JP4739072B2 - Girder structure and construction method when multiple simple girder bridges are used as one simple girder bridge - Google Patents

Girder structure and construction method when multiple simple girder bridges are used as one simple girder bridge Download PDF

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JP4739072B2
JP4739072B2 JP2006070740A JP2006070740A JP4739072B2 JP 4739072 B2 JP4739072 B2 JP 4739072B2 JP 2006070740 A JP2006070740 A JP 2006070740A JP 2006070740 A JP2006070740 A JP 2006070740A JP 4739072 B2 JP4739072 B2 JP 4739072B2
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girder
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JP2007247225A (en
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嘉満 森田
俊也 井隼
義顕 中安
明夫 正司
広 松下
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Oriental Shiraishi Corp
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Description

本発明は、例えば小河川等に架設された既設の橋梁を、ＰＣ鋼材（例えば、ケーブル）を用いて補強し補修する、複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造および工法に関する。
The present invention, for example, the existing bridges are bridged small rivers, PC steel (e.g., cable) digits when reinforced repair is used to a plurality of simple digit bridges with one simple digits bridges Concerning structure and construction method.

従来、複数の単純桁からなる複数径間または多径間の既設橋梁における橋脚を耐震補強する場合には、橋脚の周囲に、コンクリートや鋼板、あるいは炭素補強繊維からなる繊維シート（ＣＦＲＰ）等を巻き付けて行う補修工法が採用されている。
特開平９−２８７１１１号公報 Conventionally, when piers of existing bridges with multiple spans or multiple spans consisting of multiple simple girders are seismically reinforced, concrete, steel plates, or fiber sheets (CFRP) made of carbon reinforcing fibers are used around the bridge piers. The repair method that is wound around is used.
JP 9-287111 A

しかしながら、上記した従来の既設橋梁における補修工法では、特に、中・小河川における橋脚をコンクリートや鋼板で巻き付けた場合、河川阻害率を侵すことがある。また、橋脚に繊維シートを巻き付ける場合には、補強自体が困難であるばかりでなく、補修作業自体が、現場周辺の条件により、多大な費用を掛かるという問題があった。   However, in the above-described conventional repair method for existing bridges, particularly when the piers of medium and small rivers are wrapped with concrete or steel plates, the river inhibition rate may be affected. In addition, when a fiber sheet is wound around a bridge pier, not only is the reinforcement itself difficult, but there is a problem that the repair work itself is expensive due to conditions around the site.

本発明は、上記従来の問題点に鑑み、複数径間または多径間の既設単純桁橋梁における中間橋脚の撤去を可能にすると共に前記単純桁よりも長尺の単純桁とすることを可能にし、橋梁の耐震性や耐荷力を高めるとともに、補修費用の削減化を図ることができる複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造および工法を提供することを目的とする。
In view of the above-described conventional problems, the present invention enables the removal of intermediate piers in an existing simple girder bridge having a plurality of spans or multiple spans, and allows a simple girder longer than the simple girder to be removed. , and it aims to provide a girder structure and method when to increase the earthquake resistance and load bearing capacity of the bridge, a plurality of simple digit bridges can be reduced of repair costs and a simple digit bridges To do.

前記の課題を有利に解決するために、第１発明の複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造においては、複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造であって、直列に配置され上面側に貫通孔に連通する案内溝を形成した複数の単純桁の下部および上部に渡って、下部のＰＣ鋼材と前記各貫通孔及び案内溝に渡って上部のＰＣ鋼材をそれぞれ配置すると共に、直列に隣り合う単純桁間に硬化性充填材を充填し、前記各ＰＣ鋼材を緊張・定着しプレストレスを導入し、直列に隣り合う前記単純桁の対向端部の下側または上側のうち、少なくとも下側に跨って、鋼板または形鋼あるいはシート状補強繊維の補強部材を配設して、単純桁の端部に固定し、単純桁間の中間橋脚を撤去して、前記単純桁よりも長尺の単純桁としたことを特徴とする。
また、第２発明では、第１発明の複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造において、硬化性充填材は、直列に隣り合う桁端部間を覆うように設けられた繊維補強コンクリートであることを特徴とする。
第３発明は複数の単純桁の橋梁を一つの単純桁の橋梁とする工法であって、直列に隣り合う単純桁間に硬化性充填材を充填し、かつ直列に配置され上面側に貫通孔に連通する案内溝を形成した複数の単純桁の下部および上部に渡って、下部のＰＣ鋼材と前記各貫通孔及び案内溝に渡って上部のＰＣ鋼材をそれぞれ配置した後、前記各ＰＣ鋼材を緊張・定着しプレストレスを導入し、直列に隣り合う前記単純桁の対向端部の下側または上側のうち、少なくとも下側に跨って、鋼板または形鋼あるいはシート状補強繊維の補強部材を配設して、単純桁の端部に固定し、単純桁間の中間橋脚を撤去して、前記単純桁よりも長尺の単純桁とてしたことを特徴とする。
To advantageously solve the above problems, the girder structure in the case of a plurality of simple digit bridges of the first aspect of the present invention as one of the simple digits bridges, one of the simple order of bridges multiple simple digit bridges And a lower PC steel material and each of the through holes, and a plurality of simple girders arranged in series and having guide grooves communicating with the through holes on the upper surface side. while arranged top of PC steel material over a guiding groove, filled with a curable filler between simple digit adjacent in series, and prestressing tense and fixed to each PC steel, adjacent in series A reinforcing member of a steel plate, a steel plate, or a sheet-like reinforcing fiber is disposed across at least the lower side or the upper side of the opposite end of the simple girder, and is fixed to the end of the simple girder. and removing the intermediate piers between digits long than the simple digits It characterized in that it was a simple digits.
In the second invention, in the girder structure in the case that a plurality of simple digit bridges bright first shot and one of the simple order of bridges, the curable filler material, so as to cover between digits end adjacent to the series It is the fiber reinforced concrete provided in.
The third invention provides a method for a plurality of simple digit bridges with one simple digits bridges, filled with a curable filler between simple digit adjacent in series, and are arranged in series through hole on the upper side across the lower and upper of a plurality of simple digits forming a guide groove communicating with, after placing the upper portion of PC steel respectively over the bottom of the PC steel and the respective through-hole and the guide groove, wherein each PC steel Tensioning and fixing, introducing pre-stress, straddling at least the lower side of the opposing ends of the simple girders adjacent in series across the lower side, a reinforcing member of steel plate or section steel or sheet-like reinforcing fiber It is arranged and fixed to the end of the simple girder, the intermediate pier between the simple girder is removed, and the simple girder is longer than the simple girder .

本発明によれば、単純桁間に硬化性充填材を充填して硬化してプレストレスを導入できる状態とし、各単純桁間の下部および上部に跨って連続的に配置したＰＣ鋼材の両端を桁端部にそれぞれ緊張状態で定着して、各単純桁に渡ってプレストレスを導入し、各中間橋脚を撤去可能にしてなるため、多大な費用を要する橋脚の補強を行う必要がないばかりか、河川阻害率を侵すことがなく、しかも、補修費用の削減化を図ることができるとともに、橋梁の上部構造を単純桁よりも長尺の単純桁とすることができる。
また第１発明のように、中間橋脚が撤去されていると、景観がよくなると共に、河川の有効幅を広げることができる。
また、第１発明のように、単純桁端部に跨るように補強部材が配置されていると、接合部を補強して、接合部のせん断抵抗を高めたり、接合部の剛性を高めることができ、耐震補強することができる。
第２発明によると、直列に隣り合う単純桁端部間を覆う繊維補強コンクリートであるので、簡単な構造で単純桁を結合桁とすることができると共に単純桁相互を結合することができる。
第３発明によると、直列に隣り合う単純桁間に硬化性充填材を充填し、かつ直列に配置された複数の単純桁の下部および上部に渡って、ＰＣ鋼材を配置した後、前記ＰＣ鋼材を緊張・定着しプレストレスを導入して結合桁にするので、簡単に単純桁相互を利用してより長尺の単純桁としての結合桁とすることができる。また、直列に隣り合う単純桁間に硬化性充填材を充填・硬化させてプレストレスを導入できる状態にでき、また、ＰＣ鋼材によりプレストレスを導入して単純桁よりも長尺の単純桁とすることができる。
According to the present invention, a state that can Prestressing cured by filling a curable filling material between simple digits, both ends of the PC steel was continuously disposed across the lower and upper between each simple digit Is fixed at the end of each girder in tension, prestress is introduced over each simple girder, and each intermediate pier can be removed, so there is no need to reinforce the pier that requires a lot of cost In addition, the river blockage rate is not affected, and the repair cost can be reduced, and the upper structure of the bridge can be a simple girder longer than a simple girder .
Moreover, when the intermediate pier is removed as in the first invention, the landscape is improved and the effective width of the river can be expanded.
In addition, when the reinforcing member is disposed so as to straddle the end of the simple girder as in the first aspect of the invention, the joint can be reinforced to increase the shear resistance of the joint or to increase the rigidity of the joint. Can be seismically reinforced.
According to the second invention, since the fiber reinforced concrete covers between the ends of the simple girders adjacent in series, the simple girders can be combined with each other and the simple girders can be coupled with each other with a simple structure.
According to the third invention, after the PC steel material is disposed over the lower and upper portions of the plurality of simple girders arranged in series, the PC steel material is filled between the simple girders adjacent in series. Are combined and prestressed to form a combined girder, so that simple girder can be easily used to form a coupled girder as a longer simple girder . Moreover, it can be in a state where prestress can be introduced by filling and hardening a curable filler between adjacent simple girders in series, and prestressing can be introduced with PC steel to make a simple girder longer than a simple girder. can do.

以下、本発明の一実施形態を、図を参照して説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の複数の単純桁の橋梁における桁を長尺の単純桁とした桁構造の実施形態を示したもので、例えば、中・小河川において、両岸の裏込め土Ａ、Ａが背面に埋め戻しされた左右両橋台１、１間には、橋梁２が架設されている。この橋梁２は、橋軸方向（左右方向）に直列に配置されている左右一対の単純桁３、３を単純桁よりも長尺の単純桁としての結合桁３８とすると共に、後述する既設の橋梁２０における単純桁３を支承する中間橋脚２１を撤去して補修改善したものである。
FIG. 1 shows an embodiment of a girder structure in which a girder in a plurality of simple girder bridges according to the present invention is a long simple girder . A bridge 2 is installed between the left and right abutments 1 and 1 in which A is back-filled. The bridge 2 includes a pair of left and right simple girders 3 and 3 arranged in series in the direction of the bridge axis (left and right direction) as a connecting girder 38 as a simple girder longer than the simple girder , The intermediate pier 21 that supports the simple girder 3 in the bridge 20 is removed and repaired and improved.

この実施形態の橋梁２は、橋軸方向に直列に設置されている各単純桁３、３を結合桁３８とすると共に、その結合桁３８の橋台側端部３ａ、３ａを、各橋台１、１上にゴム支承材４、４を介して支承させることにより設置すると共に、各単純桁３、３間の下部には、左右両橋台１、１間の方向に沿って跨るように前記各単純桁３，３を結合した結合桁３８のほぼ全長に渡って、下部外ケーブル５等のＰＣ鋼材が、単純桁３の下部に渡って、偏向材６を介して連続的に配置されている。
同様に、各単純桁３、３を結合した結合桁３８の上部には、左右両橋台１、１間の方向に沿って跨るように結合桁３８の全長に渡って、上部外ケーブル７が連続的に配置され、これら下部外ケーブル５の両端部５ａ、５ａ及び上部外ケーブル７の両端部７ａ、７ａを、結合桁３８の橋台側端部３ａ、３ａにそれぞれ定着具８、８によって緊張状態で定着し、前記各単純桁３、３間に下部プレストレス及び上部プレストレスを、上下にバランスを持たせて導入し長尺の単純桁とするように架設されている。
In the bridge 2 of this embodiment, the simple girders 3 and 3 installed in series in the direction of the bridge axis are used as the connecting girders 38, and the abutment side ends 3 a and 3 a of the connecting girders 38 are connected to the respective abutments 1 and 3. 1 is installed by being supported through rubber support members 4 and 4, and the lower portions between the simple girders 3 and 3 are arranged so as to straddle along the direction between the left and right abutments 1 and 1. The PC steel material such as the lower outer cable 5 is continuously arranged through the deflecting material 6 over the lower part of the simple girder 3 over almost the entire length of the coupling girder 38 coupled with the girder 3 and 3.
Similarly, the upper outer cable 7 is continuous over the entire length of the coupling girder 38 so as to straddle along the direction between the left and right abutments 1, 1 at the upper part of the coupling girder 38 that couples the simple girder 3, 3. The both ends 5a, 5a of the lower outer cable 5 and the ends 7a, 7a of the upper outer cable 7 are tensioned to the abutment side ends 3a, 3a of the coupling girder 38 by the fixing tools 8, 8, respectively. The lower pre-stress and the upper pre-stress are introduced between the simple girders 3 and 3 with a balance in the vertical direction so as to form a long simple girder .

前記各単純桁３、３の互いに隣接する接続端部３ｂ、３ｂ間の下部には、それらの間を跨ぐように、炭素繊維で補強された繊維シート９が添設され、その繊維シート９は、各単純桁３に接着剤により固着されて、剪断力に対する補強効果を高めている。
また、各単純桁３、３の互いに隣接する接続端部３ｂ、３ｂ間には、図２に示すように、無収縮モルタルからなる充填材１０が充填されている。 A fiber sheet 9 reinforced with carbon fiber is attached to the lower part between the connecting ends 3b and 3b of the simple girders 3 and 3 adjacent to each other, and the fiber sheet 9 is These are fixed to each simple girder 3 with an adhesive to enhance the reinforcing effect against the shearing force.
Further, between the adjacent connecting end portions 3b and 3b of the simple girders 3 and 3, as shown in FIG. 2, a filler 10 made of non-shrink mortar is filled.

前記の繊維シート９に代えて、各単純桁３、３の互いに隣接する接続端部３ｂ、３ｂ間の上下両面に、図２（ａ）、（ｂ）に示す鋼板１１、１１を互いに跨るように配置して、単純桁３の端部に設けたアンカー孔にアンカーボルトを定着するようにして鋼板１１を取り付けるようにした定着具１３としたり、単純桁３の端部の厚み方向の貫通孔にねじ付きＰＣ鋼材を挿通配置してナットにより固定するようにした定着具１３としてもよく、図２（ｃ）に示すように、単純桁３の上面側に渡って鋼板１１を配置すると共に、下面側に渡ってアングル材１２を配置して、ボルトまたはアンカーボルトからなる定着具１３によりそれぞれ固定するか、あるいは、図２（ｄ）に示すように、一方の単純桁３の接続端部３ｂに凸部１４を突出させ、他方の単純桁３の端部との間に、鉄筋コンクリートまたは繊維補強コンクリート１５を打設することより、剪断力に対する補強効果を高めるようにしてもよい。
なお、前記図２（ｄ）の場合には、単純桁３の端部には、適宜、粗面またはずれ止め材が設けられて、繊維補強コンクリート等のコンクリートとの接合が容易にされている。 Instead of the fiber sheet 9 described above, the steel plates 11 and 11 shown in FIGS. 2A and 2B are straddled on both upper and lower surfaces between the connecting end portions 3b and 3b of the simple girders 3 and 3 which are adjacent to each other. Or a fixing tool 13 in which the steel plate 11 is attached so as to fix the anchor bolt to the anchor hole provided at the end of the simple girder 3 or the through-hole in the thickness direction of the end of the simple girder 3 It is good also as the fixing tool 13 which inserted and arrange | positioned the PC steel material with a screw | thread, and was fixed with a nut, as shown in FIG.2 (c), while arrange | positioning the steel plate 11 over the upper surface side of the simple girder 3, The angle member 12 is arranged over the lower surface side and fixed by a fixing tool 13 made of a bolt or an anchor bolt, or, as shown in FIG. 2 (d), the connecting end 3b of one simple girder 3 The convex part 14 is projected to Between the end of a simple digit 3, than to pouring the concrete or fiber reinforced concrete 15, may be enhanced reinforcing effect for the shear force.
In the case of FIG. 2 (d), the end of the simple girder 3 is appropriately provided with a rough surface or an anti-displacement material to facilitate joining with concrete such as fiber reinforced concrete. .

前記各単純桁３、３間の橋台側最端部３ａ、３ａと橋台１、１との間には、背面座コンクリートからなる硬化性充填材１６、１６が充填され、これら硬化性充填材１６、１６により、単純桁３相互を結合して長尺の単純桁としての結合桁３８とされて橋梁２の耐震性を高めている。
Between the abutment side end portions 3a, 3a between the simple girders 3, 3, and the abutments 1, 1, curable fillers 16 and 16 made of back seat concrete are filled, and these curable fillers 16 are filled. 16, the simple girders 3 are coupled to each other to form a long coupled girder 38 as a simple girder , thereby improving the earthquake resistance of the bridge 2.

また、橋軸直角方向に単純桁３が並列配置される場合には、各単純桁３には、横締め用横孔が設けられ、前記各単純桁３、３内には、橋軸直角方向に複数本の横締めケーブル１７が、両橋台１、１間と直交する方向に挿入されており、これら各々の横締めケーブル１７の両端部は、各単純桁３、３の外側面で、緊張状態で定着することにより、橋梁２の耐荷力を高められる。   Further, when the simple girders 3 are arranged in parallel in the direction perpendicular to the bridge axis, each simple girder 3 is provided with a horizontal hole for lateral fastening, and in each simple girder 3, 3, the direction perpendicular to the bridge axis A plurality of lateral fastening cables 17 are inserted in a direction orthogonal to the distance between the two abutments 1, 1, and both ends of each lateral fastening cable 17 are tensioned on the outer surface of each simple girder 3, 3. By fixing in the state, the load bearing capacity of the bridge 2 can be increased.

なお、前記各単純桁３、３間の上面には、直接または床版（図示せず）を介してアスファルト舗装１８が施されている。   An asphalt pavement 18 is provided on the upper surface between the simple girders 3 and 3 directly or via a floor slab (not shown).

次に、本実施形態における複数の単純桁の橋梁を長尺の単純桁とてしての結合桁にする工法を、図３〜図９に基づいて説明する。
Next, a method to bind digit multiple simple digits bridges in this embodiment to the simple digits long, will be described with reference to FIGS. 3 to 9.

図３は、単純桁３を橋軸方向に複数（図示の場合は２つ）設けた形態の既設の橋梁２０を示すもので、互いに隣接する左右一対の単純桁３、３の接続端部３ｂ、３ｂ間は、中間橋脚２１で支承されているとともに、各単純桁３、３の下面と中間橋脚２１の上面との間には、ゴム支承材２２が介在設置されている。   FIG. 3 shows an existing bridge 20 in which a plurality of simple girders 3 are provided in the direction of the bridge axis (two in the illustrated case), and a connecting end 3b of a pair of left and right simple girders 3 and 3 adjacent to each other. 3b is supported by an intermediate pier 21 and a rubber support member 22 is interposed between the lower surface of each of the simple girders 3 and 3 and the upper surface of the intermediate pier 21.

そして、前記既設の橋梁２０を補修する場合には、各単純桁３の橋台１側近傍に、上下方向に貫通する一つまたは複数の縦貫通孔２３と、必要に応じ、各単純桁３の側面に、両橋台１、１間と直交する方向に貫通する複数の横締めケーブル用貫通孔２４を削孔するとともに、各単純桁３、３の互いに隣接する接続端部３ｂ、３ｂ間に、モルタル等の硬化性充填材用間隙２５が確保されるように、桁端部を適宜、切断またははつる。さらに、舗装カッター（図示せず）により、橋梁２０上面のアスファルト舗装２６を切断して撤去し、各単純桁３における橋台側最端部３ａの背面側のパラペット部２７を撤去するとともに、各橋台１の背面側を掘削して、図４に示すように、ジャッキ設置用空間２８を形成する。   When repairing the existing bridge 20, one or a plurality of vertical through holes 23 penetrating vertically in the vicinity of the abutment 1 side of each simple girder 3 and, if necessary, each simple girder 3 In the side surface, a plurality of lateral fastening cable through holes 24 penetrating in a direction perpendicular to the space between both abutments 1 and 1 are drilled, and between the connection ends 3b and 3b of the simple girders 3 and 3 adjacent to each other, The end of the spar is appropriately cut or hooked so as to ensure a gap 25 for a curable filler such as mortar. Further, the asphalt pavement 26 on the upper surface of the bridge 20 is cut and removed by a pavement cutter (not shown), and the parapet portion 27 on the rear side of the abutment side end 3a in each simple girder 3 is removed, and each abutment 1 is excavated to form a jack installation space 28 as shown in FIG.

前記各ジャッキ設置用空間２８、２８には、一台または複数台の油圧式等のジャッキ２９、２９が設置され、これらのジャッキ２９、２９上には、各単純桁３、３の上面に、縦貫通孔２３、２３に挿入される固定用ねじ付きＰＣ鋼材３０、３０およびナットにて固定された横フレーム３１、３１の延出部３１ａ、３１ａが載置され、前記各ジャッキ２９、２９を伸長することにより、横フレーム３１を介して、単純桁３の橋台側端部をジャッキアップすることで、各単純桁３、３を橋台１から浮上させることにより、各単純桁３、３と各橋台１、１との間に介在設置されている既設のゴム支承材３２、３２を、図１に示すような支承容量の大きな新設のゴム支承材４、４に変更可能にしている。
支承容量の大きい新設のゴム支承４、４とする場合に、版桁等では、既設のゴム支承材３２に並列して新たに設置して支承容量を大きくしてもよく、新たに支承容量の大きい新設のゴム支承に取替えてもよい。 In each of the jack installation spaces 28, 28, one or a plurality of hydraulic jacks 29, 29 are installed. On these jacks 29, 29, on the upper surfaces of the simple girders 3, 3, PC steel members 30 and 30 with fixing screws to be inserted into the vertical through holes 23 and 23 and extending portions 31a and 31a of the horizontal frames 31 and 31 fixed with nuts are placed. By extending the abutment side end of the simple girder 3 via the horizontal frame 31 by extending, each simple girder 3, 3 is levitated from the abutment 1, so that each simple girder 3, 3 and each The existing rubber bearing members 32 and 32 interposed between the abutments 1 and 1 can be changed to new rubber bearing members 4 and 4 having a large bearing capacity as shown in FIG.
In the case of the new rubber bearings 4 and 4 having a large bearing capacity, the plate girder or the like may be newly installed in parallel with the existing rubber bearing material 32 to increase the bearing capacity. It may be replaced with a large new rubber bearing.

図示の形態では、各ジャッキ２９、２９による単純桁３の片端部のジャッキアップで、新規なゴム支承材４、４に取替え後、各ジャッキ２９，２９を短縮して、各単純桁３、３をジャッキダウンさせて新規なゴム支承材４に支承させるようにして元の位置に復帰させ、図５に示すように、ナットおよび固定用ねじ付きＰＣ鋼材３０を取外して、横フレーム３１を撤去すると共に、各ジャッキ２９、２９を撤去する。   In the form shown in the figure, the jacks 29, 29 are shortened after the jacks 29, 29 are replaced with new rubber bearing members 4, 4 by jacking up one end of the simple girders 3 with the jacks 29, 29. Is lowered to the original position so as to be supported by the new rubber bearing material 4, and the nut and the PC steel material 30 with the fixing screws are removed, and the horizontal frame 31 is removed as shown in FIG. At the same time, the jacks 29 and 29 are removed.

その後、各単純桁３、３における橋台１側の下部に、橋軸方向端部に向って上向きに緩傾斜で傾斜する下部ケーブル用貫通孔３３、３３を削孔し、また、各単純桁３、３の橋台１側上部に、端部に向って下向きに緩傾斜で傾斜する上部ケーブル用貫通孔３４、３４を削孔する。各単純桁３、３の上面には、図６に示すように、上部ケーブル用貫通孔３４、３４に連通するように、上部ケーブル用案内溝３５、３５が形成され、一方、橋脚２１の上面とゴム支承材２２の下面との間等の橋脚２１上端部には、橋軸方向に延長する下部ケーブル用貫通孔３６が削孔される。   Thereafter, the lower cable through holes 33 and 33 are formed in the lower portions of the simple girders 3 and 3 on the abutment 1 side so as to incline with a gentle inclination upward toward the end in the bridge axis direction. The upper cable through-holes 34 and 34 are formed in the upper part of the 3 abutment 1 side so as to incline downward toward the end with a gentle inclination. As shown in FIG. 6, upper cable guide grooves 35, 35 are formed on the upper surfaces of the simple girders 3, 3 so as to communicate with the upper cable through holes 34, 34. A lower cable through hole 36 extending in the direction of the bridge axis is drilled in the upper end portion of the pier 21 such as between the rubber support member 22 and the lower surface of the rubber support member 22.

まず、互いに隣接する各単純桁３、３の接続端部３ｂ、３ｂ間のモルタル充填用間隙２５に、無収縮モルタルからなる硬化性充填材１０を充填し、硬化させる。また、横締めが必要な場合には、各単純桁３、３の側面における各横締めケーブル用貫通孔２４に、横締めケーブル１７を両橋台１、１間と直交する方向に挿入して、緊張状態で定着する（図７参照）。   First, the mortar filling gap 25 between the connecting ends 3b and 3b of the simple girders 3 and 3 adjacent to each other is filled with the curable filler 10 made of non-shrink mortar and cured. When lateral fastening is required, the lateral fastening cable 17 is inserted into each lateral fastening cable through-hole 24 on the side surface of each simple girder 3, 3 in a direction orthogonal to the distance between the two abutments 1, 1. Fixes in tension (see FIG. 7).

この状態で、各単純桁３、３の下部に、下部ケーブル５を、下部ケーブル用貫通孔３３、３３及び３６に通して連続的に配置するとともに、偏向部位に偏向材６を介在させる（図７参照）。図７にケーブルの定着状態を示すと共に図８に拡大して示すように、下部ケーブル５の端部５ａを定着具８により緊張状態で定着し、各単純桁３、３間に主に下部に渡って下に凸に配置された外ケーブル５により、プレストレスを導入して桁の長尺化を図る。
In this state, the lower cable 5 is continuously disposed under the simple girders 3 and 3 through the lower cable through holes 33, 33 and 36, and the deflecting member 6 is interposed in the deflection portion (see FIG. 7). 7 shows the fixing state of the cable and, as shown in an enlarged view in FIG. 8, the end portion 5a of the lower cable 5 is fixed in a tension state by the fixing tool 8, and is mainly placed between the simple girders 3 and 3 at the lower portion. Prestress is introduced and the length of the girder is increased by the outer cable 5 arranged so as to protrude downward.

次いで、各単純桁３、３間の上部に渡って、上部ケーブル７を、上部ケーブル用貫通孔３４、３４及び案内溝３５を通して連続的に配置するとともに、図８に示すように、上部ケーブル７の端部７ａを定着具８により緊張状態で定着し、各単純桁３、３間の上部プレストレスを、下部プレストレスとバランスを取らせて導入して、安定した桁の長尺化を図る。
Next, the upper cable 7 is continuously arranged through the upper cable through holes 34 and 34 and the guide groove 35 over the upper part between the simple girders 3 and 3, and as shown in FIG. The end 7a is fixed in a tensioned state by the fixing tool 8, and the upper prestress between the simple girders 3 and 3 is introduced in a balanced manner with the lower prestress so as to increase the length of the stable girder. .

このような外ケーブルの定着後、図９に示すように、橋梁２０における単純桁３の端部を支承する中間橋脚２１を撤去し、各単純桁３における橋台側最端部３ａの背面側のパラペット部２７に、定着保護コンクリート３７を打設し、各橋台１の背面側におけるジャッキ設置用空間２８にコンクリートからなる硬化性充填材１６を打設するとともに、再度、アスファルト舗装１８を施すようにし、また、結合桁３８における前記各単純桁３、３の互いに隣接する接続端部３ｂ、３ｂ間の下部には、それらの間を跨ぐように、炭素繊維で補強されたメッシュ状の補強繊維シート９が添設されて適宜接着剤により固着され、剪断力に対する補強効果を高めている。図１に示すような橋梁２の長尺化されて更新された補強／補修が行なわれる。なお、前記のアスファルト舗装１８を行う前に、結合桁３８における前記各単純桁３、３の互いに隣接する接続端部３ｂ、３ｂ間の上部に、それらの間を跨ぐように、炭素繊維で補強されたメッシュ状の補強繊維シート９を添設すると共に、適宜接着剤により単純桁３部分に固着して補強するようにしてもよい。
After fixing such an outer cable, as shown in FIG. 9, the intermediate pier 21 that supports the end portion of the simple girder 3 in the bridge 20 is removed, and the rear side of the abutment side end portion 3 a in each simple girder 3 is removed. The fixing protective concrete 37 is placed on the parapet 27, the curable filler 16 made of concrete is placed in the jack installation space 28 on the back side of each abutment 1, and the asphalt pavement 18 is again applied. In addition, a mesh-like reinforcing fiber sheet reinforced with carbon fibers so as to straddle between the connecting ends 3b and 3b of the simple girders 3 and 3 adjacent to each other in the coupling girder 38. 9 is attached and appropriately fixed by an adhesive to enhance the reinforcing effect against the shearing force. As shown in FIG. 1, the bridge 2 is lengthened and renewed for reinforcement / repair. Before performing the asphalt pavement 18, the coupling beam 38 is reinforced with carbon fiber so as to straddle the upper portions of the connecting beams 3 and 3 between the adjacent connection ends 3 b and 3 b. The mesh-shaped reinforcing fiber sheet 9 may be attached and may be reinforced by adhering to the simple girder 3 portion with an appropriate adhesive.

前記実施形態によれば、各単純桁間の下部に跨って連続的に配置した外ケーブルの両端を、各単純桁間の橋台側の端部にそれぞれ緊張状態で定着して、各単純桁間の少なくとも下部にプレストレスを導入し、各中間橋脚を撤去可能にしてなるため、多大な費用を要する橋脚の補強を行う必要がないばかりか、河川阻害率を侵すことがなく、しかも、補修費用の削減化を図ることができるとともに、複数の単純桁を長尺の単純桁とすることができる。
According to the embodiment, both ends of the outer cable continuously arranged across the lower part between the simple girders are fixed in a tension state at the ends of the abutment side between the simple girders. Introducing pre-stress at least at the bottom of the bridge and making it possible to remove each intermediate pier, so there is no need to reinforce the pier that requires a great amount of money, and it does not violate the river obstruction rate, and repair costs Can be reduced, and a plurality of simple girders can be made into long simple girders .

また、各単純桁の互いに隣接する結合端部間に、無収縮モルタルなどの硬化性充填材を充填し、かつ、互いに跨る補強部材を設けているため、剪断力に対する補強効果を高めることができるとともに、各単純桁の橋台側の端部と橋台との間に、コンクリート等の硬化性充填材を充填しているため、結合桁３８が橋軸方向にずれ移動するのを防止して、橋梁の耐震性を高めることができ、単純桁橋梁の長尺の単純桁化と相俟って、各単純桁間の上部に、後工程で敷設される床版やアスファルト舗装面のひび割れを確実に防止することができる。 In addition, since the reinforcing members straddling each other are filled with curable fillers such as non-shrink mortar between the adjacent joint ends of each simple girder, the reinforcing effect against the shearing force can be enhanced. At the same time, since a curable filler such as concrete is filled between the end of each simple girder on the abutment side and the abutment, the connecting girder 38 is prevented from being displaced in the direction of the bridge axis. In combination with the simple girder of long girder bridges, it is possible to ensure cracking of floor slabs and asphalt pavement surfaces to be laid in the subsequent process at the top of each simple girder. Can be prevented.

さらに、各単純桁内に、両橋台間と直交する方向に挿入して緊張状態で定着可能な横締めプレストレス鋼材を配設しているため、橋梁の耐荷力を高めることができる。   Furthermore, since the transverse fastening prestressed steel material that can be fixed in a tension state by being inserted in a direction orthogonal to the distance between both abutments is disposed in each simple girder, the load bearing capacity of the bridge can be increased.

なお、本実施形態においては、左右一対の単純桁３、３により構成し、各単純桁３、３の２径間を中間橋脚２１にて支承される既設の橋梁２０を例にして説明したが、３径間以上の桁橋にも適用できる。   Although the present embodiment has been described by taking an example of an existing bridge 20 configured by a pair of left and right simple girders 3 and 3 and supported by an intermediate bridge pier 21 between two diameters of each of the simple girders 3 and 3. It can also be applied to girder bridges with more than 3 spans.

なお、本発明を実施する場合、図示を省略するが、鉄筋コンクリート製床版（版桁）からなる単純桁を結合桁とする場合にも適用するようにしてもよく、この場合に、床版の巾方向両側縁部の張出し床版部をはつって、床版鉄筋を露出させて連結鉄筋とし、その外側に新たに下路主桁を並設して、前記床版側の連結鉄筋と下路主桁側の連結用張り出し鉄筋とを重ねて、これらの鉄筋を埋め込むように連結部コンクリートを充填するようにしてもよい。なお、前記下路主桁の橋軸方向の両端部は下部構造物に支持され、下路主桁上にアーチ構造等が構築される。
In the case of carrying out the present invention, although not shown, the present invention may be applied to a case where a simple girder composed of a reinforced concrete floor slab (plate girder) is used as a combined girder. By connecting the overhanging floor slabs on both side edges in the width direction, the floor slab reinforcement is exposed to form a connecting rebar, and a lower main girder is newly arranged in parallel to the outside, and the floor slab side connecting rebar is It is also possible to overlap the overhanging reinforcing bars on the road main beam side and fill the connecting portion concrete so as to embed these reinforcing bars. Note that both ends of the lower main girder in the bridge axis direction are supported by a lower structure, and an arch structure or the like is constructed on the lower main girder.

本発明に係る橋梁の補修構造の一実施形態を示す既設橋梁の補修後の断面図である。It is sectional drawing after the repair of the existing bridge which shows one Embodiment of the bridge repair structure which concerns on this invention. 互いに隣接する単純桁間の補強状態を示す図１の中央部における要部拡大断面図である。It is a principal part expanded sectional view in the center part of FIG. 1 which shows the reinforcement state between the mutually adjacent simple girders. 橋梁の補修工程を示し、既設橋梁の補修前の断面図である。It is sectional drawing before the repair process of the existing bridge which shows the repair process of a bridge. 同じくジャッキアップによる支承部材の取替え状態を示す断面図である。It is sectional drawing which similarly shows the replacement state of the support member by jackup. 同じく単純桁及び橋脚へのケーブル貫通孔及び案内溝の加工状態を示す断面図である。It is sectional drawing which similarly shows the processing state of the cable through-hole and guide groove to a simple girder and a bridge pier. 図５のＡ−Ａ線に沿う拡大断面図である。It is an expanded sectional view which follows the AA line of FIG. 同じくケーブルの定着状態を示す断面図である。It is sectional drawing which similarly shows the fixing state of a cable. 図７の定着部における拡大断面図である。FIG. 8 is an enlarged cross-sectional view of the fixing unit in FIG. 7. 同じく橋脚の撤去状態を示す断面図である。It is sectional drawing which similarly shows the removal state of a pier.

符号の説明Explanation of symbols

Ａ 裏込め土
１ 橋台
２ 橋梁
３ 単純桁
３ａ 橋台側最端部
３ｂ 接続端部
４ ゴム支承材
５ 下部ケーブル
５ａ 端部
６ 偏向材
７ 上部ケーブル
７ａ 端部
８ 定着具
９ 繊維シート
１０ 充填材
１１ 鋼板
１２ アングル材
１３ 締着具
１４ 突部
１５ 繊維補強コンクリート
１６ 硬化性充填材
１７ 横締めケーブル
１８ アスファルト舗装
２０ 既設橋梁
２１ 橋脚
２２ ゴム支承材
２３ 縦貫通孔
２４ 横締めケーブル用貫通孔
２５ モルタル充填用間隙
２６ アスファルト舗装
２７ パラペット部
２８ ジャッキ設置用空間
２９ ジャッキ
３０ 固定用ＰＣ鋼材
３１ 縦フレーム
３１ａ 延出部
３２ ゴム支承材
３３ 下部ケーブル用貫通孔
３４ 上部ケーブル用貫通孔
３５ 上部ケーブル用案内溝
３６ 下部ケーブル用貫通孔
３７ 定着保護コンクリート
３８ 結合桁
A Backfill soil 1 Abutment 2 Bridge 3 Simple girder 3a Abutment side end 3b Connection end 4 Rubber bearing material 5 Lower cable 5a End 6 Deflection material 7 Upper cable 7a End 8 Fixing tool 9 Fiber sheet 10 Filling material 11 Steel plate 12 Angle member 13 Fastener 14 Protrusion 15 Fiber reinforced concrete 16 Hardening filler 17 Lateral fastening cable 18 Asphalt pavement 20 Existing bridge 21 Bridge pier 22 Rubber bearing member 23 Vertical through hole 24 Lateral fastening cable through hole 25 Mortar filling Gap 26 Asphalt pavement 27 Parapet part 28 Jack installation space 29 Jack 30 Fixing PC steel 31 Vertical frame 31a Extension part 32 Rubber bearing member 33 Lower cable through hole 34 Upper cable through hole 35 Upper cable guide groove 36 through hole 37 fixing the protective concrete 38 binds digits for the lower cables

Claims (3)

複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造であって、直列に配置され上面側に貫通孔に連通する案内溝を形成した複数の単純桁の下部および上部に渡って、下部のＰＣ鋼材と前記各貫通孔及び案内溝に渡って上部のＰＣ鋼材をそれぞれ配置すると共に、直列に隣り合う単純桁間に硬化性充填材を充填し、前記各ＰＣ鋼材を緊張・定着しプレストレスを導入し、直列に隣り合う前記単純桁の対向端部の下側または上側のうち、少なくとも下側に跨って、鋼板または形鋼あるいはシート状補強繊維の補強部材を配設して、単純桁の端部に固定し、単純桁間の中間橋脚を撤去して、前記単純桁よりも長尺の単純桁としたことを特徴とする複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造。 A girder structure in the case of a plurality of simple digit bridges with one simple digits bridges, the lower and upper plurality of simple digits forming a guide groove communicating with the through hole on the upper surface are arranged in series over and, together with the respectively placed top of PC steel material over the bottom of the PC steel and the respective through-hole and the guide groove, filled with a curable filler between simple digit adjacent in series, tension the respective PC steel・ Fix and introduce pre-stress, and arrange a reinforcing member of steel plate or section steel or sheet-like reinforcing fiber across at least the lower side or the upper side of the opposite ends of the simple girder adjacent in series to, and fixed to the end of a simple digit by removing the intermediate piers between simple digits, the simple digit simply one more simple digit bridges, characterized in that it has a simple digits long than Girder structure for girder bridges . 硬化性充填材は、直列に隣り合う桁端部間を覆うように設けられた繊維補強コンクリートであることを特徴とする請求項１に記載の複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の桁構造。 The curable filler is a fiber-reinforced concrete provided so as to cover between the ends of adjacent girders in series. The bridge of a plurality of simple girders according to claim 1 The digit structure when. 複数の単純桁の橋梁を一つの単純桁の橋梁とする場合の工法であって、直列に隣り合う単純桁間に硬化性充填材を充填し、かつ直列に配置され上面側に貫通孔に連通する案内溝を形成した複数の単純桁の下部および上部に渡って、下部のＰＣ鋼材と前記各貫通孔及び案内溝に渡って上部のＰＣ鋼材をそれぞれ配置した後、前記各ＰＣ鋼材を緊張・定着しプレストレスを導入し、直列に隣り合う前記単純桁の対向端部の下側または上側のうち、少なくとも下側に跨って、鋼板または形鋼あるいはシート状補強繊維の補強部材を配設して、単純桁の端部に固定し、単純桁間の中間橋脚を撤去して、前記単純桁よりも長尺の単純桁としたことを特徴とする複数の単純桁の橋梁を一つの単純桁の橋梁とする工法。 A method in the case of a plurality of simple digit bridges with one simple digits bridges, filled with a curable filler between simple digit adjacent in series, and communicating with the through holes arranged in series top side guided across the lower and upper of a plurality of simple digits forming a groove which, after the PC steel top and arranged over the lower portion of the PC steel and the respective through-hole and the guide groove, tensioning the respective PC steel・ Fix and introduce pre-stress, and arrange a reinforcing member of steel plate or section steel or sheet-like reinforcing fiber across at least the lower side or the upper side of the opposite ends of the simple girder adjacent in series to, and fixed to the end of a simple digit by removing the intermediate piers between simple digits, the simple digit simply one more simple digit bridges, characterized in that it has a simple digits long than Construction method using girder bridges .
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