JP2008144380A - Bridge using a small number of main girders - Google Patents

Bridge using a small number of main girders Download PDF

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Publication number
JP2008144380A
JP2008144380A JP2006329904A JP2006329904A JP2008144380A JP 2008144380 A JP2008144380 A JP 2008144380A JP 2006329904 A JP2006329904 A JP 2006329904A JP 2006329904 A JP2006329904 A JP 2006329904A JP 2008144380 A JP2008144380 A JP 2008144380A
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main girder
bridge
floor slab
main
minority
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Yasuhiro Suzuki
康宏 鈴木
Takashi Ashida
隆 芦田
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Mitsui Engineering and Shipbuilding Co Ltd
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Mitsui Engineering and Shipbuilding Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To enhance the fatigue resistance of a bridge using a small numbers of main girders, which has the two or three main girders using a reinforced concrete floor slab. <P>SOLUTION: The main girder 1 and the reinforced concrete floor slab 4 are connected together in such a manner that a stud 6 fixed to an undersurface of an upper flange 1a of the main girder 1 is used as an anchor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、主桁が２本又は３本である少数主桁橋に関し、特に鉄筋コンクリート床版を用いた少数主桁橋において、主桁と鉄筋コンクリート床版をアンカー部材で接続することにより疲労耐久性を向上させた少数主桁橋に関する。   The present invention relates to a minority main girder bridge having two or three main girders, and in particular, in a minority main girder bridge using a reinforced concrete floor slab, fatigue resistance is achieved by connecting the main girder and the reinforced concrete floor slab with an anchor member. On minority main girder bridge.

近年では、製作コストや維持管理コストの低減と現場作業の省力化のために、鉄筋コンクリート床版（以下、「ＲＣ床版」という。）を用いた多主桁橋に代わり、プレストレスコンクリート床版（以下、「ＰＣ床版」という。）や合成床版を用いた少数主桁橋が採用されている（非特許文献１を参照）。   In recent years, instead of multi-main girder bridges using reinforced concrete floor slabs (hereinafter referred to as “RC floor slabs”), prestressed concrete slabs have been used to reduce production and maintenance costs and save labor on site. (Hereinafter, referred to as “PC floor slab”) or a minority main girder bridge using a synthetic floor slab is employed (see Non-Patent Document 1).

例えば、少数主桁橋の１種であるＰＣ床版２主桁橋３０は、図４に示すように、プレートガーダからなる鋼製の主桁３１が２本平行に配設され、各主桁３１の間は所定間隔毎に横桁３２で連結補強されており、上部にはＰＣ床版３３が載置されている。ＰＣ床版３３は、ＰＣ鋼材３５及びコンクリート３６から構成され、その上にアスファルト舗装３７が施されている。ＰＣ鋼材３５はシース３８内に挿入され、その両端に螺着させた定着ナット３９によって緊締されている。   For example, as shown in FIG. 4, a PC floor slab 2 main girder bridge 30 which is a kind of a minority main girder bridge has two steel main girders 31 made of plate girders arranged in parallel. The space between 31 is connected and reinforced by a cross beam 32 at predetermined intervals, and a PC floor slab 33 is placed on the upper part. The PC floor slab 33 is composed of a PC steel material 35 and concrete 36, and an asphalt pavement 37 is provided thereon. The PC steel material 35 is inserted into the sheath 38 and fastened by fixing nuts 39 screwed to both ends thereof.

しかし、このような少数主桁橋には、以下のような問題がある。
（１）少数の主桁の採用により橋梁の全体工事費は、従来の多主桁橋に比べて安くなるが、ＰＣ床版はＲＣ床版に比べて高価であるため、支間が１５〜３０ｍ程度の小規模橋梁では、全体工事費に占める床版費用の割合が多くなり、全体工事費のコスト低減効果が発揮され難いこと。 However, such a minority main girder bridge has the following problems.
(1) The adoption of a small number of main girders will reduce the overall construction cost of the bridge compared to conventional multi-main girder bridges, but the PC floor slab is more expensive than the RC floor slab, so the span is 15-30 m. In the case of small-scale bridges, the ratio of floor slab cost to the total construction cost increases, and it is difficult to achieve the cost reduction effect of the total construction cost.

（２）床版の補修や取り替えが必要となった場合には、ＰＣ床版の場合は全面交通止めが、合成床版の場合は増設縦桁などの大規模な構造補強が、それぞれ必要となること。 (2) When floor slabs need to be repaired or replaced, full-scale traffic stoppage is required for PC slabs, and large-scale structural reinforcement such as additional stringers is required for composite slabs. To become a.

（３）ＰＣ床版は、現場施工管理に十分な管理が必要であり、ＲＣ床版の施工に比較して高度な施工技術が必要とされること。 (3) PC floor slabs require sufficient management for on-site construction management, and advanced construction techniques are required compared to RC floor slab construction.

そこで、床版支間を従来の主桁間隔ではなく横桁間隔とすることにより、広幅員であってもＲＣ床版を用いることができる少数主桁橋が提案されている（非特許文献２を参照）。   In view of this, a minority main girder bridge has been proposed in which an RC floor slab can be used even if the width is wide by using a horizontal girder interval instead of a conventional main girder interval (see Non-Patent Document 2). reference).

このＲＣ床版を用いた少数主桁橋の１種であるＲＣ床版２主桁橋では、例えば図５に示すように、一対の主桁１と横桁２によって、主鉄筋３を車輌進行方向と平行に配置したＲＣ床版４を４辺支持しているが、図６及び図７に示すように、主桁１の上フランジ１ａと横桁２の上フランジ２ａとの間に溶接部５が設けられているため、この溶接部５に橋梁の応力が集中して疲労耐久性が低下してしまうという問題があった。
野田清人、「新しい鋼橋の誕生II改訂版」、社団法人日本橋梁建設協会、２００４年１２月、ｐ．４ 石崎 茂、外１名、「２方向支持されたＲＣ床版の劣化機構と耐久性評価法に関する研究」、土木学会論文集、２００３年７月、Ｎｏ．７３８、Ｉ−６４、ｐ．２５７−２７０ In the RC floor slab 2 main girder bridge, which is a kind of a minority main girder bridge using the RC floor slab, the main rebar 3 travels by a pair of main girder 1 and cross girder 2 as shown in FIG. Four sides of the RC floor slab 4 arranged parallel to the direction are supported. As shown in FIGS. 6 and 7, the welded portion is interposed between the upper flange 1a of the main beam 1 and the upper flange 2a of the horizontal beam 2. 5 is provided, there is a problem that the stress of the bridge concentrates on the welded portion 5 and the fatigue durability is lowered.
Kiyoto Noda, “Birth of New Steel Bridge II Revised Edition”, Japan Bridge Construction Association, December 2004, p. 4 Shigeru Ishizaki, 1 other person, “Study on degradation mechanism and durability evaluation method of RC floor slab supported in two directions”, Journal of Japan Society of Civil Engineers, July 2003, No. 738, I-64, p. 257-270

本発明の目的は、ＲＣ床版を用いた２本又は３本の主桁をもつ少数主桁橋の疲労耐久性を向上することにある。   An object of the present invention is to improve the fatigue durability of a minority main girder bridge having two or three main girders using an RC floor slab.

上記の目的を達成するため、本発明は、フランジとウェブとを有する鋼板又は形鋼から構成された２本又は３本の主桁を複数の横桁により連結し、前記横桁により鉄筋コンクリート床版を支持すると共に、前記フランジ下面に垂設したアンカー部材により前記主桁と前記鉄筋コンクリート床版とを接続したことを特徴とする少数主桁橋である。   In order to achieve the above object, the present invention relates to a reinforced concrete floor slab formed by connecting two or three main girders composed of a steel plate or a shape steel having a flange and a web by a plurality of cross girders. The main girder and the reinforced concrete slab are connected to each other by an anchor member suspended on the lower surface of the flange.

このアンカー部材には、スタッドを用いることが好ましい。   The anchor member is preferably a stud.

本発明によれば、ＲＣ床版を用いた２本又は３本の主桁をもつ少数主桁橋において、横桁でＲＣ床版を支持すると共に、主桁のフランジ下面に垂設したアンカー部材により主桁とＲＣ床版を接続するようにしたので、応力が集中する主桁の上フランジに溶接部がなくなるため、疲労耐久性を向上させることができる。   According to the present invention, in a minority main girder bridge having two or three main girders using an RC floor slab, an anchor member that supports the RC floor slab with a horizontal girder and is suspended from the lower surface of the flange of the main girder. Since the main girder and the RC floor slab are connected to each other, the welded portion is eliminated from the upper flange of the main girder where the stress is concentrated, so that the fatigue durability can be improved.

以下に、本発明の実施の形態について、図面を参照して説明する。
図１は、本発明の実施形態からなる少数主桁橋の一例である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an example of a minority main girder bridge according to an embodiment of the present invention.

この少数主桁橋は２本の主桁１を有し、それらの主桁１と横桁２は、主桁１のウェブ１ｂの溶接部５において固定されている。ＲＣ床版４は横桁２の上フランジ２ａの上面で支持されると共に、主桁１の上フランジ１ａの下面に固定された複数のスタッド６をアンカーとして主桁１と接続されている。スタッド６の形状及び寸法は橋梁の設計条件から決定されるが、ＪＩＳ Ｂ １１９８に規定する「頭付きスタッド」を標準とし、例えば呼び名が１９又は２２であって長さが８０〜１５０ｍｍのものが好ましく用いられる。このスタッド６は、ＲＣ床版４のコンクリート打設時に、主桁１の上フランジ１ａととともにＲＣ床版４内に埋め込まれてアンカーとなる。   This minority main girder bridge has two main girder 1, and the main girder 1 and the horizontal girder 2 are fixed at the welded portion 5 of the web 1 b of the main girder 1. The RC floor slab 4 is supported on the upper surface of the upper flange 2a of the cross beam 2 and is connected to the main beam 1 with a plurality of studs 6 fixed to the lower surface of the upper flange 1a of the main beam 1 as anchors. The shape and dimensions of the stud 6 are determined from the design conditions of the bridge, but the “headed stud” defined in JIS B 1198 is standard, for example, the name is 19 or 22 and the length is 80 to 150 mm. Preferably used. The stud 6 is embedded in the RC floor slab 4 together with the upper flange 1a of the main girder 1 when the RC floor slab 4 is placed in concrete to be an anchor.

なお、ＲＣ床版４の水平方向への移動を防ぐために、横桁２の上フランジ２ａの上面にもスタッド８を設けてＲＣ床版４と接続することが望ましい。   In order to prevent the horizontal movement of the RC floor slab 4, it is desirable to provide a stud 8 on the upper surface of the upper flange 2 a of the cross beam 2 to connect to the RC floor slab 4.

このような橋梁構造においては、図２に示すように、上フランジ１ａと異なり応力が集中しないウェブ１ｂに溶接部５が位置するため、疲労耐久性を向上させることができる。   In such a bridge structure, as shown in FIG. 2, the welded portion 5 is located on the web 1b where stress is not concentrated unlike the upper flange 1a, so that fatigue durability can be improved.

また、ＲＣ床版４に対する主桁１の上フランジ１ａの高さ方向の埋設位置を変えることで、少数主桁橋の総桁高を最大でＲＣ床版４の厚さ分だけ調整することができる。そのため、既設橋の架け替えや河川改修において、路面高や主桁下端位置が低く抑えられる場合に容易に対応することができ、施工可能な範囲を拡大することができる。   In addition, the total girder height of the minority main girder bridge can be adjusted by the thickness of the RC floor slab 4 at maximum by changing the burying position of the upper flange 1a of the main girder 1 with respect to the RC floor slab 4. it can. Therefore, it is possible to easily cope with the case where the road surface height and the lower position of the main girder can be kept low in the replacement of the existing bridge and the river repair, and the construction possible range can be expanded.

なお、上記のいずれの例においても主桁の本数を２本としているが、例えば図３に示すように、主桁が３本の場合にも適用できることはもちろんである。   In any of the above examples, the number of main digits is two. However, for example, as shown in FIG. 3, the present invention can be applied to a case where there are three main digits.

本発明の実施形態からなる少数主桁橋である２主桁橋の橋軸方向に垂直な断面図である。It is sectional drawing perpendicular | vertical to the bridge-axis direction of the 2 main girder bridge which is a minority main girder bridge which consists of embodiment of this invention. 図１における主桁と横桁の溶接部付近の拡大図である。FIG. 2 is an enlarged view of the vicinity of a welded portion of a main beam and a horizontal beam in FIG. 1. 本発明の実施形態からなる少数主桁橋である３主桁橋の橋軸方向に垂直な断面図である。It is sectional drawing perpendicular | vertical to the bridge-axis direction of the 3 main girder bridge which is a minority main girder bridge which consists of embodiment of this invention. ＰＣ床版２主桁橋の橋軸方向に垂直な断面図である。It is sectional drawing perpendicular | vertical to the bridge-axis direction of PC floor slab 2 main girder bridge. 従来のＲＣ床版を用いた２主桁橋の一部断面を示す斜視図である。It is a perspective view which shows the partial cross section of the 2 main girder bridge using the conventional RC floor slab. 従来のＲＣ床版を用いた２主桁橋の橋軸方向に垂直な断面図である。It is sectional drawing perpendicular | vertical to the bridge-axis direction of the 2 main girder bridge using the conventional RC floor slab. 図６における主桁と横桁の溶接部付近の拡大図である。It is an enlarged view of the welding part vicinity of the main girder and the horizontal girder in FIG.

符号の説明Explanation of symbols

１ 主桁
１ａ （主桁の）上フランジ
１ｂ ウェブ
２ 横桁
２ａ （横桁の）上フランジ
３ 主鉄筋
４ ＲＣ床版
５ 溶接部
６ スタッド
７ 舗装面
８ 横桁スタッド 1 Main Girder 1a (Main Girder) Upper Flange 1b Web 2 Cross Girder 2a (Horizontal Girder) Upper Flange 3 Main Reinforcement 4 RC Floor Slab 5 Weld 6 Stud 7 Pavement Surface 8 Horizontal Girder Stud

Claims (2)

フランジとウェブとを有する鋼板又は形鋼から構成された２本又は３本の主桁を複数の横桁により連結し、前記横桁により鉄筋コンクリート床版を支持すると共に、前記フランジ下面に垂設したアンカー部材により前記主桁と前記鉄筋コンクリート床版とを接続した少数主桁橋。   Two or three main girders composed of a steel plate or shape steel having a flange and a web are connected by a plurality of cross girders, and a reinforced concrete floor slab is supported by the cross girders, and is suspended from the flange lower surface. A minority main girder bridge in which the main girder and the reinforced concrete slab are connected by an anchor member. 前記アンカー部材がスタッドである請求項１に記載の少数主桁橋。   The minority main girder bridge according to claim 1, wherein the anchor member is a stud.
JP2006329904A 2006-12-06 2006-12-06 Bridge using a small number of main girders Pending JP2008144380A (en)

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Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1042877A (en) * 1950-04-24 1953-11-04 Method for producing a prestressed reinforced concrete beam
JPS5030837Y1 (en) * 1970-04-14 1975-09-09
JPS5243331A (en) * 1975-10-03 1977-04-05 Oki Electric Ind Co Ltd Electric loading coupling element
JPS5469231A (en) * 1977-11-11 1979-06-04 Nippon Kokan Koji Kk Main girder for bridge
JPS59134262A (en) * 1983-01-17 1984-08-01 ハンブロ・ストラクテユアル・システムズ・リミテイド Composite structure of steel and concrete and steel joist
JPS6014019A (en) * 1983-07-05 1985-01-24 Sanyo Electric Co Ltd Cooker
JPS60195206A (en) * 1984-03-14 1985-10-03 川崎製鉄株式会社 Construction of plywood floor panel bridge
JPH06101212A (en) * 1992-09-18 1994-04-12 Ishikawajima Harima Heavy Ind Co Ltd Reinforcing structure for reinforced concrete floor slab
JPH07216826A (en) * 1994-01-28 1995-08-15 Mitsubishi Heavy Ind Ltd Joint structure between floor slab and steel girder in precast concrete floor slab composite girder bridge
JPH08338007A (en) * 1995-06-14 1996-12-24 Mitsubishi Heavy Ind Ltd Stacked h-steel bridge
JPH11166292A (en) * 1997-12-04 1999-06-22 Fujita Corp Steel frame beam and floor execution using the beam
JPH11229329A (en) * 1998-02-10 1999-08-24 Kawasaki Steel Corp Constructing method for steel-concrete composite floor board bridge
JP2002129521A (en) * 2000-10-25 2002-05-09 Nkk Corp Sealing construction for boundary portion between steel and concrete
JP2002188120A (en) * 2000-12-19 2002-07-05 Nippon Steel Corp Joining structure of corrugated steel plate web beam
JP2002188209A (en) * 2000-12-19 2002-07-05 Takenaka Komuten Co Ltd Buried slab type composite beam in steel-framed flange
JP2003119724A (en) * 2001-10-12 2003-04-23 Kawada Construction Co Ltd Method for constructing floor slab of pre-beam composite girder
JP2003221808A (en) * 2002-01-30 2003-08-08 Kawada Industries Inc Corrugated steel-plate web girder
JP2004092094A (en) * 2002-08-30 2004-03-25 Sho Bond Constr Co Ltd Structure of composite floor slab bridge equipped with double main girder
JP2004225290A (en) * 2003-01-21 2004-08-12 Ishikawajima Harima Heavy Ind Co Ltd Composite floor-slab girder
JP2006118191A (en) * 2004-10-21 2006-05-11 Kawatetsu Kyoryo Tekko Kk Construction method of concrete floor slab of composite floor slab bridge, and form structure

Patent Citations (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1042877A (en) * 1950-04-24 1953-11-04 Method for producing a prestressed reinforced concrete beam
JPS5030837Y1 (en) * 1970-04-14 1975-09-09
JPS5243331A (en) * 1975-10-03 1977-04-05 Oki Electric Ind Co Ltd Electric loading coupling element
JPS5469231A (en) * 1977-11-11 1979-06-04 Nippon Kokan Koji Kk Main girder for bridge
JPS59134262A (en) * 1983-01-17 1984-08-01 ハンブロ・ストラクテユアル・システムズ・リミテイド Composite structure of steel and concrete and steel joist
JPS6014019A (en) * 1983-07-05 1985-01-24 Sanyo Electric Co Ltd Cooker
JPS60195206A (en) * 1984-03-14 1985-10-03 川崎製鉄株式会社 Construction of plywood floor panel bridge
JPH06101212A (en) * 1992-09-18 1994-04-12 Ishikawajima Harima Heavy Ind Co Ltd Reinforcing structure for reinforced concrete floor slab
JPH07216826A (en) * 1994-01-28 1995-08-15 Mitsubishi Heavy Ind Ltd Joint structure between floor slab and steel girder in precast concrete floor slab composite girder bridge
JPH08338007A (en) * 1995-06-14 1996-12-24 Mitsubishi Heavy Ind Ltd Stacked h-steel bridge
JPH11166292A (en) * 1997-12-04 1999-06-22 Fujita Corp Steel frame beam and floor execution using the beam
JPH11229329A (en) * 1998-02-10 1999-08-24 Kawasaki Steel Corp Constructing method for steel-concrete composite floor board bridge
JP2002129521A (en) * 2000-10-25 2002-05-09 Nkk Corp Sealing construction for boundary portion between steel and concrete
JP2002188120A (en) * 2000-12-19 2002-07-05 Nippon Steel Corp Joining structure of corrugated steel plate web beam
JP2002188209A (en) * 2000-12-19 2002-07-05 Takenaka Komuten Co Ltd Buried slab type composite beam in steel-framed flange
JP2003119724A (en) * 2001-10-12 2003-04-23 Kawada Construction Co Ltd Method for constructing floor slab of pre-beam composite girder
JP2003221808A (en) * 2002-01-30 2003-08-08 Kawada Industries Inc Corrugated steel-plate web girder
JP2004092094A (en) * 2002-08-30 2004-03-25 Sho Bond Constr Co Ltd Structure of composite floor slab bridge equipped with double main girder
JP2004225290A (en) * 2003-01-21 2004-08-12 Ishikawajima Harima Heavy Ind Co Ltd Composite floor-slab girder
JP2006118191A (en) * 2004-10-21 2006-05-11 Kawatetsu Kyoryo Tekko Kk Construction method of concrete floor slab of composite floor slab bridge, and form structure

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