JP2004197325A - Fiber reinforced sheet - Google Patents

Fiber reinforced sheet Download PDF

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Publication number
JP2004197325A
JP2004197325A JP2002363788A JP2002363788A JP2004197325A JP 2004197325 A JP2004197325 A JP 2004197325A JP 2002363788 A JP2002363788 A JP 2002363788A JP 2002363788 A JP2002363788 A JP 2002363788A JP 2004197325 A JP2004197325 A JP 2004197325A
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JP
Japan
Prior art keywords
fiber
fiber reinforced
reinforced sheet
resin
fibers
Prior art date
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JP2002363788A
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Japanese (ja)
Inventor
Toshikazu Takeda
敏和 竹田
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Nippon Steel Chemical and Materials Co Ltd
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Nippon Steel Composite Co Ltd
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Priority to JP2002363788A priority Critical patent/JP2004197325A/en
Publication of JP2004197325A publication Critical patent/JP2004197325A/en
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  • Panels For Use In Building Construction (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Reinforced Plastic Materials (AREA)
  • Nonwoven Fabrics (AREA)
  • Bridges Or Land Bridges (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber reinforced sheet solving the problem of thread breakage in tensing while avoiding the formation of voids in construction to secure sufficient adhesive strength to a reinforced face, particularly carrying out the reinforcement or the like of a concrete structure based on a tension bonding method with excellent workability. <P>SOLUTION: In the fiber reinforced sheet 1, matrix resin is impregnated in reinforced fiber f, and a plurality of hardened continuous fiber reinforced plastic linear materials 2 are set parallel in a rattan blind shape in a longitudinal direction. The linear materials 2 are fixed to one another by fixing fiber materials 3. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、一般には、シート状補強材を使用した緊張接着技術に関するものであり、特に、土木建築構造物であるコンクリート構造物或いは鋼構造物（本願明細書では、コンクリート構造物或いは鋼構造物を含めて単に「構造物」という。）の補強に採用される緊張接着工法に好適に使用することのできる繊維強化シートに関するものである。
【０００２】
【従来の技術】
構造物の補強方法として、近年、既存或いは新設の構造物の表面に連続強化繊維シートを貼り付けたり、巻き付けたりする接着工法が開発されている。
【０００３】
しかしながら、上記接着工法は、単純な接着のみであり、ＦＲＰ（繊維強化プラスチック）補強材の剥離による構造物の早期破壊により、終局耐力の補強効果の向上に限界がある一方、例えばコンクリート構造物のひび割れの抑制効果にも限界がある。その上、ＦＲＰ補強材の高い性能が有効に活用されていない場合が多い。又、既存構造物のひび割れ損傷などの回復や死荷重に対する補強はできない。
【０００４】
このような問題を改善するべく、シート状補強材に荷重を付与して緊張し、緊張状態にてシート状補強材を構造物表面に接着する緊張接着工法が用いられつつある。この緊張接着工法にて使用されるシート状補強材としては、現在、樹脂を含浸していない繊維を一方向に引き揃えたシート、所謂、強化繊維シート、或いは、幅５０ｍｍ以上の繊維強化プラスチックの平板を用いている。
【０００５】
【発明が解決しようとする課題】
しかしながら、樹脂を含浸していない繊維を用いた強化繊維シートでは、製造上の問題或いは取扱い時の問題から、強化繊維が必ずしも一方向に一様には引き揃えられていない。そのため、緊張力を導入するべく、強化繊維シートに荷重を付与して緊張する際に部分的な糸切れが発生し、充分な緊張力を導入し得ないことがある。つまり、強化繊維シートが緊張に必要な充分な力を発揮できないことがある。通常、緊張力は、最終破断強度の５０％〜１５％減程度となっている。
【０００６】
又、繊維強化プラスチック平板を用いる場合には、板幅が広いため接着する際に、接着面にボイドが混入して充分な接着力を得ることが難しいといった問題がある。ボイドの発生を避けるために繊維強化プラスチック平板に孔を開けることが考えられるが、この場合には、繊維強化プラスチック平板の強化繊維を切断することとなり、好ましくない。
【０００７】
従って、本発明の目的は、緊張に際しての糸切れの問題を解決し、又、施工に際してのボイドの発生をも回避して被補強面に対して充分な接着力を得ることのできる、特に、緊張接着工法に基づくコンクリート構造物の補強などを極めて作業性良く実施することのできる繊維強化シートを提供することである。
【０００８】
【課題を解決するための手段】
上記目的は本発明に係る繊維強化シートにて達成される。要約すれば、本発明は、強化繊維にマトリクス樹脂が含浸され、硬化された連続した繊維強化プラスチック線材を複数本、長手方向にスダレ状に引き揃え、線材を互いに固定用繊維材にて固定したことを特徴とする繊維強化シートである。
【０００９】
本発明の一実施態様によると、前記繊維強化プラスチック線材は、直径が０．５〜３ｍｍの円形断面形状であるか、又は、幅が１〜１０ｍｍ、厚みが０．１〜２ｍｍとされる矩形断面形状である。
【００１０】
本発明の他の実施態様によると、前記各繊維強化プラスチック線材は、互いに０．１〜１．０ｍｍだけ離間している。
【００１１】
本発明の他の実施態様によると、前記繊維強化プラスチック線材は、その表面が粗面とされる。
【００１２】
本発明の他の実施態様によると、前記繊維強化シートは、幅が１００〜５００ｍｍである。
【００１３】
本発明の他の実施態様によると、前記固定用繊維材は、前記各繊維強化プラスチック線材の長手方向に対して垂直方向に複数本の前記繊維強化プラスチック線材を編み付ける横糸である。前記横糸は、ガラス繊維或いは有機繊維から成る糸条とし得る。
【００１４】
本発明の他の実施態様によると、前記固定用繊維材は、前記スダレ状に引き揃えた複数本の線材の片側面、又は、両面に配置され、接着されたメッシュ状支持体シートである。
【００１５】
本発明の他の実施態様によると、前記メッシュ状支持体シートは、ガラス繊維から成る糸条を１軸、２軸或いは３軸に配向して形成し、前記糸条表面に被覆された樹脂により前記スダレ状に引き揃えた複数本の繊維強化プラスチック線材に接着される。
【００１６】
本発明の他の実施態様によると、前記繊維強化プラスチック線材の強化繊維は、炭素繊維；ボロン繊維、チタン繊維、スチール繊維などの金属繊維；アラミド、ＰＢＯ（ポリパラフェニレンベンズビスオキサゾール）、ポリアミド、ポリアリレート、ポリエステルなどの有機繊維；が単独で、又は、複数種混入してハイブリッドにて使用される。また、前記繊維強化プラスチック線材のマトリクス樹脂は、常温硬化型或は熱硬化型のエポキシ樹脂、ビニールエステル樹脂、ＭＭＡ樹脂、不飽和ポリエステル樹脂、又はフェノール樹脂などの熱硬化性樹脂、又は、ナイロン、ビニロンなどの熱可塑性樹脂が使用可能である。
【００１７】
【発明の実施の形態】
以下、本発明に係る繊維強化シートを図面に則して更に詳しく説明する。
【００１８】
実施例１
図１及び図２に、本発明の繊維強化シート１の一実施例を示す。繊維強化シート１は、連続した繊維強化プラスチック線材２を複数本、長手方向にスダレ状に引き揃え、各線材２を互いに固定用繊維材３にて固定される。
【００１９】
繊維強化プラスチック線材２は、一方向に配向された多数本の連続した強化繊維ｆにマトリクス樹脂Ｒが含浸され硬化された細長形状（細径）のものであり、弾性を有している。従って、斯かる弾性の繊維強化プラスチック線材２をスダレ状に、即ち、線材２が互いに近接離間して引き揃えられたシート形状とされる繊維強化シート１は、その長手方向に弾性を有している。そのために、例えば、繊維強化シート１は、搬送時には、所定半径にて巻き込んだ状態にて持ち運びが可能であり、極めて可搬性に富んでいる。また、繊維強化シート１は、繊維強化プラスチック線材２にて構成されているために、搬送時に、従来の未含浸強化繊維シートのように、強化繊維の配向が乱れたり、また、緊張力導入時に、強化繊維の配向乱れに起因した糸切れを生じるといった心配は全くない。
【００２０】
更に説明すると、細径の繊維強化プラスチック線材２は、直径（ｄ）が０．５〜３ｍｍの略円形断面形状（図３（ａ））であるか、又は、幅（ｗ）が１〜１０ｍｍ、厚み（ｔ）が０．１〜２ｍｍとされる略矩形断面形状（図３（ｂ））とし得る。勿論、必要に応じて、その他の種々の断面形状とすることができる。また、繊維強化プラスチック線材２は、使用時における接着力を向上させるために、その表面が、ショットブラストや、金ブラシなどを用いて目荒らしを行い粗面とするのが好ましい。
【００２１】
上述のように、一方向に引き揃えスダレ状とされた繊維強化シート１において、各線材２は、互いに空隙（ｇ）＝０．１〜１．０ｍｍだけ近接離間して、固定用繊維材３にて固定される。また、このようにして形成された繊維強化シート１の長さ（Ｌ）及び幅（Ｗ）は、補強される構造物の寸法、形状に応じて適宜決定されるが、取扱い上の問題から、一般に、全幅（Ｗ）は、１００〜５００ｍｍとされる。又、長さ（Ｌ）は、１００ｍ以上のものを製造し得るが、使用時においては、適宜切断して使用される。
【００２２】
強化繊維ｆとしては、炭素繊維；ボロン繊維、チタン繊維、スチール繊維などの金属繊維；更には、アラミド、ＰＢＯ（ポリパラフェニレンベンズビスオキサゾール）、ポリアミド、ポリアリレート、ポリエステルなどの有機繊維；が単独で、又は、複数種混入してハイブリッドにて使用することができる。
【００２３】
繊維強化プラスチック線材に含浸されるマトリクス樹脂Ｒは、熱硬化性樹脂又は熱可塑性樹脂を使用することができ、熱硬化性樹脂としては、常温硬化型或は熱硬化型のエポキシ樹脂、ビニールエステル樹脂、ＭＭＡ樹脂、不飽和ポリエステル樹脂、又はフェノール樹脂などが好適に使用され、又、熱可塑性樹脂としては、ナイロン、ビニロンなどが好適に使用可能である。又、樹脂含浸量は、３０〜７０重量％、好ましくは、４０〜６０重量％とされる。
【００２４】
又、各線材２を固定用繊維材３にて固定する方法としては、図１に示すように、例えば、固定用繊維材３として横糸を使用し、一方向にスダレ状に配列された複数本の線材２から成るシート形態とされる線材、即ち、連続した線材シートを、線材に対して直交して一定の間隔（Ｐ）にて打ち込み、編み付ける方法を採用し得る。横糸３の打ち込み間隔（Ｐ）は、特に制限されないが、作製された繊維強化シート１の取り扱い性を考慮して、通常１〜１５ｍｍ間隔の範囲で選定される。
【００２５】
このとき、横糸３は、例えば直径２〜５０μｍのガラス繊維或いは有機繊維を複数本束ねた糸条とされる。又、有機繊維としては、ナイロン、ビニロンなどが好適に使用される。
【００２６】
各線材２をスダレ状に固定する他の方法としては、図２に示すように、固定用繊維材３としてメッシュ状支持体シートを使用することができる。
【００２７】
つまり、シート形態を成すスダレ状に引き揃えた複数本の線材２、即ち、線材シートの片側面、又は、両面を、例えば直径２〜５０μｍのガラス繊維或いは有機繊維にて作製したメッシュ状の支持体シート３により支持した構成とすることもできる。
【００２８】
この場合には、例えば、２軸構成とされるメッシュ状支持体シート３を構成する縦糸４及び横糸５の表面に低融点タイプの熱可塑性樹脂を予め含浸させておき、メッシュ状支持体シート３をスダレ状線材シートの両面に積層して加熱加圧し、メッシュ状支持体シート３の縦糸４及び横糸５の部分をスダレ状線材シートに溶着する。
【００２９】
メッシュ状支持体シート３は、２軸構成のほかに、ガラス繊維を３軸に配向して形成したり、或いは、ガラス繊維を線材２に対して直交する横糸５のみを配置した、所謂、１軸に配向して形成して前記シート状に引き揃えた複数本の線材２に接着することもできる。
【００３０】
又、上記固定用繊維材３の糸条としては、例えばガラス繊維を芯部に有し、低融点の熱融着性ポリエステルをその周囲に配したような二重構造の複合繊維も又好ましく用いられる。
【００３１】
次に、本発明の繊維強化シートの実験例について説明する。
【００３２】
実験例１
本発明の繊維強化シート１を使用して、緊張接着工法に従ってコンクリート梁を補強した。
【００３３】
本実験例では、図２を参照して説明した構成の繊維強化シート１を使用した。
【００３４】
繊維強化シート１における繊維強化プラスチック線材２は、強化繊維ｆとして平均径７μｍ、収束本数２４０００本のＰＡＮ系炭素繊維ストランドを用い、マトリクス樹脂Ｒとして常温硬化型のエポキシ樹脂を含浸し、硬化して作製した。樹脂含浸量は、４０重量％であり、硬化後の繊維強化プラスチック線材２は、直径１．４ｍｍの円形断面を有していた。
【００３５】
このようにして得た繊維強化プラスチック線材２を、一方向に引き揃えてスダレ状に配置した後、線材シートの片面に、メッシュ状支持体シート３を接着した。
【００３６】
メッシュ状支持体シート３は、縦糸４及び横糸５としてガラス繊維（番手３００ｄ、打ち込み本数１本／１０ｍｍ）を用いた２軸メッシュ状支持体シートであった。２軸メッシュ状支持体シート３の縦糸４及び横糸５の間隔は、１０ｍｍとした。
【００３７】
メッシュ状支持体シート３の縦糸４及び横糸５には、熱可塑性樹脂を、含有量３０重量％の割合で含浸させた。
【００３８】
このようにして作製した繊維強化シート１は、幅（Ｗ）が２００ｍｍ、長さ（Ｌ）が１００ｍであった。各線材２間の間隙（ｇ）は、０．３〜０．４ｍｍであった。
【００３９】
次に、上記繊維強化シート１を使用してコンクリート梁を緊張接着工法により、次のようにして補強した。
【００４０】
先ず、本実験例では、繊維強化シート１をコンクリート梁に接着するに先立って、繊維強化シート１に緊張力１００００ｋｇ／ｍｍ2を導入した。緊張力導入時に、何ら糸切れを発生することがなく、炭素繊維の破断強度近くまで充分な緊張力を導入することができた。
【００４１】
繊維強化シート１が緊張状態に維持された状態にて、コンクリート梁シート貼着面に対面した側から繊維強化シート１にマトリクス樹脂を塗布し、次いで、繊維強化シート１をコンクリート梁貼着面に接着した。この時、接着力を上げるため繊維強化シート回り全体をバグフィルムで覆い、真空ポンプでバグフィルム内の空気を抜き、真空圧で梁に押し付けながら接着した。繊維強化シート１の貼着面に、何らボイドを発生することなく、コンクリート梁に極めて良好に接着することができた。
【００４２】
上記実施例１、実験例１では、コンクリート構造物の補強に関して説明したが、本発明の繊維強化シート１は、鋼構造物の補強に際しても同様に適用することでき、同様の作用効果を達成し得る。
【００４３】
【発明の効果】
以上説明したように、本発明の繊維強化シートは、強化繊維にマトリクス樹脂が含浸され、硬化された連続した繊維強化プラスチック線材を複数本、長手方向にスダレ状に引き揃え、線材を互いに固定用繊維材にて固定した構成とされるので、緊張に際しての糸切れの問題を解決し、又、施工に際してのボイドの発生をも回避して被補強面に対して充分な接着力を得ることができ、特に、緊張接着工法に基づくコンクリート構造物の補強などを極めて作業性良く実施することができる。
【図面の簡単な説明】
【図１】
本発明の繊維強化シートの一実施例を示す斜視図である。
【図２】本発明の繊維強化シートの他の実施例を示す斜視図である。
【図３】本発明の繊維強化シートを構成する繊維強化プラスチック線材の断面図である。
【符号の説明】
１ 繊維強化シート
２ 繊維強化プラスチック線材
３ 固定用繊維材（横糸、メッシュ支持体シート）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention generally relates to a tension bonding technique using a sheet-like reinforcing material, and in particular, relates to a concrete structure or a steel structure (a concrete structure or a steel structure in the specification of the present application) which is a civil engineering building structure. The present invention relates to a fiber reinforced sheet that can be suitably used for a tension bonding method adopted for reinforcing a “structure”.
[0002]
[Prior art]
In recent years, as a method of reinforcing a structure, an adhesive construction method of attaching or winding a continuous reinforcing fiber sheet to the surface of an existing or newly-installed structure has been developed.
[0003]
However, the above-mentioned bonding method is only simple bonding, and there is a limit to the improvement of the reinforcing effect of the ultimate proof strength due to the early destruction of the structure due to the separation of the FRP (fiber reinforced plastic) reinforcing material. There is a limit to the effect of suppressing cracks. In addition, the high performance of FRP reinforcement is often not utilized effectively. In addition, it is not possible to recover the existing structure from crack damage or to reinforce against dead load.
[0004]
In order to solve such a problem, a tension bonding method has been used in which a load is applied to the sheet-like reinforcing material to tension the sheet-like reinforcing material, and the sheet-like reinforcing material is bonded to the surface of the structure in a tensioned state. As the sheet-like reinforcing material used in this tension bonding method, at present, a sheet in which fibers not impregnated with resin are aligned in one direction, a so-called reinforced fiber sheet, or a fiber-reinforced plastic having a width of 50 mm or more is used. A flat plate is used.
[0005]
[Problems to be solved by the invention]
However, in the case of a reinforcing fiber sheet using fibers not impregnated with a resin, the reinforcing fibers are not always uniformly arranged in one direction due to a problem in production or a problem in handling. Therefore, when a tension is applied and a load is applied to the reinforcing fiber sheet to cause tension, partial thread breakage may occur, and sufficient tension may not be introduced. That is, the reinforcing fiber sheet may not be able to exert a sufficient force necessary for tension. Usually, the tension is reduced by about 50% to 15% of the final breaking strength.
[0006]
Further, in the case of using a fiber reinforced plastic flat plate, there is a problem that a void is mixed into the bonding surface when bonding due to a large width of the plate, so that it is difficult to obtain a sufficient bonding force. It is conceivable to make a hole in the fiber reinforced plastic flat plate to avoid the generation of voids. However, in this case, the reinforcing fibers of the fiber reinforced plastic flat plate are cut, which is not preferable.
[0007]
Therefore, an object of the present invention is to solve the problem of thread breakage during tensioning, and also to obtain a sufficient adhesive force to the reinforced surface while avoiding the occurrence of voids during construction, An object of the present invention is to provide a fiber reinforced sheet that can reinforce a concrete structure based on a tension bonding method with extremely good workability.
[0008]
[Means for Solving the Problems]
The above object is achieved by a fiber reinforced sheet according to the present invention. In summary, the present invention impregnated the matrix resin into the reinforcing fibers, a plurality of hardened continuous fiber-reinforced plastic wires, aligned in the longitudinal direction in a slender shape, the wires were fixed to each other with the fixing fiber material. A fiber reinforced sheet characterized by the above.
[0009]
According to one embodiment of the present invention, the fiber reinforced plastic wire has a circular cross-sectional shape having a diameter of 0.5 to 3 mm or a rectangle having a width of 1 to 10 mm and a thickness of 0.1 to 2 mm. It is a cross-sectional shape.
[0010]
According to another embodiment of the present invention, the fiber reinforced plastic wires are separated from each other by 0.1 to 1.0 mm.
[0011]
According to another embodiment of the present invention, the fiber reinforced plastic wire has a rough surface.
[0012]
According to another embodiment of the present invention, the fiber reinforced sheet has a width of 100 to 500 mm.
[0013]
According to another embodiment of the present invention, the fixing fiber material is a weft knitting a plurality of the fiber reinforced plastic wires in a direction perpendicular to a longitudinal direction of each of the fiber reinforced plastic wires. The weft yarns may be glass fibers or organic fibers.
[0014]
According to another embodiment of the present invention, the fixing fiber material is a mesh-like support sheet which is arranged and adhered to one side or both sides of the plurality of wires which are arranged in a stale shape.
[0015]
According to another embodiment of the present invention, the mesh-like support sheet is formed by forming a yarn made of glass fiber uniaxially, biaxially, or triaxially and forming a resin coated on the yarn surface. It is bonded to the plurality of fiber reinforced plastic wires aligned in the form of a sump.
[0016]
According to another embodiment of the present invention, the reinforcing fibers of the fiber-reinforced plastic wire are carbon fibers; metal fibers such as boron fibers, titanium fibers, and steel fibers; aramid, PBO (polyparaphenylene benzobisoxazole), polyamide, Organic fibers such as polyarylate, polyester and the like are used alone or in a hybrid of plural kinds. In addition, the matrix resin of the fiber reinforced plastic wire is a thermosetting resin such as a cold-setting or thermosetting epoxy resin, a vinyl ester resin, an MMA resin, an unsaturated polyester resin, or a phenol resin, or nylon. A thermoplastic resin such as vinylon can be used.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the fiber reinforced sheet according to the present invention will be described in more detail with reference to the drawings.
[0018]
Example 1
1 and 2 show one embodiment of the fiber reinforced sheet 1 of the present invention. In the fiber reinforced sheet 1, a plurality of continuous fiber reinforced plastic wires 2 are aligned in the longitudinal direction in the form of a flat line, and the wires 2 are fixed to each other by the fixing fiber material 3.
[0019]
The fiber reinforced plastic wire 2 has an elongated shape (small diameter) in which a matrix resin R is impregnated into a large number of continuous reinforcing fibers f oriented in one direction and hardened, and has elasticity. Therefore, the fiber reinforced plastic wire 1 having such a shape that the elastic fiber reinforced plastic wire 2 is formed in a sloping shape, that is, the wire 2 is closely spaced from each other and aligned, has elasticity in its longitudinal direction. I have. For this reason, for example, the fiber reinforced sheet 1 can be carried in a state of being wrapped around at a predetermined radius when being conveyed, and is extremely portable. Further, since the fiber reinforced sheet 1 is composed of the fiber reinforced plastic wire 2, the orientation of the reinforcing fibers is disturbed during transportation as in the case of the conventional non-impregnated reinforced fiber sheet, and when the tension is introduced. There is no fear that yarn breakage due to the disorder of the orientation of the reinforcing fibers occurs.
[0020]
More specifically, the thin fiber-reinforced plastic wire 2 has a substantially circular cross-sectional shape (FIG. 3A) having a diameter (d) of 0.5 to 3 mm, or a width (w) of 1 to 10 mm. And a substantially rectangular cross-sectional shape (FIG. 3B) having a thickness (t) of 0.1 to 2 mm. Of course, other various cross-sectional shapes can be used as needed. In addition, in order to improve the adhesive strength at the time of use, the surface of the fiber reinforced plastic wire 2 is preferably roughened by roughening using a shot blast or a gold brush.
[0021]
As described above, in the fiber reinforced sheet 1 that has been drawn in one direction and formed into a sloping shape, the wires 2 are separated from each other by a gap (g) = 0.1 to 1.0 mm, and the fixing fiber 3 Is fixed at. Further, the length (L) and width (W) of the fiber reinforced sheet 1 thus formed are appropriately determined according to the size and shape of the structure to be reinforced. Generally, the total width (W) is 100 to 500 mm. In addition, a length (L) of 100 m or more can be manufactured.
[0022]
As the reinforcing fibers f, carbon fibers; metal fibers such as boron fibers, titanium fibers, and steel fibers; and organic fibers such as aramid, PBO (polyparaphenylene benzobisoxazole), polyamide, polyarylate, and polyester alone. , Or a mixture of a plurality of types can be used in a hybrid.
[0023]
As the matrix resin R impregnated in the fiber reinforced plastic wire, a thermosetting resin or a thermoplastic resin can be used. As the thermosetting resin, a room temperature curing type or a thermosetting type epoxy resin, a vinyl ester resin or the like can be used. , MMA resin, unsaturated polyester resin, phenol resin and the like are preferably used, and as the thermoplastic resin, nylon, vinylon and the like are preferably used. The resin impregnation amount is 30 to 70% by weight, preferably 40 to 60% by weight.
[0024]
As a method for fixing each wire 2 with the fixing fiber 3, as shown in FIG. 1, for example, a weft yarn is used as the fixing fiber 3, and a plurality of wires 2 are arranged in a one-sided slender shape. A method of driving and knitting a wire material in a sheet form composed of the wire material 2, that is, a continuous wire material sheet at a predetermined interval (P) perpendicular to the wire material can be adopted. The driving interval (P) of the weft yarn 3 is not particularly limited, but is usually selected in the range of 1 to 15 mm in consideration of the handleability of the produced fiber reinforced sheet 1.
[0025]
At this time, the weft 3 is a yarn obtained by bundling a plurality of glass fibers or organic fibers having a diameter of 2 to 50 μm, for example. Nylon, vinylon, etc. are preferably used as the organic fibers.
[0026]
As another method for fixing each wire 2 in a sloping shape, a mesh-like support sheet can be used as the fixing fiber material 3 as shown in FIG.
[0027]
In other words, a plurality of wire rods 2 arranged in the form of a sheet in the form of a sheet, that is, a mesh-like support in which one side or both sides of a wire sheet is made of, for example, glass fiber or organic fiber having a diameter of 2 to 50 μm. The structure supported by the body sheet 3 can also be used.
[0028]
In this case, for example, the surfaces of the warp yarns 4 and the weft yarns 5 constituting the mesh-shaped support sheet 3 having a biaxial configuration are impregnated with a low melting point type thermoplastic resin in advance, and the mesh-shaped support sheet 3 is formed. Are laminated on both sides of the slender wire sheet and heated and pressed to weld the warp yarn 4 and the weft yarn 5 of the mesh-like support sheet 3 to the slender wire sheet.
[0029]
The mesh-shaped support sheet 3 has a so-called 1-axis configuration in which, in addition to the biaxial configuration, glass fibers are formed in a triaxial orientation, or the glass fibers are arranged with only the wefts 5 orthogonal to the wire 2. It can also be bonded to the plurality of wire rods 2 which are formed so as to be oriented in the axis and are aligned in the sheet shape.
[0030]
As the thread of the fixing fiber material 3, for example, a double-structure composite fiber having a glass fiber core and a low-melting heat-fusible polyester disposed around the core is also preferably used. Can be
[0031]
Next, an experimental example of the fiber reinforced sheet of the present invention will be described.
[0032]
Experimental example 1
Using the fiber reinforced sheet 1 of the present invention, a concrete beam was reinforced according to a tension bonding method.
[0033]
In this experimental example, the fiber reinforced sheet 1 having the configuration described with reference to FIG. 2 was used.
[0034]
The fiber-reinforced plastic wire 2 in the fiber-reinforced sheet 1 is made of a PAN-based carbon fiber strand having an average diameter of 7 μm and a convergence number of 24,000 as a reinforcing fiber f, and is impregnated with a room-temperature-curable epoxy resin as a matrix resin R and cured. Produced. The resin impregnation amount was 40% by weight, and the cured fiber-reinforced plastic wire 2 had a circular cross section of 1.4 mm in diameter.
[0035]
After the fiber-reinforced plastic wires 2 thus obtained were aligned in one direction and arranged in a stagnation shape, a mesh-like support sheet 3 was bonded to one surface of the wire material sheet.
[0036]
The mesh-like support sheet 3 was a biaxial mesh-like support sheet using glass fibers (300d, count 1/10 mm) as warp yarns 4 and weft yarns 5. The interval between the warp yarns 4 and the weft yarns 5 of the biaxial mesh support sheet 3 was 10 mm.
[0037]
The warp yarns 4 and the weft yarns 5 of the mesh-like support sheet 3 were impregnated with a thermoplastic resin at a content of 30% by weight.
[0038]
The fiber reinforced sheet 1 thus produced had a width (W) of 200 mm and a length (L) of 100 m. The gap (g) between the wires 2 was 0.3 to 0.4 mm.
[0039]
Next, using the fiber reinforced sheet 1, a concrete beam was reinforced by a tension bonding method as follows.
[0040]
First, in this experimental example, a tension of 10,000 kg / mm 2 was introduced into the fiber reinforced sheet 1 before the fiber reinforced sheet 1 was bonded to the concrete beam. At the time of the introduction of tension, a sufficient tension could be introduced to near the breaking strength of the carbon fiber without any yarn breakage.
[0041]
While the fiber reinforced sheet 1 is maintained in a tensioned state, a matrix resin is applied to the fiber reinforced sheet 1 from the side facing the concrete beam sheet attachment surface, and then the fiber reinforced sheet 1 is applied to the concrete beam attachment surface. Glued. At this time, the entire area around the fiber reinforced sheet was covered with a bag film in order to increase the adhesive strength, the air in the bag film was evacuated with a vacuum pump, and the sheets were bonded while being pressed against the beam by vacuum pressure. It was possible to adhere to the concrete beam extremely well without generating any voids on the attachment surface of the fiber reinforced sheet 1.
[0042]
In the first embodiment and the first experimental example, the description has been given of the reinforcement of the concrete structure. However, the fiber reinforced sheet 1 of the present invention can be similarly applied to the reinforcement of the steel structure, and achieves the same operation and effect. obtain.
[0043]
【The invention's effect】
As described above, the fiber reinforced sheet of the present invention is obtained by impregnating the reinforcing fiber with the matrix resin and arranging a plurality of hardened continuous fiber reinforced plastic wires, in a longitudinal direction in a slender shape, and fixing the wires to each other. Since it is fixed with fiber material, it is possible to solve the problem of thread breakage at the time of tension, and to avoid the occurrence of voids at the time of construction and to obtain sufficient adhesion to the surface to be reinforced. In particular, it is possible to reinforce a concrete structure based on the tension bonding method with very good workability.
[Brief description of the drawings]
FIG.
It is a perspective view showing one example of a fiber reinforced sheet of the present invention.
FIG. 2 is a perspective view showing another embodiment of the fiber reinforced sheet of the present invention.
FIG. 3 is a sectional view of a fiber reinforced plastic wire constituting the fiber reinforced sheet of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fiber-reinforced sheet 2 Fiber-reinforced plastic wire 3 Fixing fiber (weft, mesh support sheet)

Claims (11)

強化繊維にマトリクス樹脂が含浸され、硬化された連続した繊維強化プラスチック線材を複数本、長手方向にスダレ状に引き揃え、線材を互いに固定用繊維材にて固定したことを特徴とする繊維強化シート。A fiber reinforced sheet in which a plurality of continuous fiber reinforced plastic wires which have been impregnated with a matrix resin into a reinforcing fiber and which have been hardened are arranged in a longitudinal direction in a slender manner, and the wires are fixed to each other with a fixing fiber material. . 前記繊維強化プラスチック線材は、直径が０．５〜３ｍｍの円形断面形状であるか、又は、幅が１〜１０ｍｍ、厚みが０．１〜２ｍｍとされる矩形断面形状であることを特徴とする請求項１の繊維強化シート。The fiber-reinforced plastic wire has a circular cross-sectional shape having a diameter of 0.5 to 3 mm, or a rectangular cross-sectional shape having a width of 1 to 10 mm and a thickness of 0.1 to 2 mm. The fiber reinforced sheet according to claim 1. 前記各繊維強化プラスチック線材は、互いに０．１〜１．０ｍｍだけ離間していることを特徴とする請求項１又は２の繊維強化シート。The fiber reinforced sheet according to claim 1 or 2, wherein the fiber reinforced plastic wires are separated from each other by 0.1 to 1.0 mm. 前記繊維強化プラスチック線材は、その表面が粗面とされることを特徴とする請求項１、２、又は３の繊維強化シート。4. The fiber reinforced sheet according to claim 1, wherein the fiber reinforced plastic wire has a rough surface. 前記繊維強化シートは、幅が１００〜５００ｍｍであることを特徴とする請求項１〜４のいずれかの項に記載の繊維強化シート。The fiber reinforced sheet according to any one of claims 1 to 4, wherein the fiber reinforced sheet has a width of 100 to 500 mm. 前記固定用繊維材は、前記各繊維強化プラスチック線材の長手方向に対して垂直方向に複数本の前記繊維強化プラスチック線材を編み付ける横糸であることを特徴とする請求項１〜５のいずれかの項に記載の繊維強化シート。The said fixing fiber material is the weft which knits several said fiber reinforced plastic wires in the perpendicular | vertical direction with respect to the longitudinal direction of each said fiber reinforced plastic wire, The Claim 1 characterized by the above-mentioned. The fiber-reinforced sheet according to item. 前記横糸は、ガラス繊維或いは有機繊維から成る糸条であることを特徴とする請求項６の繊維強化シート。The fiber reinforced sheet according to claim 6, wherein the weft is a thread made of glass fiber or organic fiber. 前記固定用繊維材は、前記スダレ状に引き揃えた複数本の線材の片側面、又は、両面に配置され、接着されたメッシュ状支持体シートであることを特徴とする請求項１〜５のいずれかの項に記載の繊維強化シート。6. The fixing fiber material according to claim 1, wherein the fixing fiber material is a mesh-like support sheet that is arranged on one side or both sides of the plurality of wire rods arranged in a slender shape and bonded. The fiber-reinforced sheet according to any one of the above items. 前記メッシュ状支持体シートは、ガラス繊維から成る糸条を１軸、２軸或いは３軸に配向して形成し、前記糸条表面に被覆された樹脂により前記スダレ状に引き揃えた複数本の繊維強化プラスチック線材に接着されることを特徴とする請求項８の繊維強化シート。The mesh-like support sheet is formed of a plurality of glass fibers formed by uniaxially, biaxially, or triaxially oriented yarns, and aligned in the form of the sump by a resin coated on the surface of the yarns. 9. The fiber reinforced sheet according to claim 8, which is bonded to a fiber reinforced plastic wire. 前記繊維強化プラスチック線材の強化繊維は、炭素繊維；ボロン繊維、チタン繊維、スチール繊維などの金属繊維；アラミド、ＰＢＯ（ポリパラフェニレンベンズビスオキサゾール）、ポリアミド、ポリアリレート、ポリエステルなどの有機繊維；が単独で、又は、複数種混入してハイブリッドにて使用されることを特徴とする請求項１〜９のいずれかの項に記載の繊維強化シート。The reinforcing fibers of the fiber reinforced plastic wire are carbon fibers; metal fibers such as boron fibers, titanium fibers, and steel fibers; and organic fibers such as aramid, PBO (polyparaphenylene benzobisoxazole), polyamide, polyarylate, and polyester. The fiber reinforced sheet according to any one of claims 1 to 9, wherein the fiber reinforced sheet is used singly or in a mixture of a plurality of kinds. 前記繊維強化プラスチック線材のマトリクス樹脂は、常温硬化型或は熱硬化型のエポキシ樹脂、ビニールエステル樹脂、ＭＭＡ樹脂、不飽和ポリエステル樹脂、又はフェノール樹脂などの熱硬化性樹脂、又は、ナイロン、ビニロンなどの熱可塑性樹脂であることを特徴とする請求項１〜１０のいずれかの項に記載の繊維強化シート。The matrix resin of the fiber-reinforced plastic wire is a thermosetting resin such as a cold-setting or thermosetting epoxy resin, a vinyl ester resin, an MMA resin, an unsaturated polyester resin, or a phenol resin, or nylon, vinylon, or the like. The fiber-reinforced sheet according to any one of claims 1 to 10, wherein the fiber-reinforced sheet is a thermoplastic resin.
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