JP2003147727A - Composite box girder and construction method therefor - Google Patents
Composite box girder and construction method thereforInfo
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- JP2003147727A JP2003147727A JP2001348348A JP2001348348A JP2003147727A JP 2003147727 A JP2003147727 A JP 2003147727A JP 2001348348 A JP2001348348 A JP 2001348348A JP 2001348348 A JP2001348348 A JP 2001348348A JP 2003147727 A JP2003147727 A JP 2003147727A
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- Prior art keywords
- box girder
- diagonal member
- tensile
- block
- compression
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本願発明は、箱桁のウェブ部
分に圧縮斜材と引張斜材を用いた複合箱桁の構造および
その施工方法に関するものであり、例えば橋梁上部構造
などに適用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a composite box girder using a compression diagonal member and a tensile diagonal member in a web portion of a box girder and a construction method thereof, and is applied to, for example, a bridge superstructure. .
【０００２】[0002]
【従来の技術】橋梁の桁の形式として、ＰＣ箱桁橋や鋼
箱桁橋などの箱桁構造を用いたものがある。2. Description of the Related Art There is a type of bridge girder that uses a box girder structure such as a PC box girder bridge or a steel box girder bridge.
【０００３】ＰＣ箱桁橋の場合、箱型断面の鉄筋コンク
リート製またはプレストレストコンクリート製のプレキ
ャストブロックを張出し架設などにより施工すること
で、比較的簡易な施工設備で、短い工期で橋梁を構築す
ることができる。In the case of a PC box girder bridge, a precast block made of reinforced concrete or prestressed concrete having a box-shaped cross section can be constructed by overhanging to construct a bridge with a relatively simple construction facility in a short construction period. it can.
【０００４】また、箱桁の重量を軽量化して構造の合理
化や施工性の向上を図るため、ＰＣ箱桁橋のウェブを波
鋼板に置き換えたもの（例えば特開２００１−８１７２
０号公報等参照）や、ウェブ部分をトラス構造とした鋼
コンクリート複合トラス橋（例えば、特開平１１−２２
２８１６号公報、特開２０００−１０４２１９号公報等
参照）などがある。Further, in order to reduce the weight of the box girder to rationalize the structure and improve workability, the web of the PC box girder bridge is replaced with corrugated steel sheet (for example, Japanese Patent Laid-Open No. 2001-8172).
No. 0), or a steel-concrete composite truss bridge having a truss structure in the web portion (for example, JP-A-11-22).
2816, JP 2000-104219 A, etc.).
【０００５】[0005]
【発明が解決しようとする課題】従来のＰＣ箱桁橋の欠
点として、せん断力に抵抗させるためにはウェブが厚く
なり、橋梁上部工の重量が重くなることで、下部工の規
模も大きなものが必要となっていた。As a drawback of the conventional PC box girder bridge, the web is thick to resist shearing force, and the weight of the bridge superstructure is heavy, so that the scale of the substructure is large. Was needed.
【０００６】また、ウェブが厚くなると、ＰＣ鋼材等で
の緊張力が分散してしまい、所定の導入力を導入するた
めには大きな緊張力が必要となる。このため、ＰＣ鋼材
等の量も多くなる。Further, when the web becomes thicker, the tension force of the PC steel material or the like is dispersed, and a large tension force is required to introduce a predetermined introduction force. Therefore, the amount of PC steel and the like also increases.
【０００７】さらに、張出し架設を行うためには、単一
のプレキャストブロックの大きさに限度がある。Furthermore, there is a limit to the size of a single precast block in order to carry out overhang construction.
【０００８】複合トラス橋について、トラス構造は、理
論上、格点部がピン構造であるから軸力のみ負担する
が、複合トラスは格点部が剛結もしくはそれに近い構造
となるため曲げとせん断が作用する。また、それに耐え
る構造にするためには大きな格点部が必要となる。ま
た、現場での組立て・コンクリート打設作業を伴うた
め、現場作業が煩雑になるといった課題がある。[0008] Regarding the composite truss bridge, the truss structure theoretically bears only the axial force because the rating portion is a pin structure, but the compound truss has a structure in which the rating portion is rigidly connected or close to it, so bending and shearing occur. Works. In addition, a large graded portion is required to make the structure resistant to it. Further, there is a problem that the site work becomes complicated because of the assembling and concrete placing work on site.
【０００９】本願発明は、上述のような従来の箱桁構造
の課題を解決することを目的としたものであり、桁断面
の縮小により軽量化が図れ、かつ箱桁を構成する各部材
のプレキャスト化が容易で、施工性、経済性に優れた複
合箱桁およびその施工方法を提供することを目的として
いる。The present invention is intended to solve the problems of the conventional box girder structure as described above, and it is possible to reduce the weight by reducing the cross section of the girder and to precast each member constituting the box girder. It is an object of the present invention to provide a composite box girder that is easy to realize, has excellent workability, and is economical, and a construction method thereof.
【００１０】[0010]
【課題を解決するための手段】本願の請求項１に係る複
合箱桁は、複数の上床版ブロックと下床版ブロックと
を、箱桁のウェブ部分に位置するそれぞれ独立化した複
数の圧縮斜材と引張斜材とで連結するとともに、前記上
床版ブロックどうしおよび下床版ブロックどうしを箱桁
軸方向に連結してなることを特徴とするものである。A composite box girder according to claim 1 of the present application has a plurality of upper and lower floor slab blocks, each of which has a plurality of independent compression diagonals located in the web portion of the box girder. It is characterized in that the upper floor slab blocks and the lower floor slab blocks are connected to each other in the box girder axial direction while being connected to each other by a timber and a tensile diagonal member.
【００１１】圧縮斜材としては、高強度コンクリート、
短繊維補強コンクリート、コンクリート充填鋼管、また
はＦＲＰなどの材料からなるものが考えられる。また、
プレキャスト化することで、現場施工における工期短縮
が図れる。As the compression diagonal material, high strength concrete,
It may be made of a material such as short fiber reinforced concrete, concrete-filled steel pipe, or FRP. Also,
Precasting can shorten the construction period for on-site construction.
【００１２】圧縮斜材は、主として圧縮抵抗力を期待し
たものであるが、交番荷重が作用するような設計条件で
は引張強度も高いものを用いることも考えられる。The compression diagonal member is mainly expected to have a compression resistance force, but it is also possible to use one having a high tensile strength under the design condition where an alternating load acts.
【００１３】引張斜材は、主として引張抵抗力を期待し
たものであり、部材の小型化、プレキャスト化した場合
の取り扱いの良さからＰＣ鋼棒、ＰＣケーブルなどが考
えられるが、特にこれらに限定されるものではない。The tensile diagonal member is mainly expected to have a tensile resistance, and PC steel rods, PC cables and the like are conceivable from the viewpoint of easy handling when the member is downsized and precast, but it is particularly limited to these. Not something.
【００１４】また、圧縮斜材と引張斜材は、立面視で交
差するように配置することで圧縮斜材および引張斜材と
しての機能を効率良く発揮することができるが、交番荷
重が作用するような設計条件では、同じ断面で圧縮斜材
と引張斜材を配置することも考えられる。Further, the compression diagonal member and the tension diagonal member can efficiently exhibit their functions as the compression diagonal member and the tension diagonal member by arranging them so as to intersect each other in an elevation view, but the alternating load acts. Under such design conditions, it may be possible to arrange the compression diagonal member and the tensile diagonal member in the same cross section.
【００１５】より具体的には、例えば、圧縮斜材を挟む
ように引張斜材を同方向に配置したり、あるいは、圧縮
斜材としての鋼管の中に引張斜材としてのＰＣ鋼棒を通
すなど、圧縮斜材の中に引張斜材を通す配置も考えられ
る。この場合、交番荷重の方向に応じて、その時々に実
質的に圧縮斜材と引張斜材の一方が機能することにな
る。More specifically, for example, the tension diagonal members are arranged in the same direction so as to sandwich the compression diagonal member, or a PC steel rod as the tensile diagonal member is passed through a steel pipe as the compression diagonal member. It is also conceivable to arrange the tensile diagonal member in the compressed diagonal member. In this case, one of the compression diagonal member and the tensile diagonal member substantially functions depending on the direction of the alternating load.
【００１６】また、圧縮斜材と引張斜材は、基本的には
ＰＣ箱桁のウェブを置き換えた構造に相当し、ＰＣ箱桁
のウェブ位置で箱桁軸方向に延びる形で配されるが、ね
じり剛性等の確保を目的に、箱桁軸方向と直交する方向
などにも配置することもできる。The compression diagonal member and the tensile diagonal member basically correspond to the structure in which the web of the PC box girder is replaced, and are arranged so as to extend in the box girder axial direction at the PC box girder web position. For the purpose of ensuring torsional rigidity and the like, they can be arranged in a direction orthogonal to the box girder axis direction.
【００１７】上床版ブロックおよび下床版ブロックは、
基本的にはＰＣ箱桁の上床版および下床版に相当するも
のであるが、高強度コンクリートまたは短繊維補強コン
クリートからなる版状のプレキャスト部材を用いること
で、断面積を抑え、高強度を維持しつつ軽量化が図れ、
また現場における組立て・架設作業が容易となる。The upper floor block and the lower floor block are
Basically, it corresponds to the upper and lower floor slabs of PC box girders, but by using plate-shaped precast members made of high-strength concrete or short fiber reinforced concrete, the cross-sectional area is suppressed and high strength is achieved. We can reduce the weight while maintaining,
In addition, on-site assembly and erection work becomes easy.
【００１８】請求項２は、請求項１に係る複合箱桁にお
いて、前記引張斜材が実質的に引張力のみに抵抗する斜
材、例えばＰＣ鋼棒やＰＣケーブル等である場合を限定
したものである。A second aspect of the present invention is a composite box girder according to the first aspect, wherein the tensile diagonal member is a diagonal member that substantially resists only a tensile force, such as a PC steel rod or a PC cable. Is.
【００１９】また、請求項３は、請求項１または２に係
る複合箱桁において、前記上床版ブロック、下床版ブロ
ック、圧縮斜材、および引張斜材がそれぞれプレキャス
ト化されている場合を限定したものである。A third aspect of the present invention is limited to the composite box girder according to the first or second aspect, wherein the upper slab block, the lower slab block, the compression diagonal member and the tensile diagonal member are precast. It was done.
【００２０】請求項４は、請求項１、２または３に係る
複合箱桁において、前記圧縮斜材と引張斜材が立面視で
Ｘ字状に交差するように配置されている場合を限定した
ものであり、圧縮抵抗力を発揮する圧縮斜材と引張抵抗
力を発揮する引張斜材とをバランスさせることで効率的
な応力伝達が図れる。A fourth aspect of the present invention is limited to the composite box girder according to the first, second or third aspect, wherein the compression diagonal member and the tensile diagonal member are arranged so as to intersect each other in an X shape in an elevation view. Therefore, efficient stress transmission can be achieved by balancing the compression diagonal material that exhibits compression resistance and the tensile diagonal material that exhibits tensile resistance.
【００２１】請求項５は、請求項１、２、３または４に
係る複合箱桁において、前記上床版ブロックまたは下床
版ブロックと、前記圧縮斜材または引張斜材との接合部
をピン接合としてある場合を限定したものである。According to a fifth aspect of the present invention, in the composite box girder according to the first, second, third or fourth aspect, the upper slab block or the lower slab block is joined to the compression diagonal member or the tensile diagonal member by pin joining. This is a limited case.
【００２２】本願発明では、圧縮斜材と引張斜材とを組
み合わせ、斜材断面の縮小を図っているため、上下床版
と圧縮斜材や引張斜材との接合部をピン接合とすること
が比較的容易であり、それにより圧縮斜材や引張斜材が
実質的に曲げもせん断も受けることなく軸方向の力にだ
け抵抗すればよく、より合理的な構造として部材断面の
縮小、軽量化を図ることができる。In the present invention, the compression diagonal member and the tension diagonal member are combined to reduce the cross section of the diagonal member. Therefore, the joint between the upper and lower floor slabs and the compression diagonal member or the tensile diagonal member is pin-bonded. It is relatively easy to do so that the compression diagonals and tensile diagonals need not resist bending or shearing, and only resist axial force. Can be realized.
【００２３】特に、上下床版と圧縮斜材や引張斜材をそ
れぞれプレキャスト化し、かつ接合部をピン接合とする
ことで、現場作業を大幅に簡略化することができる。In particular, by precasting the upper and lower floor slabs and the compression slabs and tension slabs and forming the joints with the pin joints, the site work can be greatly simplified.
【００２４】本願の請求項６に係る発明は、請求項３、
４または５に係る複合箱桁の施工方法であって、既設の
下床版ブロックの箱桁軸方向前方に新設の下床版ブロッ
クを連結するとともに、既設の上床版ブロックと前記新
設の下床版ブロックを引張斜材で連結する工程と、続い
て既設の上床版ブロックの箱桁軸方向前方に新設の上床
版ブロックを連結するとともに、前記新設の下床版ブロ
ックと前記新設の上床版ブロックを圧縮斜材で連結する
工程とを繰り返すことで、張出し架設して行くことを特
徴とするものである。The invention according to claim 6 of the present application is based on claim 3,
A method for constructing a composite box girder according to 4 or 5, wherein a new lower floor slab block is connected in front of the existing lower floor slab block in the box girder axial direction, and the existing upper floor slab block and the new lower floor are The step of connecting the plate blocks with a tensile diagonal member, and subsequently connecting the new upper floor plate block in the box girder axial direction forward of the existing upper floor plate block, and the new lower floor plate block and the new upper floor plate block. It is characterized in that it is extended and erected by repeating the step of connecting with a compression diagonal member.
【００２５】まず、下床版ブロックを既設の下床版ブロ
ックに連結して張出す作業では引張斜材を用いること
で、既設の上床版ブロックから斜めに支持することがで
き、安定した状態で上床版ブロックの連結、圧縮斜材の
取付けといった作業を行うことができる。これらの作業
の繰り返しにより、効率良く複合箱桁の架設を行うこと
ができる。First, in the work of connecting the lower floor slab block to the existing lower floor slab block and extending it, it is possible to support diagonally from the existing upper floor slab block by using a tensile diagonal member, and in a stable state. Work such as connecting upper deck blocks and attaching compression diagonals can be performed. By repeating these operations, it is possible to efficiently construct the composite box girder.
【００２６】なお、下床版ブロックどうし、および上床
版ブロックどうしを連結した状態では、適宜、ＰＣ鋼材
などによる緊張を行うことで、張出し架設における既設
部分を安定させることができる。When the lower floor slab blocks are connected to each other and the upper floor slab blocks are connected to each other, the existing portion in the overhanging construction can be stabilized by appropriately tensioning the PC steel material.
【００２７】[0027]
【発明の実施の形態】図１は、本願発明の複合箱桁の基
本構造を示したもので、この例では図１(a)に示される
ように、上床版ブロック１および下床版ブロック２がそ
れぞれ箱桁軸方向に連結され、上下の床版ブロック１，
２を立面視でＸ字状に交差する圧縮斜材３と引張斜材４
とで連結している。1 shows the basic structure of a composite box girder of the present invention. In this example, as shown in FIG. 1 (a), an upper floor slab block 1 and a lower floor slab block 2 are shown. Are connected to each other in the axial direction of the box girder, and the upper and lower floor slab blocks 1,
Compressed diagonal member 3 and tensile diagonal member 4 that intersect 2 in an X shape in elevation.
It is connected with.
【００２８】図１(b) は箱桁軸方向から見た図であり、
この例では箱桁の両側のウェブ位置に加え、中央にも圧
縮斜材３と引張斜材４を配置している。また、引張斜材
４は各圧縮斜材３の両側に配置してある。ただし、圧縮
斜材３と引張斜材４の配置は種々考えられ、複合箱桁の
上下の床版ブロック１，２を安定的に連結できる構造で
あれば特に限定されない。FIG. 1 (b) is a view seen from the axial direction of the box girder,
In this example, in addition to the web positions on both sides of the box girder, the compression diagonal member 3 and the tensile diagonal member 4 are also arranged in the center. The tensile diagonal members 4 are arranged on both sides of each compression diagonal member 3. However, various arrangements of the compression diagonal member 3 and the tensile diagonal member 4 are conceivable, and the arrangement is not particularly limited as long as the upper and lower floor slab blocks 1 and 2 of the composite box girder can be stably connected.
【００２９】上下の床版ブロック１，２は版状のプレキ
ャスト部材からなり、上床版ブロック１どうしおよび下
床版ブロック２どうしを橋軸方向に連結する。橋軸方向
のプレストレスの導入は、施工段階においても行うこと
ができるが、一般的には施工時と完成時ではプレストレ
スの導入量は異なる。The upper and lower floor slab blocks 1 and 2 are composed of plate-shaped precast members, and connect the upper floor slab block 1 and the lower floor slab block 2 to each other in the bridge axis direction. The introduction of prestress in the direction of the bridge axis can be performed at the construction stage as well, but generally the amount of prestress introduced is different at the time of construction and at the time of completion.
【００３０】圧縮斜材３は例えば高強度コンクリート、
短繊維補強コンクリート、コンクリート充填鋼管など高
い圧縮耐力を有するものが考えられ、一方、引張斜材４
としては例えばＰＣ鋼棒、ＰＣケーブルなど高い引張抵
抗力を有し、かつ断面をできるだけ小さく抑え、軽量化
が図れるものが考えられる。The compression diagonal member 3 is, for example, high strength concrete,
Concretes with high compressive strength such as short fiber reinforced concrete and concrete-filled steel pipes are considered, while tensile diagonals 4
For example, PC steel rods, PC cables, and the like which have high tensile resistance and can be made lightweight by suppressing the cross section as small as possible.
【００３１】さらに、これらの圧縮斜材３、引張斜材４
についてもプレキャスト化することで、現場における作
業が簡略化され、工期の短縮が図れる。Furthermore, these compression diagonal members 3 and tensile diagonal members 4
Also, by precasting, the work at the site can be simplified and the construction period can be shortened.
【００３２】図２は、圧縮斜材３の上床版ブロック１へ
のピン接合部の一例を示したものである。なお、図示し
ないが下床版ブロックとの接合部についても同様に考え
ることができる。FIG. 2 shows an example of a pin joint portion to the upper floor block 1 of the compression diagonal member 3. Although not shown, the joint with the lower floor slab can be similarly considered.
【００３３】この例では、圧縮斜材３の端部断面を円弧
状に形成し、一方、上床版ブロック１の底面には圧縮斜
材３の端部断面に対応する円弧状断面の溝（圧縮斜材３
の端部が橋軸方向にのみ円弧状となる場合）あるいは球
面状の凹部（圧縮斜材３の端部を球面状とする場合）を
形成し、この溝または凹部に合成ゴムなどの緩衝材１４
を介して圧縮斜材３の端部を受ける形でピン接合部１１
を形成している。In this example, the end section of the compression diagonal member 3 is formed in an arc shape, while the groove (compression) of the arc section corresponding to the end section of the compression diagonal member 3 is formed on the bottom surface of the upper floor block 1. Diagonal material 3
End of the compression arc is only arcuate in the bridge axis direction) or a spherical recess (when the end of the compression diagonal member 3 is spherical) is formed, and a buffer material such as synthetic rubber is provided in the groove or recess. 14
The pin joint portion 11 so as to receive the end portion of the compression diagonal member 3 via
Is formed.
【００３４】また、その固定手段としては、圧縮斜材３
の端部に予めボルト孔１２を形成しておき、上床版ブロ
ック１の上面側から先端がボルト状の緊張用鋼材１３を
ボルト孔１２に螺合するようになっている。As the fixing means, a compression diagonal member 3 is used.
The bolt holes 12 are formed in advance at the end portions of the upper floor slab block 1, and the tension steel material 13 having a bolt-shaped tip is screwed into the bolt holes 12 from the upper surface side of the upper floor slab block 1.
【００３５】なお、緊張用鋼材１３として必要な引張耐
力を有するものを用いることで、小さな引張力に対して
抵抗させることができる。By using a tensile steel material 13 having a necessary tensile strength, it is possible to resist a small tensile force.
【００３６】なお、ボルト孔１２については、内面にボ
ルト孔を有するアンカー金具を埋め込むなどして形成す
ることができ、また圧縮斜材３の端部の補強のため、部
分的に補強用の短繊維などを混入したコンクリートを用
いることもできる。The bolt hole 12 can be formed by embedding an anchor metal fitting having a bolt hole on the inner surface thereof, and for the purpose of reinforcing the end portion of the compression diagonal member 3, a short reinforcing wire is partially used. It is also possible to use concrete mixed with fibers or the like.
【００３７】図３は、引張斜材４の上床版ブロックへ１
のピン接合部の一例を示したものである。なお、図示し
ないが下床版ブロックとの接合部についても同様に考え
ることができる。FIG. 3 shows an upper floor slab block 1 of a tensile diagonal member 4.
3 shows an example of the pin joint portion of FIG. Although not shown, the joint with the lower floor slab can be similarly considered.
【００３８】この例では、ＰＣケーブルなどからなる引
張斜材４の定着端部が上床版ブロック１の断面内に位置
するようにし、かつその定着端部が上床版ブロック１内
に埋め込んだアンカー装置２２の円弧状の溝または球面
状の凹部内で回動できるようにすることでピン接合部２
１を形成している。In this example, the anchor device in which the fixing end portion of the tension diagonal member 4 made of a PC cable or the like is located within the cross section of the upper floor block 1, and the fixing end portion is embedded in the upper floor block 1. By making it possible to rotate in the arc-shaped groove or the spherical concave portion of the pin 22,
1 is formed.
【００３９】図４は、引張斜材４の上床版ブロック１へ
のピン接合部の他の例を示したものである。図示しない
が下床版ブロックとの接合部についても同様に考えるこ
とができる。FIG. 4 shows another example of the pin joint portion to the upper floor block 1 of the tension diagonal member 4. Although not shown, the joint with the lower floor slab can be similarly considered.
【００４０】この例では、引張斜材４として薄板状の鋼
材を用い、その端部を上床版１内に埋め込んだアンカー
装置３２のピン３３に取り付けることでピン接合部３１
を形成している。In this example, a thin plate-shaped steel material is used as the tensile diagonal member 4, and the end portion thereof is attached to the pin 33 of the anchor device 32 embedded in the upper floor slab 1, so that the pin joint portion 31 is formed.
Is formed.
【００４１】図５は、圧縮斜材３および引張斜材４の上
床版ブロック１への接合構造のさらに他の例を示したも
のである。また、図６および図７は、その接合構造を複
合箱桁橋に適用した場合の全景と桁内の概観を示したも
のである。FIG. 5 shows still another example of the joint structure of the compression diagonal member 3 and the tensile diagonal member 4 to the upper slab block 1. Further, FIGS. 6 and 7 show an overall view and an inside view of the girder when the joint structure is applied to a composite box girder bridge.
【００４２】この例では上床版ブロック１の下面（下床
版ブロック２の場合は上面）に圧縮斜材受け部４１を設
け、端部を円弧状の断面とした鋼材などからなる圧縮斜
材３の円弧状断面部分をこれに対応する溝部４３で受
け、ピン接合としている。In this example, a compression diagonal member receiving portion 41 is provided on the lower surface of the upper floor slab block 1 (upper surface in the case of the lower floor slab block 2), and the compression diagonal material 3 is made of steel or the like having an arc-shaped cross section at its end. The corresponding arcuate cross section is received by the groove portion 43 corresponding to this, and is joined by pins.
【００４３】また、引張斜材４については、ＰＣ鋼棒あ
るいはＰＣケーブルなどを用い、上床版ブロック１の上
面（下床版ブロック２の場合は下面）に、圧縮斜材受け
部４２として溝状の凹部を形成し、溝内で引張斜材４の
端部を定着プレート４４およびナット４５で定着させて
いる。For the tensile diagonal member 4, a PC steel rod or a PC cable is used, and a groove-shaped compression diagonal member receiving portion 42 is formed on the upper surface of the upper floor slab block 1 (the lower surface in the case of the lower floor slab block 2). Is formed, and the end portion of the tension diagonal member 4 is fixed in the groove by the fixing plate 44 and the nut 45.
【００４４】図８は、本願発明の複合箱桁の施工方法を
複合箱桁橋の施工に適用した場合の一実施形態を示した
ものであり、以下の手順で複合箱桁の張出し作業を行う
ことができる。FIG. 8 shows an embodiment in which the method of constructing a composite box girder of the present invention is applied to the construction of a composite box girder bridge. The composite box girder is bulged in the following procedure. be able to.
【００４５】張出し架設により架設された既設部分の下
床版ブロック２の箱桁軸方向前方に、新設の下床版ブロ
ック２を連結し、これらをＰＣ鋼材などで緊張する（図
８(a) 参照）。なお、図示しないが、新設の下床版ブロ
ック２に予め引張斜材４の一端を取り付けた状態で架設
してもよい。A new lower floor slab block 2 is connected in front of the existing lower floor slab block 2 erected by overhanging in the box girder axial direction, and these are tensioned with PC steel or the like (FIG. 8 (a)). reference). Although not shown, one end of the tension diagonal member 4 may be attached to the new lower floor slab block 2 in advance.
【００４６】次に、既設の上床版ブロック１と新設の下
床版ブロック２との間をＰＣケーブルなどからなる引張
斜材４で連結する（図８(b) 参照）。Next, the existing upper floor slab block 1 and the new lower floor slab block 2 are connected by a tensile diagonal member 4 such as a PC cable (see FIG. 8 (b)).
【００４７】続いて、下床版ブロック２上に圧縮斜材３
を斜めにセットする（図８(c) 参照）。なお、図示しな
いが圧縮斜材３は適当な支持具または支保装置により支
持しておくことができる。Subsequently, the compression diagonal member 3 is placed on the lower slab block 2.
Set diagonally (see Figure 8 (c)). Although not shown, the compression diagonal member 3 can be supported by an appropriate supporting member or supporting device.
【００４８】既設の上床版ブロック１の箱桁軸方向前方
に、新設の上床版ブロック１を連結するとともに、下床
版ブロック２上にセットした圧縮斜材３の端部と連結す
る（図８(d) 参照）。その状態で、上床版ブロック１間
をＰＣ鋼材などで緊張する。A new upper floor slab 1 is connected to the front of the existing upper floor slab block 1 in the axial direction of the box girder, and is also connected to the end of the compression diagonal member 3 set on the lower floor slab 2 (FIG. 8). (See (d)). In that state, the upper floor block blocks 1 are tensioned with a PC steel material or the like.
【００４９】以上の作業により、１ブロックに相当する
張出し架設が完了し、この作業を所要回数繰り返すこと
で複合箱桁橋の張出し架設による施工を行うことができ
る。By the above work, the overhanging erection corresponding to one block is completed, and by repeating this work a required number of times, the construction by the overhanging erection of the composite box girder bridge can be performed.
【００５０】[0050]
【発明の効果】箱桁のウェブ相当する位置に、圧縮力に
抵抗する圧縮斜材と引張力に抵抗する引張斜材を配置す
ることで、桁の軽量化を図ることができる。The weight of the girder can be reduced by arranging the compression diagonal member that resists the compressive force and the tensile diagonal member that resists the tensile force at the position corresponding to the web of the box girder.
【００５１】また、圧縮斜材および引張斜材と上下の床
版ブロックとの接合部を、曲げモーメントを伝達しない
ピン接合とすることで、床版に導入されるプレストレス
が斜材に分散することがなくなり、接合部の構造も小さ
くすることができる。Further, the joint between the compression diagonal member and the tensile diagonal member and the upper and lower floor slab blocks is made into a pin joint which does not transmit a bending moment, so that the prestress introduced into the floor slab is dispersed in the diagonal member. And the structure of the joint can be made smaller.
【００５２】全ての部材をプレキャスト化することで、
現場での作業を少なくし、納入された部品を組み合わせ
るのみで、張出し架設が可能となる。By precasting all the members,
Overhanging is possible by reducing the on-site work and simply combining the delivered parts.
【図１】 本願発明の複合箱桁の基本構造を示したもの
で、(a) は箱桁の軸方向と直交する方向から見た立面
図、(b) は箱桁の軸方向から見た立面図である。1 shows the basic structure of a composite box girder of the present invention, (a) is an elevation view seen from a direction orthogonal to the axial direction of the box girder, (b) is seen from the axial direction of the box girder FIG.
【図２】 圧縮斜材の上床版ブロックへの接合構造の一
例を示す鉛直断面図である。FIG. 2 is a vertical cross-sectional view showing an example of a joint structure of a compression diagonal member to an upper floor slab block.
【図３】 引張斜材の上床版ブロックへの接合構造の一
例を示す鉛直断面図である。FIG. 3 is a vertical cross-sectional view showing an example of a joint structure of a tensile diagonal member to an upper slab block.
【図４】 引張斜材の上床版ブロックへの接合構造の他
の例を示したもので、(a) は箱桁軸方向の鉛直断面図、
(b) は箱桁軸方向と直交する方向の鉛直断面図、(c) は
上床版ブロックを下方から見上げた図である。[Fig. 4] Fig. 4 shows another example of the joint structure of the tensile diagonal member to the upper deck block, (a) is a vertical cross-sectional view in the box girder axial direction,
(b) is a vertical cross-sectional view in the direction orthogonal to the box girder axis direction, and (c) is a view of the upper deck block as seen from below.
【図５】 圧縮斜材および引張斜材の上床版ブロックへ
の接合構造のさらに他の例を示したもので、(a) は箱桁
軸方向の鉛直断面図、(b) は箱桁軸方向と直交する方向
の鉛直断面図、(c) は上床版ブロックを上方から見た図
である。[Fig. 5] Fig. 5 shows still another example of the joint structure of the compression diagonal member and the tensile diagonal member to the upper deck block, (a) is a vertical cross-sectional view in the box girder axis direction, and (b) is the box girder axis. A vertical cross-sectional view in a direction orthogonal to the direction, (c) is a view of the upper floor slab viewed from above.
【図６】 図５の接合構造を有する複合箱桁を複合箱桁
橋に適用した場合の概観を示す斜視図である。FIG. 6 is a perspective view showing an overview when a composite box girder having the joint structure of FIG. 5 is applied to a composite box girder bridge.
【図７】 図６に対応する桁内の概観を示す斜視図であ
る。FIG. 7 is a perspective view showing an overview inside a girder corresponding to FIG. 6;
【図８】 本願発明の複合箱桁の施工方法の一実施形態
における施工手順を示す概念図である。FIG. 8 is a conceptual diagram showing a construction procedure in an embodiment of a construction method for a composite box girder of the present invention.
１…上部床版ブロック、２…下部床版ブロック、３…圧
縮斜材、４…引張斜材、５…橋脚、１１…ピン接合部、
１２…ボルト孔、１３…緊張用鋼材、１４…緩衝材、２
１…ピン接合部、２２…アンカー装置、３１…ピン接合
部、３２…アンカー装置、３３…ピン、４１…圧縮斜材
受け部（ピン接合部）、４２…引張斜材受け部、４３…
溝部、４４…定着プレート、４５…ナットDESCRIPTION OF SYMBOLS 1 ... Upper slab block, 2 ... Lower slab block, 3 ... Compression diagonal, 4 ... Tensile diagonal, 5 ... Pier, 11 ... Pin connection part,
12 ... Bolt hole, 13 ... Tensile steel material, 14 ... Cushioning material, 2
DESCRIPTION OF SYMBOLS 1 ... Pin joint part, 22 ... Anchor device, 31 ... Pin joint part, 32 ... Anchor device, 33 ... Pin, 41 ... Compression diagonal member receiving part (pin joint part), 42 ... Tensile diagonal member receiving part, 43 ...
Grooves, 44 ... Fixing plate, 45 ... Nuts
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池谷 毅 東京都港区元赤坂１丁目２番７号 鹿島建 設株式会社内 (72)発明者 古市 耕輔 東京都港区元赤坂１丁目２番７号 鹿島建 設株式会社内 Ｆターム(参考） 2D059 AA08 AA14 CC06 GG55 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Takeshi Ikeya Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Inside the corporation (72) Inventor Kosuke Furuichi Kashima-ken, 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Inside the corporation F term (reference) 2D059 AA08 AA14 CC06 GG55
Claims (6)
とを、箱桁のウェブ部分に位置する複数の圧縮斜材と引
張斜材とで連結するとともに、前記上床版ブロックどう
しおよび下床版ブロックどうしを箱桁軸方向に連結して
なることを特徴とする複合箱桁。1. A plurality of upper slab blocks and a lower slab block are connected by a plurality of compression diagonal members and tensile diagonal members located in a web portion of a box girder, and the upper floor slab blocks and the lower floor slabs are connected to each other. A composite box girder characterized by connecting blocks in the box girder axial direction.
抗する斜材である請求項１記載の複合箱桁。2. The composite box girder according to claim 1, wherein the tensile diagonal member is a diagonal member that substantially resists only tensile force.
圧縮斜材、および引張斜材がそれぞれプレキャスト化さ
れている請求項１または２記載の複合箱桁。3. The upper floor slab block, the lower floor slab block,
The composite box girder according to claim 1 or 2, wherein the compression diagonal member and the tensile diagonal member are precast.
状に交差するように配置されている請求項１、２または
３記載の複合箱桁。4. The composite box girder according to claim 1, 2 or 3, wherein the compression diagonal member and the tensile diagonal member are arranged so as to intersect each other in an X shape in an elevation view.
クと、前記圧縮斜材または引張斜材との接合部をピン接
合としてある請求項１、２、３または４記載の複合箱
桁。5. The composite box girder according to claim 1, wherein the joint between the upper floor slab block or the lower floor slab and the compression diagonal member or tensile diagonal member is a pin joint.
施工方法であって、既設の下床版ブロックの箱桁方向前
方に新設の下床版ブロックを連結するとともに、既設の
上床版ブロックと前記新設の下床版ブロックを引張斜材
で連結する工程と、続いて既設の上床版ブロックの箱桁
軸方向前方に新設の上床版ブロックを連結するととも
に、前記新設の下床版ブロックと前記新設の上床版ブロ
ックを圧縮斜材で連結する工程とを繰り返すことで、張
出し架設して行くことを特徴とする複合箱桁の施工方
法。6. The method for constructing a composite box girder according to claim 3, 4 or 5, wherein a new lower floor slab block is connected to the front of the existing lower floor slab block in the box girder direction, and the existing upper floor is also connected. Connecting the plate block and the new lower floor plate block with a tensile diagonal member, and subsequently connecting the new upper floor plate block forward in the box girder axial direction of the existing upper floor plate block, and the new lower floor plate block. A method for constructing a composite box girder, characterized in that the block and the new upper floor slab block are connected by a compression diagonal member to repeat the erection.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001348348A JP3931635B2 (en) | 2001-11-14 | 2001-11-14 | Composite box girder and its construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008274636A (en) * | 2007-04-27 | 2008-11-13 | Ps Mitsubishi Construction Co Ltd | Construction method for truss bridge |
| JP2015132101A (en) * | 2014-01-14 | 2015-07-23 | 日本原子力発電株式会社 | Tide structure and construction method for the same |
| JP2017008669A (en) * | 2015-06-25 | 2017-01-12 | 三井住友建設株式会社 | Bridge girder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105484164B (en) * | 2015-12-30 | 2017-05-17 | 中交第二航务工程局有限公司 | Spanning type bailey beam bracket and construction method thereof |
-
2001
- 2001-11-14 JP JP2001348348A patent/JP3931635B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008274636A (en) * | 2007-04-27 | 2008-11-13 | Ps Mitsubishi Construction Co Ltd | Construction method for truss bridge |
| JP2015132101A (en) * | 2014-01-14 | 2015-07-23 | 日本原子力発電株式会社 | Tide structure and construction method for the same |
| JP2017008669A (en) * | 2015-06-25 | 2017-01-12 | 三井住友建設株式会社 | Bridge girder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3931635B2 (en) | 2007-06-20 |
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