JP4041708B2

JP4041708B2 - Reinforcement method of pier cross beam

Info

Publication number: JP4041708B2
Application number: JP2002217828A
Authority: JP
Inventors: 浩三上; 富雄田村
Original assignee: Sumitomo Mitsui Construction Co Ltd
Current assignee: Sumitomo Mitsui Construction Co Ltd
Priority date: 2002-07-26
Filing date: 2002-07-26
Publication date: 2008-01-30
Anticipated expiration: 2022-07-26
Also published as: JP2004060213A

Description

【０００１】
【発明の属する技術分野】
本発明は、道路や鉄道等の橋脚横梁の補強方法に係り、特に、上面に支承や落橋防止装置等が配置された橋脚横梁を補強するのに好適な橋脚横梁の補強方法に関する。
【０００２】
【従来の技術】
ラーメン橋脚横梁に代表される橋脚横梁には、橋脚横梁の上面に支承や落橋防止装置等が配置されている。このため、橋脚等の柱状部のように、鋼板や強化繊維シートで橋脚横梁を完全に包み込んで補強することができない。また、仮に支承や落橋防止装置等が無くとも、横梁上面と橋梁上部工などの構築物下面との隙間が狭く、横梁の幅が広いことから、人力での作業が困難であり、強化シートに樹脂を良好に含浸し、硬化させる際の施工品質の確保は極めて困難である。
【０００３】
このため、炭素繊維、ガラス繊維、ボロン、チタン、スチール等の無機繊維、アラミド、ポリエステル、ナイロン等の有機繊維を一種もしくは複数種混入して形成された強化繊維シートを、橋脚横梁の両側面と下面にＵ字状に配置し、該強化繊維シートに、常温硬化型エポキシ樹脂、熱硬化型エポキシ樹脂、ポリエステル系樹脂、ポリアミド樹脂、ポリカーボネイト樹脂等の樹脂を含浸させて、該強化繊維シートを橋脚横梁に接着すると共に硬化させて、橋脚横梁を補強することが行なわれていた。
【０００４】
通常、コンクリート構造物の補強設計を行なう場合、対象となるコンクリート構造物に強化繊維シートを完全に巻き付けた状態の補強効率を求め、前記のように強化繊維シートをＵ字状に巻き付けた場合でも完全に巻き付けた場合と同等の補強効率が得られるものとして補強設計を行なっていた。
【０００５】
【発明が解決しようとする課題】
強化繊維シートを橋脚横梁にＵ字状に巻きつける補強方法は、施工が簡便であるが、強化繊維シートを橋脚横梁に完全に巻き付けていないため、その補強効率は、橋脚横梁に強化繊維シートを完全に巻き付けた場合の補強効率の半分程度と低いものになる。
【０００６】
即ち、強化繊維シートをＵ字状に巻きつけて補強した場合、強化繊維シートに樹脂を含浸させ硬化させているとしても、Ｕ字状の開口部を押し広げる力が作用した場合、硬化している強化繊維シートの開口部が開き橋脚横梁にクラックが発生しやすい。このため、設計時に想定したせん断耐力が期待できず、地震時に橋脚横梁のせん断破壊が発生する危険性があり、強化繊維シートを完全に巻き付けることができない橋脚横梁を、簡便に、かつ確実に補強することができる補強方法の開発が望まれていた。
【０００７】
前記の事情に鑑み、本発明は、支承や落橋防止装置等が配置され、強化繊維シートを完全に巻き付けることができない橋脚横梁を、簡便、かつ確実に補強することができる橋脚横梁の補強方法を提供することを目的とする。
【０００８】
【課題を解決するための手段】
請求項１に係る発明は、上面に落橋防止装置（５）又は支承（３）が配置された橋脚横梁（２）を強化繊維シートによって補強する、橋脚横梁の補強方法において、
該橋脚横梁の長手方向に沿った区間であって、前記落橋防止装置（５）又は支承（３）が配置されている区間及び前記落橋防止装置（５）又は支承（３）が配置されていない区間に亘って、該橋脚横梁の両側面（２ｂ）及び下面（２ｃ）を覆うようにＵ字状に強化繊維シート（７）を巻き付け、
該強化繊維シート（７）に樹脂を含浸させて該両側面（２ｂ）及び下面（２ｃ）に接着し、
樹脂を含浸させて硬化させたプレキャスト部（１１、１６）を中央に有して未硬化部（１２、１７）を両端に有する補強帯（１０、１５）の前記プレキャスト部（１１、１６）に接着剤（１３）を塗布し、
前記橋脚横梁の上面であって前記落橋防止装置（５）又は支承（３）が配置されていない区間の平坦部分に前記接着剤（１３）を介して接着されるように前記プレキャスト部（１１、１６）を配置し、
前記落橋防止装置（５）又は支承（３）が配置されていない区間における前記橋脚横梁の両側面（２ｂ）及び下面（２ｃ）に、前記Ｕ字状に巻き付けられた強化繊維シート（７）の上から巻き付けるように前記補強体（１０、１５）の未硬化部（１２、１７）を配置し、
該未硬化部（１２、１７）に樹脂を含浸させるようにすることを特徴とする。
【０００９】
請求項２に係る発明は、前記補強帯（１０、１５）は、強化繊維で帯状に、しかも前記橋脚横梁の軸直角断面における外周長よりも長く形成され、
その中央部に形成された前記プレキャスト部（１１、１６）は、前記橋脚横梁の上面の幅よりも短い長さに形成されたことを特徴とする。
【００１２】
なお、括弧内の符号等は、図面と対照するためのものであり、これは、発明の理解を容易にするための便宜的なものであって、特許請求の範囲に何等影響を及ぼすものではない。
【００１３】
【発明の効果】
請求項１及び２に係る発明によると、橋脚横梁にＵ字状に巻き付けた強化繊維シートの上から補強帯を巻き付けて固定するようにしているので、補強帯で強化繊維シートのＵ字状の開口部の広がりを抑制することが出来、橋脚横梁のせん断耐力を大幅に向上させることができる。また、補強帯は、予め硬化処理されたプレキャスト部を橋脚横梁の上に載置して橋脚横梁に巻き付け、樹脂を含浸させるだけであるので、施工が容易であり、施工品質を確保することができる。
【００１７】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００１８】
図１ないし図４は、本発明の実施の形態を示すもので、図１は、本発明の補強方法によって補強された橋脚横梁の側面図、図２は、図１のＡ−Ａ断面図、図３は、図１のＢ−Ｂ断面図、図４は、図１における補強帯の展開図である。
【００１９】
図１に示すように、所定の間隔で立設されたラーメン橋脚１の上端には、橋脚横梁２が一体に形成されている。該橋脚横梁２の上面２ａには、支承３と落橋防止装置５等が配置され、該支承３で橋梁上部工６が支承され、落橋防止装置５で落下が防止されるようになっている。なお、橋脚横梁２の上面２ａと橋梁上部工６の下面６ａとの間隔Ｇは、通常３０〜４０ｃｍ程度になっている。
【００２０】
図２に示すように、前記橋脚横梁２の外周に、橋脚横梁２の両側面２ｂ及び下面２ｃを覆うように、強化繊維を布状に織り上げた柔軟な強化繊維シート７が巻き付けられ、樹脂が含浸されて橋脚横梁２に接着、硬化されている。なお、強化繊維シート７は、橋脚横梁２の上面に寸法ｌだけ被さるように巻き付けられている。従って、橋脚横梁２の幅をＬ１とすると、橋脚横梁２の上面２ａには、強化繊維シート７が巻きつけられていない幅Ｌ２（Ｌ１−２ｌ）の開口部８が発生する。
【００２１】
図３に示すように、前記橋脚横梁２の上面２ａと前記強化繊維シート７の外周には、橋脚横梁２の上面２ａと対向する位置に、可撓性を有する強化繊維シートに予め樹脂が含浸され硬化させたプレキャスト部１１と、その両端に未硬化部１２が形成され、該プレキャスト部１１に接着剤１３が塗布された補強帯１０が、橋脚横梁２の図１で軸心方向である左右方向に、間隔ＬＭ（ＬＭ１、ＬＭ２、ＬＭ３）を置いて複数個（図１の場合、４個）設置されている。
【００２２】
該補強帯は、その未硬化部１２（施工前においては樹脂が含浸されておらず、強化繊維シートからなる柔軟性（可撓性）を有する部分の意、施工中に樹脂が含浸されプレキャスト部１１と同様に硬化する。）の端部が橋脚横梁２の下面２ｃで重なるように巻き付けられ、未硬化部１２に樹脂が含浸されて、前記強化繊維シート７の外周面に接着、硬化されている。このとき、プレキャスト部分１１は、接着剤１３により橋脚横梁２の上面２ａに接着固定される。
【００２３】
前記補強帯１０は、図４に示すように、幅Ｗ、長さＬ５の帯状に形成され、その中央部のプレキャスト部１１は長さＬ３に形成されている。前記補強帯１０の幅Ｗは、図１に示すように、橋脚横梁２の上面２ａに配置される支承３や落橋防止装置５などの配置間隔Ｐよりも小さく形成されている。また補強帯１０の長さＬ５は、図３に示すように、橋脚横梁２に強化繊維シート７を巻き付けた状態で、強化繊維シート７の幅をＬ４、高さをＨ、補強帯１０の両端の重ね量をｌ２とすると、Ｌ５＝２（Ｌ４＋Ｈ）＋ｌ２に形成されている。即ち、橋脚横梁の軸直角断面における外周長（≒２（Ｌ４＋Ｈ））よりも長い帯状に形成されている。なお、補強帯１０の両端を重ね合わせる長さｌ２は、１０ｃｍ程度あればよい。

【００２４】
また、前記補強帯１０のプレキャスト部１１の長さＬ３は、図２に示す橋脚横梁２の上面２ａの幅Ｌ１より短く、強化繊維シート７の開口部８の幅より長く（Ｌ１＜Ｌ３＜Ｌ２）なるように形成されている。前記プレキャスト部１１の少なくとも一方の面には、図４に示すように、施工時に接着剤を塗布すべき領域として、長さＬ６、幅Ｗ２なる接着剤塗布領域ＡＲＡが形成されている。この接着剤塗布領域ＡＲＡに、施工現場で塗布する接着剤１３の塗布長さＬ６は、図２に示す強化繊維シート７の開口部８の長さＬ２と略同じ長さＬ６≒Ｌ２でよい
【００２５】
前記のように、支承３や落橋防止装置５が配置されている橋脚横梁２に強化繊維シート７をＵ字状に巻き付け、該強化繊維シート７に樹脂を含浸させて、橋脚横梁２に接着、硬化させる。次に、プレキャスト部分１１が形成された補強帯１０を巻き付けて、プレキャスト部分１１を接着剤１３で橋脚横梁２の上面２ａに接着し、未だ樹脂が含浸されず強化繊維シートからなる柔軟な可撓性を有する未硬化部分１２を、図３に示すように、橋脚横梁２の周囲を被覆する形で巻きつけ、該未硬化部分１２に樹脂を含浸させて強化繊維シート７に接着固定する。更に、図３で橋脚横梁２の下部の補強帯１０の両端部１０ａ、１０ａを重ね合わせて樹脂を含浸させ閉鎖環状に一体にして硬化させることにより、補強帯１０の巻き付け強度を向上させることができる。
【００２６】
地震等により橋脚横梁２に外力が作用した場合、閉鎖環状に設置、固定された補強帯１０により強化繊維シート７の開口部８の広がりを防止することができ、強化繊維シート７だけでＵ字状に補強した場合に比べ、橋脚横梁２のせん断耐力を大幅に増大させることができる。なお、本実施の形態において、橋脚横梁２に巻き付ける補強帯１０の数をｎ、幅をＷとすると、橋脚横梁２に巻きつけた補強帯１０の橋脚横梁２の軸方向の総延長Ｍは、Ｍ＝ｎ×Ｗ（図１の場合、Ｍ＝４Ｗ）になる。この補強帯１０を巻きつける総延長Ｍは、橋脚横梁２のせん断区間の長さＬ７（図１参照、ラーメン橋脚１、１間の長さ）の１／９程度あれば橋脚横梁２のせん断耐力を大幅に向上させることができる。
【００２７】
図５及び図６は、本発明の第２の実施の形態を示すもので、図５は、図１のＢ−Ｂ断面図、図６は、図５における補強帯の展開図である。
【００２８】
同図において、図１乃至図４と同じものは同じ符号をつけて示し説明を省略する。図６に示すように、補強帯１５は、主帯１５ａと副帯１５ｂで構成され、主帯１５ａには、施工前に予め強化繊維シートを樹脂で含浸固化させたプレキャスト部１６が形成され、その両端に未だ樹脂が含浸されていない柔軟な可撓性を有する強化繊維シートからなる未硬化部１７がつながっている。
【００２９】
そして、図５に示すように、主帯１５ａのプレキャスト部１６に接着剤１３を塗布した状態で橋脚横梁２の上面２ａに載置し固定し、両側の未硬化部１７を橋脚横梁２の側面２ｂに巻き付けられた強化繊維シート７の側面に巻き付け、樹脂を含浸させて、強化繊維シート７に接着させる。
【００３０】
主体１５ａの接着が終了したら、橋脚横梁２の下面２ｃに巻き付けられた強化繊維シート７に、柔軟な可撓性を有する強化繊維シートからなる副帯１５ｂの中央部を当て、樹脂を含浸させて接着した後、その両側を橋脚横梁２の側面２ｂに沿って立上げ、主帯１５ａの両端部１５ｃ、１５ｃと重ね合わせて樹脂を含浸させ、主帯１５ａと副帯１５ｂを一体に接合して、閉鎖環状に硬化させる。
【００３１】
なお、図６に示すように、主帯１５ａ及び副帯１５ｂは、幅Ｗ、長さＬ８に形成されている。この主帯１５ａと副帯１５ｂの長さＬ８は、図５に示すように、橋脚横梁２に巻き付けられた強化繊維シート７の幅をＬ４、高さをＨ、重ね合わせ部の長さをｌ２とすると、Ｌ８＝Ｌ４＋Ｈ＋ｌ２になる。
【００３２】
このような構成としても、前記実施の形態と同様の効果を得ることができる。また、主帯１５ａと副帯１５ｂの長さＬ８を短くすることができ、補強工事の施工時に、主帯１５ａ、副帯１５ｂの取り扱いを容易にすることができ、作業性を向上させることができる。
【図面の簡単な説明】
【図１】本発明の補強方法によって補強された橋脚横梁の側面図。
【図２】図１のＡ−Ａ断面図。
【図３】図１のＢ−Ｂ断面図。
【図４】図１における補強帯の展開図。
【図５】本発明の他の実施形態を示す、図１のＢ−Ｂ断面図。
【図６】図５における補強帯の展開図。
【符号の説明】
２…橋脚横梁
２ａ…上面
２ｂ…側面
２ｃ…下面
３…支承
５…落橋防止装置
７…強化繊維シート
１０…補強帯
１１…プレキャスト部
１２…未硬化部
１３…接着剤
１５…補強帯
１５ａ…主帯
１５ｂ…副帯
１６…プレキャスト部
１７…未硬化部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of reinforcing piers cross beam of roads and railways, particularly, to a method of reinforcing a suitable piers cross beams to reinforce the pier transverse beam like support and girder prevention device is disposed on the top surface.
[0002]
[Prior art]
The piers cross beam typified by rigid frame piers crossbeam, top to support and girder prevention apparatus or the like for a pier cross beam is disposed. For this reason, like a columnar part such as a bridge pier, the bridge pier horizontal beam cannot be completely wrapped and reinforced with a steel plate or a reinforcing fiber sheet. Also, even if there is no support or falling bridge prevention device etc. , the gap between the upper surface of the cross beam and the lower surface of the structure such as the bridge superstructure is narrow and the width of the cross beam is wide, so it is difficult to work manually and the reinforcing sheet is made of resin. It is extremely difficult to ensure the construction quality when the resin is impregnated and cured well.
[0003]
For this reason, reinforcing fiber sheets formed by mixing one or more organic fibers such as carbon fibers, glass fibers, boron, titanium, steel, and other inorganic fibers, aramid, polyester, nylon, etc. Arranged in a U-shape on the lower surface, impregnating the reinforcing fiber sheet with a resin such as a room temperature curable epoxy resin, a thermosetting epoxy resin, a polyester resin, a polyamide resin, a polycarbonate resin, etc. Adhesion to the cross beam and hardening were performed to reinforce the cross beam on the pier.
[0004]
Usually, when performing reinforcement design of a concrete structure, the reinforcement efficiency in a state in which the reinforcing fiber sheet is completely wound around the target concrete structure is obtained, and even when the reinforcing fiber sheet is wound in a U shape as described above Reinforcement design was performed assuming that the same reinforcement efficiency as that obtained when completely wound was obtained.
[0005]
[Problems to be solved by the invention]
The reinforcement method of winding the reinforcing fiber sheet around the bridge pier in a U-shape is easy to construct, but since the reinforcing fiber sheet is not completely wrapped around the bridge pier cross beam, the reinforcement efficiency of the reinforcing fiber sheet is It becomes as low as about half the reinforcement efficiency when completely wound.
[0006]
That is, when the reinforcing fiber sheet is reinforced by winding it in a U shape, even if the reinforcing fiber sheet is impregnated with a resin and cured, if a force that spreads the U-shaped opening acts, it will be cured. The opening of the reinforcing fiber sheet is open and cracks are likely to occur in the bridge pier transverse beam. For this reason, the shear strength assumed at the time of design cannot be expected, there is a risk of shear failure of the pier cross beam during an earthquake, and the pier cross beam to which the reinforcing fiber sheet cannot be completely wound can be easily and reliably reinforced. It has been desired to develop a reinforcing method that can be used.
[0007]
In view of the above circumstances, the present invention provides a method for reinforcing a bridge pier cross beam that can easily and reliably reinforce a bridge pier cross beam, in which a support, a fallen bridge prevention device, and the like are disposed and a reinforcing fiber sheet cannot be completely wound. The purpose is to provide.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a method for reinforcing a bridge pier horizontal beam in which a bridge pier horizontal beam (2) having a falling bridge prevention device (5) or a support (3) disposed on an upper surface thereof is reinforced by a reinforcing fiber sheet.
It is a section along the longitudinal direction of the bridge pier horizontal beam, where the section for preventing the falling bridge (5) or the bearing (3) and the section for preventing the falling bridge (5) or the bearing (3) are not disposed. Wound the reinforcing fiber sheet (7) in a U shape so as to cover both sides (2b) and the lower surface (2c) of the bridge pier transverse beam over the section ,
The reinforcing fiber sheet (7) is impregnated with resin and adhered to both side surfaces (2b) and the lower surface (2c) ,
In the precast part (11, 16) of the reinforcing band (10, 15) having a precast part (11, 16) impregnated with resin and cured in the center and an uncured part (12, 17) at both ends Apply adhesive (13),
The precast part (11, 11) is adhered to the flat part of the section of the bridge pier horizontal beam where the falling bridge prevention device (5) or the support (3) is not disposed via the adhesive (13). 16)
The reinforcing fiber sheet (7) wound in the U-shape on both side surfaces (2b) and the lower surface (2c) of the bridge pier transverse beam in the section where the falling bridge prevention device (5) or the support (3) is not disposed. Place the uncured part (12, 17) of the reinforcing body (10, 15) so as to wind from above,
The uncured portion (12, 17) is impregnated with resin .
[0009]
The invention according to claim 2 is characterized in that the reinforcing band (10, 15) is formed in a band shape with a reinforcing fiber and longer than the outer peripheral length in the cross section perpendicular to the axis of the bridge pier transverse beam,
The precast part (11, 16) formed in the center part is characterized by being formed in a length shorter than the width of the upper surface of the bridge pier transverse beam.
[0012]
Note that the reference numerals in parentheses are for comparison with the drawings, and are for convenience to facilitate understanding of the invention and do not affect the scope of the claims. Absent.
[0013]
【The invention's effect】
According to the inventions according to claims 1 and 2 , since the reinforcing band is wound and fixed from above the reinforcing fiber sheet wound in a U shape around the bridge pier horizontal beam, the U-shaped reinforcing fiber sheet is formed with the reinforcing band. The spread of the opening can be suppressed, and the shear strength of the bridge pier transverse beam can be greatly improved. In addition, the reinforcing band is easy to install and secures the construction quality because the precast part that has been pre-cured is placed on the bridge pier horizontal beam, wound around the bridge pier horizontal beam, and impregnated with resin. it can.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
1 to 4 show an embodiment of the present invention. FIG. 1 is a side view of a pier lateral beam reinforced by the reinforcing method of the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1, and FIG. 4 is a development view of the reinforcing band in FIG.
[0019]
As shown in FIG. 1, a bridge pier transverse beam 2 is integrally formed at the upper end of a rigid frame pier 1 standing at a predetermined interval. On the upper surface 2a of the bridge pier horizontal beam 2, a support 3 and a falling bridge prevention device 5 and the like are arranged. A bridge superstructure 6 is supported by the support 3, and the falling bridge prevention device 5 prevents the fall. In addition, the space | interval G of the upper surface 2a of the pier horizontal beam 2 and the lower surface 6a of the bridge superstructure 6 is about 30-40 cm normally.
[0020]
As shown in FIG. 2, a flexible reinforcing fiber sheet 7 in which reinforcing fibers are woven in a cloth shape is wound around the outer periphery of the bridge pier horizontal beam 2 so as to cover both side surfaces 2b and the lower surface 2c of the bridge pier horizontal beam 2, It is impregnated and bonded and cured to the pier cross beam 2. The reinforcing fiber sheet 7 is wound so as to cover the upper surface of the pier horizontal beam 2 by a dimension l. Accordingly, when the width of the pier horizontal beam 2 is L1, an opening 8 having a width L2 (L1-2l) around which the reinforcing fiber sheet 7 is not wound is generated on the upper surface 2a of the pier horizontal beam 2.
[0021]
As shown in FIG. 3, the reinforcing fiber sheet having flexibility is impregnated in advance with the upper surface 2a of the bridge pier horizontal beam 2 and the outer periphery of the reinforcing fiber sheet 7 at a position facing the upper surface 2a of the bridge pier horizontal beam 2. The hardened precast part 11 and uncured parts 12 formed at both ends thereof, and the reinforcing band 10 with the adhesive 13 applied to the precast part 11 are left and right in the axial direction in FIG. In the direction, a plurality (four in the case of FIG. 1) are installed at intervals LM (LM1, LM2, LM3).
[0022]
The reinforcing band is an uncured portion 12 (previously impregnated with resin before construction and a portion having flexibility (flexibility) made of a reinforcing fiber sheet, impregnated with resin during construction) 11 is cured so as to overlap the lower surface 2c of the pier cross beam 2, the uncured portion 12 is impregnated with resin, and is bonded and cured to the outer peripheral surface of the reinforcing fiber sheet 7. Yes. At this time, the precast portion 11 is bonded and fixed to the upper surface 2 a of the pier horizontal beam 2 by the adhesive 13.
[0023]
As shown in FIG. 4, the reinforcing band 10 is formed in a band shape having a width W and a length L5, and the precast part 11 at the center is formed in a length L3. As shown in FIG. 1, the width W of the reinforcing band 10 is formed to be smaller than the arrangement interval P of the support 3 and the falling bridge prevention device 5 arranged on the upper surface 2 a of the pier horizontal beam 2. As shown in FIG. 3, the length L5 of the reinforcing band 10 is set such that the reinforcing fiber sheet 7 has a width L4, a height H, and both ends of the reinforcing band 10 in a state where the reinforcing fiber sheet 7 is wound around the bridge pier transverse beam 2. When the overlap amount of L2 is l2, L5 = 2 (L4 + H) + l2. That is, it is formed in a strip shape longer than the outer peripheral length (≈2 (L4 + H)) in the cross section perpendicular to the axis of the pier horizontal beam. In addition, the length l2 which overlaps the both ends of the reinforcement band 10 should just be about 10 cm.

[0024]
The length L3 of the precast portion 11 of the reinforcing band 10 is shorter than the width L1 of the upper surface 2a of the bridge pier horizontal beam 2 shown in FIG. 2, and longer than the width of the opening 8 of the reinforcing fiber sheet 7 (L1 <L3 <L2). ). As shown in FIG. 4, an adhesive application area ARA having a length L6 and a width W2 is formed on at least one surface of the precast portion 11 as an area where an adhesive is to be applied during construction. The application length L6 of the adhesive 13 applied to the adhesive application area ARA at the construction site may be substantially the same length L6≈L2 as the length L2 of the opening 8 of the reinforcing fiber sheet 7 shown in FIG. [0025]
As described above, the reinforcing fiber sheet 7 is wound in a U-shape around the bridge pier horizontal beam 2 on which the support 3 and the falling bridge prevention device 5 are arranged, and the reinforcing fiber sheet 7 is impregnated with resin and bonded to the bridge pier horizontal beam 2; Harden. Next, the reinforcing band 10 on which the precast portion 11 is formed is wound, and the precast portion 11 is bonded to the upper surface 2a of the bridge pier cross beam 2 with an adhesive 13, so that the flexible flexible sheet made of a reinforcing fiber sheet is not impregnated with resin yet. As shown in FIG. 3, the uncured portion 12 having the property is wound around the bridge pier cross beam 2 so as to cover the periphery of the pier cross beam 2, and the uncured portion 12 is impregnated with resin to be bonded and fixed to the reinforcing fiber sheet 7. Furthermore, the winding strength of the reinforcing band 10 can be improved by overlapping both ends 10a and 10a of the reinforcing band 10 below the pier cross beam 2 in FIG. it can.
[0026]
When an external force is applied to the bridge pier cross beam 2 due to an earthquake or the like, the opening 8 of the reinforcing fiber sheet 7 can be prevented from spreading by the reinforcing band 10 which is installed and fixed in a closed ring shape. The shear strength of the bridge pier horizontal beam 2 can be greatly increased as compared with the case where it is reinforced. In this embodiment, when the number of reinforcing bands 10 wound around the pier horizontal beam 2 is n and the width is W, the total extension M in the axial direction of the pier horizontal beam 2 of the reinforcing band 10 wound around the pier horizontal beam 2 is: M = n × W (in the case of FIG. 1, M = 4W). The total extension M around which the reinforcing band 10 is wound is about 1/9 of the length L7 of the shear section of the pier horizontal beam 2 (see FIG. 1, the length between the ramen piers 1 and 1). Can be greatly improved.
[0027]
5 and 6 show a second embodiment of the present invention. FIG. 5 is a sectional view taken along line BB in FIG. 1, and FIG. 6 is a development view of the reinforcing band in FIG.
[0028]
In the figure, the same components as those in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 6, the reinforcing band 15 is composed of a main band 15a and a sub-band 15b, and the main band 15a is formed with a precast portion 16 in which a reinforcing fiber sheet is impregnated and solidified in advance with a resin before construction. Both ends thereof are connected to an uncured portion 17 made of a soft and flexible reinforcing fiber sheet not yet impregnated with resin.
[0029]
Then, as shown in FIG. 5, the adhesive 13 is applied to the precast portion 16 of the main belt 15 a and placed and fixed on the upper surface 2 a of the pier horizontal beam 2, and the uncured portions 17 on both sides are fixed to the side surfaces of the pier horizontal beam 2. The reinforcing fiber sheet 7 wound around 2b is wound around the side surface, impregnated with resin, and adhered to the reinforcing fiber sheet 7.
[0030]
When the adhesion of the main body 15a is completed, the central portion of the sub-band 15b made of a reinforced fiber sheet having soft flexibility is applied to the reinforcing fiber sheet 7 wound around the lower surface 2c of the bridge pier horizontal beam 2 and impregnated with resin. After bonding, the both sides are raised along the side surface 2b of the bridge pier cross beam 2 and overlapped with both

ends

15c and 15c of the main band 15a to impregnate the resin, and the main band 15a and the sub band 15b are joined together. Cured in a closed ring.
[0031]
As shown in FIG. 6, the main band 15a and the sub-band 15b are formed to have a width W and a length L8. As shown in FIG. 5, the length L8 of the main band 15a and the sub-band 15b is such that the width of the reinforcing fiber sheet 7 wound around the bridge pier transverse beam 2 is L4, the height is H, and the length of the overlapping portion is l2. Then, L8 = L4 + H + l2.
[0032]
Even with such a configuration, it is possible to obtain the same effects as those of the above-described embodiment. In addition, the length L8 of the main band 15a and the sub-band 15b can be shortened, the handling of the main band 15a and the sub-band 15b can be facilitated at the time of reinforcement work, and workability can be improved. it can.
[Brief description of the drawings]
FIG. 1 is a side view of a bridge pier transverse beam reinforced by a reinforcing method of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along the line BB in FIG.
4 is a development view of the reinforcing band in FIG. 1. FIG.
FIG. 5 is a cross-sectional view taken along the line BB of FIG. 1, showing another embodiment of the present invention.
6 is a development view of the reinforcing band in FIG. 5;
[Explanation of symbols]
2 ... Bridge pier 2a ... Upper surface 2b ... Side 2c ... Lower surface 3 ... Support 5 ... Fall bridge prevention device 7 ... Reinforcing fiber sheet 10 ... Reinforcement band 11 ... Precast part 12 ... Uncured part 13 ... Adhesive 15 ... Reinforcement band 15a ... Main Band 15b ... Sub-band 16 ... Precast part 17 ... Uncured part

Claims

In the reinforcing method of a bridge pier side beam, which reinforces the bridge pier side beam on which the falling bridge prevention device or the support is arranged on the upper surface by a reinforcing fiber sheet
A section along the longitudinal direction of the bridge pier horizontal beam, the section where the falling bridge prevention device or support is disposed and the section where the bridge prevention device or support is not disposed; Wrap the reinforcing fiber sheet in a U shape so as to cover the lower surface,
Impregnating the reinforcing fiber sheet with resin and adhering to both side surfaces and the lower surface ;
Applying an adhesive to the precast part of the reinforcing band having a precast part impregnated with resin and cured at the center and having an uncured part at both ends,
The precast part is arranged so as to be bonded via the adhesive to a flat part of a section on the upper surface of the bridge pier lateral beam where the falling bridge prevention device or the support is not arranged,
An uncured portion of the reinforcing body is arranged so as to be wound from above the reinforcing fiber sheet wound in the U shape on both side surfaces and the lower surface of the bridge pier transverse beam in a section where the falling bridge prevention device or the support is not arranged. ,
Impregnating the uncured part with resin;
A method of reinforcing a bridge pier cross beam characterized by the above.

The reinforcing band is formed in a band shape with reinforcing fibers, and longer than the outer peripheral length in the cross section perpendicular to the axis of the bridge pier transverse beam,
The precast part formed in the center part is formed in a length shorter than the width of the upper surface of the bridge pier transverse beam,
The method for reinforcing a bridge pier transverse beam according to claim 1.