JP6456647B2

JP6456647B2 - Seismic isolation structure for structures using laminated rubber seismic isolation device and sliding bearing seismic isolation device

Info

Publication number: JP6456647B2
Application number: JP2014203764A
Authority: JP
Inventors: 田中　良一; 良一田中; 増田　圭司; 圭司増田; 佐々木　聡; 聡佐々木
Original assignee: Fujita Corp
Current assignee: Fujita Corp
Priority date: 2014-10-02
Filing date: 2014-10-02
Publication date: 2019-01-23
Anticipated expiration: 2034-10-02
Also published as: JP2016070474A

Description

本発明は、積層ゴム免震装置とすべり支承免震装置とを併用した構造物の免震構造に関する。 The present invention relates to a seismic isolation structure for a structure using a laminated rubber seismic isolation device and a sliding bearing seismic isolation device in combination.

コンクリート造建物などの構造物の免震構造として、構造物の上部構造体と下部構造体との間の複数の支持箇所の各々に免震装置を介装し、それら免震装置によって上部構造体を支持するようにした免震構造が広く採用されている。また、そのための免震装置としては、積層ゴム免震装置、すべり支承免震装置、転がり支承免震装置、それに、それらのうちの２種類以上を組合せて構成した複合免震装置などが用いられている。 As a seismic isolation structure for a structure such as a concrete building, a seismic isolation device is installed in each of a plurality of support points between the upper structure and the lower structure of the structure, and the upper structure is separated by the seismic isolation device. The seismic isolation structure is widely adopted so that it can be supported. In addition, as a seismic isolation device for that purpose, a laminated rubber seismic isolation device, a sliding bearing seismic isolation device, a rolling bearing seismic isolation device, and a composite seismic isolation device configured by combining two or more of them are used. ing.

積層ゴム免震装置を使用する免震構造では、水平方向ダンパや、作動した免震装置を中立位置へ復帰させる復帰機構などを省略または簡易化することができ、ひいては免震構造の全体を簡明なものとすることができる。その一方で、積層ゴム免震装置は、その他の免震装置と比べて水平剛性が比較的大きいため、地震振動の遮断性能に関しては、やや劣りがちである。 In seismic isolation systems that use laminated rubber seismic isolation devices, horizontal dampers and return mechanisms that return activated seismic isolation devices to their neutral positions can be omitted or simplified, and the overall seismic isolation structure is simplified. Can be. On the other hand, laminated rubber seismic isolation devices tend to be somewhat inferior in terms of seismic vibration isolation performance because of their relatively high horizontal rigidity compared to other seismic isolation devices.

そこで、かかる免震構造における複数の支持箇所のうちの、幾つかの支持箇所では積層ゴム免震装置を使用し、その他の支持箇所ではすべり支承免震装置を使用するようにすれば、構造の簡明性と地震振動の遮断性能との双方に優れた免震構造を設計し得る可能性があるが、ただしその場合には、それら免震装置の作動時における沈下量が問題になる。 Therefore, if a laminated rubber seismic isolation device is used at some of the support locations in the seismic isolation structure, and a sliding bearing isolation device is used at other support locations, There is a possibility that a seismic isolation structure excellent in both simplicity and seismic vibration isolation performance may be designed, but in that case, the amount of settlement during operation of these seismic isolation devices becomes a problem.

即ち、従来のすべり支承免震装置は、例えば特許文献１、特許文献２などに示されているように、水平方向に延在する平面形状のすべり面上をすべり材が滑動する構成であるため、その作動時にすべり支承免震装置の上端が沈下することはない。これに対して積層ボム免震装置は、水平方向に大きな変形を生じたときに、免震装置の上端が明瞭に沈下し、場合によってはその沈下量が数ｍｍにも達することがある。そのため、上述したように、幾つかの支持箇所では積層ゴム免震装置を使用し、その他の支持箇所ではすべり支承免震装置を使用するようにして、積層ゴム免震装置とすべり支承免震装置とを併用した免震構造では、地震発生時に積層ゴム免震装置を設置した支持箇所だけが鉛直方向に沈下することになる。 That is, the conventional sliding bearing seismic isolation device has a configuration in which the sliding material slides on a planar sliding surface extending in the horizontal direction as shown in, for example, Patent Document 1 and Patent Document 2. The upper end of the sliding bearing isolation device does not sink during its operation. On the other hand, when the laminated bomb seismic isolation device is largely deformed in the horizontal direction, the upper end of the seismic isolation device clearly sinks, and in some cases, the amount of subsidence may reach several millimeters. Therefore, as described above, the laminated rubber seismic isolation device and the sliding bearing seismic isolation device are used by using the laminated rubber seismic isolation device at some supporting locations and using the sliding bearing isolation device at other supporting locations. In the seismic isolation structure used in combination, only the support location where the laminated rubber seismic isolation device is installed sinks in the vertical direction when an earthquake occurs.

これを図示したのが図８である。図中、免震構造９０を備えた構造物は上部構造体９２と下部構造体９４とに分割して構築されており、上部構造体９２は例えば建物躯体、下部構造体９４は例えばその建物の基礎を成すフーチングなどである。構造物９０の上部構造体９２と下部構造体９４との間の複数の支持箇所の各々に免震装置９２、９４が介装されており、そら免震装置９２、９４によって上部構造体９２が支持されている。複数の支持箇所のうちの幾つかの支持箇所では積層ゴム免震装置９２が使用され、その他の支持箇所では従来のすべり支承免震装置９４が使用され、これによって、積層ゴム免震装置とすべり支承免震装置とを併用した免震構造が構成されている。そして、積層ゴム免震装置９２が作動時に沈下を発生するのに対して、すべり支承免震装置９４は作動時に沈下を発生しないことから、地震発生時には、図示したように、それら免震装置９２、９４によって支持された上部構造の梁に曲げ応力が作用し、そのスパン間に変位角が生じている。 This is illustrated in FIG. In the figure, the structure provided with the seismic isolation structure 90 is divided into an upper structure 92 and a lower structure 94. The upper structure 92 is, for example, a building housing, and the lower structure 94 is, for example, the building structure. Such as the footing that forms the basis. Seismic isolation devices 92, 94 are interposed at each of a plurality of support locations between the upper structure 92 and the lower structure 94 of the structure 90, and the upper structure 92 is formed by the seismic isolation devices 92, 94. It is supported. A laminated rubber seismic isolation device 92 is used at some of the plurality of supporting locations, and a conventional sliding bearing isolation device 94 is used at the other supporting locations. The seismic isolation structure is used in combination with the base isolation system. Since the laminated rubber seismic isolation device 92 generates subsidence during operation, the sliding bearing base isolation device 94 does not generate subsidence during operation. , 94 is subjected to bending stress on the superstructure beam, and a displacement angle is generated between the spans.

特開２０１０−５４０５０JP 2010-54050 A 特開２０１０−２０３１４３JP 2010-203143 A

したがって、幾つかの支持箇所では積層ゴム免震装置を使用し、その他の支持箇所ではすべり支承免震装置を使用する免震構造を、従来のすべり支承免震装置を用いて構成したならば、地震発生時に、それまで積層ゴム免震装置が負担していた鉛直荷重の一部がすべり支承免震装置に転嫁され、すべり支承免震装置に過大な鉛直荷重が作用するという不都合をきたすおそれがある。また、積層ゴム免震装置の設置箇所とすべり支承免震装置の設置箇所との間で鉛直方向の変位差を生じることから、図８に示したように、各免震装置に支持された上部構造の梁に有害な応力およびスパン間の変位角が生じるという不都合もきたしかねない。 Therefore, if a seismic isolation structure using a laminated rubber seismic isolation device at some supporting locations and a sliding bearing seismic isolation device at other supporting locations is configured using a conventional sliding bearing isolation device, When an earthquake occurs, part of the vertical load previously borne by the laminated rubber seismic isolation device may be transferred to the sliding bearing seismic isolation device, which may cause inconvenience that an excessive vertical load acts on the sliding bearing seismic isolation device. is there. Further, since a vertical displacement difference is generated between the installation location of the laminated rubber seismic isolation device and the installation location of the sliding bearing isolation device, as shown in FIG. 8, the upper part supported by each seismic isolation device There can also be the disadvantage that destructive stresses and displacement angles between spans occur in the structural beam.

本発明はかかる事情に鑑み成されたものであり、本発明の目的は、構造物の上部構造体と下部構造体との間の複数の支持箇所の各々に免震装置を介装し、それら免震装置によって前記上部構造体を支持するようにした免震構造において、前記複数の支持箇所のうちの幾つかの支持箇所では積層ゴム免震装置を使用し、その他の支持箇所では上記すべり支承免震装置を使用することにより、積層ゴム免震装置とすべり支承免震装置とを併用した構成とする場合に、地震発生時の各免震装置の設置箇所における鉛直変位差を解消ないし抑制して、各免震装置に支持された上部構造の梁に生じる応力およびスパン間の変位角を緩和することのできる免震構造を提供することにある。 The present invention has been made in view of such circumstances, and an object of the present invention is to install a seismic isolation device in each of a plurality of support locations between an upper structure and a lower structure of a structure. in seismic isolation structure so as to support the upper structure by which we isolator, wherein in some of the support portions of the plurality of supporting locations using laminated rubber isolator, said in other support points By using a sliding bearing seismic isolation device, if the laminated rubber seismic isolation device and the sliding bearing seismic isolation device are combined, the vertical displacement difference at the location of each seismic isolation device at the time of the earthquake will not be eliminated. An object of the present invention is to provide a seismic isolation structure capable of suppressing the stress generated in the superstructure beam supported by each seismic isolation device and the displacement angle between spans.

上記目的を達成するため、本発明に係る構造物の免震構造は、構造物の上部構造体と下部構造体との間の複数の支持箇所の各々に免震装置を介装し、それら免震装置によって前記上部構造体を支持するようにした構造物の免震構造において、前記複数の支持箇所のうちの幾つかの支持箇所では積層ゴム免震装置を使用し、その他の支持箇所ではすべり支承免震装置を使用することにより、積層ゴム免震装置とすべり支承免震装置とを併用しており、前記すべり支承免震装置は、前記下部構造体の側に連結されて略々水平に延展するすべり板と、前記上部構造体の側に連結されるすべり材とを備え、前記すべり板はその上面がすべり面を画成しており、前記すべり材はその下面が前記すべり面に摺接する摺接面を画成しており、前記すべり材が前記すべり板の前記すべり面上を滑動することで前記上部構造体の前記下部構造体に対する水平方向の相対移動が許容されるようにしてあり、前記すべり板の前記すべり面は略々部分球面形状を成す凸面形状に形成されており、それによって、前記すべり材が前記すべり板に対して相対的に水平方向に偏位して中立位置から離れるにつれて前記すべり材が鉛直下方へ偏位するようにしてあり、前記積層ゴム免震装置の作動時の沈下量と前記すべり支承免震装置の作動時の沈下量とを実質的に等しくしてあることを特徴とする。 In order to achieve the above object, the seismic isolation structure for a structure according to the present invention is provided with a seismic isolation device at each of a plurality of support locations between the upper structure and the lower structure of the structure. In a seismic isolation structure for a structure that supports the upper structure by a seismic device, a laminated rubber seismic isolation device is used at some of the plurality of support locations, and slipping occurs at other support locations. By using a bearing seismic isolation device, a laminated rubber seismic isolation device and a sliding bearing seismic isolation device are used in combination, and the sliding bearing seismic isolation device is connected to the lower structure side and is substantially horizontal. A sliding plate extending to the upper structure side; and an upper surface of the sliding plate defines a sliding surface, and the lower surface of the sliding material slides on the sliding surface. A sliding contact surface is formed, and the sliding material is By sliding on the sliding surface of the sliding plate, horizontal movement of the upper structure with respect to the lower structure is allowed, and the sliding surface of the sliding plate is substantially partially spherical. As a result, the sliding material is displaced in the horizontal direction relative to the sliding plate so that the sliding material is displaced vertically downward as it moves away from the neutral position. Thea is, characterized by a substantially equal Citea Rukoto and subsidence during operation of subsidence during operation of the laminated rubber isolator and the sliding bearing isolator.

また、本発明に係る構造物の免震構造は、構造物の上部構造体と下部構造体との間の複数の支持箇所の各々に免震装置を介装し、それら免震装置によって前記上部構造体を支持するようにした構造物の免震構造において、前記複数の支持箇所のうちの幾つかの支持箇所では積層ゴム免震装置を使用し、その他の支持箇所ではすべり支承免震装置を使用することにより、積層ゴム免震装置とすべり支承免震装置とを併用しており、前記すべり支承免震装置は、前記下部構造体の側に連結されて略々水平に延展する第１すべり板と、前記上部構造体の側に連結されて略々水平に延展する第２すべり板と、前記第１すべり板と前記第２すべり板との間に配設されるすべり材とを備え、前記第１すべり板はその上面が第１すべり面を画成しており、前記第２すべり板はその下面が第２すべり面を画成しており、前記すべり材はその下面が前記第１すべり面に摺接する第１摺接面を画成し、その上面が前記第２すべり面に摺接する第２摺接面を画成しており、前記すべり材が前記第１及び第２すべり板の前記第１及び第２すべり面上を滑動することで前記上部構造体の前記下部構造体に対する水平方向の相対移動が許容されるようにしてあり、前記第１及び第２すべり板の前記第１及び第２すべり面は略々部分球面形状を成す凸面形状に形成されており、それによって、前記第２すべり板が前記第１すべり板に対して相対的に水平方向に偏位して中立位置から離れるにつれて前記第２すべり材が鉛直下方へ偏位するようにしてあり、前記積層ゴム免震装置の作動時の沈下量と前記すべり支承免震装置の作動時の沈下量とを実質的に等しくしてあることを特徴とする。 Moreover, the seismic isolation structure of the structure according to the present invention includes a seismic isolation device in each of a plurality of supporting locations between the upper structure and the lower structure of the structure, and the upper part is separated by the seismic isolation device. In a seismic isolation structure for a structure that supports a structure, a laminated rubber seismic isolation device is used at some of the plurality of supporting locations, and a sliding bearing isolation device is installed at other supporting locations. When used, a laminated rubber seismic isolation device and a sliding bearing isolation device are used together, and the sliding bearing isolation device is connected to the lower structure side and extends substantially horizontally. A plate, a second sliding plate connected to the upper structure side and extending substantially horizontally, and a sliding material disposed between the first sliding plate and the second sliding plate, The upper surface of the first sliding plate defines a first sliding surface, and the front The second sliding plate has a lower surface defining a second sliding surface, and the sliding material defines a first sliding contact surface whose lower surface is in sliding contact with the first sliding surface, and an upper surface thereof is the second sliding surface. A second sliding contact surface is formed that slides on the sliding surface, and the sliding member slides on the first and second sliding surfaces of the first and second sliding plates, thereby the upper structure body; A relative movement in the horizontal direction with respect to the lower structure is allowed, and the first and second sliding surfaces of the first and second sliding plates are formed in a convex shape having a substantially spherical shape. thereby, Ri Citea so deviates to the second sliding member is vertically downward as the second sliding plate moves away from the neutral position displaced relatively horizontal direction with respect to the first sliding plate , The amount of subsidence during operation of the laminated rubber seismic isolation device and the slip bearing exemption And subsidence during operation of the device features a substantially equal Citea Rukoto.

本発明に係る免震構造によれば、積層ゴム免震装置とすべり支承免震装置とを併用した免震構造において、地震発生時の各免震装置の支持箇所における鉛直変位差を解消ないし抑制し、各免震装置に支持された上部構造の梁に生じる応力およびスパン間の変位角を緩和することができる。 According to the seismic isolation structure of the present invention, in a seismic isolation structure using both a laminated rubber seismic isolation device and a sliding bearing isolation device, the vertical displacement difference at the support location of each seismic isolation device when an earthquake occurs is eliminated or suppressed. In addition, the stress generated in the superstructure beam supported by each seismic isolation device and the displacement angle between the spans can be reduced.

本発明の第１の実施の形態に係るすべり支承免震装置の断面側面図であり、すべり支承免震装置が中立位置にある状態を示した図である。It is a sectional side view of the slide bearing seismic isolation device concerning the 1st embodiment of the present invention, and is a figure showing the state where the slide bearing seismic isolation device is in a neutral position. 図１に示した本発明の第１の実施の形態に係るすべり支承免震装置の断面側面図であり、すべり支承免震装置が作動して中立位置から偏位した状態を示した図である。FIG. 2 is a cross-sectional side view of the sliding bearing isolation device according to the first embodiment of the present invention shown in FIG. 1, showing a state in which the sliding bearing isolation device is operated and deviated from a neutral position. . 本発明の第２の実施の形態に係るすべり支承免震装置の断面側面図であり、すべり支承免震装置が作動して中立位置から偏位した状態を示した図である。It is a cross-sectional side view of the sliding bearing seismic isolation device according to the second embodiment of the present invention, and shows a state where the sliding bearing seismic isolation device is operated and deviated from the neutral position. 本発明の第３の実施の形態に係るすべり支承免震装置の断面側面図であり、すべり支承免震装置が作動して中立位置から偏位した状態を示した図である。It is a cross-sectional side view of the sliding bearing seismic isolation device according to the third embodiment of the present invention, and shows a state where the sliding bearing seismic isolation device is operated and deviated from the neutral position. 本発明の第４の実施の形態に係るすべり支承免震装置の断面側面図であり、すべり支承免震装置が作動して中立位置から偏位した状態を示した図である。It is a cross-sectional side view of the sliding bearing seismic isolation device according to the fourth embodiment of the present invention, and is a diagram showing a state where the sliding bearing seismic isolation device is operated and deviated from the neutral position. 図１に示した本発明の第１の実施の形態に係るすべり支承免震装置を並列して使用した構成を示した断面側面図であり、すべり支承免震装置が中立位置にある状態を示した図である。FIG. 2 is a cross-sectional side view showing a configuration in which the sliding bearing isolation device according to the first embodiment of the present invention shown in FIG. 1 is used in parallel, showing a state in which the sliding bearing isolation device is in a neutral position. It is a figure. 本発明の実施の形態に係る免震構造を備えた構造物を示した模式的側面図である。It is the typical side view showing the structure provided with the seismic isolation structure concerning an embodiment of the invention. 従来例に係る免震構造を備えた構造物を示した模式的側面図である。It is the typical side view which showed the structure provided with the seismic isolation structure which concerns on a prior art example.

図１及び図２に示したのは本発明の第１の実施の形態に係るすべり支承免震装置１０の断面側面図であり、図１はすべり支承免震装置１０が中立位置にある状態を示しており、図２はすべり支承免震装置１０が作動して中立位置から偏位した状態を示している。すべり支承免震装置１０は、構造物の上部構造体１２と下部構造体１４との間に介装されており、上部構造体１２は例えば建物躯体、下部構造体１４は例えばその建物の基礎を成すフーチングなどである。 1 and 2 are cross-sectional side views of the sliding bearing isolation device 10 according to the first embodiment of the present invention, and FIG. 1 shows a state in which the sliding bearing isolation device 10 is in a neutral position. FIG. 2 shows a state in which the sliding bearing seismic isolation device 10 is operated and deviated from the neutral position. The sliding bearing isolation device 10 is interposed between an upper structure 12 and a lower structure 14 of the structure. The upper structure 12 is, for example, a building housing, and the lower structure 14 is, for example, the foundation of the building. Such as footing.

図１に示すように、すべり支承免震装置１０は、いずれも鋼板製の上フランジプレート１６と下フランジプレート１８とを備えている。下フランジプレート１８の上面に、適宜の金属板などで製作されるすべり板２０が固定結合されており、それら下フランジプレート１８及びすべり板２０はアンカーボルト２２によって下部構造体１４の側に固定連結されている。すべり板２０は略々水平に延展しており、その上面がすべり面２４を画成している。ただし、このすべり面２４は平面ではなく、略々部分球面形状を成す凸面形状に形成されている。 As shown in FIG. 1, the sliding bearing seismic isolation device 10 includes an upper flange plate 16 and a lower flange plate 18 made of steel plates. A slide plate 20 made of an appropriate metal plate or the like is fixedly coupled to the upper surface of the lower flange plate 18, and the lower flange plate 18 and the slide plate 20 are fixedly connected to the lower structure 14 side by anchor bolts 22. Has been. The sliding plate 20 extends substantially horizontally, and its upper surface defines a sliding surface 24. However, the sliding surface 24 is not a flat surface, but is formed in a convex shape that is substantially a partial spherical shape.

上フランジプレート１４はアンカーボルト２６によって上部構造体１２の側に固定連結されている。上フランジプレート１４には、ボールジョイント機構２８を介して、円板形状の厚手鋼板から成る支持板３０が揺動可能に連結されている。この支持板３０の下面にすべり材ホルダ３２が固定連結され、このすべり材ホルダ３２によって例えばポリテトラフルオロエチレン樹脂の板材などから成るすべり材３４が固定保持されている。以上の構成により、すべり材３４は上部構造体１２の側に揺動可能に連結されている。 The upper flange plate 14 is fixedly connected to the upper structure 12 side by anchor bolts 26. A support plate 30 made of a disk-shaped thick steel plate is slidably connected to the upper flange plate 14 via a ball joint mechanism 28. A sliding material holder 32 is fixedly connected to the lower surface of the support plate 30, and a sliding material 34 made of, for example, a polytetrafluoroethylene resin plate is fixed and held by the sliding material holder 32. With the above configuration, the sliding member 34 is swingably connected to the upper structure 12 side.

すべり材３４は円板形状であって略々水平に延展しており、その下面がすべり板２０のすべり面２４に摺接する摺接面３６を画成している。この摺接面３６は、略々部分球面形状を成す凹面形状に形成されている。すべり支承免震装置１０の作動時にはすべり材３４がすべり板２０のすべり面２４上を滑動することで、上部構造体１２の下部構造体１４に対する水平方向の相対移動が許容される。 The sliding member 34 has a disc shape and extends substantially horizontally, and its lower surface defines a sliding contact surface 36 that is in sliding contact with the sliding surface 24 of the sliding plate 20. The slidable contact surface 36 is formed in a concave shape having a substantially spherical shape. When the sliding bearing isolation device 10 is operated, the sliding member 34 slides on the sliding surface 24 of the sliding plate 20 so that the relative movement of the upper structure 12 with respect to the lower structure 14 is allowed.

以上の構成によれば、すべり板２０のすべり面２４が略々部分球面形状を成す凸面形状に形成されているため、このすべり支承免震装置１０の作動時には、すべり材３４がすべり板２０に対して相対的に水平方向に偏位して中立位置から離れるにつれてすべり材３４が鉛直下方へ偏位する。そのため、図２に示すように、上部構造体１２の下部構造体１４に対する相対的な水平方向の偏位量δ_Ｈに応じて、すべり支承免震装置１０が沈下量δ_Ｖの沈下を発生し、この水平方向の偏位量δ_Ｈと沈下量δ_Ｖとの関係は、すべり板２０のすべり面２４の曲率半径の大きさを適宜に定めることで、所望の関係とすることができる。それゆえ、積層ゴム免震装置とこのすべり支承免震装置１０とを併用した免震構造を設計する際に、両者の沈下量を揃えることで、即ち、積層ゴム免震装置の作動時の沈下量とこのすべり支承免震装置１０の作動時の沈下量とを実質的に等しくすることで、良好な免震構造が得られる。 According to the above configuration, since the sliding surface 24 of the sliding plate 20 is formed in a convex shape that is substantially a partial spherical shape, the sliding member 34 is attached to the sliding plate 20 during the operation of the sliding support seismic isolation device 10. On the other hand, the sliding member 34 is displaced vertically downward as it deviates relatively in the horizontal direction and moves away from the neutral position. Therefore, as shown in FIG. 2, in accordance with the deviation amount [delta] _H of relative horizontal direction with respect to the lower structure 14 of the upper structure 12, sliding bearings isolator 10 generates a subsidence subsidence [delta] _V the relationship between the horizontal deflection amount [delta] _H and subsidence [delta] _V, by determining the magnitude of the curvature radius of the sliding surface 24 of the sliding plate 20 as appropriate, can be a desired relationship. Therefore, when designing a seismic isolation structure using the laminated rubber seismic isolation device and the sliding bearing seismic isolation device 10 together, by substituting the amount of settlement of both, that is, the settlement during operation of the laminated rubber seismic isolation device A good seismic isolation structure can be obtained by substantially equalizing the amount and the amount of subsidence when the sliding bearing seismic isolation device 10 is operated.

尚、すべり材３４がすべり板２０に対して相対的に水平方向に偏位して中立位置から離れるにつれてすべり材３４は次第に水平方向から傾斜して行く。この水平方向の偏位に伴うすべり材３４の傾動を吸収するために、すべり材３４を上部構造体１２の側に揺動可能に連結してあり、この揺動可能な連結のための手段として、第１の実施の形態に係るすべり支承免震装置１０では、支持板３０と上部構造体１２とをボールジョイント機構２８を介して連結している。 Note that as the sliding member 34 is displaced in the horizontal direction relative to the sliding plate 20 and moves away from the neutral position, the sliding member 34 gradually inclines from the horizontal direction. In order to absorb the tilting of the sliding member 34 due to the horizontal displacement, the sliding member 34 is swingably connected to the upper structure 12 side, and means for this swingable connection is provided. In the sliding bearing seismic isolation device 10 according to the first embodiment, the support plate 30 and the upper structure 12 are connected via the ball joint mechanism 28.

次に、図３及び図４を参照して、本発明の第２の実施の形態に係るすべり支承免震装置４０及び第３の実施の形態に係るすべり支承免震装置５０について説明する。尚、第１の実施の形態に係るすべり支承免震装置１０と同一構成の部分については同一の参照番号を付して説明を省略する。 Next, with reference to FIG.3 and FIG.4, the sliding bearing seismic isolation apparatus 40 which concerns on the 2nd Embodiment of this invention and the sliding bearing seismic isolation apparatus 50 which concerns on 3rd Embodiment are demonstrated. In addition, the same reference number is attached | subjected about the part of the same structure as the sliding bearing seismic isolation apparatus 10 which concerns on 1st Embodiment, and description is abbreviate | omitted.

図３に示した第２の実施の形態に係るすべり支承免震装置４０では、すべり材３４を上部構造体１２の側に揺動可能に連結するための手段として、上フランジプレート１６に固設したリング部材４２の内壁面と、上フランジプレート１６の下面と、支持板３０の上面とで画成される円筒形空間に、その円筒空間合わせた寸法及び形状に形成した円筒形のエラストマーブロック４４を収容してあり、このエラストマーブロック４４の弾性変形によってすべり材３４の傾動を吸収するようにしたものである。その他の部分は第１の実施の形態と同一構成であり、作用効果も同様である。 In the sliding bearing isolator 40 according to the second embodiment shown in FIG. 3, the sliding member 34 is fixed to the upper flange plate 16 as a means for slidably connecting the sliding member 34 to the upper structure 12 side. A cylindrical elastomer block 44 formed in a cylindrical space defined by the inner wall surface of the ring member 42, the lower surface of the upper flange plate 16, and the upper surface of the support plate 30. And the tilt of the sliding member 34 is absorbed by the elastic deformation of the elastomer block 44. The other parts are the same as those in the first embodiment, and the operational effects are also the same.

図４に示した第２の実施の形態に係るすべり支承免震装置５０では、すべり材３４を上部構造体１２の側に揺動可能に連結するための手段として、積層ゴム５２を介して上フランジプレート１６とすべり材ホルダ３２とを連結し、この積層ゴム５２の弾性変形によってすべり材３４の傾動を吸収するようにしたものである。その他の部分は第１の実施の形態と同一構成であり、作用効果も同様である。 In the sliding bearing seismic isolation device 50 according to the second embodiment shown in FIG. 4, as a means for slidably connecting the sliding member 34 to the upper structure 12 side, the upper part is interposed via a laminated rubber 52. The flange plate 16 and the sliding material holder 32 are connected, and the tilting of the sliding material 34 is absorbed by the elastic deformation of the laminated rubber 52. The other parts are the same as those in the first embodiment, and the operational effects are also the same.

次に、図５を参照して、本発明の第４の実施の形態に係るすべり支承免震装置６０について説明する。すべり支承免震装置６０は構造物の上部構造体１２と下部構造体１４との間に介装されており、上部構造体１２は例えば建物躯体、下部構造体１４は例えばその建物の基礎を成すフーチングなどである。 Next, a sliding bearing seismic isolation device 60 according to a fourth embodiment of the present invention will be described with reference to FIG. The sliding bearing isolation device 60 is interposed between the upper structure 12 and the lower structure 14 of the structure. The upper structure 12 is, for example, a building housing, and the lower structure 14 is, for example, the foundation of the building. Such as footing.

すべり支承免震装置６０は、いずれも鋼板製の上フランジプレート６２と下フランジプレート６４とを備えている。上フランジプレート６２の下面と、下フランジプレート６４の上面とに、適宜の金属板などで製作される上すべり板６６と、下すべり板６８とが固定結合されており、上フランジプレート６２及び上すべり板６６は上部構造体１２の側に、また、下フランジプレート６４及び下すべり板６８は下部構造体１４の側に、夫々不図示のアンカーボルトによって固定連結されている。上下のすべり板６６、６８は、いずれも略々水平に延展しており、上すべり板６６の下面と、下すべり板６８の上面とは、夫々にすべり面７０とすべり面７２とを画成している。ただし、それらすべり面７０、７２は平面ではなく、第１の実施の形態に係るすべり支承免震装置１０のすべり面２４と同様に、略々部分球面形状を成す凸面形状に形成されており、また、それら２つのすべり面７０、７２は互いに同一の寸法形状とされている。 The sliding bearing seismic isolation device 60 includes an upper flange plate 62 and a lower flange plate 64 made of steel plates. An upper sliding plate 66 and a lower sliding plate 68 made of an appropriate metal plate or the like are fixedly coupled to the lower surface of the upper flange plate 62 and the upper surface of the lower flange plate 64. The sliding plate 66 is fixedly connected to the upper structure 12 side, and the lower flange plate 64 and the lower sliding plate 68 are fixedly connected to the lower structure 14 side by anchor bolts (not shown). The upper and lower sliding plates 66 and 68 extend substantially horizontally, and the lower surface of the upper sliding plate 66 and the upper surface of the lower sliding plate 68 define a sliding surface 70 and a sliding surface 72, respectively. doing. However, these sliding surfaces 70 and 72 are not flat surfaces, but are formed in a convex surface shape that is substantially partially spherical, similar to the sliding surface 24 of the sliding bearing seismic isolation device 10 according to the first embodiment, The two sliding surfaces 70 and 72 have the same size and shape.

上下のすべり板６６、６８の間に例えばポリテトラフルオロエチレン樹脂などから成るすべり材７４が挟持されている。すべり材７４は円板形状であって略々水平に延展しており、その上面が上すべり板６６のすべり面７０に摺接する上摺接面７６を画成し、その下面が下すべり板６８のすべり面７０に摺接する下摺接面７８を画成している。それら摺接面７６、７８は、略々部分球面形状を成す凹面形状に形成されている。すべり支承免震装置６０の作動時にはすべり材７４が上下のすべり板６６、６８のすべり面７０、７２上を滑動することで、上部構造体１２の下部構造体１４に対する水平方向の相対移動が許容される。 A sliding material 74 made of, for example, polytetrafluoroethylene resin is sandwiched between the upper and lower sliding plates 66 and 68. The sliding member 74 has a disc shape and extends substantially horizontally. The upper surface of the sliding member 74 defines an upper sliding contact surface 76 that is in sliding contact with the sliding surface 70 of the upper sliding plate 66, and the lower surface thereof is the lower sliding plate 68. A lower sliding contact surface 78 that is in sliding contact with the sliding surface 70 is defined. These slidable contact surfaces 76 and 78 are formed in a concave surface having a substantially spherical shape. When the sliding bearing isolation device 60 is operated, the sliding member 74 slides on the sliding surfaces 70 and 72 of the upper and lower sliding plates 66 and 68, thereby allowing the horizontal movement of the upper structure 12 relative to the lower structure 14 to be permitted. Is done.

以上の構成によれば、上下のすべり板６６、６８のすべり面７０、７２が略々部分球面形状を成す凸面形状に形成されているため、このすべり支承免震装置６０の作動時には、すべり材７４が上下のすべり板６６、６８に対して相対的に水平方向に偏位して中立位置から離れるにつれてすべり材７４が鉛直下方へ偏位し、また更に大きな偏位量をもって上すべり板６６が鉛直下方へ偏位する。そのため、上部構造体１２の下部構造体１４に対する相対的な水平方向の偏位量に応じて、すべり支承免震装置６０が沈下を発生し、この水平方向の偏位量と沈下量との関係は、上下のすべり板６６、６８のすべり面７０、７２の曲率半径の大きさを適宜に定めることで、所望の関係とすることができる。それゆえ、積層ゴム免震装置とこのすべり支承免震装置６０とを併用した免震構造を設計する際に、両者の沈下量を揃えることで、即ち、積層ゴム免震装置の作動時の沈下量とこのすべり支承免震装置７０の作動時の沈下量とを実質的に等しくすることで、良好な免震構造が得られる。 According to the above configuration, since the sliding surfaces 70 and 72 of the upper and lower sliding plates 66 and 68 are formed in a convex surface shape having a substantially partial spherical shape, when the sliding bearing isolation device 60 is operated, the sliding material is used. As 74 deviates in the horizontal direction relative to the upper and lower sliding plates 66 and 68 and moves away from the neutral position, the sliding member 74 deviates vertically downward, and the upper sliding plate 66 has a larger displacement amount. It deviates vertically downward. Therefore, depending on the amount of horizontal displacement relative to the lower structure 14 of the upper structure 12, the sliding support seismic isolation device 60 is sunk, and the relationship between this amount of horizontal displacement and the amount of sag. The desired relationship can be established by appropriately determining the size of the radius of curvature of the sliding surfaces 70 and 72 of the upper and lower sliding plates 66 and 68. Therefore, when designing a seismic isolation structure that uses the laminated rubber seismic isolation device and the sliding bearing seismic isolation device 60 together, by substituting the amount of settlement of both, that is, the settlement during operation of the laminated rubber seismic isolation device A good seismic isolation structure can be obtained by making the amount and the amount of subsidence when the sliding bearing seismic isolation device 70 operates substantially equal.

尚、すべり材７４が上下のすべり板２０に対して相対的に水平方向に偏位して中立位置から離れるにつれてすべり材７４は次第に水平方向から傾斜して行くが、すべり材７４を挟持している上下のすべり面７０、７２が互いに同一の寸法形状であるため、その傾斜によって、すべり材７４の上下の摺接面７６、７８とそれらすべり面７０、７２との当接状態が損なわれることはない。 In addition, as the sliding member 74 is displaced in the horizontal direction relative to the upper and lower sliding plates 20 and moves away from the neutral position, the sliding member 74 gradually inclines from the horizontal direction. Since the upper and lower sliding surfaces 70 and 72 having the same size and shape are in contact with each other, the contact state between the upper and lower sliding contact surfaces 76 and 78 of the sliding member 74 and the sliding surfaces 70 and 72 is impaired by the inclination. There is no.

以上に説明した第１〜第４の実施の形態に係るすべり支承免震装置はいずれも、免震構造の１つの支持箇所において支持する鉛直荷重が大きい場合には、複数のすべり支承免震装置を１つの支持箇所に配列して使用するとよい。そのようにした場合の具体例を示したのが図６であり、この具体例は、図１に示した第１の実施の形態に係るすべり支承免震装置１０を２基並列したものである。 Any of the sliding bearing isolation devices according to the first to fourth embodiments described above has a plurality of sliding bearing isolation devices when a large vertical load is supported at one support location of the isolation structure. May be used in a single support location. FIG. 6 shows a specific example in such a case, and this specific example is one in which two sliding bearing isolation devices 10 according to the first embodiment shown in FIG. 1 are arranged in parallel. .

次に、図７を参照して、本発明の実施の形態に係る免震構造８０について説明する。同図に示したのは、この免震構造８０を備えた構造物の模式的側面図である。構造物は上部構造体１２と下部構造体１４とに分割して構築されており、上部構造体１２は例えば建物躯体、下部構造体１４は例えばその建物の基礎を成すフーチングなどである。構造物の上部構造体１２と下部構造体１４との間の複数の支持箇所の各々に免震装置８２、８４を介装し、そら免震装置８２、８４によって上部構造体１２を支持している。複数の支持箇所のうちの幾つかの支持箇所では積層ゴム免震装置８２を使用し、その他の支持箇所では、上で説明した実施の形態の如き、本発明に係るすべり支承免震装置８４を使用しており、これによって、積層ゴム免震装置とすべり支承免震装置とを併用した免震構造が構成されている。そして、積層ゴム免震装置８２の作動時の沈下量と、すべり支承免震装置８４の作動時の沈下量とが実質的に等しくなるように、それら免震装置８２、８４を設計してあり、それによって、地震発生時の各免震装置８２、８４の支持箇所における鉛直変位差を解消ないし抑制し、各免震装置８２、８４に支持された上部構造の梁に生じる応力およびスパン間の変位角を緩和することができる。またかかる免震構造において、その１つの支持箇所において支持する鉛直荷重が大きい場合には、例えば図６に示したように、本発明に係るすべり支承免震装置を複数並列するとよい。 Next, with reference to FIG. 7, the seismic isolation structure 80 which concerns on embodiment of this invention is demonstrated. The figure shows a schematic side view of a structure provided with the seismic isolation structure 80. The structure is constructed by being divided into an upper structure 12 and a lower structure 14, and the upper structure 12 is, for example, a building housing, and the lower structure 14 is, for example, a footing that forms the foundation of the building. Seismic isolation devices 82, 84 are interposed at each of a plurality of support points between the upper structure 12 and the lower structure 14 of the structure, and the upper structure 12 is supported by the seismic isolation devices 82, 84. Yes. The laminated rubber seismic isolation device 82 is used in some of the plurality of supporting locations, and the sliding support seismic isolation device 84 according to the present invention is used in the other supporting locations as in the embodiment described above. In this way, a seismic isolation structure using a laminated rubber seismic isolation device and a sliding bearing seismic isolation device is constructed. The seismic isolation devices 82 and 84 are designed so that the amount of settlement during operation of the laminated rubber seismic isolation device 82 is substantially equal to the amount of settlement during operation of the sliding bearing isolation device 84. This eliminates or suppresses the vertical displacement difference at the place where the seismic isolation devices 82 and 84 are supported in the event of an earthquake, and the stress and span generated in the superstructure beams supported by the seismic isolation devices 82 and 84 are reduced. The displacement angle can be relaxed. Further, in such a seismic isolation structure, when the vertical load to be supported at one of the supporting points is large, for example, as shown in FIG. 6, a plurality of sliding bearing seismic isolation devices according to the present invention may be arranged in parallel.

１０すべり支承免震装置
１２上部構造体
１４下部構造体
１６上フランジプレート
１８下フランジプレート
２０すべり板
２４すべり面
２８ボールジョイント機構
３４すべり材
４０すべり支承免震装置
４２リング部材
４４エラストマーブロック
５０すべり支承免震装置
５２積層ゴム
６０すべり支承免震装置
６２上フランジプレート
６４下フランジプレート
６６上すべり板
６８下すべり板
７０すべり面
７２すべり面
７４すべり材
８０すべり支承免震装置
８２積層ゴム免震装置
８４すべり支承免震装置 DESCRIPTION OF SYMBOLS 10 Sliding bearing seismic isolation device 12 Upper structure 14 Lower structure 16 Upper flange plate 18 Lower flange plate 20 Sliding plate 24 Sliding surface 28 Ball joint mechanism 34 Sliding material 40 Sliding bearing seismic isolator 42 Ring member 44 Elastomer block 50 Sliding bearing Seismic isolation device 52 Laminated rubber 60 Sliding bearing seismic isolation device 62 Upper flange plate 64 Lower flange plate 66 Upper slip plate 68 Lower slip plate 70 Slip surface 72 Slip surface 74 Slip material 80 Slip bearing seismic isolation device 82 Laminated rubber seismic isolation device 84 Sliding bearing isolation device

Claims

A seismic isolation structure for a structure in which a seismic isolation device is interposed at each of a plurality of support locations between the upper structure and the lower structure of the structure, and the upper structure is supported by the seismic isolation device. In
By using a laminated rubber seismic isolation device at some of the plurality of supporting locations and using a sliding bearing isolation device at the other supporting locations, a laminated rubber isolation device and a sliding bearing isolation device are used. Together with
The sliding bearing isolation device includes a sliding plate connected to the lower structure side and extending substantially horizontally, and a sliding material connected to the upper structure side,
The sliding plate has an upper surface that defines a sliding surface, the sliding material has a lower surface that defines a sliding contact surface that is in sliding contact with the sliding surface, and the sliding material is the sliding surface of the sliding plate. The upper structure is allowed to move horizontally relative to the lower structure by sliding on the upper structure,
The sliding surface of the sliding plate is formed in a convex surface shape having a substantially partial spherical shape, whereby the sliding member is displaced in the horizontal direction relative to the sliding plate and is separated from the neutral position. Citea as the skids are deviating vertically downward brought to is,
The amount of settlement during operation of the laminated rubber seismic isolation device is substantially equal to the amount of settlement during operation of the sliding bearing seismic isolation device,
Seismic isolation structure for structures.

2. The seismic isolation structure for a structure according to claim 1, wherein the sliding member is swingably connected to the upper structure side.

3. The seismic isolation structure for a structure according to claim 2, wherein the sliding member is swingably connected to the upper structure side through a ball joint mechanism.

3. The seismic isolation structure for a structure according to claim 2, wherein the sliding member is swingably connected to the upper structure side through an elastomer block.

3. The seismic isolation structure for a structure according to claim 2, wherein the sliding member is connected to the upper structure side through a laminated rubber so as to be swingable.

A seismic isolation structure for a structure in which a seismic isolation device is interposed at each of a plurality of support locations between the upper structure and the lower structure of the structure, and the upper structure is supported by the seismic isolation device. In
By using a laminated rubber seismic isolation device at some of the plurality of supporting locations and using a sliding bearing isolation device at the other supporting locations, a laminated rubber isolation device and a sliding bearing isolation device are used. Together with
The sliding bearing seismic isolation device includes a first sliding plate connected to the lower structure side and extending substantially horizontally, and a second sliding plate connected to the upper structure side and extending substantially horizontally. And a sliding material disposed between the first sliding plate and the second sliding plate,
The upper surface of the first sliding plate defines a first sliding surface, and the lower surface of the second sliding plate defines a second sliding surface,
The sliding material has a lower surface that defines a first sliding surface that is in sliding contact with the first sliding surface, and an upper surface that defines a second sliding surface that is in sliding contact with the second sliding surface,
The sliding member slides on the first and second sliding surfaces of the first and second sliding plates so that the relative movement of the upper structure relative to the lower structure is allowed. ,
The first and second sliding surfaces of the first and second sliding plates are formed in a convex shape having a substantially partial spherical shape, so that the second sliding plate is located with respect to the first sliding plate. relatively Ri Citea so deviates to the second sliding member is vertically downward as horizontally away from the neutral position to displaced,
The amount of settlement during operation of the laminated rubber seismic isolation device is substantially equal to the amount of settlement during operation of the sliding bearing seismic isolation device,
Seismic isolation structure for structures.

The seismic isolation structure for a structure according to any one of claims 1 to 6 , wherein a plurality of the slide bearing seismic isolation devices are juxtaposed in at least one of the plurality of support locations.