JP5558742B2 - Girder reinforcement method - Google Patents

Girder reinforcement method Download PDF

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JP5558742B2
JP5558742B2 JP2009132216A JP2009132216A JP5558742B2 JP 5558742 B2 JP5558742 B2 JP 5558742B2 JP 2009132216 A JP2009132216 A JP 2009132216A JP 2009132216 A JP2009132216 A JP 2009132216A JP 5558742 B2 JP5558742 B2 JP 5558742B2
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reinforcing
strain
cable
girder
detecting means
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JP2010275837A (en
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仁 松田
一平 榊
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Kobelco Wire Co Ltd
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Shinko Wire Co Ltd
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    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/14—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable
    • D07B1/145—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising elements for indicating or detecting the rope or cable status
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2301/00—Controls
    • D07B2301/25—System input signals, e.g. set points
    • D07B2301/259—Strain or elongation

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  • Bridges Or Land Bridges (AREA)

Description

本発明は、橋梁の桁等の補強に関する。   The present invention relates to reinforcement of bridge girders and the like.

近年、橋の落下事故が続き、多くの橋で老朽化が問題となっている。また、近い将来、大きな地震の発生が予測されており、既設橋梁の監視および補強の必要性が高まっている。
既設橋梁の健全性の監視については、橋梁の一定区間（例えば渡行始点から終点までの区間）に光ファイバーを敷設して、光ファイバーに入力した光の反射の受光の有無により判別する技術が提案されている（特許文献１）。 In recent years, accidents of falling bridges have continued, and aging has become a problem in many bridges. In addition, major earthquakes are predicted in the near future, and the need to monitor and reinforce existing bridges is increasing.
For monitoring the soundness of existing bridges, a technique has been proposed in which an optical fiber is laid in a certain section of the bridge (for example, the section from the starting point to the end point), and is discriminated based on the presence or absence of reflection of light input to the optical fiber. (Patent Document 1).

特開２００１−３１８０２８号公報JP 2001-318028 A

特許文献１に開示された技術は、橋梁が落下または大きく変形等したのちの使用に耐える状態であるか否かを監視することが可能であるが、使用可能な状態における既設橋梁の健全さの程度を監視することはできず、また既設橋梁を補強するための施策は別途行う必要がある。
本発明は、上述の問題に鑑みてなされたもので、橋梁の桁等における歪みの程度を監視して桁等の補強を適切に行うことが可能な桁の補強方法を提供することを目的とする。 The technique disclosed in Patent Document 1 can monitor whether or not the bridge is in a state that can endure use after being dropped or greatly deformed. However, the soundness of the existing bridge in the usable state can be monitored. The degree cannot be monitored, and measures to reinforce existing bridges must be taken separately.
The present invention has been made in view of the above problems, it aims to provide a monitoring of the degree of distortion in the bridges of digits such as reinforcing how digits that can appropriately perform reinforcement such as digits And

本発明に係る桁の補強方法は、外ケーブル方式による桁の補強方法であって、軸方向のひずみを検出するひずみ検出手段が一体化された補強ケーブルの両端を前記桁の互いに異なる端に連結し、前記補強ケーブルの両端間の導入張力を前記ひずみ検出手段がひずみを検出する直前の強さとし、前記桁の変形が所定の大きさ以上となったときに前記ひずみ検出手段が検出するひずみが所定の大きさになるように前記補強ケーブルの両端間の導入張力を増加させる。
本発明に係る他の桁の補強方法は、外ケーブル方式による桁の補強方法であって、軸方向のひずみを検出するひずみ検出手段が一体化された補強ケーブルの両端を前記桁の互いに異なる端に連結し、前記ひずみ検出手段が検出するひずみが所定の大きさになるように前記補強ケーブルの両端間に張力を導入し、前記ひずみ検出手段が検出するひずみが予め定めた大きさ以上となったときに前記補強ケーブルの両端間の導入張力を増加させる。 A method for reinforcing a girder according to the present invention is a method for reinforcing a girder by an outer cable system, and connects both ends of a reinforcing cable integrated with strain detecting means for detecting axial strain to different ends of the girder. The introduction tension between both ends of the reinforcing cable is the strength immediately before the strain detecting means detects the strain, and the strain detected by the strain detecting means when the deformation of the girder exceeds a predetermined magnitude. The introduction tension between both ends of the reinforcing cable is increased so as to have a predetermined size.
Another method of reinforcing a girder according to the present invention is a method of reinforcing a girder by an outer cable system, wherein both ends of the girder are connected to the ends of a reinforcing cable integrated with strain detecting means for detecting strain in the axial direction. The tension is introduced between both ends of the reinforcing cable so that the strain detected by the strain detecting means becomes a predetermined magnitude, and the strain detected by the strain detecting means becomes a predetermined magnitude or more. The introduction tension between both ends of the reinforcing cable is increased.

また、本発明に係る他の桁の補強方法は、外ケーブル方式による桁の補強方法であって、軸方向のひずみを検出する計測専用ひずみ検出手段が設けられた計測用ケーブルの両端を前記桁の互いに異なる端に連結し、前記計測用ケーブルの両端間の導入張力を前記計測専用ひずみ検出手段がひずみを検出する直前の強さとし、軸方向のひずみを検出する補強ひずみ検出手段が一体化された補強ケーブルの両端を、前記桁の互いに異なる端に前記補強ひずみ検出手段がひずみを検出しない強さで連結し、前記計測専用ひずみ検出手段が検出するひずみが所定の大きさを超えたときに前記補強ひずみ検出手段が検出するひずみが所定の大きさになるように前記補強ケーブルの両端間の導入張力を増加させる。   Another method of reinforcing a girder according to the present invention is a method of reinforcing a girder by an outer cable method, wherein both ends of a measurement cable provided with measurement-specific strain detection means for detecting axial strain are connected to the girder. Reinforcement strain detection means for detecting axial strain is integrated, with the introduction tension between both ends of the measurement cable being the strength immediately before the measurement dedicated strain detection means detects the strain. When both ends of the reinforced cable are connected to different ends of the girder with such a strength that the reinforced strain detecting means does not detect the strain, and the strain detected by the dedicated strain detecting means exceeds a predetermined magnitude The introduction tension between both ends of the reinforcing cable is increased so that the strain detected by the reinforcing strain detecting means becomes a predetermined magnitude.

好ましくは、前記補強ケーブルは、前記桁の両端間に配されたデビエータを介して前記桁に連結される。 Preferably, the reinforcing cable is connected to the girders via a deviator disposed between both ends of the girders .

本発明によると、橋梁の桁等における歪みの程度を監視して桁等の補強を適切に行うことが可能な桁の補強方法を提供することができる。 According to the present invention, it is possible to provide a monitoring of the degree of distortion in the bridges of digits such as reinforcing how digits that can appropriately perform reinforcement such as digits.

図１は補強ケーブルの部分正面図である。FIG. 1 is a partial front view of a reinforcing cable. 図２は図１におけるＡ−Ａ矢視断面図である。2 is a cross-sectional view taken along line AA in FIG. 図３は補強ケーブルにより補強された橋梁の桁の正面図である。FIG. 3 is a front view of a bridge girder reinforced with a reinforcing cable. 図４は図３におけるＢ−Ｂ矢視断面図である。4 is a cross-sectional view taken along arrow BB in FIG. 図５は桁に補強ケーブルが連結される様子を示す図である。FIG. 5 is a diagram illustrating a state in which the reinforcing cable is connected to the beam. 図６は他の補強ケーブルの部分正面図である。FIG. 6 is a partial front view of another reinforcing cable. 図７は図６におけるＣ−Ｃ矢視断面図である。7 is a cross-sectional view taken along the line CC in FIG. 図８は補強にデビエータが使用された橋梁の桁の正面図である。FIG. 8 is a front view of a bridge girder in which a deviator is used for reinforcement. 図９は図８におけるＤ−Ｄ矢視断面図である。9 is a cross-sectional view taken along the line DD in FIG. 図１０はデビエータの正面図である。FIG. 10 is a front view of the deviator. 図１１はデビエータの側面図である。FIG. 11 is a side view of the deviator. 図１２は１対のデビエータが使用された橋梁の桁の正面図である。FIG. 12 is a front view of a bridge girder in which a pair of deviators are used. 図１３は図１２におけるＥ−Ｅ矢視断面図である。13 is a cross-sectional view taken along the line EE in FIG.

図１は補強ケーブル１の部分正面図、図２は図１におけるＡ−Ａ矢視断面図である。
補強ケーブル１は、ケーブル本体３およびひずみゲージ４で構成される。
ケーブル本体３は、図２に示されるように、ＰＣ鋼である素線１１が７本撚られたＰＣ鋼より線である。素線１１は、表面が亜鉛めっきにより被覆され、ケーブル本体３としては樹脂に被覆されず、素線１１，…，１１は外気に露出する。
ひずみゲージ４は、伸縮に応じて抵抗値が変化する金属を用いた箔ひずみゲージである。ひずみゲージ４は、複数の素線１１，…，１１の中の１つの表面に、接着剤１２により固着される。 1 is a partial front view of the reinforcing cable 1, and FIG. 2 is a cross-sectional view taken along the line AA in FIG.
The reinforcing cable 1 includes a cable body 3 and a strain gauge 4.
As shown in FIG. 2, the cable body 3 is a PC steel strand in which seven strands 11 made of PC steel are twisted. The surface of the wire 11 is covered with galvanizing, and the cable body 3 is not covered with resin, and the wires 11,..., 11 are exposed to the outside air.
The strain gauge 4 is a foil strain gauge using a metal whose resistance value changes according to expansion and contraction. The strain gauge 4 is fixed to one surface of the plurality of strands 11,.

補強ケーブル１では、ひずみゲージ４は、ケーブル全長に渡って沿わせるのではなく、ケーブル本体３の一部に取り付けられる。補強ケーブル１は、例えば高価な光ファイバセンサーをケーブル全長に渡って長さ方向に沿わせることによる、初期費用の増大を回避することができる。
図３は補強ケーブル１により補強された橋梁の桁２の正面図、図４は図３におけるＢ−Ｂ矢視断面図、図５は桁２に補強ケーブル１が連結される様子を示す図である。
桁２は、図４に示されるように、断面が略「Ｉ」字状であり、上端及び下端が水平方向両側に張り出す桁上部１３および桁下部１４となっている。桁下部１４には、長手方向にプレストレスが導入されたＰＣ鋼による内ケーブル１５が７箇所に配されている。 In the reinforcing cable 1, the strain gauge 4 is attached to a part of the cable body 3, not along the entire length of the cable. The reinforcing cable 1 can avoid an increase in the initial cost due to, for example, an expensive optical fiber sensor extending along the length of the entire length of the cable.
3 is a front view of the bridge girder 2 reinforced by the reinforcing cable 1, FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3, and FIG. 5 is a diagram showing a state in which the reinforcing cable 1 is connected to the girder 2. is there.
As shown in FIG. 4, the girder 2 has a substantially “I” cross section, and has a girder upper part 13 and a girder lower part 14 whose upper end and lower end project in the horizontal direction. In the lower part of the girder 14, internal cables 15 made of PC steel with prestress introduced in the longitudinal direction are arranged at seven locations.

補強ケーブル１は、その一方の端が桁２の長手方向の一方の端に固定（連結）され、その他方の端が桁２の長手方向の他方の端に張りの程度が調整可能に繋がれている。補強ケーブル１は、外ケーブルとして桁２に取り付けられている。
図５は、長手方向の他方の端における、張りの程度が調整可能な補強ケーブル１の支持の様子を示すものである。補強ケーブル１は、その両端がそれぞれ、定着金具１６，１６、あと施工アンカーボルト１７，１７，１７および定着部材１８により、桁２に連結される。 The reinforcing cable 1 has one end fixed (connected) to one end in the longitudinal direction of the girder 2 and the other end connected to the other end in the longitudinal direction of the girder 2 so that the degree of tension can be adjusted. ing. The reinforcing cable 1 is attached to the beam 2 as an external cable.
FIG. 5 shows how the reinforcing cable 1 is supported at the other end in the longitudinal direction with adjustable tension. Both ends of the reinforcing cable 1 are connected to the beam 2 by fixing brackets 16, 16, post-installed anchor bolts 17, 17, 17 and a fixing member 18.

定着金具１６は、いずれも厚板で形成された底板２１および支圧板２２を有する。底板２１は、桁下部１４の下面２３に、あと施工アンカーボルト１７，１７，１７によって固定される。支圧板２２は、桁２の両端のそれぞれにおいて、底板２１が桁２の一方の端に固定されたときに、垂直になりかつ他方の支圧板２２に対向するように形成されている。また、支圧板２２には貫通孔２４が設けられ、桁２の両側における定着金具１６，１６の貫通孔２４は、その中心が一致している。
張りの程度が調整可能な側の定着部材１８は、本体２５、シムプレート２６およびナット２７からなる。本体２５は、外観が略円柱状であってその軸心で補強ケーブル１の一端に固着されている。本体２５は、その外周に緊張用雄ねじを備える。本体２５は、補強ケーブル１側の端を貫通孔２４に貫通させ、支圧板２２から桁２の端側に突出する部分にシムプレート２６が嵌め入れられて、ナット２７が緊張用雄ねじに螺合される。 The fixing bracket 16 includes a bottom plate 21 and a support plate 22 that are each formed of a thick plate. The bottom plate 21 is fixed to the lower surface 23 of the lower part 14 by post-installed anchor bolts 17, 17, 17. The support plate 22 is formed at each end of the beam 2 so as to be vertical and face the other support plate 22 when the bottom plate 21 is fixed to one end of the beam 2. Further, the support plate 22 is provided with a through hole 24, and the centers of the through holes 24 of the fixing brackets 16, 16 on both sides of the beam 2 coincide.
The fixing member 18 on the side where the degree of tension can be adjusted includes a main body 25, a shim plate 26 and a nut 27. The main body 25 is substantially cylindrical in appearance, and is fixed to one end of the reinforcing cable 1 at its axis. The main body 25 includes a male screw for tension on the outer periphery thereof. In the main body 25, the end of the reinforcing cable 1 is passed through the through hole 24, a shim plate 26 is fitted into a portion protruding from the support plate 22 toward the end of the beam 2, and a nut 27 is screwed into the tension male screw. Is done.

シムプレート２６は、その厚さの違いまたは有無により補強ケーブル１の張力（緊結力）の強弱を調整するためのものである。シムプレート２６およびナット２７は、いずれも貫通孔２４を通過不能であり、補強ケーブル１は、シムプレート２６およびナット２７が支圧板２２に係止されることにより桁２に接続されている。
図６は他の補強ケーブル１Ｂの部分正面図、図７は図６におけるＣ−Ｃ矢視断面図である。
補強ケーブル１Ｂは、ケーブル本体３Ｂおよびひずみゲージ４で構成される。 The shim plate 26 is for adjusting the strength (tightening force) of the reinforcing cable 1 according to the difference in thickness or presence or absence. Neither the shim plate 26 nor the nut 27 can pass through the through hole 24, and the reinforcing cable 1 is connected to the beam 2 by the shim plate 26 and the nut 27 being locked to the bearing plate 22.
6 is a partial front view of another reinforcing cable 1B, and FIG. 7 is a cross-sectional view taken along the line CC in FIG.
The reinforcing cable 1B includes a cable body 3B and a strain gauge 4.

ケーブル本体３Ｂは、鋼線である素線１１Ｂが束ねられ、外側がポリエチレン樹脂２８で被覆されたパラレルワイヤストランドである。
ひずみゲージ４は、伸縮に応じて抵抗値が変化する金属を用いた箔ひずみゲージである。ひずみゲージ４は、補強ケーブル１と同様に、素線１１Ｂ，…，１１Ｂの１つの表面に、接着剤１２により固着されている。
補強ケーブル１Ｂは、図３および図４に示された補強ケーブル１と同様に、プレストレスが導入されたＰＣ鋼による内ケーブル１５が配された桁２に、さらに外ケーブルとして取り付けられる。 The cable body 3 </ b> B is a parallel wire strand in which strands 11 </ b> B that are steel wires are bundled and the outside is covered with a polyethylene resin 28.
The strain gauge 4 is a foil strain gauge using a metal whose resistance value changes according to expansion and contraction. Like the reinforcing cable 1, the strain gauge 4 is fixed to one surface of the strands 11B,.
Similar to the reinforcing cable 1 shown in FIGS. 3 and 4, the reinforcing cable 1 </ b> B is further attached as an outer cable to the beam 2 on which the inner cable 15 made of PC steel introduced with prestress is arranged.

なお、補強ケーブル１Ｂを桁２に取り付ける場合、パラレルワイヤストランドを被覆するポリエチレン樹脂２８における定着金具１６に接続される部分は、さらにオーバーラップ管に覆われ、熱収縮チューブにより養生されて、雨水の浸入等が防止される。
補強ケーブル１，１Ｂは、新設の橋梁および既設の橋梁のいずれの桁２にも外ケーブルとして取り付けることができる。以下に、補強ケーブル１，１Ｂを外ケーブルとして使用した場合の桁の補強について説明する。
新設の橋梁では、内ケーブルはシース（円筒管）内に収容されてまたはそのままで桁に埋め込まれる。 When attaching the reinforcing cable 1B to the girder 2, the portion of the polyethylene resin 28 covering the parallel wire strand that is connected to the fixing bracket 16 is further covered with an overlap tube, cured by a heat shrinkable tube, and rainwater. Intrusion is prevented.
The reinforcing cables 1 and 1B can be attached as external cables to either the newly installed bridge or the existing girder 2 of the existing bridge. The reinforcement of the girder when the reinforcing cables 1 and 1B are used as the outer cables will be described below.
In a new bridge, the inner cable is housed in a sheath (cylindrical tube) or embedded in a girder as it is.

内ケーブルが桁にそのまま埋め込まれる橋梁では、補強用の外ケーブルのほかに、ひずみゲージ付きの計測用細径ケーブルが外ケーブルとして設置される。
さて、新設の橋梁では、新設時において外ケーブルとして桁に取り付けられた補強ケーブル１，１Ｂは、張力が導入されない状態に設定される。橋梁の使用が開始されると、桁のたわみ（桁の老朽化）は、計測用細径ケーブルのひずみゲージにより監視される。
桁２における所定のひずみまたは鉛直変位が観察された段階で、補強用の外ケーブルにＰＳ（プレストレス）が導入される。つまり、桁のたわみが特定の大きさ以上になったとき、一方の側の張りの程度が調整可能な定着金具１６のナット２７を、ひずみゲージ４に検出されるひずみが所定の大きさになるまで締め付ける。このときから、外ケーブルとしての補強ケーブル１，１Ｂは、桁の補強機能を発揮し始める。この後は、補強ケーブル１，１Ｂに取り付けられたひずみゲージ４により、桁のたわみが監視され、橋梁の老朽化の進行がモニターされる。 In a bridge where the inner cable is embedded in the girder as it is, a thin cable for measurement with a strain gauge is installed as the outer cable in addition to the outer cable for reinforcement.
By the way, in the newly installed bridge, the reinforcing cables 1 and 1B attached to the girders as external cables at the time of new installation are set in a state where no tension is introduced. When the use of the bridge is started, the deflection of the girder (aging of the girder) is monitored by a strain gauge on the measuring thin cable.
When a predetermined strain or vertical displacement in the girder 2 is observed, PS (prestress) is introduced into the reinforcing outer cable. In other words, when the deflection of the girder exceeds a specific magnitude, the strain detected by the strain gauge 4 becomes a predetermined magnitude by using the nut 27 of the fixing bracket 16 whose degree of tension on one side can be adjusted. Tighten until From this time, the reinforcing cables 1 and 1B as the outer cables start to exhibit the reinforcing function of the girders. Thereafter, the deflection of the girder is monitored by the strain gauge 4 attached to the reinforcing cables 1 and 1B, and the progress of aging of the bridge is monitored.

なお、新設の橋梁において、当初より外ケーブルにもプレストレスを導入し（ひずみゲージ４が僅かにひずみを検出する程度にナット２７を締め）、桁の強度の向上に寄与させる場合には、ひずみゲージ付きの計測用細径ケーブルの設置は不要である。
既設の橋梁では、観察された桁の変形（たわみ）を参考として、補強ケーブル１，１Ｂを外ケーブルに使用して桁の補強がなされる。補強ケーブル１，１Ｂの桁への導入張力（取り付け時にひずみゲージ４が示すひずみの程度に対応）は、桁の変形の程度を考慮して決定される。例えば、桁の変形の程度が大きい場合には、施工時における補強ケーブル１，１Ｂへの導入張力は大きな値が設定される。 In addition, in a newly built bridge, prestress is also introduced into the outer cable from the beginning (the nut 27 is tightened to such an extent that the strain gauge 4 detects a slight strain) to contribute to the improvement of the strength of the girder. There is no need to install a thin cable for measurement with a gauge.
In the existing bridge, the reinforcement of the girder is made by using the reinforcement cables 1 and 1B as the outer cable with reference to the observed deformation (deflection) of the girder. The tension to be introduced into the girder of the reinforcing cables 1 and 1B (corresponding to the degree of strain indicated by the strain gauge 4 when attached) is determined in consideration of the degree of deformation of the girder. For example, when the degree of deformation of the girder is large, a large value is set for the introduction tension to the reinforcing cables 1 and 1B at the time of construction.

また、既設の橋梁では、施工後に桁の変形によりひずみゲージ４が示すひずみが予め定めた大きさ以上となったときに、補強ケーブル１，１Ｂの両端間の導入張力を人為的に増加させて、補強ケーブル１，１Ｂの補強機能を高めてもよい。
このように、補強ケーブル１，１Ｂは、新設の橋梁および既設の橋梁において、桁２の補強を行うとともに、経年した橋梁の継続使用の可否を監視する手段として機能する。
なお、新設の橋梁においても、計測用細径ケーブルを設けることなく、桁の変形（たわみ）を観察して補強ケーブル１，１Ｂの桁への導入張力を増加させてもよい。 Moreover, in the existing bridge, when the strain indicated by the strain gauge 4 exceeds a predetermined magnitude due to the deformation of the girder after construction, the introduction tension between both ends of the reinforcing cables 1 and 1B is artificially increased. The reinforcing function of the reinforcing cables 1 and 1B may be enhanced.
As described above, the reinforcing cables 1 and 1B function as means for reinforcing the girder 2 in the newly installed bridge and the existing bridge and monitoring whether or not the aged bridge can be used continuously.
Even in a new bridge, the introduction tension to the girders of the reinforcing cables 1 and 1B may be increased by observing the deformation (deflection) of the girders without providing a thin cable for measurement.

図８は補強にデビエータ５が使用された橋梁の桁２の正面図、図９は図８におけるＤ−Ｄ矢視断面図、図１０はデビエータ５の正面図、図１１はデビエータ５の側面図である。
なお、図８（ｂ）は図８（ａ）における一点鎖線で囲まれた部分６を示す。
桁２は、補強ケーブル１による補強にデビエータ（偏向部材）５が使用される。
桁２および補強ケーブル１は、上に説明した桁２および補強ケーブル１と同一のものである。
補強ケーブル１は、両端が桁２のそれぞれ異なる一方に繋がれている。補強ケーブル１の両端の桁２への取り付けは、先に図５を参照して説明した取り付け方法と同じである。 8 is a front view of the bridge girder 2 in which the devitator 5 is used for reinforcement, FIG. 9 is a sectional view taken along the line DD in FIG. 8, FIG. 10 is a front view of the devitater 5, and FIG. It is.
FIG. 8B shows a portion 6 surrounded by a one-dot chain line in FIG.
In the beam 2, a deviator (deflecting member) 5 is used for reinforcement by the reinforcing cable 1.
The spar 2 and the reinforcing cable 1 are the same as the spar 2 and the reinforcing cable 1 described above.
The reinforcing cable 1 is connected at both ends to different ones of the girders 2. The attachment of the reinforcing cable 1 to the girders 2 at both ends is the same as the attachment method described above with reference to FIG.

デビエータ５は、桁２の長手方向の略中央における桁下部１４の下面２３に、あと施工アンカーボルト３１，…，３１によって固定されている。デビエータ５は、その下端近傍に、桁２の長手方向と同じ方向に伸びた溝３２が設けられている。デビエータ５は、溝３２にケーブル本体３の一部を収容し、蓋３３で溝３２の開口を閉じることにより補強ケーブル１を支持する。
図８ないし図１１において、図１ないし図５と同一の構成を有するものについてはこれらにおける符合と同じ符合を付し、その説明を省略する。 The deviator 5 is fixed to the lower surface 23 of the lower part 14 at the approximate center in the longitudinal direction of the beam 2 by post-installed anchor bolts 31,. The deviator 5 is provided with a groove 32 extending in the same direction as the longitudinal direction of the beam 2 in the vicinity of the lower end thereof. The deviator 5 accommodates a part of the cable body 3 in the groove 32 and supports the reinforcing cable 1 by closing the opening of the groove 32 with the lid 33.
8 to 11, those having the same configurations as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.

デビエータ５を使用したときの、補強ケーブル１，１Ｂを外ケーブルとする桁の補強要領は、上に説明したデビエータ５を使用しない場合と同様である。補強ケーブル１，１Ｂは、デビエータ５を使用しない場合と同じく、新設の橋梁および既設の橋梁において、桁２の補強を行うとともに、経年した橋梁の継続使用の可否を監視する手段として機能する。
デビエータ５を使用して補強ケーブル１，１Ｂを取り付けた場合には、デビエータ５ａは、桁２のたわみとともに下方に移動する（図８（ｂ）のデビエータ５ｂ）。そのため、補強ケーブル１，１Ｂのひずみは、デビエータ５を使用しない場合（図８（ｂ）の１ａ）に比べて大きくなり（図８（ｂ）の１ｂ）、桁のたわみ（変形）が同一の場合、より確実に補強ケーブル１，１Ｂのひずみを検出することができる。 When the deviator 5 is used, the reinforcing procedure of the girder using the reinforcing cables 1 and 1B as the outer cable is the same as that when the deviator 5 described above is not used. The reinforcing cables 1 and 1B function as means for reinforcing the girder 2 in the newly installed bridge and the existing bridge as well as not using the deviator 5 and monitoring whether or not the aged bridge can be used continuously.
When the reinforcing cables 1 and 1B are attached using the deviator 5, the deviator 5a moves downward together with the deflection of the beam 2 (the deviator 5b in FIG. 8B). Therefore, the distortion of the reinforcing cables 1 and 1B is larger than that when the deviator 5 is not used (1a in FIG. 8B) (1b in FIG. 8B), and the deflection (deformation) of the girder is the same. In this case, the distortion of the reinforcing cables 1 and 1B can be detected more reliably.

図１２は補強に１対のデビエータ５Ｃ，５Ｃが使用された橋梁の桁２の正面図、図１３は図１２におけるＥ−Ｅ矢視断面図である。
図１２および図１３において、１対のデビエータ５Ｃ，５Ｃは、桁２の長手方向の略中央における桁上部１３の幅方向両側の下面２９，２９に、それぞれあと施工アンカーボルト３１，３１によって固定されている。
桁２、補強ケーブル１およびデビエータ５Ｃ，５Ｃは、図８ないし図１１に示された桁２、補強ケーブル１およびデビエータ５と略同一である。 12 is a front view of a bridge girder 2 in which a pair of deviators 5C and 5C are used for reinforcement, and FIG. 13 is a cross-sectional view taken along line EE in FIG.
12 and 13, the pair of deviators 5C and 5C are fixed to the lower surfaces 29 and 29 on both sides in the width direction of the upper portion 13 of the beam 13 at the approximate center in the longitudinal direction by post-installed anchor bolts 31 and 31, respectively. ing.
The spar 2, the reinforcing cable 1 and the deviators 5C and 5C are substantially the same as the spar 2, the reinforcing cable 1 and the deviator 5 shown in FIGS.

図１２および図１３において、図８ないし図１１と同一の構成を有するものについてはこれらにおける符合と同じ符合を付し、その説明を省略する。
デビエータ５Ｃ，５Ｃを使用したとき、橋梁の桁２に外ケーブルとして使用された補強ケーブル１，１Ｂは、桁２の補強を行うとともに、経年した桁のたわみの程度を監視する手段として機能する。
また、デビエータ５Ｃ，５Ｃは、先に説明したデビエータ５と同様に、桁２のたわみに伴うひずみが大きくなり、より確実におよび精度よく補強ケーブル１，１Ｂのひずみを検出することができる。 12 and 13, components having the same configurations as those in FIGS. 8 to 11 are denoted by the same reference symbols, and description thereof is omitted.
When the deviators 5C and 5C are used, the reinforcing cables 1 and 1B used as outer cables for the bridge girder 2 function as means for reinforcing the girder 2 and monitoring the degree of deflection of the aged girder.
Further, like the deviator 5 described above, the deviators 5C and 5C have a large distortion due to the deflection of the beam 2, and can detect the distortion of the reinforcing cables 1 and 1B more reliably and accurately.

桁２にデビエータ５，５Ｃが設置されていない場合、外ケーブルのひずみは全長に渡り一様に生ずるので、ひずみゲージ４がケーブル本体３，３Ｂに１つ固着されたものを使用すれば、桁２の変形の程度を知ることができる。桁２にデビエータ５，５Ｃが設置された場合には、桁２の設置環境およびデビエータ５，５Ｃと補強ケーブル１，１Ｂとの間の摩擦損失等によりデビエータ５，５Ｃの両側でひずみの程度が異なることがあるため、補強ケーブル１，１Ｂは、ひずみゲージ４がデビエータ５，５Ｃの両側それぞれに固着されたものを使用するのが好ましい。いずれにしても、補強ケーブル１，１Ｂは、その軸方向歪を検出する手段をケーブル本体３の一部のみに設置すれば、ケーブル全長、ひいては構造体全体のモニタリングを経済的に行うことができる。   If the deviators 5 and 5C are not installed in the girder 2, the strain of the outer cable is uniformly generated over the entire length. The degree of deformation of 2 can be known. When the deviators 5 and 5C are installed in the girder 2, the degree of strain on both sides of the deviators 5 and 5C is reduced due to the installation environment of the girder 2 and the friction loss between the deviators 5 and 5C and the reinforcing cables 1 and 1B. Since there is a difference, it is preferable to use the reinforcing cables 1 and 1B in which the strain gauges 4 are fixed to both sides of the deviators 5 and 5C. In any case, if the means for detecting the axial strain of the reinforcing cables 1 and 1B is installed only in a part of the cable main body 3, it is possible to economically monitor the entire length of the cable and thus the entire structure. .

上述の実施形態において、補強ケーブル１，１Ｂの桁２への取り付けを、一端を張りの程度を調整可能とし他端を固定としたが、両端のいずれも張りの程度を調整可能としてもよい。
補強ケーブル１，１Ｂ、および補強ケーブル１，１Ｂの各構成または全体の構造、形状、寸法、個数、材質などは、本発明の趣旨に沿って適宜変更することができる。 In the above-described embodiment, the reinforcement cables 1 and 1B are attached to the beam 2 by adjusting the tension at one end and fixing the other end. However, the tension at both ends may be adjustable.
Each configuration or overall structure, shape, size, number, material, and the like of the reinforcing cables 1 and 1B and the reinforcing cables 1 and 1B can be appropriately changed in accordance with the spirit of the present invention.

本発明は、橋梁の桁等の補強に利用することができる。   The present invention can be used for reinforcing bridge girders and the like.

１，１Ｂ 補強ケーブル
２ （橋梁の）桁
４ ひずみ検出手段、補強ひずみ検出手段（ひずみゲージ）
５，５Ｃ デビエータ
１１，１１Ｂ 素線 1,1B Reinforcement cable 2 (Bridge) girder 4 Strain detection means, reinforcement strain detection means (strain gauge)
5,5C Deviator 11, 11B Wire

Claims (4)

外ケーブル方式による桁の補強方法であって、
軸方向のひずみを検出するひずみ検出手段が一体化された補強ケーブルの両端を前記桁の互いに異なる端に連結し、
前記補強ケーブルの両端間の導入張力を前記ひずみ検出手段がひずみを検出する直前の強さとし、
前記桁の変形が所定の大きさ以上となったときに前記ひずみ検出手段が検出するひずみが所定の大きさになるように前記補強ケーブルの両端間の導入張力を増加させる
ことを特徴とする桁の補強方法。 A method of reinforcing a girder by an outer cable method,
Connecting both ends of a reinforcing cable integrated with strain detecting means for detecting axial strain to different ends of the beam;
The introduction tension between both ends of the reinforcing cable is the strength immediately before the strain detection means detects the strain,
Girder for increasing the introduction tension between both ends of the reinforcing cable so that the strain detected by the strain detecting means becomes a predetermined size when the deformation of the beam becomes a predetermined size or more. Reinforcement method. 外ケーブル方式による桁の補強方法であって、
軸方向のひずみを検出するひずみ検出手段が一体化された補強ケーブルの両端を前記桁の互いに異なる端に連結し、
前記ひずみ検出手段が検出するひずみが所定の大きさになるように前記補強ケーブルの両端間に張力を導入し、
前記ひずみ検出手段が検出するひずみが予め定めた大きさ以上となったときに前記補強ケーブルの両端間の導入張力を増加させる
ことを特徴とする桁の補強方法。 A method of reinforcing a girder by an outer cable method,
Connecting both ends of a reinforcing cable integrated with strain detecting means for detecting axial strain to different ends of the beam;
Introducing tension between both ends of the reinforcing cable so that the strain detected by the strain detection means becomes a predetermined magnitude,
A method for reinforcing a girder, wherein the introduction tension between both ends of the reinforcing cable is increased when the strain detected by the strain detecting means exceeds a predetermined magnitude. 外ケーブル方式による桁の補強方法であって、
軸方向のひずみを検出する計測専用ひずみ検出手段が設けられた計測用ケーブルの両端を前記桁の互いに異なる端に連結し、
前記計測用ケーブルの両端間の導入張力を前記計測専用ひずみ検出手段がひずみを検出する直前の強さとし、
軸方向のひずみを検出する補強ひずみ検出手段が一体化された補強ケーブルの両端を、前記桁の互いに異なる端に前記補強ひずみ検出手段がひずみを検出しない強さで連結し、
前記計測専用ひずみ検出手段が検出するひずみが所定の大きさを超えたときに前記補強ひずみ検出手段が検出するひずみが所定の大きさになるように前記補強ケーブルの両端間の導入張力を増加させる
ことを特徴とする桁の補強方法。 A method of reinforcing a girder by an outer cable method,
Connecting both ends of the measurement cable provided with a measurement strain detecting means for detecting strain in the axial direction to different ends of the beam,
The introduction tension between both ends of the measurement cable is the strength immediately before the measurement strain detecting means detects the strain,
Connecting both ends of a reinforcing cable in which reinforcing strain detecting means for detecting axial strain is integrated, to the different ends of the beam with such strength that the reinforcing strain detecting means does not detect strain;
Increasing the introduction tension between both ends of the reinforcing cable so that the strain detected by the reinforcing strain detecting means becomes a predetermined magnitude when the strain detected by the dedicated strain detecting means exceeds a predetermined magnitude. A method of reinforcing a girder characterized by that. 前記補強ケーブルは、前記桁の両端間に配されたデビエータを介して前記桁に連結される
請求項１ないし請求項３のいずれか１項に記載の桁の補強方法。 The method of reinforcing a girder according to any one of claims 1 to 3, wherein the reinforcing cable is connected to the girder via a deviance arranged between both ends of the girder.
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