JP2004137839A

JP2004137839A - Aseismatic reinforcing construction method for existing building and aseismatic reinforcing structure of building

Info

Publication number: JP2004137839A
Application number: JP2002305691A
Authority: JP
Inventors: Yuichiro Ogawa; 小川　雄一郎; Taizo Kawabata; 川端　泰造; Yoshito Honda; 本多　義人; Takehiko Terada; 寺田　岳彦; Yasuo Jinno; 神野　靖夫
Original assignee: Shimizu Construction Co Ltd; Shimizu Corp
Current assignee: Shimizu Construction Co Ltd; Shimizu Corp
Priority date: 2002-10-21
Filing date: 2002-10-21
Publication date: 2004-05-13
Anticipated expiration: 2022-10-21
Also published as: JP3981947B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aseismatic reinforcing construction method for an existing building enabling suppression of noise and vibration as much as possible to reduce the influence in the surroundings and shorten construction term, prevention of peeling of a joined section of an existing skeleton and an aseismatic reinforcing frame by a highly reliable and secure join method, and reduction of repair work to suppress increase of construction cost and prevent delay in construction work period. <P>SOLUTION: In this aseismatic reinforcing construction method for the existing building in which the aseismatic reinforcing frame in which a reinforcing member is attached to an inner side of a frame member 3 is assembled into a face of a reinforced opening part formed by adjacent columns 1a and a vertical beam 1b of the existing building, recessed and projecting parts are formed on at least either of an outer peripheral face 3a of the frame member 3 opposing to an inner peripheral face 1c of the reinforced opening part and a frame mounting face 5 of the reinforced opening part opposing to the outer peripheral face 3a. Joining material 7 is filled between the frame member 3 and the reinforced opening part to integrate the reinforced opening part and the frame member 3 due to solidification of the joining material 7. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、既存建物の耐震性能を向上させる既存建築物の耐震補強工法および建築物の耐震補強構造に関する。
【０００２】
【従来の技術】
一般に、既存建築物の耐震補強を行う場合、耐震補強部材を増設する工法が採用されている。これは、既存建築物の隣り合う２本の柱とこの２本の柱に架けられた上下の梁とで構成される被補強開口部の面内に、被補強開口部の内法寸法に合わせた枠部材とこの枠部材の内側に設けられた補強部材とで構成される耐震補強枠を組み入れる工法である。
【０００３】
従来、耐震補強枠を被補強開口部の面内に接合させる方法としては、大別してアンカーボルトを打ち込む方法と、接着剤によって接着する方法とがある。
【０００４】
アンカーボルトを打ち込む方法は、被補強開口部の枠取付面にアンカーボルトを打ち込み、被補強開口部の面内に組み立てられた枠部材と被補強開口部との間にスパイラル筋を配筋して無収縮モルタルを充填する方法である。この場合、枠部材には通常Ｈ型鋼が使用され、このＨ型鋼のウェブ面にはスタッドが垂直に取り付けられる。枠部材は、スタッドが取り付けられたウェブ面と被補強開口部の内側面とが対向するように組み立てられる（例えば、特許文献１参照。）。
【０００５】
また、接着剤によって接着する方法は、被補強開口部の面内に組み立てられた枠部材と被補強開口部との間に接着剤を介在させる方法である。この場合、枠部材には通常Ｈ型鋼が使用され、枠部材は、フランジ面と被補強開口部の内周面とが対向するように組み立てられるとともに、枠部材のフランジ面と被補強開口部の内周面との隙間が施工上必要な程度の大きさになるように組み立てられる。耐震補強枠を組み入れた後に隙間調整板を隙間に介在させ、隙間の大きさを調節することで接着剤の強度を確保している（例えば、特許文献２参照。）。
【０００６】
【特許文献１】
特公平７−５１８０３号公報（第２−４頁、第２図）
【特許文献２】
特開平１１−７１９０６号公報（第３−４頁、第２図）
【０００７】
【発明が解決しようとする課題】
しかしながら、上記のような従来の既存建物の耐震補強工法には以下のような問題が存在する。アンカーボルトを打ち込む方法では、アンカーボルトの穴あけの際に大きな騒音や振動が発生するため、設置階だけでなく上下階にも影響を及ぼす。また、アンカーボルトの打ち込み、鉄筋配筋、無収縮モルタル充填に先立って隙間の側面を塞ぐ型枠工事、無収縮モルタル充填等の工程が多く、工事に要する期間が長くなる。このため、上下階でも工事期間中は、オフィスビル等では業務を中断せざるを得ない場合や、マンション等では一時的な避難が余儀なくされる場合があるとともに、工事期間が長いため工事が及ぼす影響も長くなる。また、接着剤によって接合する方法では、接着剤の硬化後に枠部材に外力が加わると接合部にせん断力が働いて、接着剤の剥離等が生じる場合がある。このような場合、施工後に補修工事が必要となり、工事費用の増加及び工事期間の遅延の原因となる。
【０００８】
本発明は、上記した問題が考慮されたものであり、補強部材と枠部材からなる耐震補強枠を既存建築物の被補強開口部に組み入れて耐震性能を向上させる際、騒音や振動を極力抑えて近隣への影響を軽減させるとともに工期短縮を図るものである。また、信頼性の高い確実な接合方法により既存躯体と耐震補強枠を接合することで、接合箇所の剥離等を防止して補修工事を削減し、工事費用の増大の抑止及び工事期間の遅延の防止を図る。
【０００９】
【課題を解決するための手段】
請求項１記載の発明は、枠部材の内側に補強部材が取り付けられた耐震補強枠を、既存建築物の隣り合う柱と上下の梁によって形成される被補強開口部の面内に組み入れる既存建築物の耐震補強工法において、前記被補強開口部の内周面に対向する前記枠部材の外周面と、該外周面に対向する前記被補強開口部の枠取付面とのうち少なくとも一方に凹凸を形成し、前記枠部材および前記被補強開口部の間に接合材を充填して、該接合材が固化することで前記被補強開口部と前記枠部材とが一体化することを特徴としている。
【００１０】
請求項２記載の発明は、枠部材の内側に補強部材が取り付けられた耐震補強枠を、既存建築物の隣り合う柱と上下の梁によって形成される被補強開口部の面内に組み入れられた建築物の耐震補強構造において、前記被補強開口部の内周面に対向する前記枠部材の外周面と、該外周面に対向する前記被補強開口部の枠取付面とのうち少なくとも一方に凹凸が形成され、前記枠部材および前記被補強開口部の間に、接合材が介装されていることを特徴としている。
【００１１】
上記のような特徴により、本発明の既存建築物の耐震補強工法および耐震補強構造によれば、枠部材の外周面および被補強開口部の枠取付面のうち少なくとも一方に形成された凹凸部が接合材に定着し、枠部材と接合材および被補強開口部と接合材の間に一層強い接合力が生じる。
【００１２】
【発明の実施の形態】
以下、本発明に係る既存建築物の耐震補強工法および建築物の耐震補強構造の第１、第２の実施の形態を、図面に基づいて説明する。なお、以下に説明する実施の形態は、既存のラーメン構造による鉄筋コンクリート造建築物の耐震性能を向上させるための耐震補強方法および耐震補強構造である。
【００１３】
〈第１の実施の形態〉
本発明にかかる既存建築物の耐震補強工法および建築物の耐震補強構造の第１の実施の形態について説明する。
【００１４】
図１に示すように、被補強開口部１は、既存建築物の隣り合う柱１ａと、柱１ａに架けられている上下の梁１ｂとから構成される鉄筋コンクリート造の躯体であり、耐震補強枠２は、枠部材３と補強部材の一つであるブレース部材４とから構成され、被補強開口部１の面内に組み入れられる耐震性能を向上させるための耐震補強材である。
【００１５】
図２に示すように、被補強開口部１の内周面１ｃの中央には、枠部材３に対向する枠取付面５が帯状に伸びている。枠取付面５には、目荒しが施されて凹凸が形成されている矩形の目荒し面５ａが一定間隔をあけて設けられている。
【００１６】
図１に示すように、枠部材３は、被補強開口部１の面内に、内周面１ｃに設けられた枠取付面５に沿って四角形状に組まれており、枠取付面５との間に一定の隙間をあけて設置される。このとき、枠部材３と被補強開口部１との間にあけられた隙間は、被補強開口部１の面内に耐震補強枠２を組み入れる作業の施工性を留意した大きさを確保する。また、図３に示すように、枠部材３はＨ型鋼からなる部材であり、枠取付面５に対向する枠部材３の外周面３ａには、フランジ幅で切断された異形棒鋼３ｂがフランジ幅方向の向きに一定間隔でフレア溶接等により取り付けられており凹凸が形成されている。
【００１７】
図１に示すように、ブレース部材４は、枠部材３の内側に斜めに取り付けられた鋼製部材であり、例えば、Ｈ型鋼からなる部材である。ブレース部材４は、枠部材３の上底両隅から枠部材３の下底中央部にそれぞれ斜めに配置され固定される。また、ブレース部材４が取り付けられている枠部材３の上底両隅と下底中央部および下底両隅には、Ｈ型鋼の座屈防止のためのスチフナー６がそれぞれ設けられる。
【００１８】
図４に示すように、被補強開口部１と枠部材３との間にあけられた隙間には、接合材７が介在している。接合材７は、無収縮モルタルからなるものであり、枠取付面５および目荒し面５ａおよび外周面３ａとそれぞれ密着した状態で固化している。
【００１９】
次に、上記した構成からなる既存建築物の耐震補強構造の施工方法について説明する。
【００２０】
まず、図３に示すように、枠部材３の外周面３ａには、予め工場や現場でフランジ幅で切断された異形棒鋼３ｂを枠部材３のフランジ幅方向の向きに一定間隔でフレア溶接等により取り付け、凹凸を形成しておく。
【００２１】
次に、図２に示すように、被補強開口部１の枠取付面５には、一定間隔をあけて矩形に目荒しを施して凹凸を形成する。次に、図１に示すように、枠部材３を被補強開口部１の枠取付面５に沿って組み入れるとともに、ブレース部材４を枠部材３の上底両隅から枠部材３の下底中央部にそれぞれ斜めに配置して固定する。むろん、ブレース部材４と枠部材３とをあらかじめ一体化した耐震補強枠２を組み入れても良い。このとき、図４に示すように、枠部材３は、異形棒鋼３ｂが取り付けられた外周面３ａが枠取付面５に対向するとともに、外周面３ａと枠取付面５との間に一定の隙間を設けるように組み入れる。
【００２２】
次に、枠取付面５と外周面３ａとの間の隙間の側面を図示せぬ型枠で塞ぎ、枠取付面５と外周面３ａと図示せぬ型枠とで囲まれた空間を液密にするとともに、図示せぬ型枠には接合材７を流し込む図示せぬ注入口を設ける。この図示せぬ注入口から、流動性に優れている接合材７を枠取付面５と外周面３ａとの間の隙間へ空洞ができないように満遍無く充填する。接合材７に使用される無収縮モルタルは、時間の経過とともに収縮しないまま固化する。接合材７を充填した後、所定の養生期間をおいて接合材７を固化させて、接合材７が所定の強度を発現した後に型枠の脱型を行う。
【００２３】
上記した構成で、被補強開口部１の面内に耐震補強枠２を組み入れることで、被補強開口部１に作用する地震力などの外力によって生じる応力の分散を図り、既存建築物の損傷を防止する。また、被補強開口部１の枠取付面５および枠部材３の外周面３ａには凹凸が形成されているため、被補強開口部１の枠取付面５と接合材７、および枠部材３の外周面３ａと接合材７との間に一層強い接合力が生じる。このため、信頼性の高い確実な接合がなされ、接合箇所の剥離等を防止することができる。これによって、補修工事などが削減され、工事費用の増大の抑止及び工事期間の遅延を防止することができる。
【００２４】
また、アンカー打ち込みやスパイラル筋配筋が不要になるため、騒音や振動が減少するとともに、作業工程を縮小することができる。これによって、近隣への影響を軽減させるとともに工期短縮を図ることができる。
【００２５】
〈第２の実施の形態〉
本発明にかかる既存建築物の耐震補強工法および建築物の耐震補強構造の第２の実施の形態について説明する。なお、上記した第１の実施の形態と同じ構成要素については、同一の符号を付すことでその説明を省略する。
【００２６】
図５に示すように、枠部材３に対向する枠取付面５には、穴状の窪みが部分的にあけられてなる壺掘り部８が複数設けられて凹凸が形成されている。壺掘り部８の形状、その施工される部位などは任意選択され、例えば、柱１ａまたは梁１ｂの表面からの壺掘り部８の深さは数ミリメートルから３０ミリメートル程度であり、壺掘り部８の平面的な大きさは数平方センチメートル以上であり、壺掘り部８の間隔は１０センチメートルから２０センチメートル程度である。
【００２７】
一方、枠取付面５に対向する枠部材３の外周面３ａには、複数のボルト９が外周面３ａに垂直に固定されている。ボルト９の外周面３ａから突出している一端部はナット状になっており、枠取付面５に設けられている壺掘り部８内に配置されている。他端部は、枠取付面５に対向する枠部材３のフランジにあけられた複数の穴１０とこの穴１０に合わせてフランジの内側面に固定されたナット１１とにそれぞれ挿通されている。取付面５と枠部材３との間にあけられた隙間には、接合材７が介在されている。
【００２８】
次に、上記した構成からなる既存建築物の耐震補強構造の施工方法について説明する。
【００２９】
予め、枠取付面５に対向する枠部材３のフランジに複数の穴１０をあけ、この穴１０に合わせてフランジの内側面にナット１１を溶接する。一方、枠取付面５に対向する枠部材３の外周面３ａに複数の壺掘り部８を形成する。壺掘り部８は枠部材３に予め設けられた穴１０およびナット１１に対向する位置に形成する。
【００３０】
図６（ａ）に示すように、ボルト９の他端部を枠取付面５に対向する枠部材３の外周面３ａの方から穴１０およびナット１１の中に挿入し、ナット状の一端部が枠部材３の外周面３ａに接するところまで挿通させる。次に、図６（ｂ）に示すように、ボルト９が取り付けられた枠部材３を所定の位置に配置し、ボルト９を回転させてナット状の一端部を壺掘り部８内に挿入する。
【００３１】
次に、枠取付面５と外周面３ａとの間の隙間の側面を図示せぬ型枠で塞ぎ、枠取付面５と外周面３ａと図示せぬ型枠とで囲まれた空間に接合材７を充填する。接合材７を充填した後、所定の養生期間をおいて接合材７を固化させて、接合材７が所定の強度を発現した後に型枠の脱型を行う。
【００３２】
上記した構成により、枠取付面５に形成された壺掘り部８により枠部材３は強固に枠取付面５に固定される。さらに、枠部材３に固定されたボルト９が枠取付面５に形成された壺掘り部８内に配設されるため、より高い接合力が得られる。なお、ボルト９の固定方法はこれ以外に任意であり、例えばフランジ３ａにタップを切りボルト９をねじ込みナット１１で固定してもよい。さらに、突出部材として、取付寸法に余裕があればボルトやスタッドを予めフランジ３ａに突出固定してもよい。
【００３３】
以上、本発明に係る既存建物の耐震補強方法の第１、第２の実施の形態について説明したが、本発明は上記した実施の形態に限定されるものではなく、その趣旨を逸脱しない限り適宜応用可能である。例えば、本実施の形態では、被補強開口部１の枠取付面５および枠部材３の外周面３ａの両方に凹凸が形成されているが、所定の接合力を得られることを条件に、いずれか一方に凹凸を形成させてもよい。
【００３４】
また、本実施の形態では、被補強開口部１の枠取付面５に対向する枠部材３の外周面３ａに凹凸を形成するために、フランジ幅で切断された異形棒鋼３ｂが取り付けられているが、異形棒鋼３ｂに代わって丸鋼またはフラットバーまたはアングル材など使用してもよく、或いは枠部材３に使用するＨ型鋼に、予め凹凸のあるフランジを有するＨ型鋼を使用してもよい。
【００３５】
また、本実施の形態では、被補強開口部１の内周面１ｃに設けられた枠取付面５は、一定間隔をあけて矩形の目荒し面５ａが施されているが、目荒しの粗さを一定間隔で変化させてもよく、目荒しが粗い面と目荒しが細かい面を交互に設けてもよく、また、一定間隔をあけずに枠取付面５全てに凹凸を形成する粗い目荒しを施してもよい。また、目荒し面５ａの形状は任意であり、円や三角でもよく、これらを組み合わせてもよい。さらに、梁１ｂにおける枠取付面５のみに凹凸を形成してもよい。
【００３６】
また、本実施の形態では、補強部材としてブレース部材４を使用しているが、ブレース部材４に代えて、地震時の振動応答を低減させるために被補強開口部１の面内に配置される制震ダンパー（特開２０００−２１３２０１号公報）や、粘弾性体と鋼板とが積層されてなるブレース状のダンパーや、粘性系制震壁（特開２０００−７３６１２号公報）等を適宜使用してもよい。
【００３７】
また、本実施の形態では、枠部材３と被補強開口部１との間にあけられた隙間に介装する接合材７に無収縮モルタルを使用しているが、耐震補強枠２と被補強開口部１の接合をより高めるために、枠部材３と被補強開口部１との間の隙間を極力小さくし、接合材７としてエポキシ樹脂系接着剤を使用してもよい。
【００３８】
また、本実施の形態では、既存のラーメン構造による鉄筋コンクリート造建築物の被補強開口部１における耐震補強方法について説明したが、鉄骨鉄筋コンクリート造建築物の被補強開口部１に適用してもよい。
【００３９】
【発明の効果】
以上説明したように、本発明に係る既存建物の耐震補強方法によれば、アンカー打ち込み工事が不要であり、耐震補強工事に伴う騒音や振動を極力抑えることができるので、近隣への影響を軽減させることができる。また、アンカー打ち込み工事および鉄筋工事が不要であり、耐震補強工事の作業工程が削減されるため、工期が短縮できる。さらに、被補強開口部に対向する枠部材の外周面および枠部材に対向する被補強開口部の枠取付面を凹凸にすることで、既存躯体と耐震補強枠の接合力を高めて信頼性の高い確実な接合ができる。このため、接合箇所の剥離等は抑止され補修工事の件数は減少し、工事費用の増大を抑止するとともに工事期間の遅延を防止することができる。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態を説明する正面図である。
【図２】本発明の第１の実施の形態における耐震補強枠の外周面に対向する被補強開口部の内周面を示した斜視図である。
【図３】本発明の第１の実施の形態における耐震補強枠の枠部材を示した斜視図である。
【図４】本発明の第１の実施の形態における被補強開口部と耐震補強枠との接合部を示した斜視図である。
【図５】本発明の第２の実施の形態における被補強開口部と枠部材との接合部を示した断面図である。
【図６】本発明の第２の実施の形態における被補強開口部と枠部材との接合方法を示した断面図である。
【符号の説明】
１　被補強開口部
２　耐震補強枠
３　枠部材
３ａ外周面
３ｂ異形棒鋼
４　ブレース部材（補強部材）
５　枠取付面
５ａ目荒し面
７　接合材[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seismic retrofitting method for an existing building that improves the seismic performance of an existing building, and a seismic retrofitting structure for a building.
[0002]
[Prior art]
Generally, when an existing building is subjected to seismic retrofitting, a method of increasing the number of seismic retrofitting members is adopted. This is based on the internal dimensions of the reinforced opening in the plane of the reinforced opening composed of two adjacent pillars of the existing building and the upper and lower beams spanned by these two pillars. This is a method of incorporating an anti-seismic reinforcing frame composed of a frame member and a reinforcing member provided inside the frame member.
[0003]
2. Description of the Related Art Conventionally, methods for joining an earthquake-resistant reinforcing frame in the plane of an opening to be reinforced include a method of driving an anchor bolt roughly and a method of bonding with an adhesive.
[0004]
The method of driving the anchor bolt is to drive the anchor bolt into the frame mounting surface of the reinforced opening, and to arrange spiral streaks between the frame member assembled in the plane of the reinforced opening and the reinforced opening. This is a method of filling non-shrink mortar. In this case, an H-shaped steel is usually used for the frame member, and a stud is vertically attached to a web surface of the H-shaped steel. The frame member is assembled such that the web surface to which the stud is attached and the inner surface of the reinforced opening face each other (for example, see Patent Document 1).
[0005]
The method of bonding with an adhesive is a method of interposing an adhesive between the frame member assembled in the plane of the opening to be reinforced and the opening to be reinforced. In this case, an H-shaped steel is usually used for the frame member, and the frame member is assembled so that the flange surface and the inner peripheral surface of the reinforced opening face each other, and between the flange surface of the frame member and the reinforced opening. It is assembled so that the gap between the inner peripheral surface and the inner peripheral surface is as large as required for construction. After the seismic retrofitting frame is incorporated, a gap adjusting plate is interposed in the gap, and the size of the gap is adjusted to ensure the strength of the adhesive (for example, see Patent Document 2).
[0006]
[Patent Document 1]
Japanese Patent Publication No. 7-51803 (pages 2-4, Fig. 2)
[Patent Document 2]
JP-A-11-71906 (page 3-4, FIG. 2)
[0007]
[Problems to be solved by the invention]
However, the above-mentioned conventional seismic retrofitting method for existing buildings has the following problems. When the anchor bolt is driven in, a large noise or vibration is generated when the anchor bolt is drilled, which affects not only the installation floor but also the upper and lower floors. In addition, there are many steps such as formwork for filling the side surface of the gap before filling in the anchor bolt, reinforcing bar arrangement, and filling of the non-shrink mortar, filling of the non-shrink mortar, and the like, and the period required for the work becomes long. For this reason, during the construction period even on the upper and lower floors, work may have to be interrupted in office buildings, etc., or temporary evacuation may be forced in condominiums, etc. The effect is longer. In addition, in the method of joining with an adhesive, when an external force is applied to the frame member after the adhesive is cured, a shearing force acts on the joint, and peeling of the adhesive may occur. In such a case, repair work is required after the construction, which causes an increase in construction cost and a delay in the construction period.
[0008]
The present invention has been made in consideration of the above-described problems, and minimizes noise and vibration when improving a seismic performance by incorporating a seismic reinforced frame including a reinforcing member and a frame member into a reinforced opening of an existing building. To reduce the impact on the neighborhood and shorten the construction period. In addition, by joining the existing frame and the seismic retrofitting frame with a reliable and reliable joining method, the joints can be prevented from peeling off, reducing repair work, suppressing the increase in construction costs and delaying the construction period. To prevent it.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is an existing building in which a seismic retrofit frame in which a reinforcing member is attached to the inside of a frame member is incorporated in a plane of a reinforced opening formed by adjacent columns and upper and lower beams of the existing building. In the seismic retrofitting method of the object, the outer peripheral surface of the frame member facing the inner peripheral surface of the reinforced opening and the frame mounting surface of the reinforced opening facing the outer peripheral surface have irregularities. The reinforcing member is formed and filled with a bonding material between the frame member and the reinforcing opening, and the bonding material is solidified to integrate the reinforcing member with the frame member.
[0010]
According to the second aspect of the present invention, the seismic retrofit frame in which the reinforcement member is attached to the inside of the frame member is incorporated in the plane of the reinforcing opening formed by the adjacent columns and the upper and lower beams of the existing building. In the seismic retrofitting structure for a building, at least one of an outer peripheral surface of the frame member facing an inner peripheral surface of the reinforced opening and a frame mounting surface of the reinforced opening facing the outer peripheral surface. Is formed, and a joining material is interposed between the frame member and the opening to be reinforced.
[0011]
According to the features described above, according to the seismic retrofitting method and the seismic retrofitting structure of the existing building of the present invention, the uneven portion formed on at least one of the outer peripheral surface of the frame member and the frame mounting surface of the reinforced opening is provided. Fixing to the joining material, a stronger joining force is generated between the frame member and the joining material, and between the reinforced opening and the joining material.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, first and second embodiments of an earthquake-resistant reinforcement method for an existing building and an earthquake-resistant reinforcement structure for a building according to the present invention will be described with reference to the drawings. The embodiments described below are a seismic retrofitting method and a seismic retrofit structure for improving the seismic performance of a reinforced concrete building with an existing ramen structure.
[0013]
<First Embodiment>
A first embodiment of the seismic retrofitting method for an existing building and the seismic retrofitting structure for a building according to the present invention will be described.
[0014]
As shown in FIG. 1, the opening 1 to be reinforced is a reinforced concrete frame composed of a pillar 1 a adjacent to an existing building and upper and lower beams 1 b laid over the pillar 1 a, and the aseismic reinforcement frame is provided. Reference numeral 2 denotes an anti-seismic reinforcing material that includes a frame member 3 and a brace member 4 as one of the reinforcing members, and is incorporated in the plane of the opening 1 to be reinforced to improve the anti-seismic performance.
[0015]
As shown in FIG. 2, a frame mounting surface 5 facing the frame member 3 extends in a band shape at the center of the inner peripheral surface 1c of the opening 1 to be reinforced. The frame mounting surface 5 is provided with a rectangular roughened surface 5a having a roughened surface and irregularities formed at regular intervals.
[0016]
As shown in FIG. 1, the frame member 3 is assembled in a quadrangular shape along the frame mounting surface 5 provided on the inner peripheral surface 1 c within the surface of the opening 1 to be reinforced. It is installed with a certain gap between them. At this time, the gap provided between the frame member 3 and the reinforced opening 1 secures a size in consideration of the workability of the work of incorporating the aseismic reinforcing frame 2 in the plane of the reinforced opening 1. As shown in FIG. 3, the frame member 3 is a member made of an H-shaped steel, and a deformed steel bar 3 b cut at a flange width is provided on an outer peripheral surface 3 a of the frame member 3 facing the frame mounting surface 5. It is attached at regular intervals in the direction by flare welding or the like, and irregularities are formed.
[0017]
As shown in FIG. 1, the brace member 4 is a steel member obliquely mounted inside the frame member 3, and is, for example, a member made of H-shaped steel. The brace members 4 are arranged and fixed obliquely from the upper bottom corners of the frame member 3 to the lower bottom center of the frame member 3. In addition, stiffeners 6 for preventing buckling of the H-section steel are provided at both upper and lower corners of the frame member 3 to which the brace member 4 is attached, and at both lower and center corners and lower and lower corners.
[0018]
As shown in FIG. 4, a bonding material 7 is interposed in a gap provided between the reinforcing opening 1 and the frame member 3. The joining material 7 is made of a non-shrinkable mortar, and is solidified in a state of being in close contact with the frame mounting surface 5, the roughened surface 5a, and the outer peripheral surface 3a.
[0019]
Next, a construction method of the seismic retrofitting structure of the existing building having the above configuration will be described.
[0020]
First, as shown in FIG. 3, on an outer peripheral surface 3 a of the frame member 3, a deformed steel bar 3 b cut in advance in a flange width at a factory or a site is flare-welded at regular intervals in the flange width direction of the frame member 3. To form irregularities.
[0021]
Next, as shown in FIG. 2, irregularities are formed on the frame mounting surface 5 of the opening 1 to be reinforced by roughening the rectangle at regular intervals. Next, as shown in FIG. 1, the frame member 3 is assembled along the frame mounting surface 5 of the opening 1 to be reinforced, and the brace member 4 is moved from the upper bottom corners of the frame member 3 to the lower bottom center of the frame member 3. It is arranged obliquely on each part and fixed. Of course, the seismic reinforcement frame 2 in which the brace member 4 and the frame member 3 are integrated in advance may be incorporated. At this time, as shown in FIG. 4, the outer peripheral surface 3 a to which the deformed steel bar 3 b is attached is opposed to the frame attaching surface 5, and a fixed gap is formed between the outer peripheral surface 3 a and the frame attaching surface 5. Is incorporated so as to provide
[0022]
Next, the side surface of the gap between the frame mounting surface 5 and the outer peripheral surface 3a is closed with a mold (not shown), and the space surrounded by the frame mounting surface 5, the outer peripheral surface 3a, and the not shown mold is liquid-tight. At the same time, a mold (not shown) is provided with an inlet (not shown) into which the bonding material 7 is poured. From the injection port (not shown), the bonding material 7 having excellent fluidity is uniformly filled into the gap between the frame mounting surface 5 and the outer peripheral surface 3a so that no void is formed. The non-shrink mortar used for the bonding material 7 solidifies without shrinking over time. After filling the bonding material 7, the bonding material 7 is solidified after a predetermined curing period, and the mold is released after the bonding material 7 has developed a predetermined strength.
[0023]
In the above-described configuration, by incorporating the aseismic reinforcement frame 2 in the plane of the reinforced opening 1, stress generated by external force such as seismic force acting on the reinforced opening 1 is dispersed, and damage to the existing building is prevented. To prevent. Further, since irregularities are formed on the frame mounting surface 5 of the reinforced opening 1 and the outer peripheral surface 3 a of the frame member 3, the frame mounting surface 5 of the reinforced opening 1, the bonding material 7, and the A stronger bonding force is generated between the outer peripheral surface 3a and the bonding material 7. For this reason, reliable and reliable bonding is performed, and peeling of the bonded portion can be prevented. As a result, repair work and the like can be reduced, and an increase in construction cost can be suppressed and a delay in the construction period can be prevented.
[0024]
Further, since it is not necessary to drive the anchor or to arrange the spiral muscles, noise and vibration can be reduced, and the work process can be reduced. As a result, the influence on the neighborhood can be reduced and the construction period can be shortened.
[0025]
<Second embodiment>
A second embodiment of the seismic retrofitting method for an existing building and the seismic retrofitting structure for a building according to the present invention will be described. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0026]
As shown in FIG. 5, on the frame mounting surface 5 facing the frame member 3, there are provided a plurality of pot digging portions 8 each having a hole-like depression partially formed therein, and thus irregularities are formed. The shape of the pot digging portion 8 and the site where the pot digging portion is to be constructed are arbitrarily selected. For example, the depth of the pot digging portion 8 from the surface of the pillar 1a or the beam 1b is about several millimeters to 30 millimeters. Has a plane size of several square centimeters or more, and the interval between the pot digging portions 8 is about 10 cm to 20 cm.
[0027]
On the other hand, a plurality of bolts 9 are fixed to the outer peripheral surface 3a of the frame member 3 facing the frame mounting surface 5 vertically to the outer peripheral surface 3a. One end of the bolt 9 protruding from the outer peripheral surface 3 a has a nut shape, and is disposed in a pot digging portion 8 provided on the frame mounting surface 5. The other end is inserted through a plurality of holes 10 formed in the flange of the frame member 3 facing the frame mounting surface 5 and a nut 11 fixed to the inner surface of the flange in accordance with the holes 10. A bonding material 7 is interposed in a gap provided between the mounting surface 5 and the frame member 3.
[0028]
Next, a construction method of the seismic retrofitting structure of the existing building having the above configuration will be described.
[0029]
A plurality of holes 10 are made in advance in the flange of the frame member 3 facing the frame mounting surface 5, and a nut 11 is welded to the inner surface of the flange in accordance with the holes 10. On the other hand, a plurality of pot digging portions 8 are formed on the outer peripheral surface 3 a of the frame member 3 facing the frame mounting surface 5. The pot digging part 8 is formed at a position facing the hole 10 and the nut 11 provided in the frame member 3 in advance.
[0030]
As shown in FIG. 6A, the other end of the bolt 9 is inserted into the hole 10 and the nut 11 from the outer peripheral surface 3a of the frame member 3 facing the frame mounting surface 5, and the nut-shaped one end is inserted. Is in contact with the outer peripheral surface 3a of the frame member 3. Next, as shown in FIG. 6B, the frame member 3 to which the bolts 9 are attached is arranged at a predetermined position, and the bolts 9 are rotated to insert one end of the nut shape into the digging portion 8. .
[0031]
Next, the side surface of the gap between the frame mounting surface 5 and the outer peripheral surface 3a is closed with a mold (not shown), and a joining material is formed in a space surrounded by the frame mounting surface 5, the outer peripheral surface 3a, and the not shown mold. 7 is filled. After filling the bonding material 7, the bonding material 7 is solidified after a predetermined curing period, and the mold is released after the bonding material 7 has developed a predetermined strength.
[0032]
With the above-described configuration, the frame member 3 is firmly fixed to the frame mounting surface 5 by the pot digging portion 8 formed on the frame mounting surface 5. Furthermore, since the bolt 9 fixed to the frame member 3 is disposed in the pot digging portion 8 formed on the frame mounting surface 5, higher joining force can be obtained. The method of fixing the bolt 9 is not limited to this. For example, a tap may be cut in the flange 3 a and the bolt 9 may be fixed with the nut 11. Further, as a protruding member, bolts or studs may be protruded and fixed to the flange 3a in advance if the mounting dimensions allow.
[0033]
As described above, the first and second embodiments of the seismic retrofitting method for an existing building according to the present invention have been described. However, the present invention is not limited to the above-described embodiment, and may be appropriately changed without departing from the gist thereof. Applicable. For example, in the present embodiment, irregularities are formed on both the frame mounting surface 5 of the opening 1 to be reinforced and the outer peripheral surface 3 a of the frame member 3. Irregularities may be formed on either side.
[0034]
Further, in the present embodiment, in order to form irregularities on the outer peripheral surface 3a of the frame member 3 facing the frame mounting surface 5 of the opening 1 to be reinforced, a deformed steel bar 3b cut at a flange width is attached. However, in place of the deformed bar 3b, a round bar, a flat bar, an angle material, or the like may be used, or an H-shaped steel having an uneven flange may be used as the H-shaped steel used for the frame member 3.
[0035]
Further, in the present embodiment, the frame mounting surface 5 provided on the inner peripheral surface 1c of the opening 1 to be reinforced is provided with a rectangular rough surface 5a at regular intervals. The surface may be changed at regular intervals, rough surfaces may be alternately provided with coarse surfaces, and rough surfaces may be provided alternately. Roughing may be applied. Further, the shape of the roughened surface 5a is arbitrary, and may be a circle or a triangle, or a combination thereof. Further, irregularities may be formed only on the frame mounting surface 5 of the beam 1b.
[0036]
Further, in the present embodiment, the brace member 4 is used as the reinforcing member. However, instead of the brace member 4, the brace member 4 is disposed in the plane of the reinforced opening 1 in order to reduce a vibration response at the time of an earthquake. A vibration control damper (Japanese Patent Application Laid-Open No. 2000-213201), a brace-shaped damper in which a viscoelastic body and a steel plate are laminated, a viscous vibration control wall (Japanese Patent Application Laid-Open No. 2000-73612), and the like are appropriately used. You may.
[0037]
In this embodiment, the non-shrinkable mortar is used as the joining material 7 interposed in the gap provided between the frame member 3 and the opening 1 to be reinforced. In order to further enhance the bonding of the opening 1, the gap between the frame member 3 and the reinforcing opening 1 may be reduced as much as possible, and an epoxy resin adhesive may be used as the bonding material 7.
[0038]
Further, in the present embodiment, the seismic retrofitting method for the reinforced concrete building 1 with the existing rigid frame structure has been described. However, the present invention may be applied to the reinforced concrete building 1 with a reinforced concrete building.
[0039]
【The invention's effect】
As described above, according to the seismic retrofitting method for an existing building according to the present invention, the anchor driving work is unnecessary, and the noise and vibration accompanying the seismic retrofitting work can be suppressed as much as possible, so that the influence on the neighborhood is reduced. Can be done. Also, since the anchoring work and the reinforcing steel work are not required, and the work process of the seismic retrofitting work is reduced, the construction period can be shortened. Furthermore, by making the outer peripheral surface of the frame member facing the reinforced opening and the frame mounting surface of the reinforced opening facing the frame member uneven, the bonding strength between the existing frame and the seismic reinforced frame is increased, and reliability is improved. High reliable bonding can be achieved. For this reason, peeling of joints and the like are suppressed, the number of repair works is reduced, and an increase in construction costs can be suppressed, and a delay in the construction period can be prevented.
[Brief description of the drawings]
FIG. 1 is a front view illustrating a first embodiment of the present invention.
FIG. 2 is a perspective view showing the inner peripheral surface of the opening to be reinforced facing the outer peripheral surface of the aseismic reinforcement frame according to the first embodiment of the present invention.
FIG. 3 is a perspective view showing a frame member of the earthquake-resistant reinforcing frame according to the first embodiment of the present invention.
FIG. 4 is a perspective view showing a joint between the reinforced opening and the aseismic reinforcing frame in the first embodiment of the present invention.
FIG. 5 is a cross-sectional view showing a joint between a reinforced opening and a frame member according to a second embodiment of the present invention.
FIG. 6 is a cross-sectional view illustrating a method of joining a reinforced opening and a frame member according to a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforced opening 2 Seismic reinforcement frame 3 Frame member 3a Outer peripheral surface 3b Deformed steel bar 4 Brace member (reinforcement member)
5 Frame mounting surface 5a Rough surface 7 Joining material

Claims

In the seismic retrofitting method of an existing building, a seismic retrofitting frame with a reinforcing member attached inside the frame member is incorporated into the plane of the reinforced opening formed by adjacent columns and upper and lower beams of the existing building.
An outer peripheral surface of the frame member facing the inner peripheral surface of the reinforced opening, and at least one of a frame mounting surface of the reinforced opening facing the outer peripheral surface has irregularities formed thereon, and the frame member and A seismic retrofitting method for an existing building, characterized in that a joining material is filled between the reinforced openings and the joining material is solidified to integrate the reinforced opening and the frame member.

In the seismic retrofitting structure of a building incorporated in the plane of the reinforced opening formed by the adjacent columns and upper and lower beams of the existing building, the seismic retrofitting frame with the reinforcing member attached inside the frame member,
An outer peripheral surface of the frame member facing the inner peripheral surface of the reinforced opening, and at least one of a frame mounting surface of the reinforced opening facing the outer peripheral surface, irregularities are formed, and the frame member and A seismic retrofit structure for a building, wherein a joining material is interposed between the openings to be reinforced.