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JP2004116081A - Reinforcement structure and method for existing structures - Google Patents

Reinforcement structure and method for existing structures Download PDF

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JP2004116081A
JP2004116081A JP2002279587A JP2002279587A JP2004116081A JP 2004116081 A JP2004116081 A JP 2004116081A JP 2002279587 A JP2002279587 A JP 2002279587A JP 2002279587 A JP2002279587 A JP 2002279587A JP 2004116081 A JP2004116081 A JP 2004116081A
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force receiving
receiving member
steel
reinforcing
reaction force
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JP3867037B2 (en
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Tadahiro Enokida
榎田　忠宏
Yoshihiro Takano
高野　良広
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Nippon Steel Corp
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Nippon Steel Corp
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Abstract

【課題】既存の構造物に損傷を与えることなく、曲げモーメントおよびせん断力に対する補強を効率的に行なうことのできる補強構造を提供する。
【解決手段】柱梁構造物、橋梁などの既存構造物の補強構造であって、梁または桁の軸方向に延長する水平力受け材１と、梁または桁の補強箇所の下側に配置された反力受け材２と、前記水平力受け材１に端部が固定され、かつ前記反力受け材２の下側に張設されたＰＣ鋼材３とからなり、張力が導入された前記ＰＣ鋼材３によって前記反力受け材２が押し上げられて、梁または桁の補強箇所が下側から支持されることを特徴とする既存構造物の補強構造。
【選択図】　図１An object of the present invention is to provide a reinforcing structure capable of efficiently reinforcing a bending moment and a shearing force without damaging an existing structure.
A reinforcing structure for an existing structure such as a column-beam structure or a bridge, wherein the horizontal force-receiving member 1 extends in the axial direction of the beam or the girder, and is disposed below a reinforcing portion of the beam or the girder. The reaction force receiving material 2 and the PC steel material 3 whose end is fixed to the horizontal force receiving material 1 and which is stretched under the reaction force receiving material 2, wherein the tension is introduced to the PC. A reinforcing structure for an existing structure, wherein the reaction force receiving member 2 is pushed up by a steel material 3 and a reinforcing portion of a beam or a girder is supported from below.
[Selection diagram] Fig. 1

Description

【０００１】
【発明の属する技術分野】
本発明は柱梁構造物、橋梁などの既存構造物の補強に関するものであり、特に既存の構造物に損傷を与えることなく、曲げモーメントおよびせん断力に対する補強を効率的に行なうことのできる補強構造を提供する。
【０００２】
【従来の技術】
既存の柱梁構造や橋梁などにおいて、積載荷重増に伴なう補強工事を行なう場合には、例えば、断面補強材の取付けやコンクリートの打ち足し等によって、柱または梁の断面性能を向上させるのが一般的である。このような補強方法は現地での工事が主体であることから工期が延びる傾向がある上に、積載荷重の一時除荷が必要となる場合もあり、工事の際に多くの制約条件が課されることがある。
【０００３】
そのため、安価かつ短期間で既存構造物の補強を行なう工法として、梁材の外に補強ケーブルを設置して、補強ケーブルに張力を導入する補強工法が近年盛んに行なわれている（例えば、特許文献１参照）。この補強工法では、既存の梁の両端に補強ケーブルの定着部を設け、定着部間を補強ケーブル（ＰＣ鋼材）で緊張して梁の軸方向に偏心圧縮力を導入し、梁内の応力を相殺することで既存梁の補強を行なっている。なお、梁に作用する曲げモーメントおよびせん断力を有効に緩和させるため、補強ケーブルは下向き凸形状をなすように弓なりで湾曲配置されることが多い。
【０００４】
上記の補強ケーブルを用いた補強工法では、補強ケーブルを定着させる定着部および補強ケーブルが湾曲する偏向部において既存梁を改造しなければならない。しかし、既存梁の改造工事は梁を構成する鉄骨、コンクリート、鉄筋等を傷めるため、その内容に制約も多く、また施工には細心の注意が要求されることになる。
【０００５】
そこで、既存梁の定着部の改造をすることなく、補強ケーブルを用いて既存梁を補強する工法も提案されている（例えば、特許文献２参照）。しかし、特許文献２の場合には補強ケーブルの設置が困難である場合も多い。しかも、特許文献２の場合では補強ケーブルを湾曲配置することができないので、梁材に発生するせん断力の補強にはならない点で改善の余地が多い。
【０００６】
【特許文献１】
特開平５−７９０１６号公報
【特許文献２】
特開２００１−１８２１５３号公報
【０００７】
【発明が解決しようとする課題】
本発明は前記従来技術の課題を解決するためにされたものであり、その目的は定着部等の改造を最小限に抑えることで、既存の構造物に損傷を与えることなく、曲げモーメントおよびせん断力に対する補強を効率的に行なうことである。
【０００８】
【課題を解決するための手段】
（１）第１の発明は、柱梁構造物、橋梁などの既存構造物の補強構造であって、梁または桁の軸方向に延長する水平力受け材１と、梁または桁の補強箇所の下側に配置された反力受け材２と、前記水平力受け材１に端部が固定され、かつ前記反力受け材２の下側に張設されたＰＣ鋼材３とからなり、張力が導入された前記ＰＣ鋼材３によって前記反力受け材２が押し上げられて、梁または桁の補強箇所が下側から支持されることを特徴とする既存構造物の補強構造である。
【０００９】
（２）第２の発明は、第１の発明において、各水平力受け材１は梁または桁の底面よりも上方に配置され、ＰＣ鋼材３の両端は前記水平力受け材１に設けられた定着部１ａで固定されており、かつ前記ＰＣ鋼材３は反力受け材２の下側を経て下向き凸形状に張設されており、前記定着部１ａの両側から張力が導入された前記ＰＣ鋼材３によって反力受け材２が支持されることを特徴とする。
【００１０】
（３）第３の発明は、第１の発明において、各水平力受け材１は梁または桁の底面よりも下方に配置され、ＰＣ鋼材３の両端は前記水平力受け材１に設けられた定着部１ａで固定されており、かつ前記ＰＣ鋼材３は、反力受け材２が載置された支持梁材８の下側を経て下向き凸形状に張設されており、前記定着部１ａの両側から張力が導入された前記ＰＣ鋼材３によって反力受け材３および支持梁材８が支持されることを特徴とする。
【００１１】
（４）第４の発明は、第１の発明において、各水平力受け材１は梁または桁の底面よりも下方に配置され、反力受け材２が載置される支持梁材８は、前記水平力受け材１の両側から前記支持梁材８に向けて張設された２本１組のＰＣ鋼材３，３で支持されており、前記支持梁材８の定着部８ａから前記ＰＣ鋼材に張力が導入されることを特徴とする。
【００１２】
（５）第５の発明は、柱梁構造物、橋梁などの既存構造物において、水平力受け材１を梁または桁の軸方向に延長するように配置した後、梁または桁の補強箇所の下側に反力受け材２を配置し、かつＰＣ鋼材３を前記反力受け材２の下側に張設して、前記ＰＣ鋼材３の端部を前記水平力受け材１に固定して、前記ＰＣ鋼材３に張力を導入することで前記反力受け材２を押し上げて、梁または桁の補強箇所を下側から支持することを特徴とする既存構造物の補強方法である。
【００１３】
【発明の実施の形態】
＜第１実施形態＞
以下、本発明の第１実施形態に係る既存構造物の補強構造を図１および図２を参照しつつ説明する。第１実施形態の補強構造は、水平力受け材１、反力受け材２、ＰＣ鋼線またはＰＣより線などのＰＣ鋼材３が主要な構成をなしており、張力が導入されたＰＣ鋼材３によって反力受け材２を押し上げ、主梁４に積載された荷重を相殺することで補強を行なう。
【００１４】
第１実施形態の水平力受け材１は、補強対象となる主梁４の底面よりも上方において、主梁４の両側に各１本ずつ配置されている。２本の水平力受け材１は主梁４の軸方向に延長しており、主梁４を両側から挟み込むように平行に配置されている。また各水平力受け材１の両端は、主梁４と直交する横梁５の上に載置された架台６に固定されている。そして各水平力受け材１の両端付近には、ＰＣ鋼材３を固定して反力をとるための定着部１ａがそれぞれ設けられている。なお、水平力受け材１は必ずしも複数本配置する必要はなく、１本のみ配置する形態であってもよい［図示を省略する］。
【００１５】
反力受け材２は、主梁４の補強箇所の下側において、主梁４と直交して配置される。反力受け材２の長さは主梁４の幅よりも長く設定され、反力受け材２の両端は主梁４の両側から突出している。そして反力受け材２の両端部の下側にはそれぞれＰＣ鋼材３，３が張設されている。すなわち、図１に示すように、反力受け材２は主梁４の補強箇所の底面とＰＣ鋼材３とに挟まれて配置されている。なお、本発明における反力受け材２は、図示の例（２個）に限定されることなく、主梁４の補強箇所の数に応じて、その数を増減することができる。
【００１６】
また、それぞれの水平力受け材１の下側には、張力が導入されたＰＣ鋼材３が下向き凸形状をなすように湾曲して張設されている。ＰＣ鋼材３の両端部は、水平力受け材１に設けられた定着部１ａにそれぞれ固定されており、反力受け材２の下側で偏向して、反力受け材２，２の下側を通過するように下向き凸形状で配置されている。なお、ＰＣ鋼材３の湾曲を大きくする場合には、反力受け材２または架台６の高さを大きくすることで調整できる。
【００１７】
ここで第１実施形態の補強構造は、例えば以下の工程で構築される。
（ａ）補強対象の主梁４から突出した横梁５に架台６を載置し、主梁４を挟んで平行をなすように、２本の水平力受け材１を架台６の上に配置する。
（ｂ）主梁４の補強箇所の下側に反力受け材２を配置し、反力受け材２の下にＰＣ鋼材３を掛け渡して、ＰＣ鋼材３の両端を水平力受け材１の定着部１ａに挿通する。
（ｃ）そして、ジャッキ等によってＰＣ鋼材３に両側から張力を導入し、ＰＣ鋼材３を定着部１ａで固定する。これにより、反力受け材２がＰＣ鋼材３によって押し上げられて、主梁４の補強箇所が下側から支持される。
【００１８】
第１実施形態の補強構造は上記のように構成されており、以下その作用を説明する。第１実施形態の補強構造は、水平力受け材１、反力受け材２などをアタッチメント的に取り付けて既存構造物の補強を行なうので、ＰＣ鋼材３を取り付けるための既存構造物の改造工事を最小限に抑えることができる。
【００１９】
また第１実施形態の補強構造では、張力が導入されたＰＣ鋼材３の上に配置された反力受け材２によって主梁４の補強箇所が下側から支持されるので主梁４にかかる積載荷重が相殺され、主梁４に作用する曲げモーメントおよびせん断応力が大幅に緩和される。
【００２０】
ここで、梁に作用するせん断力を緩和させる場合には、ＰＣ鋼材を下向き凸形状で湾曲配置して、梁端部に下向きの補強荷重を発生させる一方で、梁中央部に上向きの補強荷重を発生させることが有効な補強となる。このせん断力をより大きく緩和しようとする場合には、ＰＣ鋼材の端部と中央部の高低差を大きくし、ＰＣ鋼材を大きく湾曲させるように配置して補強荷重を大きくすればよい。しかし、ＰＣ鋼材の湾曲を大きくするにはＰＣ鋼材の定着部を梁上に設置する必要がでてくるが、ＰＣ鋼材の偏心によって発生する曲げモーメントを大きくさせることから、その両立が困難であった。
【００２１】
そのため第１実施形態の補強構造では、ＰＣ鋼材３の両端を水平力受け材１に固定し、ＰＣ鋼材３を湾曲配置することで生じる偏心曲げモーメントの原因である水平力を水平力受け材１に負担させる構成とした。つまり、補強対象となる主梁４から独立した水平力受け材１が偏心曲げモーメントを負担して、主梁４には偏心曲げモーメントが伝達されない一方で、ＰＣ鋼材３の緊張で発生した上向きの補強荷重は反力受け材２によって主梁４に伝達される。
【００２２】
したがって、第１実施形態の補強構造では、ＰＣ鋼材３の端部と中央部の高低差を大きくするようにＰＣ鋼材を配置しても、偏心曲げモーメントを増加させることなく大きな補強荷重を既存構造物に伝達できる構成であるため非常に有利である。
【００２３】
＜第２実施形態＞
図３および図４は第２実施形態における既存構造物の補強構造を示した図である。なお、以下の実施形態では第１実施形態と共通の構成には同一符号を付して説明を省略する。
【００２４】
第２実施形態では、柱７の主梁４の下に設けたブラケット７ａの上に水平力受け材１が固定されており、各水平力受け材１が梁または桁の底面よりも下方に配置されている点で第１実施形態と大きく相違している。
【００２５】
また第２実施形態では、鉛直方向に直立した反力受け材２が水平力受け材１と干渉するのを避けるため、反力受け材２を支持梁材８の上に載置して、支持梁材８の下側にＰＣ鋼線を張設する構成としている。そして、ＰＣ鋼材３に両側から張力を導入することで反力受け材２および支持梁材８がＰＣ鋼材３によって押し上げられ、主梁４の補強箇所が下側から支持される。なお、第２実施形態においても水平力受け材１は必ずしも複数本配置する必要はなく、１本のみ配置する形態であってもよい［図示を省略する］。
【００２６】
＜第３実施形態＞
図５および図６は第３実施形態における既存構造物の補強構造を示した図である。第３実施形態は、各水平力受け材１が梁または桁の底面よりも下方に配置されており、かつＰＣ鋼材３への張力の導入は支持梁材８に設けられた定着部８ａから行なう点で第１実施形態と大きく相違する。この第３実施形態は、例えば橋梁等のように水平力受け材１の両側からＰＣ鋼材３に張力を導入できない場合に適した補強構造である。
【００２７】
第３実施形態では、橋軸方向に延長する３本の水平力受け材１が、橋桁１０の下側にそれぞれ平行に配置されている。各水平力受け材１の両端は、橋脚１１に取り付けられたブラケット１１ａに固定されている。なお、水平力受け材１は必ずしも複数本配置する必要はなく、１本のみ配置する形態であってもよい［図示を省略する］。
【００２８】
橋桁１０の補強箇所の下側には、鉛直方向に直立した反力受け材２が水平力受け材１の間に配置されており、この反力受け材２は橋軸方向直角方向に延長する支持梁材８に載置されている。また支持梁材８の両側面には、ＰＣ鋼材３の定着部８ａが左右１対で複数設けられている。
【００２９】
また各水平力受け材１の両側からは、それぞれ前記支持梁材８に向けてＰＣ鋼材３，３が張設されている。各水平力受け材１につき２本１組で配置されるＰＣ鋼材３，３は、それぞれ一端が水平力受け材１の定着部１ａに固定され、他端が支持梁材８の定着部８ａで固定されている。
【００３０】
第３実施形態では、橋桁１０の下側に位置する支持梁材８の定着部８ａからＰＣ鋼材３，３に張力を導入する。ＰＣ鋼材３，３に張力が導入されることで、反力受け材２および支持梁材８がによって押し上げられ、橋桁１０の補強箇所が下側から支持される。
【００３１】
なお、第３実施形態では、便宜上３本の水平力受け材１を用いる例で説明したが、水平力受け材１は１本または２本でもよく、あるいは４本以上であってもよい［図示を省略する］。
【００３２】
【発明の効果】
本発明における既存構造物の補強構造では、水平力受け材、反力受け材などをアタッチメント的に取り付けて既存構造物の補強を行なうので、ＰＣ鋼材を取り付けるための既存構造物の改造工事を最小限に抑えることができる。
【００３３】
また本発明における既存構造物の補強構造では、張力が導入されたＰＣ鋼材の上に配置された反力受け材によって梁または桁の補強箇所が下側から支持されるので、梁等にかかる積載荷重が相殺され、梁等に作用する曲げモーメントおよびせん断応力が大幅に緩和される効果を奏する。
【００３４】
特に本発明における既存構造物の補強構造では、ＰＣ鋼材の湾曲配置で発生する偏心曲げモーメントを水平力受け材に負担させることで、梁等には偏心曲げモーメントを伝達させずに、上向きの補強荷重のみを反力受け材によって梁等に伝達させている。したがって、本発明ではＰＣ鋼材の端部と中央部の高低差を大きくするようにＰＣ鋼材を配置しても、偏心曲げモーメントを増加させることなくより大きな補強荷重を既存構造物に伝達できるため、従来の既存構造物の補強構造に比べて非常に有利である。
【図面の簡単な説明】
【図１】第１実施形態に係る既存構造物の補強構造の側面図である。
【図２】第１実施形態に係る既存構造物の補強構造の平面図である。
【図３】第２実施形態に係る既存構造物の補強構造の側面図である。
【図４】第２実施形態に係る既存構造物の補強構造の平面図である。
【図５】第３実施形態に係る既存構造物の補強構造の側面図である。
【図６】第３実施形態に係る既存構造物の補強構造の平面図である。
【符号の説明】
１　　水平力受け材
１ａ　定着部
２　　反力受け材
３　　ＰＣ鋼材
４　　主梁
５　　横梁
６　　架台
７　　柱
７ａ　ブラケット
７ｂ　ボルト
８　　支持梁材
８ａ　定着部
１０　橋桁
１１　橋脚
１１ａ　ブラケット
１２　補強荷重
１３　張力[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to reinforcement of an existing structure such as a column-beam structure or a bridge, and particularly to a reinforcement structure capable of efficiently reinforcing a bending moment and a shear force without damaging the existing structure. I will provide a.
[0002]
[Prior art]
In the case of existing columns and bridges, bridges, etc., where reinforcement work is to be performed to increase the load, for example, the cross-sectional performance of columns or beams should be improved by installing cross-section reinforcements or adding concrete. Is common. Since such reinforcement methods mainly involve on-site construction, the construction period tends to be prolonged, and in some cases, temporary removal of the loading load may be required.Therefore, many restrictions are imposed during construction. Sometimes.
[0003]
For this reason, as a method of reinforcing an existing structure inexpensively and in a short period of time, a reinforcing method of installing a reinforcing cable outside a beam material and introducing tension to the reinforcing cable has been actively performed in recent years (for example, Patent Reference 1). In this reinforcing method, anchoring portions of reinforcing cables are provided at both ends of the existing beam, and the eccentric compressive force is introduced in the axial direction of the beam by tensioning the anchoring portion with a reinforcing cable (PC steel) to reduce the stress in the beam. The existing beams are reinforced by offsetting them. In order to effectively reduce the bending moment and the shearing force acting on the beam, the reinforcing cable is often arranged in a bow shape so as to form a downwardly convex shape.
[0004]
In the reinforcing method using the above-described reinforcing cable, the existing beam must be remodeled in a fixing section for fixing the reinforcing cable and a deflection section in which the reinforcing cable bends. However, remodeling of existing beams damages the steel frame, concrete, reinforcing bars, etc., which make up the beams, so their contents are often restricted, and the construction requires careful attention.
[0005]
Therefore, a method of reinforcing an existing beam using a reinforcing cable without modifying a fixing portion of the existing beam has been proposed (for example, see Patent Document 2). However, in the case of Patent Document 2, it is often difficult to install a reinforcing cable. In addition, in the case of Patent Document 2, since the reinforcing cable cannot be arranged in a curved manner, there is much room for improvement in that it does not reinforce the shear force generated in the beam.
[0006]
[Patent Document 1]
JP-A-5-79016 [Patent Document 2]
JP 2001-182153 A
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to minimize a modification of a fixing portion and the like, thereby preventing a bending moment and a shear without damaging an existing structure. Efficient reinforcement against force.
[0008]
[Means for Solving the Problems]
(1) The first invention is a reinforcing structure for an existing structure such as a beam-column structure or a bridge, and includes a horizontal force receiving member 1 extending in the axial direction of the beam or the girder, and a reinforcing portion of the beam or the girder. It is composed of a reaction force receiving material 2 disposed on the lower side, and a PC steel material 3 whose end is fixed to the horizontal force receiving material 1 and is stretched below the reaction force receiving material 2. The reinforcing structure for an existing structure is characterized in that the reaction force receiving member 2 is pushed up by the introduced PC steel material 3 and a reinforcing portion of a beam or a girder is supported from below.
[0009]
(2) In the second invention, in the first invention, each horizontal force receiving member 1 is disposed above the bottom surface of the beam or the girder, and both ends of the PC steel member 3 are provided on the horizontal force receiving member 1. The PC steel material fixed at the fixing portion 1a, and the PC steel material 3 is stretched downward in a convex shape through the lower side of the reaction force receiving material 2, and tension is introduced from both sides of the fixing portion 1a. 3 is characterized in that the reaction force receiving member 2 is supported.
[0010]
(3) In the third invention, in the first invention, each horizontal force receiving member 1 is disposed below a bottom surface of a beam or a girder, and both ends of the PC steel member 3 are provided on the horizontal force receiving member 1. The PC steel member 3 is fixed at the fixing portion 1a, and is stretched in a downwardly convex shape through a lower side of the support beam member 8 on which the reaction force receiving member 2 is placed. The reaction force receiving member 3 and the supporting beam member 8 are supported by the PC steel member 3 to which tension is introduced from both sides.
[0011]
(4) In a fourth aspect based on the first aspect, each horizontal force receiving member 1 is disposed below the bottom surface of the beam or the girder, and the supporting beam member 8 on which the reaction force receiving member 2 is placed, The horizontal force receiving member 1 is supported by a pair of two PC steel members 3 and 3 extending from both sides of the horizontal force receiving member toward the support beam member 8, and the PC steel member is fixed from a fixing portion 8 a of the support beam member 8. Characterized in that tension is introduced into
[0012]
(5) In the fifth invention, in an existing structure such as a beam-column structure or a bridge, after arranging the horizontal force receiving member 1 so as to extend in the axial direction of the beam or the girder, a reinforcing portion of the beam or the girder is formed. The reaction force receiving material 2 is arranged on the lower side, and the PC steel material 3 is stretched below the reaction force receiving material 2, and the end of the PC steel material 3 is fixed to the horizontal force receiving material 1. A method of reinforcing an existing structure, wherein a tension is introduced into the PC steel material 3 to push up the reaction force receiving material 2 to support a reinforcing portion of a beam or a girder from below.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
Hereinafter, a reinforcement structure for an existing structure according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The reinforcement structure of the first embodiment mainly includes a horizontal force receiving member 1, a reaction force receiving member 2, a PC steel material 3 such as a PC steel wire or a PC stranded wire, and a PC steel material 3 into which tension is introduced. Thus, the reaction force receiving member 2 is pushed up, and the load loaded on the main beam 4 is canceled to perform reinforcement.
[0014]
The horizontal force receiving members 1 according to the first embodiment are arranged one on each side of the main beam 4 above the bottom surface of the main beam 4 to be reinforced. The two horizontal force receiving members 1 extend in the axial direction of the main beam 4, and are arranged in parallel so as to sandwich the main beam 4 from both sides. Both ends of each horizontal force receiving member 1 are fixed to a gantry 6 mounted on a horizontal beam 5 orthogonal to the main beam 4. In the vicinity of both ends of each horizontal force receiving member 1, fixing portions 1a for fixing the PC steel member 3 and taking a reaction force are provided. Note that a plurality of horizontal force receiving members 1 do not necessarily need to be arranged, and only one may be arranged [illustration is omitted].
[0015]
The reaction force receiving member 2 is disposed orthogonal to the main beam 4 below the reinforcing portion of the main beam 4. The length of the reaction force receiving member 2 is set to be longer than the width of the main beam 4, and both ends of the reaction force receiving member 2 protrude from both sides of the main beam 4. PC steel members 3 and 3 are stretched below the opposite ends of the reaction force receiving member 2, respectively. That is, as shown in FIG. 1, the reaction force receiving member 2 is disposed between the bottom surface of the reinforcing portion of the main beam 4 and the PC steel member 3. The number of the reaction force receiving members 2 in the present invention is not limited to the illustrated example (two pieces), and the number can be increased or decreased according to the number of reinforcing portions of the main beam 4.
[0016]
A PC steel member 3 to which tension is introduced is curved and stretched below the horizontal force receiving member 1 so as to form a downward convex shape. Both ends of the PC steel member 3 are fixed to fixing portions 1 a provided on the horizontal force receiving member 1, respectively, and are deflected below the reaction force receiving member 2, and are deflected below the reaction force receiving members 2, 2. Are arranged in a downwardly convex shape so as to pass through. When the curvature of the PC steel material 3 is increased, it can be adjusted by increasing the height of the reaction force receiving material 2 or the gantry 6.
[0017]
Here, the reinforcing structure of the first embodiment is constructed, for example, by the following steps.
(A) The gantry 6 is placed on the cross beam 5 protruding from the main beam 4 to be reinforced, and the two horizontal force receiving members 1 are arranged on the gantry 6 so as to be parallel with the main beam 4 interposed therebetween. .
(B) The reaction force receiving member 2 is arranged below the reinforcing portion of the main beam 4, the PC steel member 3 is laid under the reaction force receiving member 2, and both ends of the PC steel member 3 are connected to the horizontal force receiving member 1. It is inserted into the fixing unit 1a.
(C) Then, tension is introduced into the PC steel material 3 from both sides by a jack or the like, and the PC steel material 3 is fixed at the fixing portion 1a. As a result, the reaction force receiving member 2 is pushed up by the PC steel member 3, and the reinforcing portion of the main beam 4 is supported from below.
[0018]
The reinforcing structure of the first embodiment is configured as described above, and its operation will be described below. The reinforcing structure of the first embodiment attaches the horizontal force receiving member 1, the reaction force receiving member 2, and the like as attachments to reinforce the existing structure. Can be minimized.
[0019]
Further, in the reinforcing structure of the first embodiment, the reinforcing portion of the main beam 4 is supported from below by the reaction force receiving member 2 disposed on the PC steel 3 to which the tension is introduced. The load is canceled, and the bending moment and shear stress acting on the main beam 4 are greatly reduced.
[0020]
Here, in order to reduce the shearing force acting on the beam, a PC steel material is curved and arranged in a downwardly convex shape so that a downward reinforcing load is generated at the beam end and an upward reinforcing load is generated at the center of the beam. Is effective reinforcement. If the shearing force is to be further reduced, the difference in height between the end portion and the center portion of the PC steel material may be increased, and the PC steel material may be arranged so as to be greatly curved to increase the reinforcing load. However, in order to increase the curvature of the PC steel, it is necessary to install the anchoring portion of the PC steel on the beam. However, since the bending moment generated by the eccentricity of the PC steel is increased, it is difficult to achieve both. Was.
[0021]
Therefore, in the reinforcing structure of the first embodiment, both ends of the PC steel member 3 are fixed to the horizontal force receiving member 1, and the horizontal force, which is a cause of the eccentric bending moment generated by bending the PC steel member 3, is applied to the horizontal force receiving member 1. Configuration. That is, the horizontal force receiving member 1 independent of the main beam 4 to be reinforced bears the eccentric bending moment, and the eccentric bending moment is not transmitted to the main beam 4, but the upward direction generated by the tension of the PC steel member 3. The reinforcing load is transmitted to the main beam 4 by the reaction force receiving member 2.
[0022]
Therefore, in the reinforcing structure of the first embodiment, even if the PC steel is arranged so that the height difference between the end and the center of the PC steel 3 is increased, a large reinforcing load is applied without increasing the eccentric bending moment. This is very advantageous because it can be transmitted to objects.
[0023]
<Second embodiment>
3 and 4 are views showing a reinforcing structure of an existing structure in the second embodiment. In the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0024]
In the second embodiment, the horizontal force receiving members 1 are fixed on a bracket 7a provided below the main beam 4 of the column 7, and each horizontal force receiving member 1 is disposed below the bottom surface of the beam or the girder. This is greatly different from the first embodiment.
[0025]
Further, in the second embodiment, in order to prevent the reaction force receiving member 2 standing upright in the vertical direction from interfering with the horizontal force receiving member 1, the reaction force receiving member 2 is placed on the support beam member 8 and supported. The PC steel wire is stretched under the beam 8. Then, by introducing tension from both sides to the PC steel member 3, the reaction force receiving member 2 and the supporting beam member 8 are pushed up by the PC steel member 3, and the reinforcing portion of the main beam 4 is supported from below. In the second embodiment, it is not always necessary to arrange a plurality of horizontal force receiving members 1, and a configuration in which only one horizontal force receiving member 1 is arranged may be employed [not shown].
[0026]
<Third embodiment>
5 and 6 are views showing a reinforcing structure of an existing structure in the third embodiment. In the third embodiment, each horizontal force receiving member 1 is disposed below the bottom surface of a beam or a girder, and the introduction of tension to the PC steel member 3 is performed from a fixing portion 8 a provided on a supporting beam member 8. This is greatly different from the first embodiment. The third embodiment is a reinforcement structure suitable for a case where tension cannot be applied to the PC steel member 3 from both sides of the horizontal force receiving member 1 such as a bridge.
[0027]
In the third embodiment, three horizontal force receiving members 1 extending in the bridge axis direction are arranged in parallel below the bridge girder 10, respectively. Both ends of each horizontal force receiving member 1 are fixed to a bracket 11 a attached to the pier 11. Note that a plurality of horizontal force receiving members 1 do not necessarily need to be arranged, and only one may be arranged [illustration is omitted].
[0028]
Below the reinforcing part of the bridge girder 10, a reaction force receiving member 2 that stands upright in the vertical direction is disposed between the horizontal force receiving members 1, and the reaction force receiving member 2 extends in a direction perpendicular to the bridge axis direction. It is placed on the support beam 8. Further, a plurality of fixing portions 8a of the PC steel material 3 are provided on both side surfaces of the support beam material 8 in a pair of right and left.
[0029]
Further, PC steel members 3 are stretched from both sides of each horizontal force receiving member 1 toward the support beam member 8, respectively. One end of each of the PC steel members 3, 3 arranged in pairs for each horizontal force receiving member 1 is fixed to the fixing portion 1 a of the horizontal force receiving member 1, and the other end is a fixing portion 8 a of the support beam member 8. Fixed.
[0030]
In the third embodiment, tension is introduced into the PC steel members 3 from the fixing portion 8a of the support beam member 8 located below the bridge girder 10. By introducing tension into the PC steel members 3, 3, the reaction force receiving member 2 and the supporting beam member 8 are pushed up, and the reinforcing portion of the bridge girder 10 is supported from below.
[0031]
In the third embodiment, an example in which three horizontal force receiving members 1 are used is described for convenience. However, the number of horizontal force receiving members 1 may be one or two, or four or more. Omitted].
[0032]
【The invention's effect】
In the reinforcement structure of the existing structure according to the present invention, the existing structure is reinforced by attaching the horizontal force receiving material, the reaction force receiving material, etc. in an attachment manner, so that the remodeling work of the existing structure for attaching the PC steel material is minimized. Can be minimized.
[0033]
Further, in the reinforcing structure of the existing structure according to the present invention, since the reinforcing portion of the beam or the girder is supported from below by the reaction force receiving member arranged on the tension-introduced PC steel material, the loading on the beam or the like is performed. The load is offset and the bending moment and the shear stress acting on the beam and the like are greatly reduced.
[0034]
In particular, in the reinforcing structure of the existing structure according to the present invention, the eccentric bending moment generated by the curved arrangement of the PC steel is borne by the horizontal force receiving member, so that the eccentric bending moment is not transmitted to the beams and the like, and the upward reinforcement is performed. Only the load is transmitted to the beam or the like by the reaction force receiving member. Therefore, in the present invention, even if the PC steel material is arranged so as to increase the height difference between the end portion and the central portion of the PC steel material, a larger reinforcing load can be transmitted to the existing structure without increasing the eccentric bending moment. This is very advantageous as compared with the conventional existing structure reinforcement structure.
[Brief description of the drawings]
FIG. 1 is a side view of a reinforcement structure of an existing structure according to a first embodiment.
FIG. 2 is a plan view of a reinforcing structure of the existing structure according to the first embodiment.
FIG. 3 is a side view of a reinforcement structure of an existing structure according to a second embodiment.
FIG. 4 is a plan view of a reinforcing structure for an existing structure according to a second embodiment.
FIG. 5 is a side view of a reinforcing structure for an existing structure according to a third embodiment.
FIG. 6 is a plan view of a reinforcing structure for an existing structure according to a third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Horizontal force receiving material 1a Anchoring part 2 Reaction force receiving material 3 PC steel material 4 Main beam 5 Cross beam 6 Stand 7 Column 7a Bracket 7b Bolt 8 Supporting beam material 8a Anchoring part 10 Bridge girder 11 Bridge pier 11a Bracket 12 Reinforcement load 13 Tension

Claims (5)

柱梁構造物、橋梁などの既存構造物の補強構造であって、梁または桁の軸方向に延長する水平力受け材と、梁または桁の補強箇所の下側に配置された反力受け材と、前記水平力受け材に端部が固定され、かつ前記反力受け材の下側に張設されたＰＣ鋼材とからなり、張力が導入された前記ＰＣ鋼材によって前記反力受け材が押し上げられて、梁または桁の補強箇所が下側から支持されることを特徴とする既存構造物の補強構造。Reinforcement structure for existing structures such as column and beam structures, bridges, etc., where a horizontal force receiving member extends in the axial direction of the beam or girder, and a reaction force receiving member disposed below the reinforcing portion of the beam or girder And a PC steel material having an end fixed to the horizontal force receiving material and stretched below the reaction force receiving material, and the tension-introduced PC steel material pushes up the reaction force receiving material. A reinforcing structure for an existing structure, wherein a reinforcing portion of a beam or a girder is supported from below. 各水平力受け材は梁または桁の底面よりも上方に配置され、ＰＣ鋼材の両端は前記水平力受け材に設けられた定着部で固定されており、かつ前記ＰＣ鋼材は反力受け材の下側を経て下向き凸形状に張設されており、前記定着部の両側から張力が導入された前記ＰＣ鋼材によって反力受け材が支持されることを特徴とする請求項１に記載の既存構造物の補強構造。Each horizontal force receiving member is disposed above the bottom surface of the beam or the girder, both ends of the PC steel are fixed by fixing portions provided on the horizontal force receiving member, and the PC steel is a reaction force receiving member. 2. The existing structure according to claim 1, wherein a reaction force receiving member is supported by the PC steel to which tension is introduced from both sides of the fixing unit, the tension receiving member being stretched downward through a lower side. 3. Reinforcement structure for objects. 各水平力受け材は梁または桁の底面よりも下方に配置され、ＰＣ鋼材の両端は前記水平力受け材に設けられた定着部で固定されており、かつ前記ＰＣ鋼材は、反力受け材が載置された支持梁材の下側を経て下向き凸形状に張設されており、前記定着部の両側から張力が導入された前記ＰＣ鋼材によって反力受け材および支持梁材が支持されることを特徴とする請求項１に記載の既存構造物の補強構造。Each horizontal force receiving member is disposed below the bottom surface of the beam or the girder, both ends of the PC steel are fixed by fixing portions provided on the horizontal force receiving member, and the PC steel is a reaction force receiving member. Is stretched downward in a convex shape through the lower side of the supporting beam material on which the supporting member is placed, and the reaction force receiving material and the supporting beam material are supported by the PC steel material to which tension is introduced from both sides of the fixing portion. The reinforcing structure for an existing structure according to claim 1, wherein: 各水平力受け材は梁または桁の底面よりも下方に配置され、反力受け材が載置される支持梁材は、前記水平力受け材の両側から前記支持梁材に向けて張設された２本１組のＰＣ鋼材で支持されており、前記支持梁材の定着部から前記ＰＣ鋼材に張力が導入されることを特徴とする請求項１に記載の既存構造物の補強構造。Each horizontal force receiving member is disposed below the bottom of the beam or the girder, and the supporting beam on which the reaction force receiving member is placed is stretched from both sides of the horizontal force receiving member toward the supporting beam. 2. The reinforcing structure for an existing structure according to claim 1, wherein the reinforcing member is supported by a pair of PC steel members, and tension is introduced into the PC steel member from a fixing portion of the support beam member. 3. 柱梁構造物、橋梁などの既存構造物において、水平力受け材を梁または桁の軸方向に延長するように配置した後、梁または桁の補強箇所の下側に反力受け材を配置し、かつＰＣ鋼材を前記反力受け材の下側に張設して、前記ＰＣ鋼材の端部を前記水平力受け材に固定して、前記ＰＣ鋼材に張力を導入することで前記反力受け材を押し上げて、梁または桁の補強箇所を下側から支持することを特徴とする既存構造物の補強方法。In existing structures such as column and beam structures, bridges, etc., after arranging the horizontal force receiving members so as to extend in the axial direction of the beams or girders, place the reaction force receiving members below the reinforcement of the beams or girders. And, a PC steel material is stretched under the reaction force receiving material, an end of the PC steel material is fixed to the horizontal force receiving material, and tension is introduced into the PC steel material to thereby receive the reaction force receiving material. A method for reinforcing an existing structure, comprising raising a material and supporting a reinforcing portion of a beam or a girder from below.
JP2002279587A 2002-09-25 2002-09-25 Reinforcement structure and reinforcement method for existing structures Expired - Fee Related JP3867037B2 (en)

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