JP5667476B2 - Base-isolated buildings and methods for building base-isolated buildings - Google Patents

Base-isolated buildings and methods for building base-isolated buildings Download PDF

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JP5667476B2
JP5667476B2 JP2011051288A JP2011051288A JP5667476B2 JP 5667476 B2 JP5667476 B2 JP 5667476B2 JP 2011051288 A JP2011051288 A JP 2011051288A JP 2011051288 A JP2011051288 A JP 2011051288A JP 5667476 B2 JP5667476 B2 JP 5667476B2
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seismic isolation
building
foundation
isolation device
base
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JP2012188817A (en
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泰弘 西川
泰弘 西川
慶一郎 井上
慶一郎 井上
金田　和浩
和浩 金田
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Taisei Corp
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Description

本発明は、免震建物および免震建物の構築方法に関する。   The present invention relates to a base-isolated building and a method for constructing a base-isolated building.

地震の揺れを上部構造に直接伝えない建物として、基礎と上部構造を切り離した免震建物が知られている。
免震建物では、一般的に、基礎と上部構造の柱下端との間に、積層ゴム支承やすべり支承等の免震装置を介設することで入力加速度を制限し、地震時の水平力を低減させるとともに、上部構造の固有周期を長周期化している（例えば特許文献１参照）。 Seismic isolation buildings that separate the foundation and the superstructure are known as buildings that do not directly transmit the shaking of the earthquake to the superstructure.
In seismic isolation buildings, generally, the input acceleration is limited by installing a seismic isolation device such as a laminated rubber bearing or a sliding bearing between the foundation and the lower end of the superstructure column, thereby reducing the horizontal force during an earthquake. In addition to the reduction, the natural period of the upper structure is lengthened (for example, see Patent Document 1).

このような免震建物は、免震装置上の上部構造を水平変位可能に支持するように構成されているとともに、基礎の剛性を高めて免震装置に変形を集中させることで、必要な減衰効果や固有周期の制御を行っている。
また、水平方向の変位を許容しつつ、上下方向の変位を制御することで、転倒を防止している。 Such seismic isolation buildings are configured to support the upper structure on the seismic isolation device so that it can be displaced horizontally, and by increasing the rigidity of the foundation and concentrating deformation on the seismic isolation device, the necessary damping is achieved. The effect and natural period are controlled.
Further, by allowing the displacement in the horizontal direction to be controlled while controlling the displacement in the vertical direction, the fall is prevented.

特開平１１−２９３９４５号公報Japanese Patent Laid-Open No. 11-293945

建物の高さと幅との比を表すアスペクト比（高さ／幅）が大きい建物の場合は、地震時に建物全体が回転して端部の上下動が大きくなるロッキング振動や転倒モーメントの影響により、免震装置に大きな引張力が作用する。   In the case of a building with a large aspect ratio (height / width) that represents the ratio between the height and width of the building, due to the influence of rocking vibration and tipping moment that the whole building rotates and the vertical movement of the end increases during an earthquake, A large tensile force acts on the seismic isolation device.

そのため、アスペクト比の大きい建物の場合は、免震装置に引張力を負担するための部材を設けたり、浮き上がりを拘束するローラーを配置したり、転倒防止用積層ゴム体を設置するなど、引張力に対する補強構造を構築する必要があり、この補強構造がコスト低減化の妨げとなっていた。
また、建物本体の柱や基礎にも同様な引張軸力が作用するため、柱や基礎についても、この引張軸力に応じた高耐力構造にする必要がある。 Therefore, in the case of buildings with a large aspect ratio, a tensile force can be provided, such as installing a member to bear the tensile force on the seismic isolation device, placing a roller that restrains lifting, or installing a laminated rubber body to prevent falling. Therefore, it is necessary to construct a reinforcing structure against the above, and this reinforcing structure hinders cost reduction.
Moreover, since the same tensile axial force acts also on the pillar and foundation of a building main body, it is necessary also about a pillar and a foundation also to make it the high strength structure according to this tensile axial force.

一方、杭頭部で免震装置をピン支承して基礎梁を省略したり、平面視で出隅部に位置する柱の直下の基礎を省略したりして基礎の剛性を落とすことで伝達される地震時の水平力を低減させようとする場合があるが、このようにすると、基礎自体の変形が大きくなるおそれがあった。   On the other hand, it is transmitted by pinning the seismic isolation device at the pile head and omitting the foundation beam, or omitting the foundation directly below the column located in the projected corner in plan view and reducing the rigidity of the foundation. In some cases, the horizontal force at the time of an earthquake may be reduced. However, in this case, the deformation of the foundation itself may be increased.

さらに、特許文献１では、四隅に位置する柱の隣の柱の下端部を省略し、軸力を四隅に集中させることで、この位置に配設された免震装置に作用する集中荷重により、地震時の引張力を打ち消す構成が開示されているが、上部構造が複雑となり、その設計や施工に手間がかかるとともにコストが高くなるおそれがあった。   Furthermore, in patent document 1, the lower end part of the column adjacent to the column located at the four corners is omitted, and the concentrated force acting on the seismic isolation device disposed at this position by concentrating the axial force at the four corners, Although the structure which cancels the tensile force at the time of an earthquake is disclosed, the superstructure is complicated, and there is a possibility that the design and construction will be troublesome and the cost may be increased.

本発明は、前記の問題点を解決することを目的とするものであり、免震効果を低下させることなく、低コストで構築することが可能となる免震建物および免震建物の構築方法を提案することを課題とする。   The present invention aims to solve the above-mentioned problems, and provides a seismic isolation building and a method for constructing a seismic isolation building that can be constructed at low cost without reducing the seismic isolation effect. The challenge is to propose.

このような課題を解決するために本発明の免震建物は、地震時入力を低減する免震層が所定の階層に設けられていて、地震時に建物全体が回転して建物端部が上下に動いてロッキング振動する免震建物であって、前記免震層では、当該免震層の直上階の平面の少なくとも四つの隅部に位置する柱の下方に免震装置を設けず、当該柱の浮き上がりや沈み込みを許容することが可能な絶縁空間が設けられているとともに、それ以外の柱の下方には免震装置が設置されていることを特徴としている。 Seismic isolation building of the present invention to solve such problems, seismic isolation layer to reduce the seismic input is provided to a predetermined hierarchy, building end rotates the entire building during an earthquake is vertically It is a seismic isolation building that moves and rocks, and in the seismic isolation layer, a seismic isolation device is not provided below the column located in at least four corners of the plane immediately above the seismic isolation layer . It is characterized by an insulating space capable of allowing ups and downs and a seismic isolation device installed below the other pillars.

また、本発明の免震建物の構築方法は、平面の少なくとも四つの隅部に立設される柱の位置に対応して仮設支保部材を配置するとともに、それ以外の柱の位置に対応して免震装置を配置して免震層を形成する工程と、前記仮設支保部材および前記免震装置により柱を支持した状態で前記免震層より上の躯体の施工を行う工程と、前記躯体の施工が所定の高さまで進んだ後に前記仮設支保部材を撤去して、前記隅部に立設された柱の下方に免震装置を設けず、当該柱の浮き上がりや沈み込みを許容することが可能な絶縁空間を設ける工程と、を備えることを特徴としている。 Moreover, the construction method of the seismic isolation building of the present invention arranges the temporary support members corresponding to the positions of the pillars erected at at least four corners of the plane, and corresponds to the positions of the other pillars. A step of forming a base isolation layer by arranging a base isolation device; a step of constructing a casing above the base isolation layer in a state where a column is supported by the temporary support member and the base isolation device; and It is possible to remove the temporary support member after the construction has progressed to a predetermined height, and to allow the column to be lifted or submerged without providing a seismic isolation device below the column erected at the corner. Providing an insulating space.

かかる免震建物および免震建物の構築方法によれば、建物本体の少なくとも四つの隅部（出隅）の柱の下における免震装置を省略し、隣に位置する免震装置が負担する軸力を大きくすることで免震装置に大きな引張力が作用するのを防止するとともに、コストの低減化を図ることができる。
つまり、隅部では大きな地震力が作用した場合に、浮き上がりや沈み込みを許容し、ロッキング振動に伴なう引張軸力を負担しない構造とすることで、免震効果を低下させることなく、引張軸力に対する補強構造や高耐力構造を省略することを可能としている。 According to such a base-isolated building and the method for constructing the base-isolated building, the base-isolated device under the pillars in at least four corners (outside corners) of the building body is omitted, and the axis that the adjacent base-isolated device bears By increasing the force, it is possible to prevent a large tensile force from acting on the seismic isolation device and to reduce the cost.
In other words, when a large seismic force is applied at the corners, the structure can be lifted and subducted, and does not bear the tensile axial force associated with rocking vibration. It is possible to omit the reinforcing structure against the axial force and the high strength structure.

また、建物本体の隅部の鉛直荷重は小さいため、その隣に位置する柱の下に配設された免震装置を介して基礎に伝達することで、建物の安定性を維持することができる。   In addition, since the vertical load at the corner of the building body is small, the building stability can be maintained by transmitting it to the foundation via the seismic isolation device arranged under the column located next to it. .

本発明の免震建物および免震建物の構築方法によれば、ロッキング振動が支配的となることが予想される場合であっても、免震効果を低下させることなく、低コストで構築することができる。   According to the base-isolated building and the construction method of the base-isolated building of the present invention, it is possible to construct the base-isolated building at a low cost without reducing the base-isolating effect even when the rocking vibration is expected to be dominant. Can do.

本発明の実施の形態に係る免震建物の概要を示す立面図である。It is an elevation view which shows the outline | summary of the seismic isolation building which concerns on embodiment of this invention. 図１に示す免震建物の免震層を示す平面図である。It is a top view which shows the seismic isolation layer of the base isolation building shown in FIG. （ａ）〜（ｃ）は免震建物の構築方法の各施工段階を示す断面図である。(A)-(c) is sectional drawing which shows each construction step of the construction method of a seismic isolation building. （ａ）および（ｂ）は免震建物の他の例を示す平面図である。(A) And (b) is a top view which shows the other example of a seismic isolation building.

本実施形態では、図１に示すように、多層階構造の建物本体１０と、建物本体１０の下方に設けられた基礎２０と、建物本体１０と基礎２０との間に設けられた免震層３０と、を備える免震建物１について説明する。
なお、免震建物１の規模や形状等は限定されるものではない。また、免震層３０の位置は建物本体１０と基礎２０との間に限定されるものではない。免震建物１は、地下構造を備える建物であってもよい。 In the present embodiment, as shown in FIG. 1, a multi-story building body 10, a foundation 20 provided below the building body 10, and a seismic isolation layer provided between the building body 10 and the foundation 20. The base-isolated building 1 provided with 30 will be described.
In addition, the magnitude | size, shape, etc. of the seismic isolation building 1 are not limited. Further, the position of the seismic isolation layer 30 is not limited between the building body 10 and the foundation 20. The base-isolated building 1 may be a building having an underground structure.

建物本体１０は、複数の柱１１，１１，…と、柱１１同士の間に横架された梁１２，１３とを備えている。   The building body 10 includes a plurality of pillars 11, 11,..., And beams 12, 13 laid horizontally between the pillars 11.

梁１２は、建物本体１０の各階層に設けられていて、建物本体１０の下端には、柱１１同士の下端部をつなぐ、下端梁１３が設けられている。
本実施形態では、下端梁１３を地表面よりも掘り下げた位置に形成しているが、下端梁１３の位置は限定されるものではない。 The beam 12 is provided at each level of the building body 10, and a lower end beam 13 that connects the lower ends of the columns 11 is provided at the lower end of the building body 10.
In the present embodiment, the lower end beam 13 is formed at a position dug down from the ground surface, but the position of the lower end beam 13 is not limited.

建物本体１０は、平面視矩形状を呈している。なお、建物本体１０の形状は限定されるものではない。また、建物本体１０の階層数も限定されるものではない。   The building body 10 has a rectangular shape in plan view. In addition, the shape of the building main body 10 is not limited. Further, the number of floors of the building body 10 is not limited.

基礎２０は、図１に示すように、建物本体１０の下の地盤Ｇ内に形成されており、下端梁１３との間に隙間を有して形成されている。
基礎２０は、基礎スラブ２１と基礎杭２２とを備えている。基礎２０の構成は、限定されるものではなく、例えば、基礎スラブ２１に代えて基礎梁を採用してもよいし、独立基礎を採用してもよい。 As shown in FIG. 1, the foundation 20 is formed in the ground G under the building main body 10, and is formed with a gap between the lower end beam 13.
The foundation 20 includes a foundation slab 21 and a foundation pile 22. The configuration of the foundation 20 is not limited. For example, a foundation beam may be employed instead of the foundation slab 21 or an independent foundation may be employed.

基礎スラブ２１は、下端梁１３の下方に形成された版状部材であって、直下に形成された基礎杭２２の頭部が固定されている。
本実施形態では、地表面を掘り下げた位置に基礎スラブ２１を形成している。 The foundation slab 21 is a plate-like member formed below the lower end beam 13, and the head of the foundation pile 22 formed immediately below is fixed.
In this embodiment, the foundation slab 21 is formed at a position where the ground surface is dug down.

本実施形態では、図２に示すように、基礎スラブ２１が平面視矩形状に形成されている。なお、基礎スラブ２１の形状は矩形状に限定されるものではなく、適宜形成すればよい。また、基礎スラブ２１の厚み（高さ）は、免震建物１の規模に応じて適宜設定すればよい。   In the present embodiment, as shown in FIG. 2, the basic slab 21 is formed in a rectangular shape in plan view. The shape of the foundation slab 21 is not limited to a rectangular shape, and may be formed as appropriate. Moreover, what is necessary is just to set the thickness (height) of the foundation slab 21 suitably according to the scale of the seismic isolation building 1.

基礎杭２２は、図１に示すように、柱１１の位置に対応して形成されており、柱１１の中心軸の延長線上に形成されている。
なお、柱１１と基礎杭２２との位置関係は、これに限定されるものではなく、適宜設定すればよい。また、基礎杭２２は、先端が支持層に到達させた支持杭であってもよいし、周面摩擦力により支持する摩擦杭であってもよく、基礎杭２２の支持形式は限定されるものではない。 As shown in FIG. 1, the foundation pile 22 is formed corresponding to the position of the column 11, and is formed on an extension line of the central axis of the column 11.
In addition, the positional relationship between the pillar 11 and the foundation pile 22 is not limited to this, and may be set as appropriate. The foundation pile 22 may be a support pile whose tip reaches the support layer, or may be a friction pile supported by a peripheral frictional force, and the support type of the foundation pile 22 is limited. is not.

免震層３０は、地震時入力を低減するように、所定の階層（本実施形態では建物本体１０と基礎２０との間）に形成された隙間に配設された免震装置３１を備えて構成されている。   The seismic isolation layer 30 includes a seismic isolation device 31 disposed in a gap formed at a predetermined level (between the building body 10 and the foundation 20 in the present embodiment) so as to reduce input during an earthquake. It is configured.

免震装置３１は、柱１１および基礎杭２２の軸線上において、柱１１（下端梁１３）と基礎スラブ２１との間に介設されている。   The seismic isolation device 31 is interposed between the column 11 (lower end beam 13) and the foundation slab 21 on the axis of the column 11 and the foundation pile 22.

図１および図２に示すように、建物本体１０（基礎スラブ２１）の平面の四隅である隅部（出隅）Ｃに位置する柱１１の軸線上には、免震装置３１は介設されておらず、下端梁１３と基礎スラブ２１との間には絶縁空間が設けられている。すなわち、隅部Ｃにおいては、建物本体１０と基礎２０との間で力のやり取りが行われない。一方、絶縁空間が形成された隅部Ｃ以外の柱１１と基礎スラブ２１との間には、免震装置３１が介設されている。   As shown in FIGS. 1 and 2, a seismic isolation device 31 is interposed on the axis of the column 11 located at the corners (protruding corners) C which are the four corners of the plane of the building body 10 (the foundation slab 21). However, an insulating space is provided between the lower end beam 13 and the foundation slab 21. That is, in the corner portion C, no force is exchanged between the building body 10 and the foundation 20. On the other hand, a seismic isolation device 31 is interposed between the pillar 11 other than the corner C where the insulating space is formed and the foundation slab 21.

免震装置３１の構成は限定されるものではないが、本実施形態では積層ゴム支承を採用する。また、本実施形態では、隅部Ｃと隣り合う位置に配置された免震装置３１には、鉛プラグ入り積層ゴム支承、高減衰ゴム支承、または、弾性すべり支承等を備えた免震装置３１ａを配設している。なお、隅部Ｃの隣に位置する免震装置３１の構成は、当該免震装置３１の構成は負担する鉛直荷重に応じて適宜設定すればよく、他の位置に配置された免震装置と同じものであってもよい。   Although the structure of the seismic isolation device 31 is not limited, a laminated rubber bearing is employed in this embodiment. Further, in the present embodiment, the seismic isolation device 31 disposed at a position adjacent to the corner C has a seismic isolation device 31a provided with a laminated rubber bearing with a lead plug, a high damping rubber bearing, or an elastic sliding bearing. Is arranged. In addition, what is necessary is just to set the structure of the seismic isolation apparatus 31 located next to the corner C suitably according to the vertical load which the structure of the said seismic isolation apparatus bears, and with the seismic isolation apparatus arrange | positioned in another position It may be the same.

本実施形態の免震建物の構築方法は、第一躯体構築工程と、免震層形成工程と、第二躯体構築工程と、支保部材撤去工程と、第三躯体構築工程とを備えている。   The construction method of the base-isolated building of this embodiment is equipped with the 1st housing construction process, the seismic isolation layer formation process, the 2nd housing construction process, the support member removal process, and the 3rd housing construction process.

第一躯構築工程は、図３（ａ）に示すように、免震層３０よりも下の躯体を構築する工程である。
本実施形態では、免震層３０よりも下の躯体として、地盤Ｇ内に基礎２０を構築する。なお、免震層３０よりも下の躯体は、基礎２０に限定されるものではなく、例えば、地下構造や低層階の躯体等であってもよい。 As shown in FIG. 3A, the first fence construction process is a process of constructing a chassis below the seismic isolation layer 30.
In this embodiment, the foundation 20 is constructed in the ground G as a frame below the seismic isolation layer 30. The housing below the seismic isolation layer 30 is not limited to the foundation 20 and may be, for example, an underground structure or a lower-floor housing.

まず、地盤を掘り下げて、基礎杭２２，２２，…を所定の位置に形成する。次に、基礎杭２２，２２，…の頭部を巻き込んだ状態で基礎スラブ２１を形成する。   First, the ground is dug down and the foundation piles 22, 22,... Are formed at predetermined positions. Next, the foundation slab 21 is formed in a state where the heads of the foundation piles 22, 22,.

免震層形成工程は、図３（ｂ）に示すように、建物本体１０の平面の隅部Ｃに立設される柱１１の位置に対応して仮設支保部材３２，３２，…を配置するとともに、それ以外の柱１１の位置に対応して免震装置３１を配置する工程である。   In the seismic isolation layer forming step, temporary support members 32, 32,... Are arranged corresponding to the positions of the pillars 11 erected at the corner C of the plane of the building body 10, as shown in FIG. And it is the process of arrange | positioning the seismic isolation apparatus 31 corresponding to the position of the pillar 11 other than that.

免震装置３１は、基礎杭２２の中心軸の延長線上に配置する。また、本実施形態では、仮設支保部材３２の配置とともに、仮設支保部材３２の周囲に、ジャッキ（図示省略）を配置しておく。   The seismic isolation device 31 is disposed on an extension line of the central axis of the foundation pile 22. In the present embodiment, a jack (not shown) is arranged around the temporary support member 32 together with the temporary support member 32.

仮設支保部材３２は、建物本体１０の構築時において、建物本体１０の隅部Ｃを支持する。仮設支保部材３２の構成は限定されるものではなく、例えば、形鋼を配設してもよい。   The temporary support member 32 supports the corner C of the building body 10 when the building body 10 is constructed. The configuration of the temporary support member 32 is not limited. For example, a shape steel may be provided.

第二躯体構築工程は、図３（ｃ）に示すように、基礎２０の上方に建物本体１０（躯体）を形成する工程である。つまり、仮設支保部材３２および免震装置３１により柱１１を支持した状態で免震層３０より上の階の躯体（柱１１、梁１２、下端梁１３等）の施工を行う。   The second building construction step is a step of forming the building body 10 (housing) above the foundation 20 as shown in FIG. In other words, the frame (column 11, beam 12, lower end beam 13, etc.) on the floor above the seismic isolation layer 30 is constructed in a state where the column 11 is supported by the temporary support member 32 and the seismic isolation device 31.

柱１１は、免震装置３１や仮設支保部材３２の軸線上（真上）に形成するものとし、各柱１１から伝達される鉛直荷重を、免震装置３１や仮設支保部材３２に支持させる。
梁１２および下端梁１３は、隣り合う柱１１同士をつなぐように形成されている。 The pillar 11 is formed on the axis of the seismic isolation device 31 and the temporary support member 32 (directly above), and the vertical load transmitted from each column 11 is supported by the seismic isolation device 31 and the temporary support member 32.
The beam 12 and the lower end beam 13 are formed so as to connect the adjacent columns 11 to each other.

支保部材撤去工程は、建物本体１０（躯体）の構築が所定の位置まで完成した後、隅部Ｃに配設された仮設支保部材３２を撤去する工程である。
なお、「建物本体１０の構築が所定の位置まで完成した」ときは、例えば、建物本体１０の躯体が所定の高さ（階層）まで完成することで、隅部Ｃに位置する柱１１の鉛直荷重（軸力）を、下端梁１３等を介して隅部Ｃの隣に配設された免震装置３１に伝達することが可能な状態となったときをいう。 The support member removal step is a step of removing the temporary support member 32 disposed in the corner C after the building body 10 (frame) is completely constructed to a predetermined position.
In addition, when the “building of the building body 10 is completed to a predetermined position”, for example, the vertical of the pillar 11 positioned at the corner C is obtained by completing the frame of the building body 10 to a predetermined height (level). This is when the load (axial force) can be transmitted to the seismic isolation device 31 arranged next to the corner C via the lower end beam 13 or the like.

仮設支保部材３２の撤去は、予め下端梁１３と基礎スラブ２１との間に介設されたジャッキにより下端梁１３を持ち上げた状態で、仮設支保部材３２を抜き出すことにより行う。   The temporary support member 32 is removed by extracting the temporary support member 32 in a state where the lower end beam 13 is lifted by a jack interposed between the lower end beam 13 and the foundation slab 21 in advance.

第三躯体構築工程は、仮設支保部材３２の撤去完了後、隅部Ｃに絶縁空間が形成された状態で引き続き建物本体１０（躯体）の施工を行い、免震建物１を完成させる工程である。
なお、例えば低層建物等、所定の軸力が免震装置３１に作用した段階で躯体の施工が完了している場合には、第三躯体構築工程は省略してもよい。 The third building construction process is a process of completing the seismic isolation building 1 by continuing the construction of the building body 10 (frame) with the insulating space formed at the corner C after the removal of the temporary support member 32 is completed. .
In addition, when the construction of the frame is completed at a stage where a predetermined axial force is applied to the seismic isolation device 31, such as a low-rise building, the third frame building process may be omitted.

以上、本実施形態の免震建物１および免震建物の構築方法によれば、鉛直荷重が小さい建物本体１０の四隅である隅部Ｃについて、免震装置３１を省略することで、コスト削減を図ることができる。   As described above, according to the base-isolated building 1 and the method for building a base-isolated building of the present embodiment, the cost reduction can be achieved by omitting the base-isolation device 31 for the corners C that are the four corners of the building body 10 having a small vertical load. Can be planned.

また、ロッキング振動による浮き上がりや沈み込みが発生する建物本体１０の隅部Ｃを、絶縁空間として免震装置３１を省略しているため、大きな引張軸力が建物本体１０、基礎２０に作用することを防止することができる。つまり、隅部Ｃに絶縁空間を形成してロッキング振動（浮き上がりや沈み込み）を許容しているため、ロッキング振動に対応した補強構造や高耐力構造を構築する必要がなく、施工の手間や費用を削減することができる。
また、ロッキング振動に対応した免震装置３１を配設する必要もないため、コストの低減化を図ることができる。 In addition, since the seismic isolation device 31 is omitted as an insulating space in the corner C of the building body 10 where lifting and sinking due to rocking vibration occurs, a large tensile axial force acts on the building body 10 and the foundation 20. Can be prevented. In other words, since an insulating space is formed in the corner C to allow rocking vibration (lifting and sinking), it is not necessary to construct a reinforcing structure or high-strength structure corresponding to the rocking vibration. Can be reduced.
Moreover, since it is not necessary to provide the seismic isolation device 31 corresponding to the rocking vibration, the cost can be reduced.

隅部Ｃ以外の各柱１１の下方には、免震装置３１が介設されているため、免震効果が低下することもない。   Since the seismic isolation device 31 is interposed below each pillar 11 other than the corner C, the seismic isolation effect does not decrease.

隅部Ｃの鉛直荷重は、隅部Ｃに位置する柱１１の隣に位置する柱１１の下方の免震装置３１を介して基礎２０に伝達されるため、免震建物１の安定性は維持されている。また、隅部Ｃに位置する柱１１の免震装置を省略し、隅部Ｃの隣に位置する免震装置３１が負担する軸力を大きくすることで免震装置３１に大きな引張力が作用するのを防止することができる。さらに隅部Ｃの隣に位置する免震装置３１に作用する軸力を大きくすることで、隅部Ｃにおける浮き上がりを抑制することができる。   Since the vertical load at the corner C is transmitted to the foundation 20 via the seismic isolation device 31 below the column 11 located next to the column 11 located at the corner C, the stability of the seismic isolation building 1 is maintained. Has been. In addition, a large tensile force acts on the seismic isolation device 31 by omitting the seismic isolation device of the column 11 located at the corner C and increasing the axial force borne by the seismic isolation device 31 located next to the corner C. Can be prevented. Further, by increasing the axial force acting on the seismic isolation device 31 located next to the corner C, the lifting at the corner C can be suppressed.

施工時においては、仮設支保部材３２により隅部Ｃの鉛直荷重を仮受けしているため、施工時の安定性が確保されている。また、建物本体１０の完成後、あるいは、建物本体１０が所定の位置まで完成した後に仮設支保部材３２を撤去すれば、ロッキング振動に伴なう浮き上がりや沈み込みを許容した免震建物１が構成される。   At the time of construction, since the vertical load of the corner C is temporarily received by the temporary support member 32, the stability at the time of construction is ensured. In addition, if the temporary support member 32 is removed after the building body 10 is completed or after the building body 10 is completed to a predetermined position, the seismic isolation building 1 that allows lifting and sinking due to rocking vibration is configured. Is done.

以上、本発明について、好適な実施形態について説明した。しかし、本発明は、前述の実施形態に限られず、前記の各構成要素については、本発明の趣旨を逸脱しない範囲で、適宜変更が可能である。   The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.

例えば、前記実施形態では、平面視が矩形状の免震建物１について説明したが、免震建物１の形状は、前記の形状に限定されるものではない。つまり、免震建物は、建物の形状に応じて、ロッキング振動に伴なう浮き上がりや沈み込みを許容することが可能となるように、少なくとも四つの隅部の柱１１と基礎２０との間に介設される免震装置を省略して絶縁空間を設ける構成とすればよい。   For example, although the said embodiment demonstrated the seismic isolation building 1 whose planar view was a rectangular shape, the shape of the seismic isolation building 1 is not limited to the said shape. In other words, the base-isolated building is located between the pillars 11 and the foundations 20 at least at the four corners so as to allow lifting and sinking associated with rocking vibration according to the shape of the building. What is necessary is just to set it as the structure which abbreviate | omits the installed seismic isolation apparatus and provides insulation space.

図４（ａ）に示すように、平面視した際に、凹部を備える免震建物１ａについては、矩形状の場合と同様に、四つの隅部Ｃについては、免震装置３１を省略し（絶縁空間を設け）、その他の位置について、免震装置３１を配置する。
また、図４（ｂ）に示すように、平面視で長方形の一部が切り欠かれた免震建物１ｂの場合には、他の隅部Ｃ，Ｃ，Ｃに加えて、切りかかれた部分に面する２箇所の出隅（隅部）Ｃ’，Ｃ’について免震装置３１を省略する（絶縁空間を設ける）構成とし、ロッキング振動に伴なう浮き上がりや沈み込みを許容すればよい。なお、建物本体１０の平面形状に応じて、２つの出隅Ｃ’ ，Ｃ’うちのいずれか一方に免震装置３１を配置してもよい。 As shown in FIG. 4 (a), the seismic isolation device 31 is omitted for the four corners C as in the case of the rectangular shape for the seismic isolation building 1a having a recess when viewed in plan ( An isolation space is provided), and the seismic isolation device 31 is disposed at other positions.
In addition, as shown in FIG. 4B, in the case of the base-isolated building 1b in which a part of the rectangle is cut out in plan view, in addition to the other corners C, C, C, the cut part The seismic isolation device 31 may be omitted (provided with an insulating space) for the two protruding corners (corners) C ′ and C ′ facing the surface, and lifting and sinking due to rocking vibration may be allowed. Note that the seismic isolation device 31 may be arranged at one of the two protruding corners C ′ and C ′ according to the planar shape of the building body 10.

１ 免震建物
１０ 建物本体
１１ 柱
１２ 梁
１３ 下端梁
２０ 基礎
２１ 基礎梁
２２ 基礎杭
３０ 免震層
３１ 免震装置
３２ 仮設支保部材
Ｃ 隅部 DESCRIPTION OF SYMBOLS 1 Base isolation building 10 Building body 11 Column 12 Beam 13 Bottom beam 20 Foundation 21 Foundation beam 22 Foundation pile 30 Base isolation layer 31 Base isolation device 32 Temporary support member
C Corner

Claims (2)

地震時入力を低減する免震層が所定の階層に設けられていて、地震時に建物端部が上下に動いてロッキング振動する免震建物であって、
前記免震層では、当該免震層の直上階の平面の少なくとも四つの隅部に位置する柱の下方に免震装置を設けず、当該柱の浮き上がりや沈み込みを許容することが可能な絶縁空間が設けられているとともに、それ以外の柱の下方には免震装置が設置されていることを特徴とする、免震建物。 A seismic isolation layer that reduces seismic input is provided at a predetermined level, and the building edge moves up and down during an earthquake and rocks and vibrates .
In the seismic isolation layer, the base is not provided with a seismic isolation device below at least four corners of the plane directly above the seismic isolation layer, and it is possible to allow the column to lift and sink. A seismically isolated building, characterized by a space and a seismic isolation device installed below the other pillars. 平面の少なくとも四つの隅部に立設される柱の位置に対応して仮設支保部材を配置するとともに、それ以外の柱の位置に対応して免震装置を配置して免震層を形成する工程と、
前記仮設支保部材および前記免震装置により柱を支持した状態で前記免震層より上の躯体の施工を行う工程と、
前記躯体の施工が所定の高さまで進んだ後に前記仮設支保部材を撤去して、前記隅部に立設された柱の下方に免震装置を設けず、当該柱の浮き上がりや沈み込みを許容することが可能な絶縁空間を設ける工程と、を備えることを特徴とする、免震建物の構築方法。 Temporary support members are arranged corresponding to the positions of the pillars erected at at least four corners of the plane, and seismic isolation devices are arranged corresponding to the positions of the other pillars to form the seismic isolation layer. Process,
A step of constructing a frame above the seismic isolation layer in a state where a column is supported by the temporary support member and the seismic isolation device;
The temporary support member is removed after the construction of the frame has progressed to a predetermined height, and a seismic isolation device is not provided below the column erected at the corner , allowing the column to float or sink. And a step of providing an insulating space that is capable of providing a seismic isolation building.
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