JP3960068B2 - Steel / RC composite truss bridge girder structure - Google Patents

Steel / RC composite truss bridge girder structure Download PDF

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Publication number
JP3960068B2
JP3960068B2 JP2002035127A JP2002035127A JP3960068B2 JP 3960068 B2 JP3960068 B2 JP 3960068B2 JP 2002035127 A JP2002035127 A JP 2002035127A JP 2002035127 A JP2002035127 A JP 2002035127A JP 3960068 B2 JP3960068 B2 JP 3960068B2
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steel
lower chord
diagonal
bridge girder
composite truss
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JP2003239454A (en
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耕輔 古市
陽兵 平
健太郎 吉田
統央 山口
剛啓 日紫喜
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Kajima Corp
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Kajima Corp
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Description

【０００１】
【発明の属する技術分野】
本願発明は、上弦材と下弦材がＲＣ部材で、斜材が鋼管などの鋼材でそれぞれ形成された鋼・ＲＣ複合トラスの橋桁構造に関するものである。
【０００２】
【従来の技術】
例えば、トラス桁の上弦材と下弦材をＲＣ部材で、斜材を鋼管などの鋼材でそれぞれ形成する場合、一般に斜材の端部は上弦材と下弦材のコンクリート内に所定長さ埋設した状態で接続されている。
【０００３】
【発明が解決しようとする課題】
しかし、上弦材および下弦材と斜材との接合部には、鋼管周囲のコンクリートの長期変形および大きな荷重が繰り返し作用することにより、上弦材および下弦材側のコンクリートと斜材周囲との間に隙間が生ずることがあり、このため特に下弦材側の接続部においては、雨水や結露水が斜材の表面を伝わって接続部の隙間からコンクリート内部に浸入して斜材の端部を腐食させてしまうという課題があった。
【０００４】
一般に、この種の構造のトラスばりの場合、コンクリートと鋼管との接合部は最も重要な部位であり、この部分に腐食が生じることは構造部材として致命的であり、大きな課題になっていた。
【０００５】
本願発明は以上の課題を解決するためになされたもので、下弦材と斜材との接合部における斜材の腐食を防止することのできる鋼・ＲＣ複合トラスの橋桁構造を提供することを目的とする。
【０００６】
【課題を解決するための手段】
請求項１記載の鋼・ＲＣ複合トラスの橋桁構造は、ＲＣ構造の下弦材と当該下弦材に斜めに接続された鋼部材からなる斜材とを備えた鋼・ＲＣ複合トラスの橋桁構造であって、前記斜材の端部に当該斜材の外周に裾広がりとなる傘状に形成された水切り部材が取り付けられ、当該水切り部材の下端は前記下弦材の上面より離れていることを特徴とするものである。
【０００７】
この場合の水切り部材は、例えば金属板または合成樹脂板などから形成することができ、また鋼部材の周方向に複数に分割し、互いをネジ部材やピン部材、あるいはクリップ、さらには溶接などで連結できるように形成してもよい。
【０００８】
講求項２記載の鋼・ＲＣ複合トラスの橋桁構造は、ＲＣ構造の下弦材と当該下弦材に斜めに接続された鋼部材からなる斜材とを備えた鋼・ＲＣ複合トラスの橋桁構造であって、前記斜材の端部に螺せん状に巻き付けられ、かつ下端部が前記下弦材と斜材との接合部から離れる方向に延長された紐状の水切り部材が取り付けられてなることを特徴とするものである。
この場合の紐状の水切り部材としては、プラスチック等の合成樹脂材またはゴム等から形成されたものでよい。
【０００９】
請求項３記載の鋼・ＲＣ複合トラスの橋桁構造は、ＲＣ構造の下弦材と当該下弦材に斜めに接続された鋼部材からなる斜材とを備えた鋼・ＲＣ複合トラスの橋桁構造であって、前記斜材の端部に水切り部材が取り付けられ、当該水切り部材は前記斜材が挿通する筒状部材の外周に螺旋状または羽状の水切り片を多数突設して形成されてなることを特徴とするものである。
【００１０】
この場合の水切り部材は、例えば筒状部材の外周に水切り片を多数突設し、鋼部材を挿通させて取り付けられるようにしたもの、あるいはシート状または板状の片側面に水切り片を多数突設し、鋼部材の外周に巻き付けて取り付けられるようにしたもの等が考えられる。
【００１１】
また、水切り片の形状としては、例えば単にフィン状（羽状）をなすもの、あるいは螺せん状をなすもの等が考えられ、さらにこれらの水切り部材は金属板や合成樹脂板などから容易に形成することができる。また、これらの接合部構造は、単独で用いることも複数の構造を組み合わせて用いることもできる。
【００１２】
講求項４記載の鋼・ＲＣ複合トラスの橋桁構造は、請求項１〜３のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造において、斜材の端部の外周に水膨潤性のシール材が取り付けられ、かつ下弦材のコンクリート内に埋設されてなることを特徴とするものである。
この場合の水膨潤性のシール材は、鋼部材の接合部側端部の外周に一段に巻き付けて取り付けるだけでよいが、鋼部材の軸方向に所定間隔おきに複数段に取り付けてもよく、さらに螺せん状に巻き付けて取り付けてもよい。
【００１３】
講求項５記載の鋼・ＲＣ複合トラスの橋桁構造は、請求項１〜４のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造において、下弦材の斜材との接合部に水勾配が設けられてなることを特徴とするものである。
【００１４】
講求項６記載の鋼・ＲＣ複合トラスの橋桁構造は、請求項１〜５のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造において、下弦材の斜材との接合部に斜材の周方向に連続する溝状部が設けられ、当該溝状部にシール材が設けられてなることを特徴とするものである。
【００１５】
この場合、溝状部を設けないで鋼部材の周囲にシール材を巻き付けて直接取り付けることもできるが、溝状部を設けて取り付ける方が鋼部材周囲の隙間を確実に塞ぐことができる。
また、この場合のシール材としては、耐候性にすぐれ、止水性能を有するものであれば特に限定されないが、付着性能に優れた弾性材料からなるものを用いるのが望ましい。
【００１６】
講求項７記載の鋼・ＲＣ複合トラスの橋桁構造は、請求項１〜６のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造において、下弦材の斜材との接合部に弾性塗料が塗着してあることを特徴とするものである。
【００１７】
この場合の弾性塗料としては、耐候性にすぐれ、止水性能を有するものであれば特に限定されないが、例えばウレタン系の塗料などのように伸び性能に優れた弾性塗料を用いるのが望ましい。また、弾性塗料は必要に応じて複数層に重ねて塗着することにより止水性能を著しく高めることができる。
【００１８】
【発明の実施の形態】
図１（ａ）〜（ｃ）は、鋼・ＲＣ複合トラスの橋桁構造を示し、下弦材１はＲＣ部材またはＳＲＣ部材から形成され、斜材２は鋼管から形成されている。
【００１９】
各斜材２の下端部はそれぞれ、下弦材１のコンクリート内に所定長さ埋め込まれ、かつ鉄筋や鋼製ボックス等からなる定着部材３によってコンクリート内に定着することにより下弦材１に剛接合されている。
【００２０】
また、下弦材１の上面には、斜材２が接続されている中央部から下弦材１の両側に下り勾配となる水勾配１ａが形成されている。なお、各斜材２には下弦材１のコンクリート内に埋設された先端部分を除いて防錆塗料が塗着されている。
【００２１】
このように形成されていることで、各斜材２の表面を伝わって下弦材１の上に流れ落ちた雨水や結露水は、下弦材１の上を流れて速やかに排水される。したがって、斜材２の周囲にコンクリートのきれつなどによる多少の隙間が生じていても、雨水や結露水は接合部に到達して斜材２の周囲にできた隙間から下弦材１のコンクリート内に浸入して斜材２を腐食させる等の問題は発生しない。
【００２２】
図２（ａ），（ｂ）は、下弦材１と斜材２との接合部を示し、下弦材１側の表面に斜材２の外周に沿って連続する溝状部１ｂが形成され、かつこの溝状部１ｂにシール材４が斜材２の周方向に連続して充填されている。この場合のシール材４としては、例えば水膨潤性のシール材が用いられている。
【００２３】
このように形成されていることで、各斜材２の表面を伝わって下弦材１の上に流れ落ちた雨水や結露水は、下弦材１の上を流れて速やかに排水される。したがって、雨水や結露水が接合部に集中したとしても、雨水や結露水が斜材２の周囲に形成された隙間から下弦材１のコンクリート内に浸入して斜材２を腐食させる等の問題は発生しない。
【００２４】
なお図２（ｃ）は、接続部の止水効果をより確実なものとすべくなされたものであり、斜材２の表面に耐腐食性塗料が塗着され、またシール材４として水膨潤性シール材またはブチル系シール材が用いられ、かつこれらのシール材４は一定の圧をかけた状態で取り付けられている。
【００２５】
図３（ａ），（ｂ）は、下弦材１と斜材２との接合部を示し、下弦材１と斜材２との接合部の表面に弾性塗料５が下弦材１および斜材２の双方に連続して塗着されている。この場合の弾性塗料５には伸び性能にきわめて優れた塗料、例えばウレタン系の塗料が用いられている。
【００２６】
このように形成されていることで、各斜材２の表面を伝わって下弦材１の上に流れ落ちた雨水や結露水は、下弦材１の上を流れて速やかに排水される。
【００２７】
図４（ａ），（ｂ）は、下弦材１と斜材２下端部との接合部を示し、斜材２下端部の外周に水膨潤性のシール材６が斜材２の周方向にリング状に連続して取り付けられ、かつシール材６は斜材２の端部とともに下弦材１のコンクリート内に埋設されている。
【００２８】
この場合のシール材６は紐状に形成され、かつ斜材２の軸方向に所定間隔おきに一段ないしそれ以上に取り付けられている。また、シール材６は例えば図４（ａ）に図示するように下弦材１の材軸とほぼ平行をなすように、または図４（ｂ）に図示するように斜材２の材軸とほぼ直角をなすように取り付けられている。
【００２９】
このように形成されていることで、各斜材２と周囲コンクリートとの隙間は水膨張性のシール材６によって完全に塞がれているので、各斜材２の表面を伝わって下弦材１の上に流れ落ちた雨水や結露水は、斜材２周囲の隙間から下弦材１のコンクリート内に浸入することなく、下弦材１の上を流れて速やかに排水されるため、斜材２の下端部が腐食する心配は全くない。
【００３０】
図５（ａ），（ｂ）と図６（ａ），（ｂ）は共に、下弦材１と斜材２との接合部を示し、斜材２の外周に傘状に形成された水切り部材７が取り付けられている。水切り部材７は金属板または合成樹脂板などから裾広がりとなるような傘状に形成されている。
【００３１】
また、図５（ａ），（ｂ）の場合、水切り部材７の下弦材１側と斜材２側の両端部は下弦材１の上面と斜材２の外周に密着されているとともに完全にシールされ、また場合により図５（ｂ）に図示するように接合部の止水性をより高めるべく、水切り部材７の内側に樹脂やモルタル等の充填材８が充填されている。なお、この場合の水切り部材７には充填用の充填口７ａが設けられている。
【００３２】
また、図６（ａ），（ｂ）の場合、水切り部材７は下弦材１の上面より離して取り付けられ、斜材２側の端部のみが斜材２の外周に密着されているとともに完全にシールされている。また、水切り部材７の下弦材１側の端部は、例えば図６（ａ）に図示するように斜材２の材軸とほぼ直角をなすように形成されているか、あるいは図６（ｂ）に図示するように下弦材１の材軸とほぼ平行をなすように形成されている。さらに場合により図６（ｂ）に図示するように曲面状に形成されている。
【００３３】
このように形成されていることで、各斜材２の表面を流れ落ちる雨水や結露水は、水切り部材７の上を流れ、接合部から離れた位置に流れ落ちて速やかに排水される。したがって、斜材２の周囲にコンクリートのきれつ等による多少の隙間が生じていても、雨水や結露水は接合部に集中して斜材２の周囲にできた隙間から下弦材１のコンクリート内に浸入して斜材２を腐食させる等の問題は発生しない。
【００３４】
図７（ａ），（ｂ）は、下弦材１と斜材２との接合部を示し、斜材２の外周に紐状の水切り部材９が螺せん状に巻き付けられ、かつその下端側の端部９ａが接合部から離れた方向に向かって斜め下方に延長されている。
【００３５】
図８（ａ），（ｂ），（ｃ）は、下弦材１と斜材２との接合部を示し、斜材２を挿通し得る円筒形に形成され、かつ外表面に多数の水切り片１０ａが突設された水切り部材１０が斜材２の下端部に取り付けられている。
【００３６】
この場合の水切り部材１０は金属製または合成樹脂製として形成され、また場合により斜材２の外周に巻き付けて取り付けられるように形成されている。
【００３７】
なお、図６，７および図８で説明した鋼・ＲＣ部材の接合部構造は、斜材２の表面を流れる雨水や結露水を誘導して、接続部に流れ込む雨水や結露水の量を可能な限り減らすことが目的であり、したがって単独で用いられることは稀で、例えば図１〜図５の例で説明した鋼・ＲＣ部材の接合部構造と組み合わせて用いられるものである。
【００３８】
【発明の効果】
本願発明は、以上説明したとおりであり、ＲＣ部材の鋼部材との接合部に水勾配が設けられていることで、鋼部材の表面を伝わってＲＣ部材の上に流れ落ちた雨水や結露水がＲＣ部材の上を流れて速やかに排水されるようになっているので、たとえ鋼部材の周囲にコンクリートのきれつなどによる多少の隙間が生じていても、この隙間から雨水や結露水がコンクリート内に浸入して鋼部材を腐食させる等の構造部材として致命傷となるような問題を未然に防止することができる。
【図面の簡単な説明】
【図１】 （ａ）は鋼・ＲＣ複合トラス構造の橋桁の側面図、（ｂ）、 ( ｃ ) はＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、(ｂ)は（ａ）におけるイーイ線断面図、（ｃ）は（ａ）における口部拡大断面図である。
【図２】 ＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、（ａ），（ｃ）は図１（ａ）におけるハ部拡大断面図、（ｂ）は図２（ａ）におけるニーニ線断面図である、
【図３】 ＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、（ａ），（ｂ）は図１（ａ）におけるハ部拡大断面図である。
【図４】 ＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、（ａ），（ｂ）は図１（ａ）におけるハ部拡大断面図である。
【図５】 ＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、（ａ），（ｂ）は図１（ａ）におけるハ部拡大断面図である。
【図６】 ＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、（ａ），（ｂ）は図１（ａ）におけるハ部拡大断面図である。
【図７】 ＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、図１（ａ）におけるハ部拡大断面図である。
【図８】 ＲＣ構造の下弦材と鋼部材からなる斜材との接合部を示し、（ａ），（ｂ），（ｃ）はそれぞれ図１（ａ）におけるハ部拡大断面図である。
【符号の説明】
１ 下弦材
１ａ 水勾配
１ｂ 溝状部
２ 斜材
２ａ 耐腐食性塗料
３ 定着部材
４ シール材
５ 弾性塗料
６ 水膨潤性のシール材
７ 水切り部材
７ａ 充填口
８ 充填材
９ 水切り部材
１０ 水切り部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel / RC composite truss bridge girder structure in which an upper chord material and a lower chord material are RC members, and an oblique material is a steel material such as a steel pipe.
[0002]
[Prior art]
For example, when the upper chord material and the lower chord material of the truss girder are formed of RC members and the diagonal material is formed of a steel material such as a steel pipe, the end of the oblique material is generally embedded in a predetermined length in the concrete of the upper chord material and the lower chord material. Connected with.
[0003]
[Problems to be solved by the invention]
However, the joints between the upper and lower chords and the diagonal are affected by the long-term deformation of the concrete around the steel pipe and the large load repeatedly. For this reason, especially at the connection part on the lower chord material side, rainwater and dew condensation water travels along the surface of the diagonal material and enters the concrete from the connection gap and corrodes the end of the diagonal material. There was a problem that it would end up.
[0004]
In general, in the case of this type of truss beam, the joint between the concrete and the steel pipe is the most important part, and the occurrence of corrosion in this part is fatal as a structural member and has been a big problem.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a steel / RC composite truss bridge girder structure capable of preventing corrosion of the diagonal material at the joint between the lower chord material and the diagonal material. And
[0006]
[Means for Solving the Problems]
The steel / RC composite truss bridge girder structure according to claim 1 is a steel / RC composite truss bridge girder structure including a lower chord member of RC structure and a diagonal member made of a steel member obliquely connected to the lower chord member. A draining member formed in the shape of an umbrella that spreads at the outer periphery of the diagonal member is attached to the end of the diagonal member, and the lower end of the draining member is separated from the upper surface of the lower chord member. To do.
[0007]
In this case, the draining member can be formed of, for example, a metal plate or a synthetic resin plate, and is divided into a plurality of parts in the circumferential direction of the steel member, and is mutually screwed, pinned, clipped, or further welded. You may form so that it can connect.
[0008]
The steel / RC composite truss bridge girder structure described in Item 2 is a steel / RC composite truss bridge girder structure including a lower chord member of RC structure and a diagonal member made of a steel member obliquely connected to the lower chord member. A string-like draining member is attached to the end portion of the diagonal member in a spiral manner, and a lower end portion is extended in a direction away from a joint portion between the lower chord member and the diagonal member. It is what .
In this case, the string-like draining member may be formed of a synthetic resin material such as plastic or rubber.
[0009]
The steel / RC composite truss bridge girder structure according to claim 3 is a steel / RC composite truss bridge girder structure including a lower chord member of RC structure and a diagonal member made of a steel member obliquely connected to the lower chord member. In addition , a draining member is attached to the end of the diagonal member, and the draining member is formed by projecting a large number of spiral or feather-shaped draining pieces on the outer periphery of a cylindrical member through which the diagonal member is inserted. It is characterized by.
[0010]
The draining member in this case is, for example, a structure in which a large number of draining pieces are provided on the outer periphery of the cylindrical member and the steel member is inserted and attached, or a large number of draining pieces are projected on one side of the sheet or plate. The thing etc. which were installed and wound around the outer periphery of the steel member, etc. can be considered.
[0011]
Further, as the shape of the draining piece, for example, a simple fin-shaped (feathered) shape or a spiral-shaped shape can be considered, and these draining members are easily formed from a metal plate or a synthetic resin plate. can do. In addition, these junction structures can be used alone or in combination of a plurality of structures.
[0012]
The steel / RC composite truss bridge girder structure according to claim 4 is the steel / RC composite truss bridge girder structure according to any one of claims 1 to 3, wherein a water-swellable sealing material is provided on an outer periphery of an end portion of the diagonal member. And is embedded in the concrete of the lower chord material .
The water-swellable sealing material in this case only needs to be wound around and attached to the outer periphery of the joint side end of the steel member, but may be attached in multiple stages at predetermined intervals in the axial direction of the steel member, Further, it may be attached in a spiral form.
[0013]
The steel / RC composite truss bridge girder structure according to claim 5 is the steel / RC composite truss bridge girder structure according to any one of claims 1 to 4, wherein a water gradient is provided at a joint portion between the lower chord member and the diagonal member. It is characterized by being made.
[0014]
The steel / RC composite truss bridge girder structure according to claim 6 is the steel / RC composite truss bridge girder structure according to any one of claims 1 to 5, wherein A groove-like portion continuous in the direction is provided, and a sealing material is provided in the groove-like portion.
[0015]
In this case, the seal member can be wound around and directly attached to the periphery of the steel member without providing the groove portion, but the gap around the steel member can be reliably closed by providing the groove portion and attaching the seal member.
The sealing material in this case is not particularly limited as long as it has excellent weather resistance and water-stopping performance, but it is desirable to use a material made of an elastic material having excellent adhesion performance.
[0016]
The steel / RC composite truss bridge girder structure according to claim 7 is the steel / RC composite truss bridge girder structure according to any one of claims 1 to 6, wherein an elastic paint is applied to a joint portion of the lower chord material with the diagonal member. It is characterized by being worn.
[0017]
The elastic paint in this case is not particularly limited as long as it has excellent weather resistance and water-stopping performance. For example, it is desirable to use an elastic paint excellent in elongation performance such as urethane paint. In addition, the water-stopping performance can be remarkably enhanced by applying the elastic paint in a plurality of layers as necessary.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1A to 1C show a bridge girder structure of a steel / RC composite truss, wherein the lower chord member 1 is formed of an RC member or an SRC member, and the diagonal member 2 is formed of a steel pipe.
[0019]
The lower end of each diagonal member 2 is embedded in the concrete of the lower chord material 1 for a predetermined length, and is rigidly joined to the lower chord material 1 by being fixed in the concrete by a fixing member 3 made of a reinforcing bar, a steel box or the like. ing.
[0020]
Further, on the upper surface of the lower chord material 1, a water gradient 1 a that forms a downward gradient is formed on both sides of the lower chord material 1 from the central portion where the diagonal material 2 is connected. Each diagonal member 2 is coated with a rust preventive paint except for the tip portion embedded in the concrete of the lower chord member 1.
[0021]
By being formed in this way, rainwater and dew condensation water that has flowed down on the lower chord material 1 through the surface of each diagonal member 2 flows on the lower chord material 1 and is quickly drained. Therefore, even if there are some gaps due to cracks in the concrete around the diagonal member 2, rain water and dew condensation water reach the joints and pass through the gap around the diagonal member 2 in the concrete of the lower chord member 1. There is no problem of intruding into the material and corroding the diagonal member 2.
[0022]
2 (a) and 2 (b) show a joint portion between the lower chord member 1 and the diagonal member 2, and a groove-like portion 1b continuous along the outer periphery of the diagonal member 2 is formed on the surface of the lower chord member 1 side. In addition, the sealing material 4 is continuously filled in the circumferential direction of the diagonal member 2 in the groove-like portion 1b. As the sealing material 4 in this case, for example, a water-swellable sealing material is used.
[0023]
By being formed in this way, rainwater and dew condensation water that has flowed down on the lower chord material 1 through the surface of each diagonal member 2 flows on the lower chord material 1 and is quickly drained. Therefore, even if rainwater or condensed water concentrates on the joint, rainwater or condensed water enters the concrete of the lower chord material 1 through the gap formed around the diagonal material 2 and corrodes the diagonal material 2. Does not occur.
[0024]
FIG. 2 (c) is designed to make the water stop effect of the connecting portion more reliable, and the anti-corrosion paint is applied to the surface of the diagonal member 2, and the seal material 4 is swollen with water. The sealing material or butyl-based sealing material is used, and these sealing materials 4 are attached in a state where a certain pressure is applied.
[0025]
3A and 3B show a joint portion between the lower chord member 1 and the diagonal member 2, and the elastic paint 5 is applied to the lower chord member 1 and the diagonal member 2 on the surface of the joint portion between the lower chord member 1 and the diagonal member 2. FIG. It is continuously applied to both sides. In this case, the elastic paint 5 is a paint having excellent elongation performance, such as a urethane paint.
[0026]
By being formed in this way, rainwater and dew condensation water that has flowed down on the lower chord material 1 through the surface of each diagonal member 2 flows on the lower chord material 1 and is quickly drained.
[0027]
FIGS. 4A and 4B show a joint portion between the lower chord member 1 and the lower end portion of the diagonal member 2, and a water-swellable sealing material 6 is provided in the circumferential direction of the diagonal member 2 on the outer periphery of the lower end portion of the diagonal member 2. The seal material 6 is continuously attached in a ring shape, and is embedded in the concrete of the lower chord material 1 together with the end portion of the diagonal material 2.
[0028]
The sealing material 6 in this case is formed in a string shape, and is attached in one or more steps at predetermined intervals in the axial direction of the diagonal material 2. Further, the seal material 6 is substantially parallel to the material axis of the lower chord material 1 as shown in FIG. 4A, for example, or substantially the same as the material axis of the diagonal material 2 as shown in FIG. 4B. It is attached to make a right angle.
[0029]
Since the gap between each diagonal member 2 and the surrounding concrete is completely closed by the water-swellable sealing material 6, the lower chord member 1 is transmitted along the surface of each diagonal member 2. The rain water and dew condensation water that has flowed down the top of the diagonal member 2 flows quickly over the lower chord member 1 without entering the concrete of the lower chord member 1 through the gap around the diagonal member 2. There is no worry that the parts will corrode.
[0030]
5 (a) and 5 (b) and FIGS. 6 (a) and 6 (b) both show a joint portion between the lower chord material 1 and the diagonal material 2, and a draining member formed in an umbrella shape on the outer periphery of the diagonal material 2 7 is attached. The draining member 7 is formed in an umbrella shape that spreads from the metal plate or the synthetic resin plate.
[0031]
5A and 5B, both ends of the draining member 7 on the lower chord member 1 side and the diagonal member 2 side are in close contact with the upper surface of the lower chord member 1 and the outer periphery of the diagonal member 2 and completely. As shown in FIG. 5 (b), the water draining member 7 is filled with a filler 8 such as resin or mortar so as to further improve the water-stopping property. In this case, the draining member 7 is provided with a filling port 7a for filling.
[0032]
6 (a) and 6 (b), the draining member 7 is mounted away from the upper surface of the lower chord material 1, and only the end portion on the diagonal material 2 side is in close contact with the outer periphery of the diagonal material 2 and is complete. Is sealed. Further, the end of the draining member 7 on the lower chord member 1 side is formed so as to be substantially perpendicular to the material axis of the diagonal member 2 as shown in FIG. 6A, for example, or FIG. As shown in FIG. 2, the lower chord material 1 is formed so as to be substantially parallel to the material axis. Further, in some cases, it is formed in a curved surface as shown in FIG.
[0033]
By being formed in this way, rain water and dew condensation water that flows down the surface of each diagonal member 2 flows on the draining member 7, flows down to a position away from the joint, and is quickly drained. Therefore, even if there are some gaps due to cracks in the concrete around the diagonal member 2, rainwater and dew condensation water concentrates on the joint and from the gap formed around the diagonal member 2 in the concrete of the lower chord member 1 There is no problem of intruding into the material and corroding the diagonal member 2.
[0034]
7 (a) and 7 (b) show a joint portion between the lower chord member 1 and the diagonal member 2, and a string-like draining member 9 is spirally wound around the outer periphery of the diagonal member 2, and the lower end side thereof is shown in FIG. The end 9a is extended obliquely downward in a direction away from the joint.
[0035]
8 (a), 8 (b), and 8 (c) show the joint portion between the lower chord member 1 and the diagonal member 2, formed in a cylindrical shape through which the diagonal member 2 can be inserted, and a large number of draining pieces on the outer surface. A draining member 10 provided with a protrusion 10 a is attached to the lower end of the diagonal member 2.
[0036]
In this case, the draining member 10 is made of metal or synthetic resin, and is formed so as to be wound around the outer periphery of the diagonal member 2 and attached.
[0037]
The steel / RC member joint structure described with reference to FIGS. 6, 7 and 8 is capable of inducing rainwater and dew condensation water flowing on the surface of the diagonal member 2 to allow the amount of rainwater and dew condensation water flowing into the connection part. The purpose is to reduce as much as possible, and therefore, it is rarely used alone. For example, it is used in combination with the steel / RC member joint structure described in the examples of FIGS.
[0038]
【The invention's effect】
The invention of the present application is as described above, and rain water and dew condensation water that has flowed down on the RC member through the surface of the steel member by providing a water gradient at the joint portion of the RC member with the steel member. Since it flows on the RC member and drains quickly, even if there are some gaps around the steel member due to concrete cracks, rainwater and dew It is possible to prevent a problem that may cause fatal damage as a structural member such as corroding the steel member and corroding the steel member.
[Brief description of the drawings]
FIG. 1 (a) is a side view of a bridge girder of a steel / RC composite truss structure, (b) and ( c ) are joints between a lower chord member of an RC structure and a diagonal member made of a steel member, (b) (A) is a sectional view taken along the line E, and (c) is an enlarged sectional view of the mouth in (a).
FIGS. 2A and 2B show a joint portion between a lower chord member of an RC structure and an oblique member made of a steel member . FIGS. 2A and 2C are enlarged cross-sectional views of FIG. 1A and FIG. It is a Nini line sectional view in a).
FIGS. 3A and 3B show a joint portion between a lower chord member of an RC structure and an oblique member made of a steel member , and FIGS. 3A and 3B are enlarged sectional views of a portion C in FIG.
FIGS. 4A and 4B show a joint portion between a lower chord member of an RC structure and a diagonal member made of a steel member , and FIGS. 4A and 4B are enlarged sectional views of a portion C in FIG.
FIGS. 5A and 5B show a joint portion between a lower chord member of an RC structure and a diagonal member made of a steel member , and FIGS. 5A and 5B are enlarged sectional views of a portion C in FIG.
FIGS. 6A and 6B show joint portions between a lower chord member of an RC structure and a diagonal member made of a steel member, and FIGS. 6A and 6B are enlarged sectional views of a portion C in FIG.
FIG. 7 is an enlarged cross-sectional view of a portion C in FIG. 1A , showing a joint portion between a lower chord member of an RC structure and a diagonal member made of a steel member .
FIGS. 8A and 8B show joints between a lower chord member of an RC structure and an oblique member made of a steel member, and FIGS. 8A , 8B, and 8C are enlarged sectional views of a portion C in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower chord material 1a Water gradient 1b Groove part 2 Diagonal material 2a Corrosion-resistant paint 3 Fixing member 4 Seal material 5 Elastic paint 6 Water swelling seal material 7 Drain member 7a Filling port 8 Fill material 9 Drain member 10 Drain member

Claims (7)

ＲＣ構造の下弦材と当該下弦材に斜めに接続された鋼部材からなる斜材とを備えた鋼・ＲＣ複合トラスの橋桁構造であって、前記斜材の端部に当該斜材の外周に裾広がりとなる傘状に形成された水切り部材が取り付けられ、当該水切り部材の下端は前記下弦材の上面より離れていることを特徴とする鋼・ＲＣ複合トラスの橋桁構造。A steel / RC composite truss bridge girder structure comprising a lower chord member of RC structure and an oblique member made of a steel member obliquely connected to the lower chord member, wherein the end of the oblique member is provided on the outer periphery of the oblique member. A steel / RC composite truss bridge girder structure, wherein a draining member formed in an umbrella shape that spreads at the bottom is attached, and a lower end of the draining member is separated from an upper surface of the lower chord member . ＲＣ構造の下弦材と当該下弦材に斜めに接続された鋼部材からなる斜材とを備えた鋼・ＲＣ複合トラスの橋桁構造であって、前記斜材の端部に螺旋状に巻き付けられ、かつ下端部が前記下弦材と斜材との接合部から離れる方向に延長された紐状の水切り部材が取り付けられてなることを特徴とする鋼・ＲＣ複合トラスの橋桁構造。A steel / RC composite truss bridge girder structure comprising a lower chord member of RC structure and an oblique member made of a steel member obliquely connected to the lower chord member, and is spirally wound around an end of the oblique member, A steel / RC composite truss bridge girder structure, wherein a string-like draining member having a lower end portion extending in a direction away from a joint portion between the lower chord member and the diagonal member is attached. ＲＣ構造の下弦材と当該下弦材に斜めに接続された鋼部材からなる斜材とを備えた鋼・ＲＣ複合トラスの橋桁構造であって、前記斜材の端部に水切り部材が取り付けられ、当該水切り部材は前記斜材が挿通する筒状部材の外周に螺旋状または羽状の水切り片を多数突設して形成されてなることを特徴とする鋼・ＲＣ複合トラスの橋桁構造。A steel / RC composite truss bridge girder structure comprising a lower chord member of RC structure and a diagonal member made of a steel member obliquely connected to the lower chord member, with a draining member attached to the end of the diagonal member, The steel / RC composite truss bridge girder structure, wherein the draining member is formed by projecting a number of spiral or feather-shaped draining pieces on the outer periphery of a cylindrical member through which the diagonal member is inserted . 斜材の端部の外周に水膨潤性のシール材が取り付けられ、かつ下弦材のコンクリート内に埋設されてなることを特徴とする請求項１〜３のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造。The steel / RC composite truss according to any one of claims 1 to 3, wherein a water-swellable sealing material is attached to the outer periphery of the end portion of the diagonal member, and is embedded in the concrete of the lower chord material. Bridge girder structure. 下弦材の斜材との接合部に水勾配が設けられてなることを特徴とする請求項１〜４のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造。The steel / RC composite truss bridge girder structure according to any one of claims 1 to 4, wherein a water gradient is provided at a joint portion between the lower chord member and the diagonal member. 下弦材の斜材との接合部に斜材の周方向に連続する溝状部が設けられ、当該溝状部にシール材が設けられてなることを特徴とする請求項１〜５のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造。6. A groove-like portion continuous in the circumferential direction of the diagonal material is provided at a joint portion of the lower chord material with the diagonal material, and a sealing material is provided in the groove-shaped portion. Steel / RC composite truss bridge girder structure described in 1. 下弦材の斜材との接合部に弾性塗料が塗着してあることを特徴とする請求項１〜６のいずれかに記載の鋼・ＲＣ複合トラスの橋桁構造The bridge structure of the steel / RC composite truss according to any one of claims 1 to 6, wherein an elastic paint is applied to a joint portion between the lower chord member and the diagonal member.
JP2002035127A 2002-02-13 2002-02-13 Steel / RC composite truss bridge girder structure Expired - Fee Related JP3960068B2 (en)

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