JP4004616B2 - Reinforcement method of concrete member by fiber material tension - Google Patents

Reinforcement method of concrete member by fiber material tension Download PDF

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Publication number
JP4004616B2
JP4004616B2 JP35505097A JP35505097A JP4004616B2 JP 4004616 B2 JP4004616 B2 JP 4004616B2 JP 35505097 A JP35505097 A JP 35505097A JP 35505097 A JP35505097 A JP 35505097A JP 4004616 B2 JP4004616 B2 JP 4004616B2
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Japan
Prior art keywords
fiber
jig
concrete
reinforcing
sheet
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JPH11182061A (en
Inventor
智深 呉
幸雄 岩松
智優 松崎
菊次郎 田名部
建 神田
公夫 福沢
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オリエンタル建設株式会社
智深 呉
新日鉄マテリアルズ株式会社
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0255Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements whereby the fiber reinforced plastic elements are stressed
    • E04G2023/0259Devices specifically adapted to stress the fiber reinforced plastic elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0262Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off

Description

【0001】
【発明の属する技術分野】
本発明は、緊張力の導入された繊維材を用いたコンクリート部材の補強工法及び補強構造に関する。
【0002】
【従来の技術】
コンクリート構造物の補強方法として、梁部材の下面および両側面に炭素繊維シートを接着する方法が、特開平9−60309号公報に開示されており、この両側面の炭素繊維シートには複数のスリットが形成されている。また、別の文献では、アラミド繊維のみからなるシートに緊張力を導入し、これを梁部材の両側面のみに接着する方法を提案するものもある。
【0003】
【発明が解決しようとする課題】
上記特開平9−60309号公報が開示する方法では、梁部材下面の炭素繊維シートに緊張力を導入しないため、引張力に対する耐力の補強効果が充分に得られず、また、スリットを有する一枚ものの炭素繊維シートは、製造に手間が掛かり煩雑である。
【0004】
またアラミド繊維のみからなるシートに緊張力を導入して用いる上記従来例では、該シートを梁部材の両側面に接着するのみであるため、曲げ耐力の補強効果は得られず、しかもアラミド繊維のみからなるシートはヤング係数が低いため、緊張時の伸びが大きくなり、既設コンクリート部材の補強に使用する場合、広い作業空間を必要とし、さらに、梁部材に引張力が作用したときにシートの両端部が剥離しやすいという欠点がある。またアラミド繊維はクリープ特性が悪く、緊張力を与えた後、長期の使用では緊張力が減少する欠点がある。
【0005】
本発明は、上記従来の問題点を解決せんとしたものであり、その課題は、ヤング率が高く、クリープ特性に優れる炭素繊維を含む補強材を用いることにより、コンクリート部材の曲げ耐力、靱性及びひび割れの抑制効果を向上させることができるコンクリート部材の補強方法及び補強構造を提供することにある。
【0006】
また本発明の別の課題は、施工を容易に行うことができると共に、繊維材の剥離に対する耐力を向上させることができる、コンクリート部材の補強方法及び補強構造を提供することにある。
【0007】
【課題を解決するための手段】
本発明では、上記課題を解決するために、両面が平らに形成され、一端に円弧面を有する一対の治具を繊維材の両端に配置し、繊維材の両端を治具の平らな一面に沿って延ばし、円弧面に巻き付けて折り返し、さらに治具の平らな他面に沿って延ばし、該平らな他面にて治具に固定する第1工程と、該治具を介して緊張装置により該繊維材に緊張力を導入する第2工程と、接着剤により該繊維材をコンクリート部材の表面に貼着する第3工程と、第3工程の後に該繊維材から該緊張装置及び該治具を取り外す第4工程と、該繊維材の両端に剥離防止のための端部補強手段を固定する第5工程とを含むコンクリート部材の補強方法を提供する。
本発明の補強方法では、第1工程において、繊維材を折り返して治具の円弧面に巻き付けて固定するので、繊維材に破損を生じること無く緊張力を導入できる。なお、本発明の補強方法は、既設又は新設の何れの構造物のコンクリート部材にも適用することができる。
【0008】
本発明の補強方法の前記第1工程において、繊維材の両端を治具に固定するために、例えば、接着剤を用いて繊維材と治具とを接着しても良い。
【0009】
また、前記第1工程において、上面に複数の波形凹凸を備える治具と、該波形凹凸と相補の凹凸面を有する押え板とを使用し、折り返した前記繊維材の両端を該治具の波形凹凸上まで延ばし、該治具と押え板との凹凸面で前記繊維材を挾持することにより、固定しても良い。このように波形凹凸面を備える治具と押え板とを使用することにより、接着剤等を使用しなくても、その押圧力のみで繊維材を確実に把持・固定することができる。
【0010】
また本発明では、緊張力を導入し、コンクリート部材の表面に貼着した繊維材と、該繊維材が該コンクリート部材から剥離するのを防止するため、その両端部に設けられた端部補強手段とを備えたことを特徴とするコンクリート部材の補強構造を提供する。なお、上記補強構造は、既設又は新設の何れの構造物のコンクリート部材にも適用可能である。
【0011】
本発明を適用する前記コンクリート部材としては、柱部材、床版等のスラブ部材、梁又は桁部材がある。また前記繊維材は、強化繊維として少なくとも炭素繊維を含む炭素繊維シート、クロス及び樹脂を含浸したプリプレグであって、所望により強化繊維としての該炭素繊維に加えて、ガラス繊維、アラミド繊維等の有機繊維、ナイロン繊維あるいはポリエステル繊維を一種又は複数種混入したハイブリッドタイプのものを使用することができる。さらに、好ましくは、前記ハイブリッドタイプの繊維材は、シート状に形成される。さらに又、前記端部補強手段としては、前記シート状の繊維材又は鋼板等の金属製の板体を使用することができる。
【0012】
【実施例】
以下、本発明の実施例を添付図面を参照して説明するが、本発明はこれに限定されるものではない。図1(a)〜(c)は本発明の第1工程を説明するための概略図であり、図2は本発明に用いる治具の斜視図であり、図3(a)は図1及び図2の治具とは異なる形状の治具を示す側面図であり、図3(b)は図3(a)の治具に繊維材を固定する工程を示す側面図である。また、図4(a)は本発明に用いる緊張装置の平面図であり、図4(b)は緊張装置の側面図であり、図5(a)(b)は第4工程を説明するための斜視図であり、図6(a)(b)は図5とは異なる端部補強手段を説明するための平面図及び斜視図である。
【0013】
本発明の補強構造は、緊張力を導入した繊維材としてのCFRPシート13を、コンクリート梁40の下面に貼着し、このCFRPシート13の両端に端部補強シート15又は端部補強板16を固定して形成する。
ここで、前記CFRPシート13は、強化繊維としての炭素繊維にエポキシ樹脂等のマトリクス樹脂が含浸されて成形された炭素繊維強化プラスチックであり、炭素繊維は、PNA系繊維、ピッチ系繊維などを使用することができる。このCFRPシート13は、例えば、トウシート(東燃株式会社製、商品名「FTS−C1−20」)を使用して作製することができる。そして、CFRPシート13は、緊張力を導入した状態でコンクリート梁40の下面に貼着する。したがって、このCFRPシート13からはコンクリート梁40に緊張力が伝達されて、その曲げ・せん断耐力の補強効果およびひび割れの抑制効果を向上させることができる。
【0014】
また前記端部補強シート15は、CFRPシート13と同様のシートを用いて、図5に示したように、コンクリート梁40の下面の幅よりも長く、且つ、両側面に折り返すことができる長さに形成し、緊張力を導入せずにエポキシ樹脂等の接着剤によりコンクリート梁40に貼着する。このように端部補強シート15とCFRPシート13とを一枚もので形成せずに、別の部材で構成することにより、CFRPシート13の緊張工程及び貼着工程や、端部補強シート15の貼着工程の作業性を良好なものにできる。また端部補強シート15を、コンクリート梁40の両側面間に連続させて貼着することで、CFRPシート13の剥離防止効果が向上する。
【0015】
一方、端部補強板16としては、CFRPシート13の幅以上の長さに形成した鋼板を使用し、これをCFRPシート13のうえからアンカーボルト17によってコンクリート梁40に圧着・固定する。なお、端部補強板16は、CFRPシート13への当接面に接着剤を塗布したうえで、固定しても良い。
【0016】
次に、本発明のコンクリート部材の補強方法について説明する。
第1工程では、図1に示したように、治具12を所定長のCFRPシート13の両端に配置し、CFRPシート13の両端を折り返して治具12の曲面12bに巻き付けるように固定する。すなわち、治具12は、図2に示したように一端に曲面12bを備え、上面にピン孔12aが設けられたものを使用し、その上下面と曲面12bとにエポキシ接着剤を塗布して、ここにCFRPシート13の両端を巻き付けて貼着する。さらに、治具12に貼着されたCFRPシート13の上には、ピン孔11aが形成された押え板11を接着剤で貼着する。なお、CFRPシート13には、ピン孔11a,12aが連通するように適宜、孔を形成する。
【0017】
次に、第2工程では、CFRPシート13に緊張力を導入する。ここで、緊張力を導入するための装置は特に限定されないが、例えば、図4に示したような緊張装置30を使用することができる。すなわち、緊張装置30では、CFRPシート13を囲むことができる大きさのフレーム31と、このフレーム31の両端にそれぞれ設けられた緊張軸32,32とを備え、一方の緊張軸32にはロードセル34が連設され、他方の緊張軸32には油圧ジャッキ35が設けられ、油圧ジャッキ35とフレーム31との間の緊張軸32には緊張力定着ナット36が配置され、さらに、緊張軸32,32には、治具12と押え板11のピン孔12a,11aに挿入可能なピン14がそれぞれ凸設されている。
この緊張装置30のピン14を、CFRPシート13に固定された治具12と押え板11のピン孔12a,11aに挿入した後、ロードセル34で緊張荷重を計測しながら油圧ジャッキ35を駆動し、所定の緊張荷重まで加圧してCFRPシート13に緊張力を導入する。
【0018】
第3工程では、緊張力が導入されたCFRPシート13またはコンクリート梁40の何れか一方の当接面、あるいは両方の当接面にエポキシ樹脂接着剤を塗布し、CFRPシート13をコンクリート梁40に貼着する。なお、コンクリート梁40の表面は、CFRPシート13の貼着に先立ち、予め研磨し、その後にプライマーを塗布して下地処理を行う。
【0019】
接着剤が乾燥して、CFRPシート13がコンクリート梁40に貼着できたら、第4工程として、CFRPシート13から緊張装置30、治具12及び押え板11を取り外し、さらに、第5工程としてCFRPシート13の剥離防止のため、図5及び図6に示したように、この両端部の上に端部補強シート15又は端部補強板16を取り付ければ、コンクリート梁40の補強施工は終了する。
【0020】
なお、上記第1工程においては、押え板及び治具として、図3(a)(b)に例示したものを使用しても良い。この治具22は、その上面に複数の波形凹凸22cが形成され、ピン14を挿入するための貫通孔21aを備える。一方、押え板21には、治具22の波形凹凸22cと相補な形状の凹凸面21cが形成され、治具22と当接した際に、貫通孔21aと連通するピン孔22aを備える。この押え板21及び治具22を使用する場合、図3(b)に示したように、CFRPシート13の端部を治具22の曲面22bに巻きつけると共に、CFRPシート13を治具22と押え板21との凹凸面22c,21cで挾み、ボルト等(図示せず)の固定具によって圧着する。このように波形凹凸面22c,21cを備える治具22と押え板21とを使用することにより、接着剤等を使用しなくても、その凹凸面の抵抗力と押圧力のみで繊維材を確実に把持・固定することが可能になり、したがって、治具22及び押え板21の繰り返し使用が容易になる。
【図面の簡単な説明】
【図1】 (a)〜(c)は本発明の第1工程を説明するための概略図である。
【図2】本発明に用いる治具の斜視図である。
【図3】 (a)は図2とは異なる形状の治具を示す側面図であり、(b)は(a)の治具に繊維材を固定する工程を示す側面図である。
【図4】 (a)(b)はそれぞれ緊張装置の平面図及び側面図である。
【図5】 (a)(b)は第4工程を説明するための斜視図である。
【図6】 (a)(b)は図5とは異なる端部補強手段を説明するための平面図及び斜視図である。
【符号の説明】
12 治具
12b 治具の曲面
13 CFRPシート(繊維材)
15 端部補強シート(端部補強手段)
16 端部補強板(端部補強手段)
21 押え板
21c 波形凹凸面
22 治具
22c 波形凹凸
30 緊張装置
40 コンクリート梁(コンクリート部材)
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing method and a reinforcing structure for a concrete member using a fiber material into which tension is introduced.
[0002]
[Prior art]
As a method for reinforcing a concrete structure, a method of adhering a carbon fiber sheet to the lower surface and both side surfaces of a beam member is disclosed in Japanese Patent Laid-Open No. 9-60309, and the carbon fiber sheet on both side surfaces has a plurality of slits. Is formed. Another document proposes a method in which tension is introduced into a sheet made of only aramid fibers, and this is adhered to only both side surfaces of the beam member.
[0003]
[Problems to be solved by the invention]
In the method disclosed in the above Japanese Patent Laid-Open No. 9-60309, tension is not introduced into the carbon fiber sheet on the lower surface of the beam member, so that a sufficient reinforcing effect of yield strength against tensile force cannot be obtained, and one sheet having a slit is provided. However, the carbon fiber sheet is troublesome to manufacture and complicated.
[0004]
Further, in the above-described conventional example in which tension is introduced into a sheet made of only aramid fibers, the sheet is only bonded to both side surfaces of the beam member, so that the reinforcing effect of bending strength cannot be obtained, and only aramid fibers are used. Since the sheet made of the material has a low Young's modulus, the elongation at the time of tension increases, and when it is used to reinforce an existing concrete member, a large work space is required, and furthermore, both ends of the sheet when a tensile force acts on the beam member There is a drawback that the part is easily peeled off. In addition, aramid fibers have poor creep characteristics, and have a drawback in that after applying tension, the tension decreases with long-term use.
[0005]
The present invention has been made to solve the above-mentioned conventional problems, and the problem is that by using a reinforcing material containing carbon fiber having a high Young's modulus and excellent creep characteristics, the bending strength, toughness and An object of the present invention is to provide a reinforcing method and a reinforcing structure for a concrete member capable of improving the effect of suppressing cracks.
[0006]
Another object of the present invention is to provide a reinforcing method and a reinforcing structure for a concrete member that can be easily constructed and can improve the proof strength against peeling of a fiber material.
[0007]
[Means for Solving the Problems]
In the present invention, in order to solve the above-described problem, a pair of jigs having both sides formed flat and having an arcuate surface at one end are arranged at both ends of the fiber material, and both ends of the fiber material are placed on one flat surface of the jig. The first step of extending along the arc surface, wrapping around the arc surface, extending along the other flat surface of the jig, and fixing to the jig on the other flat surface of the jig, and the tension device via the jig A second step of introducing tension to the fiber material; a third step of sticking the fiber material to the surface of the concrete member with an adhesive; and the tension device and the jig from the fiber material after the third step. There is provided a method for reinforcing a concrete member, which includes a fourth step of removing and a fifth step of fixing end reinforcing means for preventing peeling at both ends of the fiber material.
In the reinforcing method of the present invention, in the first step, since the fiber material is folded and wound around the arc surface of the jig, the tension force can be introduced without causing damage to the fiber material. The reinforcing method of the present invention can be applied to a concrete member of any existing or new structure.
[0008]
In the first step of the reinforcing method of the present invention, in order to fix both ends of the fiber material to the jig, for example, the fiber material and the jig may be bonded using an adhesive.
[0009]
In the first step, a jig having a plurality of corrugated irregularities on the upper surface and a presser plate having an irregular surface complementary to the corrugated irregularities are used, and both ends of the folded fiber material are corrugated on the jig. It may be fixed by extending to the unevenness and holding the fiber material between the uneven surfaces of the jig and the pressing plate. By using the jig having the corrugated uneven surface and the press plate in this way, the fiber material can be reliably held and fixed only by the pressing force without using an adhesive or the like.
[0010]
Further, in the present invention, a tension force is introduced and the fiber material adhered to the surface of the concrete member, and end reinforcing means provided at both ends of the fiber material to prevent the fiber material from peeling off from the concrete member. A reinforcing structure for a concrete member is provided. In addition, the said reinforcement structure is applicable also to the concrete member of any structure of the existing or new installation.
[0011]
Examples of the concrete member to which the present invention is applied include a column member, a slab member such as a floor slab, a beam, or a girder member. The fiber material is a prepreg impregnated with a carbon fiber sheet containing at least carbon fiber as a reinforcing fiber, a cloth and a resin. If desired, in addition to the carbon fiber as a reinforcing fiber, an organic material such as glass fiber or aramid fiber is used. A hybrid type in which one kind or plural kinds of fibers, nylon fibers, or polyester fibers are mixed can be used. Further, preferably, the hybrid type fiber material is formed in a sheet shape. Furthermore, as the edge reinforcing means, a metal plate such as the sheet-like fiber material or a steel plate can be used.
[0012]
【Example】
Hereinafter, although the example of the present invention is described with reference to an accompanying drawing, the present invention is not limited to this. FIGS. 1A to 1C are schematic views for explaining the first step of the present invention, FIG. 2 is a perspective view of a jig used in the present invention, and FIG. FIG. 3 is a side view showing a jig having a shape different from that of the jig shown in FIG. 2, and FIG. 3B is a side view showing a process of fixing the fiber material to the jig shown in FIG. 4 (a) is a plan view of the tensioning device used in the present invention, FIG. 4 (b) is a side view of the tensioning device, and FIGS. 5 (a) and 5 (b) are for explaining the fourth step. 6 (a) and 6 (b) are a plan view and a perspective view for explaining an end portion reinforcing means different from FIG.
[0013]
In the reinforcing structure of the present invention, a CFRP sheet 13 as a fiber material into which tension is introduced is stuck to the lower surface of the concrete beam 40, and the end reinforcing sheet 15 or the end reinforcing plate 16 is attached to both ends of the CFRP sheet 13. Fixed and formed.
Here, the CFRP sheet 13 is a carbon fiber reinforced plastic formed by impregnating a carbon fiber as a reinforcing fiber with a matrix resin such as an epoxy resin, and the carbon fiber uses a PNA fiber, a pitch fiber, or the like. can do. This CFRP sheet 13 can be produced using, for example, a tow sheet (trade name “FTS-C1-20” manufactured by Tonen Corporation). Then, the CFRP sheet 13 is attached to the lower surface of the concrete beam 40 in a state where tension is introduced. Therefore, tension force is transmitted from the CFRP sheet 13 to the concrete beam 40, and the reinforcing effect of the bending / shear strength and the effect of suppressing cracking can be improved.
[0014]
Further, the end portion reinforcing sheet 15 is made of a sheet similar to the CFRP sheet 13 and is longer than the width of the lower surface of the concrete beam 40 and can be folded back on both sides as shown in FIG. And bonded to the concrete beam 40 with an adhesive such as epoxy resin without introducing tension. In this way, by forming the end portion reinforcing sheet 15 and the CFRP sheet 13 as a single member without using a single piece, the tensioning step and the sticking step of the CFRP sheet 13, The workability of the sticking process can be improved. Moreover, the peeling prevention effect of the CFRP sheet 13 improves by sticking the edge part reinforcement sheet 15 continuously between the both sides | surfaces of the concrete beam 40. FIG.
[0015]
On the other hand, as the end reinforcing plate 16, a steel plate formed with a length equal to or larger than the width of the CFRP sheet 13 is used, and this is pressure-bonded and fixed to the concrete beam 40 by the anchor bolt 17 from above the CFRP sheet 13. The end reinforcing plate 16 may be fixed after an adhesive is applied to the contact surface with the CFRP sheet 13.
[0016]
Next, the concrete member reinforcing method of the present invention will be described.
In the first step, as shown in FIG. 1, the jig 12 is disposed at both ends of the CFRP sheet 13 having a predetermined length, and both ends of the CFRP sheet 13 are folded and fixed so as to be wound around the curved surface 12 b of the jig 12. That is, as shown in FIG. 2, the jig 12 is provided with a curved surface 12b at one end and provided with a pin hole 12a on the upper surface, and an epoxy adhesive is applied to the upper and lower surfaces and the curved surface 12b. Here, both ends of the CFRP sheet 13 are wound and pasted. Furthermore, on the CFRP sheet 13 adhered to the jig 12, the presser plate 11 in which the pin holes 11a are formed is adhered with an adhesive. The CFRP sheet 13 is appropriately formed with holes so that the pin holes 11a and 12a communicate with each other.
[0017]
Next, in the second step, tension is introduced into the CFRP sheet 13. Here, the apparatus for introducing the tension force is not particularly limited. For example, the tension apparatus 30 as shown in FIG. 4 can be used. That is, the tensioning device 30 includes a frame 31 having a size capable of enclosing the CFRP sheet 13 and tensioning shafts 32 and 32 provided at both ends of the frame 31, respectively. Are connected to each other, a hydraulic jack 35 is provided on the other tension shaft 32, a tension fixing nut 36 is disposed on the tension shaft 32 between the hydraulic jack 35 and the frame 31, and tension shafts 32, 32 are provided. Each of them has a pin 14 that can be inserted into the pin holes 12 a and 11 a of the jig 12 and the presser plate 11.
After inserting the pin 14 of the tensioning device 30 into the jig 12 fixed to the CFRP sheet 13 and the pin holes 12a and 11a of the presser plate 11, the hydraulic jack 35 is driven while measuring the tension load with the load cell 34, Pressure is applied to the CFRP sheet 13 by applying pressure to a predetermined tension load.
[0018]
In the third step, an epoxy resin adhesive is applied to one or both of the contact surfaces of the CFRP sheet 13 and the concrete beam 40 to which tension is introduced, and the CFRP sheet 13 is applied to the concrete beam 40. Adhere. The surface of the concrete beam 40 is ground in advance before the CFRP sheet 13 is adhered, and then a primer is applied to perform a ground treatment.
[0019]
When the adhesive is dried and the CFRP sheet 13 can be adhered to the concrete beam 40, the tensioning device 30, the jig 12 and the holding plate 11 are removed from the CFRP sheet 13 as the fourth step, and further the CFRP as the fifth step. In order to prevent the sheet 13 from peeling off, as shown in FIGS. 5 and 6, if the end portion reinforcing sheet 15 or the end portion reinforcing plate 16 is attached on both ends, the reinforcing work of the concrete beam 40 is completed.
[0020]
In the first step, the presser plate and the jig illustrated in FIGS. 3A and 3B may be used. The jig 22 has a plurality of corrugated irregularities 22 c formed on the upper surface thereof, and includes a through hole 21 a for inserting the pin 14. On the other hand, the pressing plate 21 has a concave and convex surface 21c having a shape complementary to the corrugated concave and convex 22c of the jig 22, and includes a pin hole 22a that communicates with the through hole 21a when contacting the jig 22. When the presser plate 21 and the jig 22 are used, the end portion of the CFRP sheet 13 is wound around the curved surface 22b of the jig 22 and the CFRP sheet 13 is attached to the jig 22 as shown in FIG. It is squeezed between the concave and convex surfaces 22c and 21c with the presser plate 21, and is crimped by a fixture such as a bolt (not shown). In this way, by using the jig 22 having the corrugated uneven surfaces 22c and 21c and the presser plate 21, the fiber material can be reliably secured only by the resistance and pressing force of the uneven surfaces without using an adhesive or the like. Thus, the jig 22 and the presser plate 21 can be used repeatedly.
[Brief description of the drawings]
FIGS. 1A to 1C are schematic views for explaining a first step of the present invention.
FIG. 2 is a perspective view of a jig used in the present invention.
3A is a side view showing a jig having a shape different from that shown in FIG. 2, and FIG. 3B is a side view showing a process of fixing a fiber material to the jig shown in FIG.
FIGS. 4A and 4B are a plan view and a side view of the tensioning device, respectively.
FIGS. 5A and 5B are perspective views for explaining a fourth step. FIGS.
FIGS. 6A and 6B are a plan view and a perspective view for explaining an end portion reinforcing means different from FIG.
[Explanation of symbols]
12 Jig 12b Curved surface of jig 13 CFRP sheet (fiber material)
15 End reinforcement sheet (end reinforcement means)
16 End reinforcement plate (End reinforcement means)
21 Presser plate 21c Corrugated surface 22 Jig 22c Corrugated surface 30 Tension device 40 Concrete beam (concrete member)

Claims (2)

  1. 両面が平らに形成され、一端に円弧面を有する一対の治具を繊維材の両端に配置し、繊維材の両端を治具の平らな一面に沿って延ばし、円弧面に巻き付けて折り返し、さらに治具の平らな他面に沿って延ばし、該平らな他面にて治具に固定する第1工程と、該治具を介して緊張装置により該繊維材に緊張力を導入する第2工程と、接着剤により該繊維材をコンクリート部材の表面に貼着する第3工程と、第3工程の後に該繊維材から該緊張装置及び該治具を取り外す第4工程と、該繊維材の両端に剥離防止のための端部補強手段を固定する第5工程とを含むコンクリート部材の補強方法。A pair of jigs having both sides formed flat and having an arc surface at one end are arranged at both ends of the fiber material, both ends of the fiber material are extended along one flat surface of the jig, wound around the arc surface and folded, A first step of extending along the other flat surface of the jig and fixing the jig to the jig on the other flat surface, and a second step of introducing a tension force to the fiber material by the tension device via the jig. A third step of adhering the fiber material to the surface of the concrete member with an adhesive, a fourth step of removing the tensioning device and the jig from the fiber material after the third step, and both ends of the fiber material And a fifth step of fixing an end reinforcing means for preventing peeling to the concrete member.
  2. 一方の面に複数の波形凹凸が形成され、他方の面が平らに形成され、一端に円弧面を有する一対の治具を繊維材の両端に配置し、繊維材の両端を治具の平らな一面に沿って延ばし、円弧面に巻き付けて折り返し、さらに治具の波形凹凸面に沿って延ばし、治具の波形凹凸面に対して相補な凹凸面を有する押え板と治具とで繊維材の端部を挟んで固定する第1工程と、該治具を介して緊張装置により該繊維材に緊張力を導入する第2工程と、接着剤により該繊維材をコンクリート部材の表面に貼着する第3工程と、第3工程の後に該繊維材から該緊張装置及び該治具を取り外す第4工程と、該繊維材の両端に剥離防止のための端部補強手段を固定する第5工程とを含むコンクリート部材の補強方法。A plurality of corrugations are formed on one surface, the other surface is formed flat, a pair of jigs having arcuate surfaces on one end are arranged at both ends of the fiber material, and both ends of the fiber material are flat on the jig Extend along one surface, wrap around a circular arc surface, fold back, further extend along the corrugated uneven surface of the jig, and presser plate and jig that have a corrugated surface complementary to the corrugated uneven surface of the jig. A first step of fixing the end portion between the ends, a second step of introducing a tension force to the fiber material by a tensioning device via the jig, and affixing the fiber material to the surface of the concrete member with an adhesive A third step, a fourth step of removing the tensioning device and the jig from the fiber material after the third step, and a fifth step of fixing end reinforcing means for preventing peeling at both ends of the fiber material; A method for reinforcing a concrete member including
JP35505097A 1997-12-24 1997-12-24 Reinforcement method of concrete member by fiber material tension Expired - Fee Related JP4004616B2 (en)

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JP2002070323A (en) * 2000-08-31 2002-03-08 Abekogyosho Co Ltd Concrete structural body reinforcing method and reinforced concrete structural body
JP2002097746A (en) * 2000-09-21 2002-04-05 Dps Bridge Works Co Ltd Frp reinforced materials with anchorage device
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DE10237968B3 (en) 2002-08-20 2004-02-05 Leonhardt, Andrä und Partner Beratende Ingenieure VBI GmbH Process for mounting a pre-stressed tension element on a concrete supporting framework comprises pre-stressing the tension element via a temporary anchor and then pressing the tension element onto the surface using a permanent anchor clamp
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