JP7042642B2

JP7042642B2 - Seismic isolation mechanism

Info

Publication number: JP7042642B2
Application number: JP2018022201A
Authority: JP
Inventors: 銘崇劉; 和彦磯田; 智貴濱
Original assignee: Shimizu Corp
Current assignee: Shimizu Corp
Priority date: 2018-02-09
Filing date: 2018-02-09
Publication date: 2022-03-28
Anticipated expiration: 2038-02-09
Also published as: JP2019138376A

Description

本発明は、免震機構に関する。 The present invention relates to a seismic isolation mechanism.

従来、すべり支承のすべり面を傾斜面とした傾斜すべり支承が知られている（例えば、特許文献１参照）。傾斜すべり支承は、互いに直交する方向にそれぞれＶ字形状に傾斜する２つの傾斜面で摺動子を上下から挟み、摺動子が下側の傾斜面に沿って摺動するとともに、上側の傾斜面に沿って摺動するように構成されている。摺動子の上下には、傾斜面に沿って滑る摩擦面がそれぞれ形成されている。傾斜すべり支承は、摺動子が傾斜面を摺動することにより、摺動子と傾斜面との摩擦抵抗力による減衰力と、自重による復元力と、を得るように構成されている。 Conventionally, an inclined sliding bearing in which the sliding surface of the sliding bearing is an inclined surface is known (see, for example, Patent Document 1). In the inclined sliding bearing, the slider is sandwiched from above and below by two inclined surfaces that are inclined in a V shape in the directions orthogonal to each other, and the slider slides along the lower inclined surface and is inclined on the upper side. It is configured to slide along a surface. Friction surfaces that slide along the inclined surface are formed above and below the slider. The inclined sliding bearing is configured so that the slider slides on the inclined surface to obtain a damping force due to frictional resistance between the slider and the inclined surface and a restoring force due to its own weight.

このように、傾斜すべり支承は、免震装置に必要な荷重支持機能、減衰機能、および復元機能を有している。また、傾斜すべり支承は、周期特性を有していないことから地震の特性の影響を受けにくく共振しないこと、建物が不整形であったり偏荷重であったり荷重の変動があったりする場合でも捩れが生じにくいこと、残留変位がわずかで累計しないため、地震後に建物を継続して使用可能であるという特徴がある。
なお、特許文献１には、摺動子と傾斜面との摩擦係数μと、傾斜面の傾斜角度θとの関係を、ｔａｎθ＝（０．２～０．４）μ程度とすることで残留変位を抑制できることが開示されている。 As described above, the inclined sliding bearing has the load supporting function, the damping function, and the restoring function necessary for the seismic isolation device. In addition, since the inclined sliding bearing does not have periodic characteristics, it is not easily affected by the characteristics of earthquakes and does not resonate, and even if the building is irregular, uneven load, or load fluctuation, it twists. It is difficult for the building to occur, and the residual displacement is small and does not accumulate, so the building can be used continuously after the earthquake.
In Patent Document 1, the relationship between the friction coefficient μ between the slider and the inclined surface and the inclination angle θ of the inclined surface is set to about tan θ = (0.2 to 0.4) μ. It is disclosed that the displacement can be suppressed.

特開２０１３－１３０２１６号公報Japanese Unexamined Patent Publication No. 2013-130216

摺動子には、傾斜面の傾斜角度が切り替わる箇所を通過する際に、衝撃による加速度が生じることになる。発生した地震が中小地震の場合、摺動子が傾斜角度が切り替わる箇所を頻繁に通過して加速度が生じるため、免震性能上の問題はないが、居住性が悪いという問題がある。
また、摺動子が傾斜面を摺動する際に、摺動面に引っ掛かったり滑ったりを繰り返すスティックスリップ現象が発生し、高周波成分を有する加速度が発生するという問題もある。
また、すべり免震支承が設けられた構造物の上層階および下層階には、すべり免震支承の上側の上部構造に起因して生じる高周波（高次モード）成分により、中間階に比べて大きな加速度が生じるという問題もある。 Acceleration due to impact is generated in the slider when passing through a portion where the inclination angle of the inclined surface is switched. When the generated earthquake is a small and medium-sized earthquake, the slider frequently passes through the place where the inclination angle changes and acceleration is generated, so that there is no problem in seismic isolation performance, but there is a problem that the habitability is poor.
Further, when the slider slides on the inclined surface, a stick-slip phenomenon that repeatedly gets caught in and slides on the sliding surface occurs, and there is also a problem that acceleration having a high frequency component is generated.
In addition, the upper and lower floors of the structure provided with the slip seismic isolation bearings are larger than the middle floors due to the high frequency (higher-order mode) components generated by the upper structure above the slip seismic isolation bearings. There is also the problem of acceleration.

本発明は、上述する問題点に鑑みてなされたもので、摺動子が傾斜面の傾斜角度が切り替わる箇所を通過する際に生じる加速度、スティックスリップ現象の衝撃によって生じる加速度、および、構造物の上階層や下階層に生じる中層階よりも大きな加速度を低減させることができる免震機構を提供することを目的とする。 The present invention has been made in view of the above-mentioned problems, and the acceleration generated when the slider passes through the place where the inclination angle of the inclined surface is switched, the acceleration generated by the impact of the stick-slip phenomenon, and the structure. It is an object of the present invention to provide a seismic isolation mechanism capable of reducing a larger acceleration than that of the middle layer generated in the upper layer and the lower layer.

上記目的を達成するため、本発明に係る免震機構は、水平方向に相対変位可能な下部構造体と上部構造体との間に設けられる免震機構において、前記下部構造体の上部に設けられ、一の水平方向に沿って下側に凸となるＶ字形状に形成された下部摺動面を有する下部案内部と、前記上部構造体の底部に設けられ、前記一の水平方向に直交する他の水平方向に沿って上側に凸となる逆Ｖ字形状に形成された上部摺動面を有する上部案内部と、前記下部摺動面と前記上部摺動面との間に配置され、前記下部摺動面に沿って前記下部案内部と前記一の水平方向に相対変位可能であるともに、前記上部摺動面に沿って前記上部案内部と前記他の水平方向に相対変位可能な摺動子と、を有し、前記摺動子は、前記下部摺動面を摺動可能な下部摺動部と、前記下部摺動部の上側に配置されて前記上部摺動面を摺動可能な上部摺動部と、前記下部摺動部と前記上部摺動部との間に配置され前記下部摺動部と前記上部摺動部とを水平方向に相対移動可能に支持する積層ゴムと、を有し、前記下部構造体と前記上部構造体とが水平方向に相対変位すると、該相対変位に追従して前記積層ゴムが水平方向に変形し、前記積層ゴムの原位置に対する水平変位が所定の水平変位設定値を超えた後に、前記摺動子が前記下部摺動面および前記上部摺動面の少なくとも一方で摺動するように構成され、前記下部摺動部と前記上部摺動部との水平方向の相対変位量の最大値は、前記積層ゴムの厚さ寸法の２倍以下に設定され、前記積層ゴムは、水平方向の変形量が前記積層ゴムの厚さ寸法の２倍以下の場合には弾性変形し塑性変形せず、前記積層ゴムは、上下方向から見て縁部が前記下部摺動部および前記上部摺動部よりも外側に突出し、前記縁部が前記下部摺動部に固定された下側支持具および前記上部摺動部に固定された上側支持具で上下方向から挟持され、前記下側支持具は、前記下部摺動部の側面のみに当接して固定される下側固定板部と、前記下側固定板部の上端部から側方に突出し、前記積層ゴムの前記縁部の下面に前記下部摺動部の上面の高さで当接して前記積層ゴムを支持する下側支持板部と、を有し、断面形状がＬ字形であり、前記上側支持具は、前記上部摺動部の側面のみに当接して固定される上側固定板部と、前記上側固定板部の下端部から側方に突出し、前記積層ゴムの前記縁部の上面に前記上部摺動部の下面の高さで当接して前記積層ゴムを支持する上側支持板部と、を有し、断面形状がＬ字形であることを特徴とする。 In order to achieve the above object, the seismic isolation mechanism according to the present invention is provided above the substructure in a seismic isolation mechanism provided between the substructure and the superstructure that can be relatively displaced in the horizontal direction. , A lower guide portion having a V-shaped lower sliding surface formed in a V shape that is convex downward along one horizontal direction, and a lower guide portion provided at the bottom of the upper structure and orthogonal to the one horizontal direction. An upper guide portion having an inverted V-shaped upper sliding surface formed in an inverted V shape that is convex upward along another horizontal direction is arranged between the lower sliding surface and the upper sliding surface. Sliding that can be displaced relative to the lower guide portion in the horizontal direction along the lower sliding surface, and can be displaced relative to the upper guide portion and the other horizontally along the upper sliding surface. The slider has a lower sliding portion that can slide on the lower sliding surface, and the slider is arranged above the lower sliding portion and can slide on the upper sliding surface. An upper sliding portion and a laminated rubber arranged between the lower sliding portion and the upper sliding portion and supporting the lower sliding portion and the upper sliding portion so as to be relatively movable in the horizontal direction. When the lower structure and the upper structure are relatively displaced in the horizontal direction, the laminated rubber is deformed in the horizontal direction following the relative displacement, and the horizontal displacement of the laminated rubber with respect to the in-situ position is predetermined. After the horizontal displacement set value is exceeded, the slider is configured to slide on at least one of the lower sliding surface and the upper sliding surface, and the lower sliding portion and the upper sliding portion are aligned with each other. The maximum value of the relative displacement amount in the horizontal direction is set to twice or less the thickness dimension of the laminated rubber, and the laminated rubber has a deformation amount in the horizontal direction of twice or less the thickness dimension of the laminated rubber. The laminated rubber is elastically deformed and not plastically deformed, and the edge portion of the laminated rubber projects outward from the lower sliding portion and the upper sliding portion, and the edge portion becomes the lower sliding portion. The lower support is sandwiched from above and below by the fixed lower support and the upper support fixed to the upper sliding portion, and the lower support is fixed by contacting only the side surface of the lower sliding portion. The side fixing plate portion and the upper end portion of the lower fixing plate portion project laterally and abut against the lower surface of the edge portion of the laminated rubber at the height of the upper surface of the lower sliding portion to support the laminated rubber. The upper support has an L-shaped cross section, and the upper support has an upper fixing plate portion that is fixed by contacting only the side surface of the upper sliding portion and the upper fixing portion. It protrudes laterally from the lower end of the plate and abuts on the upper surface of the edge of the laminated rubber at the height of the lower surface of the upper sliding portion. It is characterized by having an upper support plate portion for supporting the laminated rubber and having an L-shaped cross section .

本発明では、地震が生じ、下部構造体と上部構造体とが水平方向に相対変位すると、まず、摺動子は上部摺動面および下部摺動面に対して摺動せずに、積層ゴムのみが変形する。ここから更に下部構造体と上部構造体とが水平方向に相対変位して、積層ゴムの原位置に対する水平変位が所定の水平変位設定値を超えると、摺動子が上部摺動面および下部摺動面に対して摺動し始める。
これにより、摺動子が傾斜面（下部摺動面、上部摺動面）の傾斜角度が切り替わる箇所を通過する際に衝撃が生じたり、スティックスリップ現象の衝撃が生じたりした場合でも、積層ゴムが変形することにより衝撃を吸収できるため、摺動子に生じる加速度を低減させることができる。
また、傾斜滑り支承のみの免震機構と比べて、積層ゴムの変形によって免震機構の上部の構造に起因する高周波成分を低減させることができるため、構造物の上階層や下階層に生じる加速度を低減させることができる。
そして、下部摺動部と上部摺動部との水平方向の相対変位量の最大値は、積層ゴムの厚さ寸法の２倍以下に設定され、積層ゴムは、水平方向の変形量が積層ゴムの厚さ寸法の２倍以下の場合には弾性変形し塑性変形しないことにより、積層ゴムに確実に減衰性能が付与されるため、加速度の低減効果を高めることができる。
また、本発明に係る免震機構では、前記積層ゴムは、上下方向から見て縁部が前記下部摺動部および前記上部摺動部よりも外側に突出し、前記縁部が前記下部摺動部および前記上部摺動部に固定された支持具で上下方向から挟持されている。
このような構成とすることにより、積層ゴムを下部摺動部および上部摺動部に確実に固定することができる。また、積層ゴムの上下方向から見た形状を下部摺動部および上部摺動部よりも大きくすることができるため、下部摺動部および上部摺動部の形状にかかわらず積層ゴムの形状を設定することができる。 In the present invention, when an earthquake occurs and the lower structure and the upper structure are displaced relative to each other in the horizontal direction, first, the slider does not slide with respect to the upper sliding surface and the lower sliding surface, and the laminated rubber Only transforms. From here, when the lower structure and the upper structure are further displaced in the horizontal direction and the horizontal displacement with respect to the in-situ of the laminated rubber exceeds a predetermined horizontal displacement set value, the slider moves to the upper sliding surface and the lower sliding surface. It begins to slide with respect to the moving surface.
As a result, even if an impact is generated when the slider passes through a portion where the inclination angle of the inclined surface (lower sliding surface, upper sliding surface) is switched, or an impact of the stick-slip phenomenon occurs, the laminated rubber Since the impact can be absorbed by the deformation of the rubber, the acceleration generated in the slider can be reduced.
In addition, compared to the seismic isolation mechanism with only tilted sliding bearings, the deformation of the laminated rubber can reduce the high-frequency components caused by the structure above the seismic isolation mechanism, so that the acceleration generated in the upper and lower layers of the structure can be reduced. Can be reduced.
The maximum value of the horizontal relative displacement between the lower sliding portion and the upper sliding portion is set to be twice or less the thickness dimension of the laminated rubber, and the laminated rubber has a horizontal deformation amount of the laminated rubber. If it is less than twice the thickness of the rubber, it is elastically deformed and not plastically deformed, so that the laminated rubber is surely imparted with damping performance, so that the effect of reducing acceleration can be enhanced.
Further, in the seismic isolation mechanism according to the present invention, the laminated rubber has an edge portion protruding outward from the lower sliding portion and the upper sliding portion when viewed from the vertical direction, and the edge portion is the lower sliding portion. And it is sandwiched from above and below by a support fixed to the upper sliding portion.
With such a configuration, the laminated rubber can be reliably fixed to the lower sliding portion and the upper sliding portion. Further, since the shape of the laminated rubber seen from the vertical direction can be made larger than that of the lower sliding portion and the upper sliding portion, the shape of the laminated rubber can be set regardless of the shape of the lower sliding portion and the upper sliding portion. can do.

また、本発明に係る免震機構では、前記積層ゴムのせん断剛性Ｋｒｂは、前記積層ゴムのせん断剛性Ｋ_ｒｂ＝前記上部構造体の（自重Ｗ×摩擦係数μ+ｔａｎ傾斜角度θ）／前記摺動子の前記積層ゴムに設定する最大変位量Δ_ｍａｘで設定されていてもよい。
このような構成とすることにより、摺動子が傾斜面の傾斜角度が切り替わる箇所を通過する際に生じる加速度、スティックスリップ現象の衝撃によって生じる加速度、および、構造物の上階層や下階層に生じる中層階よりも大きな加速度をより低減させることができる。傾斜角度θとは、下部摺動面および上部摺動面の傾斜角度を示している。 Further, in the seismic isolation mechanism according to the present invention, the shear rigidity Krb of the laminated rubber is the shear rigidity _Krb of the laminated rubber = ( self-weight W × friction coefficient μ + tan inclination angle θ) of the superstructure / the above. The maximum displacement amount _Δmax set for the laminated rubber of the slider may be set.
With such a configuration, the acceleration generated when the slider passes through the place where the inclination angle of the inclined surface changes, the acceleration generated by the impact of the stick-slip phenomenon, and the acceleration generated in the upper and lower layers of the structure. It is possible to reduce the acceleration larger than that of the middle floor. The tilt angle θ indicates the tilt angle of the lower sliding surface and the upper sliding surface.

本発明によれば、摺動子が傾斜面の傾斜角度が切り替わる箇所を通過する際に生じる加速度、スティックスリップ現象の衝撃によって生じる加速度、および、構造物の上階層や下階層に生じる中層階よりも大きな加速度を低減させることができる。 According to the present invention, the acceleration generated when the slider passes through the place where the inclination angle of the inclined surface changes, the acceleration generated by the impact of the stick-slip phenomenon, and the middle layer generated in the upper and lower layers of the structure. Can also reduce large accelerations.

本発明の実施形態による免震機構の一例を示す分解斜視図である。It is an exploded perspective view which shows an example of the seismic isolation mechanism by embodiment of this invention. 本発明の実施形態による免震機構を上方から見た図である。It is the figure which looked at the seismic isolation mechanism by embodiment of this invention from above. 図２のＡ－Ａ線断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 図２のＢ－Ｂ線断面図である。FIG. 2 is a cross-sectional view taken along the line BB of FIG. （ａ）は下部構造体と上部構造体とがＸ方向に相対変位し始めた状態を説明する図、（ｂ）は（ａ）よりも多く下部構造体と上部構造体とがＸ方向に相対変位した状態を説明する図である。(A) is a diagram explaining a state in which the lower structure and the upper structure start to be relatively displaced in the X direction, and (b) is more than (a) and the lower structure and the upper structure are relative to each other in the X direction. It is a figure explaining the displaced state. 本実施形態による免震機構の復元特性を説明する図である。It is a figure explaining the restoration characteristic of the seismic isolation mechanism by this embodiment. 構造部の頂部における応答加速度波形のフーリエ振幅スペクトル（ＥＬＣｅｎｔｒｏ)を示すグラフである。It is a graph which shows the Fourier amplitude spectrum (EL Centro) of the response acceleration waveform at the top of the structure part. 解析対象の構造物の形状と解析モデルを示す図である。It is a figure which shows the shape of the structure to be analyzed and the analysis model. （ａ）はケース１の加振波形における各階の最大応答変位の比較を示す図、（ｂ）はケース１の加振波形における各階の最大応答加速度の比較を示す図、（ｃ）はケース１の加振波形における摺動子の積層ゴムに生じる変位と残留変位との比較を示す図である。(A) is a diagram showing a comparison of the maximum response displacement of each floor in the vibration waveform of Case 1, (b) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 1, and (c) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 1. It is a figure which shows the comparison between the displacement which occurs in the laminated rubber of a slider, and the residual displacement in the vibration waveform of. （ａ）はケース２の加振波形における各階の最大応答変位の比較を示す図、（ｂ）はケース２の加振波形における各階の最大応答加速度の比較を示す図、（ｃ）はケース２の加振波形における摺動子の積層ゴムに生じる変位と残留変位との比較を示す図である。(A) is a diagram showing a comparison of the maximum response displacement of each floor in the vibration waveform of Case 2, (b) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 2, and (c) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 2. It is a figure which shows the comparison between the displacement which occurs in the laminated rubber of a slider, and the residual displacement in the vibration waveform of. （ａ）はケース３の加振波形における各階の最大応答変位の比較を示す図、（ｂ）はケース３の加振波形における各階の最大応答加速度の比較を示す図、（ｃ）はケース３の加振波形における摺動子の積層ゴムに生じる変位と残留変位との比較を示す図である。(A) is a diagram showing a comparison of the maximum response displacement of each floor in the vibration waveform of Case 3, (b) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 3, and (c) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 3. It is a figure which shows the comparison of the displacement which occurs in the laminated rubber of a slider, and the residual displacement in the vibration waveform of. （ａ）はケース４の加振波形における各階の最大応答変位の比較を示す図、（ｂ）はケース４の加振波形における各階の最大応答加速度の比較を示す図、（ｃ）はケース４の加振波形における摺動子の積層ゴムに生じる変位と残留変位との比較を示す図である。(A) is a diagram showing a comparison of the maximum response displacement of each floor in the vibration waveform of Case 4, (b) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 4, and (c) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 4. It is a figure which shows the comparison between the displacement which occurs in the laminated rubber of a slider, and the residual displacement in the vibration waveform of. （ａ）はケース５の加振波形における各階の最大応答変位の比較を示す図、（ｂ）はケース５の加振波形における各階の最大応答加速度の比較を示す図、（ｃ）はケース５の加振波形における摺動子の積層ゴムに生じる変位と残留変位との比較を示す図である。(A) is a diagram showing a comparison of the maximum response displacement of each floor in the vibration waveform of Case 5, (b) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 5, and (c) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 5. It is a figure which shows the comparison of the displacement which occurs in the laminated rubber of a slider, and the residual displacement in the vibration waveform of. （ａ）はケース６の加振波形における各階の最大応答変位の比較を示す図、（ｂ）はケース６の加振波形における各階の最大応答加速度の比較を示す図、（ｃ）はケース６の加振波形における摺動子の積層ゴムに生じる変位と残留変位との比較を示す図である。(A) is a diagram showing a comparison of the maximum response displacements of each floor in the vibration waveform of Case 6, (b) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 6, and (c) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 6. It is a figure which shows the comparison between the displacement which occurs in the laminated rubber of a slider, and the residual displacement in the vibration waveform of. （ａ）はケース７の加振波形における各階の最大応答変位の比較を示す図、（ｂ）はケース７の加振波形における各階の最大応答加速度の比較を示す図、（ｃ）はケース７の加振波形における摺動子の積層ゴムに生じる変位と残留変位との比較を示す図である。(A) is a diagram showing a comparison of the maximum response displacement of each floor in the vibration waveform of Case 7, (b) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 7, and (c) is a diagram showing a comparison of the maximum response acceleration of each floor in the vibration waveform of Case 7. It is a figure which shows the comparison between the displacement which occurs in the laminated rubber of a slider, and the residual displacement in the vibration waveform of. （ａ）はケース１の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース１の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of Case 1 is 4 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of Case 1. It is a figure which shows the response acceleration of each floor when _max is 4 cm. （ａ）はケース２の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース２の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 2 is 4 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 2. It is a figure which shows the response acceleration of each floor when _max is 4 cm. （ａ）はケース３の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース３の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 3 is 4 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 3. It is a figure which shows the response acceleration of each floor when _max is 4 cm. （ａ）はケース４の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース４の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 4 is 4 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 4. It is a figure which shows the response acceleration of each floor when _max is 4 cm. （ａ）はケース５の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース５の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 5 is 4 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 5. It is a figure which shows the response acceleration of each floor when _max is 4 cm. （ａ）はケース６の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース６の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 6 is 4 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 6. It is a figure which shows the response acceleration of each floor when _max is 4 cm. （ａ）はケース７の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース７の加振波形における積層ゴムの最大変位量Δ_ｍａｘが４ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 7 is 4 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 7. It is a figure which shows the response acceleration of each floor when _max is 4 cm. （ａ）はケース１の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース１の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of Case 1 is 8 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of Case 1. It is a figure which shows the response acceleration of each floor when _max is 8 cm. （ａ）はケース２の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース２の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 2 is 8 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 2. It is a figure which shows the response acceleration of each floor when _max is 8 cm. （ａ）はケース３の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース３の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 3 is 8 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 3. It is a figure which shows the response acceleration of each floor when _max is 8 cm. （ａ）はケース４の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース４の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 4 is 8 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 4. It is a figure which shows the response acceleration of each floor when _max is 8 cm. （ａ）はケース５の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース５の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 5 is 8 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 5. It is a figure which shows the response acceleration of each floor when _max is 8 cm. （ａ）はケース６の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース６の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 6 is 8 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 6. It is a figure which shows the response acceleration of each floor when _max is 8 cm. （ａ）はケース７の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答変位を示す図、（ｂ）はケース７の加振波形における積層ゴムの最大変位量Δ_ｍａｘが８ｃｍの場合の各階の応答加速度を示す図である。(A) is a diagram showing the response displacement of each floor when the maximum displacement amount _Δmax of the laminated rubber in the vibration waveform of the case 7 is 8 cm, and (b) is the maximum displacement amount Δ of the laminated rubber in the vibration waveform of the case 7. It is a figure which shows the response acceleration of each floor when _max is 8 cm. （ａ）はケース１の加振波形における最大変位量と残留変位との比較を示すグラフ、（ｂ）はケース２の加振波形における最大変位量と残留変位との比較を示すグラフ、（ｃ）はケース３の加振波形における最大変位量と残留変位との比較を示すグラフ、（ｄ）はケース４の加振波形における最大変位量と残留変位との比較を示すグラフ、（ｅ）はケース５の加振波形における最大変位量と残留変位との比較を示すグラフ、（ｆ）はケース６の加振波形における最大変位量と残留変位との比較を示すグラフ、（ｇ）はケース７の加振波形における最大変位量と残留変位との比較を示すグラフである。(A) is a graph showing a comparison between the maximum displacement amount and the residual displacement in the vibration waveform of Case 1, and (b) is a graph showing the comparison between the maximum displacement amount and the residual displacement in the vibration waveform of Case 2. ) Is a graph showing a comparison between the maximum displacement amount and the residual displacement in the vibration waveform of Case 3, (d) is a graph showing a comparison between the maximum displacement amount and the residual displacement in the vibration waveform of Case 4, and (e) is a graph showing the comparison. The graph showing the comparison between the maximum displacement amount and the residual displacement in the vibration waveform of Case 5, (f) is the graph showing the comparison between the maximum displacement amount and the residual displacement in the vibration waveform of Case 6, and (g) is the case 7. It is a graph which shows the comparison between the maximum displacement amount and the residual displacement in the vibration waveform of.

以下、本発明の実施形態による免震機構１について、図１～図７に基づいて説明する。
図１および図２に示す本実施形態による免震機構１は、下部構造体１１（図３および図４参照）と上部構造体１２（図３および図４参照）との間の免震層１３（図３および図４参照）に設けられている。本実施形態では、免震機構１は、免震層１３に複数設けられているものとする。免震層１３に設けられた複数の免震機構１は、それぞれ同じ形態としている。
免震機構１は、下部構造体１１の上部に固定された下部案内部２と、上部構造体１２の底部に固定された上部案内部３と、下部案内部２と上部案内部３との間に配置された摺動子４と、を有している。 Hereinafter, the seismic isolation mechanism 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 7.
The seismic isolation mechanism 1 according to the present embodiment shown in FIGS. 1 and 2 is a seismic isolation layer 13 between the lower structure 11 (see FIGS. 3 and 4) and the upper structure 12 (see FIGS. 3 and 4). (See FIGS. 3 and 4). In the present embodiment, it is assumed that a plurality of seismic isolation mechanisms 1 are provided in the seismic isolation layer 13. The plurality of seismic isolation mechanisms 1 provided in the seismic isolation layer 13 have the same form.
The seismic isolation mechanism 1 is between the lower guide portion 2 fixed to the upper part of the lower structure 11, the upper guide portion 3 fixed to the bottom of the upper structure 12, and the lower guide portion 2 and the upper guide portion 3. It has a slider 4 arranged in the.

図３に示すように、下部案内部２は、摺動子４が摺動する下部摺動面２１を有する本体部２２と、本体部２２の下部に連結されて下部構造体１１に固定される固定部２３と、を有している。なお、図２では、固定部２３を省略している。
本体部２２は、長尺の略直方体となるブロック状に形成され、一の水平方向に延びる向きに配置されている。一の水平方向をＸ方向とし、一の水平方向に直交する他の水平方向をＹ方向とする。本体部２２の上面は、Ｘ方向に沿ってＸ方向の略中央部が下側に凸となる略Ｖ字形状の傾斜面に形成されている。この本体部２２の上面が下部摺動面２１となっている。下部摺動面２１の略中央部の屈曲している部分を下部屈曲部２１１とする。また、下部摺動面２１のうち、下部屈曲部２１１からＸ方向の一方側を第１下部摺動面２１２とし、下部屈曲部２１１からＸ方向の他方側を第２下部摺動面２１３とする。 As shown in FIG. 3, the lower guide portion 2 is connected to the main body portion 22 having the lower sliding surface 21 on which the slider 4 slides and the lower portion of the main body portion 22 and is fixed to the lower structure 11. It has a fixed portion 23 and. In FIG. 2, the fixing portion 23 is omitted.
The main body portion 22 is formed in a block shape which is a long substantially rectangular parallelepiped, and is arranged in a direction extending in one horizontal direction. One horizontal direction is the X direction, and the other horizontal direction orthogonal to one horizontal direction is the Y direction. The upper surface of the main body 22 is formed on a substantially V-shaped inclined surface in which a substantially central portion in the X direction is convex downward along the X direction. The upper surface of the main body 22 is the lower sliding surface 21. The bent portion of the substantially central portion of the lower sliding surface 21 is referred to as the lower bent portion 211. Further, of the lower sliding surface 21, one side in the X direction from the lower bent portion 211 is referred to as the first lower sliding surface 212, and the other side in the X direction from the lower bent portion 211 is referred to as the second lower sliding surface 213. ..

第１下部摺動面２１２および第２下部摺動面２１３は、それぞれ平面となる傾斜面に形成されている。第１下部摺動面２１２および第２下部摺動面２１３の水平面に対する傾斜角度は、互いに同じ値（傾斜角度θ）に設定されている。
第１下部摺動面２１２および第２下部摺動面２１３には、摺動子４との摩擦を低減させるようにステンレスやメッキ鋼板あるいはテフロン（登録商標）などの滑り材がそれぞれ設けられている。
図４に示すように、本体部２２の両側面（Ｙ方向の両側の端面）２２１，２２１は、それぞれＹ方向を向く略垂直面となるように形成されている。 The first lower sliding surface 212 and the second lower sliding surface 213 are each formed on a flat inclined surface. The tilt angles of the first lower sliding surface 212 and the second lower sliding surface 213 with respect to the horizontal plane are set to the same value (tilt angle θ).
The first lower sliding surface 212 and the second lower sliding surface 213 are each provided with a sliding material such as stainless steel, a plated steel plate, or Teflon (registered trademark) so as to reduce friction with the slider 4. ..
As shown in FIG. 4, both side surfaces (end surfaces on both sides in the Y direction) 221,221 of the main body portion 22 are formed so as to be substantially vertical surfaces facing the Y direction, respectively.

図３および図４に示すように、固定部２３は、板状に形成され、板面が水平面となる向きで本体部２２の下面と接合されている。固定部２３は、本体部２２よりもＸ方向およびＹ方向に大きい略長方形状に形成され、本体部２２よりもＸ方向およびＹ方向に突出している。固定部２３は、下部構造体１１の上面に固定されている。 As shown in FIGS. 3 and 4, the fixing portion 23 is formed in a plate shape and is joined to the lower surface of the main body portion 22 in a direction in which the plate surface is a horizontal plane. The fixed portion 23 is formed in a substantially rectangular shape that is larger in the X direction and the Y direction than the main body portion 22, and protrudes in the X direction and the Y direction from the main body portion 22. The fixing portion 23 is fixed to the upper surface of the lower structure 11.

図４に示すように、上部案内部３は、摺動子４が摺動する上部摺動面３１を有する本体部３２と、本体部３２の上部に連結されて上部構造体１２に固定される固定部３３と、を有している。なお、図２では、固定部３３を省略している。
本体部３２は、長尺の略直方体となるブロック状に形成され、Ｙ方向に延びる向きに配置されている。本体部３２の下面は、Ｙ方向に沿ってＹ方向の略中央部が上側に凸となる略逆Ｖ字形状の傾斜面に形成されている。この本体部３２の下面が上部摺動面３１となっている。上部摺動面３１の略中央部の屈曲している部分を上部屈曲部３１１とする。また、上部摺動面３１のうち、上部屈曲部３１１からＹ方向の一方側を第１上部摺動面３１２とし、上部屈曲部３１１からＹ方向の他方側を第２上部摺動面３１３とする。 As shown in FIG. 4, the upper guide portion 3 is connected to the main body portion 32 having the upper sliding surface 31 on which the slider 4 slides, and the upper portion of the main body portion 32, and is fixed to the upper structure 12. It has a fixed portion 33 and. In FIG. 2, the fixed portion 33 is omitted.
The main body portion 32 is formed in a block shape which is a long substantially rectangular parallelepiped, and is arranged in a direction extending in the Y direction. The lower surface of the main body 32 is formed on a substantially inverted V-shaped inclined surface in which a substantially central portion in the Y direction is convex upward along the Y direction. The lower surface of the main body 32 is the upper sliding surface 31. The bent portion of the substantially central portion of the upper sliding surface 31 is referred to as the upper bent portion 311. Further, of the upper sliding surface 31, one side in the Y direction from the upper bent portion 311 is designated as the first upper sliding surface 312, and the other side in the Y direction from the upper bent portion 311 is referred to as the second upper sliding surface 313. ..

第１上部摺動面３１２および第２上部摺動面３１３は、それぞれ平面となる傾斜面に形成されている。第１上部摺動面３１２および第２上部摺動面３１３の水平面に対する傾斜角度は、互いに同じ値（傾斜角度θ）に設定されている。この傾斜角度θは、第１下部摺動面２１２および第２下部摺動面２１３の水平面に対する傾斜角度θと同じ値となっている。
第１上部摺動面３１２および第２上部摺動面３１３には、摺動子４との摩擦を低減させるようにステンレスやメッキ鋼板あるいはテフロン（登録商標）などの滑り材がそれぞれ設けられている。
図３に示すように、本体部３２の両側面（Ｘ方向の両側の端面）３２１，３２１は、それぞれＸ方向を向く略垂直面となるように形成されている。 The first upper sliding surface 312 and the second upper sliding surface 313 are each formed on a flat inclined surface. The tilt angles of the first upper sliding surface 312 and the second upper sliding surface 313 with respect to the horizontal plane are set to the same value (tilt angle θ). The inclination angle θ is the same value as the inclination angle θ with respect to the horizontal plane of the first lower sliding surface 212 and the second lower sliding surface 213.
The first upper sliding surface 312 and the second upper sliding surface 313 are each provided with a sliding material such as stainless steel, a plated steel plate, or Teflon (registered trademark) so as to reduce friction with the slider 4. ..
As shown in FIG. 3, both side surfaces (end surfaces on both sides in the X direction) 321 and 321 of the main body portion 32 are formed so as to be substantially vertical surfaces facing the X direction, respectively.

図３および図４に示すように、固定部３３は、板状に形成され、板面が水平面となる向きで本体部３２の上面と接合されている。固定部３３は、本体部３２よりもＸ方向およびＹ方向に大きい略長方形状に形成され、本体部３２よりもＸ方向およびＹ方向に突出している。固定部３３は、上部構造体１２の下面に固定されている。 As shown in FIGS. 3 and 4, the fixing portion 33 is formed in a plate shape and is joined to the upper surface of the main body portion 32 in a direction in which the plate surface is a horizontal plane. The fixed portion 33 is formed in a substantially rectangular shape that is larger in the X direction and the Y direction than the main body portion 32, and protrudes in the X direction and the Y direction from the main body portion 32. The fixing portion 33 is fixed to the lower surface of the upper structure 12.

このような下部案内部２と上部案内部３とは、上下方向に間をあけて重なるように配置され、下部案内部２と上部案内部３とが上下方向に重なる交差部１０に摺動子４が配置されている。 Such a lower guide portion 2 and an upper guide portion 3 are arranged so as to overlap each other with a gap in the vertical direction, and a slider is provided at an intersection 10 where the lower guide portion 2 and the upper guide portion 3 overlap in the vertical direction. 4 is arranged.

図３および図４に示すように、摺動子４は、下部摺動面２１と当接する下部当接面４１を有する下部摺動部４２と、上部摺動面３１と当接する上部当接面４３を有する上部摺動部４４と、下部摺動部４２と上部摺動部４４との間に配置される積層ゴム４５と、を有している。さらに、本実施形態では、下部摺動部４２のＹ方向の両縁部それぞれから下側に突出し下部案内部２の本体部２２のＹ方向の両側にそれぞれ配置される一対の下部ガイド部４６，４６と、上部摺動部４４のＸ方向の両縁部それぞれから上側に突出し上部案内部３の本体部３２のＸ方向の両側にそれぞれ配置される一対の上部ガイド部４７，４７と、を有している。 As shown in FIGS. 3 and 4, the slider 4 has a lower sliding portion 42 having a lower contact surface 41 that abuts on the lower sliding surface 21 and an upper contact surface that abuts on the upper sliding surface 31. It has an upper sliding portion 44 having a 43, and a laminated rubber 45 arranged between the lower sliding portion 42 and the upper sliding portion 44. Further, in the present embodiment, a pair of lower guide portions 46, which protrude downward from each of both edges of the lower sliding portion 42 in the Y direction and are arranged on both sides of the main body portion 22 of the lower guide portion 2 in the Y direction. It has 46 and a pair of upper guide portions 47, 47 that protrude upward from both edges of the upper sliding portion 44 in the X direction and are arranged on both sides of the main body portion 32 of the upper guide portion 3 in the X direction, respectively. is doing.

下部摺動部４２は、平面視形状（上方から見た形状）が略正方形となるブロック状に形成されている。
一対の下部ガイド部４６，４６は、互いにＹ方向に間隔をあけて配置されている。一対の下部ガイド部４６，４６の間隔は、下部案内部２の本体部２２のＹ方向の寸法よりもやや大きく形成されている。一対の下部ガイド部４６，４６における互いにＹ方向に対向する内側面４６１，４６１は、鉛直面に形成されている。
下部摺動部４２の下面のうちの一対の下部ガイド部４６，４６の間の領域に下部当接面４１が形成されている。 The lower sliding portion 42 is formed in a block shape having a substantially square shape (shape seen from above) in a plan view.
The pair of lower guide portions 46, 46 are arranged so as to be spaced apart from each other in the Y direction. The distance between the pair of lower guide portions 46, 46 is formed to be slightly larger than the dimension of the main body portion 22 of the lower guide portion 2 in the Y direction. The inner side surfaces 461 and 461 of the pair of lower guide portions 46, 46 facing each other in the Y direction are formed on a vertical surface.
A lower contact surface 41 is formed in a region between a pair of lower guide portions 46, 46 on the lower surface of the lower sliding portion 42.

下部摺動部４２は、下部案内部２の上側に配置されると、下部当接面４１が下部案内部２の下部摺動面２１と当接し、一対の下部ガイド部４６，４６が下部案内部２の本体部２２のＹ方向の両側方に配置される。図４に示すように、一対の下部ガイド部４６，４６それぞれの内側面４６１，４６１は、本体部２２の側面（Ｙ方向の端面）２２１，２２１と対向している。本実施形態では、一対の下部ガイド部４６，４６それぞれの内側面４６１，４６１に滑り材４６２，４６２が設けられていて、滑り材４６２，４６２が本体部２２の側面２２１，２２１と当接している。 When the lower sliding portion 42 is arranged above the lower guide portion 2, the lower contact surface 41 comes into contact with the lower sliding surface 21 of the lower guide portion 2, and the pair of lower guide portions 46, 46 abuts the lower guide portion 46. It is arranged on both sides of the main body portion 22 of the portion 2 in the Y direction. As shown in FIG. 4, the inner side surfaces 461 and 461 of each of the pair of lower guide portions 46, 46 face the side surfaces (end faces in the Y direction) 221,221 of the main body portion 22. In the present embodiment, sliding members 462 and 462 are provided on the inner side surfaces 461 and 461 of each of the pair of lower guide portions 46 and 46, and the sliding members 462 and 462 come into contact with the side surfaces 221,221 of the main body portion 22. There is.

図３に示すように、下部当接面４１は、Ｘ方向に沿ってＸ方向の略中央部が下側に凸となる略Ｖ字形状の傾斜面に形成されている。この下部当接面４１のＸ方向の略中央部の屈曲している部分を下部屈曲部４１１とする。
また、下部当接面４１のうち、下部屈曲部４１１よりもＸ方向の一方側を第１下部当接面４１２とし、下部屈曲部４１１よりもＸ方向の他方側を第２下部当接面４１３とする。
第１下部当接面４１２および第２下部当接面４１３には、それぞれテフロン（登録商標）などの滑り材４１４がそれぞれ設けられている。
下部摺動部４２の上面は略水平面に形成され、積層ゴム４５が接続されている。 As shown in FIG. 3, the lower contact surface 41 is formed on a substantially V-shaped inclined surface in which a substantially central portion in the X direction is convex downward along the X direction. The bent portion of the substantially central portion of the lower contact surface 41 in the X direction is referred to as the lower bent portion 411.
Further, of the lower abutting surface 41, one side in the X direction from the lower bent portion 411 is the first lower abutting surface 412, and the other side in the X direction from the lower bent portion 411 is the second lower abutting surface 413. And.
A sliding material 414 such as Teflon (registered trademark) is provided on each of the first lower contact surface 412 and the second lower contact surface 413, respectively.
The upper surface of the lower sliding portion 42 is formed in a substantially horizontal plane, and the laminated rubber 45 is connected to the upper surface.

上部摺動部４４は、平面視形状（上方から見た形状）が略正方形となるブロック状に形成されている。
一対の上部ガイド部４７，４７は、互いにＸ方向に間隔をあけて配置されている。一対の上部ガイド部４７，４７の間隔は、上部案内部３の本体部２２のＸ方向の寸法よりもやや大きく形成されている。一対の上部ガイド部４７，４７における互いにＸ方向に対向する内側面４７１，４７１は、鉛直面に形成されている。
上部摺動部４４の下面のうちの一対の上部ガイド部４７，４７の間の領域に上部当接面４３が形成されている。 The upper sliding portion 44 is formed in a block shape having a substantially square shape (shape seen from above) in a plan view.
The pair of upper guide portions 47, 47 are arranged at intervals in the X direction from each other. The distance between the pair of upper guide portions 47, 47 is formed to be slightly larger than the dimension of the main body portion 22 of the upper guide portion 3 in the X direction. The inner side surfaces 471, 471 of the pair of upper guide portions 47, 47 facing each other in the X direction are formed in a vertical plane.
The upper contact surface 43 is formed in the region between the pair of upper guide portions 47, 47 on the lower surface of the upper sliding portion 44.

図４に示すように、上部摺動部４４は、上部案内部３の下側に配置されると、上部当接面４３が上部案内部３の下部摺動面２１と当接し、一対の上部ガイド部４７，４７が上部案内部３の本体部３２のＸ方向の両側方に配置される。図３に示すように、一対の上部ガイド部４７，４７それぞれの内側面４７１，４７１は、本体部３２の側面（Ｘ方向の両側の端面）３２１，３２１と対向している。本実施形態では、一対の上部ガイド部４７，４７それぞれの内側面４７１，４７１に滑り材４７２，４７２が設けられていて、滑り材４７２，４７２が本体部３２の側面３２１，３２１と当接している。 As shown in FIG. 4, when the upper sliding portion 44 is arranged below the upper guide portion 3, the upper contact surface 43 abuts on the lower sliding surface 21 of the upper guide portion 3, and a pair of upper portions. Guide portions 47, 47 are arranged on both sides of the main body portion 32 of the upper guide portion 3 in the X direction. As shown in FIG. 3, the inner side surfaces 471 and 471 of each of the pair of upper guide portions 47 and 47 face the side surfaces (end surfaces on both sides in the X direction) 321, 321 of the main body portion 32. In the present embodiment, sliding members 472 and 472 are provided on the inner side surfaces 471 and 471 of each of the pair of upper guide portions 47 and 47, and the sliding members 472 and 472 come into contact with the side surfaces 321, 321 of the main body portion 32. There is.

図４に示すように、上部当接面４３は、Ｙ方向に沿ってＸ方向の略中央部が上側に凸となる略逆Ｖ字形状の傾斜面に形成されている。この上部当接面４３のＹ方向の略中央部の屈曲している部分を上部屈曲部４３１とする。
また、上部当接面４３のうち、上部屈曲部４３１よりもＹ方向の一方側を第１上部当接面４３２とし、上部屈曲部４３１よりもＹ方向の他方側を第２上部当接面４３３とする。
第１上部当接面４３２および第２上部当接面４３３には、それぞれテフロン（登録商標）などの滑り材４３４がそれぞれ設けられている。
上部摺動部４４の下面は略水平面に形成され、積層ゴム４５が接続されている。
下部摺動部４２の上面と上部摺動部４４の下面とは、略同じ正方形に形成され、積層ゴムを介して上下方向に重なっている。下部摺動部４２の上面の縁部と上部摺動部４４の下面の縁部とは、上下方向に重なっている。 As shown in FIG. 4, the upper contact surface 43 is formed on a substantially inverted V-shaped inclined surface in which a substantially central portion in the X direction is convex upward along the Y direction. The bent portion of the substantially central portion of the upper contact surface 43 in the Y direction is referred to as the upper bent portion 431.
Further, of the upper abutting surface 43, one side in the Y direction from the upper bent portion 431 is designated as the first upper abutting surface 432, and the other side in the Y direction from the upper bent portion 431 is the second upper abutting surface 433. And.
The first upper contact surface 432 and the second upper contact surface 433 are each provided with a sliding material 434 such as Teflon (registered trademark).
The lower surface of the upper sliding portion 44 is formed in a substantially horizontal plane, and the laminated rubber 45 is connected to the lower surface.
The upper surface of the lower sliding portion 42 and the lower surface of the upper sliding portion 44 are formed in substantially the same square shape, and overlap each other in the vertical direction via the laminated rubber. The edge of the upper surface of the lower sliding portion 42 and the edge of the lower surface of the upper sliding portion 44 overlap each other in the vertical direction.

図３および図４に示すように、積層ゴム４５は、ゴムと薄鋼板とを鉛直に積層した公知の構造のもので、水平方向に弾性変形可能に構成され、下部摺動部４２と上部摺動部４４とを水平方向に相対移動可能に連結している。
積層ゴム４５は、上下方向から見た形状が下部摺動部４２の上面および上部摺動部４４の下面よりも大きい正方形に形成され、下部摺動部４２の上面と上部摺動部４４の下面との間に配置された状態で、縁部４５ａが下部摺動部４２の縁部４２ａおよび上部摺動部４４の縁部４４ａよりも外側に突出している。
積層ゴム４５は、下部摺動部４２の上面および上部摺動部４４の下面それぞれに固定されているとともに、下部摺動部４２および上部摺動部４４に固定された支持具４８に支持されている。 As shown in FIGS. 3 and 4, the laminated rubber 45 has a known structure in which rubber and a thin steel plate are vertically laminated, and is configured to be elastically deformable in the horizontal direction, and has a lower sliding portion 42 and an upper sliding portion 42. The moving portion 44 is connected so as to be relatively movable in the horizontal direction.
The laminated rubber 45 is formed in a square whose shape when viewed from the vertical direction is larger than the upper surface of the lower sliding portion 42 and the lower surface of the upper sliding portion 44, and the upper surface of the lower sliding portion 42 and the lower surface of the upper sliding portion 44. The edge portion 45a protrudes outward from the edge portion 42a of the lower sliding portion 42 and the edge portion 44a of the upper sliding portion 44 in a state of being arranged between the two.
The laminated rubber 45 is fixed to the upper surface of the lower sliding portion 42 and the lower surface of the upper sliding portion 44, respectively, and is supported by the support 48 fixed to the lower sliding portion 42 and the upper sliding portion 44. There is.

支持具４８は、下部摺動部４２に固定されて積層ゴム４５の下面の縁部近傍と当接する下側支持具４８１と、上部摺動部４４に固定されて積層ゴム４５の上面の縁部近傍と当接する上側支持具４８２と、を有している。
下側支持具４８１は、四方枠状に形成され、下部摺動部４２の側面の上縁部に沿って配置されている。下側支持具４８１は、下部摺動部４２の側面に当接して固定される下側固定板部４８１ａと、積層ゴム４５の下面の縁部近傍に当接して積層ゴム４５を支持する下側支持板部４８１ｂと、を有している。 The support 48 is fixed to the lower sliding portion 42 and comes into contact with the vicinity of the lower edge of the laminated rubber 45, and the support 48 is fixed to the upper sliding portion 44 and is fixed to the upper edge of the laminated rubber 45. It has an upper support 482 that comes into contact with the vicinity.
The lower support 481 is formed in a square frame shape and is arranged along the upper edge of the side surface of the lower sliding portion 42. The lower support 481 abuts on the side surface of the lower sliding portion 42 and is fixed to the lower fixing plate portion 481a, and the lower support 481 abuts on the vicinity of the edge portion of the lower surface of the laminated rubber 45 to support the laminated rubber 45. It has a support plate portion 481b and.

上側支持具４８２は、下側支持具４８１と上下方向に対称となる四方枠状に形成され、上部摺動部４４の側面の下縁部に沿って配置されている。上側支持具４８２は、上部摺動部４４の側面に当接して固定される上側固定板部４８２ａと、積層ゴム４５の上面の縁部近傍に当接して積層ゴム４５を支持する上側支持板部４８２ｂと、を有している。
積層ゴム４５の縁部近傍は、下側支持板部４８１ｂと上側支持板部４８２ｂとに上下方向から挟持されている。 The upper support 482 is formed in a square frame shape that is vertically symmetrical with the lower support 481, and is arranged along the lower edge of the side surface of the upper sliding portion 44. The upper support 482 has an upper fixing plate portion 482a that abuts and is fixed to the side surface of the upper sliding portion 44, and an upper support plate portion that abuts near the edge portion of the upper surface of the laminated rubber 45 to support the laminated rubber 45. It has 482b and.
The vicinity of the edge portion of the laminated rubber 45 is sandwiched between the lower support plate portion 481b and the upper support plate portion 482b from the vertical direction.

積層ゴム４５は、下部摺動部４２と上部摺動部４４とが水平方向に相対変位すると、下部摺動部４２と上部摺動部４４との相対変位に追従してゴム部分が弾性変形する。
そして、弾性変形したゴム部分の復元力（弾性すべり復元力）により下部摺動部４２と上部摺動部４４とが原位置に復元されるように構成されている。 In the laminated rubber 45, when the lower sliding portion 42 and the upper sliding portion 44 are relatively displaced in the horizontal direction, the rubber portion is elastically deformed following the relative displacement between the lower sliding portion 42 and the upper sliding portion 44. ..
The lower sliding portion 42 and the upper sliding portion 44 are configured to be restored to their original positions by the restoring force (elastic slip restoring force) of the elastically deformed rubber portion.

本実施形態では、積層ゴム４５は、せん断剛性Ｇ＝０．３４～０．３９Ｎ／ｍｍ^２（Ｇ４～Ｇ１０）程度で、厚さ寸法（ゴム厚）は２～４ｃｍとしている。
下部摺動部４２と上部摺動部４４との水平方向の相対変位量の最大値は、積層ゴム４５の厚さ寸法の２倍以下となるように設定され、本実施形態では４～８ｃｍとしている。積層ゴム４５は、水平方向の変位量が積層ゴム４５の厚さ寸法の２倍（２００％）以下の場合には、塑性変形せずに弾性変形するように設計されている。
例えば、積層ゴム４５の厚さ寸法が２ｃｍの場合は、下部摺動部４２と上部摺動部４４との水平方向の相対変位量の最大値が４ｃｍとなり、積層ゴム４５の水平方向の変位量が０～４ｃｍの場合には、塑性変形せずに弾性変形するように設計されている。
摺動子４の平面寸法は、面積が４×長期支持荷重／（摩擦材の基準面圧）程度となるように設定されている。 In the present embodiment, the laminated rubber 45 has a shear rigidity G of about 0.34 to 0.39 N / mm ² (G4 to G10) and a thickness dimension (rubber thickness) of 2 to 4 cm.
The maximum value of the horizontal relative displacement between the lower sliding portion 42 and the upper sliding portion 44 is set to be twice or less the thickness dimension of the laminated rubber 45, and is set to 4 to 8 cm in this embodiment. There is. The laminated rubber 45 is designed to be elastically deformed without plastic deformation when the amount of displacement in the horizontal direction is twice (200%) or less of the thickness dimension of the laminated rubber 45.
For example, when the thickness dimension of the laminated rubber 45 is 2 cm, the maximum value of the horizontal relative displacement between the lower sliding portion 42 and the upper sliding portion 44 is 4 cm, and the horizontal displacement amount of the laminated rubber 45 is 4 cm. When is 0 to 4 cm, it is designed to be elastically deformed without plastic deformation.
The plane dimension of the slider 4 is set so that the area is about 4 × long-term bearing load / (reference surface pressure of the friction material).

このような構成の免震機構１は、図５および図６に示すように、地震が生じて下部構造体１１と上部構造体１２とが水平方向に相対変位すると、下部構造体１１に設けられた下部案内部２と上部構造体１２に設けられた上部案内部３との相対変位に追従して積層ゴム４５が変形するとともに、摺動子４が下部摺動面２１および上部摺動面３１を摺動する。 As shown in FIGS. 5 and 6, the seismic isolation mechanism 1 having such a configuration is provided in the lower structure 11 when an earthquake occurs and the lower structure 11 and the upper structure 12 are relatively displaced in the horizontal direction. The laminated rubber 45 is deformed according to the relative displacement between the lower guide portion 2 and the upper guide portion 3 provided in the upper structure 12, and the slider 4 is formed on the lower sliding surface 21 and the upper sliding surface 31. Sliding.

図３および図４に示すように免震機構１の初期状態（通常時）では、積層ゴム４５は変形せず、摺動子４は下部案内部２および上部案内部３に対して原位置に配置されている。原位置に配置された摺動子４は、第１下部当接面４１２が下部案内部２の第１下部摺動面２１２と当接し、第２下部当接面４１３が下部案内部２の第２下部摺動面２１３と当接し、第１上部当接面４３２が上部案内部３の第１上部摺動面３１２と当接し、第２上部当接面４３３が上部案内部３の第２上部摺動面３１３と当接している。 As shown in FIGS. 3 and 4, in the initial state (normal state) of the seismic isolation mechanism 1, the laminated rubber 45 is not deformed, and the slider 4 is in the original position with respect to the lower guide portion 2 and the upper guide portion 3. Have been placed. In the slider 4 arranged in the original position, the first lower contact surface 412 abuts on the first lower sliding surface 212 of the lower guide portion 2, and the second lower contact surface 413 is the second lower guide portion 2. 2 The lower sliding surface 213 is in contact, the first upper contact surface 432 is in contact with the first upper sliding surface 312 of the upper guide portion 3, and the second upper contact surface 433 is the second upper portion of the upper guide portion 3. It is in contact with the sliding surface 313.

図５（ｂ）に示すように、摺動子４は、下部案内部２に対して原位置からＸ方向の一方側に移動すると、第１下部当接面４１２が第１下部摺動面２１２と当接しているが、第２下部当接面４１３が第２下部摺動面２１３から離間した状態で第１下部摺動面２１２を上るように下部摺動面２１を摺動する。摺動子４は、下部案内部２に対して原位置からＸ方向の他方側に移動すると、第２下部当接面４１３が第２下部摺動面２１３と当接しているが、第１下部当接面４１２が第１下部摺動面２１２から離間した状態で第２下部摺動面２１３を上るように下部摺動面２１を摺動する。 As shown in FIG. 5B, when the slider 4 moves from the original position to one side in the X direction with respect to the lower guide portion 2, the first lower contact surface 412 becomes the first lower sliding surface 212. However, the lower sliding surface 21 is slid so as to go up the first lower sliding surface 212 in a state where the second lower contact surface 413 is separated from the second lower sliding surface 213. When the slider 4 moves from the original position to the other side in the X direction with respect to the lower guide portion 2, the second lower contact surface 413 is in contact with the second lower sliding surface 213, but the first lower portion is in contact with the second lower sliding surface 213. The lower sliding surface 21 is slid so as to go up the second lower sliding surface 213 in a state where the contact surface 412 is separated from the first lower sliding surface 212.

また、摺動子４は、上部案内部３に対して原位置からＹ方向の一方側に移動すると、第１上部当接面４３２が第１上部摺動面３１２と当接しているが、第２上部当接面４３３が第２上部摺動面３１３から離間した状態で第１上部摺動面３１２を下るように上部摺動面３１を摺動する。摺動子４は、上部案内部３に対して原位置からＹ方向の他方側に移動すると、第２上部当接面４３３が第２上部摺動面３１３と当接しているが、第１上部当接面４３２が第１上部摺動面３１２から離間した状態で第２上部摺動面３１３を下るように上部摺動面３１を摺動する。 Further, when the slider 4 moves from the original position to one side in the Y direction with respect to the upper guide portion 3, the first upper contact surface 432 is in contact with the first upper sliding surface 312. 2 The upper sliding surface 31 is slid so as to go down the first upper sliding surface 312 in a state where the upper contact surface 433 is separated from the second upper sliding surface 313. When the slider 4 moves from the original position to the other side in the Y direction with respect to the upper guide portion 3, the second upper contact surface 433 is in contact with the second upper sliding surface 313, but the first upper portion The upper sliding surface 31 is slid so as to go down the second upper sliding surface 313 in a state where the contact surface 432 is separated from the first upper sliding surface 312.

このように摺動子４は、下部案内部２および上部案内部３に対して上ったり下ったりすることで高さ寸法が変化することになる。しかしながら、本実施形態では、免震層１３に設けられた複数の免震機構１は、それぞれの傾斜角度θが同じ値であるため、地震が生じてそれぞれの下部案内部２と上部案内部３とが水平方向に相対変位しても、免震機構１それぞれの上端部は同じ高さとなり、免震機構１それぞれの下端部は同じ高さに配置される。
これにより、下部構造体１１と上部構造体１２とが水平方向に相対変位しても、上部構造体１２が水平に維持される。 In this way, the height dimension of the slider 4 changes by moving up and down with respect to the lower guide portion 2 and the upper guide portion 3. However, in the present embodiment, since the plurality of seismic isolation mechanisms 1 provided in the seismic isolation layer 13 have the same inclination angle θ, an earthquake occurs and the lower guide portion 2 and the upper guide portion 3 respectively. Even if and are displaced relative to each other in the horizontal direction, the upper end portions of the seismic isolation mechanisms 1 are at the same height, and the lower end portions of the seismic isolation mechanisms 1 are arranged at the same height.
As a result, even if the lower structure 11 and the upper structure 12 are displaced relative to each other in the horizontal direction, the upper structure 12 is maintained horizontally.

免震機構１では、摺動子４と下部案内部２とがＸ方向に相対変位すると、摺動子４が下部案内部２の下部摺動面２１を上るように下部案内部２と相対変位するため、摺動子４と下部案内部２との相対変位がポテンシャルエネルギー（位置エネルギー）として蓄積され、摺動子４が原位置に復元するための復元力（傾斜復元力）となる。摺動子４と上部案内部３とがＹ方向に相対変位すると、上部案内部３が摺動子４の上部当接面４３の傾斜面を上るように摺動子４と相対変位するため、摺動子４と上部案内部３との相対変位がポテンシャルエネルギー（位置エネルギー）として蓄積され、摺動子４が原位置に復元するための復元力（傾斜復元力）となる。
上部案内部３に作用する鉛直荷重をＷとすると、傾斜復元力（水平力）Ｆは水平面に対する傾斜角度θをとしてＦ＝Ｗｔａｎθと表される。 In the seismic isolation mechanism 1, when the slider 4 and the lower guide portion 2 are displaced relative to each other in the X direction, the slider 4 is displaced relative to the lower guide portion 2 so as to go up the lower sliding surface 21 of the lower guide portion 2. Therefore, the relative displacement between the slider 4 and the lower guide portion 2 is accumulated as potential energy (potential energy), and becomes a restoring force (tilt restoring force) for the slider 4 to restore to the original position. When the slider 4 and the upper guide portion 3 are relatively displaced in the Y direction, the upper guide portion 3 is displaced relative to the slider 4 so as to go up the inclined surface of the upper contact surface 43 of the slider 4. The relative displacement between the slider 4 and the upper guide portion 3 is accumulated as potential energy (potential energy), and becomes a restoring force (tilt restoring force) for the slider 4 to restore to the original position.
Assuming that the vertical load acting on the upper guide portion 3 is W, the tilt restoring force (horizontal force) F is expressed as F = Wtan θ with the tilt angle θ with respect to the horizontal plane.

本実施形態では、図５（ａ）に示すような下部構造体１１と上部構造体１２との相対変位量が微小な場合には、積層ゴム４５が変形するのみで、摺動子４は下部摺動面２１および上部摺動面３１を摺動せず、図５（ｂ）に示すような上部構造体１２と下部構造体１１との相対変位量が大きくなり、積層ゴム４５の原位置に対する水平変位が所定の水平変位設定値を超えた場合には、摺動子４が下部摺動面２１および上部摺動面３１を摺動するように構成されている。 In the present embodiment, when the relative displacement between the lower structure 11 and the upper structure 12 as shown in FIG. 5A is small, the laminated rubber 45 is only deformed and the slider 4 is at the lower part. The sliding surface 21 and the upper sliding surface 31 are not slid, and the relative displacement amount between the upper structure 12 and the lower structure 11 as shown in FIG. 5B becomes large, and the relative displacement amount with respect to the original position of the laminated rubber 45 becomes large. When the horizontal displacement exceeds a predetermined horizontal displacement set value, the slider 4 is configured to slide on the lower sliding surface 21 and the upper sliding surface 31.

本実施形態による免震機構１（傾斜弾性すべり支承）の復元力特性（荷重－変形関係）を図６に示す。すべりを生じた後の摩擦抵抗力μＷは、一般的に傾斜復元力Ｗｔａｎθより大きく、両者を合成したものが免震機構１の復元力特性となる。 FIG. 6 shows the restoring force characteristics (load-deformation relationship) of the seismic isolation mechanism 1 (tilt elastic sliding bearing) according to the present embodiment. The frictional resistance force μW after slipping is generally larger than the tilt restoring force Wtan θ, and the combination of the two is the restoring force characteristic of the seismic isolation mechanism 1.

次に、上述した本実施形態による免震機構１の作用・効果について図面を用いて説明する。
上述した本実施形態による免震機構１では、地震が生じ、下部構造体１１と上部構造体１２とが水平方向に相対変位すると、まず、摺動子４は上部摺動面および下部摺動面２１に対して摺動せずに、積層ゴム４５のみが変形する。ここから更に下部構造体１１と上部構造体１２とが水平方向に相対変位して、積層ゴム４５の原位置に対する水平変位が所定の水平変位設定値を超えると、摺動子４が上部摺動面および下部摺動面２１に対して摺動し始める。
これにより、摺動子４が傾斜面の傾斜角度が切り替わる箇所を通過する際に衝撃が生じたり、スティックスリップ現象の衝撃が生じたりした場合でも、積層ゴム４５が変形することにより衝撃を吸収できるため、摺動子４に生じる加速度を低減させることができる。 Next, the operation / effect of the seismic isolation mechanism 1 according to the above-described embodiment will be described with reference to the drawings.
In the seismic isolation mechanism 1 according to the above-described embodiment, when an earthquake occurs and the lower structure 11 and the upper structure 12 are relatively displaced in the horizontal direction, first, the slider 4 has an upper sliding surface and a lower sliding surface. Only the laminated rubber 45 is deformed without sliding with respect to 21. From here, when the lower structure 11 and the upper structure 12 are further displaced in the horizontal direction and the horizontal displacement of the laminated rubber 45 with respect to the in-situ position exceeds a predetermined horizontal displacement set value, the slider 4 slides upward. It begins to slide with respect to the surface and the lower sliding surface 21.
As a result, even if an impact is generated when the slider 4 passes through a portion where the inclination angle of the inclined surface is switched, or an impact of a stick-slip phenomenon is generated, the impact can be absorbed by the deformation of the laminated rubber 45. Therefore, the acceleration generated in the slider 4 can be reduced.

また、図７に示すように、傾斜滑り支承のみの免震機構と比べて、積層ゴム４５の変形によって免震機構の上部の構造に起因する高周波成分を低減させることができるため、構造物の上階層や下階層に生じる加速度を低減させることができる。
そして、下部摺動部４２と上部摺動部４４との水平方向の相対変位量の最大値が、積層ゴム４５の厚さ寸法の２倍以下に設定され、積層ゴム４５は、水平方向の変形量が厚さ寸法の２倍以下の場合には弾性変形し塑性変形しないことにより、積層ゴム４５に確実に減衰性能が付与されるため、加速度の低減効果を高めることができる。 Further, as shown in FIG. 7, as compared with the seismic isolation mechanism having only the inclined sliding bearing, the deformation of the laminated rubber 45 can reduce the high frequency component caused by the structure of the upper part of the seismic isolation mechanism, so that the structure can be reduced. It is possible to reduce the acceleration generated in the upper and lower layers.
Then, the maximum value of the relative displacement amount in the horizontal direction between the lower sliding portion 42 and the upper sliding portion 44 is set to be twice or less the thickness dimension of the laminated rubber 45, and the laminated rubber 45 is deformed in the horizontal direction. When the amount is twice or less the thickness dimension, the laminated rubber 45 is surely imparted with damping performance by elastically deforming and not plastically deforming, so that the effect of reducing acceleration can be enhanced.

また、積層ゴム４５は、上下方向から見て縁部が下部摺動部４２および上部摺動部４４よりも外側に突出し、縁部が下部摺動部４２および上部摺動部４４に固定された支持具４８で上下方向から挟持されている。これにより、積層ゴム４５を下部摺動部４２および上部摺動部４４に確実に固定することができる。また、積層ゴム４５の上下方向から見た形状を下部摺動部４２および上部摺動部４４よりも大きくすることができるため、下部摺動部４２および上部摺動部４４の形状にかかわらず積層ゴム４５の形状を設定することができる。 Further, in the laminated rubber 45, the edge portion protrudes outward from the lower sliding portion 42 and the upper sliding portion 44 when viewed from the vertical direction, and the edge portion is fixed to the lower sliding portion 42 and the upper sliding portion 44. It is sandwiched by the support 48 from above and below. As a result, the laminated rubber 45 can be securely fixed to the lower sliding portion 42 and the upper sliding portion 44. Further, since the shape of the laminated rubber 45 seen from the vertical direction can be made larger than that of the lower sliding portion 42 and the upper sliding portion 44, the laminated rubber 45 is laminated regardless of the shapes of the lower sliding portion 42 and the upper sliding portion 44. The shape of the rubber 45 can be set.

次に、本実施形態による免震機構１（「傾斜弾性すべり支承」とする）、積層ゴム支承（「ＬＲＢ」とする）、および傾斜すべり支承の減衰性能について解析行った。以下に、解析内容と解析結果について説明する。
図８に示すように、解析対象となる構造物は、３階建ＲＣ造の建物で、平面形状が２８ｍ×２１ｍの長方形となっている。免震層１３は、地盤と１階の間に介在している。免震層１３には、７ｍピッチで免震支承が設置されている。 Next, the seismic isolation mechanism 1 (referred to as “tilted elastic sliding bearing”), the laminated rubber bearing (referred to as “LRB”), and the damping performance of the inclined sliding bearing according to the present embodiment were analyzed. The analysis contents and analysis results will be described below.
As shown in FIG. 8, the structure to be analyzed is a three-story RC building, which is a rectangle having a plane shape of 28 m × 21 m. The seismic isolation layer 13 is interposed between the ground and the first floor. Seismic isolation bearings are installed on the seismic isolation layer 13 at a pitch of 7 m.

構造物の各階の重量ｍ１～ｍ４、水平剛性ｋ１～ｋ３、全重量Ｗは、以下のように設定されている。
ｍ１＝１１９９２００（ｋｇ）
ｍ４＝ｍ３＝ｍ２＝７１９５００（ｋｇ）
ｋ１＝ｋ２＝ｋ３＝３．２５ｅ９（Ｎ／ｍ）
Ｗ＝（ｍ１＋ｍ２＋ｍ３＋ｍ４）×９．８＝３２９０５４６０（Ｎ） The weight m1 to m4, the horizontal rigidity k1 to k3, and the total weight W of each floor of the structure are set as follows.
m1 = 1199200 (kg)
m4 = m3 = m2 = 719500 (kg)
k1 = k2 = k3 = 3.25e9 (N / m)
W = (m1 + m2 + m3 + m4) x 9.8 = 32905460 (N)

各免震支承の仕様は、以下のように設定されている。
ＬＲＢ（鉛プラグ入り積層ゴム）：せん断剛性Ｇ＝０．３９（Ｎ／ｍｍ^２）
傾斜すべり支承：摩擦係数μ＝０．０５、傾斜角度θ＝１．５°（理論加速度：０．７６ｍ／ｓ^２）、積層ゴムのせん断剛性ｋ_ｒｂ＝{Ｗ×（０．０５＋ｔａｎ１．５°）}／摺動子４の積層ゴムに設定する最大変位量Δ_ｍａｘ
傾斜弾性すべり支承：摩擦係数μ＝０．０５、傾斜角度θ＝１．５°（理論加速度：０．７６ｍ／ｓ^２）、積層ゴムのせん断剛性ｋ_ｒｂ＝{Ｗ×（０．０５＋ｔａｎ１．５°）}／摺動子４の積層ゴムに設定する最大変位量Δ_ｍａｘ The specifications of each seismic isolation bearing are set as follows.
LRB (laminated rubber with lead plug): Shear rigidity G = 0.39 (N / mm ² )
Tilt slip bearing: friction coefficient μ = 0.05, tilt angle θ = 1.5 ° (theoretical acceleration: 0.76 m / s ² ), shear rigidity of laminated rubber _krb = {W × (0.05 + tan 1.5 °) )} / Maximum displacement amount set for the laminated rubber of the slider 4 Δ _max
Tilt elastic sliding bearings: friction coefficient μ = 0.05, tilt angle θ = 1.5 ° (theoretical acceleration: 0.76 m / s ² ), shear rigidity of laminated rubber krb = {W × (0.05 + _tan1.5 ) °)} / Maximum displacement amount set for the laminated rubber of the slider 4 Δ _max

傾斜弾性すべり支承の摺動子４の積層ゴムの最大変位量Δ_ｍａｘ＝１～８ｃｍとし、傾斜弾性すべり支承の摺動子４の積層ゴムの減衰定数ｈを無し、ｈ＝１～５％とする。
計算用地震波には、以下の表のケース１～７の加振波形を採用する。 The maximum displacement of the laminated rubber of the slanted elastic sliding bearing 4 is Δ _max = 1 to 8 cm, and the damping constant h of the laminated rubber of the slanted elastic sliding bearing 4 is set to h = 1 to 5%. do.
For the seismic wave for calculation, the vibration waveforms of cases 1 to 7 in the table below are adopted.

図９～図１５に加振波形のケース１～７毎の各階の最大応答変位の比較、各階の最大応答加速度の比較、摺動子の積層ゴムに生じる変位と残留変位との比較を示す。
最大応答変位の比較、最大応答加速度の比較の図には、免震装置をＬＲＢとした結果および傾斜滑り支承とした結果も記載している。また、応答加速度の比較の図には、免震層１３の上部構造体１２を剛体でモデル化した理論値を表記している。
図１６～図２２に、加振波形のケース１～７毎の積層ゴムの最大変位量Δ_ｍａｘが４ｃｍ、減衰定数ｈ（０％～５％）の場合の各階の応答変位および応答加速度を示し、図２３～図２９には、加振波形のケース１～７毎の最大変位量Δ_ｍａｘが８ｃｍ、減衰定数ｈ（０％～５％）の場合の各階の応答変位および応答加速度を示す。
また、図３０（ａ）～（ｇ）に、加振波形のケース１～７毎の積層ゴムの減衰定数ｈ（０％～５％）の場合の免震層の最大変位量と残留変位との比較を示す。 9 to 15 show a comparison of the maximum response displacement of each floor for each of the vibration waveform cases 1 to 7, a comparison of the maximum response acceleration of each floor, and a comparison of the displacement generated in the laminated rubber of the slider and the residual displacement.
The figures of the comparison of the maximum response displacement and the comparison of the maximum response acceleration also show the result of using the seismic isolation device as LRB and the result of using the inclined sliding bearing. Further, in the figure of comparison of response accelerations, theoretical values obtained by modeling the superstructure 12 of the seismic isolation layer 13 with a rigid body are shown.
16 to 22 show the response displacement and response acceleration of each floor when the maximum displacement amount _Δmax of the laminated rubber for each case 1 to 7 of the vibration waveform is 4 cm and the damping constant h (0% to 5%). 23 to 29 show the response displacement and response acceleration of each floor when the maximum displacement amount _Δmax for each case 1 to 7 of the vibration waveform is 8 cm and the damping constant h (0% to 5%).
Further, FIGS. 30 (a) to 30 (g) show the maximum displacement amount and the residual displacement of the seismic isolation layer in the case of the damping constant h (0% to 5%) of the laminated rubber for each of the cases 1 to 7 of the vibration waveform. The comparison is shown.

以上のことより、傾斜弾性すべり支承の積層ゴムは、最大変形量を４ｃｍ以上に設定すれば、傾斜すべり支承の課題である減衰力不足を解消し、理論加速度（０．７６ｍ／ｓ^２）に近づくことがわかる。また、ＬＲＢの応答結果（加速度）よりも小さく高い免震性能が得られることがわかる。特に、積層ゴムのせん断剛性ｋ_ｒｂ＝{Ｗ×（０．０５＋ｔａｎ１．５°）}／摺動子４の積層ゴムに設定する最大変位量Δ_ｍａｘとすることでより高い免震性能を得られることがわかる。
傾斜すべり支承の残留変位は、傾斜すべり支承と同等に約０となることがわかる。傾斜弾性支承の積層ゴムの減衰による上部構造物の計算結果（応答変位と応答加速度）には、あまり違いが無かったが、残留変位の差異が大きいことがわかる。
減衰定数０～５％の計算結果（応答変位、応答加速度、残留変位）より、無減衰とせずｈ≧１％の減衰を付与すればいずれの応答結果も略同じとなることがわかる。 From the above, the laminated rubber of the inclined elastic sliding bearing can solve the problem of insufficient damping force of the inclined sliding bearing by setting the maximum deformation amount to 4 cm or more, and achieve the theoretical acceleration (0.76 m / s ² ). You can see that it is approaching. Further, it can be seen that a high seismic isolation performance can be obtained, which is smaller than the response result (acceleration) of the LRB. In particular, higher seismic isolation performance can be obtained by setting the shear rigidity of the laminated rubber k _rb = {W × (0.05 + tan1.5 °)} / maximum displacement amount _Δmax set for the laminated rubber of the slider 4. You can see that.
It can be seen that the residual displacement of the tilted sliding bearing is about 0, which is equivalent to that of the tilted sliding bearing. Although there was not much difference in the calculation results (response displacement and response acceleration) of the superstructure due to the damping of the laminated rubber of the inclined elastic bearing, it can be seen that the difference in the residual displacement is large.
From the calculation results (response displacement, response acceleration, residual displacement) with a damping constant of 0 to 5%, it can be seen that all response results are substantially the same if h ≧ 1% damping is applied without damping.

以上、本発明による免震機構１の実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。
例えば、上記の実施形態では、積層ゴム４５は、上下方向から見た形状が下部摺動部４２の上面および上部摺動部４４の下面よりも大きい正方形に形成され、下部摺動部４２の上面と上部摺動部４４の下面との間に配置された状態で、縁部４５ａが下部摺動部４２の上面の縁部４２ａおよび上部摺動部４４の下面の縁部４４ａよりも外側に突出している。そして、積層ゴム４５の縁部４５ａは、下部摺動部４２および上部摺動部４４に固定された支持具４８で上下方向から挟持されている。これに対し、積層ゴム４５は、上下方向から見た形状が下部摺動部および上部摺動部４４よりも外側に突出していなくてもよいし、下部摺動部および上部摺動部４４への固定手段も適宜設定されてよい。
また、上記の実施形態では、積層ゴム４５の厚さ寸法を２ｃｍから４ｃｍとしているが、積層ゴム４５の厚さ寸法は適宜設定されてよい。 Although the embodiment of the seismic isolation mechanism 1 according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified without departing from the spirit of the present invention.
For example, in the above embodiment, the laminated rubber 45 is formed into a square whose shape when viewed from the vertical direction is larger than the upper surface of the lower sliding portion 42 and the lower surface of the upper sliding portion 44, and the upper surface of the lower sliding portion 42 is formed. In a state of being arranged between the upper sliding portion 44 and the lower surface of the upper sliding portion 44, the edge portion 45a protrudes outward from the upper surface edge portion 42a of the lower sliding portion 42 and the lower surface edge portion 44a of the upper sliding portion 44. ing. The edge portion 45a of the laminated rubber 45 is sandwiched from above and below by the support 48 fixed to the lower sliding portion 42 and the upper sliding portion 44. On the other hand, the laminated rubber 45 does not have to have a shape seen from the vertical direction protruding outward from the lower sliding portion and the upper sliding portion 44, and may extend to the lower sliding portion and the upper sliding portion 44. The fixing means may also be set as appropriate.
Further, in the above embodiment, the thickness dimension of the laminated rubber 45 is set to 2 cm to 4 cm, but the thickness dimension of the laminated rubber 45 may be appropriately set.

１免震機構
２下部案内部
３上部案内部
４摺動子
１１下部構造体
１２上部構造体
１３免震層
２１下部摺動面
３１上部摺動面
４１下部当接面
４２下部摺動部
４３上部当接面
４４上部摺動部
４５積層ゴム
４８支持具 1 Seismic isolation mechanism 2 Lower guide part 3 Upper guide part 4 Slider 11 Lower structure 12 Upper structure 13 Seismic isolation layer 21 Lower sliding surface 31 Upper sliding surface 41 Lower contact surface 42 Lower sliding part 43 Upper Contact surface 44 Upper sliding part 45 Laminated rubber 48 Support

Claims

In the seismic isolation mechanism provided between the lower structure and the upper structure that can be displaced relative to each other in the horizontal direction.
A lower guide portion provided on the upper part of the lower structure and having a lower sliding surface formed in a V shape that is convex downward along one horizontal direction.
An upper guide portion provided at the bottom of the upper structure and having an upper sliding surface formed in an inverted V shape that is convex upward along the other horizontal direction orthogonal to the horizontal direction.
It is arranged between the lower sliding surface and the upper sliding surface, and can be displaced relative to the lower guide portion in the horizontal direction along the lower sliding surface, and on the upper sliding surface. Along with the upper guide and the other horizontally displaceable sliders,
The slider includes a lower sliding portion capable of sliding the lower sliding surface, an upper sliding portion arranged above the lower sliding portion and slidable on the upper sliding surface, and the above. It has a laminated rubber that is arranged between the lower sliding portion and the upper sliding portion and supports the lower sliding portion and the upper sliding portion so as to be relatively movable in the horizontal direction.
When the lower structure and the upper structure are relatively displaced in the horizontal direction, the laminated rubber is deformed in the horizontal direction following the relative displacement, and the horizontal displacement of the laminated rubber with respect to the in-situ position is set to a predetermined horizontal displacement. After exceeding the value, the slider is configured to slide on at least one of the lower sliding surface and the upper sliding surface.
The maximum value of the horizontal relative displacement between the lower sliding portion and the upper sliding portion is set to be twice or less the thickness dimension of the laminated rubber.
When the amount of deformation in the horizontal direction is twice or less the thickness dimension of the laminated rubber, the laminated rubber elastically deforms and does not plastically deform.
The laminated rubber has a lower support whose edge portion protrudes outward from the lower sliding portion and the upper sliding portion when viewed from the vertical direction, and the edge portion is fixed to the lower sliding portion, and the upper portion. It is sandwiched from above and below by the upper support fixed to the sliding part,
The lower support is
The lower fixing plate portion that abuts and is fixed only to the side surface of the lower sliding portion,
A lower support plate portion that projects laterally from the upper end portion of the lower fixing plate portion and abuts on the lower surface of the edge portion of the laminated rubber at the height of the upper surface of the lower sliding portion to support the laminated rubber. And, the cross-sectional shape is L-shaped,
The upper support is
An upper fixing plate portion that abuts and is fixed only to the side surface of the upper sliding portion,
An upper support plate portion that projects laterally from the lower end portion of the upper fixed plate portion and abuts on the upper surface of the edge portion of the laminated rubber at the height of the lower surface of the upper sliding portion to support the laminated rubber. A seismic isolation mechanism characterized by having an L-shaped cross section .

The shear rigidity _Krb of the laminated rubber is
Shear rigidity K _rb of the laminated rubber = own weight W × ( friction coefficient μ + tan inclination angle θ) of the superstructure / maximum displacement amount Δ _max set for the laminated rubber of the slider
The seismic isolation mechanism according to claim 1, wherein the seismic isolation mechanism is set in 1.