JP3844323B2

JP3844323B2 - Seismic reinforcement method for reinforced concrete columns

Info

Publication number: JP3844323B2
Application number: JP29063198A
Authority: JP
Inventors: 石橋忠良; 毅津吉; 松田芳範; 薫小林; 小林将志
Original assignee: East Japan Railway Co
Current assignee: East Japan Railway Co
Priority date: 1998-10-13
Filing date: 1998-10-13
Publication date: 2006-11-08
Anticipated expiration: 2018-10-13
Also published as: JP2000120023A

Description

【０００１】
【発明の属する技術分野】
本発明は既設高架橋柱・橋脚・橋台・建築の柱等の鉄筋コンクリート柱に対する耐震補強方法に関するものである。
【０００２】
【従来の技術】
既設の高架橋柱・橋脚・橋台・建築の鉄筋コンクリート柱に対する耐震補強方法として、鋼板巻き補強、ＲＣ巻き補強等の方法が利用されている。
鋼板巻き補強の方法は、鋼板を既設高架柱の周囲に設置し、継ぎ手部分を溶接、ボルト、機械式等により連結して巻き付け、鋼板と柱の間に間詰めモルタル等を充填する方法である。巻き付ける鋼板は柱高さのものを２枚用意し、小型クレーン等で柱を挟みこむように設置する。施工機械を利用することにより、工期が短くて施工費が安く、部材の変形性能を確実に確保できるという特徴がある。
ＲＣ（鉄筋コンクリート）巻き補強の方法は、既存の鉄筋コンクリート柱の周りに柱軸方向鉄筋および帯鉄筋を配置し、コンクリートを打設して一体化させることにより補強する方法である。帯鉄筋は柱の四隅に配置した柱軸方向鉄筋を囲むように設置し、帯鉄筋の端部をフック状に加工するか、もしくは溶接・機械式継ぎ手等にて連結することにより定着させる。この補強方法は狭隘で施工現場において、鋼板等の資材搬入が困難なＲＣ柱の補強方法として利用されている。
【０００３】
【発明が解決しようとする課題】
上記の方法で、既設の高架柱や橋台等の鉄筋コンクリート柱の耐震補強を行う場合、以下のような問題がある。
例えば、図１０（ａ）に示すように、鉄筋コンクリート柱１が施工された既設高架橋２の下には、店舗、事務所等３、壁４、あるいは屋根・天井５等が存在している場合が多々ある。また、図１０（ｂ）に示すように、高架橋の既設鉄筋コンクリート柱１の周りに壁４、天井５、床６が存在する場合等がある。このような構造上耐震壁として扱えない簡易な壁等が柱間に設置されている場合、この部分を一部撤去して補強工事を行い、その後復旧工事を行う必要があり、そのため、工事期間が長くなり、工事費が高くなってしまう。また、狭隘な施工空間で鋼板巻き補強方法を実施すると、鋼板部材の重量が大きいため機械施工が必要となり、高架下利用箇所では施工不能となる。また、ＲＣ巻き補強では型枠が必要となるため、施工スペースがない場合施工不能である。また、高架下に建物等を建てて利用している箇所では、床及び天井の撤去が必要となるため、既存工法では撤去範囲が大きく、工事費が高くなる。また、鋼板巻き、ＲＣ巻き工法では、柱断面が大きくなると共に、補強重量が大きくなるため、下部工の負担が大きくなることがある。また、型枠等の工事が大がかりとなり、工事期間が長くなるという問題がある。
【０００４】
本発明は上記課題を解決するためになされたもので、使用材料の小型化を図ることにより、高架下利用箇所等の施工困難な場所でも比較的容易に施工できる耐震補強方法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明は、補強すべき対象の鉄筋コンクリート柱の四隅に支持材を設置するとともに、四隅の支持材を取り囲むように各支持材間に連結材を設置し、四隅の支持材とこの部分に設けた定着体で連結材を締め付けることで固定し、柱隅角部のみで鉄筋コンクリート柱を拘束することを特徴とする。
また、本発明は、前記支持材の剛性を大きくし、連結材の鋼材量を少なくしたことを特徴とする。
また、本発明は、前記支持材を鉄筋コンクリート柱の所定高さ範囲にのみ設置し、若しくは中間部も一部支持材を設けないことを特徴とする。
また、本発明は、前記支持材を柱の高さ範囲にわたって設置し、連結材を所定高さ範囲にのみ設置したことを特徴とする。
また、本発明は、柱上・下端又は中間部の一部を無補強とし、その上下の連結材の鋼材量を他の連結材より多くすることを特徴とする。
また、本発明は、鉄筋コンクリート柱の四隅に支持材を設置し、該支持材にコーナー材をあてがってその上から連結材を設置し、連結具で連結材を締めつけることで固定し、柱隅角部で鉄筋コンクリート柱を拘束することを特徴とする。
また、本発明は、鉄筋コンクリート柱の四隅に支持材を設置し、該支持材にコーナー材をあてがい、コーナー材の上から１本の連結材を渦巻状に巻き付けて固定し、柱隅角部で鉄筋コンクリート柱を拘束することを特徴とする。
また、本発明は、鉄筋コンクリート柱の四隅に支持材を設置し、柱の各側面ごとに左右の支持材で互いに千鳥状になるようにコーナー材を取り付け、１本の連結材で各コーナー材を縫って固定し、柱隅角部で鉄筋コンクリート柱を拘束することを特徴とする。
また、本発明は、鉄筋コンクリート柱の四隅にコーナー材を設置し、該コーナー材の上から連結材を設置し、連結具で連結材を締めつけることで固定し、柱隅角部で鉄筋コンクリート柱を拘束することを特徴とする。
また、本発明は、鉄筋コンクリート柱の四隅に定着体と一体化した支持材を設置し、定着体と一体化した四隅の支持材で連結材を締め付けることで固定し、柱隅角部で鉄筋コンクリート柱を拘束することを特徴とする。
また、本発明は、前記定着体と一体化した支持材を柱高さ方向に分割し、分割区間ごとに連結材を設置して定着体と一体化した支持材で締めつけることで固定することを特徴とする。
【０００６】
【発明の実施の形態】
以下、本発明の実施の形態について説明する。
図１は柱隅角部のみ拘束する補強工法の概念図で、図１（ａ）は平面図、図１（ｂ）は正面図である。
既設の鉄筋コンクリート１の周囲には、図示は省略するが壁等が設置されている。この柱の四隅に断面Ｌ字型の山形鋼等の支持材１０を柱の高さに渡って設置する。支持材はコンクリート柱の隅角部に作用して柱を補強する部材である。次いで、四隅の支持材間を鋼棒等の連結材（または閉合材）１１で連結して各支持材を取り囲み、支持材１０にあてがった定着体１２で連結材１１を締めつけて支持材を固定し、隅角部のみで鉄筋コンクリート柱１を拘束する。定着体１２の代わりに、直接支持材１０で連結材１１を固定するようにしてもよい。各鋼材は必要な場合、防錆処理することにより、腐食しないようにする。また、補強後、必要な場合は補強部を保護するために簡易な外壁材を設置してもよい。
この工法では、コンクリート柱の四隅が露出している場合は、連結材１１を通す孔を壁等に開けるだけで済むため、撤去工事、復旧工事等が軽減できる。
【０００７】
図２は本発明の他の例の補強工法の概念図で、図２（ａ）は平面図、図２（ｂ）は正面図である。
この例は、支持材１０の剛性を大きくし、連結材の鋼材量を少なくする工法である。図１の例に比して、支持材１０の剛性が大きいため、この例では連結材の設置間隔を倍にし、鋼材量を１／２としている。設置方法は図１の場合と同じである。（また、定着体１２の代わりに、直接支持材１０で連結材１１を固定するようにしてもよく、各鋼材は必要な場合、防錆処理することにより、腐食しないようにする。また、補強後、必要な場合は補強部を保護するために簡易な外壁材を設置してもよい。）
図３は本発明の他の例の補強工法の概念図で、図３（ａ）は平面図、図３（ｂ）は正面図である。
この例は図２の場合と同様支持材１０の剛性を大きくし、さらに連結材１１として普通鋼材、ＰＣ鋼材、ＰＣ鋼線等の緊張材を用いて行うようにしたもので、各四隅の間を緊張材２に緊張力を与えて固定している点が異なっている。この例では連結材にプレストレスを導入することにより，連結材の鋼材料をより少なくすることができる。（設置方法は、図２の場合と同様であり、定着体１２の代わりに、直接支持材１０で連結材１１を固定するようにしてもよい。また、各鋼材は必要な場合、防錆処理することにより、腐食しないようにし、補強後、必要な場合は補強部を保護するために簡易な外壁材を設置してもよい。）
図４は本発明の他の例を示す補強工法の概念図で、図４（ａ）は平面図、図４（ｂ）、図４（ｃ）はそれぞれ正面図である。
この例は、鉄筋コンクリート柱の高さ方向一部について補強する方法であり、図４（ｂ）では、補強する部分の高さだけ支持材１０を設置し、この部分に連結材１１を設置し、締めつけるものである。また、図４（ｃ）では、支持材１０は鉄筋コンクリート柱の高さにわたって設置し、そのうちの所定の高さ区間にのみ連結材１１を設置して締めつけるものである。図４（ｂ）、図４（ｃ）のいずれの場合も、最下端の連結材は、他の連結材に比して、鋼材量の多い、太い鋼棒等を使用することが望ましい。（この例においても、定着体１２の代わりに、直接支持材１０で連結材１１を固定するようにしてもよい。また、各鋼材は必要な場合、防錆処理することにより、腐食しないようにし、補強後、必要な場合は補強部を保護するために簡易な外壁材を設置してもよい。）
次に、支持材と定着材を用いた補強工法の他の例について説明する。
図５（Ａ）はコーナー材で拘束する場合の例を示す図で、同図（ａ）は平面図、同図（ｂ）は正面図である。コーナー材は連結材を受ける座の役割をする部材である。
山形鋼等からなる支持材１０を柱の四隅にその高さに渡って設置し、支持材１０の上にコーナー材１３をあてがい、その上から連結材１１を設置して柱側部において、連結具１４により連結材（閉合材）を連結し、柱の四隅を拘束する。
【０００８】
図５（Ｂ）は支持材に添接部を接合する例を示す図で、同図（ａ）は平面図、同図（ｂ）は正面図である。
柱の四隅に山形鋼等からなる支持材１０を柱の高さに渡って設置し、連結材１１をこの支持材に直接溶接等により固定して締めつけ、柱の四隅を拘束する。
【０００９】
図５（Ｃ）は連結材（閉合材）を巻き付けて拘束する例を示しており、同図（ａ）は平面図、同図（ｂ）は正面図である。
柱の四隅に山形鋼等からなる支持材１０を柱の高さに渡って設置し、柱を囲むように鋼線繊維等からなる連結材１１を渦巻き状に巻きつけたときの柱四隅の支持材の位置にコーナー材１３をそれぞれ設置し、連結材１１でコーナー材１３を締め付けて柱の四隅を拘束する。
【００１０】
図５（Ｄ）はコーナー材を連結材（閉合材）で縫って拘束する例を示す図で、同図（ａ）は平面図、同図（ｂ）は正面図である。
柱の四隅に山形鋼等からなる支持材１０を柱の高さに渡って設置し、柱の各側面ごとに両側の支持材に互いに千鳥状になるようにコーナー材を所定間隔で設置し、あたかも靴紐を締める如く、１本の連結材でコーナー材間を連結材で縫って拘束する。したがって、各側面ごとに１本の連結材、合計４本の連結材で柱を拘束する。
【００１１】
図６は定着体のみにより補強する工法の例を示す図で、同図（ａ）は平面図、同図（ｂ）は正面図である。
この例では支持材を用いず、所定間隔でコーナー材１３を柱の四隅にあてがい、その周りから連結材（閉合材）１１を設置して締めつけ、柱側部で連結具１４によって連結材を連結して拘束する。
【００１２】
図７は支持材と定着体を一体化した補強工法を説明する図である。
図７（Ａ）は支持材を定着体として利用する場合を示す図で、同図（ａ）は平面図、同図（ｂ）は正面図である。
図示するように、柱の高さに渡って四隅にあてがわれる支持材には定着体が一体に形成されており（詳細は後述する）、これにより連結材１１を締めつけて固定し、柱の四隅を拘束する。
図７（Ｂ）は支持材を柱の長さ方向に分割した例を示す図で、同図（ａ）は平面図、同図（ｂ）は正面図である。
柱の高さに渡って四隅にあてがわれる支持材には定着体が一体に形成され、この支持材を高さ方向に分割している。分割した各支持材の定着体間に連結材を渡して締めつけることにより固定し、柱の四隅を拘束する。
【００１３】
次に、上記各例で使用する定着体の例について説明する。
図８（Ａ）定着体の１例を示す概念図で、同図（ａ）は平断面図、同図（ｂ）は側面図である。
柱の四隅には断面Ｌ字型の支持材１０が設置され、その外周に支持材の外面形状にならって内面が密着するような断面Ｌ字型の定着体１２を設置する。柱の隣り合う２つの側面から延びる連結材１１の端部にはネジ部が形成されており、定着体１２を貫通してボルト・ナットの形式で固定具１２ａ，１２ｂで各側面の連結材を締め付け、柱の四隅を拘束する。ボルト・ナットに代えてボタンヘッドで固定してもよい。
【００１４】
図８（Ｂ）は支持材と定着体を一体化した例を示す概念図で、同図（ａ）は平断面図、同図（ｂ）は側面図である。
断面Ｌ字形の山形鋼等からなる支持材１０は、高さ方向に所定幅（例えば、１０ｃｍ）を有していて、端部にネジ部を形成した連結材１１の端部が貫通する管材１５が取り付けられ、貫通孔が形成されて定着体を形成している。これをモルタル等の充填材１６で柱の四隅の所定箇所に個別に接着し、柱の隣り合う側面から延びる連結材１１の端部を管材１５、支持材１０の貫通孔を通して貫通させ、ボルト・ナット形式で固定具１２ａ，１２ｂによりネジ固定し、柱の四隅を拘束する。ボルト・ナットに代えてボタンヘッドで固定してもよい。
【００１５】
図８（Ｃ）は支持材と定着体を一体化した他の例を示す概念図で、同図（ａ）は平断面図、同図（ｂ）は側面図である。
断面Ｌ字形の山形鋼等からなる支持材１０は、柱の高さに渡る長さを有していて、端部にネジ部を形成した連結材１１の端部が貫通する管材１５が取り付けられ、貫通孔が形成されて定着体を形成している。これを柱の四隅に設置し、支持材の端部と柱側面とを塞ぐように型枠材１７を設置する。型枠材１７には連結材を貫通させるための孔が形成され、管材１５の端部がこの孔に嵌合する。支持材１０、形枠材１７、柱１の間にモルタル等の充填材１１を現場で充填する。連結材１１の端部を型枠１７、管材１５、支持材１０を貫通させ、ボルト・ナット形式で固定具１２ａ，１２ｂによりネジ固定し、柱の四隅を拘束する。ボルト・ナットに代えてボタンヘッドで固定してもよい。
【００１６】
次に、図９によりコーナー材の例について説明する。
図９（Ａ）はコーナー材の例を説明する概念図で、同図（ａ）は平断面図、同図（ｂ）は側面図である。
断面Ｌ字形の山形鋼等からなる支持材１０は、柱の高さに渡る長さを有していて、この上に内面が支持材１０の外面形状にならい、外面の角部が曲率をもつような柱高さ方向に所定幅のコーナー材１３を設け、その上から連結材１１を設置して固定し、コーナー材を通して支持材を介して柱の四隅を拘束する。
【００１７】
図９（Ｂ）はコーナー材の他の例を説明する概念図で、同図（ａ）は平断面図、同図（ｂ）は側面図である。
断面Ｌ字形の山形鋼等からなる支持材１０は、柱の高さに渡る長さを有していて、支持材１０の側面にそれぞれ板状のコーナー材１３を設置し、この上から連結材１１を設置してコーナー材を通して支持材１０を介して柱の四隅を拘束する。
【００１８】
【発明の効果】
本発明によれば、以下のような効果を達成することができる。
▲１▼高架橋の柱に駅等が設置されている場合に、この撤去範囲を極力抑えることにより、施工費を縮減すると共に、帯鉄筋として機能する連結材を柱の４隅から拘束することで、剪断補強効果を最大限に引き出すことができ、大きな変形性能を確保できる。また、鋼材は事前に工場で加工できるので、工期の短縮と経済性の向上を図ることが可能である。
▲２▼柱の隅に剛性の高い支持材を使用した場合、連結材が減ることで狭隘な作業現場において、撤去、復旧工事の一部を省略でき、狭隘な施工環境に対応できるので、経済性の向上や工期短縮が可能となる。
▲３▼連結材を緊張材とし、プレストレスを導入することにより、鋼材の有効力を最大限引き出すことができるので、鋼材量を少なくして、材料費を少なくすることができ、経済性の向上や工期短縮を図ることが可能となる。
▲４▼柱の一部のみ、本発明の補強工法を施工することにより、柱上端の天井部や柱下端の床部の施工が困難な場合、この部分の撤去を不要にするか、もしくは支持材のみ延ばすことにより、補強することができ、狭隘な作業現場において、支障箇所の撤去、復旧工事の一部を省略でき、狭隘な施工環境に対応でき、経済性の向上や工期短縮を図ることが可能となる。
▲５▼支持材、定着体、連結材、コーナー材の色々な組み合わせにより、現場の状況に応じて適宜選択し、狭隘な施工環境に対応することができ、経済性の向上を図ることが可能となる。
【図面の簡単な説明】
【図１】柱隅角部のみ拘束する補強工法の概念図である。
【図２】本発明の他の例の補強工法の概念図である。
【図３】本発明の他の例の補強工法の概念図である。
【図４】本発明の他の例の補強工法の概念図である。
【図５】支持材と定着材を用いた補強工法について説明する図である。
【図６】定着体のみにより補強する工法の例を示す図である。
【図７】支持材と定着体一体化の補強工法を説明する図である。
【図８】定着体の例を示す概念図である。
【図９】コーナー材の例を示す概念図である。
【図１０】補強対象の鉄筋コンクリート柱の設置環境を説明する図である。
【符号の説明】
１…鉄筋コンクリート、１０…支持材、１１…連結材、１２…定着体、１３…コーナー材、１４…連結具、１５…管材、１６…充填材、１７…型枠材。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic reinforcement method for reinforced concrete columns such as existing viaduct columns, piers, abutments and architectural columns.
[0002]
[Prior art]
As an earthquake-proof reinforcement method for existing viaduct columns, piers, abutments, and reinforced concrete columns in buildings, methods such as steel plate winding reinforcement and RC winding reinforcement are used.
The steel plate winding reinforcement method is a method in which a steel plate is installed around an existing elevated column, the joint portion is connected by welding, a bolt, a mechanical type, etc., and wound, and stuffed mortar is filled between the steel plate and the column. . Two steel plates with a column height are prepared for winding, and are installed so that the columns are sandwiched by a small crane or the like. By using a construction machine, the construction period is short, the construction cost is low, and the deformation performance of the member can be reliably ensured.
The RC (steel reinforced concrete) winding reinforcement method is a method in which a column axial rebar and a belt rebar are arranged around an existing reinforced concrete column, and the concrete is reinforced by being cast and integrated. The band rebar is installed so as to surround the column axial rebars arranged at the four corners of the column, and the end of the band rebar is processed into a hook shape, or is fixed by connecting with a welding / mechanical joint or the like. This reinforcing method is used as a reinforcing method for RC columns, which are narrow and difficult to carry in materials such as steel plates, at construction sites.
[0003]
[Problems to be solved by the invention]
There are the following problems when reinforced concrete columns such as existing elevated columns and abutments are reinforced by the above method.
For example, as shown in FIG. 10 (a), there may be a store, an office 3, etc. 3, a wall 4, or a roof / ceiling 5 below the existing viaduct 2 where the reinforced concrete pillar 1 is constructed. There are many. Moreover, as shown in FIG.10 (b), the wall 4, the ceiling 5, and the floor 6 may exist around the existing reinforced concrete pillar 1 of a viaduct. When such a simple wall that cannot be handled as a seismic wall is installed between the columns, it is necessary to remove some of this part and perform reinforcement work, and then perform restoration work. Will be longer and the construction cost will be higher. Moreover, if the steel plate winding reinforcement method is implemented in a narrow construction space, since the weight of the steel plate member is large, mechanical construction is required, and the construction is impossible at the use location under the overhead. Moreover, since a formwork is required for RC winding reinforcement, construction is impossible when there is no construction space. In addition, floors and ceilings need to be removed in places where buildings are used under the overpass, so the existing construction method has a large removal range and high construction costs. Further, in the steel sheet winding and RC winding method, the column cross section becomes large and the reinforcement weight increases, so the burden on the substructure may increase. Moreover, there is a problem that the construction work such as the formwork becomes large and the construction period becomes long.
[0004]
The present invention has been made to solve the above-mentioned problems, and provides a seismic reinforcement method that can be constructed relatively easily even in difficult-to-construct locations such as under-utilized locations by reducing the size of the materials used. Objective.
[0005]
[Means for Solving the Problems]
In the present invention, support members are installed at the four corners of the reinforced concrete columns to be reinforced, and connecting members are installed between the support members so as to surround the support members at the four corners. The fixing member is fixed by tightening the connecting material, and the reinforced concrete column is restrained only at the corner portion of the column.
Further, the present invention is characterized in that the rigidity of the support material is increased and the amount of steel material of the connecting material is reduced.
Further, the present invention is characterized in that the support material is installed only in a predetermined height range of the reinforced concrete column, or a part of the support material is not provided in the intermediate portion.
Further, the present invention is characterized in that the support material is installed over a height range of the column, and the connecting material is installed only in a predetermined height range.
Further, the present invention is characterized in that a part of the upper / lower end of the column or part of the middle part is not reinforced, and the amount of steel of the upper and lower connecting members is larger than that of other connecting members.
In addition, the present invention provides a support member installed at the four corners of the reinforced concrete column, a corner member is applied to the support member, a connecting member is installed thereon, and the connecting member is fastened with a connector to fix the column corner angle. It is characterized by restraining a reinforced concrete column at the part.
In the present invention, support members are installed at the four corners of a reinforced concrete column, a corner member is applied to the support member, and one connecting member is wound around the corner member and fixed in a spiral shape. It is characterized by restraining reinforced concrete columns.
In the present invention, the support members are installed at the four corners of the reinforced concrete column, and the corner members are attached in a staggered manner with the left and right support members for each side surface of the column. It is fixed by sewing and restrains a reinforced concrete column at the corner of the column.
In addition, the present invention installs a corner material at the four corners of a reinforced concrete column, installs a connecting material over the corner material, and fastens the connecting material with a connector, and fixes the reinforced concrete column at the corner of the column. It is characterized by doing.
In addition, the present invention provides a support member integrated with the fixing body at the four corners of the reinforced concrete column, and is fixed by fastening the connecting material with the support member of the four corners integrated with the fixing body, and the reinforced concrete column is fixed at the corner portion of the column. It is characterized by restraining.
In the present invention, the support member integrated with the fixing member is divided in the column height direction, and a connecting member is provided for each divided section and fixed by fastening with the support member integrated with the fixing member. Features.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 is a conceptual diagram of a reinforcing method for constraining only a column corner, FIG. 1 (a) is a plan view, and FIG. 1 (b) is a front view.
Around the existing reinforced concrete 1, a wall or the like is installed although not shown. Support members 10 such as angle steels having an L-shaped cross section are installed at the four corners of the column over the height of the column. The support member is a member that acts on the corner portion of the concrete column to reinforce the column. Next, the support members at the four corners are connected by connecting members (or closing members) 11 such as steel bars to surround each supporting member, and the connecting member 11 is fastened by the fixing body 12 applied to the supporting member 10 to fix the supporting members. Then, the reinforced concrete column 1 is restrained only at the corners. Instead of the fixing body 12, the connecting material 11 may be directly fixed by the support material 10. When necessary, each steel material is treated to prevent corrosion by rust prevention treatment. In addition, after reinforcement, a simple outer wall material may be installed to protect the reinforcing portion if necessary.
In this construction method, when the four corners of the concrete pillar are exposed, it is only necessary to open a hole through the connecting material 11 in the wall or the like, so that the removal work, the restoration work, etc. can be reduced.
[0007]
2A and 2B are conceptual diagrams of a reinforcing method according to another example of the present invention. FIG. 2A is a plan view and FIG. 2B is a front view.
This example is a method of increasing the rigidity of the support material 10 and reducing the amount of steel of the connecting material. Since the support member 10 has higher rigidity than the example of FIG. 1, the installation interval of the connecting members is doubled in this example, and the amount of steel material is halved. The installation method is the same as in FIG. (Alternatively, instead of the fixing body 12, the connecting material 11 may be directly fixed by the support material 10. If necessary, each steel material is prevented from being corroded by rust-proofing. Later, if necessary, a simple outer wall material may be installed to protect the reinforcing portion.)
FIG. 3 is a conceptual diagram of another example of the reinforcing method of the present invention. FIG. 3 (a) is a plan view and FIG. 3 (b) is a front view.
In this example, the rigidity of the support member 10 is increased as in the case of FIG. 2, and further, a tension member such as ordinary steel material, PC steel material, PC steel wire is used as the connecting material 11. Is different in that the tension material 2 is fixed with tension. In this example, by introducing prestress into the connecting material, the steel material of the connecting material can be reduced. (The installation method is the same as in the case of FIG. 2, and instead of the fixing body 12, the connecting material 11 may be directly fixed by the support material 10. Moreover, when each steel material is necessary, the rust prevention treatment is performed. In order to prevent corrosion, a simple outer wall material may be installed after reinforcement to protect the reinforcement if necessary.)
FIG. 4 is a conceptual diagram of a reinforcing method showing another example of the present invention. FIG. 4 (a) is a plan view, and FIGS. 4 (b) and 4 (c) are front views.
This example is a method of reinforcing a part of the reinforced concrete column in the height direction. In FIG. 4B, the support material 10 is installed at the height of the part to be reinforced, and the connecting material 11 is installed in this part. Tighten. Moreover, in FIG.4 (c), the support material 10 is installed over the height of a reinforced concrete pillar, and the connection material 11 is installed and tightened only to the predetermined | prescribed height area of them. In both cases of FIG. 4B and FIG. 4C, it is desirable to use a thick steel rod or the like having a large amount of steel as the lowermost connecting material as compared with other connecting materials. (In this example as well, the connecting material 11 may be directly fixed by the support material 10 instead of the fixing body 12. Also, when necessary, each steel material is subjected to rust prevention treatment so as not to corrode. After reinforcement, if necessary, a simple outer wall material may be installed to protect the reinforcement portion.)
Next, another example of a reinforcing method using a support material and a fixing material will be described.
FIG. 5A is a diagram showing an example of restraining with a corner member, where FIG. 5A is a plan view and FIG. 5B is a front view. The corner material is a member that serves as a seat for receiving the connecting material.
A support material 10 made of angle steel or the like is installed at the four corners of the column over the height, a corner material 13 is applied on the support material 10, and a connecting material 11 is installed on the corner material 13 to connect at the column side. The connecting material (closing material) is connected by the tool 14, and the four corners of the column are restrained.
[0008]
FIG. 5B is a view showing an example in which the attachment portion is joined to the support member, where FIG. 5A is a plan view and FIG. 5B is a front view.
A support member 10 made of angle steel or the like is installed at the four corners of the column over the height of the column, and the connecting member 11 is directly fixed to the support member by welding or the like and tightened to restrain the four corners of the column.
[0009]
FIG. 5C shows an example in which a connecting material (closing material) is wound and restrained, where FIG. 5A is a plan view and FIG. 5B is a front view.
Supports 10 at the four corners of the pillar when the support 10 made of angle steel is installed at the four corners of the pillar over the height of the pillar, and the connecting material 11 made of steel wire fiber or the like is wound spirally around the pillar. The corner members 13 are respectively installed at the positions of the members, and the corner members 13 are fastened by the connecting members 11 to restrain the four corners of the pillar.
[0010]
FIG. 5D is a diagram showing an example in which the corner material is sewn and constrained with a connecting material (closing material), where FIG. 5A is a plan view and FIG. 5B is a front view.
Support materials 10 made of angle steel or the like are installed at the four corners of the column over the height of the columns, and corner materials are installed at predetermined intervals so that each side surface of the column is staggered on both sides of the support material, As if to tighten the shoelace, the corner material is sewn and constrained with one connecting material. Therefore, the column is constrained by one connecting member for each side face and a total of four connecting members.
[0011]
FIGS. 6A and 6B are diagrams showing an example of a construction method in which reinforcement is performed only by a fixing body. FIG. 6A is a plan view and FIG. 6B is a front view.
In this example, the support material is not used, the corner material 13 is applied to the four corners of the column at predetermined intervals, the connection material (closing material) 11 is installed and tightened from around the corner material, and the connection material is connected by the connector 14 at the side of the column. And restrain it.
[0012]
FIG. 7 is a diagram for explaining a reinforcing method in which a support material and a fixing body are integrated.
FIG. 7A is a diagram showing a case where a support material is used as a fixing member, where FIG. 7A is a plan view and FIG. 7B is a front view.
As shown in the figure, a fixing member is integrally formed on the support material applied to the four corners over the height of the pillar (details will be described later), and thereby the connecting material 11 is fastened and fixed. Restrain the four corners.
FIG. 7B is a diagram showing an example in which the support material is divided in the length direction of the column, where FIG. 7A is a plan view and FIG. 7B is a front view.
A fixing member is integrally formed on the support material applied to the four corners over the height of the pillar, and the support material is divided in the height direction. It fixes by passing and fastening a connecting material between the fixing bodies of each divided supporting material, and restrains the four corners of the pillar.
[0013]
Next, examples of the fixing member used in each of the above examples will be described.
FIG. 8A is a conceptual diagram showing an example of a fixing body, where FIG. 8A is a cross-sectional view, and FIG. 8B is a side view.
Support members 10 having an L-shaped cross section are installed at the four corners of the pillar, and fixing members 12 having an L-shaped cross section are installed on the outer periphery of the pillars so that the inner surfaces are in close contact with the outer surface shape of the support material. A threaded portion is formed at the end of the connecting member 11 extending from the two adjacent side surfaces of the pillar, and the connecting member on each side is connected to the fixing member 12 in the form of bolts and nuts by the fixtures 12a and 12b. Tighten and restrain the four corners of the column. A button head may be used instead of the bolt and nut.
[0014]
FIG. 8B is a conceptual diagram showing an example in which the support material and the fixing body are integrated, where FIG. 8A is a cross-sectional plan view, and FIG. 8B is a side view.
The support member 10 made of angle steel having an L-shaped cross section has a predetermined width (for example, 10 cm) in the height direction, and the tube member 15 through which the end of the connecting member 11 having a threaded portion formed at the end penetrates. And a through hole is formed to form a fixing body. This is individually bonded to predetermined positions at the four corners of the column with a filler 16 such as mortar, and the ends of the connecting material 11 extending from the adjacent side surfaces of the column are passed through the through holes of the tube material 15 and the support material 10, The nuts are fixed with screws by the fixtures 12a and 12b, and the four corners of the column are restrained. A button head may be used instead of the bolt and nut.
[0015]
FIG. 8C is a conceptual diagram showing another example in which the support material and the fixing body are integrated. FIG. 8A is a plan sectional view, and FIG. 8B is a side view.
The support member 10 made of angle steel having an L-shaped cross section has a length extending over the height of the column, and a pipe member 15 through which the end of the connecting member 11 having a threaded portion formed at the end passes is attached. Through holes are formed to form a fixing body. This is installed at the four corners of the column, and the formwork material 17 is installed so as to close the end of the support material and the side surface of the column. A hole for penetrating the connecting material is formed in the mold material 17, and an end portion of the tube material 15 is fitted into this hole. A filler 11 such as mortar is filled between the support material 10, the frame material 17, and the pillar 1 on site. The end portion of the connecting material 11 is passed through the mold 17, the tube material 15, and the support material 10, and is fixed with screws 12 a and 12 b in the form of bolts and nuts to restrain the four corners of the column. A button head may be used instead of the bolt and nut.
[0016]
Next, an example of a corner material will be described with reference to FIG.
FIG. 9A is a conceptual diagram illustrating an example of a corner member, where FIG. 9A is a cross-sectional view, and FIG. 9B is a side view.
The support member 10 made of angle steel having an L-shaped cross section has a length that extends over the height of the column, and the inner surface of the support member 10 follows the shape of the outer surface of the support member 10 and the corners of the outer surface have a curvature. A corner member 13 having a predetermined width is provided in such a column height direction, and a connecting member 11 is installed and fixed thereon, and the four corners of the column are constrained through the corner member via a support member.
[0017]
FIG. 9B is a conceptual diagram for explaining another example of the corner material, where FIG. 9A is a cross-sectional view, and FIG. 9B is a side view.
The support member 10 made of angle steel having an L-shaped cross section has a length extending over the height of the column, and plate-like corner members 13 are respectively installed on the side surfaces of the support member 10, and a connecting member is formed from above. 11 is installed and the four corners of the column are constrained through the corner material and the support material 10.
[0018]
【The invention's effect】
According to the present invention, the following effects can be achieved.
(1) When a station, etc. is installed on a viaduct pillar, by suppressing this removal range as much as possible, the construction cost is reduced and the connecting material that functions as a belt reinforcement is restrained from the four corners of the pillar. In addition, the shear reinforcement effect can be maximized and a large deformation performance can be secured. Moreover, since the steel material can be processed in advance in the factory, it is possible to shorten the construction period and improve the economic efficiency.
(2) If a support material with high rigidity is used at the corner of the pillar, the removal and restoration work can be omitted in a narrow work site by reducing the number of connecting materials. It is possible to improve the performance and shorten the construction period.
(3) By using a connecting material as a tension material and introducing pre-stress, the effective power of the steel material can be maximized, so the amount of steel material can be reduced, the material cost can be reduced, and economical efficiency can be reduced. It becomes possible to improve and shorten the construction period.
(4) If it is difficult to install the ceiling part at the top of the column or the floor part at the bottom of the column by constructing the reinforcement method of the present invention on only a part of the column, removal of this part is unnecessary or supported. By extending only the material, it can be reinforced, and in a narrow work site, removal of troubled parts and part of the restoration work can be omitted, it is possible to cope with a narrow construction environment, and to improve economy and shorten the construction period. Is possible.
(5) Various combinations of support materials, fixing bodies, connecting materials, and corner materials can be selected as appropriate according to the situation at the site, so that it is possible to cope with a narrow construction environment and improve economic efficiency. It becomes.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a reinforcing method for constraining only column corners.
FIG. 2 is a conceptual diagram of a reinforcing method according to another example of the present invention.
FIG. 3 is a conceptual diagram of a reinforcing method according to another example of the present invention.
FIG. 4 is a conceptual diagram of a reinforcing method according to another example of the present invention.
FIG. 5 is a diagram illustrating a reinforcing method using a support material and a fixing material.
FIG. 6 is a diagram illustrating an example of a construction method in which reinforcement is performed only by a fixing body.
FIG. 7 is a diagram illustrating a reinforcing method for integrating a support material and a fixing body.
FIG. 8 is a conceptual diagram illustrating an example of a fixing member.
FIG. 9 is a conceptual diagram showing an example of a corner material.
FIG. 10 is a diagram illustrating an installation environment of a reinforced concrete column to be reinforced.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Reinforced concrete, 10 ... Support material, 11 ... Connection material, 12 ... Fixing body, 13 ... Corner material, 14 ... Connection tool, 15 ... Pipe material, 16 ... Filling material, 17 ... Formwork material.

Claims

With installing the support on four corners of the reinforced concrete columns of the object to be reinforced, established the coupling member so as to surround the four corners of the support between the support, coupled with a fixing member provided on the portion and the four corners of the support A method for seismic reinforcement of a reinforced concrete column, characterized in that the reinforced concrete column is fixed by fastening the material and restrains the reinforced concrete column only at the corner of the column.

The method for seismic reinforcement of a reinforced concrete column according to claim 1, wherein the rigidity of the support member is increased and the amount of steel of the connecting member is reduced.

The method for seismic reinforcement of a reinforced concrete column according to claim 1, wherein the support material is installed only in a predetermined height range of the reinforced concrete column, or a part of the intermediate part is not provided with the support material.

The method for seismic reinforcement of a reinforced concrete column according to claim 1, wherein the support material is installed over a height range of the column, and the connecting material is installed only in a predetermined height range.

5. The method for seismic reinforcement of a reinforced concrete column according to claim 3, wherein a part of the upper / lower end or middle part of the column is not reinforced and the amount of steel of the upper and lower connecting members is larger than that of the other connecting members.

Support materials are installed at the four corners of reinforced concrete columns, corner materials are applied to the support materials, connecting materials are installed on the support materials, and the connecting materials are fastened by connecting tools, and the reinforced concrete columns are restrained at the corners of the columns. Seismic reinforcement method for reinforced concrete columns.

Support materials are installed at the four corners of reinforced concrete columns, corner materials are applied to the support materials, one connecting material is wound around the corner materials and fixed in a spiral shape, and the reinforced concrete columns are restrained at the corners of the columns. Seismic reinforcement method for reinforced concrete columns.

Support materials are installed at the four corners of a reinforced concrete column, corner materials are attached so that each side of the column is staggered with the left and right support materials, and each corner material is sewn and fixed with one connecting material. An anti-seismic reinforcement method for reinforced concrete columns, characterized by restraining reinforced concrete columns at corners.

Corner materials are installed at the four corners of a reinforced concrete column, a connecting material is installed on the corner material, the connecting material is fastened by fastening the connecting material, and the reinforced concrete column is restrained at the corner of the column. Seismic reinforcement method for reinforced concrete columns.

The support material integrated with the fixing body is installed at the four corners of the reinforced concrete column, and the connecting material is fastened with the support material at the four corners integrated with the fixing body, and the reinforced concrete column is restrained at the corner of the column. Seismic reinforcement method for reinforced concrete columns.

11. The support member integrated with the fixing member is divided in a column height direction, and a connecting member is provided for each divided section and fixed by fastening with a support member integrated with the fixing member. Seismic reinforcement method for reinforced concrete columns as described.