JP2008274636A - Construction method for truss bridge - Google Patents

Construction method for truss bridge Download PDF

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JP2008274636A
JP2008274636A JP2007119155A JP2007119155A JP2008274636A JP 2008274636 A JP2008274636 A JP 2008274636A JP 2007119155 A JP2007119155 A JP 2007119155A JP 2007119155 A JP2007119155 A JP 2007119155A JP 2008274636 A JP2008274636 A JP 2008274636A
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precast concrete
lower chord
truss bridge
concrete segment
chord material
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Naohiko Kawamura
直彦 河村
Takashi Kaneko
隆 金子
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PS Mitsubishi Construction Co Ltd
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PS Mitsubishi Construction Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rational construction method for a truss bridge, reducing the term of construction for a concrete truss bridge. <P>SOLUTION: A precast concrete segment 11 of an upper chord material on which a metal connector 12 connected to a single item diagonal member 31 is projected, a precast concrete segment 21 of a lower chord material on which a metal connector 22 connected to the single item diagonal member 31 is projected, and the single item diagonal member 31 having connecting end parts to the metal connectors 12, 22 at both ends thereof are respectively individually manufactured in advance, and at a construction place, the precast concrete segment 11 of the upper chord member, the precast concrete segment 21 of the lower chord member, and the single item diagonal member 31 are connected to one another. The precast concrete segment 11 of the upper chord member and the precast concrete segment 21 of the lower chord member are connected to the adjacent already constructed upper and lower chord members 10, 20, respectively by PC stretch material to construct the truss bridge. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、トラス橋の架設方法に関する。   The present invention relates to a method for constructing a truss bridge.

トラスは上弦材と下弦材とを多数の斜材で連結した構造体であって、建築物や構造物の梁又は桁など、あるいは橋梁などに多用されている。上弦材と下弦材は平行なものが多いが、一方が弓形に湾曲したものもある。橋梁では左右平行な２連のトラスの上に上床版を載置してその上を荷重面としたものや、平行な２連のトラスを側壁として下床版を荷重面として用いるものがある。トラスを構成する構造材としては鋼製、コンクリート製又はこれらを複合した複合構造などがある。   A truss is a structure in which an upper chord member and a lower chord member are connected by a large number of diagonal members, and is often used in buildings, beams or girders of structures, bridges, and the like. The upper chord material and the lower chord material are often parallel, but one has a bowed shape. There are bridges in which an upper floor slab is placed on two parallel trusses that are parallel to the left and right, and the upper surface is used as a load surface, and another one that uses a parallel two trusses as side walls and a lower floor slab as a load surface. Examples of the structural material constituting the truss include steel, concrete, and a composite structure in which these are combined.

例えば、トラス斜材に鋼管を用い、斜材下端の格点を下部コンクリート構造の下弦材内に埋設し、斜材上端の格点をコンクリート製の上弦材内に埋設し、支保工上にて施工したコンクリート床版の幅方向両端部にトラス斜材を設置し、下弦材と上弦材のコンクリートを単位長さ分だけ順次繰返し打設して断面略Ｕ字状のポニー橋を構築する技術がある（例えば特許文献１参照。）。   For example, steel pipes are used for the truss diagonal, and the lower end of the diagonal is embedded in the lower chord material of the lower concrete structure, and the upper end of the diagonal is embedded in the upper upper chord material made of concrete. A technology to construct a pony bridge with a substantially U-shaped cross-section by installing truss diagonals on both ends of the concrete floor slab that has been constructed, and repeatedly placing the lower chord material and upper chord material concrete by a unit length sequentially. Yes (see, for example, Patent Document 1).

この技術は、上，下弦材を現場打ちコンクリートで施工し、順次延長する技術である。   In this technology, upper and lower chord materials are constructed with cast-in-place concrete and then extended sequentially.

また、主桁の側部が鋼管から成る箱型コンクリート複合トラス橋を架設作業車を用いて張出し施工する技術がある（例えば特許文献２参照。）。   In addition, there is a technique for overhanging a box-type concrete composite truss bridge whose main girder is made of steel pipe using a construction work vehicle (see, for example, Patent Document 2).

この技術も上床版及び下床版コンクリートを現場打ちで施工し、箱型のコンクリート複合トラス橋を順次延長して架設する技術である。   This technology is also a technology in which upper floor slab concrete and lower floor slab concrete are constructed on-site, and box-type concrete composite truss bridges are sequentially extended and installed.

これらのトラス橋は、上、下弦材（又は上、下床版）を現場打ちコンクリートで施工するので、施工に長期間を要する問題がある。   Since these truss bridges are constructed with cast concrete on the upper and lower chord materials (or upper and lower floor slabs), there is a problem that requires a long time for construction.

また、主桁のウエブに連結鋼管を用いた矩尺の全断面箱型プレキャストセグメントを製造し、このセグメントを順次連結して橋梁を施工する技術も知られている（例えば非特許文献１参照。）。   Also known is a technique of manufacturing a rectangular full-section box-type precast segment using a connecting steel pipe on the main girder web and constructing a bridge by sequentially connecting the segments (see, for example, Non-Patent Document 1). ).

この技術はトラス橋ではなく、ウエブを鋼管によって形成した箱型の鋼コンクリート複合橋である。この技術は箱型橋全断面が一体のセグメントをプレキャストで製作するので、セグメントの部材寸法が大きく、輸送が困難であった。
特開２００３−１９３４２４号公報（第３−５頁、図１） 特開２００３−１９３４３０号公報（第２−５頁、図１） ｈｔｔｐ：／／ｅｎ．ｓｔｒｕｃｔｕｒａｅ．ｄｅ／ｐｈｏｔｏｓ／ｉｎｄｅｘ．ｃｆｍ？ＪＳ＝４５４２ フランス ブロネ高架橋（Ｖｉａｄｕｃｓ ｄｕ Ｂｏｕｌｏｎｎａｉｓ） This technology is not a truss bridge but a box-type steel-concrete composite bridge in which the web is formed of steel pipes. In this technique, a segment in which the entire cross section of the box-type bridge is integrated is manufactured by precast, so that the segment member size is large and transportation is difficult.
JP 2003-193424 A (page 3-5, FIG. 1) Japanese Patent Laying-Open No. 2003-193430 (page 2-5, FIG. 1) http: // en. structure. de / photos / index. cfm? JS = 4542 France Bronnet Viaduct (Viaducs du Boulonnais)

本発明は、コンクリートトラス橋の施工工期を短縮した合理的なトラス橋の架設方法を提供することを目的とするものである。   An object of the present invention is to provide a rational truss bridge construction method that shortens the construction period of a concrete truss bridge.

上記目的を達成する本発明のトラス橋の架設方法は、斜材と連結する連結金具を突設したプレキャストコンクリートセグメントから成る上弦材および下弦材と、両端に前記連結金具との連結端部を備えた斜材とをそれぞれ予め個別に製作し、架設場所にて前記上下弦材と斜材とを連結すると共に上弦材及び下弦材を隣接する既設上下弦材にそれぞれＰＣ緊張材で連結してトラス橋を架設することを特徴とする。   The truss bridge erection method of the present invention that achieves the above object comprises an upper chord member and a lower chord member made of a precast concrete segment projecting a connecting fitting for connecting to an oblique member, and connecting ends of the connecting fitting at both ends. The upper and lower chord members and the diagonal member are connected to each other in advance, and the upper chord member and the lower chord member are connected to the adjacent existing upper and lower chord members with PC tension members, respectively. It is characterized by erection of a bridge.

本発明のトラス橋の架設方法は、上弦材及び下弦材を可搬寸法のプレキャストコンクリートセグメントとし、上弦材及び下弦材には斜材との連結金具を突設しておき、斜材を連結しながら、順次セグメントを連結して施工する。斜材は全体又は両端を金属製とし、連結金具との結合方式、結合強度等は斜材にかかる軸力に応じて定めるとよい。例えばフランジ結合、溶接結合、ピン結合等によって行う。斜材をプレキャストコンクリート製としたときは、その両端部に金属製の連結部を取り付けておけばよいが、場合によっては、上下弦材の連結金具を突出鉄筋とし、これに斜材の両端部の突出鉄筋を連結し、連結部分に型枠を組み立て、コンクリートを打設することによって、連結金具と斜材とを連結してもよい。   In the construction method of the truss bridge of the present invention, the upper chord material and the lower chord material are made of precast concrete segments having a portable size, and the upper chord material and the lower chord material are provided with connecting members with diagonal materials so as to connect the diagonal materials. However, the segments will be connected in sequence. It is preferable that the diagonal material is made entirely of metal or both ends, and the coupling method, the coupling strength, and the like with the coupling metal are determined according to the axial force applied to the diagonal material. For example, it is performed by flange connection, welding connection, pin connection or the like. If the diagonal material is made of precast concrete, it is only necessary to attach metal connection parts to both ends of the diagonal material. The connecting bracket and the diagonal member may be connected by connecting the protruding reinforcing bars, assembling the formwork at the connecting portion, and placing concrete.

上弦材及び下弦材はプレキャストコンクリートセグメントとし、隣接する既設の上弦材及び下弦材にそれぞれＰＣ緊張材で連結する。   The upper chord material and the lower chord material are precast concrete segments, and are connected to adjacent existing upper chord material and lower chord material by PC tension materials, respectively.

上記本発明のトラス橋の架設方法では、前記上弦材がトラス橋の上床版と一体のものとしてもよく、また前記下弦材がトラス橋の下床版と一体であってもよい。さらに、例えば箱形橋ではこれらの上弦材及び下弦材が両方共上床版及び下床版とそれぞれ一体であってもよい。このような好ましい形態では、それぞれのトラス橋の条件に応じて、さらに施工が簡略化され、工期短縮に寄与することとなる。   In the truss bridge erection method of the present invention, the upper chord material may be integrated with the upper floor slab of the truss bridge, and the lower chord material may be integrated with the lower floor slab of the truss bridge. Further, for example, in a box bridge, both the upper chord material and the lower chord material may be integrated with the upper floor slab and the lower floor slab, respectively. In such a preferable form, construction is further simplified according to the conditions of each truss bridge, which contributes to shortening the construction period.

本発明によれば、トラス橋の上弦材、下弦材、斜材を運搬可能な寸法の部材として予め製作し、これらを架設場所にて組立てながら架設するので、現場打ちコンクリートによって上、下弦材を施工する従来の工法に比し、施工工期を著しく短縮することができる。上、下弦材は品質管理の行き届いた工場で製作することができ、すぐれた製品を得ることができる。また、上、下弦材と斜材との連結は、フランジ結合、溶接結合、ピン結合等とし、短時間で合理的に施工することができる。上、下弦材と斜材の格点は、上、下弦材及び連結金具の構造、寸法等を適切に設計することができ、プレキャスト上、下弦材中に埋設するので、すぐれた構造となる。   According to the present invention, the upper chord material, the lower chord material, and the diagonal material of the truss bridge are manufactured in advance as members of a size that can be transported, and these are assembled while being assembled at the installation location. Compared with the conventional method of construction, the construction period can be significantly shortened. The upper and lower chords can be produced in a factory with good quality control, and excellent products can be obtained. Further, the upper and lower chord members and the diagonal member can be connected by flange connection, weld connection, pin connection, etc., and can be reasonably constructed in a short time. The upper and lower chord members and the diagonal members can be appropriately designed in terms of the structure, dimensions, etc. of the upper and lower chord members and the connecting metal fittings, and since they are embedded in the lower chord member on the precast, an excellent structure is obtained.

以下図面を参照して本発明の実施の形態を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１〜３は、本発明のトラス橋の架設方法についての一実施形態を示すもので、トラスの模式的側面図である。   FIGS. 1-3 show one Embodiment about the construction method of the truss bridge of this invention, and are typical side views of a truss.

トラス１は上弦材１０、下弦材２０、及び上弦材１０と下弦材２０とを連結する斜材３０とから構成されている。コンクリートトラス橋では従来、上弦材１０（又は上床版）及び下弦材２０（又は下床版）は現場打ちコンクリートで施工されていた。   The truss 1 includes an upper chord member 10, a lower chord member 20, and an oblique member 30 that connects the upper chord member 10 and the lower chord member 20. Conventionally, in the concrete truss bridge, the upper chord material 10 (or the upper floor slab) and the lower chord material 20 (or the lower floor slab) have been constructed with on-site cast concrete.

本発明では、上弦材１０、下弦材２０はそれぞれ予め個別にプレキャストコンクリート
セグメントとして製造し、斜材３０は予め個別に単品の斜材として製造し、トラス橋の架設場所にて組立て施工する。 In the present invention, the upper chord member 10 and the lower chord member 20 are individually manufactured as precast concrete segments in advance, and the diagonal member 30 is individually manufactured as an individual diagonal member in advance and assembled at the construction site of the truss bridge.

図１に示すように、上弦材のプレキャストコンクリートセグメント１１には、単品の斜材３１と連結する連結金具１２を予め突設してある。連結金具１２は尾端を上弦材のプレキャストコンクリートセグメント１１内の鉄筋と構造的に連結し適切な格点構造を形成してあり、突出端は単品の斜材３１の端部と連結する構造としてある。例えばフランジ結合、突合溶接接合、スリーブや板金を介した溶接構造、ピン結合などとする。   As shown in FIG. 1, a connecting metal fitting 12 that is connected to a single diagonal member 31 is projected in advance on a precast concrete segment 11 made of an upper chord material. The connecting metal fitting 12 is structurally connected to the rebar in the precast concrete segment 11 of the upper chord material at the tail end to form an appropriate grading structure, and the protruding end is connected to the end of the single diagonal member 31. is there. For example, a flange connection, a butt welding connection, a welded structure via a sleeve or a sheet metal, a pin connection, and the like.

下弦材のプレキャストコンクリートセグメント２１にも、単品の斜材３１と連結する連結金具２２を予め突設してある。連結金具２２は尾端を下弦材のプレキャストコンクリートセグメント２１内の鉄筋と構造的に連結し適切な格点構造を形成してあり、突出端は単品の斜材３１の端部と連結する構造としてある。例えばフランジ結合、突合溶接接合、スリーブや板金を介した溶接構造、ピン結合などとする。   The precast concrete segment 21 that is the lower chord material is also provided with a projection 22 in advance that is connected to a single diagonal member 31. The connecting metal fitting 22 is structurally connected to the reinforcing bar in the lower chord material precast concrete segment 21 to form an appropriate grading structure, and the protruding end is connected to the end of the single diagonal member 31. is there. For example, a flange connection, a butt welding connection, a welded structure via a sleeve or a sheet metal, a pin connection, and the like.

単品の斜材３１は、鋼製、例えば鋼管、形鋼などでもよく、場合によりプレキャストコンクリート製でもよい。端部には金属製の連結部３２を備え、上弦材のプレキャストコンクリートセグメント１１の連結金具１２、下弦材のプレキャストコンクリートセグメント２１の連結金具２２と容易に連結することができる構造としておく。例えば、単品の斜材３１をプレキャストコンクリート製としたときは、両端部に金属製の連結部３２を取り付けておく。   The single diagonal member 31 may be made of steel, for example, a steel pipe, a shaped steel, or the like, and may be made of precast concrete in some cases. The end portion is provided with a metal connecting portion 32 so that it can be easily connected to the connecting fitting 12 of the precast concrete segment 11 made of the upper chord material and the connecting fitting 22 of the precast concrete segment 21 made of the lower chord material. For example, when the single diagonal member 31 is made of precast concrete, metal connection portions 32 are attached to both ends.

図１に示すように、上弦材のプレキャストコンクリートセグメント１１を矢印１３で示すように移動してその端面１４を既施工済みの上弦材１０に当接させ、ＰＣ緊張材を上弦材のプレキャストコンクリートセグメント１１内に挿通して既施工済みの上弦材１０と結合し、これを緊張して上弦材のプレキャストコンクリートセグメント１１を既施工済みの上弦材１０と一体化させる。下弦材のプレキャストコンクリートセグメント２１も同様に矢印２３方向に移動して既施工済みの下弦材２０と連結する。   As shown in FIG. 1, the upper chord material precast concrete segment 11 is moved as indicated by an arrow 13 so that its end face 14 is brought into contact with the already-prepared upper chord material 10, and the PC tension material is used as the upper chord material precast concrete segment. 11 is inserted into the upper chord material 10 which has already been constructed, and is tensioned to integrate the precast concrete segment 11 of the upper chord material with the already constructed upper chord material 10. Similarly, the precast concrete segment 21 of the lower chord material moves in the direction of the arrow 23 and is connected to the already-constructed lower chord material 20.

次に図２に示すように、単品の斜材３１を矢印３３で示すように連結金具１２と連結金具２２との間に挿入し、その両端部を連結金具１２と連結金具２２に連結する。   Next, as shown in FIG. 2, a single diagonal member 31 is inserted between the connection fitting 12 and the connection fitting 22 as indicated by an arrow 33, and both ends thereof are connected to the connection fitting 12 and the connection fitting 22.

図３は、上弦材のプレキャストコンクリートセグメント１１、下弦材のプレキャストコンクリートセグメント２１、および単品の斜材３１の連結が完了して、トラス１の延長が完了した状態を示したものである。上弦材のプレキャストコンクリートセグメント１１と単品の斜材３１との連結部１５、下弦材のプレキャストコンクリートセグメント２１と単品の斜材３１との結合部２５は、フランジ結合、溶接接合、ピン結合などによって強固に結合される。   FIG. 3 shows a state where the extension of the truss 1 is completed after the connection of the precast concrete segment 11 of the upper chord material, the precast concrete segment 21 of the lower chord material, and the single diagonal member 31 is completed. The connecting portion 15 between the upper chord material precast concrete segment 11 and the single diagonal member 31 and the connecting portion 25 between the lower chord material precast concrete segment 21 and the single diagonal member 31 are firmly connected by flange connection, welding connection, pin connection or the like. Combined with

以上のように、本発明によれば、上弦材、下弦材のコンクリート現場打ちを必要とせず、プレキャストコンクリートセグメントを用いて、短期間に品質、性能のすぐれたトラス橋を施工することができる。   As described above, according to the present invention, it is possible to construct a truss bridge with excellent quality and performance in a short period of time by using precast concrete segments without requiring concrete casting of upper chord material and lower chord material.

図４〜図６は、本発明の適用されるコンクリートトラス橋の横断面を例示したものである。   4 to 6 illustrate a cross section of a concrete truss bridge to which the present invention is applied.

図４に示すように、上弦材１０と上床版４０とが一体のプレキャストコンクリートセグメントで形成されていてもよく、また図５に示すように下弦材２０と下床版５０とが一体のプレキャストコンクリートセグメントで形成されていてもよい。また図６に示すように、上弦材１０と上床版４０、及び下弦材２０と下床版５０とが、双方共それぞれ一体のプ
レキャストコンクリートセグメントで形成されていてもよい。 As shown in FIG. 4, the upper chord material 10 and the upper floor slab 40 may be formed of an integral precast concrete segment, and as shown in FIG. 5, the lower chord material 20 and the lower floor slab 50 are integral with the precast concrete. It may be formed of segments. As shown in FIG. 6, the upper chord member 10 and the upper floor slab 40, and the lower chord member 20 and the lower floor slab 50 may be formed of a single precast concrete segment.

トラスの模式的側面図である。It is a typical side view of a truss. トラスの模式的側面図である。It is a typical side view of a truss. トラスの模式的側面図である。It is a typical side view of a truss. 本発明の適用されるコンクリートトラス橋の横断面を例示したものである。1 illustrates a cross section of a concrete truss bridge to which the present invention is applied. 本発明の適用されるコンクリートトラス橋の横断面を例示したものである。1 illustrates a cross section of a concrete truss bridge to which the present invention is applied. 本発明の適用されるコンクリートトラス橋の横断面を例示したものである。1 illustrates a cross section of a concrete truss bridge to which the present invention is applied.

符号の説明Explanation of symbols

１ トラス
１０ 上弦材
１１ 上弦材のプレキャストコンクリートセグメント
１２ 連結金具
１３，２３，３３ 矢印
１４ 端面
１５ 連結部
２０ 下弦材
２１ 下弦材のプレキャストコンクリートセグメント
２２ 連結金具
２５ 結合部
３０ 斜材
３１ 単品の斜材
３２ 連結部
４０ 上床版
５０ 下床版 DESCRIPTION OF SYMBOLS 1 Truss 10 Upper chord material 11 Precast concrete segment of upper chord material 12 Connection metal fitting 13,23,33 Arrow 14 End surface 15 Connection part 20 Lower chord material 21 Precast concrete segment of lower chord material 22 Connection metal fitting 25 Connection part 30 Diagonal material 31 Single diagonal material 32 Connecting part 40 Upper floor slab 50 Lower floor slab

Claims (3)

斜材と連結する連結金具を突設したプレキャストコンクリートセグメントから成る上弦材および下弦材と、両端に前記連結金具との連結端部を備えた斜材とをそれぞれ予め個別に製作し、架設場所にて前記上下弦材と斜材とを連結すると共に上弦材及び下弦材を隣接する既設上下弦材にそれぞれＰＣ緊張材で連結してトラス橋を架設することを特徴とするトラス橋の架設方法。   The upper chord material and the lower chord material made of precast concrete segments projecting connecting metal fittings to be connected to the diagonal material, and the diagonal material provided with the connecting end portions of the connecting metal metal at both ends are individually manufactured in advance and installed at the installation site. The truss bridge is constructed by connecting the upper and lower chord members and the diagonal member, and connecting the upper chord member and the lower chord member to the adjacent existing upper and lower chord members with PC tension members, respectively. 前記上弦材がトラス橋の上床版と一体のプレキャストコンクリートセグメントであることを特徴とする請求項１記載のトラス橋の架設方法。   2. The truss bridge erection method according to claim 1, wherein the upper chord material is a precast concrete segment integrated with an upper floor slab of the truss bridge. 前記下弦材がトラス橋の下床版と一体のプレキャストコンクリートセグメントであることを特徴とする請求項１記載のトラス橋の架設方法。   2. The truss bridge erection method according to claim 1, wherein the lower chord material is a precast concrete segment integrated with a lower floor slab of the truss bridge.
JP2007119155A 2007-04-27 2007-04-27 Construction method for truss bridge Pending JP2008274636A (en)

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Publication number Priority date Publication date Assignee Title
CN103290785A (en) * 2013-06-30 2013-09-11 中铁一局集团有限公司 Closure method for height variable continuous steel truss girder

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JP2003147727A (en) * 2001-11-14 2003-05-21 Kajima Corp Composite box girder and construction method therefor
JP2003193430A (en) * 2001-12-28 2003-07-09 Kajima Corp Construction method of composite truss bridge
JP2003193424A (en) * 2001-12-28 2003-07-09 Kajima Corp Composite truss bridge and its construction method
JP2006241901A (en) * 2005-03-04 2006-09-14 Kajima Corp Hinge joint structure of rc structural member

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JP2003147727A (en) * 2001-11-14 2003-05-21 Kajima Corp Composite box girder and construction method therefor
JP2003193430A (en) * 2001-12-28 2003-07-09 Kajima Corp Construction method of composite truss bridge
JP2003193424A (en) * 2001-12-28 2003-07-09 Kajima Corp Composite truss bridge and its construction method
JP2006241901A (en) * 2005-03-04 2006-09-14 Kajima Corp Hinge joint structure of rc structural member

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103290785A (en) * 2013-06-30 2013-09-11 中铁一局集团有限公司 Closure method for height variable continuous steel truss girder
CN103290785B (en) * 2013-06-30 2015-07-01 中铁一局集团有限公司 Closure method for height variable continuous steel truss girder

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