JP2009155794A - Base isolation construction method - Google Patents

Base isolation construction method Download PDF

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JP2009155794A
JP2009155794A JP2007331390A JP2007331390A JP2009155794A JP 2009155794 A JP2009155794 A JP 2009155794A JP 2007331390 A JP2007331390 A JP 2007331390A JP 2007331390 A JP2007331390 A JP 2007331390A JP 2009155794 A JP2009155794 A JP 2009155794A
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existing building
seismic isolation
existing
retaining wall
mountain retaining
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Keiji Nakanishi
啓二 中西
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation construction method, effective and suitable for achieving the base isolation of an existing building. <P>SOLUTION: This base isolation construction method includes: a process of constructing an earth retaining wall 10 along an existing building 1 as a base-isolation object in the periphery thereof; a process of constructing a base isolation pit 2 in the periphery of the underground part of the existing building and below it while restraining the horizontal displacement of the existing building by a horizontal displacement restraining means 12 installed between the earth retaining wall and the existing building; a process of disposing a reinforcement mat 3 for directly reinforcing the existing foundation by work in the base isolation pit and driving a pile 13 into the lower ground of the base isolation pit to temporarily support the existing building through the reinforcement mat; and a process of disposing a batholith as a new foundation at the bottom in the base isolation pit, interposing a base isolation device between the batholith and the reinforcement mat, and then releasing temporary support of the pile to support the existing building through the reinforcement mat using the base isolation device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は既存建物を免震化するための工法に関する。   The present invention relates to a method for isolating existing buildings.

既存建物を免震化するためのいわゆる免震レトロフィット工法として、たとえば特許文献1に示されるものが提案されている。
これはべた基礎の既存建物を対象とするもので、既存建物の直下の地盤を掘削して深礎工法による杭体を施工し、杭体とべた基礎との間に介装したサポートにより既存建物を仮支持した状態で免震ピットを施工し、免震ピットの底部に底盤を新設してその底盤と既存のべた基礎との間に免震装置を介装するというものである。
特開2003−253911号公報
As a so-called seismic isolation retrofit method for isolating an existing building, for example, the one disclosed in Patent Document 1 has been proposed.
This is intended for existing buildings with solid foundations, and the foundations under the existing buildings are excavated to construct pile bodies by the deep foundation method, and the existing buildings are installed with support interposed between the pile bodies and the solid foundations. The seismic isolation pit is constructed in a state where it is temporarily supported, and a bottom base is newly installed at the bottom of the base isolation pit, and a base isolation device is interposed between the bottom base and the existing solid foundation.
JP 2003-253911 A

上記従来の免震化工法は比較的小規模かつ簡易な構造の既存建物を対象とする免震化手法として有効であると考えられるが、施工中の地震発生等の事態を想定すると必ずしも施工安全性を確保できないし、また既存建物を使用しながら免震化するようなことも望めないことから、それを可能とするより有効適切な免震化工法の開発も望まれている。   The conventional seismic isolation method described above is considered to be effective as a seismic isolation method for existing buildings with a relatively small and simple structure. Therefore, it is not possible to secure seismic isolation while using existing buildings, so it is desirable to develop a more effective and appropriate seismic isolation method.

本発明は基礎の構造が直接基礎とされている既存建物を対象とする免震化工法であって、免震化対象の既存建物の周囲に沿って該既存建物を取り囲む山留壁を構築する工程と、該山留壁と前記既存建物との間に設置した水平変位拘束手段によって該既存建物の水平変位を拘束しつつ、該既存建物と前記山留壁との間の地盤を直接基礎の下方に達する深度まで掘削するとともに該直接基礎の下方地盤を掘削して、既存建物の地下部の周囲および下部に免震ピットを施工する工程と、該免震ピット内での作業により、既存の直接基礎を補強する補強マットを設けるとともに、該免震ピットの下方地盤に杭を打ち込んで該杭により前記補強マットを介して既存建物を仮支持する工程と、前記免震ピット内の底部に新設基礎としての底盤を設けて、該底盤と前記補強マットとの間に免震装置を介装した後、前記杭による仮支持を解いて前記免震装置により前記補強マットを介して既存建物を支持する工程とを有することを特徴とする。   The present invention is a seismic isolation method for an existing building whose foundation structure is directly based, and constructs a mountain wall surrounding the existing building along the periphery of the existing building to be seismically isolated The ground between the existing building and the mountain wall is directly grounded while restraining the horizontal displacement of the existing building by a horizontal displacement restraint means installed between the mountain wall and the existing building. By excavating to the depth that reaches the bottom and excavating the lower ground of the direct foundation and constructing seismic isolation pits around and below the underground part of the existing building, and work in the seismic isolation pit, A step of providing a reinforcing mat for directly reinforcing the foundation, driving a pile into the lower ground of the seismic isolation pit, and temporarily supporting the existing building via the reinforcing mat by the pile, and a new installation at the bottom of the seismic isolation pit Providing a base as a foundation A step of interposing a seismic isolation device between the board and the reinforcing mat, and then releasing a temporary support by the pile and supporting the existing building by the seismic isolation device via the reinforcing mat. To do.

本発明においては、近接配置されている複数の既存建物からなる既存建物群を対象として、該既存建物群全体の地下部の周囲および下部に前記免震ピットを設けるとともに、各既存建物の直接基礎を補強する補強マットを該既存建物群の全体を一括して補強するように一体に設けることも可能である。   In the present invention, for the existing building group consisting of a plurality of existing buildings arranged in proximity, the seismic isolation pits are provided around and under the basement of the entire existing building group, and the direct foundation of each existing building is provided. It is also possible to integrally provide a reinforcing mat that reinforces the existing building group so as to reinforce the entire existing building group.

また、必要に応じて、前記山留壁の外側に、該山留壁を取り囲む環状の外郭山留壁を設けることも考えられる。   It is also conceivable that an annular outer mountain retaining wall surrounding the mountain retaining wall is provided outside the mountain retaining wall as necessary.

さらに、前記免震ピットを水槽として機能せしめてその貯留水により前記既存建物に浮力を作用させて前記免震装置による支持荷重を低減せしめることも可能である。   Furthermore, it is possible to make the seismic isolation pit function as a water tank so that the stored load causes buoyancy to act on the existing building to reduce the support load by the seismic isolation device.

本発明の免震化工法によれば、既存建物やその内部設置機器類に対する耐震補強を行うことなく既存建物に対する優れた免震効果が得られて、既存建物に対する耐震性能を大きく向上させることができることはもとより、免震ピットを構築するに際しては既存建物の周囲を取り囲むように山留壁を設けてその山留壁と既存建物との間に水平変位拘束手段を設けるので、施工中に万一地震が発生しても既存建物に過大な水平変位が生じることを有効に防止でき、したがって施工安全性を充分に確保できるのみならず既存建物やその内部設置機器類に地震被害が及ぶこともなく、それ故に既存建物を使用しながら免震化することも可能であり、たとえば原子力発電所等を対象とする免震化工法として最適である。   According to the seismic isolation method of the present invention, it is possible to obtain an excellent seismic isolation effect for an existing building without performing seismic reinforcement for the existing building and its installed equipment, and greatly improve the seismic performance for the existing building. In addition to what can be done, when constructing a seismic isolation pit, a mountain retaining wall is provided to surround the existing building and a horizontal displacement restraint is provided between the mountain retaining wall and the existing building. Even if an earthquake occurs, it is possible to effectively prevent the occurrence of excessive horizontal displacement in the existing building, so that not only the construction safety can be secured sufficiently, but the existing building and its installed equipment are not damaged by the earthquake. Therefore, it is possible to make the base isolation while using an existing building, which is optimal as a base isolation method for a nuclear power plant, for example.

特に、複数の既存建物が近接配置されている既存建物群を対象とする場合には、各既存建物の直接基礎の全体を頑強な補強マットにより一体化したうえでその全体を免震装置により一括して免震支持することにより、既存建物群の全体を効率的に免震化することができるし、各既存建物をそれぞれ独立に免震化する場合には必要となる各既存建物間の相対水平変位を考慮しなくて済む。   In particular, when targeting a group of existing buildings in which multiple existing buildings are closely arranged, the entire direct foundation of each existing building is integrated with a robust reinforcement mat, and then the entire building is integrated with a seismic isolation device. As a result, the entire existing building group can be efficiently seismically isolated, and if each existing building is isolated independently, the relative relationship between the existing buildings is required. It is not necessary to consider the horizontal displacement.

また、山留壁の外側にさらに環状の外郭山留壁を構築すれば、その外郭山留壁によって土圧に対して有効に抵抗できるのでより万全の施工安全性を確保し得る。   Further, if an annular outer mountain retaining wall is constructed outside the mountain retaining wall, the outer mountain retaining wall can effectively resist the earth pressure, so that the construction safety can be ensured.

さらに、免震ピットを水槽として機能せしめて貯留水による浮力を利用するいわゆる浮体式免震とすることにより、免震装置による支持荷重を低減させることができるし、貯留水による減衰効果を期待することも可能である。   Furthermore, by making the seismic isolation pit function as a water tank and using the so-called floating-type seismic isolation system that uses the buoyancy of the stored water, the support load by the seismic isolation device can be reduced, and the damping effect by the stored water is expected It is also possible.

本発明の免震化工法を既存の原子力発電所を対象としてそれを免震化する場合に適用するための一実施形態を図1〜図6を参照して説明する。
本実施形態において免震化対象としている原子力発電所は、図1に示すように多数の既存建物1が近接配置されている既存建物群Aからなり、かつ個々の既存建物1の基礎はいずれも直接基礎からなるものであり、本実施形態では最終的に図6に示すようにそれら既存建物群Aの全体を一括して免震化するべく、既存建物群Aの全体の地下部の周囲および下部に免震ピット2を設けるとともに、各既存建物1の既存の直接基礎どうしを一体に連結する頑強な補強マット3と、既存建物群A全体に対する新たな基礎としての底盤4を設けて、それら補強マット3と底盤4との間に設置した積層ゴム等の免震装置5によって既存建物群A全体を免震支持することを主眼とするものである。
An embodiment for applying the seismic isolation method of the present invention to an existing nuclear power plant for seismic isolation will be described with reference to FIGS.
As shown in FIG. 1, the nuclear power plant that is subject to seismic isolation in this embodiment is composed of an existing building group A in which a large number of existing buildings 1 are arranged close to each other, and the foundations of the individual existing buildings 1 are all In this embodiment, as shown in FIG. 6, in order to make the entire existing building group A seismically isolated as a whole, in this embodiment, In addition to the seismic isolation pit 2 at the bottom, a robust reinforcement mat 3 that connects the existing direct foundations of each existing building 1 together, and a base 4 as a new foundation for the entire existing building group A, The main purpose is to support the entire existing building group A with a seismic isolation device 5 such as a laminated rubber installed between the reinforcing mat 3 and the bottom panel 4.

本実施形態では、まず図2に示すように既存建物群A全体を取り囲む山留壁10を構築する。山留壁10は既存建物群A全体の外形輪郭に沿う形状に構築するが、山留壁10と既存建物1の外周部との間の間隔はそこに所望の免震クリアランスを確保し、かつその間隔を通して既存建物群Aの周囲および下方の地盤を掘削し得る程度に設定する。
本実施形態における山留壁10の構造やその構築工法は任意であるが、いずれにしてもその内部を掘削するに際して充分な山留め機能を有するものであることに加え、後述する水平変位拘束手段12とともに施工途中における既存建物1の水平変位を拘束し得るものであることが必要であり、したがって山留壁10の構造としてはたとえば地中連続壁によるものが好適に採用可能である。
なお、本実施形態では上記の山留壁10の外側にさらに環状の外郭山留壁11を構築するとともに、それら山留壁10と外郭山留壁11とを要所で連結していて、主として外側の外郭山留壁11によって土圧に抵抗し、内側の山留壁10によって掘削時の山留機能と既存建物1に対する水平変位拘束機能を確保するものとしており、それにより施工中における万一の地震発生時にも充分なる安全性を確保し得るものとなっている。なお、外郭山留壁11の構造も任意であるが、地中連続壁によることが好ましい。
In this embodiment, first, as shown in FIG. 2, the mountain retaining wall 10 surrounding the entire existing building group A is constructed. The mountain retaining wall 10 is constructed in a shape that conforms to the outline of the entire existing building group A, but the interval between the mountain retaining wall 10 and the outer periphery of the existing building 1 ensures a desired seismic isolation clearance, and It is set to such an extent that the ground around and below the existing building group A can be excavated through the interval.
The structure of the retaining wall 10 and its construction method in the present embodiment are arbitrary, but in any case, in addition to having a sufficient retaining function when excavating the inside, the horizontal displacement restraining means 12 described later. At the same time, it is necessary to be able to restrain the horizontal displacement of the existing building 1 during the construction. Therefore, as the structure of the mountain retaining wall 10, for example, an underground wall can be suitably used.
In the present embodiment, an annular outer mountain retaining wall 11 is further constructed outside the mountain retaining wall 10, and the mountain retaining wall 10 and the outer mountain retaining wall 11 are connected at important points. The outer outer mountain retaining wall 11 resists earth pressure, and the inner mountain retaining wall 10 secures the mountain retaining function at the time of excavation and the horizontal displacement restraining function for the existing building 1, so that in the event of construction It is possible to ensure sufficient safety even in the event of an earthquake. In addition, although the structure of the outer mountain retaining wall 11 is also arbitrary, it is preferably an underground continuous wall.

次に、図3に示すように山留壁10と既存建物1との間を直接基礎の深度に達するまで掘削していき、さらに図4に示すように既存建物1の下方地盤を水平方向に掘削していって、既存建物群A全体の地下部の周囲に免震ピット2を構築していく。
その際、図3に示すように山留壁10と既存建物1との間に水平変位拘束手段12としての切梁あるいは仮設床等を多段に設置していく。これにより、山留壁10による山留機能を万全に確保するとともに、施工中に万一地震が発生した際にも既存建物1の水平変位を水平変位拘束手段12と山留壁10とによって確実に拘束可能であり、したがって施工安全性を確保し得ることはもとより既存建物1やその内部設置機器類に対する地震被害を有効に防止することができる。
Next, as shown in FIG. 3, excavation is performed directly between the mountain retaining wall 10 and the existing building 1 until reaching the depth of the foundation, and further, the lower ground of the existing building 1 is horizontally oriented as shown in FIG. Excavating and building seismic isolation pit 2 around the basement of the entire existing building group A.
At that time, as shown in FIG. 3, a cut beam or a temporary floor as the horizontal displacement restraining means 12 is installed in multiple stages between the mountain retaining wall 10 and the existing building 1. As a result, the mountain retaining function by the mountain retaining wall 10 is fully secured, and the horizontal displacement of the existing building 1 can be reliably ensured by the horizontal displacement restraining means 12 and the mountain retaining wall 10 even in the event of an earthquake during construction. Therefore, it is possible to effectively prevent earthquake damage to the existing building 1 and its internally installed devices as well as ensuring construction safety.

また、図4に示すように既存建物1の下方地盤を水平方向に掘削していって免震ピット2を構築していく際には、免震ピット2内での作業により既存の直接基礎を補強する補強マット3を施工していき、かつ免震ピット2の下方地盤には杭13を打ち込んでいってその杭13により補強マット3を介して既存建物1を仮支持していく。
補強マット3は単に個々の既存建物1の直接基礎を補強するのみならず、各既存建物1の直接基礎どうしを一体に連結して既存建物群A全体を一括して支持するためのものであり、したがってその構造は頑強な鉄筋コンクリート造とすれば良い。
また、杭13の施工は免震ピット2の高さの範囲内で行う必要があり、したがって長尺の杭体の施工は困難であるので、杭13の施工法としては短尺の鋼管杭を免震ピット2内で順次接続しながら地盤中に圧入していく鋼管杭圧入工法が好適に採用可能である。
As shown in FIG. 4, when the seismic isolation pit 2 is constructed by excavating the lower ground of the existing building 1 in the horizontal direction, the existing direct foundation is The reinforcement mat 3 to be reinforced is constructed, and a pile 13 is driven into the lower ground of the seismic isolation pit 2, and the existing building 1 is temporarily supported by the pile 13 through the reinforcement mat 3.
The reinforcing mat 3 not only reinforces the direct foundation of each existing building 1 but also connects the direct foundations of the existing buildings 1 together to support the existing building group A as a whole. Therefore, the structure may be a reinforced concrete structure.
In addition, the construction of the pile 13 needs to be carried out within the range of the height of the seismic isolation pit 2, and therefore construction of a long pile body is difficult. The steel pipe pile press-in method that press-fits into the ground while sequentially connecting in the seismic pit 2 can be suitably employed.

以上の工程により免震ピット2を構築するとともに、その上部において既存建物群Aの全体を一括して支持する補強マット3の全体を構築し、かつ免震ピット2の下方地盤全体に杭13を施工することにより、それらの杭13により補強マット3を介して既存建物群A全体を仮支持する。
しかる後に、あるいは上記の工程と並行して、図5に示すように免震ピット2の底面全体に既存建物群A全体に対する新たな基礎としての頑強な鉄筋コンクリート造の底盤4を施工する。
The seismic isolation pit 2 is constructed by the above process, and the entire reinforcing mat 3 that supports the entire existing building group A is constructed at the upper part of the seismic isolation pit 2. By constructing, the entire existing building group A is temporarily supported by the piles 13 via the reinforcing mat 3.
After that, or in parallel with the above-described process, a reinforced concrete base 4 is constructed on the entire bottom surface of the seismic isolation pit 2 as a new foundation for the entire existing building group A as shown in FIG.

図6に示すように底盤4と補強マット3との間に積層ゴム等の免震装置5を配置し、最終的に杭13による仮支持を解いて杭頭部を撤去することにより、既存建物群Aの全体を免震装置5により免震支持し、水平拘束手段12を撤去すれば免震化工程の完了となる。
なお、図6に鎖線で示しているように復水ピット14を設ける必要がある場合には、それを底盤4下に設ければ良く、その施工は底盤4の施工に際して同時に行えば良い。
As shown in FIG. 6, the seismic isolation device 5 such as laminated rubber is arranged between the bottom plate 4 and the reinforcing mat 3, and finally the pile head 13 is removed by removing the temporary support by the pile 13 so that the existing building is removed. If the entire group A is seismically isolated by the seismic isolation device 5 and the horizontal restraining means 12 is removed, the seismic isolation process is completed.
In addition, when it is necessary to provide the condensate pit 14 as shown by a chain line in FIG. 6, it may be provided below the bottom board 4, and the construction may be performed simultaneously with the construction of the bottom board 4.

上記実施形態の免震化工法によれば、既存建物1やその内部設置機器類に対する耐震補強を行うことなく、また既存建物内からの作業を一切必要とせずに外部での作業のみで原子力発電所全体を免震化することができ、地震に対する施設安全性を大きく向上させることができる。
特に、免震ピット2を構築するに際しては既存建物群A全体の周囲を取り囲むように山留壁10を設けるばかりでなく、その山留壁10と既存建物1との間に水平変位拘束手段12を設けるので、施工中に万一地震が発生しても既存建物1の過度の水平変位が生じることを有効に防止でき、したがって施工安全性を充分に確保できるのみならず既存建物1やその内部設置機器類に地震被害が及ぶこともなく、それ故に原子力発電所を稼働しながら免震化することも可能である。
According to the seismic isolation method of the above embodiment, nuclear power generation can be performed only by external work without performing seismic reinforcement for the existing building 1 and its internal equipment, and without any work from inside the existing building. The entire site can be seismically isolated, greatly improving facility safety against earthquakes.
In particular, when the seismic isolation pit 2 is constructed, not only the mountain retaining wall 10 is provided so as to surround the entire existing building group A, but also the horizontal displacement restraining means 12 between the mountain retaining wall 10 and the existing building 1. Therefore, even if an earthquake occurs during construction, it is possible to effectively prevent an excessive horizontal displacement of the existing building 1, so that not only the construction safety can be sufficiently secured but also the existing building 1 and its interior There is no earthquake damage to the installed equipment, so it is possible to make seismic isolation while operating the nuclear power plant.

また、既存建物1の直接基礎の全体を頑強な補強マット3により一体化したうえでその全体を免震装置5により一括して免震支持するので、既存の原子力発電所全体を効率的に免震化することができるし、各既存建物1をそれぞれ独立に免震化する場合には必要となる各既存建物間の相対水平変位を考慮しなくて済み、各建物間に跨る配管類に免震継手を設ける必要もない。   In addition, since the entire direct foundation of the existing building 1 is integrated with the robust reinforcement mat 3 and the whole is seismically isolated and supported by the seismic isolation device 5, the entire existing nuclear power plant is efficiently exempted. It can be seismicized, and when each existing building 1 is isolated independently, it is not necessary to consider the relative horizontal displacement between each existing building, and it is exempted from the piping straddling between each building. There is no need to install seismic couplings.

以上で本発明の一実施形態を説明したが、上記実施形態はあくまで好適な一例であって本発明は上記実施形態に限定されるものでは勿論なく、たとえば以下に列挙するような様々な応用や変形が可能である。
上記実施形態は既存の原子力発電所を免震化する場合の適用例であるが、本発明は原子力発電所に限らず様々な用途、規模、形態の既存建物全般に広く適用できるものである。
また、上記実施形態では近接配置されている複数の既存建物1を対象として各既存建物1を連結マット3により一体に連結したうえでその補強マット3を介して既存建物群A全体を一括して免震支持することとしたが、本発明はそのような場合に限らず独立に構築されている単一の既存建物のみを対象として免震化する場合にも当然に適用可能である。
Although one embodiment of the present invention has been described above, the above embodiment is merely a preferred example, and the present invention is not limited to the above embodiment. For example, various applications and Deformation is possible.
The above embodiment is an application example in the case of seismic isolation of an existing nuclear power plant, but the present invention is not limited to the nuclear power plant and can be widely applied to existing buildings of various uses, scales, and forms.
Moreover, in the said embodiment, after connecting each existing building 1 integrally with the connection mat 3 for the several existing building 1 arrange | positioned closely, the whole existing building group A is collectively put together via the reinforcement mat 3 Although the seismic isolation support is provided, the present invention is not limited to such a case, and can naturally be applied to a case where the seismic isolation is applied only to a single existing building that is independently constructed.

また、本発明の免震化工法によりいわゆる浮体式免震とすることも可能である。すなわち、図7に示すように上記実施形態における免震ピット2を水槽として機能せしめて、免震ピット2内の貯留水による浮力を既存建物1に作用させることにより、免震装置5による支持荷重を低減させることができるし、貯留水による減衰効果を期待することも可能である。   Moreover, it is also possible to make it a so-called floating type seismic isolation by the seismic isolation method of the present invention. That is, as shown in FIG. 7, the seismic isolation pit 2 in the above embodiment functions as a water tank, and the buoyancy caused by the stored water in the seismic isolation pit 2 is applied to the existing building 1, thereby supporting load by the seismic isolation device 5. In addition, it is possible to expect a damping effect due to stored water.

さらに、上記実施形態のように山留壁10の外側にさらに環状の外郭山留壁11を設けることが好ましいが、地盤状況によっては外郭山留壁11は省略しても差し支えないし、、あるいはそのような環状の外郭山留壁11の設置スペースを確保できないような場合にはそれに代えてたとえば図8に示すように山留壁10をアースアンカー15により支持することも考えられる。   Further, it is preferable to further provide an annular outer mountain retaining wall 11 outside the mountain retaining wall 10 as in the above embodiment, but the outer mountain retaining wall 11 may be omitted depending on the ground conditions, or the In the case where the installation space for the annular outer mountain retaining wall 11 cannot be secured, it is conceivable that the mountain retaining wall 10 is supported by a ground anchor 15 instead, for example, as shown in FIG.

本発明の免震化工法の一実施形態を示すもので、免震化対象の既存建物群としての原子力発電所を示す図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the seismic isolation method of the present invention, and is a diagram showing a nuclear power plant as an existing building group to be seismically isolated. 同、山留壁および外郭山留壁を構築した状態を示す図である。It is a figure which shows the state which constructed | assembled the mountain retaining wall and the outer contour mountain retaining wall. 同、免震ピットを施工している状態を示す図である。It is a figure which shows the state which is constructing the seismic isolation pit. 同、免震ピットを施工しつつ補強マットと杭を施工している状態を示す図である。It is a figure which shows the state which is constructing the reinforcement mat and the pile while constructing the seismic isolation pit. 同、免震ピット、補強マット、杭、底盤の施工が完了した状態を示す図である。It is a figure which shows the state which the construction of the seismic isolation pit, the reinforcement mat, the pile, and the bottom panel was completed. 同、免震化が完了した状態を示す図である。It is a figure which shows the state which seismic isolation was completed as well. 同、変形例を示すもので、浮体式免震とする場合の例を示す図である。It shows a modification and shows an example in the case of floating body seismic isolation. 同、他の変形例を示すもので、環状の外郭山留壁を省略して山留壁をアースアンカーにより支持する場合の例を示す図である。FIG. 11 is a diagram showing another modification, and showing an example in which an annular outer mountain retaining wall is omitted and the mountain retaining wall is supported by a ground anchor.

符号の説明Explanation of symbols

A 既存建物群
1 既存建物
2 免震ピット
3 補強マット
4 底盤
5 免震装置
10 山留壁
11 外郭山留壁
12 水平変位拘束手段
13 杭
14 復水ピット
15 アースアンカー
A existing building group 1 existing building 2 seismic isolation pit 3 reinforcement mat 4 bottom 5 seismic isolation device 10 mountain retaining wall 11 outer wall retaining wall 12 horizontal displacement restraint means 13 pile 14 condensate pit 15 earth anchor

Claims (4)

基礎の構造が直接基礎とされている既存建物を対象とする免震化工法であって、
免震化対象の既存建物の周囲に沿って該既存建物を取り囲む山留壁を構築する工程と、
該山留壁と前記既存建物との間に設置した水平変位拘束手段によって該既存建物の水平変位を拘束しつつ、該既存建物と前記山留壁との間の地盤を直接基礎の下方に達する深度まで掘削するとともに該直接基礎の下方地盤を掘削して、既存建物の地下部の周囲および下部に免震ピットを施工する工程と、
該免震ピット内での作業により、既存の直接基礎を補強する補強マットを設けるとともに、該免震ピットの下方地盤に杭を打ち込んで該杭により前記補強マットを介して既存建物を仮支持する工程と、
前記免震ピット内の底部に新設基礎としての底盤を設けて、該底盤と前記補強マットとの間に免震装置を介装した後、前記杭による仮支持を解いて前記免震装置により前記補強マットを介して既存建物を支持する工程とを有することを特徴とする免震化工法。
It is a seismic isolation method for existing buildings whose foundation structure is directly based,
Constructing a mountain retaining wall surrounding the existing building along the periphery of the existing building to be seismically isolated;
The ground displacement between the existing building and the mountain retaining wall reaches directly below the foundation while restraining the horizontal displacement of the existing building by the horizontal displacement restraining means installed between the mountain retaining wall and the existing building. Excavating to the depth and excavating the lower ground of the direct foundation to construct seismic isolation pits around and below the basement of the existing building;
A reinforcement mat that reinforces the existing direct foundation is provided by work in the seismic isolation pit, and a pile is driven into the lower ground of the seismic isolation pit and the existing building is temporarily supported by the pile via the reinforcement mat. Process,
After providing a base as a new foundation at the bottom of the seismic isolation pit and interposing a base isolation device between the base and the reinforcing mat, the temporary support by the pile is released and the base isolation device And a process for supporting an existing building through a reinforcing mat.
請求項1記載の免震化工法であって、
近接配置されている複数の既存建物からなる既存建物群を対象として、該既存建物群全体の地下部の周囲および下部に前記免震ピットを設けるとともに、各既存建物の直接基礎を補強する補強マットを該既存建物群の全体を一括して補強するように一体に設けることを特徴とする免震化工法。
The seismic isolation method according to claim 1,
Reinforcement mat for reinforcing existing foundations for the existing building group consisting of a plurality of existing buildings arranged in the vicinity and providing the seismic isolation pits around and below the basement of the entire existing building group and reinforcing the direct foundation of each existing building A seismic isolation method characterized in that the existing building group is integrally provided so as to reinforce the entire existing building group.
請求項1または2記載の免震化工法であって、
前記山留壁の外側に、該山留壁を取り囲む環状の外郭山留壁を設けることを特徴とする免震化工法。
The seismic isolation method according to claim 1 or 2,
A seismic isolation method characterized in that an annular outer mountain retaining wall surrounding the mountain retaining wall is provided outside the mountain retaining wall.
請求項1,2または3記載の免震化工法であって、
前記免震ピットを水槽として機能せしめてその貯留水により前記既存建物に浮力を作用させて前記免震装置による支持荷重を低減せしめることを特徴とする免震化工法。
The seismic isolation method according to claim 1, 2 or 3,
A seismic isolation method characterized in that the seismic isolation pit is caused to function as a water tank, and the stored load causes buoyancy to act on the existing building to reduce the support load by the seismic isolation device.
JP2007331390A 2007-12-25 2007-12-25 Base isolation construction method Pending JP2009155794A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5397212A (en) * 1977-02-04 1978-08-25 Kumagai Gumi Co Ltd Method of double retaining by plurality of anchor steps
JP2000282695A (en) * 1999-03-31 2000-10-10 Shimizu Corp Bas isolation construction method for existing building
JP2001049891A (en) * 1999-08-05 2001-02-20 Shimizu Corp Construction of vibration isolation and vibration isolation construction method
JP2001241202A (en) * 2000-02-25 2001-09-04 Toshiba Corp Community symbiosis plant
JP2006002428A (en) * 2004-06-17 2006-01-05 Shimizu Corp Reinforcing method of existing floor and base isolation method of existing building
JP2007239803A (en) * 2006-03-06 2007-09-20 Shimizu Corp Floating body type seismic isolation structure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5397212A (en) * 1977-02-04 1978-08-25 Kumagai Gumi Co Ltd Method of double retaining by plurality of anchor steps
JP2000282695A (en) * 1999-03-31 2000-10-10 Shimizu Corp Bas isolation construction method for existing building
JP2001049891A (en) * 1999-08-05 2001-02-20 Shimizu Corp Construction of vibration isolation and vibration isolation construction method
JP2001241202A (en) * 2000-02-25 2001-09-04 Toshiba Corp Community symbiosis plant
JP2006002428A (en) * 2004-06-17 2006-01-05 Shimizu Corp Reinforcing method of existing floor and base isolation method of existing building
JP2007239803A (en) * 2006-03-06 2007-09-20 Shimizu Corp Floating body type seismic isolation structure

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