JP2008169572A - Bridge with a small number of main girders - Google Patents

Bridge with a small number of main girders Download PDF

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JP2008169572A
JP2008169572A JP2007002092A JP2007002092A JP2008169572A JP 2008169572 A JP2008169572 A JP 2008169572A JP 2007002092 A JP2007002092 A JP 2007002092A JP 2007002092 A JP2007002092 A JP 2007002092A JP 2008169572 A JP2008169572 A JP 2008169572A
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main girder
main
bridge
floor slab
minority
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Koichi Asano
浩一 浅野
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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 durability and manufacturability of a bridge with a small number of main girders, which has the two or three main girders using an RC floor slab. <P>SOLUTION: A stiffener 6 is fixed between upper and lower flanges 1a and 1b of the main girder 1 in such a manner as to be perpendicular to a web 1c, and a web plate 2c of a cross girder 2 is fastened and connected to the stiffener 6 by means of a high-strength bolt 8. <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５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, 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 as shown in FIG. The space between 31 is connected and reinforced with 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。   However, such a minority main girder bridge has the following problems.

（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。 (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６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７及び図８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との間に突き合わせの溶接部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。   In an RC floor slab 2 main girder bridge which is a kind of a minority main girder bridge using this RC floor slab, for example, as shown in FIG. Four sides of the RC floor slab 4 arranged in parallel with the direction are supported. As shown in FIGS. 7 and 8, the butt is placed between the upper flange 1a of the main beam 1 and the upper flange 2a of the horizontal beam 2. Since the welded portion 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.

また、工場で入熱量の多い溶接作業が必要となることから、橋梁の製作性が低下するという問題もあった。
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 addition, there is a problem that the manufacturability of the bridge is lowered because welding work with a large amount of heat input is required in the factory.
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本の主桁を持つ少数主桁橋の疲労耐久性及び製作性を向上することにある。   An object of the present invention is to improve the fatigue durability and manufacturability of a minority main girder bridge having two or three main girders using RC floor slabs.

上記の目的を達成するため、本発明は、一対の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本の主桁と、前記主桁同士を連結する複数の横桁とにより鉄筋コンクリート床版を少なくとも４辺で支持する少数主桁橋において、前記フランジ間に前記ウェブと直角になるようにスティフナーを固定し、前記横桁の腹板を前記スティフナーに締結手段により連結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 provides two or three main girders made of a steel plate or a section steel having a pair of flanges and webs, and a plurality of cross girders connecting the main girders. In the minority main girder bridge that supports the reinforced concrete floor slab with at least four sides, a stiffener is fixed between the flanges so as to be perpendicular to the web, and the abdomen of the cross girder is connected to the stiffener by fastening means. It is a minority main girder bridge.

また、前記ウェブと前記鋼板との両方と直角になるように支持板を固定し、前記横桁の下フランジの両端部を前記支持板に締結手段により連結することが望ましい。   Further, it is preferable that the support plate is fixed so as to be at right angles to both the web and the steel plate, and both end portions of the lower flange of the cross beam are connected to the support plate by fastening means.

この締結手段には、高力ボルトを用いることが好ましい。   It is preferable to use a high-strength bolt for the fastening means.

本発明によれば、ＲＣ床版を用いた２本又は３本の主桁を持つ少数主桁橋において、主桁のフランジ間にウェブと直角になるようにスティフナーを固定し、横桁の腹板をスティフナーに締結手段により連結するようにしたので、主桁の上フランジと横桁の上フランジ間の溶接部をなくすことができると共に、主桁と横桁を溶接によることなく接続できるため、疲労耐久性及び製作性を向上することができる。   According to the present invention, in a minority main girder bridge having two or three main girders using an RC floor slab, a stiffener is fixed between the flanges of the main girder so as to be perpendicular to the web, and Since the plate is connected to the stiffener by fastening means, the weld between the upper flange of the main beam and the upper flange of the main beam can be eliminated, and the main beam and the horizontal beam can be connected without welding. Fatigue durability and manufacturability 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。   Embodiments of the present invention will be described below with reference to the drawings.

図１〜図３は、本発明の実施形態からなる少数主桁橋の一例である。   FIGS. 1-3 is an example of the minority main girder bridge which consists of embodiment of this invention.

この少数主桁橋は、２本の主桁１の上フランジ１ａと、横桁２の上フランジ２ａとにより、ＲＣ床版４を支持するものである。   This minority main girder bridge supports the RC floor slab 4 by the upper flange 1a of the two main girders 1 and the upper flange 2a of the cross beam 2.

それぞれの主桁１内側の上フランジ１ａと下フランジ１ｂの間には、ウェブ１ｃと直角になるように複数の貫通孔を有する板状の垂直補剛材（スティフナー）６が固定されている。また、主桁１における横桁２の下フランジ２ｂ高さに相当する位置には、２枚の支持板７がスティフナー６を挟むようにして下フランジ２ｂと平行に固定されている。   A plate-shaped vertical stiffener (stiffener) 6 having a plurality of through holes is fixed between the upper flange 1a and the lower flange 1b inside each main beam 1 so as to be perpendicular to the web 1c. In addition, at the position corresponding to the height of the lower flange 2 b of the cross beam 2 in the main beam 1, two support plates 7 are fixed in parallel with the lower flange 2 b so as to sandwich the stiffener 6.

横桁２の腹板２ｃの両端部には複数の貫通孔が形成されており、スティフナー６の貫通孔と重ねた状態で高力ボルト８を挿通して締め付けることにより主桁１と接続されている。また、支持板７と下フランジ２ｂとは、添接板９を介して同じく高力ボルト８により接続されている。添接板９は、支持板７と下フランジ２ｂを挟むように２枚配置してもよい。なお、添接板９を用いずに、支持板７と下フランジ２ｂを直接締結してもよい。   A plurality of through holes are formed at both ends of the abdominal plate 2c of the cross beam 2, and are connected to the main beam 1 by inserting and tightening a high-strength bolt 8 in a state of being overlapped with the through hole of the stiffener 6. Yes. Further, the support plate 7 and the lower flange 2 b are similarly connected by a high-strength bolt 8 through an attachment plate 9. The two attachment plates 9 may be arranged so as to sandwich the support plate 7 and the lower flange 2b. The support plate 7 and the lower flange 2b may be directly fastened without using the attachment plate 9.

高力ボルト８には、（社）日本道路協会の「道路橋示方書・同解説」の規定を満足するトルシア形高力ボルトが好ましく用いられる。   As the high-strength bolt 8, a Torcia-type high-strength bolt that satisfies the provisions of the “Road Bridge Specification / Description” of the Japan Road Association is preferably used.

横桁２の上フランジ２ａ及び下フランジ２ｂの両端部は、主桁１の上フランジ１ａ及び支持板７とそれぞれ干渉しないように切り欠く必要があるが、橋梁の強度維持の点からは問題はない。   Both ends of the upper flange 2a and the lower flange 2b of the cross beam 2 need to be cut out so as not to interfere with the upper flange 1a and the support plate 7 of the main beam 1, respectively. Absent.

このように、締結手段である高力ボルトを用いて主桁と横桁を接続することにより、主桁の上フランジと横桁の上フランジとの間の溶接部をなくすことができるため、少数主桁橋の疲労強度を向上することができる。   In this way, by connecting the main girder and the cross beam using a high-strength bolt that is a fastening means, it is possible to eliminate the weld between the upper flange of the main girder and the upper flange of the cross beam. The fatigue strength of the main girder bridge can be improved.

また、あらかじめ工場などにおいて、主桁にスティフナー等を固定しておくことにより、主桁と横桁を接続する溶接作業を不要とすることができるため、少数主桁橋の製作性を向上することができる。   In addition, by fixing a stiffener, etc. to the main girder in advance in a factory, etc., it is possible to eliminate the need for welding work to connect the main girder and the horizontal girder, thus improving the manufacturability of minority main girder bridges Can do.

なお、上記の例においては主桁の本数を２本としているが、例えば図４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 the above example, the number of main digits is two. However, for example, as shown in FIG. 4, 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仕口部の拡大図である。It is an enlarged view of the joint part of the main girder and the horizontal girder in FIG. 図２におけるあＡ−Ａ断面の矢視図である。FIG. 3 is an arrow view of the AA cross section in FIG. 2. 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仕口部の拡大斜視図である。It is an expansion perspective view of the joint part of a main girder and a 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 （主桁の）下フランジ
１ｃ （主桁の）ウェブ
２ 横桁
２ａ （横桁の）上フランジ
２ｂ （横桁の）下フランジ
２ｃ 腹板
３ 主鉄筋
４ ＲＣ床版
５ 溶接部
６ スティフナー
７ 支持板
８ 高力ボルト
９ 添接板 1 Main Girder 1a (Main Girder) Upper Flange 1b (Main Girder) Lower Flange 1c (Main Girder) Web 2 Horizontal Girder 2a (Horizontal Girder) Upper Flange 2b (Horizontal Girder) Lower Flange 2c Belly Plate 3 Main Reinforcing bar 4 RC floor slab 5 Welded part 6 Stiffener 7 Support plate 8 High-strength bolt 9 Joint plate

Claims (3)

一対の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本の主桁と、前記主桁同士を連結する複数の横桁と、により鉄筋コンクリート床版を少なくとも４辺で支持する少数主桁橋において、
前記フランジ間に前記ウェブと直角になるようにスティフナーを固定し、前記横桁の腹板を前記スティフナーに締結手段により連結した少数主桁橋。 A reinforced concrete floor slab is supported on at least four sides by two or three main girders composed of a steel plate or a shape steel having a pair of flanges and webs, and a plurality of cross girders connecting the main girders. In the minority main girder bridge,
A minority main girder bridge in which a stiffener is fixed between the flanges so as to be perpendicular to the web, and the abdomen of the cross beam is connected to the stiffener by fastening means. 前記ウェブと前記鋼板との両方に直角になるように支持板を固定し、前記横桁の下フランジの両端部を前記支持板に締結手段により連結した請求項１に記載の少数主桁橋。   The minority main girder bridge according to claim 1, wherein a support plate is fixed so as to be perpendicular to both the web and the steel plate, and both end portions of the lower flange of the cross beam are connected to the support plate by fastening means. 前記締結手段が、高力ボルトである請求項１又は２に記載の少数主桁橋。   The minority main girder bridge according to claim 1 or 2, wherein the fastening means is a high-strength bolt.
JP2007002092A 2007-01-10 2007-01-10 Bridge with a small number of main girders Pending JP2008169572A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008190256A (en) * 2007-02-06 2008-08-21 Mitsui Eng & Shipbuild Co Ltd Small number main girder bridge
CN104060526A (en) * 2014-06-30 2014-09-24 长安大学 Anti-fatigue structure detail of vertical stiffening rib at web plate gap of steel bridge

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858308A (en) * 1981-10-02 1983-04-06 日本鋼管株式会社 Repairing of bridge beam floor plate by steel floor panel
JPH0718630A (en) * 1993-07-01 1995-01-20 Nippon Steel Corp Bridge
JP2000008325A (en) * 1998-06-29 2000-01-11 Nippon Steel Corp Combined girder structure for floor slab
JP2001220712A (en) * 2000-02-10 2001-08-17 Sho Bond Constr Co Ltd Pre-fabricated steel base plate girder and connecting structure of the same
JP2004225290A (en) * 2003-01-21 2004-08-12 Ishikawajima Harima Heavy Ind Co Ltd Composite floor-slab girder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5858308A (en) * 1981-10-02 1983-04-06 日本鋼管株式会社 Repairing of bridge beam floor plate by steel floor panel
JPH0718630A (en) * 1993-07-01 1995-01-20 Nippon Steel Corp Bridge
JP2000008325A (en) * 1998-06-29 2000-01-11 Nippon Steel Corp Combined girder structure for floor slab
JP2001220712A (en) * 2000-02-10 2001-08-17 Sho Bond Constr Co Ltd Pre-fabricated steel base plate girder and connecting structure of the same
JP2004225290A (en) * 2003-01-21 2004-08-12 Ishikawajima Harima Heavy Ind Co Ltd Composite floor-slab girder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008190256A (en) * 2007-02-06 2008-08-21 Mitsui Eng & Shipbuild Co Ltd Small number main girder bridge
JP4733655B2 (en) * 2007-02-06 2011-07-27 三井造船株式会社 Minority main girder bridge
CN104060526A (en) * 2014-06-30 2014-09-24 长安大学 Anti-fatigue structure detail of vertical stiffening rib at web plate gap of steel bridge

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