JP2004316320A - Method of reinforcing borehole peripheral part for existing concrete structure - Google Patents

Method of reinforcing borehole peripheral part for existing concrete structure Download PDF

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Publication number
JP2004316320A
JP2004316320A JP2003113941A JP2003113941A JP2004316320A JP 2004316320 A JP2004316320 A JP 2004316320A JP 2003113941 A JP2003113941 A JP 2003113941A JP 2003113941 A JP2003113941 A JP 2003113941A JP 2004316320 A JP2004316320 A JP 2004316320A
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Japan
Prior art keywords
fiber
reinforced plastic
reinforcing
plastic molded
molded plate
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JP2003113941A
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Japanese (ja)
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JP3761871B2 (en
Inventor
Kazumichi Oya
和道 大家
Keiichiro Tani
圭一郎 谷
Tetsuya Sugiyama
哲也 杉山
Tetsuo Higuchi
哲郎 樋口
Yasutoshi Shimizu
康敏 清水
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokyo Gas Co Ltd
Nippon Steel Chemical and Materials Co Ltd
Tosetz Co Ltd
Toho Earthtech Inc
Original Assignee
Nippon Steel Composite Co Ltd
Tokyo Gas Co Ltd
Tosetz Co Ltd
Toho Earthtech Inc
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Application filed by Nippon Steel Composite Co Ltd, Tokyo Gas Co Ltd, Tosetz Co Ltd, Toho Earthtech Inc filed Critical Nippon Steel Composite Co Ltd
Priority to JP2003113941A priority Critical patent/JP3761871B2/en
Publication of JP2004316320A publication Critical patent/JP2004316320A/en
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  • Working Measures On Existing Buildindgs (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of reinforcing a borehole peripheral part for an existing concrete structure having excellent workability, obtaining a reinforcing effect of high quality regardless of the construction skill of a constructor and securing a sufficient reinforcing effect even with a change in surrounding environment. <P>SOLUTION: In the method of reinforcing a peripheral part 1b of a borehole 1a formed after laying for a skeleton 1 of the existing concrete structure, a fiber reinforced plastic molded plate 10 having an opening 10a including at least the borehole 1a and having a fiber layer laminated so that at least the intersecting directions of fiber are symmetric with respect to the center cross section in a plate thickness direction, is used, and the opening 10a is adjusted to the borehole 1a to stick the fiber reinforced plastic molded plate 10 to the peripheral part 1b through an adhesive. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、既設のコンクリート構造物に対して、敷設後に形成された穿孔の周辺部を補強する補強工法に関するものである。
【0002】
【従来の技術】
既設のコンクリート構造物に対して、使用状況の変更や付属設備の増設等の理由で、構造物の躯体(壁等)に貫通孔を形成する場合がある。壁等の躯体を敷設後に穿孔すると、孔の周辺部にはせん断力等による局部的な応力集中や断面欠損による躯体耐力の低下が起こるので、これがひび割れの発生原因になる。躯体にひび割れが生じると、それが非構造壁であったとしても、躯体が担保している防火機能,防水機能,防音機能等の機能が損なわれることになるので、ひび割れが発生しないように孔の周辺部を補強することが必要になる。
【0003】
このような穿孔周辺部の補強としては、従来より、穿孔周辺部の躯体表面の両側に鋼板を接着させる工法が行われている。しかしながら、このような工法によると、重量の大きい鋼板を躯体表面に接着するので、垂直壁等を対象躯体とする場合には、接着剤が硬化するまでアンカー等による架設を必要とし、施工が大掛かりになると共に、接着剤が硬化するまでの養生期間中は架設が邪魔になって周辺部の作業に支障をきたすという問題がある。また、鋼板による補強では、鋼板の厚みやアンカーボルトにより突起物が大きくなり、対象躯体の周辺状況が極度に変わってしまい、外観及び周辺スペースの確保に問題が生じる。
【0004】
そこで、鋼板よりも軽量の繊維強化プラスチックを用いる工法が提案されている(下記特許文献1参照)。この工法は、コンクリート構造物に開けた、例えば設備配管のための貫通孔の周辺に対して、その表面に下地処理を施した後にエポキシ系の接着剤を塗布し、コンクリート構造物に開けた孔に整合した開口を有するプラスチックシートを貼り付けるというものである。この工法は、一方向に繊維を配列した繊維強化プラスチックシートを、繊維方向が交差するように、施工現場で穿孔周辺部に貼り合わせ、プラスチックシートの貼り付けが完了した後にその表面に硬化剤を塗布して繊維強化プラスチックシートを硬化させるものである。
【0005】
【特許文献1】
特開平9−125601号公報
【0006】
【発明が解決しようとする課題】
前述した繊維強化プラスチックシートを用いる工法では、施工現場で繊維の交差角度等を調整しながら貼り付け作業を行うことになるので、現場での作業が煩雑になり施工性が悪く、また施工者によって品質にばらつきが生じやすいという問題がある。
【0007】
この問題に対処するためには、予め成形された繊維強化プラスチック板を用いることが考えられる。一般に繊維強化プラスチック板は、力学的特性が繊維の方向によって異なっているので、板の面外方向への曲げ特性を直交する2つの曲げ方向に対して等しくするために、例えば、繊維方向が0°/90°の2層構造にする等して、最外層の繊維方向が直交するように配列されている。しかしながら、このような曲げ特性に着目して最外層の繊維方向が直交する配列の繊維強化プラスチック板を用いた場合には、一般に繊維の熱膨張係数が軸方向とその直交方向で異なるので、温度変化によって板に反りが生じ易くなる。
【0008】
穿孔周辺部の補強工法において、このように熱的な変形(反り)が生じ易いものを採用した場合は、周囲の温度変化に対して板に反りが生じて接着状態の劣化を招き、充分な補強効果が得られなくなるという問題が生じる。特に、空調施設の吸排気ダクト等を敷設するための孔をコンクリート構造物の躯体に形成する場合には、その周辺にある程度の温度変化が生じることは覚悟せざるを得ないので、板の熱的特性の考慮無しでは充分な補強効果が得られなくなる。また、日中と夜間の気温差が大きい地域や季節的な気温差が大きい地域などで、外壁面に前述の補強を施す場合なども経時的な板の変形によって充分な補強効果が得られなくなる。
【0009】
本発明は、このような問題に対処するために提案されたものであって、施工性が良好で、施工者の施工熟練度に拘わらず高品質の補強効果が得られ、しかも、周辺環境の変化に対しても充分な補強効果を確保することが可能な既設コンクリート構造物に対する穿孔周辺部補強工法を提供することを目的とするものである。
【0010】
【課題を解決するための手段】
このような目的を達成するために、本発明に係る既設コンクリート構造物に対する穿孔周辺部補強工法は、以下の各請求項に係る特徴を具備するものである。
【0011】
請求項1に係る発明は、既設のコンクリート構造物に対して、敷設後に形成された穿孔の周辺部を補強する工法であって、前記穿孔を少なくとも内包する開口を有し、周辺環境変化に対して平坦性を維持する繊維強化プラスチック成形板を用い、前記開口を前記穿孔に合わせて、前記繊維強化プラスチック成形板を接着剤を介して前記周辺部に貼り付けることを特徴とする。
【0012】
請求項2に係る発明は、既設のコンクリート構造物に対して、敷設後に形成された穿孔の周辺部を補強する工法であって、前記穿孔を少なくとも内包する開口を有し、少なくとも繊維の交差方向が板厚方向中央断面に対して対称となるように積層された繊維層を有する繊維強化プラスチック成形板を用い、前記開口を前記穿孔に合わせて、前記繊維強化プラスチック成形板を接着剤を介して前記周辺部に貼り付けることを特徴とする。
【0013】
請求項3に係る発明は、請求項1又は2に記載された既設コンクリート構造物に対する穿孔周辺部補強工法において、前記繊維強化プラスチック成形板は偶数の繊維層からなることを特徴とする。
【0014】
請求項4に係る発明は、請求項1又は2に記載された既設コンクリート構造物に対する穿孔周辺部補強工法において、前記繊維強化プラスチック成形板は3層の繊維層からなり、最外層が同方向に配列された繊維層であり、中央層がそれと異なる方向に配列されると共に繊維量を前記最外層の2倍にした繊維層であることを特徴とする。
【0015】
請求項5に係る発明は、請求項1〜4のいずれかに記載された既設コンクリート構造物に対する穿孔周辺部補強工法において、前記繊維強化プラスチック成形板を前記周辺部の片面のみに貼り付けることを特徴とする。
【0016】
このような特徴を有する各請求項に係る発明によると、以下の作用を得ることができる。
【0017】
既設コンクリート構造物においては、敷設後の穿孔行為によって躯体に孔を設けた場合には、穿孔周辺部にはせん断力等による局部的な応力集中や断面欠損による耐力の低下が起こり、これがひび割れの発生原因となるが、穿孔周辺部に開口を有する繊維強化プラスチック成形板を接着剤を介して貼り付けることにより、穿孔前に対象躯体が有していた耐力に近い耐力を保持する補強効果が得られる。
【0018】
そして本発明によると、第1には、周辺環境変化に対して平坦性を維持する繊維強化プラスチック成形板を用いるので、施工現場での作業を簡略化することができ、施工者の熟練度合いに拘わらず高品質の補強効果を得ることができ、また経時的にも安定した補強効果を維持することができる。そして、軽量の繊維強化プラスチック成形板を穿孔の周辺部に貼り付けるので、特にアンカー等の架設を設ける必要が無く、接着剤が硬化する養生期間中にも補強箇所の周辺は開放されており、他の作業を並行して行うことができる。
【0019】
第2には、少なくとも繊維の交差方向が板厚方向中央断面に対して対称となるように積層された繊維層を有する繊維強化プラスチック成形板を用いるので、熱膨張に対しても成形板の平坦性を維持することができる。これによって前述した作用を得ることができる。
【0020】
第3には、繊維強化プラスチック成形板を偶数の繊維層からなるものにすることで、積層面を板厚方向中央断面にして簡単に対称の繊維層積層構造を得ることができる。これによって前述した作用を得ることができる。
【0021】
第4には、繊維強化プラスチック成形板は3層の繊維層からなり、最外層が同方向に配列された繊維層であり、中央層を最外層と異なる方向に配列すると共に繊維量を2倍にした繊維層にしたので、中央層の真ん中の断面を板厚方向中央断面にして対称の繊維層積層構造を得ることができる。これによって前述した作用を得ることができる。
【0022】
第5には、繊維強化プラスチック成形板を穿孔周辺部の片面のみに貼り付けるので、作業を簡単に行うことができると共に、片面のみでしか作業を行うことができない状況下でも施工が可能であり適用範囲の限定が少なくなる。特に、建物の外壁を対象躯体とする場合には、室外側のみに繊維強化プラスチック成形板を貼り付ければ足りるので、室内に影響なく施工を完了させることができ、また、建物外壁の外側からの作業ができないような場合には、室内側のみに繊維強化プラスチック成形板を貼り付けることで十分な対応が可能になる。そして、対象躯体を穿孔前と同程度の耐力に回復させる補強を目的とした場合には、穿孔周辺部の片面のみに繊維強化プラスチック成形板を貼り付けることで充分達成可能であり、前述した第1乃至第3の特徴と併せることで、有効性の高い補強を行うことができる。
【0023】
【発明の実施の形態】
以下、本発明の実施形態を図面を参照して説明する。図1は、本発明の実施形態に係る補強工法の概要を示す説明図である。この実施形態に係る補強工法では、コンクリート構造物の壁等の躯体1に対して、ダイヤモンドコアドリル等を使って穿孔を行い、孔1aを形成した後に、穿孔周辺部1bのひび割れ等を防止するために、躯体1表面片側の穿孔周辺部1bに、孔1bに合わせた開口10aを有する繊維強化プラスチック成形板10を貼り付けるものである。開口10aの大きさは、孔1bと合致した大きさであってもよいし、それより大きく、少なくとも孔1bを内包する大きさであればよい。
【0024】
繊維強化プラスチック成形板10は、予め強化繊維(例えば炭素繊維)に樹脂を含浸させて硬化させた成形板であって、成形後に穿孔予定の孔1aに応じて機械加工により開口10aを形成したものである。このような成形板を用いることで、特に従来の繊維強化プラスチックシートを用いる場合と比較して、施工現場での貼り付け作業が容易になり、施工者による品質のばらつきが少なくなるという利点がある。更には、繊維に含浸させる樹脂量が一定にコントロールされているので、成形後の板厚が一定になっており、成形後に機械加工により予め開口を形成しているので、施工現場で整寸する必要も無い。よって仕上がりの美観が良好であると共に施工性が良好であるという利点もある。
【0025】
そして、本発明の実施形態における繊維強化プラスチック成形板10は、周辺環境変化に対して平坦性を維持する構造を採用している。例えば、複数の積層された繊維層を有しており、各繊維層の繊維方向が図2に示すような交差方向に配列されている。
【0026】
同図(a)に示す実施形態では、繊維層S01,S02,S03,S04の4層(偶数層)構造のものを採用しており、各繊維層の繊維配列方向を0°/90°/90°/0°にしている。これによって、最外層S01,S04は同方向に配列された繊維層であり、中央の積層境界面Oを板厚方向中央断面として、この面に対して繊維配列の交差方向が対称な構造になっている。
【0027】
このような構造の繊維強化プラスチック成形板10を用いると、表裏両面が同様の熱膨張特性を示すので、温度変化に対しても反りが生じることがない。したがって、周辺環境変化に対して平坦性を維持する繊維強化プラスチック成形板を得ることができる。
【0028】
また、このような構造の繊維強化プラスチック成形板10は、紙面に垂直な軸回りの曲げ(図示矢印方向の曲げ)の曲げ剛性がそれと垂直な方向の曲げ剛性より小さい(1/4〜1/7倍)特性を有している。これによると、図示矢印方向に繊維強化プラスチック成形板10を曲げることによって簡単に板を湾曲させることができる。これを利用して、繊維強化プラスチック成形板10を湾曲させた状態で一部を貼り付け、徐々に板を平坦にしながら全体を貼り付けることで、接着剤中の気泡を追い出しながら高品質の貼り付けを行うことが可能になる。
【0029】
同図(b)に示す実施形態では、繊維層S11,S12,S13の3層構造のものを採用しており、各繊維層の繊維配列方向を0°/90°/0°にしていると共に中央の繊維層S12の繊維量αを最外層S11,S13の2倍(2α)に設定している。これによって、最外層S11,S13は同方向に配列された繊維層であり、中央の繊維層S12の中央断面Oを板厚方向中央断面として、この面に対して繊維配列の交差方向及び繊維量が対称な構造になっている。
【0030】
また、同図(c)に示す実施形態では、繊維層S21,S22,S23,S24,S25,S26,S27,S28の8層(偶数層)構造のものを採用しており、各繊維層の繊維配列方向を0°/0°/90°/90°/90°/90°/0°/0°にしている。これによって、最外層S21,S28は同方向に配列された繊維層であり、中央の積層境界面Oを板厚方向中央断面として、この面に対して繊維配列の交差方向が対称な構造になっている。
【0031】
これらの実施形態によっても、前述の実施形態と同様に、表裏両面が同様の熱膨張特性を示すので、温度変化に対しても反りが生じることがなく、また、図示矢印方向に繊維強化プラスチック成形板を曲げることによって簡単に板を湾曲させることができるので、接着剤中の気泡を追い出しながら高品質の貼り付けを行うことが可能になる。
【0032】
図3は、本発明の実施形態に係る補強工法の作業手順を示すフローである。図1の記載と併せて作業手順を説明する。穿孔(コア抜き)工事は、コンクリート構造物内の鉄筋探知を行った後、鉄筋の無い部分を選択し、ダイヤモンドコアドリル等を使用して対象躯体に貫通孔を開ける(P)。そして、穿孔周辺部1bのコンクリート表面(下地)をサンダーケレン等により平滑で脆弱部や汚れのない状態に下地処理する(P)。その後、繊維強化プラスチック成形板10の貼り付け位置を墨だしし、繊維強化プラスチック成形板10の接着面に接着剤(エポキシ樹脂接着剤等)を均一厚さ塗布し、更に、下地の墨だし位置に、接着剤(エポキシ樹脂接着剤等)を均一厚さに塗布する(P)。次に、繊維強化プラスチック成形板10を湾曲させた状態で、端の一部を下地に貼り付け、除去に平坦に戻しながら全体を下地上に貼り付ける(P)。この際、接着剤から気泡を押し出すように貼り付けることで、接着層内に空間ができるのを防ぐことができる。その後は、接着剤が硬化するまで養生を行い(P)、施工周辺部の清掃等を行って作業を完了する(P)。
【0033】
【実施例】
以下に、本発明の更に具体的な実施例を説明する。
【0034】
[繊維強化プラスチック成形板]炭素繊維強化プラスチック板(CFRP板)をオートクレーブ成形法で成形し、繊維層の配列を0°/90°/90°/0°(図2(a)参照)とした。成形板の仕様としては、繊維目付け150g/m、樹脂含有率35wt%、板厚0.6mmとした。外径寸法は400mm×400mmで、開口径は、第1例では穿孔径125φに合わせて125φとし、第2例では穿孔径125φに対してこれを内包する200φとした。
【0035】
[接着剤]接着剤としては、臭気が気にならない、樹脂だれが少ない(グリース状)、硬化時間が短いものが適する。これらを満足する接着剤として、主剤:ビスフェノールA型エポキシ樹脂,硬化剤:変性脂環式ポリアミンからなるエポキシ樹脂接着剤(製品名:トーホーダイトCP471)を採用することができる。
【0036】
[性能試験]コンクリート構造物の試験片(コンクリート調合強度18N/mm,縦:600mm×横:600mm×厚さ:150mm,シングル配筋3本)を用い、穿孔形成する場合には、中央の鉄筋を切断した状態で125φの孔を形成し、表1の各試験体に対して、3本の鉄筋を支持してロードセルによる引張荷重試験を行った。試験結果を表2及び図4に示す。
【0037】
【表1】

Figure 2004316320
【0038】
【表2】
Figure 2004316320
【0039】
図4は、同図(a)に試験体A,試験体B,試験体Cの測定結果を示しており、同図(b)に試験体Dの試験結果を示している。これらの結果から明らかなように、試験体Aと試験体Cとの比較では、穿孔と合致した開口を有する炭素繊維強化プラスチック成形板を貼ることによって、初期ひび割れ発生荷重が45%向上し、また、補強を施さない試験体Cでは、初期ひび割れ発生後95kN付近で鉄筋の降伏点に達した(C2)のに対して、補強を施した試験体Aでは、139kNまで耐力を保持することができる(A2)。また、試験体Bと試験体Cとの比較では、穿孔に対してこれを内包するような若干大きい開口を有する繊維強化プラスチック成形板を貼ることによっても同様の補強効果が得られることがわかる。
【0040】
そして、穿孔に対して補強を施した場合(試験体A,試験体B)には、穿孔を形成しなかった場合(試験体D)と比較しても、初期ひび割れ発生荷重が85〜90%くらいまで回復していることが分かる。この際比較対象の試験体Dでは、鉄筋の切断が為されていないので、両者に差が生じるのは当然であるが、初期ひび割れ発生の防止という観点では充分な補強効果が得られていることが確認できる。
【0041】
【発明の効果】
本発明はこのように構成されるので、施工性が良好で、施工者の施工熟練度に拘わらず高品質の補強効果が得られ、しかも、周辺環境の変化に対しても充分な補強効果を確保することが可能な既設コンクリート構造物に対する穿孔周辺部補強工法を提供することができる。
【図面の簡単な説明】
【図1】本発明の実施形態に係る補強工法の概要を示す説明図である。
【図2】本発明の実施形態に係る繊維強化プラスチック成形板を示す説明図である。
【図3】本発明の実施形態に係る補強工法の作業手順を示すフローである。
【図4】実施例の試験結果を示すグラフである。
【符号の説明】
1 躯体
1a 孔
1b 穿孔周辺部
10 繊維強化プラスチック成形板
10a 開口[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a reinforcing method for reinforcing an existing concrete structure around a perforation formed after laying.
[0002]
[Prior art]
For existing concrete structures, through-holes may be formed in the skeleton (walls, etc.) of the structure for reasons such as a change in use conditions or an increase in attached facilities. If a hole such as a wall is pierced after being laid, local stress concentration due to shearing force or the like occurs at the periphery of the hole, or a decrease in the proof strength of the frame due to a cross-sectional defect occurs, which causes cracking. If a crack occurs in the frame, even if it is a non-structural wall, the fire protection, waterproofing, and soundproofing functions provided by the frame will be impaired. Needs to be reinforced.
[0003]
Conventionally, as a method for reinforcing the periphery of the perforation, a method of bonding steel plates to both sides of the surface of the skeleton at the periphery of the perforation has been performed. However, according to such a construction method, a heavy steel plate is bonded to the surface of the skeleton, so when vertical walls or the like are to be used as the target skeleton, erection with an anchor or the like is required until the adhesive is cured, which requires a large amount of work. At the same time, during the curing period until the adhesive is cured, there is a problem that the erection is in the way and hinders the operation of the peripheral part. In addition, in the case of reinforcing with a steel plate, the projections become large due to the thickness of the steel plate and anchor bolts, and the situation around the target skeleton is extremely changed, which causes a problem in securing the appearance and surrounding space.
[0004]
Therefore, a construction method using a fiber reinforced plastic lighter than a steel plate has been proposed (see Patent Document 1 below). This method involves applying an epoxy-based adhesive to the surface of a concrete structure, for example, around a through hole for equipment piping, after applying a surface treatment to the surface of the hole, and opening the hole in the concrete structure. A plastic sheet having an opening matched to the above is attached. In this method, a fiber-reinforced plastic sheet in which fibers are arranged in one direction is attached to the periphery of the perforation at the construction site so that the fiber directions intersect, and after the attachment of the plastic sheet is completed, a curing agent is applied to the surface. It is applied to cure the fiber reinforced plastic sheet.
[0005]
[Patent Document 1]
JP-A-9-125601
[Problems to be solved by the invention]
In the above-mentioned method using a fiber reinforced plastic sheet, since the sticking work is performed while adjusting the crossing angle of the fiber at the construction site, the work on the site becomes complicated, the workability is poor, and depending on the constructor, There is a problem that quality tends to vary.
[0007]
In order to cope with this problem, it is conceivable to use a fiber-reinforced plastic plate formed in advance. Generally, a fiber-reinforced plastic plate has different mechanical properties depending on the direction of the fiber. Therefore, in order to make the bending characteristics in the out-of-plane direction of the plate equal to two orthogonal bending directions, for example, the fiber direction is set to 0. The outermost layers are arranged so that the fiber directions are orthogonal to each other by, for example, a two-layer structure of ° / 90 °. However, in the case where a fiber reinforced plastic plate having an arrangement in which the fiber directions of the outermost layer are orthogonal to each other is used in view of such bending characteristics, the thermal expansion coefficient of the fibers is generally different between the axial direction and the orthogonal direction. The change tends to warp the plate.
[0008]
In the method of reinforcing the perimeter of the perforation, if a material that is susceptible to thermal deformation (warpage) is used, the plate is warped in response to a change in ambient temperature, causing deterioration of the bonding state, and There is a problem that the reinforcing effect cannot be obtained. In particular, when holes for laying air intake and exhaust ducts for air conditioning facilities are formed in the concrete structure body, it is necessary to be aware that a certain degree of temperature change will occur around it, so the heat Without consideration of the mechanical properties, a sufficient reinforcing effect cannot be obtained. In addition, when the above-mentioned reinforcement is applied to the outer wall surface in a region where the temperature difference between daytime and nighttime is large or a region where the seasonal temperature difference is large, a sufficient reinforcing effect cannot be obtained due to the deformation of the plate over time. .
[0009]
The present invention has been proposed in order to address such a problem, and has good workability, a high-quality reinforcing effect can be obtained irrespective of the construction skill of the installer, and moreover, the surrounding environment can be improved. An object of the present invention is to provide a method of reinforcing a perimeter of an existing concrete structure capable of securing a sufficient reinforcing effect against changes.
[0010]
[Means for Solving the Problems]
In order to achieve such an object, a method for reinforcing a perimeter of an existing concrete structure according to the present invention has the features according to the following claims.
[0011]
The invention according to claim 1 is a construction method for reinforcing a peripheral portion of a perforation formed after laying, for an existing concrete structure, the method including an opening including at least the perforation, and preventing a change in the surrounding environment. A fiber-reinforced plastic molded plate which maintains flatness by adjusting the openings to the perforations, and affixes the fiber-reinforced plastic molded plate to the peripheral portion via an adhesive.
[0012]
The invention according to claim 2 is a method for reinforcing a peripheral portion of a perforation formed after the existing concrete structure is laid, the method including an opening including at least the perforation, and at least a crossing direction of fibers. Using a fiber reinforced plastic molded plate having a fiber layer laminated so as to be symmetrical with respect to the plate thickness direction center cross section, aligning the opening with the perforation, the fiber reinforced plastic molded plate via an adhesive It is characterized in that it is attached to the peripheral part.
[0013]
According to a third aspect of the present invention, in the method of reinforcing a perforated portion of an existing concrete structure according to the first or second aspect, the fiber-reinforced plastic molded plate comprises an even number of fiber layers.
[0014]
According to a fourth aspect of the present invention, in the method for reinforcing a perimeter of an existing concrete structure according to the first or second aspect, the fiber-reinforced plastic molded plate comprises three fiber layers, and an outermost layer is formed in the same direction. It is a fiber layer in which the central layer is arranged in a different direction from the central layer and the fiber amount is twice that of the outermost layer.
[0015]
According to a fifth aspect of the present invention, in the method for reinforcing a peripheral portion of an existing concrete structure according to any one of the first to fourth aspects, the fiber-reinforced plastic molded plate is attached to only one surface of the peripheral portion. Features.
[0016]
According to the invention having the above features, the following effects can be obtained.
[0017]
In existing concrete structures, if holes are formed in the skeleton by drilling after laying, local stress concentration due to shearing force etc. at the periphery of the drilling and reduction in proof stress due to cross-sectional defects occur, which causes cracks. As a cause of the occurrence, by attaching a fiber-reinforced plastic molded plate with openings around the perforation via an adhesive, a reinforcing effect to maintain the proof stress close to the proof stress of the target frame before perforation is obtained. Can be
[0018]
According to the present invention, firstly, since a fiber-reinforced plastic molded plate that maintains flatness against changes in the surrounding environment is used, the work at the construction site can be simplified, and the skill of the installer can be reduced. Regardless, a high-quality reinforcing effect can be obtained, and a stable reinforcing effect can be maintained over time. And, since a lightweight fiber-reinforced plastic molded plate is attached to the periphery of the perforation, there is no need to provide a bridge such as an anchor, and the periphery of the reinforcement is open even during the curing period when the adhesive cures. Other tasks can be performed in parallel.
[0019]
Secondly, since a fiber-reinforced plastic molded plate having a fiber layer laminated so that at least the crossing direction of the fibers is symmetrical with respect to the central cross section in the thickness direction is used, the molded plate is flat against thermal expansion. Sex can be maintained. Thereby, the above-described operation can be obtained.
[0020]
Third, by forming the fiber-reinforced plastic molded plate from an even number of fiber layers, a symmetric fiber layer laminated structure can be easily obtained with the lamination surface being a center cross section in the plate thickness direction. Thereby, the above-described operation can be obtained.
[0021]
Fourth, the fiber-reinforced plastic molded plate is composed of three fiber layers, the outermost layer being a fiber layer arranged in the same direction, the center layer being arranged in a different direction from the outermost layer, and doubling the fiber amount. Since the fiber layer is formed as described above, a symmetric fiber layer laminated structure can be obtained by setting the middle section of the center layer to the center section in the plate thickness direction. Thereby, the above-described operation can be obtained.
[0022]
Fifth, since the fiber-reinforced plastic molding plate is stuck on only one surface of the periphery of the perforation, work can be performed easily, and construction is possible even in a situation where work can be performed only on one surface. The scope of application is less limited. In particular, when the outer wall of the building is to be used as the target skeleton, it is sufficient to attach a fiber-reinforced plastic molded plate only to the outside of the building, so that the construction can be completed without affecting the room, and In the case where work cannot be performed, a sufficient measure can be taken by attaching a fiber-reinforced plastic molded plate only to the indoor side. In the case where the purpose is to reinforce the target skeleton to recover to the same strength as before the drilling, it can be sufficiently achieved by attaching a fiber-reinforced plastic molded plate only to one surface of the peripheral portion of the drilling. In combination with the first to third features, highly effective reinforcement can be performed.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an outline of a reinforcing method according to an embodiment of the present invention. In the reinforcing method according to this embodiment, a hole 1a is formed in a skeleton 1 such as a wall of a concrete structure using a diamond core drill or the like, and after the hole 1a is formed, cracks in a peripheral portion 1b of the hole are prevented. Then, a fiber-reinforced plastic molded plate 10 having an opening 10a corresponding to the hole 1b is attached to a perforated peripheral portion 1b on one side of the body 1 surface. The size of the opening 10a may be the same as the size of the hole 1b, or may be larger than that and at least include the hole 1b.
[0024]
The fiber-reinforced plastic molded plate 10 is a molded plate obtained by impregnating a reinforcing fiber (for example, carbon fiber) with a resin in advance and curing the resin, and has an opening 10a formed by machining according to a hole 1a to be drilled after molding. It is. By using such a molded plate, there is an advantage that, in comparison with a case where a conventional fiber-reinforced plastic sheet is used, the attaching work at the construction site is facilitated, and the variation in quality by the constructor is reduced. . Furthermore, since the amount of resin impregnated into the fiber is controlled to be constant, the thickness of the sheet after molding is constant, and since the opening is formed in advance by machining after molding, the dimensions are set at the construction site. No need. Therefore, there is an advantage that the aesthetic appearance of the finish is good and the workability is good.
[0025]
The fiber-reinforced plastic molded plate 10 according to the embodiment of the present invention employs a structure that maintains flatness against changes in the surrounding environment. For example, it has a plurality of laminated fiber layers, and the fiber direction of each fiber layer is arranged in a cross direction as shown in FIG.
[0026]
In the embodiment shown in FIG. 3A, a four-layer (even number layer) structure of fiber layers S 01 , S 02 , S 03 , and S 04 is adopted, and the fiber arrangement direction of each fiber layer is set to 0 °. / 90 ° / 90 ° / 0 °. As a result, the outermost layers S 01 and S 04 are fiber layers arranged in the same direction, and the crossing direction of the fiber arrangement is symmetric with respect to the center lamination boundary surface O 0 as the central section in the plate thickness direction. It has a structure.
[0027]
When the fiber-reinforced plastic molded plate 10 having such a structure is used, the front and back surfaces exhibit the same thermal expansion characteristics, so that warpage does not occur even when the temperature changes. Therefore, it is possible to obtain a fiber-reinforced plastic molded plate that maintains flatness against changes in the surrounding environment.
[0028]
Further, in the fiber-reinforced plastic molded plate 10 having such a structure, the bending rigidity in the bending around the axis perpendicular to the paper surface (bending in the direction of the arrow in the drawing) is smaller than the bending rigidity in the direction perpendicular thereto (1 / to 1/1). 7 times). According to this, by bending the fiber reinforced plastic molded plate 10 in the direction of the arrow shown in the figure, the plate can be easily curved. By utilizing this, a part of the fiber-reinforced plastic molded plate 10 is pasted in a curved state, and the whole is pasted while gradually flattening the plate. Can be attached.
[0029]
In the embodiment shown in FIG. 2B, a three-layer structure of fiber layers S 11 , S 12 , and S 13 is employed, and the fiber arrangement direction of each fiber layer is set to 0 ° / 90 ° / 0 °. and has set fiber amount α of the center of the fiber layer S 12 to 2 times the outermost S 11, S 13 (2α) with which. As a result, the outermost layers S 11 and S 13 are fiber layers arranged in the same direction, and the center cross section O 1 of the center fiber layer S 12 is taken as the center cross section in the thickness direction, and the fiber arrangement intersects with this surface. The structure is symmetrical in direction and fiber amount.
[0030]
In the embodiment shown in FIG. 3C, an eight-layer (even layer) structure of the fiber layers S 21 , S 22 , S 23 , S 24 , S 25 , S 26 , S 27 , and S 28 is employed. The fiber arrangement direction of each fiber layer is set to 0 ° / 0 ° / 90 ° / 90 ° / 90 ° / 90 ° / 0 ° / 0 °. Thus, the outermost layer S 21, S 28 is a fibrous layer which is arranged in the same direction, the center of the laminated boundary surface O 2 as the thickness direction center section, is symmetrical cross direction of the fiber array with respect to this plane It has a structure.
[0031]
Also in these embodiments, as in the above-described embodiment, the front and back surfaces exhibit the same thermal expansion characteristics, so that there is no warping against a temperature change, and the fiber reinforced plastic molding is performed in the direction of the arrow shown in the figure. Since the plate can be easily curved by bending the plate, it is possible to perform high-quality bonding while expelling bubbles in the adhesive.
[0032]
FIG. 3 is a flowchart showing a work procedure of the reinforcing method according to the embodiment of the present invention. The work procedure will be described in conjunction with the description of FIG. In the drilling (core removal) work, after a reinforcing bar in a concrete structure is detected, a portion without a reinforcing bar is selected, and a through hole is formed in the target frame using a diamond core drill or the like (P 0 ). Then, the state where there is no smooth fragile portion and dirt by the concrete surface of the perforated peripheral portion 1b (base) Thunder Keren like to surface treatment (P 1). Thereafter, the sticking position of the fiber reinforced plastic molded plate 10 is blacked out, an adhesive (epoxy resin adhesive or the like) is applied to the bonding surface of the fiber reinforced plastic molded plate 10 with a uniform thickness, and further, the blacking position of the base is obtained. Then, an adhesive (epoxy resin adhesive or the like) is applied to a uniform thickness (P 2 ). Next, in a state where the fiber-reinforced plastic molded plate 10 is curved, a part of the end is adhered to the base, and the whole is pasted on the base while returning flat for removal (P 3 ). At this time, by sticking the air bubbles out of the adhesive, it is possible to prevent a space from being formed in the adhesive layer. Thereafter, curing is performed until the adhesive is hardened (P 4 ), and the work is completed by cleaning the periphery of the construction (P 5 ).
[0033]
【Example】
Hereinafter, more specific examples of the present invention will be described.
[0034]
[Fiber-reinforced plastic molded plate] A carbon fiber-reinforced plastic plate (CFRP plate) was molded by an autoclave molding method, and the arrangement of the fiber layers was set to 0 ° / 90 ° / 90 ° / 0 ° (see FIG. 2A). . The specifications of the formed plate were a fiber weight of 150 g / m 2 , a resin content of 35 wt%, and a plate thickness of 0.6 mm. The outer diameter is 400 mm × 400 mm, and the opening diameter is set to 125φ in the first example so as to match the perforation diameter of 125φ, and in the second example, it is set to 200φ including the perforation diameter of 125φ.
[0035]
[Adhesive] As the adhesive, one that does not matter odor, has little resin dripping (grease-like), and has a short curing time is suitable. As an adhesive satisfying these, an epoxy resin adhesive (product name: Tohodite CP471) composed of a base material: a bisphenol A type epoxy resin and a curing agent: a modified alicyclic polyamine can be employed.
[0036]
[Performance test] Using a test piece of a concrete structure (concrete mixing strength 18 N / mm 2 , length: 600 mm × width: 600 mm × thickness: 150 mm, three single bar arrangements) A hole of 125φ was formed in a state where the rebar was cut, and a tensile load test using a load cell was performed on each of the test pieces in Table 1 while supporting three rebars. The test results are shown in Table 2 and FIG.
[0037]
[Table 1]
Figure 2004316320
[0038]
[Table 2]
Figure 2004316320
[0039]
FIG. 4A shows the measurement results of the test pieces A, B and C, and FIG. 4B shows the test results of the test piece D. As is clear from these results, in the comparison between the specimen A and the specimen C, the initial crack initiation load was improved by 45% by attaching the carbon fiber reinforced plastic molded plate having the opening corresponding to the perforation. On the other hand, in the specimen C without reinforcement, the yield point of the reinforcing steel reached around 95 kN after the initial crack generation (C2), whereas in the specimen A with reinforcement, the proof stress could be maintained up to 139 kN. (A2). In addition, a comparison between the specimen B and the specimen C shows that the same reinforcing effect can be obtained by attaching a fiber-reinforced plastic molded plate having a slightly large opening to include the perforation.
[0040]
When the perforation is reinforced (specimen A, specimen B), the initial crack generation load is 85 to 90% even when compared with the case where no perforation is formed (specimen D). You can see that it has recovered to about. At this time, since the reinforcing bar was not cut in the test sample D to be compared, it is natural that there is a difference between the two, but a sufficient reinforcing effect is obtained from the viewpoint of preventing the occurrence of initial cracks. Can be confirmed.
[0041]
【The invention's effect】
Since the present invention is configured in this manner, the workability is good, a high-quality reinforcing effect can be obtained regardless of the construction skill of the constructor, and a sufficient reinforcing effect can be obtained with respect to changes in the surrounding environment. It is possible to provide a perforated peripheral part reinforcement method for an existing concrete structure that can be secured.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of a reinforcing method according to an embodiment of the present invention.
FIG. 2 is an explanatory view showing a fiber-reinforced plastic molded plate according to an embodiment of the present invention.
FIG. 3 is a flowchart showing a work procedure of a reinforcing method according to the embodiment of the present invention.
FIG. 4 is a graph showing test results of Examples.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame 1a Hole 1b Peripheral part 10 Fiber-reinforced plastic molded plate 10a Opening

Claims (5)

既設のコンクリート構造物に対して、敷設後に形成された穿孔の周辺部を補強する工法であって、
前記穿孔を少なくとも内包する開口を有し、周辺環境変化に対して平坦性を維持する繊維強化プラスチック成形板を用い、前記開口を前記穿孔に合わせて、前記繊維強化プラスチック成形板を接着剤を介して前記周辺部に貼り付けることを特徴とする既設コンクリート構造物に対する穿孔周辺部補強工法。
A method of reinforcing the periphery of a perforation formed after laying on an existing concrete structure,
Using a fiber-reinforced plastic molded plate having an opening at least including the perforation and maintaining flatness against changes in the surrounding environment, aligning the opening with the perforation, and bonding the fiber-reinforced plastic molded plate with an adhesive A perforated peripheral part reinforcement method for an existing concrete structure, wherein the peripheral part is attached to the peripheral part.
既設のコンクリート構造物に対して、敷設後に形成された穿孔の周辺部を補強する工法であって、
前記穿孔を少なくとも内包する開口を有し、少なくとも繊維の交差方向が板厚方向中央断面に対して対称となるように積層された繊維層を有する繊維強化プラスチック成形板を用い、前記開口を前記穿孔に合わせて、前記繊維強化プラスチック成形板を接着剤を介して前記周辺部に貼り付けることを特徴とする既設コンクリート構造物に対する穿孔周辺部補強工法。
A method of reinforcing the periphery of a perforation formed after laying on an existing concrete structure,
Using a fiber-reinforced plastic molded plate having a fiber layer laminated so that at least the cross direction of the fibers is symmetrical with respect to the central cross section in the plate thickness direction, having an opening that at least includes the perforation, A method of reinforcing a perimeter of an existing concrete structure, wherein the fiber-reinforced plastic molded plate is attached to the periphery through an adhesive.
前記繊維強化プラスチック成形板は偶数の繊維層からなることを特徴とする請求項1又は2に記載された既設コンクリート構造物に対する穿孔周辺部補強工法。3. The method according to claim 1, wherein the fiber-reinforced plastic molded plate comprises an even number of fiber layers. 前記繊維強化プラスチック成形板は3層の繊維層からなり、最外層が同方向に配列された繊維層であり、中央層がそれと異なる方向に配列されると共に繊維量を前記最外層の2倍にした繊維層であることを特徴とする請求項1又は2に記載された既設コンクリート構造物に対する穿孔周辺部補強工法。The fiber-reinforced plastic molded plate is composed of three fiber layers, the outermost layer being a fiber layer arranged in the same direction, the central layer being arranged in a different direction from the central layer, and the amount of fibers being twice that of the outermost layer. The method for reinforcing a perforated portion of an existing concrete structure according to claim 1 or 2, wherein the fiber layer is a reinforced fiber layer. 前記繊維強化プラスチック成形板を前記周辺部の片面のみに貼り付けることを特徴とする請求項1〜4のいずれかに記載された既設コンクリート構造物に対する穿孔周辺部補強工法。The method for reinforcing a perimeter of an existing concrete structure according to any one of claims 1 to 4, wherein the fiber-reinforced plastic molded plate is attached to only one surface of the perimeter.
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JP2011021379A (en) * 2009-07-15 2011-02-03 Ohbayashi Corp Reinforcing method for existing building and reinforcing structure
KR101597283B1 (en) * 2015-02-25 2016-02-24 서울대학교산학협력단 Clocking patch
JP2016080483A (en) * 2014-10-15 2016-05-16 大阪瓦斯株式会社 Survey method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2434615A (en) * 2006-01-25 2007-08-01 Cliff Thomas Device for modification, repair or framing of an aperture in a board
GB2434615B (en) * 2006-01-25 2008-12-24 Cliff Thomas Method And Device For Framing Apertures In Building Boards
JP2011021379A (en) * 2009-07-15 2011-02-03 Ohbayashi Corp Reinforcing method for existing building and reinforcing structure
JP2016080483A (en) * 2014-10-15 2016-05-16 大阪瓦斯株式会社 Survey method
KR101597283B1 (en) * 2015-02-25 2016-02-24 서울대학교산학협력단 Clocking patch

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