JP5382828B2 - Seismic isolation structure - Google Patents

Seismic isolation structure Download PDF

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JP5382828B2
JP5382828B2 JP2012236404A JP2012236404A JP5382828B2 JP 5382828 B2 JP5382828 B2 JP 5382828B2 JP 2012236404 A JP2012236404 A JP 2012236404A JP 2012236404 A JP2012236404 A JP 2012236404A JP 5382828 B2 JP5382828 B2 JP 5382828B2
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seismic isolation
foundation
new
housing
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JP2013015016A (en
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光平 玉村
宗丈 田村
賢仁 二見
寛 加藤
達男 蓑輪
祥之 豊田
達郎 長口
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Taisei Corp
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Description

本発明は、免震化構造に関する。詳しくは、既存基礎と、この既存基礎の上に設けられた既存躯体と、を備える既存建物の免震化構造に関する。   The present invention relates to a seismic isolation structure. Specifically, the present invention relates to a seismic isolation structure of an existing building including an existing foundation and an existing frame provided on the existing foundation.

従来より、既存基礎と、この既存基礎の上に設けられた既存躯体と、を備える既存建物を免震化する方法が知られている。例えば、中央部分から外周部分に向かって、既存基礎の直下に新たな基礎を構築しながら既存基礎を解体し、新たな基礎と既存躯体との間に免震装置を介装する手法が提案されている（特許文献１参照）。   Conventionally, a method for seismic isolation of an existing building including an existing foundation and an existing frame provided on the existing foundation is known. For example, a method has been proposed in which the existing foundation is dismantled while building a new foundation directly under the existing foundation from the center to the outer periphery, and a seismic isolation device is interposed between the new foundation and the existing enclosure. (See Patent Document 1).

特開平１１−３６６０８号公報JP-A-11-36608

ところで、既存建物を免震化するだけでなく、この既存建物の地下空間をさらに有効活用するため、既存建物の直下に新たな地下躯体を構築したい、という要望がある。
しかしながら、既存躯体の直下に新たな地下躯体を構築しようとすると、既存基礎を解体して新たな地下躯体を構築するまでの期間、既存躯体全体を支持することが必要となるが、以上のような手法では、既存躯体全体を支持することができない。 By the way, there is a demand not only to make an existing building base-isolated, but also to build a new underground structure directly under the existing building in order to make more effective use of the underground space of this existing building.
However, when trying to construct a new underground structure directly under the existing structure, it is necessary to support the entire existing structure during the period from dismantling the existing foundation to constructing a new underground structure. This method cannot support the entire existing chassis.

本発明は、既存建物の直下に新設躯体を構築でき、かつ、既存建物を免震化できる免震化構造を提供することを目的とする。   An object of the present invention is to provide a seismic isolation structure capable of constructing a new housing directly under an existing building and capable of isolating the existing building.

請求項１に記載の免震化構造は、既存基礎と、当該既存基礎の上に設けられた既存躯体と、を備える既存建物の免震化構造であって、前記既存建物を挟んで構築された山留壁および／または杭と、前記既存躯体の最下階の天井梁を補強する補強梁と、前記既存躯体の直下でかつ前記既存基礎を前記既存躯体から分離して解体することで形成された空間に構築された新設躯体と、を備え、前記既存躯体は、前記新設躯体と前記既存躯体との間に設置された免震装置を介して前記新設躯体に支持されていることを特徴とする。   The seismic isolation structure according to claim 1 is an existing building seismic isolation structure including an existing foundation and an existing frame provided on the existing foundation, and is constructed across the existing building. Yamagata wall and / or pile, reinforcing beam for reinforcing the ceiling beam on the lowermost floor of the existing frame, and by disassembling the existing foundation directly under the existing frame and separating from the existing frame A new structure built in the space, and the existing structure is supported by the new structure via a seismic isolation device installed between the new structure and the existing structure. And

この発明によれば、既存建物の周囲に山留壁や杭を支持部として構築する。次に、支持部同士の間に既存躯体を貫通して受桁を架け渡し、この受桁に既存躯体を仮支持させる。これにより、既存躯体は、受桁を介して山留壁に支持される。次に、既存基礎を既存躯体から分離して解体し、既存躯体の直下に新設躯体を構築する。次に、新設躯体に既存躯体を仮支持させて、受桁を撤去する。次に、新設躯体と既存躯体との間に免震基礎を構築し、既存躯体を免震基礎に支持させる。
このように、受桁を用いて既存躯体の荷重を支持部に仮支持させておき、この状態で、新設躯体を構築するので、既存建物の直下に新設躯体を構築できる。また、免震装置を介して既存躯体を新設躯体に支持させたので、既存建物を免震化できる。 According to this invention, a mountain retaining wall or a pile is constructed around the existing building as a support portion. Next, the existing girder is passed between the support portions so as to pass over the girder, and the existing girder is temporarily supported by this girder. Thereby, the existing frame is supported by the mountain retaining wall via the receiving girder. Next, the existing foundation is separated from the existing chassis and dismantled, and a new chassis is constructed directly under the existing chassis. Next, the existing frame is temporarily supported by the new frame and the receiving girder is removed. Next, a seismic isolation foundation will be constructed between the new and existing chassis and the existing chassis will be supported by the seismic isolation foundation.
In this way, the load of the existing housing is temporarily supported on the support portion using the receiving girder, and the new housing is constructed in this state, so that the new housing can be constructed directly under the existing building. In addition, the existing building is supported by the new building via the seismic isolation device, so the existing building can be seismically isolated.

本発明によれば、受桁を用いて既存躯体の荷重を支持部に仮支持させておき、この状態で、新設躯体を構築するので、既存建物の直下に新設躯体を構築できる。また、免震装置を介して既存躯体を新設躯体に支持させたので、既存建物を免震化できる。   According to the present invention, the load of the existing housing is temporarily supported on the support portion using the receiving girder, and the new housing is constructed in this state. Therefore, the new housing can be constructed immediately below the existing building. In addition, the existing building is supported by the new building via the seismic isolation device, so the existing building can be seismically isolated.

本発明の一実施形態に係る免震化方法のフローチャートである。It is a flowchart of the seismic isolation method which concerns on one Embodiment of this invention. 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その１）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 1). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その２）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 2). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その３）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 3). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その４）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 4). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その５）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 5). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その６）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 6). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その７）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 7). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その８）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 8). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その９）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 9). 前記実施形態に係る免震化方法により既存建物を免震化する手順を説明するための断面図である（その１０）。It is sectional drawing for demonstrating the procedure to make an existing building seismic isolation by the seismic isolation method which concerns on the said embodiment (the 10).

図１は、本発明の一実施形態に係る免震化方法のフローチャートである。
以下、図１のフローチャートに従って、既存建物１の直下に新設躯体を構築するとともに、既存建物１を免震化する手順について説明する。
ここで、既存建物１は、既存基礎１０と、この既存基礎１０の上に設けられた既存躯体２０と、を備える（図２参照）。
既存基礎１０は、ペデスタル杭１１、耐圧盤１２、基礎梁１３などを含んで構成される。一方、既存躯体２０の最下階つまり既存基礎１０の直上階は、地下１階であり、この既存躯体２０の地下１階部分は、地下１階柱２１、１階梁２２、１階床２３などを含んで構成される。 FIG. 1 is a flowchart of a seismic isolation method according to an embodiment of the present invention.
Hereinafter, according to the flowchart of FIG. 1, a procedure for constructing a new housing immediately below the existing building 1 and making the existing building 1 seismic isolation will be described.
Here, the existing building 1 includes an existing foundation 10 and an existing housing 20 provided on the existing foundation 10 (see FIG. 2).
The existing foundation 10 includes a pedestal pile 11, a pressure platen 12, a foundation beam 13, and the like. On the other hand, the lowest floor of the existing housing 20, that is, the floor directly above the existing foundation 10, is the first basement, and the first basement portion of the existing housing 20 is the first basement column 21, the first floor beam 22, the first floor 23. And so on.

まず、ステップＳ１では、図２に示すように、既存建物１の周囲に、支持部としての山留壁３０および新設杭を構築する。   First, in step S1, as shown in FIG. 2, a mountain retaining wall 30 and a new pile as a support portion are constructed around the existing building 1.

具体的には、既存建物１の近傍（図２中左側）に、山留壁３０を構築する。この山留壁３０は、ＳＭＷ（Ｓｏｉｌ Ｍｉｘｉｎｇ Ｗａｌｌ）壁であり、Ｈ鋼である芯材３１が埋め込まれている。
また、既存建物１の近傍（図２中右側）に、新設する地下躯体のための杭を構築する。この杭には、構真柱３２が挿入されている。
これにより、山留壁３０と構真柱３２とは、既存躯体２０を挟んで配置されることになる。 Specifically, the mountain retaining wall 30 is constructed in the vicinity of the existing building 1 (left side in FIG. 2). This mountain retaining wall 30 is an SMW (Soil Mixing Wall) wall, and a core 31 made of H steel is embedded therein.
In addition, a pile for a newly constructed underground building is constructed in the vicinity of the existing building 1 (right side in FIG. 2). The true pillar 32 is inserted in this pile.
As a result, the mountain retaining wall 30 and the structural pillar 32 are arranged with the existing housing 20 interposed therebetween.

ステップＳ２では、図３に示すように、既存躯体２０の最下階の天井梁つまり１階梁２２を補強する補強梁４０を構築する。   In step S2, as shown in FIG. 3, a reinforcing beam 40 that reinforces the ceiling beam on the lowermost floor of the existing case 20, that is, the first floor beam 22, is constructed.

ステップＳ３では、図３に示すように、構真柱３２の周囲を掘削し、これら構真柱３２同士の間に受桁を支持するための受梁３３を架け渡し、その後、埋め戻しておく。
また、山留壁３０の芯材３１に鉄筋コンクリート造の受桁用基礎３４を構築する。
また、既存躯体２０の最下階の床つまり既存基礎１０の上面に、平滑な移動路盤３５を構築する。具体的には、既存躯体２０の凸部をはつり、凹部にモルタルを流し込んで、この上に鉄板やレールを敷設することで、移動路盤３５を構築する。 In step S3, as shown in FIG. 3, the surroundings of the structural pillars 32 are excavated, the receiving beams 33 for supporting the receiving beams are bridged between the structural pillars 32, and then backfilled. .
Further, a reinforced concrete receiving girder foundation 34 is constructed on the core member 31 of the mountain retaining wall 30.
In addition, a smooth moving roadbed 35 is constructed on the lowermost floor of the existing frame 20, that is, the upper surface of the existing foundation 10. Specifically, the moving roadbed 35 is constructed by holding the projecting portion of the existing housing 20, pouring mortar into the recessed portion, and laying an iron plate or rail on the mortar.

ステップＳ４では、図４および図５に示すように、山留壁３０と杭の構真柱３２との間に既存躯体２０を貫通して受桁５０を架け渡す。
すなわち、図４に示すように、既存建物１の外部にて受桁５０を複数の部材５１に分割しておき、各部材５１を図示しない台車に載せて移動路盤３５上を水平移動させ、既存躯体２０の内部に引き込む。続いて、この引き込んだ部材５１を、図示しないチェーンブロックで吊り上げて、この部材５１の直下の移動路盤３５を撤去する。この作業を繰り返すことにより、各部材５１を所定の位置に配置する。その後、各部材５１の継手部分をボルトで締めて連結する。
これにより、図５に示すように、受桁５０の一端側が受桁用基礎３４に支持され、他端側が受梁３３に支持されて、受桁５０は、既存基礎１０を跨いだ状態となる。 In step S4, as shown in FIGS. 4 and 5, the receiving girder 50 is bridged between the mountain retaining wall 30 and the built-up pillar 32 of the pile through the existing frame 20.
That is, as shown in FIG. 4, the receiving girder 50 is divided into a plurality of members 51 outside the existing building 1, and each member 51 is placed on a cart (not shown) and horizontally moved on the moving roadbed 35. Pull into the housing 20. Subsequently, the drawn member 51 is lifted by a chain block (not shown), and the moving roadbed 35 immediately below the member 51 is removed. By repeating this operation, each member 51 is arranged at a predetermined position. Then, the joint part of each member 51 is tightened and connected with a bolt.
Accordingly, as shown in FIG. 5, one end side of the receiving beam 50 is supported by the receiving beam foundation 34, and the other end side is supported by the receiving beam 33, and the receiving beam 50 is in a state of straddling the existing foundation 10. .

なお、本実施形態では、既存建物１の外部にて受桁５０を複数の部材５１に分割し、各部材５１を別々に既存躯体２０の内部に引き込んだが、これに限らず、既存建物１の外部にて受桁５０を完成させ、受桁５０を一度で既存躯体２０の内部に引き込んでもよい。この場合も、受桁５０の全体をチェーンブロックで吊り上げて、この受桁５０の直下の移動路盤３５を撤去する。   In the present embodiment, the girder 50 is divided into a plurality of members 51 outside the existing building 1, and each member 51 is separately drawn into the existing housing 20. The receiving girder 50 may be completed outside, and the receiving girder 50 may be drawn into the existing housing 20 at a time. Also in this case, the entire receiving beam 50 is lifted by the chain block, and the moving roadbed 35 directly under the receiving beam 50 is removed.

ステップＳ５では、図５に示すように、新設躯体の一部である１階床部分６１を先行して構築し、さらに、この１階床部分６１から既存躯体２０の側面に当接する仮設スラブ６２を構築する。   In step S5, as shown in FIG. 5, the first floor portion 61, which is a part of the new housing, is constructed in advance, and the temporary slab 62 that abuts against the side surface of the existing housing 20 from the first floor portion 61. Build up.

ステップＳ６では、図６に示すように、受桁５０に既存躯体２０を仮支持させる。
具体的には、補強梁４０と受桁５０との間に仮受けジャッキ７０を設置し、図示しない変位計により変位を管理しながらプレロードを導入して、既存躯体２０を受桁５０に支持させる。 In step S6, the existing case 20 is temporarily supported by the receiving girder 50 as shown in FIG.
Specifically, a temporary receiving jack 70 is installed between the reinforcing beam 40 and the receiving girder 50, and a preload is introduced while managing the displacement by a displacement meter (not shown) so that the existing frame 20 is supported by the receiving girder 50. .

ステップＳ７では、図７に示すように、図示しない変位計により変位を管理しながら、ワイヤーソー７１により地下１階柱２１を切断することで、既存基礎１０を既存躯体２０から分離する。   In step S <b> 7, as shown in FIG. 7, the existing foundation 10 is separated from the existing housing 20 by cutting the underground first-floor column 21 with the wire saw 71 while managing the displacement with a displacement meter (not shown).

ステップＳ８では、図８に示すように、掘削を行って、ワイヤーソー７１の切断箇所よりも下の部分を解体する。
ステップＳ９では、図９に示すように、既存躯体２０の直下に新設躯体６０を構築する。 In step S8, as shown in FIG. 8, excavation is performed, and a portion below the cut portion of the wire saw 71 is disassembled.
In step S <b> 9, as shown in FIG. 9, a new housing 60 is constructed immediately below the existing housing 20.

ステップＳ１０では、図１０に示すように、新設躯体６０に既存躯体２０を仮支持させる。
具体的には、新設躯体６０と既存躯体２０との間に仮受けジャッキ７０を設置し、図示しない変位計により変位を管理しながらプレロードを導入して、既存躯体２０を新設躯体８０に支持させる。 In step S10, the existing housing 20 is temporarily supported by the new housing 60 as shown in FIG.
Specifically, a temporary receiving jack 70 is installed between the new housing 60 and the existing housing 20, and a preload is introduced while managing the displacement by a displacement meter (not shown) so that the existing housing 20 is supported by the new housing 80. .

ステップＳ１１では、図１０に示すように、受桁５０を撤去する。
ステップＳ１２では、図１１に示すように、新設躯体６０と既存躯体２０との間に免震装置９２を設置する。
具体的には、新設躯体６０の上に免震下部基礎９０を構築し、既存躯体２０に免震上部基礎９１を構築し、これら免震下部基礎９０と免震上部基礎９１との間に免震装置９２を設置する。
ステップＳ１３では、図１１に示すように、免震装置９２を介して既存躯体２０を新設躯体６０に支持させ、その後、仮受けジャッキ７０を撤去する。 In step S11, as shown in FIG. 10, the receiving girder 50 is removed.
In step S <b> 12, as shown in FIG. 11, the seismic isolation device 92 is installed between the new housing 60 and the existing housing 20.
Specifically, the seismic isolation lower foundation 90 is constructed on the new chassis 60, the seismic isolation upper foundation 91 is constructed on the existing chassis 20, and the seismic isolation lower foundation 90 and the seismic isolation upper foundation 91 are exempted. A seismic device 92 is installed.
In step S13, as shown in FIG. 11, the existing housing 20 is supported on the new housing 60 via the seismic isolation device 92, and then the temporary receiving jack 70 is removed.

本実施形態によれば、以下のような効果がある。
（１）受桁５０を用いて既存躯体２０の荷重を山留壁３０および構真柱３２に仮支持させておき、この状態で、新設躯体６０を構築するので、既存建物１の直下に新設躯体６０を構築できる。また、免震装置９２を介して既存躯体２０を新設躯体６０に支持させたので、既存建物１を免震化できる。 According to this embodiment, there are the following effects.
(1) Since the load of the existing frame 20 is temporarily supported by the retaining wall 30 and the structural pillar 32 using the receiving girder 50, and the new frame 60 is constructed in this state, it is newly installed immediately below the existing building 1. A housing 60 can be constructed. In addition, since the existing housing 20 is supported by the new housing 60 via the seismic isolation device 92, the existing building 1 can be seismically isolated.

（２）新設躯体の一部である１階床部分６１を先行して構築し、さらに、この１階床部分６１から既存躯体２０の側面に当接する仮設スラブ６２を構築したので、この仮設スラブ６２で既存躯体２０の側面を押さえることとなり、既存躯体２０の水平方向のずれを確実に防止できる。   (2) Since the first floor portion 61 that is a part of the newly installed frame is constructed in advance, and the temporary slab 62 that contacts the side surface of the existing housing 20 is constructed from the first floor portion 61, this temporary slab is constructed. The side surface of the existing housing 20 is pressed by 62, and the horizontal displacement of the existing housing 20 can be reliably prevented.

なお、本発明は前記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。   It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

１…既存建物
１０…既存基礎
１１…ペデスタル杭
１２…耐圧盤
１３…基礎梁
２０…既存躯体
２１…地下１階柱
２２…１階梁
２３…１階床
３０…山留壁
３１…芯材
３２…構真柱
３３…受梁
３４…受桁用基礎
３５…移動路盤
４０…補強梁
５０…受桁
５１…部材
６０…新設躯体
６１…１階床部分
６２…仮設スラブ
７０…仮受けジャッキ
７２…ワイヤーソー
９０…免震下部基礎
９１…免震上部基礎
９２…免震装置 DESCRIPTION OF SYMBOLS 1 ... Existing building 10 ... Existing foundation 11 ... Pedestal pile 12 ... Pressure-resistant board 13 ... Foundation beam 20 ... Existing frame 21 ... Basement 1st floor pillar 22 ... 1st floor beam 23 ... 1st floor 30 ... Yamato wall 31 ... Core material 32 ... 構真 pillar 33 ... receiving beam 34 ... 受桁 substructure 35 ... moving roadbed 40 ... reinforcing beams 50 ... 受桁 51 ... member 60 ... new skeleton 61 ... 1 floor portion 62 ... temporary slab 70 ... temporary supporting jacks 72 ... Wire saw 90 ... Base isolation base 91 ... Base isolation base 92 ... Base isolation device

Claims (1)

既存基礎と、当該既存基礎の上に設けられた既存躯体と、を備える既存建物の免震化構造であって、
前記既存建物を挟んで構築された山留壁および／または杭と、
前記既存躯体の最下階の天井梁を補強する補強梁と、
前記既存躯体の直下でかつ前記既存基礎を前記既存躯体から分離して解体することで形成された空間に構築された新設躯体と、を備え、
前記既存躯体は、前記新設躯体と前記既存躯体との間に設置された免震装置を介して前記新設躯体に支持されていることを特徴とする免震化構造。 A seismic isolation structure for an existing building comprising an existing foundation and an existing frame provided on the existing foundation,
A mountain retaining wall and / or pile constructed across the existing building;
A reinforcing beam that reinforces the ceiling beam on the lowest floor of the existing frame;
A new structure constructed directly under the existing structure and in a space formed by separating the existing foundation from the existing structure and disassembling,
The seismic isolation structure, wherein the existing chassis is supported by the new chassis via a seismic isolation device installed between the new chassis and the existing chassis.
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