JP4852450B2 - Reinforcing method of existing building and reinforcing structure of existing building - Google Patents

Reinforcing method of existing building and reinforcing structure of existing building Download PDF

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JP4852450B2
JP4852450B2 JP2007067455A JP2007067455A JP4852450B2 JP 4852450 B2 JP4852450 B2 JP 4852450B2 JP 2007067455 A JP2007067455 A JP 2007067455A JP 2007067455 A JP2007067455 A JP 2007067455A JP 4852450 B2 JP4852450 B2 JP 4852450B2
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existing building
anchor
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JP2008223430A (en
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正 金子
敏己 須藤
登美夫 森脇
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Obayashi Corp
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Description

本発明は、既存建物の補強方法及び補強構造に関し、特に、既存建物の基礎をアンカーによりアンカーの定着地盤に定着させることにより補強を行う既存建物の補強方法及び既存建物の補強構造に関する。   The present invention relates to a reinforcing method and a reinforcing structure for an existing building, and more particularly, to a reinforcing method for an existing building and a reinforcing structure for an existing building that are reinforced by fixing the foundation of the existing building to an anchoring ground of the anchor with an anchor.

従来より、既存建物の耐震補強方法として、既存建物の外部に鉄骨部材からなるブレース架構を増設する方法が用いられている。かかる耐震補強方法によれば、地震時に既存建物に作用する引抜き力や押込み力に抵抗できる。しかしながら、既存建物の外部にブレース架構を増設するため、建物が密集するような場合には用いることができないという問題があった。
ところで、特許文献１には、基礎杭の内部にアンカーを打設して、基礎杭を引抜き方向に抵抗する抵抗体として機能させることにより、地震力に抵抗できるようにした杭基礎構造が記載されており、この杭基礎構造を耐震補強に適用することが考えられる。
特開平１０―８２０５６号公報 Conventionally, as a seismic reinforcement method for an existing building, a method of adding a brace frame made of a steel frame member to the outside of the existing building has been used. According to this seismic reinforcement method, it is possible to resist the pulling force and pushing force that act on the existing building during an earthquake. However, since a braced frame is added outside the existing building, there is a problem that it cannot be used when the building is crowded.
By the way, Patent Document 1 describes a pile foundation structure that can resist an earthquake force by placing an anchor inside the foundation pile and causing the foundation pile to function as a resistor that resists the pulling direction. It is possible to apply this pile foundation structure to seismic reinforcement.
Japanese Patent Laid-Open No. 10-82056

しかしながら、上記のように耐震補強のためにアンカーを打設する場合には、地震荷重が作用した際にアンカーが伸びることを考慮して、予め緊張力を導入しておくため、基礎構造には鉛直方向荷重に対する十分な耐力が必要とされる。したがって、軟弱の地盤上に構築されたべた基礎を基礎構造とする場合や、杭基礎を有するものの杭基礎が十分な鉛直方向荷重に対する耐力を備えていない場合は、鉛直方向荷重に対する耐力が不足してしまい、アンカーを打設することができない。
また、基礎杭を新たに設けることも考えられるが、既存建物の下方に新たに基礎杭を構築することは難しく、既存建物の補強構造として用いるのには適していない。 However, when anchors are installed for seismic reinforcement as described above, tension is introduced in advance in consideration of the anchor's extension when an earthquake load is applied. Sufficient strength against vertical loads is required. Therefore, when a solid foundation constructed on soft ground is used as the foundation structure, or the pile foundation with a pile foundation does not have sufficient strength against vertical loads, the strength against vertical loads is insufficient. The anchor cannot be placed.
Although it is conceivable to newly provide a foundation pile, it is difficult to construct a foundation pile below the existing building and it is not suitable for use as a reinforcing structure for the existing building.

本発明は、上記の問題に鑑みなされたものであり、その目的は、周囲に建物が密集しているような場合でも施工することができ、かつ、既存建物の下方の地盤が軟弱地盤である場合や、基礎構造の杭が十分な耐力を備えない場合でも適用することのできる既存建物の補強方法及び既存建物の補強構造及びを提供することである。   The present invention has been made in view of the above-mentioned problems, and the object thereof is to enable construction even when buildings are densely packed around, and the ground below the existing building is soft ground. The present invention provides a reinforcing method of an existing building and a reinforcing structure of an existing building that can be applied even when the pile of the foundation structure does not have sufficient proof stress.

上記のような課題を解決するために、本発明は、以下のような手段を採用している。
すなわち、請求項１に係る発明は、既存建物の補強方法であって、前記既存建物の下方の地盤の少なくとも一部をアンカーの定着地盤まで地盤改良する地盤改良工程と、アンカーを、その一端が前記アンカーの定着地盤に定着されるように打設するアンカー打設工程と、前記アンカーの他端を前記既存建物の構造体に定着するアンカー設置工程と、を備えることを特徴とする。 In order to solve the above problems, the present invention employs the following means.
That is, the invention according to claim 1 is a method for reinforcing an existing building, wherein the ground is improved at least part of the ground below the existing building up to the anchoring ground of the anchor, and the anchor has one end thereof. an anchor Da設step of pouring as Ru is fixed to a fixing ground of said anchor, characterized in that it comprises a anchor installation step of fixing the other end of the anchor to a structure of the existing building.

本発明による既存建物の補強方法によれば、地盤改良工程において、既存建物の下方の地盤の少なくとも一部をアンカーの定着地盤まで地盤改良し、アンカー打設工程において、アンカーを、その一端が定着地盤に定着されるように打設し、アンカー設置工程において、アンカーの他端を既存建物の構造体に定着することで、既存建物を補強することができる。 According to the method for reinforcing an existing building according to the present invention, in the ground improvement process, at least a part of the ground below the existing building is improved to the anchor fixing ground, and in the anchor placing process, the anchor is fixed at one end. The existing building can be reinforced by placing it so as to be fixed on the ground and fixing the other end of the anchor to the structure of the existing building in the anchor installation step.

請求項２に係る発明は、請求項１に記載の既存建物の補強方法であって、前記アンカーに緊張力が付与された状態で該アンカーの他端を前記既存建物の構造体に定着することを特徴とする。
本発明による既存建物の補強方法によれば、アンカーに緊張力が付与された状態で、アンカーの他端が既存建物の構造体に定着されることになる。 The invention according to claim 2 is the method for reinforcing an existing building according to claim 1, wherein the other end of the anchor is fixed to the structure of the existing building in a state where tension is applied to the anchor. It is characterized by.
According to the method for reinforcing an existing building according to the present invention, the other end of the anchor is fixed to the structure of the existing building in a state where tension is applied to the anchor.

請求項３に係る発明は、請求項１に記載の既存建物の補強方法であって、前記アンカーに緊張力が付与されない状態で該アンカーの他端を前記既存建物の構造体に定着することを特徴とする。
本発明による既存建物の補強方法によれば、アンカーに緊張力が付与されない状態で、アンカーの他端が既存建物の構造体に定着されることになる。 The invention according to claim 3 is the method for reinforcing an existing building according to claim 1, wherein the other end of the anchor is fixed to the structure of the existing building in a state where no tension is applied to the anchor. Features.
According to the method for reinforcing an existing building according to the present invention, the other end of the anchor is fixed to the structure of the existing building in a state where no tension is applied to the anchor.

請求項４に係る発明は、請求項１から３の何れかに記載の既存建物の補強方法であって、前記アンカーの他端を定着具を介して前記既存建物の構造体に頭部定着することを特徴とする。
本発明による既存建物の補強方法によれば、アンカーの他端は定着具を介して既存建物の構造体に頭部定着されることになる。 The invention according to claim 4 is the method for reinforcing an existing building according to any one of claims 1 to 3, wherein the head of the other end of the anchor is fixed to the structure of the existing building via a fixing tool. It is characterized by that.
According to the method for reinforcing an existing building according to the present invention, the other end of the anchor is fixed to the head of the existing building structure via the fixing tool.

請求項５に係る発明は、請求項１から４の何れかに記載の既存建物の補強方法であって、前記地盤改良工程では、前記既存建物の下部又は基礎に前記地盤まで到達する貫通孔を設け、前記貫通孔より前記既存建物の下方の地盤に地盤改良剤を注入することにより地盤改良することを特徴とする。   The invention which concerns on Claim 5 is the reinforcement method of the existing building in any one of Claim 1 to 4, Comprising: In the said ground improvement process, the through-hole which reaches | attains the said ground to the lower part or foundation of the said existing building is provided. And improving the ground by injecting a ground improver into the ground below the existing building from the through hole.

本発明による既存建物の補強方法によれば、地盤改良工程において、既存建物の下部又は基礎に地盤まで到達する貫通孔を設け、この貫通孔を利用して既存建物の下方の地盤に地盤改良剤を注入することにより、その部分を地盤改良することができる。   According to the method for reinforcing an existing building according to the present invention, in the ground improvement process, a through hole reaching the ground is provided in the lower part or foundation of the existing building, and the ground improving agent is formed on the ground below the existing building using the through hole. The portion can be improved by injecting.

請求項６に係る発明は、請求項５に記載の既存建物の補強方法であって、前記アンカー打設工程では、前記貫通孔を通して前記アンカーを打設することを特徴とする。
本発明による既存建物の補強方法によれば、アンカー打設工程において、貫通孔を利用してアンカーを打設することができる。 The invention according to claim 6 is the method for reinforcing an existing building according to claim 5, wherein, in the anchor placing step, the anchor is placed through the through hole.
According to the method for reinforcing an existing building according to the present invention, an anchor can be placed using a through hole in the anchor placing step.

請求項７に係る発明は、請求項５又は６に記載の既存建物の補強方法であって、前記地盤改良剤はセメント系又はシリカ系であることを特徴とする。
本発明による既存建物の補強方法によれば、セメント系又はシリカ系の地盤改良剤により地盤が改良されることになる。 The invention according to claim 7 is the method for reinforcing an existing building according to claim 5 or 6, wherein the ground improvement agent is cement-based or silica-based.
According to the method for reinforcing an existing building according to the present invention, the ground is improved by a cement-based or silica-based ground improver.

請求項８に係る発明は、請求項１から７の何れかに記載の既存建物の補強方法であって、前記アンカーは永久アンカーであることを特徴とする。   The invention according to claim 8 is the method for reinforcing an existing building according to any one of claims 1 to 7, wherein the anchor is a permanent anchor.

請求項９に係る発明は、既存建物の補強構造であって、前記既存建物の下方の地盤の少なくとも一部をアンカーの定着地盤まで地盤改良することにより構築された地盤改良部と、一端が前記アンカーの定着地盤に定着され、他端が緊張力が付与された状態で又は緊張力が付与されない状態で前記既存建物の構造体に定着されたアンカーと、を備えることを特徴とする。 The invention according to claim 9 is the reinforcing structure of an existing building, the a ground improvement unit at least a portion constructed by ground improvement to the fixing ground anchors of the ground beneath the existing building, one said The anchor is fixed to the anchoring ground of the anchor, and the anchor is fixed to the structure of the existing building in a state where the other end is applied with a tension force or a state where no tension force is applied.

本発明によれば、既存建物の下方の軟弱地盤を地盤改良することで、既存建物が軟弱地盤上に建てられた場合や既存建物の基礎杭が十分な耐力を備えていない場合でも、アンカーに緊張力を付与することができる。これにより、既存建物をアンカーによりアンカーの定着地盤に定着することができ、外部に新たな架構を設けることなく、周囲に建物が密集するような場合であっても、耐震補強を行うことができる。   According to the present invention, by improving the soft ground below the existing building, even if the existing building is built on the soft ground or the foundation pile of the existing building does not have sufficient strength, Tension can be applied. As a result, the existing building can be anchored to the anchor anchorage ground by the anchor, and seismic reinforcement can be performed even in the case where the building is crowded around without providing a new frame outside. .

以下、本発明の既存建物の耐震補強構造の一実施形態について図面を参照しながら説明する。
図１は、既存建物１を本実施形態の耐震補強構造１０で補強した状態を示す図である。同図に示すように、本実施形態の耐震補強構造１０は、例えば軟弱層である地盤３と、この地盤３の下方のアンカーの定着地盤４（例えば、支持層）とを備えた地盤上に構築され、基礎構造としてべた基礎２を有する既存建物１を耐震補強するためのものである。 Hereinafter, an embodiment of the seismic reinforcement structure for an existing building of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a state in which an existing building 1 is reinforced with the earthquake-proof reinforcement structure 10 of the present embodiment. As shown in the figure, the seismic reinforcement structure 10 of the present embodiment is on a ground provided with, for example, a ground 3 that is a soft layer and an anchoring ground 4 (for example, a support layer) of an anchor below the ground 3. It is constructed for seismic reinforcement of an existing building 1 having a solid foundation 2 as a foundation structure.

図１に示すように、本実施形態の耐震補強構造１０は、既存建物１のべた基礎２の下方の地盤３の少なくとも一部を地盤改良することにより形成された地盤改良部３０と、下端が定着地盤４に定着され、緊張力が導入された状態で又は緊張力が導入されない状態で（本実施の形態においては緊張力が導入された状態）上端が既存建物１のべた基礎２に固定された永久アンカー２０とで構成される。   As shown in FIG. 1, the seismic reinforcement structure 10 of the present embodiment has a ground improvement portion 30 formed by ground improvement of at least a part of the ground 3 below the solid foundation 2 of the existing building 1 and a lower end thereof. The upper end is fixed to the solid foundation 2 of the existing building 1 while being fixed to the fixing ground 4 and in a state where tension is introduced or in a state where tension is not introduced (in this embodiment, tension is introduced). And a permanent anchor 20.

地盤改良部３０は、例えば、地盤３を削孔撹拌し、地盤３を削孔撹拌することにより生じた土砂にセメント系又はシリカ系の地盤改良剤を混合撹拌することにより、又は注入することにより構築される。土砂に混合撹拌するセメント系の地盤改良剤としては、恒久グラウトなどの長期耐久性に優れたグラウトが好適である。   For example, the ground improvement unit 30 stirs the ground 3 and mixes or stirs cement-based or silica-based ground improver into the earth and sand produced by the ground stirring of the ground 3 or by injecting it. Built. As the cement-based ground improving agent mixed and stirred in the earth and sand, a grout excellent in long-term durability such as a permanent grout is suitable.

図２は、永久アンカー２０の詳細な構成を示す図であり、（Ａ）は鉛直断面図、（Ｂ）はアンカー自由長部であるＡ−Ａ´断面図、（Ｃ）はアンカー定着長部であるＢ−Ｂ´断面図である。同図に示すように、永久アンカー２０は、掘削孔２９に挿入された、表面に螺旋状の凹凸を有する円筒状のコルゲートシース２１と、コルゲートシース２１内に充填されたインナーグラウト２３と、インナーグラウト２３内に埋設された複数のＰＣ鋼より線２２と、掘削孔２９の内壁とコルゲートシース２１の外周との間に充填されたアウターグラウト２４と、ＰＣ鋼より線２２をべた基礎２に固定する定着具２５と、を備える。また、コルゲートシース２１内には、グラウトを充填するためのグラウトホース２６が挿通されており、インナーグラウト２３に埋め殺しされている。
なお、定着具２５を使用せずに、ＰＣ鋼より線２２をグラウトによりべた基礎２に定着固定してもよい。 2A and 2B are diagrams showing a detailed configuration of the permanent anchor 20, wherein FIG. 2A is a vertical cross-sectional view, FIG. 2B is an AA ′ cross-sectional view that is an anchor free length portion, and FIG. 2C is an anchor fixing length portion. It is BB 'sectional drawing which is. As shown in the figure, the permanent anchor 20 includes a cylindrical corrugated sheath 21 having a spiral unevenness on the surface, inserted into a borehole 29, an inner grout 23 filled in the corrugated sheath 21, and an inner A plurality of PC steel strands 22 embedded in the grout 23, an outer grout 24 filled between the inner wall of the excavation hole 29 and the outer periphery of the corrugated sheath 21, and the PC steel strand 22 are fixed to the solid foundation 2. And a fixing tool 25. Further, a grout hose 26 for filling grout is inserted into the corrugated sheath 21 and is buried in the inner grout 23.
Instead of using the fixing tool 25, the PC steel strand 22 may be fixed and fixed to the solid foundation 2 by grouting.

図２（Ｂ）に示すように、アンカー自由長部のＰＣ鋼より線２２にはアンボンドチューブ２７が囲繞されており、このアンボンドチューブ２７は、ＰＣ鋼より線２２とインナーグラウト２３との付着を妨げている。
これに対して、図２（Ｃ）に示すように、アンカー定着長部のＰＣ鋼より線２２にはアンボンドチューブ２７が囲繞されておらず、ＰＣ鋼より線２２とインナーグラウト２３との間で付着力が確保される。インナーグラウト２３とアウターグラウト２４の間には、コルゲートシース２１が介装されているが、コルゲートシース２１の表面に凹凸が設けられているため、インナーグラウト２３と、周囲の地盤と一体となったアウターグラウト２４との間で力の伝達が行われる。したがって、既存建物１のべた基礎２からＰＣ鋼より線２２に伝達された緊張力は、アンカー定着長部においてインナーグラウト２３及びアウターグラウト２４を介して定着地盤４に伝達され、これにより、この緊張力に抵抗することができる。 As shown in FIG. 2 (B), an unbonded tube 27 is surrounded by the PC steel stranded wire 22 of the anchor free length portion. The unbonded tube 27 adheres the stranded wire 22 and the inner grout 23 to the PC steel stranded wire. Hindering.
On the other hand, as shown in FIG. 2 (C), the unbonded tube 27 is not surrounded by the PC steel strand 22 of the anchor fixing length portion, and between the PC steel strand 22 and the inner grout 23. Adhesion is secured. A corrugated sheath 21 is interposed between the inner grout 23 and the outer grout 24. Since the corrugated sheath 21 has irregularities on the surface, the inner grout 23 and the surrounding ground are integrated. Force is transmitted to and from the outer grout 24. Therefore, the tension transmitted from the solid foundation 2 of the existing building 1 to the PC steel strand 22 is transmitted to the anchorage ground 4 via the inner grout 23 and the outer grout 24 at the anchor anchoring length, and this tension is thereby transmitted. Can resist force.

既存建物１に地震動が発生し、建物の一部に浮き上がり荷重が作用した場合には、永久アンカー２０に緊張力が作用するが、上記のように永久アンカー２０が緊張力に抵抗するため、既存建物１の浮き上がりを防ぐことができる。また、既存建物１の一部に沈み荷重が作用した場合には、地盤改良部３０がこの沈み荷重に抵抗するため、既存建物１の沈み込みを防止できる。このように、本実施形態の耐震補強構造１０によれば、既存建物１に地震などにより荷重が作用した場合であっても、この荷重に対して抵抗することができる。   When seismic motion occurs in the existing building 1 and a lifting load is applied to a part of the building, a tension force acts on the permanent anchor 20, but the permanent anchor 20 resists the tension force as described above. The floating of the building 1 can be prevented. Moreover, when a sinking load acts on a part of the existing building 1, the ground improvement part 30 resists this sinking load, Therefore The sinking of the existing building 1 can be prevented. Thus, according to the seismic reinforcement structure 10 of the present embodiment, even when a load is applied to the existing building 1 due to an earthquake or the like, it is possible to resist the load.

なお、地震時に永久アンカー２０に緊張力が作用した際、ＰＣ鋼より線２２が伸びてしまう虞があるため、ＰＣ鋼より線２２には予め緊張力が導入されている。このため、既存建物１のべた基礎２と定着地盤４との間の地盤３に圧縮荷重が作用するが、上記のように地盤３の少なくとも一部を地盤改良することにより地盤改良部３０としたため、この圧縮荷重に抵抗することができる。
なお、例えば、ＰＣ鋼より線２２の伸び量が小さい場合等には、ＰＣ鋼より線２２に張力を導入しておかなくてもよい。 In addition, when tension | tensile_strength acts on the permanent anchor 20 at the time of an earthquake, there exists a possibility that the wire 22 may extend from PC steel, Therefore The tension | tensile_strength is previously introduced into the strand 22 of PC steel. For this reason, although a compressive load acts on the ground 3 between the solid foundation 2 and the fixed ground 4 of the existing building 1, the ground improvement part 30 is obtained by improving the ground at least a part of the ground 3 as described above. Can resist this compressive load.
For example, when the elongation amount of the wire 22 is smaller than that of the PC steel, it is not necessary to introduce a tension to the wire 22 of the PC steel.

以下、本実施形態の既存建物の耐震補強構造１０を構築する方法を説明する。
図３は、本実施形態の既存建物の耐震補強構造１０を構築する工程を説明するための図である。同図（Ａ）に示すように、まず、既存建物１のべた基礎２にコア抜きを行い、地盤３にまで到達するように貫通孔３１を設ける。
次に、図３（Ｂ）に示すように、べた基礎２に設けられた貫通孔３１より地盤３を削孔撹拌しながら恒久グラウトを注入することにより、べた基礎２の下方の地盤３の少なくとも一部に地盤改良を施し、地盤改良部３０とする。 Hereinafter, a method for constructing the seismic reinforcement structure 10 for an existing building according to the present embodiment will be described.
Drawing 3 is a figure for explaining the process of constructing earthquake proof reinforcement structure 10 of the existing building of this embodiment. As shown in FIG. 1A, first, the solid foundation 2 of the existing building 1 is cored and a through hole 31 is provided so as to reach the ground 3.
Next, as shown in FIG. 3 (B), at least the ground 3 below the solid foundation 2 is injected by injecting permanent grout from the through holes 31 provided in the solid foundation 2 while stirring the ground 3. A part of the ground is improved to form a ground improvement unit 30.

次に、図３（Ｃ）に示すように、べた基礎２に設けられた貫通孔３１より、定着地盤４に永久アンカー２０を打設し、永久アンカー２０の先端を定着地盤４に定着させる。永久アンカー２０は、地盤３を削孔しながら掘削孔の外周面にケーシングを設置し、ケーシング内にＰＣ鋼より線２２が内部に挿通されたコルゲートシース２１を挿入し、グラウトホース２６を通してインナーグラウト２３を注入し、アウターグラウト２４を注入した後、ケーシングを引抜くことにより打設できる。   Next, as shown in FIG. 3C, the permanent anchor 20 is driven on the fixing ground 4 from the through hole 31 provided in the solid foundation 2, and the tip of the permanent anchor 20 is fixed on the fixing ground 4. The permanent anchor 20 has a casing installed on the outer peripheral surface of the excavation hole while drilling the ground 3, a corrugated sheath 21 having a PC steel strand 22 inserted through the casing is inserted into the casing, and an inner grout is passed through the grout hose 26. After injecting 23 and injecting the outer grout 24, the casing can be pulled out.

次に、図３（Ｄ）に示すように、ジャッキなどを用いてＰＣ鋼より線２１に緊張力を付与した状態でＰＣ鋼より線２１に定着具２５を取付け、ＰＣ鋼より線２１の上端をべた基礎２に定着固定する。
以上の工程により既存建物の耐震補強構造１０を構築できる。 Next, as shown in FIG. 3 (D), a fixing tool 25 is attached to the PC steel strand 21 with a tension applied to the PC steel strand 21 using a jack or the like, and the upper end of the PC steel strand 21 is attached. Is fixed and fixed to the solid foundation 2.
The seismic reinforcement structure 10 of the existing building can be constructed by the above process.

本実施形態の補強構造１０によれば、既存建物１の外周に新たにブレース架構を設ける必要がなく、また、既存建物１のべた基礎２に設けた貫通孔より施工することができるため、建物が密集するような場合であっても既存建物１の耐震補強を行うことができる。また、地盤３を地盤改良することにより地盤の圧縮強度が向上するため、予め永久アンカー２０に緊張力を導入することができ、地震動が作用した場合にも永久アンカー２０に伸びが生じてしまうことを防止できる。   According to the reinforcing structure 10 of the present embodiment, it is not necessary to newly provide a brace frame on the outer periphery of the existing building 1 and can be constructed from a through hole provided in the solid foundation 2 of the existing building 1. Even in the case where the buildings are densely packed, the existing building 1 can be seismically strengthened. Moreover, since the compressive strength of the ground is improved by improving the ground 3, tension can be introduced into the permanent anchor 20 in advance, and the permanent anchor 20 is stretched even when earthquake motion is applied. Can be prevented.

なお、本実施形態では、べた基礎２を有する既存建物１に適用した場合について説明したが、これに限らず、杭基礎やフーチング基礎など他の基礎構造を有する既存建物に対しても適用することができる。   In addition, although this embodiment demonstrated the case where it applied to the existing building 1 which has the solid foundation 2, it is applicable not only to this but also to the existing building which has other foundation structures, such as a pile foundation and a footing foundation. Can do.

また、本実施形態では、鉛直方向に永久アンカー２０を打設する場合について説明したが、永久アンカー２０を鉛直方向に打設することができないような場合には、図４に示すように、斜め方向に永久アンカー１２０を打設することも可能である。   In the present embodiment, the case where the permanent anchor 20 is driven in the vertical direction has been described. However, in the case where the permanent anchor 20 cannot be driven in the vertical direction, as shown in FIG. It is also possible to drive the permanent anchor 120 in the direction.

また、本実施形態では、永久アンカー２０としてＶＳＬ−Ｊ１アンカーを用いた場合について説明したが、これに限らず、耐久性の高いアンカーであれば用いることができる。
また、本実施形態では、べた基礎２に貫通孔３１を設け、貫通孔３１より地盤改良及び永久アンカー２０の打設を行ったが、これに限らず、既存建物１の下部に地盤３まで到達するような貫通孔を設け、この貫通孔より地盤改良及び永久アンカー２０の打設を行っても良い。 Moreover, although this embodiment demonstrated the case where a VSL-J1 anchor was used as the permanent anchor 20, not only this but an anchor with high durability can be used.
Moreover, in this embodiment, the through-hole 31 was provided in the solid foundation 2, and the ground improvement and the permanent anchor 20 were placed from the through-hole 31. However, the present invention is not limited to this, and reaches the ground 3 at the lower part of the existing building 1. Such a through hole may be provided, and the ground improvement and the permanent anchor 20 may be placed through the through hole.

既存建物を本実施形態の耐震補強構造で補強した状態を示す図である。It is a figure which shows the state which reinforced the existing building with the earthquake-proof reinforcement structure of this embodiment. 永久アンカーの構成を示す図であり、（Ａ）は鉛直断面図、（Ｂ）はアンカー字油長部であるＡ−Ａ´断面図、（Ｃ）はアンカー定着長部であるＢ−Ｂ´断面図である。It is a figure which shows the structure of a permanent anchor, (A) is a vertical sectional view, (B) is AA 'sectional drawing which is an anchor-shaped oil length part, (C) is BB' which is an anchor fixing length part. It is sectional drawing. 本実施形態の既存建物の耐震補強構造を構築する方法を説明するための図である。It is a figure for demonstrating the method to construct | assemble the earthquake-proof reinforcement structure of the existing building of this embodiment. アンカーを斜め方向に傾斜するように設けた耐震補強構造を示す図である。It is a figure which shows the earthquake-proof reinforcement structure which provided the anchor so that it might incline in the diagonal direction.

符号の説明Explanation of symbols

１ 既存建物
２ べた基礎
３ 地盤
４ 定着地盤
１０ 耐震補強構造
２０、１２０ 永久アンカー
２１ コルゲートシース
２２ ＰＣ鋼より線
２３ インナーグラウト
２４ アウターグラウト
２５ 定着具
２６ グラウト注入ホース
２７ アンボンドチューブ
２９ 掘削孔
３０、１３０ 地盤改良部 DESCRIPTION OF SYMBOLS 1 Existing building 2 Solid foundation 3 Ground 4 Fixed ground 10 Seismic reinforcement structure 20, 120 Permanent anchor 21 Corrugated sheath 22 PC steel strand 23 Inner grout 24 Outer grout 25 Fixing tool 26 Grout injection hose 27 Unbonded tube 29 Drilling holes 30, 130 Ground improvement department

Claims (9)

既存建物の補強方法であって、
前記既存建物の下方の地盤の少なくとも一部をアンカーの定着地盤まで地盤改良する地盤改良工程と、
アンカーを、その一端が前記アンカーの定着地盤に定着されるように打設するアンカー打設工程と、
前記アンカーの他端を前記既存建物の構造体に定着するアンカー設置工程と、
を備えることを特徴とする既存建物の補強方法。 A method of reinforcing an existing building,
A ground improvement step of improving the ground to at least a part of the ground below the existing building to the anchor ground ;
An anchor, an anchor Da設step of one end to pouring as Ru is fixed to a fixing ground of the anchor,
An anchor installation step of fixing the other end of the anchor to the structure of the existing building;
A method of reinforcing an existing building, comprising: 前記アンカーに緊張力が付与された状態で該アンカーの他端を前記既存建物の構造体に定着することを特徴とする請求項１に記載の既存建物の補強方法。   2. The method of reinforcing an existing building according to claim 1, wherein the other end of the anchor is fixed to the structure of the existing building in a state where tension is applied to the anchor. 前記アンカーに緊張力が付与されない状態で該アンカーの他端を前記既存建物の構造体に定着することを特徴とする請求項１に記載の既存建物の補強方法。   The method for reinforcing an existing building according to claim 1, wherein the other end of the anchor is fixed to the structure of the existing building in a state where no tension is applied to the anchor. 前記アンカーの他端を定着具を介して前記既存建物の構造体に頭部定着することを特徴とする請求項１から３の何れかに記載の既存建物の補強方法。   The method of reinforcing an existing building according to any one of claims 1 to 3, wherein the other end of the anchor is fixed to the head of the structure of the existing building via a fixing tool. 前記地盤改良工程では、
前記既存建物の下部又は基礎に前記地盤まで到達する貫通孔を設け、
前記貫通孔より前記既存建物の下方の地盤に地盤改良剤を注入することにより地盤改良することを特徴とする請求項１から４の何れかに記載の既存建物の補強方法。 In the ground improvement process,
Provide a through hole that reaches the ground at the bottom or foundation of the existing building,
The method for reinforcing an existing building according to any one of claims 1 to 4, wherein the ground is improved by injecting a ground improver into the ground below the existing building from the through hole. 前記アンカー打設工程では、
前記貫通孔を通して前記アンカーを打設することを特徴とする請求項５に記載の既存建物の補強方法。 In the anchor placing process,
The method for reinforcing an existing building according to claim 5, wherein the anchor is driven through the through hole. 前記地盤改良剤はセメント系又はシリカ系であることを特徴とする請求項５又は６に記載の既存建物の補強方法。   The method for reinforcing an existing building according to claim 5 or 6, wherein the ground improvement agent is cement-based or silica-based. 前記アンカーは永久アンカーであることを特徴とする請求項１から７の何れかに記載の既存建物の補強方法。   The said anchor is a permanent anchor, The reinforcement method of the existing building in any one of Claim 1 to 7 characterized by the above-mentioned. 既存建物の補強構造であって、
前記既存建物の下方の地盤の少なくとも一部をアンカーの定着地盤まで地盤改良することにより構築された地盤改良部と、
一端が前記アンカーの定着地盤に定着され、他端が緊張力が付与された状態で又は緊張力が付与されない状態で前記既存建物の構造体に定着されたアンカーと、
を備えることを特徴とする既存建物の補強構造。 A reinforcement structure for an existing building,
A ground improvement section constructed by improving the ground to at least a part of the ground below the existing building to the anchorage ground ;
One end is fixed to a fixing ground for the anchor, the anchor and the other end is fixed to the structure of the existing building in a state in which the state or tensioning force tensioning force is applied is not applied,
A reinforcement structure for an existing building, characterized by comprising:
JP2007067455A 2007-03-15 2007-03-15 Reinforcing method of existing building and reinforcing structure of existing building Expired - Fee Related JP4852450B2 (en)

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