JPH10298930A - Reinforcing method for concrete structure - Google Patents
Reinforcing method for concrete structureInfo
- Publication number
- JPH10298930A JPH10298930A JP9108901A JP10890197A JPH10298930A JP H10298930 A JPH10298930 A JP H10298930A JP 9108901 A JP9108901 A JP 9108901A JP 10890197 A JP10890197 A JP 10890197A JP H10298930 A JPH10298930 A JP H10298930A
- Authority
- JP
- Japan
- Prior art keywords
- fiber sheet
- concrete structure
- continuous fiber
- reinforcing
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
- E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、橋梁や高架道路の
橋脚などの、コンクリート構造物を補強する方法に関
し、特に、鉄筋コンクリート柱状体等のコンクリート構
造物の基部に貼り付けた連続繊維シートの定着方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing a concrete structure such as a bridge or an elevated road pier, and more particularly, to fixing a continuous fiber sheet attached to a base of a concrete structure such as a reinforced concrete column. About the method.
【０００２】[0002]
【従来の技術】近年、橋梁や高架道路の橋脚などのコン
クリート構造物において、地震対策などにより、曲げ補
強を行うことが求められている。その一方法として、コ
ンクリート構造物の基部表面に、炭素繊維などの強化繊
維を配列した連続繊維シートをコンクリート構造物の軸
方向に沿うようにして貼付し補強する方法が提案されて
いる。2. Description of the Related Art In recent years, it has been demanded that concrete structures such as bridges and piers of elevated roads be bent and reinforced in order to prevent earthquakes. As one of the methods, a method has been proposed in which a continuous fiber sheet in which reinforcing fibers such as carbon fibers are arranged is adhered to the base surface of a concrete structure along the axial direction of the concrete structure to reinforce the sheet.
【０００３】しかしながら、かかる連続繊維シートをコ
ンクリート構造物の基部、即ち、コンクリート構造物と
他の基礎部材が形成する角部に近い部分に貼付する場合
に、かかる連続繊維シートを良好に定着する方法がなか
った。すなわち、たとえば、図１の断面図に示すよう
に、連続繊維シート（４）の下端部を、コンクリート構
造物（１）と他の例えば基礎部材（２）との間に形成さ
れる角部（３）で折り曲げて基礎部材（２）面上に貼付
し定着する方法では、コンクリート構造物に軸力および
曲げモーメントが生じた場合に、基礎部材上に貼付した
繊維シートが簡単に剥離しやすく補強が充分に発揮でき
ないという問題や、定着強度を高めるために定着区間
（９）を長くとらなければならない問題があった。However, when such a continuous fiber sheet is adhered to a base of a concrete structure, that is, a portion close to a corner formed by the concrete structure and other foundation members, a method of satisfactorily fixing the continuous fiber sheet. There was no. That is, for example, as shown in the cross-sectional view of FIG. 1, the lower end of the continuous fiber sheet (4) is formed by connecting a lower end of the continuous fiber sheet (4) to a corner formed between the concrete structure (1) and another base member (2) ( In the method in which the fiber sheet is bent in step 3) and adhered on the surface of the base member (2) to fix it, when an axial force and a bending moment are generated in the concrete structure, the fiber sheet adhered to the base member is easily peeled off and reinforced. There is a problem in that the fixing section (9) must be long in order to increase the fixing strength.
【０００４】また、繊維シート自身をコンクリート構造
物やその基礎部材にアンカー止めすることは不可能であ
ることから、別途コンクリート構造物基部に巻き付けた
鋼板に、繊維シートを接着させ、鋼板をブラケットを介
して基礎部材にアンカー止めする方法が考えられるが、
やはり、定着強度を高めるために接着区間を長く取らな
ければならず、定着が充分でない問題があった。Further, since it is impossible to anchor the fiber sheet itself to a concrete structure or its foundation member, the fiber sheet is bonded to a steel sheet separately wound around the base of the concrete structure, and the steel sheet is attached to a bracket. There is a method of anchoring to the foundation member through
After all, in order to increase the fixing strength, it is necessary to take a long bonding section, and there is a problem that fixing is not sufficient.
【０００５】[0005]
【発明が解決しようとする課題】したがって、本願発明
の目的は、簡便な方法で、コンクリート構造物の基部に
貼付した連続繊維シートの剥離を防ぎ、充分な定着強度
を具備させることによって、補強用連続繊維シートの補
強効果を充分に発揮させることを可能としたコンクリー
ト構造物の補強方法を提供するものである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to prevent the continuous fiber sheet attached to the base of a concrete structure from being peeled off by a simple method, and to provide a sufficient fixing strength to provide reinforcement. An object of the present invention is to provide a method for reinforcing a concrete structure, which makes it possible to sufficiently exert the reinforcing effect of a continuous fiber sheet.
【０００６】[0006]
【課題を解決するための手段】本願発明は、上記課題を
解決することを目的とし、その要旨は、コンクリート構
造物の表面に連続繊維シートを貼付して補強するコンク
リート構造物の補強方法において、コンクリート構造物
の基部表面に貼付した連続繊維シートの端部を、曲面を
有する部材に巻き、該曲面を有する部材を固定すること
を特徴とするコンクリート構造物の補強方法にあり、更
に好ましくは、該曲面を有する部材をコンクリート構造
物の基礎部材に固定することを特徴とするコンクリート
構造物の補強方法、更には、該連続繊維シートを曲面を
有する部材に接着してなることを特徴とするコンクリー
ト構造物の補強方法にある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and the gist of the present invention is to provide a method for reinforcing a concrete structure in which a continuous fiber sheet is attached to the surface of the concrete structure to reinforce the concrete structure. An end of the continuous fiber sheet attached to the base surface of the concrete structure is wound around a member having a curved surface, and the method for reinforcing a concrete structure is characterized by fixing the member having the curved surface. A method for reinforcing a concrete structure, wherein the member having the curved surface is fixed to a foundation member of the concrete structure, and further, a concrete comprising bonding the continuous fiber sheet to a member having a curved surface. In the method of reinforcing structures.
【０００７】[0007]
【発明の実施の形態】以下、本発明を詳細に説明する。
図２は、本発明の補強方法の一例を示す斜視図であり、
図３は、その横断面図である。また、図４には、本発明
の補強方法の他の一例を示す斜視図を示す。本発明にお
いて、コンクリート構造物（１）としては、図に示すい
わゆる角柱の橋脚だけでなく、道路床板などの板状のも
のなどが挙げられ、その基部とは、かかるコンクリート
構造物が他の部材、例えば基礎部材（２）と交差して角
部（３）を形成する部分に近い部分をいう。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
FIG. 2 is a perspective view showing an example of the reinforcing method of the present invention,
FIG. 3 is a cross-sectional view thereof. FIG. 4 is a perspective view showing another example of the reinforcing method of the present invention. In the present invention, examples of the concrete structure (1) include not only a so-called prismatic pier shown in the figure but also a plate-like structure such as a road floor plate. For example, a portion close to a portion forming a corner (3) by intersecting with the base member (2).
【０００８】本発明では、コンクリート構造物（１）の
表面に、補強用の連続繊維シート（４）を貼付する。曲
げ補強を目的とする場合には、連続繊維の繊維配列方向
が、コンクリート構造物の軸方向に沿うようにして連続
繊維シート貼付することが好ましい。かかる連続繊維シ
ート（４）の強化繊維としては、炭素繊維、ガラス繊
維、ボロン繊維、スチール繊維、アラミド繊維、ポリエ
ステル繊維、ポリエチレン繊維など、各種の繊維を用い
ることができるが、特に、炭素繊維を用いることが好ま
しい。また、立設するコンクリート柱状体の下部の曲げ
補強のためには、下端部から塑性ヒンジ区間に至る間
に、破断ひずみが２０，０００μｍ以上（ＪＩＳＲ ７
０７３法測定）の繊維シートを用い、その上部には鉄筋
と同等以上の引張弾性率（ＪＩＳ Ｒ ７０７３法測
定）、具体的には、引張弾性率が２．１×１０6ｋｇｆ
／ｃｍ2以上の繊維シートを用いることが好ましい。In the present invention, a continuous fiber sheet (4) for reinforcement is attached to the surface of the concrete structure (1). When the purpose is bending reinforcement, it is preferable to attach a continuous fiber sheet so that the fiber arrangement direction of the continuous fibers is along the axial direction of the concrete structure. As the reinforcing fiber of the continuous fiber sheet (4), various fibers such as carbon fiber, glass fiber, boron fiber, steel fiber, aramid fiber, polyester fiber, and polyethylene fiber can be used. Preferably, it is used. In addition, in order to reinforce the lower part of the concrete column to be erected, a breaking strain of 20,000 μm or more (JISR 7) is required from the lower end to the plastic hinge section.
073 method), and a tensile elastic modulus equal to or higher than that of a reinforcing bar (measured by JIS R 7073 method), specifically, a tensile elastic modulus of 2.1 × 10 6 kgf
/ Cm 2 or more is preferably used.
【０００９】繊維シートとしては、繊維に予めマトリク
ス樹脂を含浸させたプリプレグシートを用いても良い
し、繊維のドライシートを用いても良いが、プリプレグ
シートを用いる方が好ましい。プリプレグシートに含浸
させる樹脂としては、エポキシ樹脂、不飽和ポリエステ
ル樹脂、ポリウレタン樹脂などの熱硬化性樹脂あるいは
常温硬化性樹脂が挙げられるが、特に二液硬化型の常温
硬化性樹脂が好ましい。As the fiber sheet, a prepreg sheet in which fibers are impregnated with a matrix resin in advance may be used, or a dry sheet of fibers may be used, but it is preferable to use a prepreg sheet. Examples of the resin to be impregnated into the prepreg sheet include a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, and a polyurethane resin or a room temperature-curable resin, and a two-pack curing room-temperature curable resin is particularly preferable.
【００１０】また、シートとしては、繊維の長繊維を一
方向に配列した一方向シートが好ましいが、一方向に配
列した繊維に他方向に配列した繊維を組み合わせた織物
シートを用いても良い。本発明においては、かかるコン
クリート構造物の基部表面に貼付した連続繊維シート
（４）の端部を、曲面を有する部材（５）に巻き、その
曲面を有する部材を固定することにより、連続繊維シー
ト（４）の定着を行う。The sheet is preferably a unidirectional sheet in which long fibers are arranged in one direction, but a woven sheet in which fibers arranged in one direction are combined with fibers arranged in the other direction may be used. In the present invention, the end of the continuous fiber sheet (4) attached to the base surface of the concrete structure is wound around a member (5) having a curved surface, and the member having the curved surface is fixed, whereby the continuous fiber sheet is fixed. The fixing of (4) is performed.
【００１１】本発明でいう、曲面を有する部材（５）と
は、長さ方向に同一の断面形状を有する筒状又は柱状の
部材であって、その表面のうち、少なくとも連続繊維シ
ートと接触する部位が曲面である部材を意味し、例えば
図２及び図３に示す様に、断面が円形のロール体や、図
４に示す様な、断面が馬蹄形の部材や、その他、断面が
楕円形のロール体などが挙げられる。そして、その長さ
としては、少なくとも繊維シートの幅と同等又はそれ以
上の長さをもつことが好ましく、曲面部分の曲率半径が
３０ｍｍ以上のものを用いることが、その表面に巻く繊
維の破断を防止することを考慮する上で好ましい。曲面
を有する部材の材質には特に制限がないが、鉄、ステン
レス等の金属やＦＲＰなどを用いることができる。The member (5) having a curved surface in the present invention is a cylindrical or columnar member having the same cross-sectional shape in the longitudinal direction, and at least one of the surfaces thereof is in contact with the continuous fiber sheet. The member means a member having a curved surface. For example, as shown in FIGS. 2 and 3, a roll body having a circular cross section, a member having a horseshoe-shaped cross section as shown in FIG. Roll bodies and the like can be mentioned. It is preferable that the length is at least equal to or longer than the width of the fiber sheet. It is preferable in consideration of prevention. The material of the member having a curved surface is not particularly limited, but a metal such as iron or stainless steel, FRP, or the like can be used.
【００１２】そして、本発明でいう、曲面を有する部材
に連続繊維シートを巻く、とは、曲面を有する部材の少
なくとも一部に連続繊維シートを接触させることを意味
するが、その場合には、好ましくは、接着樹脂を用い
て、連続繊維シートと曲面を有する部材を、接着させる
ことが好ましい。又、曲面を有する部材が全断面が曲面
であるロール体である場合には、曲面を有する部材に連
続繊維シートを１回以上巻き、好ましくは接着すること
により、更なる定着効果を得ることが出来るので好まし
い。In the present invention, winding a continuous fiber sheet around a member having a curved surface means that the continuous fiber sheet is brought into contact with at least a part of the member having a curved surface. Preferably, the continuous fiber sheet and the member having the curved surface are preferably bonded using an adhesive resin. Further, when the member having a curved surface is a roll having a curved entire cross section, a further fixing effect can be obtained by winding the continuous fiber sheet around the member having the curved surface one or more times, preferably by bonding. It is preferable because it is possible.
【００１３】曲面を有する部材（５）は、コンクリート
構造物（１）とその基礎部材（２）との間に形成される
角部（３）にほぼ密着して、コンクリート構造物（１）
及び／又はその基礎部材（２）に固定される。特に、曲
げ補強を行う場合には、基礎部材に固定する方法を採用
する。曲面を有する部材の固定方法は、特に限定される
ものではないが、例えば図３に示すように、ワッシャー
（７）を介して、曲面を有する部材（５）を貫通するア
ンカーボルト（６）で、基礎部材（２）に固定する方法
などが挙げられる。又、図４に示す様に、曲面を有する
部材（５）を押さえ部材（１０）で固定し、押さえ部材
（１０）を基礎部材（２）に固定する方法などが挙げら
れる。The member (5) having a curved surface is almost in close contact with a corner (3) formed between the concrete structure (1) and its foundation member (2), and the concrete structure (1)
And / or fixed to its base member (2). In particular, when performing bending reinforcement, a method of fixing to a base member is adopted. The method of fixing the member having the curved surface is not particularly limited. For example, as shown in FIG. 3, an anchor bolt (6) penetrating the member (5) having the curved surface via a washer (7). And a method of fixing to the base member (2). In addition, as shown in FIG. 4, a method of fixing a member (5) having a curved surface with a pressing member (10) and fixing the pressing member (10) to the base member (2) can be used.
【００１４】このように、本願発明において、コンクリ
ート構造物の基部に貼付した連続繊維シートの端部を曲
面を有する部材に巻き、該曲面を有する部材を固定する
方法を採用することにより、コンクリート構造物に軸力
や曲げモーメントが付加され、繊維シートを引っ張る方
向に応力が生じた場合でも、繊維シートの剥離が生じに
くく、また、応力が分散されるため、繊維シートの破断
が生じにくく、更に、長い定着区間を必要とせずにきわ
めて簡便に連続繊維シートを定着することができるた
め、補強用の連続繊維シートによる補強効果が、充分に
発揮される。As described above, according to the present invention, the end of the continuous fiber sheet attached to the base of the concrete structure is wound around a member having a curved surface, and the method of fixing the member having the curved surface is employed. Even when an axial force or a bending moment is applied to the object and a stress is generated in the direction in which the fiber sheet is pulled, the fiber sheet is hardly peeled off, and since the stress is dispersed, the fiber sheet is hardly broken, Since the continuous fiber sheet can be fixed very easily without requiring a long fixing section, the reinforcing effect of the reinforcing continuous fiber sheet is sufficiently exhibited.
【００１５】本願発明の補強方法の概略を説明すると、
まず、プリプレグシート又はドライシートからなる上記
連続繊維シートを用意し、一方、補強されるコンクリー
ト構造物（１）の表面に、必要ならば、下地処理、プラ
イマー処理を行う。その後、連続繊維シートを、接着樹
脂、好ましくは常温硬化性の接着樹脂を用いて被補強表
面に貼付していく。一方、連続繊維シートの下端部は曲
面を有する部材（５）に接着樹脂を付与しながら巻き付
ける。その後、曲面を有する部材（５）をアンカーボル
ト（６）を用いて基礎部材（２）に固定させる。その
後、必要な仕上げ処理を行い、好ましくは、鉄筋コンク
リート柱状体の根本部分に、根巻コンクリート（８）を
打設し補強を行う。The outline of the reinforcing method of the present invention is as follows.
First, the continuous fiber sheet made of a prepreg sheet or a dry sheet is prepared. On the other hand, a surface treatment and a primer treatment are performed on the surface of the concrete structure (1) to be reinforced, if necessary. Thereafter, the continuous fiber sheet is attached to the surface to be reinforced using an adhesive resin, preferably an adhesive resin which is curable at room temperature. On the other hand, the lower end portion of the continuous fiber sheet is wound around a member (5) having a curved surface while applying an adhesive resin. Thereafter, the member (5) having a curved surface is fixed to the base member (2) using the anchor bolt (6). Thereafter, a necessary finishing treatment is performed, and preferably, a root-wrapped concrete (8) is poured into the root portion of the reinforced concrete column to reinforce it.
【００１６】[0016]
【発明の効果】このように、本願発明においては、コン
クリート構造物の基部に貼付した繊維シートの端部を曲
面を有する部材に巻き、該曲面を有する部材を固定する
方法を採用することにより、繊維シートを引っ張る方向
に応力が生じた場合でも、繊維シートの剥離が生じにく
く、また、応力が分散されるため、繊維シートやコンク
リート構造物の破断が生じにくく、更に、長い定着区間
を必要とせずにきわめて簡便に連続繊維シートを定着す
ることができるため、補強用の連続繊維シートによる補
強効果が、充分に発揮される。As described above, the present invention employs a method of winding the end of the fiber sheet attached to the base of the concrete structure around a member having a curved surface and fixing the member having the curved surface. Even when stress is generated in the direction of pulling the fiber sheet, the fiber sheet is hardly peeled off and the stress is dispersed, so that the fiber sheet or concrete structure is hardly broken, and a long fixing section is required. Therefore, since the continuous fiber sheet can be fixed very easily without using the reinforcing fiber sheet, the reinforcing effect of the reinforcing continuous fiber sheet is sufficiently exhibited.
【図１】従来のコンクリート補強方法の一例を示す断面
図FIG. 1 is a sectional view showing an example of a conventional concrete reinforcing method.
【図２】本願発明のコンクリート補強方法の一例を示す
斜視図FIG. 2 is a perspective view showing an example of the concrete reinforcing method of the present invention.
【図３】本願発明のコンクリート補強方法の一例を示す
断面図FIG. 3 is a sectional view showing an example of the concrete reinforcing method of the present invention.
【図４】本願発明のコンクリート補強方法の一例を示す
斜視図FIG. 4 is a perspective view showing an example of the concrete reinforcing method of the present invention.
１：コンクリート構造物、２：基礎部材、３：角部、
４：連続繊維シート、５：ロール体、６：アンカーボル
ト、７：ワッシャー、８：根巻コンクリート、９：定着
区間、１０：押さえ部材1: concrete structure, 2: foundation member, 3: corner,
4: continuous fiber sheet, 5: roll body, 6: anchor bolt, 7: washer, 8: root-mound concrete, 9: fixing section, 10: holding member
Claims (5)
ートを貼付して補強するコンクリート構造物の補強方法
において、コンクリート構造物の基部表面に貼付した連
続繊維シートの端部を、曲面を有する部材に巻き、該曲
面を有する部材を固定することを特徴とするコンクリー
ト構造物の補強方法。1. A method for reinforcing a concrete structure in which a continuous fiber sheet is attached to a surface of a concrete structure to reinforce the concrete structure, wherein an end of the continuous fiber sheet attached to a base surface of the concrete structure is converted into a member having a curved surface. A method for reinforcing a concrete structure, comprising winding and fixing a member having the curved surface.
物の基礎部材に固定することを特徴とする請求項１記載
のコンクリート構造物の補強方法。2. The method for reinforcing a concrete structure according to claim 1, wherein the member having the curved surface is fixed to a foundation member of the concrete structure.
接着してなることを特徴とする請求項１又は２記載のコ
ンクリート構造物の補強方法。3. The method for reinforcing a concrete structure according to claim 1, wherein a continuous fiber sheet is bonded to the member having the curved surface.
ール体であることを特徴とする請求項１乃至３記載のコ
ンクリート構造物の補強方法。4. The method for reinforcing a concrete structure according to claim 1, wherein the member having the curved surface is a roll having a circular cross section.
部材であることを特徴とする請求項１乃至３記載のコン
クリート構造物の補強方法。5. The method for reinforcing a concrete structure according to claim 1, wherein the member having the curved surface is a member having a horseshoe cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9108901A JPH10298930A (en) | 1997-04-25 | 1997-04-25 | Reinforcing method for concrete structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9108901A JPH10298930A (en) | 1997-04-25 | 1997-04-25 | Reinforcing method for concrete structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10298930A true JPH10298930A (en) | 1998-11-10 |
Family
ID=14496508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9108901A Pending JPH10298930A (en) | 1997-04-25 | 1997-04-25 | Reinforcing method for concrete structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10298930A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006257669A (en) * | 2005-03-15 | 2006-09-28 | Toyobo Co Ltd | Concrete member excellent in explosion-proof properties |
| JP2007162322A (en) * | 2005-12-13 | 2007-06-28 | East Japan Railway Co | Method of reinforcing structure |
| JP2008143001A (en) * | 2006-12-08 | 2008-06-26 | East Japan Railway Co | Method for reinforcing structure and fixing implement |
| CN102418318A (en) * | 2010-09-27 | 2012-04-18 | 同济大学 | Anchoring device and anchoring method for fiber reinforced plastic (FRP) cloth |
-
1997
- 1997-04-25 JP JP9108901A patent/JPH10298930A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006257669A (en) * | 2005-03-15 | 2006-09-28 | Toyobo Co Ltd | Concrete member excellent in explosion-proof properties |
| JP2007162322A (en) * | 2005-12-13 | 2007-06-28 | East Japan Railway Co | Method of reinforcing structure |
| JP2008143001A (en) * | 2006-12-08 | 2008-06-26 | East Japan Railway Co | Method for reinforcing structure and fixing implement |
| CN102418318A (en) * | 2010-09-27 | 2012-04-18 | 同济大学 | Anchoring device and anchoring method for fiber reinforced plastic (FRP) cloth |
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