持板１ａ，２ａを連結する帯状のゴム状弾性体から成る復元部材４を所定の間隔で連結して配設することで、図３のように地震等により上部構造物１が滑り支承体３を水平方向（Ｘ方向）にスライドして復元部材４が剪断変形を受けた場合にも、復元部材４の弾性復元力により元の状態に復元できるものである。
【００１０】
また、過度の変形に対しては、過大変位防止部材７によって、損傷等を防止するものである。
次に、この発明の実施例を説明する。
この発明の実施形態のように、上部構造物の荷重５０ton 、復元部材を１０個設けた場合を仮定した場合、鉛直荷重（Ｗ）は復元部材の１個当たり５ton となる。
【００１１】
▲１▼．１Ｇの水平力が載荷されると仮定して、滑り面の摩擦係数（μ）0.1 を考慮した１支承当たりの作用水平力（Ｐ）は、( Ｐ＝Kh×Ｗ−F ) の式で求めることが出来る。
Ｐ＝1.0 ×5 −0.1 ×5 ＝4.5 (tf)
Kh ：水平震度， Ｗ：鉛直荷重，すべり摩擦力（Ｆ）＝μＷ
▲２▼. 復元部材としてのゴム材料は、天然ゴム（ＮＲ）を使用する。
Ｇは１０kgf/cm2 相当品を使用し、直径（φ）60mm, 長さ（Ｌ）150 mm,
本数(n)10 本のゴムばねは、Ｅ＝30kgf/cm2 より、

Figure 0003825923
▲３▼．水平方向に２０cm移動したと仮定した時のゴム歪みは、167%(10cm 伸びる)
▲４▼. ゴムの張力は、5.65tf (水平方向に4.52tf)
▲５▼. 従って、4.52＞4.5 tf で十分である。
【００１２】
【発明の効果】
この発明は、上記のように上部構造物と下部構造物との間に滑り支承体を設け、この滑り支承体の周囲に所定の間隔を隔てて、前記上部構造物と下部構造物とを連結する帯状のゴム状弾性体から成る復元部材を配設し、前記復元部材の外側の上部構造物と下部構造物とに、過大変位防止部材を設けたので、構造物の鉛直荷重を確実に支持できるとともに、クリープによる変動は無く、更に低い剪断弾性係数に対しても対応することが出来るコンパクトな免震装置とすることが出来る効果がある。
【図面の簡単な説明】
【図１】この発明を実施した免震装置の平面図である。
【図２】図１の正面図である。
【図３】免震装置の変形状態を示す説明図である。
【符号の説明】
１ 上部構造物 １ａ 支持板
２ 下部構造物 ２ａ 支持板
３ 滑り支承体 ４ 復元部材
５ 滑り部材 ６ 滑り部材
７ 過大変位防止部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic isolation device, and more particularly to a seismic isolation device used for a general house such as a detached house or an apartment house.
[0002]
[Prior art]
Conventional seismic isolation devices used for concrete structures such as buildings, apartments, and bridges use laminated rubber type seismic isolation devices in which multiple steel plates and rubber plates are laminated alternately, and ball bearings. Rolling-type sliding seismic isolation devices, seismic isolation devices using laminated rubber and sliding seismic isolation devices are known.
[0003]
[Problems to be solved by the invention]
However, the laminated rubber type seismic isolation device as described above is a structure having a large vertical load and G is about 3.5 to 4.5 kgf / cm 2. When it is adopted for a single-family house or an apartment house with a small vertical load, it is difficult to cope with an earthquake having a G of 1 to 2 kgf / cm 2 .
[0004]
In addition, the seismic isolation device using only the laminated rubber type is easy to buckle, and in the case of a rolling-type sliding seismic isolation device, it lacks long-term stability due to the occurrence of rust such as ball bearings. In this case, since it is used together with laminated rubber, there is a problem that the degree of freedom in construction and compactness are lacking.
An object of the present invention is to provide a seismic isolation device that can reliably support a vertical load of a structure, is not subject to fluctuation due to creep, and can cope with a lower shear elastic modulus.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a sliding support between the upper structure and the lower structure, and the upper structure and the lower structure are separated from each other at a predetermined interval around the sliding support. The present invention is characterized in that a restoring member made of a rubber-like elastic body is connected to each other, and an excessive displacement preventing member is provided on the upper structure and the lower structure outside the restoring member. .
The present invention is configured as described above, and a vertical load is obtained by connecting a restoring member made of a rubber elastic body in a band shape at a predetermined interval so as to surround the sliding support body to the upper structure and the lower structure. Even if it is adopted in a single-family house or an apartment house such as a relatively small size, it can reliably support vertical loads, and it does not fluctuate due to creep. It can be handled by using the body.
[0006]
Further, by providing an excessive displacement preventing member outside the restoring member, it is possible to prevent the restoring member from being damaged.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view of a seismic isolation device embodying the present invention, FIG. 2 is a front view of FIG. 1, and the seismic isolation device includes an upper structure 1 such as a building and a lower structure 2 such as a concrete foundation. Between the support plates 1a and 2a, there is provided a sliding support 3 made of a metal material having a high rust-preventing power. Around the sliding support 3, the upper structure 1 and the lower structure 2 are provided. A restoring member 4 made of a band-like rubber-like elastic body for connecting the support plates 1a and 2a is provided.
[0008]
The support plate 1a of the upper structure 1 is provided with a sliding member 5 made of a metal material having a high rust-preventing power, for example, stainless steel. A sliding member 6 made of a metal plate obtained by baking a fluororesin such as Teflon resin is provided.
Further, the restoring member 4 is formed of a belt-like rubber-like elastic body as described above, and is disposed around the sliding support body 3 with a predetermined interval. The outer diameter and the number of the sliding bearings 3 are set with respect to the vertical load of the upper structure 1 and G at the time of earthquake. For example, in this embodiment, the load of the upper structure 1 of a general house is 50 tons. In contrast, 10 are provided, and the vertical load is set to 5 tons per one restoring member 4. In this case, it is assumed that 1G is applied in the horizontal direction.
[0009]
Further, on the support plates 1a and 2a of the upper structure 1 and the lower structure 2 outside the restoring member 4, an excessive displacement prevention member 7 made of a belt-like member such as a chain or a wire rope is provided. This excessive displacement prevention member 7 prevents damage and the like when excessive shear deformation is applied to the restoring member 4.
As described above, the restoring member 4 made of a band-like rubber-like elastic body for connecting the support plates 1a and 2a of the upper structure 1 and the lower structure 2 is connected around the sliding support body 3 at a predetermined interval. 3, even when the upper structure 1 slides the sliding support body 3 in the horizontal direction (X direction) due to an earthquake or the like and the restoring member 4 undergoes shear deformation as shown in FIG. 4 can be restored to its original state by the elastic restoring force of 4.
[0010]
Further, the excessive displacement prevention member 7 prevents damage and the like against excessive deformation.
Next, examples of the present invention will be described.
Assuming that the load of the upper structure is 50 tons and ten restoring members are provided as in the embodiment of the present invention, the vertical load (W) is 5 tons per restoring member.
[0011]
(1). Assuming that a 1G horizontal force is loaded, the acting horizontal force (P) per bearing considering the friction coefficient (μ) 0.1 of the sliding surface is obtained by the equation (P = Kh × WF). I can do it.
P = 1.0 × 5 −0.1 × 5 = 4.5 (tf)
Kh: horizontal seismic intensity, W: vertical load, sliding friction force (F) = μW
(2) Natural rubber (NR) is used as the rubber material as the restoring member.
G uses 10 kgf / cm 2 equivalent diameter (phi) 60 mm, a length (L) 0.99 mm,
The number (n) of 10 rubber springs is E = 30kgf / cm 2 ,
Figure 0003825923
(3). Assuming that it has moved 20cm in the horizontal direction, the rubber strain is 167% (extends 10cm)
▲ 4 ▼. Rubber tension is 5.65tf (4.52tf in the horizontal direction)
(5) Therefore, 4.52> 4.5 tf is sufficient.
[0012]
【The invention's effect】
According to the present invention, as described above , the sliding support is provided between the upper structure and the lower structure, and the upper structure and the lower structure are connected to each other at a predetermined interval around the sliding support. Since a restoring member made of a rubber-like elastic body is disposed, and an excessive displacement prevention member is provided on the upper structure and the lower structure outside the restoring member, the vertical load of the structure is reliably ensured. There is an effect that it is possible to provide a compact seismic isolation device that can be supported, has no fluctuation due to creep, and can cope with a lower shear modulus.
[Brief description of the drawings]
FIG. 1 is a plan view of a seismic isolation device embodying the present invention.
FIG. 2 is a front view of FIG. 1;
FIG. 3 is an explanatory view showing a deformed state of the seismic isolation device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Superstructure 1a Support plate 2 Lower structure 2a Support plate 3 Sliding support body 4 Restoring member 5 Sliding member 6 Sliding member 7 Excessive displacement prevention member

Claims (4)

上部構造物と下部構造物との間に滑り支承体を設け、この滑り支承体の周囲に所定の間隔を隔てて、前記上部構造物と下部構造物とを連結する帯状のゴム状弾性体から成る復元部材を配設し、前記復元部材の外側の上部構造物と下部構造物とに、過大変位防止部材を設けて成る免震装置。A sliding bearing is provided between the upper structure and the lower structure, and a belt-like rubber-like elastic body that connects the upper structure and the lower structure with a predetermined interval around the sliding bearing. A seismic isolation device in which an over-displacement prevention member is provided on an upper structure and a lower structure outside the restoration member. 前記過大変位防止部材が、チェーンまたはワイヤーロープから成る帯状部材である請求項１に記載の免震装置。The seismic isolation device according to claim 1, wherein the excessive displacement prevention member is a belt-like member made of a chain or a wire rope. 前記上部構造物の支持板に、防錆力の高い滑り部材を設けた請求項１または２に記載の免震装置。The seismic isolation device according to claim 1 or 2, wherein a sliding member having a high rust prevention power is provided on the support plate of the upper structure. 前記滑り支承体の摺動面に、表面にフッ素系樹脂を焼き付け処理した金属板から成る滑り部材を設けた請求項１，２，３または４に記載の免震装置。The seismic isolation device according to claim 1, 2, 3, or 4, wherein a sliding member made of a metal plate having a surface baked with a fluorine-based resin is provided on a sliding surface of the sliding support.
JP24685398A 1998-09-01 1998-09-01 Seismic isolation device Expired - Fee Related JP3825923B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310232A (en) * 2001-04-11 2002-10-23 Tokkyokiki Corp Vibration isolation pedestal for clean room
JP3763568B2 (en) * 2002-04-17 2006-04-05 株式会社ダイナミックデザイン Seismic isolation system
JP4497795B2 (en) * 2002-06-28 2010-07-07 株式会社ブリヂストン Seismic pads, insulator mounting structure, and transformer equipment
JP4824476B2 (en) * 2006-05-31 2011-11-30 住友林業株式会社 Seismic isolation devices and seismic isolation structures for buildings
KR101384027B1 (en) * 2013-08-13 2014-04-09 (주)한국방재기술 Vibration isolation module for earthquake reduction

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