JP2010001611A - Seismic strengthening method for existing building - Google Patents

Seismic strengthening method for existing building Download PDF

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JP2010001611A
JP2010001611A JP2008159199A JP2008159199A JP2010001611A JP 2010001611 A JP2010001611 A JP 2010001611A JP 2008159199 A JP2008159199 A JP 2008159199A JP 2008159199 A JP2008159199 A JP 2008159199A JP 2010001611 A JP2010001611 A JP 2010001611A
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existing building
steel wire
strengthening
reinforcement
column
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JP5546746B2 (en
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Takayuki Imaizumi
隆之 今泉
Masahiro Yamamoto
雅弘 山本
Junji Iizuka
淳司 飯塚
Tomohiko Moroishi
智彦 諸石
Onal Tolga
オナル トルガ
Kazuaki Nishikawa
和明 西川
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Maeda Corp
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<P>PROBLEM TO BE SOLVED: To provide a seismic strengthening method for an existing building, which can maintain habitability before strengthening to the utmost, while reducing a burden imposed on an inhabitant and a constructor. <P>SOLUTION: In this seismic strengthening method for the existing building, at least either of a column and a beam, which are exposed outside the existing building, is set as a strengthening object; and a strengthening member is fixed to each of one extension-direction end of an exterior wall as the strengthening object and the other extension-direction end thereof. After that, a steel wire is stretched between the strengthening member at the one end and the strengthening member at the other end. Subsequently, the tensile force of the steel wire is adjusted so that a predetermined compressive force can be applied to the strengthening object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、既存建物の耐震補強工法に関する。   The present invention relates to a seismic reinforcement method for existing buildings.

近年、旧来の建築基準法に則って設計された建物や、老朽化が懸念される建物等の各種の既存建物に対して、その躯体を補強することにより耐震性を向上させる様々な補強手段が実施されている。
このような補強手段の一例として、図４に示すように既存建築物１００の外側に、剛性や耐力の高いバットレス１０１を建築し、このバットレス１０１をその多数の箇所で既存建築物１００に連結する技術が知られている（例えば、特許文献１参照）。また、図５に示すように、既存建物２００の窓などの開口部２０１に対して、ブレース２０２を掛け渡して、既存建物２００に連結する技術も知られている。 In recent years, for various existing buildings such as buildings that are designed according to the old Building Standards Law and buildings that are concerned about aging, there are various reinforcing means that improve the earthquake resistance by reinforcing the frame. It has been implemented.
As an example of such a reinforcing means, as shown in FIG. 4, a buttress 101 having high rigidity and strength is built outside the existing building 100, and the buttress 101 is connected to the existing building 100 at a number of locations. A technique is known (see, for example, Patent Document 1). In addition, as shown in FIG. 5, a technique of connecting a brace 202 over an opening 201 such as a window of the existing building 200 to connect to the existing building 200 is also known.

このような補強手段を採用することによって、既存建築物１００，２００の外側から耐震補強のための工事を行なうことができ、既存建築物１００，２００の内部に手を加える必要がないだけでなく、既存建築物１００，２００を使用しながら耐震補強を行うことが可能となっている。
特開２００７−３３２５５５号公報 By adopting such a reinforcing means, it is possible to carry out construction for seismic reinforcement from the outside of the existing buildings 100 and 200, and it is not necessary to modify the inside of the existing buildings 100 and 200. It is possible to perform seismic reinforcement while using the existing buildings 100 and 200.
JP 2007-332555 A

ところで、特許文献１記載の技術では、図４に示すように、バットレス１０１の基礎１０２を建物外に構築しなければならないため、その敷地を確保する必要もあるだけでなく、基礎１０２の施工費用も必要となる。
一方、図５に示す技術では、基礎等は不要であるが、ブレース２０２が開口部２０１に掛け渡されているために、窓からの視界を遮り、補強前よりも居住性が阻害されることになる。 By the way, in the technique of patent document 1, as shown in FIG. 4, since the foundation 102 of the buttress 101 must be constructed outside the building, it is not only necessary to secure the site, but also the construction cost of the foundation 102. Is also required.
On the other hand, in the technique shown in FIG. 5, a foundation or the like is unnecessary, but because the brace 202 is stretched over the opening 201, the view from the window is obstructed and the comfortability is more hindered than before reinforcement. become.

本発明の課題は、住民、事業者の負担を軽減しつつも、補強前の居住性を極力維持することのできる既存建物の耐震補強工法を提供することである。   The subject of this invention is providing the seismic reinforcement construction method of the existing building which can maintain the habitability before reinforcement as much as possible, reducing the burden of a resident and an operator.

請求項１記載の発明に係る既存建物の耐震補強工法は、
既存建物の外部に露出する柱及び梁の少なくとも一方を補強対象とし、前記補強対象の外壁における延在方向の一端部及び他端部のそれぞれに補強用部材を固定して、
前記一端部の補強用部材と前記他端部の補強用部材とに鋼線を張り渡し、
前記補強対象に対して所定の圧縮力が付与されるように、前記鋼線の張力を調整することを特徴としている。 The seismic reinforcement method for an existing building according to the invention of claim 1 is:
At least one of columns and beams exposed to the outside of an existing building is to be reinforced, and a reinforcing member is fixed to each of one end and the other end in the extending direction of the outer wall of the reinforced object,
A steel wire is stretched between the reinforcing member at the one end and the reinforcing member at the other end,
The tension of the steel wire is adjusted so that a predetermined compressive force is applied to the object to be reinforced.

請求項２記載の発明は、請求項１記載の既存建物の耐震補強工法において、
前記柱及び前記梁の両者を補強対象とする場合には、前記柱の外壁における延在方向の一端部及び他端部と、前記梁の外壁における延在方向の一端部及び他端部とのそれぞれに前記補強用部材を固定して、
全ての前記補強用部材に対して、一本の鋼線を張り渡すことを特徴としている。 The invention according to claim 2 is the seismic reinforcement method for an existing building according to claim 1,
When both the column and the beam are to be reinforced, the one end and the other end in the extending direction of the outer wall of the column and the one end and the other end in the extending direction of the outer wall of the beam Fix the reinforcing member to each,
One steel wire is stretched over all the reinforcing members.

本発明によれば、補強対象の延在方向に掛け渡された鋼線の張力が、当該補強対象に所定の圧縮力が付与されるように調整されているので、補強対象内にプレストレスとなる圧縮力が加味されることになる。このようにプレストレスが既存建物に加われば、せん断や曲げに対する耐力が高まることになり、耐震性能を向上させることができる。
また、上記の耐震補強工法では、基礎がなくとも導入反力が相殺できるため、基礎が不要となる。これにより、基礎の施工にかかる補強コストも抑制することができ、住民、事業者の負担を抑えることが可能となる。
そして、既存建物にプレストレスを加えるための鋼線は、補強対象の延在方向に沿って配置されるために、窓からの視界を遮ることもない。したがって、補強前の居住性も極力維持することが可能となる。 According to the present invention, the tension of the steel wire stretched in the extending direction of the reinforcement object is adjusted so that a predetermined compressive force is applied to the reinforcement object. The compressive force to be taken into consideration. If prestress is applied to the existing building in this way, the resistance to shearing and bending increases, and the seismic performance can be improved.
Further, in the above-mentioned seismic reinforcement method, the introduction reaction force can be offset without a foundation, so that a foundation is not necessary. Thereby, the reinforcement cost concerning construction of a foundation can also be controlled and it becomes possible to control the burden of a resident and a business operator.
And since the steel wire for applying prestress to an existing building is arrange | positioned along the extending direction of the reinforcement object, it does not obstruct the view from a window. Therefore, the habitability before reinforcement can be maintained as much as possible.

以下、本実施形態に係る既存建物の耐震補強工法について説明する。図１は、既存建物の柱に対して耐震補強を施した一例を示す側面図である。この図１に示す例では、既存建物１の外部に露出する柱２を補強対象としている。   Hereinafter, the seismic reinforcement method of the existing building which concerns on this embodiment is demonstrated. FIG. 1 is a side view showing an example in which seismic reinforcement is applied to a pillar of an existing building. In the example shown in FIG. 1, the pillar 2 exposed to the outside of the existing building 1 is targeted for reinforcement.

まず、補強対象である柱２の外壁に対して、補強用部材３，４を固定する。この際、柱２の延在方向における一端部（上端部）及び他端部（下端部）のそれぞれに補強用部材３，４を固定する。補強用部材３，４は図示しないアンカーボルトなどによって柱２に固定されている。   First, the reinforcing members 3 and 4 are fixed to the outer wall of the pillar 2 to be reinforced. At this time, the reinforcing members 3 and 4 are fixed to one end (upper end) and the other end (lower end) in the extending direction of the column 2. The reinforcing members 3 and 4 are fixed to the column 2 by anchor bolts or the like (not shown).

その後、柱２の一端部の補強用部材３と他端部の補強用部材４とに鋼線５の両端部を係止することで、当該鋼線５を補強用部材３，４間に張り渡す。そして、柱２に対して所定の圧縮力が付与されるように、周知の張力調整方法で鋼線５の張力を調整する。張力調整方法の一例の手順としては、まず、鋼線５の一端部若しくは他端部に支圧板をセットした後に、その支圧板上にアンカーヘッドを取り付ける。アンカーヘッドには鋼線５が挿通する貫通孔が設けられており、この貫通孔内に鋼線５とクサビとがセットされる。そして、油圧ジャッキによって鋼線５の張力が調整されることになる。   Thereafter, the steel wire 5 is stretched between the reinforcing members 3 and 4 by engaging both ends of the steel wire 5 with the reinforcing member 3 at one end of the column 2 and the reinforcing member 4 at the other end. hand over. And the tension | tensile_strength of the steel wire 5 is adjusted with a well-known tension adjustment method so that predetermined | prescribed compressive force may be provided with respect to the pillar 2. FIG. As a procedure of an example of the tension adjusting method, first, after setting a bearing plate on one end or the other end of the steel wire 5, an anchor head is attached on the bearing plate. The anchor head is provided with a through hole through which the steel wire 5 is inserted, and the steel wire 5 and the wedge are set in the through hole. And the tension | tensile_strength of the steel wire 5 is adjusted with a hydraulic jack.

この補強によって柱２に所定の圧縮力が付与されると、この圧縮力がプレストレスとして作用することになる。ここで、ＲＣ部材に対するせん断耐力式は下記の式（１）で表される。   When a predetermined compressive force is applied to the column 2 by this reinforcement, the compressive force acts as a prestress. Here, the shear strength formula for the RC member is expressed by the following formula (1).

Figure 2010001611
Ｑｓｕ：せん断耐力、ｐ１：引張り鉄筋比、Ｆｃ：コンクリート設計基準強度、Ｍ／Ｑ・ｄ：シアスパン比、ｐｗ：せん断補強筋比、σｗｙ：せん断補強筋の降伏点強度、σ０：軸応力度、ｂ：柱幅、ｊ：応力中心間距離
Figure 2010001611
 Q su : Shear strength, p 1 : Tensile reinforcement ratio, F c : Concrete design standard strength, M / Q · d: Shear span ratio, p w : Shear reinforcement ratio, σ wy : Yield point strength of shear reinforcement, σ 0 : degree of axial stress, b: column width, j: distance between stress centers

プレストレスが増加すると、式（１）のσ０の値が増加することになるので、柱２全体のせん断耐力値も増加することになる。このようにプレストレスが既存建物に加われば、せん断や曲げに対する耐力が高まることになり、耐震性能を向上させることができる。 When the prestress increases, the value of σ 0 in the equation (1) increases, so that the shear strength value of the entire column 2 also increases. If prestress is applied to the existing building in this way, the resistance to shearing and bending increases, and the seismic performance can be improved.

また、上記の耐震補強工法では基礎が不要なため、従来のように基礎の施工にかかる補強コストも抑制することができ、住民、事業者の負担を抑えることが可能となる。
そして、既存建物１にプレストレスを加えるための鋼線５は、柱２の延在方向に沿って配置されるために、窓６からの視界を遮ることもない（例えば図２参照）。したがって、補強前の居住性も極力維持することが可能となる。 In addition, since the above-described seismic reinforcement method does not require a foundation, it is possible to reduce the reinforcement cost for foundation construction as in the past, and to reduce the burden on residents and businesses.
And since the steel wire 5 for applying prestress to the existing building 1 is arrange | positioned along the extending direction of the pillar 2, it does not obstruct the view from the window 6 (for example, refer FIG. 2). Therefore, it is possible to maintain the comfort before reinforcement as much as possible.

なお、本発明は上記実施形態に限らず適宜変更可能であるのは勿論である。
例えば、上記実施形態では、柱２に対してのみ耐震補強を施した場合を例示して説明したが、梁に対しても上記の耐震補強を施すことも可能である。例えば、図３は既存建物１０の外部に露出する柱１２と梁１３とを補強対象とした場合を例示している。 Of course, the present invention is not limited to the above-described embodiment and can be modified as appropriate.
For example, in the above-described embodiment, the case where the earthquake-proof reinforcement is applied only to the column 2 has been described as an example, but the above-described earthquake-proof reinforcement can also be applied to the beam. For example, FIG. 3 illustrates a case where the columns 12 and the beams 13 exposed to the outside of the existing building 10 are to be reinforced.

図３に示すように、まず、補強対象である柱１２の外壁に対して、補強用部材１４，１５を固定する。この際、柱１２の延在方向における一端部（上端部）及び他端部（下端部）のそれぞれに補強用部材１４，１５を固定する。同様に、補強対象である梁１３の外壁に対して、補強用部材１６，１７を固定する。この場合においても、梁１３の延在方向における一端部（右端部）及び他端部（左端部）のそれぞれに補強用部材１６，１７を固定する。補強用部材１４〜１７は図示しないアンカーボルトなどによって柱１２や梁１３に固定されている。   As shown in FIG. 3, first, the reinforcing members 14 and 15 are fixed to the outer wall of the column 12 to be reinforced. At this time, the reinforcing members 14 and 15 are fixed to one end (upper end) and the other end (lower end) in the extending direction of the column 12, respectively. Similarly, the reinforcing members 16 and 17 are fixed to the outer wall of the beam 13 to be reinforced. Also in this case, the reinforcing members 16 and 17 are fixed to one end (right end) and the other end (left end) in the extending direction of the beam 13, respectively. The reinforcing members 14 to 17 are fixed to the columns 12 and the beams 13 by anchor bolts (not shown).

その後、柱１２に固定された補強用部材１４，１５と、梁１３に固定された補強用部材１６，１７とに鋼線１８の係止することで、当該鋼線１８を補強用部材１４，１５間と、補強用部材１６，１７間とに張り渡す。そして、柱１２や梁１３に対して所定の圧縮力が付与されるように、周知の張力調整方法で鋼線１８の張力を調整する。   Thereafter, the steel wire 18 is locked to the reinforcing members 14 and 15 fixed to the column 12 and the reinforcing members 16 and 17 fixed to the beam 13, so that the steel wire 18 is It is stretched between 15 and between the reinforcing members 16 and 17. And the tension | tensile_strength of the steel wire 18 is adjusted with a well-known tension adjustment method so that predetermined | prescribed compressive force may be provided with respect to the column 12 or the beam 13. FIG.

この補強によって柱１２や梁１３に所定の圧縮力が付与されると、この圧縮力がプレストレスとして作用することになる。これにより、柱１２や梁１３のせん断や曲げに対する耐力が高まることになり、耐震性能を向上させることができる。
また、全ての補強用部材１４〜１６に対して一本の鋼線１８を張り渡すことで、柱１２及び梁１３の耐震性能を高めることができるので、鋼線１８の使用本数を極力少なくすることができる。 When a predetermined compressive force is applied to the column 12 and the beam 13 by this reinforcement, the compressive force acts as a prestress. Thereby, the proof stress with respect to the shearing and bending of the column 12 and the beam 13 will increase, and seismic performance can be improved.
Moreover, since the seismic performance of the column 12 and the beam 13 can be enhanced by extending the single steel wire 18 to all the reinforcing members 14 to 16, the number of the steel wires 18 used is reduced as much as possible. be able to.

本発明に係る既存建物の耐震補強工法を柱に対して施した一例を示す側面図である。It is a side view which shows an example which gave the earthquake-proof reinforcement construction method of the existing building which concerns on this invention with respect to the column. 本実施形態に係る補強後の既存建物を示す正面図である。It is a front view which shows the existing building after reinforcement which concerns on this embodiment. 図１における既存建物の耐震補強工法の変形例を示す側面図である。It is a side view which shows the modification of the seismic reinforcement method of the existing building in FIG. 従来の既存建物の耐震補強工法を示す説明図である。It is explanatory drawing which shows the conventional earthquake-proof reinforcement method of the existing building. 従来の既存建物の耐震補強工法を示す説明図である。It is explanatory drawing which shows the conventional earthquake-proof reinforcement method of the existing building.

符号の説明Explanation of symbols

１，１０ 既存建物
２，１２ 柱
３，４，１４，１５，１６，１７ 補強用部材
５ 鋼線
６ 窓
１３ 梁 DESCRIPTION OF SYMBOLS 1,10 Existing building 2,12 Pillar 3,4,14,15,16,17 Member for reinforcement 5 Steel wire 6 Window 13 Beam

Claims (2)

既存建物の外部に露出する柱及び梁の少なくとも一方を補強対象とし、前記補強対象の外壁における延在方向の一端部及び他端部のそれぞれに補強用部材を固定して、
前記一端部の補強用部材と前記他端部の補強用部材とに鋼線を張り渡し、
前記補強対象に対して所定の圧縮力が付与されるように、前記鋼線の張力を調整することを特徴とする既存建物の耐震補強工法。 At least one of columns and beams exposed to the outside of an existing building is to be reinforced, and a reinforcing member is fixed to each of one end and the other end in the extending direction of the outer wall of the reinforced object,
A steel wire is stretched between the reinforcing member at the one end and the reinforcing member at the other end,
A seismic reinforcement method for an existing building, wherein the tension of the steel wire is adjusted so that a predetermined compressive force is applied to the object to be reinforced. 請求項１記載の既存建物の耐震補強工法において、
前記柱及び前記梁の両者を補強対象とする場合には、前記柱の外壁における延在方向の一端部及び他端部と、前記梁の外壁における延在方向の一端部及び他端部とのそれぞれに前記補強用部材を固定して、
全ての前記補強用部材に対して、一本の鋼線を張り渡すことを特徴とする既存建物の耐震補強工法。 In the seismic reinforcement method for an existing building according to claim 1,
When both the column and the beam are to be reinforced, the one end and the other end in the extending direction of the outer wall of the column and the one end and the other end in the extending direction of the outer wall of the beam Fix the reinforcing member to each,
A seismic reinforcement method for an existing building, in which a single steel wire is stretched over all the reinforcing members.
JP2008159199A 2008-06-18 2008-06-18 Seismic reinforcement method for existing buildings Expired - Fee Related JP5546746B2 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0734718A (en) * 1993-07-23 1995-02-03 Ohbayashi Corp Damping structure for structure
JPH1061248A (en) * 1996-08-16 1998-03-03 Ando Corp Vibration damping structure of excellent bending type building
JPH10317713A (en) * 1997-05-16 1998-12-02 Yokohama Rubber Co Ltd:The Reinforcement structure of multistoried structure
JP2001182153A (en) * 1999-12-28 2001-07-03 Chiyoda Engineering Consultants Co Ltd Reinforcing method for concrete structure body
JP2003328561A (en) * 2002-05-14 2003-11-19 Dps Bridge Works Co Ltd Reinforcing method for concrete member and tensioning device for tendon used therein

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0734718A (en) * 1993-07-23 1995-02-03 Ohbayashi Corp Damping structure for structure
JPH1061248A (en) * 1996-08-16 1998-03-03 Ando Corp Vibration damping structure of excellent bending type building
JPH10317713A (en) * 1997-05-16 1998-12-02 Yokohama Rubber Co Ltd:The Reinforcement structure of multistoried structure
JP2001182153A (en) * 1999-12-28 2001-07-03 Chiyoda Engineering Consultants Co Ltd Reinforcing method for concrete structure body
JP2003328561A (en) * 2002-05-14 2003-11-19 Dps Bridge Works Co Ltd Reinforcing method for concrete member and tensioning device for tendon used therein

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