JPH08326814A - Layered rubber support body - Google Patents
Layered rubber support bodyInfo
- Publication number
- JPH08326814A JPH08326814A JP13349095A JP13349095A JPH08326814A JP H08326814 A JPH08326814 A JP H08326814A JP 13349095 A JP13349095 A JP 13349095A JP 13349095 A JP13349095 A JP 13349095A JP H08326814 A JPH08326814 A JP H08326814A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- outer metal
- metal fitting
- laminated
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 claims abstract description 52
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 230000006378 damage Effects 0.000 abstract description 8
- 238000010008 shearing Methods 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010030 laminating Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Landscapes
- Vibration Prevention Devices (AREA)
- Springs (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は積層ゴム支承体に係り、
特に免震アイソレーターとして建築、土木構造物、機器
等の免震や防振に利用される積層ゴム支承体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated rubber bearing,
In particular, it relates to a laminated rubber bearing used as a seismic isolation isolator for seismic isolation and vibration isolation of buildings, civil engineering structures, equipment, etc.
【０００２】[0002]
【従来の技術】建築物等の構造物を地震の震動から保護
する免震アイソレーターとして、図５に示すように、複
数のゴム板１と鋼板のような金属板（中金具）２とを交
互に積層して加硫接着するとともに、上下両側から２枚
の金属板（外金具）３で挟持した積層ゴム支承体があ
り、外金具３の上下両側にそれぞれフランジ４を重ね、
ボルト（図示を省略。）により連結固定して使用され
る。なお、この積層ゴムを実際に構造物の下に設置する
場合には、ゴム板１の側周部に保護用ゴム層（図示を省
略。）が被覆あるいは装着される。また、外金具３とフ
ランジ４とは一体に構成しても良い。2. Description of the Related Art As a seismic isolation isolator for protecting structures such as buildings from earthquakes, as shown in FIG. 5, a plurality of rubber plates 1 and metal plates (metal fittings) 2 such as steel plates are alternately arranged. There is a laminated rubber bearing that is laminated and vulcanized and sandwiched between two metal plates (outer metal fittings) 3 from the upper and lower sides, and flanges 4 are stacked on the upper and lower sides of the outer metal fitting 3, respectively.
Used by connecting and fixing with bolts (not shown). When the laminated rubber is actually installed under the structure, a protective rubber layer (not shown) is covered or attached to the side peripheral portion of the rubber plate 1. Further, the outer metal fitting 3 and the flange 4 may be integrally formed.
【０００３】このような積層ゴム支承体としては、従来
から、図６（ａ）に示すように、中金具２の直径または
一辺の長さＤ3 がゴム板１の直径または一辺の長さＤ1
より大きく（Ｄ3 ＞Ｄ1 ）形成されたものと、図６
（ｂ）に示すように、両者の寸法が等しい（Ｄ3 ＝
Ｄ1 ）ものとがあるが、いずれのタイプの積層ゴム支承
体においても、外金具３の直径または一辺の長さＤ4 と
中金具２の直径または一辺の長さＤ3 との間にはあまり
差がなく、外金具３の直径等が若干大きく形成されてい
る。As such a laminated rubber bearing, conventionally, as shown in FIG. 6 (a), the diameter or the side length D 3 of the middle metal fitting 2 is the diameter or the side length D of the rubber plate 1. 1
A larger size (D 3 > D 1 ) is formed, as shown in FIG.
As shown in (b), the two dimensions are the same (D 3 =
D 1 ), but in any type of laminated rubber bearing, between the outer metal fitting 3 diameter or one side length D 4 and the middle metal fitting 2 diameter or one side length D 3. There is not much difference, and the outer metal fitting 3 is formed to have a slightly larger diameter.
【０００４】そして、このような積層ゴム支承体は、50
〜 150Kgf/cm2 の面圧σ（圧縮応力）が負荷された状態
では、図７に示すように、ゴム板１の側端部が外側へは
らみ出して（膨出して）構造物を支承し、さらに地震等
により水平方向の振動が入力されると、水平方向に変位
しながら振動を吸収し、優れた免震性を発揮することが
知られている。Such a laminated rubber bearing has 50
When the surface pressure σ (compressive stress) of ~ 150 Kgf / cm 2 is applied, the side end of the rubber plate 1 protrudes outward (bulges) to support the structure as shown in FIG. Further, it is known that when horizontal vibration is input due to an earthquake or the like, the vibration is absorbed while being displaced in the horizontal direction, and excellent seismic isolation is exhibited.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の積層ゴム支承体は、想定を越えた水平方向の
力が入力した場合に、図８に示すように、水平方向に大
きく変位し、はらみ出した最下層のゴム板１が外金具３
より外側へはみ出す。その結果、ゴム板１の外金具３と
の接合端部（図中、Ａで示す。）が外金具３の側周端部
と接触し、損傷を受けるという問題があった。However, such a conventional laminated rubber bearing is largely displaced in the horizontal direction as shown in FIG. 8 when an unexpected horizontal force is input. The outermost rubber plate 1 that sticks out is the outer metal fitting 3
It protrudes to the outside. As a result, there is a problem in that the joint end portion (shown by A in the figure) of the rubber plate 1 with the outer metal fitting 3 comes into contact with the side peripheral end portion of the outer metal fitting 3 and is damaged.
【０００６】このようなゴム板１側端部のはみ出し現象
は、面圧σが 100Kgf/cm2 以上で、剪断ひずみγが300%
以上（ゴム板１の総厚の 3倍以上の水平方向の変形を意
味する。）のとき明らかに見られ、特に剪断ひずみγが
400%以上で、ゴム板１のはみ出しによる損傷が顕著にな
ることが実験により確認されている。また、このような
損傷がゴム切れや製品破壊の原因の一つになることが考
えられる。[0006] Such a protrusion phenomenon at the end of the rubber plate 1 side is that the surface pressure σ is 100 Kgf / cm 2 or more and the shear strain γ is 300%.
The above is clearly seen (meaning horizontal deformation of 3 times or more of the total thickness of the rubber plate 1), and in particular, the shear strain γ is
It has been confirmed by experiments that the damage due to the protrusion of the rubber plate 1 becomes remarkable at 400% or more. Moreover, such damage may be one of the causes of rubber breakage and product destruction.
【０００７】本発明はこのような問題を解決するために
なされたもので、高面圧、高剪断ひずみ（水平方向大変
形）時において、ゴム板の側端部の外側金属板からのは
み出しが抑えられ、はみ出しに起因する損傷が防止され
た積層ゴム支承体を提供することを目的とする。The present invention has been made in order to solve such a problem. When the surface pressure and the shearing strain are high (horizontal large deformation), the side edge of the rubber plate does not protrude from the outer metal plate. An object of the present invention is to provide a laminated rubber bearing which is suppressed and is prevented from being damaged due to protrusion.
【０００８】[0008]
【課題を解決するための手段】本発明の積層ゴム支承体
は、複数の金属板とゴム板とを、接着または非接着状態
で交互に積層してなる積層ゴム支承体において、最外側
に積層された外側金属板の直径または一辺の長さを
Ｄ4 、中間部に積層された中間金属板の直径または一辺
の長さをＤ3 としたとき、以下の式に示すように、これ
らの差の 1/2に相当する前記外側金属板の突出寸法Ｌ
が、前記ゴム板の厚さｔR の 3倍以上であることを特徴
とする。 Ｌ（＝ 1/2（Ｄ4 −Ｄ3 ））≧ 3ｔR A laminated rubber bearing of the present invention is a laminated rubber bearing formed by alternately laminating a plurality of metal plates and rubber plates in a bonded or non-bonded state. Assuming that the diameter or the length of one side of the formed outer metal plate is D 4 , and the diameter or the length of one side of the intermediate metal plate laminated in the middle part is D 3 , the difference between them is expressed by the following formula. L of protrusion of the outer metal plate corresponding to 1/2 of
Is at least 3 times the thickness t R of the rubber plate. L (= 1/2 (D 4 -D 3)) ≧ 3t R
【０００９】[0009]
【作用】本発明の積層ゴム支承体においては、外側金属
板の直径または一辺の長さＤ4と中間金属板の直径また
は一辺の長さＤ3 との差の 1/2に相当する、外側金属板
の突出寸法Ｌが、ゴム板の厚さｔR の 3倍以上となって
いるので、高面圧、高剪断ひずみ（水平方向大変形）時
において、はらみ出したゴム板側端部が外側金属板の周
端部からはみ出すことがない。したがって、はみ出しに
起因するゴム板の損傷が防止され、高い支承能力が発揮
される。また、このような作用乃至効果は、高い面圧が
加わった状態ほど顕著に現れ、良好な免震、防振特性が
示される。In the laminated rubber bearing of the present invention, which corresponds to 1/2 of the difference between the length D 3 of the diameter or one side of the diameter or one side of the outer metal plate length D 4 and the intermediate metal plate, the outer Since the protruding dimension L of the metal plate is three times or more the thickness t R of the rubber plate, the protruding end of the rubber plate at the high surface pressure and high shear strain (horizontal deformation) Does not protrude from the peripheral edge of the outer metal plate. Therefore, the rubber plate is prevented from being damaged due to the protrusion, and high bearing ability is exhibited. Further, such an action or effect is more prominent in a state in which a higher surface pressure is applied, and good seismic isolation and vibration isolation characteristics are exhibited.
【００１０】[0010]
【実施例】以下、本発明の実施例について説明する。Embodiments of the present invention will be described below.
【００１１】実施例 図１、図２にそれぞれ示すように、直径Ｄ1 800mm、厚
さｔR 6mmの円形のゴム板５ 26 枚と、直径Ｄ3 820m
m、厚さ 4.5mmの円形の鋼板（中金具）６ 25 枚とを交
互に重ね、さらに上下両面のゴム板５上に、直径Ｄ4 8
70mm、厚さ22mmの連結鋼板（外金具）７ 2枚をそれぞれ
重ねて加硫成形し、積層ゴム支承体とした。なお、この
積層ゴム支承体の各ゴム板５の側周面５ａは、ゴム板の
厚さｔR （6mm）より小さい曲率半径Ｒの丸みで内側に
凹んでいるようにした。また、外金具７の直径Ｄ4 と中
金具６の直径Ｄ3 との差の 1/2に相当する、外金具７の
突出寸法Ｌは25mmであり、ゴム板５の厚さｔR のほぼ 4
倍（ 3倍以上）となっている。 この積層ゴム支承体
は、約 100〜 150Kgf/cm2 の面圧下で使用され、水平変
位が30〜60cm（剪断ひずみγでゴム板の総厚15.6mmの 2
00〜400%）の移動が想定されている。Example As shown in FIGS. 1 and 2, 5 26 circular rubber plates having a diameter D 1 800 mm and a thickness t R 6 mm, and a diameter D 3 820 m
The circular steel plates (medium metal fittings) 6 m with a thickness of 4.5 mm and a thickness of 4.5 mm are alternately stacked, and the diameter D 4 8 is placed on the rubber plates 5 on the upper and lower surfaces.
Seventy-two sheets of 70 mm and 22 mm thick connecting steel plates (outer metal fittings) were stacked and vulcanized to form a laminated rubber bearing. Incidentally, the side peripheral surface 5a of each rubber plate 5 of this laminated rubber bearing is made to be recessed inward by a roundness having a radius of curvature R smaller than the thickness t R (6 mm) of the rubber plate. Further, corresponding to half the difference between the diameter D 3 of the middle bracket 6 to the diameter D 4 of the outer bracket 7, projection dimension L of the outer bracket 7 is 25 mm, approximately the thickness t R of the rubber plate 5 Four
It is twice (more than three times). This laminated rubber bearing is used under a surface pressure of about 100 to 150 Kgf / cm 2 and has a horizontal displacement of 30 to 60 cm ( 2 % of the total thickness of the rubber plate 15.6 mm at shear strain γ).
A movement of 00-400%) is assumed.
【００１２】このような実施例の積層ゴム支承体に、σ
≧ 100Kgf/cm2 の高面圧を加えると、図３（ａ）に示す
ように、各ゴム板５が変形し（はらみ出し）、さらにこ
のような高面圧下でγ≧300%の高剪断ひずみを加える
と、図３（ｂ）に示すように、大きく変位するが、最下
層のゴム板５に外金具７の側周端部からのはみ出しが見
られず、良好な防振性能を示す。In the laminated rubber bearing of such an embodiment, σ
When a high surface pressure of ≧ 100 Kgf / cm 2 is applied, each rubber plate 5 is deformed (extended out) as shown in FIG. 3 (a), and further high shear of γ ≧ 300% under such high surface pressure. As shown in FIG. 3B, when a strain is applied, the rubber plate 5 is largely displaced, but the lowermost rubber plate 5 does not show any protrusion from the side peripheral edge of the outer metal fitting 7 and exhibits good vibration damping performance. .
【００１３】なお、実施例の積層ゴム支承体では、外金
具７の突出寸法Ｌがゴム板５の厚さｔR のほぼ 4倍とな
っているが、この寸法をｔR の 3倍以上とすることで十
分な効果を上げることができる すなわち、積層ゴム支承体における剪断破壊は、通常剪
断ひずみγが450%程度すなわちゴム板５総厚の 4.5倍程
度の水平変形時に起こるので、Ｌをゴム板５の厚さｔR
の 4.5倍とした場合は、どのような剪断変形に対して
も、ゴム板５が外金具７の側周端部からはみ出すことが
ない。しかし、通常は 250〜300%の剪断ひずみを想定し
て設計されるので、外金具７の突出寸法Ｌをゴム板５の
厚さｔR の3倍以上とすることで、ゴム板５のはみ出し
防止効果を十分に上げることができる。In the laminated rubber bearing of the embodiment, the protruding dimension L of the outer metal fitting 7 is almost four times the thickness t R of the rubber plate 5, but this dimension is set to be three times t R or more. That is, the shear effect in the laminated rubber bearing is usually caused when the shear strain γ is about 450%, that is, when the horizontal deformation is about 4.5 times the total thickness of the rubber plate 5, so L is the rubber. Thickness of plate 5 t R
When it is set to 4.5 times, the rubber plate 5 does not protrude from the side peripheral end portion of the outer metal member 7 against any shear deformation. However, since it is normally designed assuming a shear strain of 250 to 300%, the protrusion L of the outer metal fitting 7 is set to be three times or more the thickness t R of the rubber plate 5 to prevent the rubber plate 5 from protruding. The prevention effect can be sufficiently enhanced.
【００１４】さらに、地震等により想定を越えた水平方
向の力が入力し、ゴム板５が外金具７の側周端部からは
み出すおそれがある場合には、図４に示すように、外金
具７の上側の周端部７ａを丸みをつけて面取りすること
により、ゴム板５のはみ出しによる損傷をさらに効果的
に防止することができる。Further, when an unexpected horizontal force is input due to an earthquake or the like and the rubber plate 5 is likely to protrude from the side peripheral end of the outer metal fitting 7, as shown in FIG. By rounding and chamfering the upper peripheral end portion 7 a of the rubber plate 7, it is possible to more effectively prevent damage due to the rubber plate 5 protruding.
【００１５】なお、以上の実施例では、円形のゴム板と
円形の金属板（中金具および外金具）とを交互に積層し
接着して得られた丸形の積層ゴム支承体について説明し
たが、本発明はこのような形状に限定されず、正方形の
ような多角形のゴム板と同形の金属板とを積層した角形
の積層ゴム支承体においても、外金具の突出寸法Ｌをゴ
ム板の厚さｔR の 3倍以上とすることにで、同様の効果
を上げることができる。また、前記丸形あるいは角形の
積層ゴム支承体において、ゴム板と金属板とを非接着状
態で積層一体化しても、同様の効果を上げることができ
る。In the above embodiments, the round laminated rubber bearings obtained by alternately laminating and bonding circular rubber plates and circular metal plates (intermediate metal fittings and outer metal fittings) have been described. The present invention is not limited to such a shape, and even in a rectangular laminated rubber bearing in which a polygonal rubber plate such as a square and a metal plate of the same shape are laminated, the protrusion dimension L of the outer metal fitting is set to The same effect can be obtained by setting the thickness t R to 3 times or more. Further, in the round or square laminated rubber bearing, the same effect can be obtained even if the rubber plate and the metal plate are laminated and integrated in a non-adhesive state.
【００１６】[0016]
【発明の効果】以上説明したように本発明の積層ゴム支
承体によれば、高面圧、高剪断ひずみ時において、ゴム
板の外側金属板からのはみ出しが抑えられ、はみ出しに
起因する損傷が防止される。したがって、ゴム切れや製
品破壊が生じることがなく、長期間高い支承能力が発揮
され、免震アイソレーターとして好適している。As described above, according to the laminated rubber bearing of the present invention, the protrusion of the rubber plate from the outer metal plate is suppressed under high surface pressure and high shear strain, and the damage caused by the protrusion is prevented. To be prevented. Therefore, it is suitable as a seismic isolation isolator because it does not cause rubber breakage or product destruction and exhibits a high bearing capacity for a long period of time.
【図１】本発明の積層ゴム支承体の一実施例を示す断面
図。FIG. 1 is a sectional view showing an embodiment of a laminated rubber bearing of the present invention.
【図２】図１におけるＢ部を拡大して示す図。FIG. 2 is an enlarged view showing a portion B in FIG.
【図３】同実施例の積層ゴム支承体に高面圧を加えた場
合の、ゴム板側端部のはらみ出し形状を示す断面図。FIG. 3 is a cross-sectional view showing a protruding shape of an end portion on a rubber plate side when a high surface pressure is applied to the laminated rubber bearing body of the embodiment.
【図４】本発明の積層ゴム支承体の別の実施例の要部を
示す断面図。FIG. 4 is a cross-sectional view showing the main parts of another embodiment of the laminated rubber bearing of the present invention.
【図５】従来の積層ゴム支承体の構造を示す断面図。FIG. 5 is a sectional view showing a structure of a conventional laminated rubber bearing.
【図６】従来の積層ゴム支承体の要部を拡大して示す断
面図。FIG. 6 is an enlarged cross-sectional view showing a main part of a conventional laminated rubber bearing.
【図７】従来の積層ゴム支承体に面圧を加えた場合の、
ゴム板側端部のはらみ出し形状を示す断面図。FIG. 7 shows a case where surface pressure is applied to a conventional laminated rubber bearing,
Sectional drawing which shows the protruding shape of the rubber plate side edge part.
【図８】従来の積層ゴム支承体に高面圧、高剪断ひずみ
を加えた場合、ゴム板が外金具からはみ出した状態を示
す断面図。FIG. 8 is a cross-sectional view showing a state in which a rubber plate protrudes from an outer metal member when a high surface pressure and a high shear strain are applied to a conventional laminated rubber bearing.
５………ゴム板 ５ａ………側周面 ６………中金具 ７………外金具 5 ………… Rubber plate 5a ………… Side peripheral surface 6 ………… Middle metal fitting 7 ………… Outer metal fitting
Claims (2)
非接着状態で交互に積層してなる積層ゴム支承体におい
て、 最外側に積層された外側金属板の直径または一辺の長さ
をＤ4 、中間部に積層された中間金属板の直径または一
辺の長さをＤ3 としたとき、以下の式に示すように、こ
れらの差の 1/2に相当する前記外側金属板の突出寸法Ｌ
が、前記ゴム板の厚さｔR の 3倍以上であることを特徴
とする積層ゴム支承体。 Ｌ（＝ 1/2（Ｄ4 −Ｄ3 ））≧ 3ｔR 1. In a laminated rubber bearing body in which a plurality of metal plates and rubber plates are alternately laminated in a bonded or non-bonded state, the outer metal plate laminated on the outermost side has a diameter or a length of one side. Assuming that D 4 is the diameter or the length of one side of the intermediate metal plate laminated in the middle, D 3 is the protrusion of the outer metal plate corresponding to 1/2 of the difference, as shown in the following formula. Dimension L
Is at least 3 times the thickness t R of the rubber plate. L (= 1/2 (D 4 -D 3)) ≧ 3t R
つけて面取りされていることを特徴とする請求項１記載
の積層ゴム支承体。2. The laminated rubber bearing according to claim 1, wherein an inner peripheral end portion of the outer metal plate is rounded and chamfered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13349095A JPH08326814A (en) | 1995-05-31 | 1995-05-31 | Layered rubber support body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13349095A JPH08326814A (en) | 1995-05-31 | 1995-05-31 | Layered rubber support body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08326814A true JPH08326814A (en) | 1996-12-10 |
Family
ID=15105994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13349095A Pending JPH08326814A (en) | 1995-05-31 | 1995-05-31 | Layered rubber support body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08326814A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001090777A (en) * | 1999-09-24 | 2001-04-03 | Bando Chem Ind Ltd | Base isolation device |
| JP2013108558A (en) * | 2011-11-21 | 2013-06-06 | Toyo Tire & Rubber Co Ltd | Air spring |
| JP2017141942A (en) * | 2016-02-12 | 2017-08-17 | 昭和電線ケーブルシステム株式会社 | Laminate rubber bearing body |
-
1995
- 1995-05-31 JP JP13349095A patent/JPH08326814A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001090777A (en) * | 1999-09-24 | 2001-04-03 | Bando Chem Ind Ltd | Base isolation device |
| JP2013108558A (en) * | 2011-11-21 | 2013-06-06 | Toyo Tire & Rubber Co Ltd | Air spring |
| JP2017141942A (en) * | 2016-02-12 | 2017-08-17 | 昭和電線ケーブルシステム株式会社 | Laminate rubber bearing body |
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