JP5769105B2 - Seismic isolation device sensitivity control structure - Google Patents

Seismic isolation device sensitivity control structure Download PDF

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JP5769105B2
JP5769105B2 JP2011042760A JP2011042760A JP5769105B2 JP 5769105 B2 JP5769105 B2 JP 5769105B2 JP 2011042760 A JP2011042760 A JP 2011042760A JP 2011042760 A JP2011042760 A JP 2011042760A JP 5769105 B2 JP5769105 B2 JP 5769105B2
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seismic isolation
isolation device
peripheral wall
annular peripheral
building
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JP2012180651A (en
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一 藤野
一 藤野
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Sumitomo Forestry Co Ltd
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Description

本発明は、免震装置の感度規制構造に関し、特に、横移動可能に建物を支持する免震装置の感度を規制するための感度規制構造に関する。   The present invention relates to a sensitivity regulation structure for a seismic isolation device, and more particularly to a sensitivity regulation structure for regulating the sensitivity of a seismic isolation device that supports a building so as to be laterally movable.

例えば住宅建築物等の比較的小規模な建物では、施工が難しいことや、建築コストが割高になることなどから、建物の基礎部分に免震装置を用いた免震構造が設置されることは極めてまれである。すなわち、鉄筋コンクリート製の構造物等の比較的大規模な建物の基礎部分に設けられる従来の免震構造は、地震時に免震装置の機能によって建物の基礎を横移動可能とする必要があることから、建物の基礎の全体を、例えば改良地盤やコンクリート製の底盤等からなる耐圧底盤から浮かせた状態で設ける必要がある（例えば、特許文献１参照）。また、従来の免震構造では、建物の基礎の全体を耐圧底盤から浮かせた状態とすることで、風等による小さな加速度でも建物が敏感に反応することになって、地震が発生するまでの間、建物が横移動しないようにするために、免震装置の周囲にダンパー等の設備を設けて、免震装置の感度を規制できるようにすることが必要とされている。   For example, in a relatively small building such as a residential building, it is difficult to construct and the construction cost is expensive. Extremely rare. In other words, conventional seismic isolation structures installed on the foundations of relatively large buildings, such as reinforced concrete structures, require that the foundation of the building can be moved laterally by the function of the seismic isolation device during an earthquake. It is necessary to provide the entire building foundation in a state of floating from a pressure-resistant bottom plate made of, for example, an improved ground or a concrete bottom plate (see, for example, Patent Document 1). In addition, in the conventional seismic isolation structure, the entire building foundation is lifted from the pressure-resistant floor so that the building reacts sensitively even with small accelerations caused by wind, etc., until the earthquake occurs. In order to prevent the building from moving laterally, it is necessary to provide a facility such as a damper around the seismic isolation device so that the sensitivity of the seismic isolation device can be regulated.

このため、このような従来の免震構造を住宅建築物等の比較的小規模な建物に適用しようとする場合には、例えば鉄筋コンクリート製の建物の基礎の全体を２重構造とする必要を生じ、基礎部分の工事が大規模になって施工コストが増大すると共に、ダンパー等の設備を設けることでさらにコストが増大することになる。   For this reason, when applying such a conventional seismic isolation structure to a relatively small building such as a residential building, for example, the entire foundation of a reinforced concrete building needs to have a double structure. The construction of the foundation portion becomes large and the construction cost increases, and the installation of a facility such as a damper further increases the cost.

特開２００３−１０５７１５号公報JP 2003-105715 A 特開２０１０−１０１０１３号公報JP 2010-101013 A 特開２０１０−２７５８０２号公報JP 2010-275802 A 特開２００２−２９５１７０号公報JP 2002-295170 A 特開２０１０−６５４００号公報JP 2010-65400 A

一方、地震時に例えば間隙水を多く含む地盤が液状化する現象は良く知られており、また例えば液状化した砂質地盤の上で水平移動した家屋の基礎及び構造体の被害は、軽微だったという報告例も種々あることが知られている。このようなことから、例えば地震時に軟弱な地盤の液状化を誘発させ、構造物の水平振動を減衰させることで、免震機能が得られるようにした免震構造も開発されている（例えば、特許文献２、特許文献３参照）。   On the other hand, the phenomenon of ground liquefied, for example, with a lot of pore water during an earthquake is well known. For example, damage to the foundations and structures of houses that moved horizontally on liquefied sandy ground was minor. It is known that there are various report examples. For this reason, for example, seismic isolation structures have been developed that can provide seismic isolation functions by inducing liquefaction of soft ground during earthquakes and attenuating horizontal vibrations of structures (for example, (See Patent Document 2 and Patent Document 3).

また、例えば主に土木工事において用いられる簡易な山留め材料として、ライナープレートが知られている（例えば、特許文献４、特許文献５参照）。ライナープレートは、例えば２．７〜７ｍｍ程度の厚さを有する薄い鋼板を、縦方向の断面が波形形状となるように加工すると共に、横長矩形の正面形状を備えるように形成された部材である（図６（ａ）〜（ｃ）参照）。ライナープレートは、周方向に一体として連接されて円形、長円形、矩形等の平面形状の環状周壁を形成できるように、円弧状、直線状、Ｌ字状等の平面形状を備えるように形成されており、横長矩形の正面形状の上下の縁部には接合用の周方向フランジ部が、左右の縁部には接合用の軸方向フランジ部が各々設けられている。   Further, for example, liner plates are known as simple retaining materials used mainly in civil engineering (see, for example, Patent Document 4 and Patent Document 5). The liner plate is a member formed to process a thin steel plate having a thickness of, for example, about 2.7 to 7 mm so that the longitudinal section has a corrugated shape, and to have a horizontally-long rectangular front shape. (Refer to Drawing 6 (a)-(c)). The liner plate is formed to have a planar shape such as an arc shape, a straight line shape, and an L shape so that it can be connected integrally in the circumferential direction to form a circular circumferential wall having a circular shape, an oval shape, a rectangular shape or the like. In addition, a circumferential flange portion for joining is provided at the upper and lower edges of the horizontally long rectangular front shape, and an axial flange portion for joining is provided at the left and right edges, respectively.

そして、軸方向フランジ部による縦方向接合部を介して、複数のライナープレートを周方向に環状に接合一体化すると共に、これらを複数段に積み重ねて、周方向フランジ部による横方向接合部を介して上下方向に接合一体化することで、所望の高さの環状周壁を、周囲の地盤からの土圧や水圧を効率良く且つ効果的に支持する山留め壁として、簡易に且つ容易に形成できるようになっている。このようなライナープレートによる山留め壁は、例えば土木工事における推進工法用立坑や、深礎工法用立坑や、集水井等を施工する際に、直径が１５００〜６５００ｍｍ程度の大きさの縦穴を、土圧や水圧を安定して支持した状態で形成できる簡易な構造物として多用されている。   Then, the plurality of liner plates are joined and integrated in the circumferential direction through the longitudinal joint portion by the axial flange portion, and these are stacked in a plurality of stages, via the lateral joint portion by the circumferential flange portion. By joining and integrating in the vertical direction, it is possible to easily and easily form an annular peripheral wall of a desired height as a retaining wall that efficiently and effectively supports earth pressure and water pressure from the surrounding ground. It has become. Such a retaining wall with a liner plate is a vertical hole having a diameter of about 1500 to 6500 mm when constructing a shaft for a propulsion method, a shaft for a deep foundation method, a drainage well, etc. in civil engineering work. It is frequently used as a simple structure that can be formed in a state where pressure and water pressure are stably supported.

また、例えば土木工事においては、ライナープレートに限定されることなく、その他の種々の合成樹脂製や鋼製の環状周壁を山留め壁として用いて、土圧や水圧を安定した状態で支持できる縦穴を簡易に形成することが行われている。 Also, for example, in civil engineering work, without being limited to liner plates, other various synthetic resin or steel annular peripheral walls are used as retaining walls, and vertical holes that can stably support earth pressure and water pressure are formed. Simple formation is performed.

本発明は、例えばライナープレートによる環状周壁を用いて地盤面に縦穴を形成して、基礎部分の大規模な工事を要することなく、効率良く且つ安価に設けられた免震構造と組み合わせることで、簡易な構成によって、風等による小さな加速度では建物が移動しないように免震装置を効果的に規制することができると共に、地震が発生した際には、液状化を利用して免震装置による免震機能をスムーズに発揮させることのできる免震装置の感度規制構造を提供することを目的とする。   The present invention, for example, by forming a vertical hole in the ground surface using an annular peripheral wall by a liner plate, without requiring a large-scale construction of the foundation part, combined with a seismic isolation structure provided efficiently and inexpensively, With a simple configuration, it is possible to effectively regulate the seismic isolation device so that the building does not move with a small acceleration due to wind, etc., and in the event of an earthquake, liquefaction is used to eliminate the seismic isolation device. It aims at providing the sensitivity control structure of the seismic isolation device which can exhibit a seismic function smoothly.

本発明は、建物の基礎の下面と耐圧底盤との間に介在して設けられて横移動可能に建物を支持する免震装置の感度を規制するための感度規制構造であって、前記免震装置を中央部分に配置して、前記耐圧底盤から立設して設けられた環状周壁と、前記免震装置と前記環状周壁との間の間隔部分を埋めるようにして、前記環状周壁の内側に収容された液状化誘発土と、前記環状周壁の内側に貯留された液状化誘発水とを含んで構成され、再攪拌用の水中ポンプを備える免震装置の感度規制構造を提供することにより、上記目的を達成したものである。 The present invention is a sensitivity regulating structure for regulating the sensitivity of a seismic isolation device that is interposed between a lower surface of a foundation of a building and a pressure-resistant bottom plate and supports the building so as to be laterally movable. An apparatus is arranged at the center portion, and an annular peripheral wall provided upright from the pressure-resistant bottom plate and a gap between the seismic isolation device and the annular peripheral wall are filled, and the apparatus is disposed inside the annular peripheral wall. By providing the sensitivity control structure of the seismic isolation device including the contained liquefaction-inducing soil and the liquefaction-inducing water stored inside the annular peripheral wall, and including the submersible pump for re-stirring , The above objective has been achieved.

そして、本発明の免震装置の感度規制構造は、前記環状周壁が、複数のライナープレートを、周方向に環状に接合一体化すると共に複数段に積み重ねて上下方向に接合一体化することで、前記耐圧底盤から立設して設けられていることが好ましい。 And the sensitivity control structure of the seismic isolation device of the present invention is such that the annular peripheral wall is formed by joining and integrating the plurality of liner plates in the circumferential direction and stacking in a plurality of stages and joining and integrating in the vertical direction. It is preferable to be provided upright from the pressure-resistant bottom plate.

本発明の免震装置の感度規制構造によれば、例えばライナープレートによる環状周壁を用いて地盤面に縦穴を形成して、基礎部分の大規模な工事を要することなく、効率良く且つ安価に設けられた免震構造と組み合わせることで、簡易な構成によって、風等による小さな加速度では建物が移動しないように免震装置を効果的に規制することができると共に、地震が発生した際には、液状化を利用して免震装置による免震機能をスムーズに発揮させることができる。   According to the sensitivity control structure of the seismic isolation device of the present invention, a vertical hole is formed in the ground surface using, for example, an annular peripheral wall by a liner plate, and it is provided efficiently and inexpensively without requiring large-scale construction of the foundation portion. In combination with the seismic isolation structure, it is possible to effectively regulate the seismic isolation device so that the building does not move with a small acceleration due to wind, etc. The seismic isolation function of the seismic isolation device can be exhibited smoothly using the system.

本発明の好ましい一実施形態に係る免震装置の感度規制構造を用いた建物の免震基礎構造を説明する略示斜視図である。It is a schematic perspective view explaining the base isolation structure of a building using the sensitivity control structure of the base isolation device according to a preferred embodiment of the present invention. 本発明の好ましい一実施形態に係る免震装置の感度規制構造を用いた建物の免震基礎構造を説明する略示上面図である。It is a schematic top view explaining the base isolation structure of the building using the sensitivity control structure of the base isolation apparatus which concerns on preferable one Embodiment of this invention. 本発明の好ましい一実施形態に係る免震装置の感度規制構造を用いた建物の免震基礎構造を説明する、図２のＡ−Ａに沿った部分破断略示断面図である。FIG. 3 is a partially broken schematic cross-sectional view taken along line A-A in FIG. 2 for explaining a base isolation structure for a building using a sensitivity control structure of a base isolation device according to a preferred embodiment of the present invention. 本発明の好ましい一実施形態に係る免震装置の感度規制構造の構成を説明する、図１のＣ部拡大斜視図である。It is the C section expansion perspective view of FIG. 1 explaining the structure of the sensitivity control structure of the seismic isolation apparatus which concerns on preferable one Embodiment of this invention. 本発明の好ましい一実施形態に係る免震装置の感度規制構造の構成を説明する断面図である。It is sectional drawing explaining the structure of the sensitivity control structure of the seismic isolation apparatus which concerns on preferable one Embodiment of this invention. （ａ）はライナープレートの正面図、（ｂ）は（ａ）のＢ−Ｂに沿った断面図、（ｃ）は上面図である。(A) is a front view of a liner plate, (b) is a sectional view along BB of (a), and (c) is a top view. ライナープレートの周方向フランジ部による接合部を説明する拡大断面図である。It is an expanded sectional view explaining the junction part by the circumferential direction flange part of a liner plate.

図４及び図５に示す本発明の好ましい一実施形態に係る免震装置の感度規制構造１０は、例えば図１〜図３に示すように、建物として例えば住宅建築物の基礎１１の下方の地中に、例えばライナープレート１２（図６（ａ）〜（ｃ）参照）を用いて、例えば直径が１５００ｍｍ程度の円形の縦穴１３を複数箇所（本実施形態では、７箇所）に形成し、各縦穴１３に免震装置１６を各々設置して建物の基礎１１を支持させることで、当該建物の基礎１１を横移動可能として、免震装置１６による免震機能を効果的に発揮させる免震基礎構造３０において採用されたものである。本実施形態の免震装置の感度規制構造１０は、縦穴１３の内部に収容された液状化誘発土１９によって、地震が発生するまでの間、免震装置１６が作動しないように規制して、風等による小さな加速度では建物が移動しないように制御する機能を備える。   The sensitivity control structure 10 of the seismic isolation device according to a preferred embodiment of the present invention shown in FIGS. 4 and 5 is a ground below a foundation 11 of a residential building, for example, as shown in FIGS. Inside, for example, using a liner plate 12 (see FIGS. 6A to 6C), for example, circular vertical holes 13 with a diameter of about 1500 mm are formed at a plurality of locations (in this embodiment, 7 locations) By installing the seismic isolation devices 16 in the vertical holes 13 to support the foundation 11 of the building, the base 11 of the building can be moved laterally and the seismic isolation function by the seismic isolation device 16 is effectively exhibited. The structure 30 is adopted. The sensitivity control structure 10 of the seismic isolation device according to the present embodiment regulates the seismic isolation device 16 so as not to operate until an earthquake occurs by the liquefaction-induced soil 19 accommodated in the vertical hole 13. It has a function to control the building so that it does not move with small accelerations such as wind.

ここで、本実施形態で縦穴１３の環状周壁１４を形成するライナープレート１２は、主に土木工事において用いる簡易な山留め材料として公知の部材であり、例えば図６（ａ）〜（ｃ）に示すように、２．７〜７ｍｍ程度の厚さを有する薄い鋼板を、縦方向の断面が波形形状となるように加工すると共に、例えば５００ｍｍ程度の高さの横長矩形の正面形状を備えるように形成された、作業員の手作業によっても組み立てが可能な軽量の山留め部材である。またライナープレート１２は、周方向に連接されて、例えば直径が１３００〜２０００ｍｍ程度の円筒形状の環状周壁１４（図１、図４参照）を形成できるように、例えば曲率半径が６５０〜１０００ｍｍ程度の円弧状の平面形状を備えるように形成されている。ライナープレート１２の横長矩形の正面形状の上下の縁部には、複数のボルト孔を備える接合用の周方向フランジ部１２ａが、左右の縁部には、複数のボルト孔を備える接合用の軸方向フランジ部１２ｂが各々設けられている。   Here, the liner plate 12 that forms the annular peripheral wall 14 of the vertical hole 13 in the present embodiment is a known member as a simple retaining material mainly used in civil engineering work, for example, as shown in FIGS. As described above, a thin steel plate having a thickness of about 2.7 to 7 mm is processed so that the cross section in the vertical direction has a corrugated shape, and is formed to have a horizontally-long rectangular front shape with a height of about 500 mm, for example. It is a light weight retaining member that can be assembled by a worker's manual work. Further, the liner plate 12 is connected in the circumferential direction to form a cylindrical annular peripheral wall 14 (see FIGS. 1 and 4) having a diameter of about 1300 to 2000 mm, for example, and has a curvature radius of about 650 to 1000 mm, for example. It is formed to have an arcuate planar shape. A circumferential flange portion 12a for joining provided with a plurality of bolt holes at the upper and lower edges of the horizontally long rectangular front shape of the liner plate 12, and a joining shaft provided with a plurality of bolt holes at the left and right edges. Directional flange portions 12b are respectively provided.

ライナープレート１２は、公知の工法と同様に、例えば地盤面を掘り下げながら、掘り下げられた掘削穴の側壁面を覆って当該ライナープレート１２を設置すると共に、掘り下げの進行に伴って、設置したライナープレート１２の下方に、下段のライナープレート１２を、掘削壁面を覆って順次差し込んで行く方法によって地中に設置することができる。また、設置されたライナープレート１２は、軸方向フランジ部１２ｂによる縦方向接合部を介して、周方向にリング状に接合一体化されると共に、図７に示すように、周方向フランジ部１２ａによる横方向接合部を介して、上下方向に接合一体化される。これらによって、リング状に組み立てられたライナープレート１２が複数段に積み重ねられて、所望の高さの環状周壁１４が、周囲の地盤からの土圧や水圧を効果的に支持する山留め壁として、主として作業員の手作業によって簡易に且つ容易に形成されることになる。   As in the known method, the liner plate 12 covers the side wall surface of the excavated hole while digging the ground surface, for example, and the liner plate 12 is installed as the digging progresses. Below 12, the lower liner plate 12 can be installed in the ground by a method of inserting it sequentially covering the excavation wall surface. Further, the installed liner plate 12 is joined and integrated in a ring shape in the circumferential direction via a longitudinal joining portion by the axial flange portion 12b, and as shown in FIG. 7, by the circumferential flange portion 12a. They are joined and integrated in the up and down direction via the lateral joint. As a result, the liner plates 12 assembled in a ring shape are stacked in a plurality of stages, and the annular peripheral wall 14 having a desired height is mainly used as a retaining wall that effectively supports earth pressure and water pressure from the surrounding ground. It is easily and easily formed by the manual operation of the worker.

そして、本実施形態の免震装置の感度規制構造１０は、図１〜図３に示すように、建物（住宅建築物）の基礎１１の下面と耐圧底盤１５との間に介在して設けられて横移動可能に建物を支持する免震装置１６の感度を規制するための制御構造であって、図４及び図５にも示すように、免震装置１６を中央部分に配置して、耐圧底盤１５から立設して設けられた環状周壁１４と、免震装置１６と環状周壁１４との間の間隔部分を埋めるようにして、環状周壁１４の内側に収容された液状化誘発土１９と、環状周壁１４の内側に貯留された液状化誘発水２０とを含んで構成されている。 And the sensitivity control structure 10 of the seismic isolation apparatus of this embodiment is interposed and provided between the lower surface of the foundation 11 and the pressure | voltage resistant bottom board 15 of a building (house building), as shown in FIGS. Te a control structure for regulating the sensitivity of the seismic isolation device 16 for lateral movement supporting the building, as shown in FIGS. 4 and 5, by arranging the isolator 16 in the central portion, the breakdown voltage An annular peripheral wall 14 provided upright from the bottom 15, and a liquefaction-induced soil 19 accommodated inside the annular peripheral wall 14 so as to fill a gap between the seismic isolation device 16 and the annular peripheral wall 14. The liquefaction induction water 20 stored inside the annular peripheral wall 14 is included.

本実施形態では、建物である住宅建築物の基礎１１は、基礎スラブ１１ａと立上り部１１ｂとからなるべた基礎となっており、例えば横幅が５〜２０ｍ程度、縦幅が５〜２０ｍ程度の大きさの、横長の略矩形の平面形状を備えるように形成されている。基礎１１は、例えば基礎砕石等を敷き均した後に、鉄筋やコンクリートを用いて容易に形成することができる。なお、本実施形態では、基礎１１を形成するのに先立って、免震装置１６が設置される箇所に、地盤面から地中に向けて支持杭１７が打設されると共に、縦穴１３を構成する環状周壁１４や耐圧底盤１５が形成されることになる。また、図１〜図５等においては、基礎１１よりも上方の住宅建築物の本体部分を省略して、基礎１１の部分のみが示されている。 In this embodiment, foundation 11 residential buildings is building, has a solid foundation consisting of a base slab 11a and the rising portion 11b, for example, the width is about 5 to 20 m, the vertical width is about 5 to 20 m size It is formed so as to have a horizontally long substantially rectangular planar shape. The foundation 11 can be easily formed using, for example, reinforcing bars or concrete after laying and leveling foundation crushed stone or the like. In the present embodiment, prior to the formation of the foundation 11, the support pile 17 is driven from the ground surface to the ground at the place where the seismic isolation device 16 is installed, and the vertical hole 13 is configured. An annular peripheral wall 14 and a pressure-resistant bottom board 15 are formed. Moreover, in FIGS. 1-5 etc., the main-body part of the residential building above the foundation 11 is abbreviate | omitted, and only the part of the foundation 11 is shown.

本実施形態では、建物の基礎１１の下方に形成される免震装置１６を設置するための縦穴１３は、底面部の耐圧底盤１５と、周面部の環状周壁１３とによって周囲を囲まれて形成されている。耐圧底盤１５は、好ましくはコンクリート製の底盤となっており、例えば上述の方法によって、ライナープレート１２を設置しながら免震装置１６の設置予定箇所の地盤を所定の深さまで掘り下げて、環状周壁１４を形成した後に、環状周壁１４の底部の地盤をさらに掘り下げて基礎砕石等を敷き均し、適宜補強用の鉄筋を配筋した後に、コンクリートを打設して硬化させることによって、容易に形成することができる。耐圧底盤１５は、本実施形態では、例えば１００〜３００ｍｍ程度の厚さで形成される。   In the present embodiment, the vertical hole 13 for installing the seismic isolation device 16 formed below the foundation 11 of the building is formed so as to be surrounded by the pressure-resistant bottom plate 15 on the bottom surface portion and the annular peripheral wall 13 on the peripheral surface portion. Has been. The pressure-resistant bottom plate 15 is preferably a concrete-made bottom plate. For example, by installing the liner plate 12, the ground where the seismic isolation device 16 is planned to be installed is dug down to a predetermined depth by the above-described method. After forming, the ground at the bottom of the annular peripheral wall 14 is further dug down, ground crushed stones and the like are laid, and reinforcing bars are placed appropriately, and then concrete is placed and hardened to form easily. be able to. In the present embodiment, the pressure-resistant bottom plate 15 is formed with a thickness of about 100 to 300 mm, for example.

本実施形態では、環状周壁１４は、上述のように、ライナープレート１２を設置しながら住宅建築物の建築予定箇所の地盤を所定の深さまで掘り下げることによって、複数のライナープレート１２が周方向に連接して円形のリング形状に組み立てられると共に、かかるリング形状のものが複数段（本実施形態では、例えば３段）に積み重ねられることによって、例えば１５００ｍｍ程度の直径を有すると共に、１５００ｍｍ程度の高さを有する円筒形状の土留め壁として形成される。環状周壁１４の直径や高さは、免震装置１６の大きさや高さ、軟弱地盤の土質等を鑑みて、適宜設計することができる。   In the present embodiment, as described above, the annular peripheral wall 14 is connected to the plurality of liner plates 12 in the circumferential direction by digging the ground of the planned construction site of the house building to a predetermined depth while installing the liner plate 12. As a result of being assembled into a circular ring shape, the ring-shaped ones are stacked in a plurality of stages (in this embodiment, for example, three stages), thereby having a diameter of, for example, about 1500 mm and a height of about 1500 mm. It is formed as a cylindrical earth retaining wall. The diameter and height of the annular peripheral wall 14 can be appropriately designed in view of the size and height of the seismic isolation device 16, the soil quality of the soft ground, and the like.

また、組み立てられた複数のライナープレート１２による環状周壁１４には、公知のライナープレートによる立坑等と同様に、止水処理等が施されると共に、ライナープレート１２の外周面を覆って断熱材を取り付けておくことができる。さらに、例えば環状周壁１４の外側の、掘り下げられた掘削穴の掘削内壁面との間の隙間には、環状周壁１４に形成した注入孔を介して、裏込材として例えば発泡モルタルを、環状周壁１４の内側からの作業によって注入充填することにより、周囲の地盤からの土圧や水圧を、環状周壁１４によって安定した状態で支持させることが可能になる。   Further, the annular peripheral wall 14 formed by the plurality of liner plates 12 is subjected to a water stop treatment or the like, similarly to a shaft using a known liner plate, and covers the outer peripheral surface of the liner plate 12 with a heat insulating material. Can be attached. Further, for example, foamed mortar is used as a backing material in the gap between the outer peripheral wall of the annular peripheral wall 14 and the inner wall surface of the excavated excavation hole through the injection hole formed in the annular peripheral wall 14. By injecting and filling by work from the inside of 14, it becomes possible to stably support the earth pressure and water pressure from the surrounding ground by the annular peripheral wall 14.

本実施形態では、複数形成された縦穴１３に各々設置される免震装置１６として、例えば積層ゴムや積層バネ等からなる、公知の各種の免震装置１６を用いることができる。免震装置１６は、例えば縦横３００〜６００ｍｍ程度、又は直径が３００〜６００ｍｍ程度の大きさの、４角形や円形の断面形状を備えるように形成されており、端面接合プレートや、インサートボルト等を用いた公知の方法によって、その上端部や下端部が、建物の基礎１１の下面や、耐圧底盤１５の上面に、安定した状態で接合固定される。   In the present embodiment, various known seismic isolation devices 16 made of, for example, laminated rubber or laminated springs can be used as the seismic isolation devices 16 installed in the plurality of formed vertical holes 13. The seismic isolation device 16 is formed so as to have a quadrangular or circular cross-sectional shape having a size of about 300 to 600 mm in length and width, or about 300 to 600 mm in diameter, and includes an end face joining plate, an insert bolt, and the like. By the well-known method used, the upper end part and the lower end part are joined and fixed in a stable state to the lower surface of the foundation 11 of the building and the upper surface of the pressure-resistant bottom board 15.

また、本実施形態では、縦穴１３の内部を充填するようにして、環状周壁１４の内側に収容される液状化誘発土１９として、例えば細粒度含有率が１０％程度と低く、大多数の粒径が０．１ｍｍ〜１．０ｍｍの間にある比較的均一の砂質土を用いることができる。なお、液状化誘発土１９は、土や砂以外のものであっても良く、例えば、均質な粒径を有する樹脂ビーズやガラスビーズなどの粒状材料を用いることもできる。   Moreover, in this embodiment, as the liquefaction induction soil 19 accommodated inside the annular peripheral wall 14 so as to fill the inside of the vertical hole 13, for example, the fine particle content is as low as about 10%, and a large number of particles A relatively uniform sandy soil having a diameter between 0.1 mm and 1.0 mm can be used. The liquefaction-inducing soil 19 may be other than soil or sand, and for example, a granular material such as resin beads or glass beads having a uniform particle diameter may be used.

さらに、本実施形態では、縦穴１３の内部に供給されて、環状周壁１４の内側に貯留される液状化誘発水２０として、例えば水道水等の各種の水やその他の種々の液体を用いることができる。液状化誘発水２０は、液状化誘発土１９の間隙水となり、地震の発生時には、液状化誘発土１９を液状化させることで有効応力を低下させて、免震装置１６を横移動可能な状態とする。   Furthermore, in this embodiment, as the liquefaction induction water 20 supplied to the inside of the vertical hole 13 and stored inside the annular peripheral wall 14, various waters such as tap water and other various liquids are used. it can. The liquefaction inducing water 20 becomes pore water of the liquefaction inducing soil 19, and when an earthquake occurs, the effective stress is reduced by liquefying the liquefaction inducing soil 19 so that the seismic isolation device 16 can be moved laterally. And

ここで、液状化は、例えば細かい砂が緩く積もった地盤に起こる現象として知られており、間隙水を含む細かい砂が、地震などによる振動を受けることによって間隙水に押し上げられることで、支持力がなくなって液体に近い状態となる現象である。本実施形態の感度規制構造１０は、このような液状化現象を利用して、地震が発生するまでは免震装置１６と環状周壁１４との間の間隔部分を埋めるようにして収容された液状化誘発土１９の有効応力によって、風等による小さな加速度では建物が移動しないように免震装置１６を規制すると共に、地震が発生した際には、液状化誘発土１９を液状化させて、免震装置１６による免震機能をスムーズに発揮させることができるようなっている。   Here, liquefaction is known as a phenomenon that occurs, for example, in the ground where fine sand is loosely piled up, and the fine sand containing pore water is pushed up by pore water by receiving vibration due to earthquakes, etc. It is a phenomenon that disappears and becomes a liquid state. The sensitivity regulating structure 10 of the present embodiment utilizes such a liquefaction phenomenon, and the liquid contained in the space between the seismic isolation device 16 and the annular peripheral wall 14 until the earthquake occurs. The seismic isolation device 16 is restricted by the effective stress of the liquefaction-inducing soil 19 so that the building does not move at a small acceleration due to wind or the like, and when an earthquake occurs, the liquefaction-inducing soil 19 is liquefied and immunized. The seismic isolation function by the seismic device 16 can be exhibited smoothly.

また、本実施形態の感度規制構造１０は、環状周壁１４の内側に収容された液状化誘発土１９を、液状化誘発水２０と共に攪拌することが可能な再攪拌用の水中ポンプ２１を備えている（図５参照）。再攪拌用の水中ポンプ２１を備えていることにより、感度規制構造１０を、地震の度毎に何回も使用することが可能になる。すなわち、例えば地震が発生して免震装置１６の作用によって建物が横移動している状態から、地震がおさまった後に例えばジャッキ装置等を用いて建物を元の位置に戻すと共に、液状化している液状化誘発土１９を、水中ポンプ２１によって液状化誘発水２０と共に攪拌して安定させることにより、液状化誘発土１９に有効応力を再び生じさせて、風等による小さな加速度では免震装置１６が作動しないように規制することが可能になる。   Further, the sensitivity regulating structure 10 of the present embodiment includes a re-stirring submersible pump 21 capable of stirring the liquefaction-induced soil 19 accommodated inside the annular peripheral wall 14 together with the liquefaction-induced water 20. (See FIG. 5). By including the sub-pump 21 for re-stirring, the sensitivity control structure 10 can be used many times for each earthquake. That is, for example, after the earthquake has occurred and the building is moving laterally by the action of the seismic isolation device 16, the building is returned to its original position using, for example, a jack device after the earthquake is stopped, and liquefied. By agitating and stabilizing the liquefaction inducing soil 19 together with the liquefaction inducing water 20 by the submersible pump 21, effective stress is generated again in the liquefaction inducing soil 19, and the seismic isolation device 16 is operated at a small acceleration by wind or the like. It is possible to restrict the operation so that it does not operate.

本実施形態では、環状周壁１４によって周囲を囲まれる縦穴１３の上方に建物（住宅建築物）の基礎１１を形成する際には、例えば環状周壁１４の内側に配置したパイプサポートに支持させて、スラブ型枠等を組み立てた後に、コンクリートを打設することによって、免震装置１６によって下方から支持される基礎１１を、容易に形成することができる。またこれによって、建物（住宅建築物）の基礎１１は、免震装置１６によって支持されることで、好ましくは地盤面から浮いた状態で設置されることになり、これによって地震時に、免震装置１６の機能によってスムーズに横移動することが可能になる。なお、建物の基礎１１の周縁部分に形成される縦穴１３は、これの外側部分が基礎１１の外側にはみ出して、地盤面に開口することになるが、このような開口部部分を覆って各種の公知の蓋部材１８を取り付けておくことで、作業員や居住者等の移動や歩行に影響を及ぼさないようにすることが可能になる。   In this embodiment, when forming the foundation 11 of a building (residential building) above the vertical hole 13 surrounded by the annular peripheral wall 14, for example, it is supported by a pipe support arranged inside the annular peripheral wall 14, By assembling concrete after assembling the slab formwork or the like, the foundation 11 supported from below by the seismic isolation device 16 can be easily formed. Also, by this, the foundation 11 of the building (residential building) is supported by the seismic isolation device 16, and is preferably installed in a state of floating from the ground surface. The 16 functions enable smooth lateral movement. In addition, the vertical hole 13 formed in the peripheral part of the foundation 11 of a building will project the outer part of this to the outer side of the foundation 11, and will open to a ground surface, but covers such an opening part, and various By attaching the known lid member 18, it becomes possible not to affect the movement and walking of workers and residents.

また、本実施形態では、縦穴１３を構成する耐圧底盤１５の下方の地中に、例えば鋼管杭、ＰＣ杭、木製杭等からなる公知の支持杭１７が打設されており、これらの支持杭１７の上端部に載置接合されて、耐圧底盤１５が形成されている。これによって、建物の基礎１１は、免震装置１６及び耐圧底盤１５を介在させて、支持杭１７によって下方の地盤から強固に且つより安定した状態で支持されることになる。   Moreover, in this embodiment, the well-known support pile 17 which consists of a steel pipe pile, PC pile, a wooden pile etc. is laid in the underground under the pressure | voltage resistant bottom board 15 which comprises the vertical hole 13, These support piles, for example. A pressure-resistant bottom plate 15 is formed by being placed and joined to the upper end portion of 17. As a result, the foundation 11 of the building is supported by the support pile 17 in a stronger and more stable state by the support pile 17 with the seismic isolation device 16 and the pressure-resistant bottom plate 15 interposed therebetween.

そして、上述の構成を備える本実施形態の感度規制構造１０によれば、例えばライナープレート１２による環状周壁１４を用いて地盤面に縦穴１３を形成して、基礎部分の大規模な工事を要することなく、効率良く且つ安価に設けられた免震構造と組み合わせることで、簡易な構成によって、風等による小さな加速度では建物が移動しないように免震装置１６を効果的に規制することが可能になると共に、地震が発生した際には、液状化を利用して免震装置１６による免震機能をスムーズに発揮させることが可能になる。   And according to the sensitivity regulation structure 10 of this embodiment provided with the above-mentioned structure, the vertical hole 13 is formed in the ground surface using the annular peripheral wall 14 by the liner plate 12, for example, and the large-scale construction of a foundation part is required. In combination with an efficient and inexpensive seismic isolation structure, it is possible to effectively regulate the seismic isolation device 16 so that the building does not move with a small acceleration due to wind or the like, with a simple configuration. At the same time, when an earthquake occurs, the seismic isolation function of the seismic isolation device 16 can be exhibited smoothly using liquefaction.

すなわち、本実施形態の感度規制構造１０によれば、好ましくは取り扱いが容易な規格品であるライナープレート１２を用いて、確立された従来の工法と同様の簡易な施工方法によって形成された、環状周壁１４と、耐圧底盤１５と、免震装置１６とからなる免震構造と組み合わせて、環状周壁１４の内側に液状化誘発土１９を収容すると共に液状化誘発水２０を貯留するだけの簡易且つ安価な構成によって、地震が発生するまでの間、免震装置１６が作動しないように規制して、風等による小さな加速度では建物が移動しないように容易に制御することが可能になると共に、地震が発生した際には、液状化誘発土１９を液状化させることで、免震装置１６による免震機能をスムーズに発揮させることが可能になる。   That is, according to the sensitivity control structure 10 of the present embodiment, the annular plate formed by a simple construction method similar to the established conventional method, preferably using a liner plate 12 that is a standard product that is easy to handle. In combination with the seismic isolation structure comprising the peripheral wall 14, the pressure-resistant bottom plate 15, and the seismic isolation device 16, the liquefaction inducing soil 19 is accommodated inside the annular peripheral wall 14 and the liquefaction inducing water 20 is simply stored. With an inexpensive configuration, it is possible to control the seismic isolation device 16 so that it does not operate until an earthquake occurs, and it is possible to easily control the building so that it does not move with a small acceleration due to wind or the like. When this occurs, the seismic isolation function of the seismic isolation device 16 can be exhibited smoothly by liquefying the liquefaction induction soil 19.

また、本実施形態によれば、ライナープレート１２は、例えば鋼製の耐久性に優れた部材なので、免震装置１６が設置される縦穴１３を、安定した長期構造物として形成することが可能になる。   Moreover, according to this embodiment, since the liner plate 12 is a member made of, for example, steel, having excellent durability, the vertical hole 13 in which the seismic isolation device 16 is installed can be formed as a stable long-term structure. Become.

なお、本発明は上記実施形態に限定されることなく種々の変更が可能である。例えば、環状周壁は、円形の平面形状を備える円筒形状に形成される必要は必ずしもなく、長円形、矩形等のその他の平面形状を備える筒形状に形成することができる。環状周壁は、ライナープレートを用いて形成される必要は必ずしも無く、施工が容易なその他の合成樹脂製や鋼製の部材を用いて構成することもできる。耐圧底盤の下方の地中に支持杭が打設されていなくても良い。   The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the annular peripheral wall is not necessarily formed in a cylindrical shape having a circular planar shape, and can be formed in a cylindrical shape having other planar shapes such as an oval shape and a rectangular shape. The annular peripheral wall does not necessarily need to be formed using a liner plate, and can be configured using other synthetic resin or steel members that are easy to construct. The support pile may not be placed in the ground below the pressure-resistant bottom plate.

１０ 免震装置の感度規制構造
１１ 住宅建築物（建物）の基礎
１１ａ 基礎スラブ
１１ｂ 立上り部
１２ ライナープレート
１２ａ 周方向フランジ部
１２ｂ 軸方向フランジ部
１３ 縦穴
１４ 環状周壁
１５ 耐圧底盤
１６ 免震装置
１７ 支持杭
１８ 蓋部材
１９ 液状化誘発土
２０ 液状化誘発水
２１ 再攪拌用の水中ポンプ
３０ 免震基礎構造 DESCRIPTION OF SYMBOLS 10 Seismic isolation device sensitivity control structure 11 Foundation (building) foundation 11a Foundation slab 11b Rising part 12 Liner plate 12a Circumferential flange part 12b Axial flange part 13 Vertical hole 14 Annular peripheral wall 15 Pressure-resistant bottom board 16 Seismic isolation apparatus 17 Support Pile 18 Lid member 19 Liquefaction-induced soil 20 Liquefaction-induced water 21 Submersible pump 30 for remixing Seismic isolation structure

Claims (2)

建物の基礎の下面と耐圧底盤との間に介在して設けられて横移動可能に建物を支持する免震装置の感度を規制するための感度規制構造であって、
前記免震装置を中央部分に配置して、前記耐圧底盤から立設して設けられた環状周壁と、前記免震装置と前記環状周壁との間の間隔部分を埋めるようにして、前記環状周壁の内側に収容された液状化誘発土と、前記環状周壁の内側に貯留された液状化誘発水とを含んで構成され、再攪拌用の水中ポンプを備える免震装置の感度規制構造。 A sensitivity regulation structure for regulating the sensitivity of the seismic isolation device that is provided between the lower surface of the foundation of the building and the pressure-resistant bottom plate and supports the building so as to be laterally movable,
The annular peripheral wall is arranged such that the seismic isolation device is arranged in a central portion, and an annular peripheral wall provided upright from the pressure-resistant bottom plate and a gap between the seismic isolation device and the annular peripheral wall are filled. A structure for limiting the sensitivity of a seismic isolation device including a liquefaction-inducing soil accommodated inside the liquefaction-inducing water and a liquefaction-inducing water stored inside the annular peripheral wall, and comprising a submersible pump for re-stirring . 前記環状周壁は、複数のライナープレートを、周方向に環状に接合一体化すると共に複数段に積み重ねて上下方向に接合一体化することで、前記耐圧底盤から立設して設けられている請求項１記載の免震装置の感度規制構造。   The annular peripheral wall is provided to stand up from the pressure-resistant bottom plate by joining and integrating a plurality of liner plates in a ring shape in the circumferential direction and stacking and integrating them in a plurality of stages in a vertical direction. The sensitivity control structure of the seismic isolation device according to 1.
JP2011042760A 2011-02-28 2011-02-28 Seismic isolation device sensitivity control structure Expired - Fee Related JP5769105B2 (en)

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JP3965241B2 (en) * 1998-03-04 2007-08-29 名古屋市 Pipe propulsion method with intermediate shaft leading type
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