JP2004036271A - Bridge - Google Patents
Bridge Download PDFInfo
- Publication number
- JP2004036271A JP2004036271A JP2002196195A JP2002196195A JP2004036271A JP 2004036271 A JP2004036271 A JP 2004036271A JP 2002196195 A JP2002196195 A JP 2002196195A JP 2002196195 A JP2002196195 A JP 2002196195A JP 2004036271 A JP2004036271 A JP 2004036271A
- Authority
- JP
- Japan
- Prior art keywords
- box girder
- bridge
- wind
- opening
- central
- 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.)
- Granted
Links
Images
Landscapes
- Bridges Or Land Bridges (AREA)
Abstract
Description
【0001】
【発明の属する技術分野】
この発明は、長大吊橋や斜張橋などの橋梁に係り、特に、高いフラッター発現風速を有し、耐フラッター性能に優れている橋梁に関するものである。
【0002】
【従来の技術】
たとえば、長大吊橋や斜張橋などの橋梁は、鉛直曲げやねじれの固有振動数が低いために、フラッターとよばれる発散振動が発現する風速(以下、フラッター発現風速と称する)が低くなる傾向にある。
このため、前記橋梁の断面形状としては、動的空力特性が良好な平板翼に近い偏平箱桁断面形状が採用されている。すなわち、前記橋梁は、箱桁構造をなすものである。
【0003】
ところが、偏平箱桁断面形状の箱桁構造をなす前記橋梁であっても、固有振動数が著しく低い場合には、依然、フラッター発現風速が低いという課題がある。そこで、フラッター発現風速を高くする技術として、たとえば、特公平3−65444号公報に記載の橋梁(第1従来例)、特開平11−280020号公報に記載の橋梁(第2従来例)がある。
【0004】
第1従来例の橋梁は、箱桁の中央部に上下方向の開口部を設け、この開口部の中央部を通って箱桁の上面から箱桁の下面に亘る鉛直の偏流板を設けたものである。
この橋梁は、風上側において、風の流れを偏流板により偏流させて、風下側において、風が箱桁の上・下面に再び付着するのを防止して、自励的空気力を抑制して、フラッター発現風速を高くするものである。
【0005】
また、第2従来例の橋梁は、風が通り抜ける構造の遮風壁を箱桁の中央の上面に設けたものである。
この橋梁は、遮風壁に風の流れの一部を通過させた状態で箱桁の上面の風速を低減させて、フラッター発現風速を高くするものである。
【0006】
しかしながら、上記第1、第2従来例には以下のような課題がある。すなわち、第1従来例においては、比較的広い開口部を必要とするため、開口部に相当する車線における舗装が確保できない。
また、第2従来例においては、ある程度フラッター発現風速を高くできるが、いまだ十分に高いとはいえない。
【0007】
このような第1,第2従来例の課題を解決するものとして、土木学会第55回年次学術講演会講演概要集I−B59に記載の橋梁(第3従来例)が提案された。
この第3従来例は、箱桁構造の橋梁であって、前記箱桁の中央分離帯部分には、開口部が連続的あるいは離散的に舗装部分を侵すことなく上下方向に開設されており、前記箱桁の中央上面および両端上面には、前記開口部への風導手段としての中央遮風壁および端部遮風壁がそれぞれ設けられており、前記橋桁の下面には検査車レールが設けられている、というものである。
この第3従来例においては、桁端部遮風壁、桁下面検査車レール各々の剥離干渉効果により、中央遮風壁及び中央開口部の制振効果が強調される流れのパターン(上下面の流れが断面に接近する流れのパターン)をつくり、フラッター発現風速を高くするものである。
【0008】
【発明が解決しようとする課題】
しかしながら、第3従来例にも以下のような課題が残されていた。
すなわち、中央遮風壁についてどのようなものが最も効率的にフラッター発現風速を高くできるのかについての明確な示唆がない。そのため、フラッター発現風速を高くする観点から中央遮風壁を高くすれば、利用者に閉塞感を与えてしまうことになる。
また、中央開口部との関係でいかなる中央遮風壁が最適かについての示唆もなく、この点での課題も残されていた。
【0009】
この発明はかかる課題を解決するためになされたものであり、フラッター発現風速が十分に高く、耐フラッター性能に優れ、且つ利用者に与える不快感を最小限に抑え、また開口間隔が自由に設定できることによる合理的な設計が可能となりうる橋梁を提供することを目的とする。
【0010】
【課題を解決するための手段】
本発明に係る橋梁は、箱桁構造の橋梁であって、箱桁の中央分離帯部分には、開口部が連続的あるいは離散的に舗装部分を侵すことなく上下方向に開設されており、箱桁の両端上面には端部遮風壁が設置され、箱桁下面には検査車レールが敷設され、箱桁の中央上面には前記開口部への風導手段としての充実型壁構造部材が設けられており、前記充実壁構造部材は高さが1.2m以上であることを特徴とするものである。
【0011】
上記風導手段により、箱桁の上面およびまたは下面を流れる風が風抜き用の開口部に導かれて箱桁の下面およびまたは上面に抜ける。このために、箱桁の上面と下面の圧力差が緩和されて、箱桁に作用する自励的空気力が小さくなり、フラッター発現風速が高くなる。
【0012】
なお、充実壁構造部材の高さは1.2mあればよく、2m以下にすることで利用者の閉塞感を招くことなく耐風効果を発揮することができる。
【0013】
【発明の実施の形態】
以下、この発明にかかる橋梁の実施の形態を添付図面を参照して説明する。
図1は本発明の実施の形態1である橋梁の一部の斜視図である。図において、1は長大吊橋や斜張橋などの橋梁であり、図中の矢印Aの方向に延びている。
橋梁1は、箱桁構造をなし、その断面形状は、たとえば、六角形の偏平箱桁断面形状をなしている。そして、この箱桁2の両端には、たとえば、断面三角形状の導風端部3が設けられている。
【0014】
箱桁2の中央部、すなわち、中央分離帯に対応する部分には、上下に貫通して開口する風抜き用の開口部4が設けられている。この開口部4は、橋梁1の橋軸方向に連続的に(もしくは、離散的に)舗装部分を侵すことなく設けられている。
この開口部4の上面には、グレーチング5が箱桁2の上面とほぼ面一となるように敷設されている。
なお、開口部4の下面にも、グレーチングを箱桁2の下面とほぼ面一となるように敷設してもよい。
【0015】
また、箱桁2には、風を開口部4に導いて抜けさせる風導手段が設けられている。この風導手段は、箱桁2の中央上面に設けられた中央遮風壁6と、箱桁2の両端上面に設けられた端部遮風壁7と、箱桁2の下面に敷設された検査車レール8とから構成されている。
中央遮風壁6は、箱桁2の中央の上面、すなわち、開口部4の上グレーチング5の中央に、橋梁1の長手方向に連続的に(もしくは、離散的に)設けられている。この中央遮風壁6は、高さが約1.2mの矩形断面の充実壁構造から構成されている。
なお、中央遮風壁6の高さを1.2mとした理由については後述する。
【0016】
端部遮風壁7は、箱桁2の両端上面、すなわち、橋梁1の欄干に対応する部分に、橋梁1の長手方向に連続的に(もしくは、離散的に)設けられている。この端部遮風壁7は、高さが約2〜3mのパンチングプレートなどの開口構造物で構成されている。
なお、この端部遮風壁7と、中央遮風壁6(上グレーチング5)との間の箱桁2の上面が、車両の走行用の車線となる。
検査車レール8は、箱桁2の下面に、橋梁1の長手方向に連続的に設けられている。この検査車レール8は、保守点検や維持管理などに使用されるものである。
【0017】
図2は本実施の形態にかかる橋梁の橋軸直角方向の断面図に風の流れを線で示したものである。
以下、本実施の形態の作用を図2に基づいて説明する。
まず、中央遮風壁6と端部遮風壁7と検査車レール8との作用により、水平方向に対して仰角±3度の範囲の風(なお、仰角+度の風とは、吹き上げる風であり、一方、仰角−度の風とは、吹き下ろす風である)の場合において、箱桁2の上面を流れる風(図2中、点線矢印にて示す)が開口部4に導かれて箱桁2の下面に抜ける。
一方、箱桁2の下面を流れる風(図2中実線矢印にて示す)が開口部4に導かれて箱桁2の上面に抜ける。
このように、中央遮風壁6、端部遮風壁7及び検査車レール8の作用により、上記のような風の流れができ、その結果、箱桁2の上面と下面の圧力差が緩和されて、箱桁2に作用する自励的空気力を低下させることができる。
【0018】
なお、本実施の形態では中央遮風壁6として高さ1.2mの充実壁構造部材を用いているが、ここで、本実施の形態の中央遮風壁6について、他の例と比較することによってその作用を説明する。
表1は中央遮風壁の形状による耐風性の比較を示したものである。
【0019】
【表1】
【0020】
表1においては、橋桁断面としてA〜Dの4種類のものを示した。これら4種類の断面は、中央遮風壁等の中央構造物のみが異なり、他の構成は共通している。中央構造物の種類としては、図3に示すように、角材を組み合わせた高さ0.8mの開放形からなる通常型防護柵(図3(a))、充実壁構造からなる高さ0.8mの充実型防護柵(0.8m)、充実壁構造からなる高さ1.2mの充実型防護柵(1.2m)の3種類である。
【0021】
断面Aは、従来技術の項で第3従来例として示したものであり、通常型防護柵(図3(a))上に格子状の暴風柵を設けたものである。この暴風柵は端部遮風壁7と同様の構造であり、高さが約2〜3mのパンチングプレートなどの開口構造物で構成されている。
断面Bは暴風柵なしで、通常型防護柵(図3(a))を設置したもの、断面Cは暴風柵なしで充実型防護柵(0.8m)を設置したもの、断面Dは暴風柵なしで充実型防護柵(1.2m)を設置したもの、である。断面Dが本実施の形態に相当する。
【0022】
表1における試験結果の欄は、仰角αが−3°、±0°、+3°の三種類の風それぞれに対するフラッタ発現風速を示している。
表1から分かるように、α=−3°、±0°の風に対しては、断面A〜Dはほとんど差がない。ところが、α=+3°の風に対しては、本発明の実施の形態である断面Dのフラッタ発現風速が最も大きいことが分かる。
【0023】
このように、この実施の形態における橋梁1は、仰角±3度の範囲の風の場合において、フラッター発現風速を大幅に高くすることができるのである。たとえば、中央支間2800m級の吊橋に対して、フラッター限界風速が約80m/s以上という実験結果が得られている。
しかも、断面Dの充実型防護柵(1.2m)は高さ1.2m程度であり、さほど利用者に閉塞感を与えることがない。
【0024】
次に、開口部4の開口ピッチと中央遮風壁の形状との関係を調べるための試験結果を表2に示す。
【0025】
【表2】
【0026】
表2においては、表1に示したA断面とD断面を比較の対象とし、A断面の開口ピッチを6mから3mの半分にしたものとしてE断面、D断面の開口ピッチを6mから3mの半分にしたものとしてF断面を示している。
【0027】
表2から分かるように、A断面からE断面にした場合、つまり開口ピッチを6mから3mに変更することでα=+3°の場合におけるフラッタ発現風速が78.5m/Sから55.6m/Sに減少している。このことから、A断面、E断面で用いた中央遮風壁では、開口ピッチの影響を強く受けていることが分かる。
【0028】
これに対して、D断面、F断面で用いた高さ1.2mの充実型の場合には、若干の低下はあるもののその影響はほとんどないと言える。
【0029】
このように、本実施の形態の中央遮風壁では中央開口部の影響をほとんど受けない。そして、この中央開口部の影響をほとんど受けない結果、設計の自由度が増し、合理的・経済的な設計が行える。
【0030】
以上のように、本実施の形態においては、
表1から分かるように、α=−3°、±0°の風に対しては、断面A〜Dはほとんど差がない。ところが、α=+3°の風に対しては、本発明の実施の形態である断面Dのフラッタ発現風速が最も大きいことが分かる。
【0031】
このように、この実施の形態における橋梁1は、利用者に閉塞感を与えることなく、仰角±3度の範囲の風の場合において、フラッター発現風速を大幅に高くすることができる。
また、中央開口部の開口ピッチの影響をほとんど受けることなくフラッター発現風速を高くすることができ、その結果、設計の自由度が増し、合理的・経済的な設計が行える。
【0032】
さらに、この実施の形態における橋梁1は、端部遮風壁7により、箱桁2の上面、すなわち、車線上の風速が低減されるので、車両の走行安全性が確保できるなどの効果もある。
さらにまた、中央中央遮風壁6が中央車両防護壁と兼用されるので、その分、構造が簡単となり、かつ、橋梁の材料が節約できる。
また、中央中央遮風壁6を充実壁構造部材としたので、対向車に対する遮光板としての機能も有することになり、この意味でも橋梁の材料が節約できる。
【0033】
この実施の形態における橋梁1は、風が箱桁の上・下面に再び付着するのを防止する第1従来例と比較して、広い開口部を必要としない。このために、開口部4が舗装を侵すようなことがなく、車線用の舗装が十分に確保することができる。すなわち、開口部4が中央分離帯部分のみに限定されているので、すべての車線で舗装を確保することが可能である。
また、箱桁の上面の風速を低減させる第2従来例と比較して、フラッター発現風速をより高くすることができ、耐フラッター性能に優れている。
【0034】
なお、中央遮風壁6の形状としては、図4(a)に示すような単なる板状でもよいし、図4(b)に示すように上端部に強度部材としての水平部材6aを設けたものでもよい。また、図4(c)に示すように地覆11の上に充実型の防護柵13を設置したものに、板状部材15を高さ補充部材として接合したものでもよいし、さらに図4(d)に示すように地覆11の上に板状部材17を設置したものでもよい。
【0035】
【発明の効果】
以上のように本発明においては、箱桁の中央分離帯部分に、開口部が連続的あるいは離散的に舗装部分を侵すことなく上下方向に開設されており、前記箱桁の両端上面には端部遮風壁が設置され、前記箱桁下面には検査車レールが敷設され、前記箱桁の中央上面には前記開口部への風導手段としての充実型壁構造部材が設けられており、前記充実壁構造部材は高さが1.2m以上であることから、利用者に閉塞感を与えることなく、仰角±3度の範囲の風の場合において、フラッター発現風速を大幅に高くすることができる。
また、中央開口部の開口ピッチの影響をほとんど受けることなくフラッター発現風速を高くすることができ、その結果、設計の自由度が増し、合理的・経済的な設計が行える。
【図面の簡単な説明】
【図1】本発明の一実施の形態の橋梁の一部斜視図である。
【図2】本発明の一実施の形態にかかる橋梁の橋軸直角方向の断面図に風の流れを線で示したものである。
【図3】本発明の一実施の形態において比較例として用いた中央構造物の説明図である。
【図4】本発明の一実施の形態における中央遮風壁の他の態様の説明図である。
【符号の説明】
1 橋梁
2 箱桁
4 開口部
6 中央遮風壁
7 端部遮風壁
8 検査車レール[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bridge such as a long suspension bridge or a cable-stayed bridge, and more particularly to a bridge having a high flutter expression wind speed and excellent flutter resistance performance.
[0002]
[Prior art]
For example, bridges such as long-sized suspension bridges and cable-stayed bridges have a low natural frequency of vertical bending and torsion, so that the wind speed at which divergent vibration called flutter (hereinafter, referred to as flutter onset wind speed) tends to be low. is there.
For this reason, as the cross-sectional shape of the bridge, a flat box-girder cross-sectional shape close to a flat blade having good dynamic aerodynamic characteristics is adopted. That is, the bridge has a box girder structure.
[0003]
However, even in the case of the bridge having a box girder structure having a flat box girder cross-sectional shape, when the natural frequency is extremely low, there is a problem that the flutter expression wind speed is still low. Thus, as a technique for increasing the fluttering wind speed, for example, there is a bridge described in Japanese Patent Publication No. 3-65444 (first conventional example) and a bridge described in Japanese Patent Application Laid-Open No. 11-280020 (second conventional example). .
[0004]
The bridge of the first conventional example is provided with a vertical opening at the center of a box girder, and a vertical drift plate extending from the upper surface of the box girder to the lower surface of the box girder through the center of the opening. It is.
In this bridge, on the windward side, the flow of the wind is deflected by the deflector plate, and on the leeward side, the wind is prevented from attaching to the upper and lower surfaces of the box girder, and the self-excited aerodynamic force is suppressed. , To increase the flutter expression wind speed.
[0005]
In the bridge of the second conventional example, a wind shield wall having a structure through which the wind passes is provided on the upper surface at the center of the box girder.
In this bridge, the wind speed on the upper surface of the box girder is reduced in a state where a part of the wind flow is passed through the wind shield wall, and the flutter manifestation wind speed is increased.
[0006]
However, the first and second conventional examples have the following problems. That is, in the first conventional example, since a relatively wide opening is required, pavement in a lane corresponding to the opening cannot be secured.
Further, in the second conventional example, the flutter developing wind speed can be increased to some extent, but it cannot be said that it is still high enough.
[0007]
As a solution to the problems of the first and second conventional examples, a bridge (third conventional example) described in the 55th Annual Scientific Meeting of the Japan Society of Civil Engineers Lecture Summary IB59 has been proposed.
This third conventional example is a bridge having a box girder structure, and an opening is continuously or discretely opened in a vertical direction without invading a pavement portion in a central divider band portion of the box girder, A central windshield and an end windshield as wind guide means to the opening are respectively provided on a central upper surface and both upper surfaces of the box girder, and an inspection vehicle rail is provided on a lower surface of the bridge girder. That is being done.
In the third conventional example, the flow pattern (upper and lower surfaces of the upper and lower surfaces) in which the vibration control effect of the central windshield and the central opening is emphasized by the separation interference effect of the girder end windshield wall and the girder bottom inspection car rail. (A flow pattern in which the flow approaches the cross section) to increase the flutter expression wind speed.
[0008]
[Problems to be solved by the invention]
However, the following problem still remains in the third conventional example.
That is, there is no clear suggestion as to what the central windbreak wall can most efficiently increase the flutter onset wind speed. Therefore, if the height of the central wind shield wall is increased from the viewpoint of increasing the flutter expression wind speed, the user will feel a blockage.
In addition, there was no suggestion as to what central windbreak wall would be optimal in relation to the central opening, and issues in this respect remained.
[0009]
The present invention has been made in order to solve such a problem, and has a sufficiently high flutter expression wind speed, excellent flutter resistance performance, and minimizes discomfort to a user, and the opening interval can be freely set. The purpose of the present invention is to provide a bridge that can be reasonably designed by being able to do so.
[0010]
[Means for Solving the Problems]
The bridge according to the present invention is a bridge having a box girder structure, and an opening is continuously or discretely opened in a median strip portion of the box girder without vertically invading a pavement portion. End windshields are installed on the upper surfaces of both ends of the girder, inspection car rails are laid on the lower surface of the box girder, and a solid wall structure member as a wind guide means to the opening is provided on the upper center of the box girder. The solid wall structural member is provided with a height of 1.2 m or more.
[0011]
By the wind guiding means, the wind flowing on the upper surface and / or the lower surface of the box girder is guided to the opening for venting and escapes to the lower surface and / or the upper surface of the box girder. For this reason, the pressure difference between the upper surface and the lower surface of the box girder is alleviated, the self-excited aerodynamic force acting on the box girder is reduced, and the flutter developing wind speed is increased.
[0012]
The height of the solid wall structural member may be 1.2 m, and by setting the height to 2 m or less, a wind resistance effect can be exhibited without causing a feeling of blocking of the user.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a bridge according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a part of a bridge according to
The
[0014]
A central portion of the
On the upper surface of the opening 4, a
The grating may be laid on the lower surface of the opening 4 so as to be substantially flush with the lower surface of the
[0015]
Further, the
The central wind shield wall 6 is provided continuously (or discretely) in the longitudinal direction of the
The reason why the height of the central wind shield wall 6 is set to 1.2 m will be described later.
[0016]
The
The upper surface of the
The
[0017]
FIG. 2 is a cross-sectional view of the bridge according to the present embodiment in a direction perpendicular to the bridge axis, in which the flow of wind is indicated by lines.
Hereinafter, the operation of the present embodiment will be described with reference to FIG.
First, due to the action of the center wind shield wall 6, the end
On the other hand, the wind (indicated by a solid arrow in FIG. 2) flowing on the lower surface of the
In this way, the above-mentioned wind flow is generated by the action of the central windshield 6, the
[0018]
In this embodiment, a solid wall structural member having a height of 1.2 m is used as the central wind shield 6, but the central wind shield 6 of the present embodiment will be compared with other examples. The operation will be described below.
Table 1 shows a comparison of wind resistance depending on the shape of the central wind shield wall.
[0019]
[Table 1]
[0020]
In Table 1, four types of bridge bridges A to D are shown. These four types of cross sections differ only in a central structure such as a central wind shield wall, and have other structures in common. As shown in FIG. 3, the type of the central structure is a normal type protective fence (see FIG. 3 (a)) having a height of 0.8 m and a solid wall structure having a height of 0.8 m. There are three types: a solid protective fence of 8 m (0.8 m) and a solid protective fence (1.2 m) with a height of 1.2 m consisting of a solid wall structure.
[0021]
The cross section A is shown as a third conventional example in the section of the prior art, in which a grid-like storm fence is provided on a normal type protective fence (FIG. 3A). The storm fence has the same structure as the
Section B is without a storm fence and a normal type fence (Fig. 3 (a)) is installed. Section C is without a storm fence and a solid type protection fence (0.8m) is installed. Section D is a storm fence. Without a solid protective fence (1.2 m). The cross section D corresponds to the present embodiment.
[0022]
The column of test results in Table 1 shows the flutter onset wind speed for each of the three types of winds of which the elevation angle α is −3 °, ± 0 °, and + 3 °.
As can be seen from Table 1, there is almost no difference between the sections A to D for winds of α = −3 ° and ± 0 °. However, it can be seen that, for a wind of α = + 3 °, the fluttering wind speed of the cross section D according to the embodiment of the present invention is the largest.
[0023]
As described above, the
Moreover, the solid protective fence (1.2 m) having the cross section D has a height of about 1.2 m, and does not give the user a feeling of obstruction.
[0024]
Next, Table 2 shows test results for examining the relationship between the opening pitch of the
[0025]
[Table 2]
[0026]
In Table 2, the section A and the section D shown in Table 1 are compared, and the opening pitch of the section A is reduced to half of 6 m to 3 m, and the opening pitch of the section E and D is reduced to half of 6 m to 3 m. The F cross section is shown as an example.
[0027]
As can be seen from Table 2, when the section A is changed from the section A to the section E, that is, when the opening pitch is changed from 6 m to 3 m, the flutter developing wind speed in the case of α = + 3 ° is from 78.5 m / S to 55.6 m / S. Has decreased. From this, it is understood that the central windshield used in the A section and the E section is strongly affected by the opening pitch.
[0028]
On the other hand, in the case of the solid type having a height of 1.2 m used in the D section and the F section, it can be said that there is little influence, though there is a slight decrease.
[0029]
Thus, the central windshield of the present embodiment is hardly affected by the central opening. Then, as a result of being hardly affected by the central opening, the degree of freedom in design is increased, and rational and economical design can be performed.
[0030]
As described above, in the present embodiment,
As can be seen from Table 1, there is almost no difference between the sections A to D for winds of α = −3 ° and ± 0 °. However, it can be seen that, for a wind of α = + 3 °, the fluttering wind speed of the cross section D according to the embodiment of the present invention is the largest.
[0031]
As described above, the
Further, the wind speed of flutter can be increased without being substantially affected by the opening pitch of the central opening. As a result, the degree of freedom of design increases, and a rational and economical design can be performed.
[0032]
Furthermore, the
Further, since the central central wind shield wall 6 is also used as the central vehicle protective wall, the structure is simplified and the material of the bridge can be saved.
In addition, since the central central wind shield wall 6 is a solid wall structural member, it also has a function as a light shielding plate for oncoming vehicles, and in this sense, the material of the bridge can be saved.
[0033]
The
Further, compared to the second conventional example in which the wind speed on the upper surface of the box girder is reduced, the flutter expression wind speed can be increased, and the flutter resistance performance is excellent.
[0034]
The shape of the central wind shield wall 6 may be a simple plate shape as shown in FIG. 4A, or a
[0035]
【The invention's effect】
As described above, in the present invention, an opening is continuously or discretely opened in the central divider part of the box girder without invading the pavement part, and the upper end of the box girder is provided with an end. A part of the box girder is installed, an inspection car rail is laid on the lower surface of the box girder, and a solid wall structure member as a wind guiding means to the opening is provided on a central upper surface of the box girder, Since the solid wall structural member has a height of 1.2 m or more, it is possible to greatly increase the flutter expression wind speed in the case of a wind in an elevation angle of ± 3 degrees without giving the user a feeling of obstruction. it can.
Further, the flutter expression wind speed can be increased without being substantially affected by the opening pitch of the central opening. As a result, the degree of freedom of design increases, and a rational and economical design can be performed.
[Brief description of the drawings]
FIG. 1 is a partial perspective view of a bridge according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a bridge according to an embodiment of the present invention, taken along a line perpendicular to the bridge axis, showing the flow of wind by lines.
FIG. 3 is an explanatory diagram of a central structure used as a comparative example in one embodiment of the present invention.
FIG. 4 is an explanatory diagram of another mode of the central windshield in one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002196195A JP3663544B2 (en) | 2002-07-04 | 2002-07-04 | Bridge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002196195A JP3663544B2 (en) | 2002-07-04 | 2002-07-04 | Bridge |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2004036271A true JP2004036271A (en) | 2004-02-05 |
JP3663544B2 JP3663544B2 (en) | 2005-06-22 |
Family
ID=31704356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2002196195A Expired - Lifetime JP3663544B2 (en) | 2002-07-04 | 2002-07-04 | Bridge |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3663544B2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005121456A1 (en) * | 2004-06-09 | 2005-12-22 | Incorporated Administrative Agency Public Works Research Institute | Cable stayed suspension bridge making combined use of one-box and two-box girders |
JP2010065512A (en) * | 2008-09-12 | 2010-03-25 | Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co Ltd | Bridge, and construction method of the same |
CN107059591A (en) * | 2017-04-27 | 2017-08-18 | 西南交通大学 | A kind of plate girder Combined steel truss beam bridge flutter vibration suppression construction |
CN108842599A (en) * | 2018-07-16 | 2018-11-20 | 同济大学 | One kind being based on bionic pneumatic drag reduction device and bridge |
CN108894348A (en) * | 2018-07-16 | 2018-11-27 | 同济大学 | One kind being based on bionic modularization pneumatic drag reduction device and skyscraper |
CN111441234A (en) * | 2020-03-27 | 2020-07-24 | 中南大学 | Deformable air nozzle for inhibiting wind-induced vibration of bridge |
CN112064488A (en) * | 2020-07-20 | 2020-12-11 | 深圳大学 | Pneumatic adjusting structure for bridge vortex vibration |
CN114369995A (en) * | 2022-02-21 | 2022-04-19 | 中南大学 | Flexible vortex generator for inhibiting bridge vortex vibration |
-
2002
- 2002-07-04 JP JP2002196195A patent/JP3663544B2/en not_active Expired - Lifetime
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005121456A1 (en) * | 2004-06-09 | 2005-12-22 | Incorporated Administrative Agency Public Works Research Institute | Cable stayed suspension bridge making combined use of one-box and two-box girders |
US7743444B2 (en) | 2004-06-09 | 2010-06-29 | Incorporated Administrative Agency Public Works Research Institute | Cable stayed suspension bridge making combined use of one-box and two-box girders |
JP2010065512A (en) * | 2008-09-12 | 2010-03-25 | Mitsubishi Heavy Industries Bridge & Steel Structures Engineering Co Ltd | Bridge, and construction method of the same |
CN107059591A (en) * | 2017-04-27 | 2017-08-18 | 西南交通大学 | A kind of plate girder Combined steel truss beam bridge flutter vibration suppression construction |
CN108842599B (en) * | 2018-07-16 | 2019-10-01 | 同济大学 | One kind being based on bionic pneumatic drag reduction device and bridge |
CN108894348A (en) * | 2018-07-16 | 2018-11-27 | 同济大学 | One kind being based on bionic modularization pneumatic drag reduction device and skyscraper |
CN108842599A (en) * | 2018-07-16 | 2018-11-20 | 同济大学 | One kind being based on bionic pneumatic drag reduction device and bridge |
CN108894348B (en) * | 2018-07-16 | 2020-05-08 | 同济大学 | Modularized pneumatic resistance reducing device based on bionics and high-rise building |
CN111441234A (en) * | 2020-03-27 | 2020-07-24 | 中南大学 | Deformable air nozzle for inhibiting wind-induced vibration of bridge |
CN111441234B (en) * | 2020-03-27 | 2021-04-20 | 中南大学 | Deformable air nozzle for inhibiting wind-induced vibration of bridge |
CN112064488A (en) * | 2020-07-20 | 2020-12-11 | 深圳大学 | Pneumatic adjusting structure for bridge vortex vibration |
CN114369995A (en) * | 2022-02-21 | 2022-04-19 | 中南大学 | Flexible vortex generator for inhibiting bridge vortex vibration |
CN114369995B (en) * | 2022-02-21 | 2022-11-04 | 中南大学 | Flexible vortex generator for inhibiting bridge vortex vibration |
WO2023155922A1 (en) * | 2022-02-21 | 2023-08-24 | 中南大学 | Flexible vortex generator for inhibiting vortex-induced vibration of bridges |
Also Published As
Publication number | Publication date |
---|---|
JP3663544B2 (en) | 2005-06-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0586245B2 (en) | Wind deflector for vehicle sunroof | |
CN108463398A (en) | The aerodynamics deflector of wheel for motor vehicles | |
JP2004036271A (en) | Bridge | |
JP2002266315A (en) | Bridge | |
JPH0796763B2 (en) | Suspension bridge structure with flutter measures | |
KR101128216B1 (en) | wind proofing device | |
US9586464B2 (en) | Vehicle sunroof wind deflector | |
JP3697055B2 (en) | Bridge | |
KR101926064B1 (en) | Wind and noise reduction structure | |
JP4296981B2 (en) | Windbreak fence | |
JP3655856B2 (en) | Soundproofing device and soundproofing wall equipped with soundproofing device | |
JPH1171720A (en) | Bridge | |
JP2005307432A (en) | Windbreak fence | |
JP3615933B2 (en) | Windshield | |
KR20190063030A (en) | Wind deflector for a road partition | |
KR200431158Y1 (en) | bridge's parapet | |
CN218291554U (en) | Windproof and vibration-damping device for straight web steel box bridge | |
CN212742170U (en) | Bridge tuyere structure of non-motor vehicle capable of passing through inside | |
JP7175663B2 (en) | Wind reduction panel and method for designing wind reduction panel | |
JP3346132B2 (en) | How to prevent bridge gutter flutter | |
KR200320576Y1 (en) | A waterway for mountain rod | |
JP2005290911A (en) | Snow protection fence | |
JP5672271B2 (en) | Rear spoiler | |
JPS6138970Y2 (en) | ||
JP2760196B2 (en) | Movable damping device for bridge-like structures |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040915 |
|
A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040921 |
|
A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20041116 |
|
TRDD | Decision of grant or rejection written | ||
A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050308 |
|
A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050316 |
|
R150 | Certificate of patent or registration of utility model |
Ref document number: 3663544 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080408 Year of fee payment: 3 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080408 Year of fee payment: 3 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080408 Year of fee payment: 3 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080408 Year of fee payment: 3 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080408 Year of fee payment: 3 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080408 Year of fee payment: 3 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090408 Year of fee payment: 4 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090408 Year of fee payment: 4 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090408 Year of fee payment: 4 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100408 Year of fee payment: 5 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100408 Year of fee payment: 5 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100408 Year of fee payment: 5 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100408 Year of fee payment: 5 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313117 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110408 Year of fee payment: 6 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110408 Year of fee payment: 6 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110408 Year of fee payment: 6 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120408 Year of fee payment: 7 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130408 Year of fee payment: 8 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140408 Year of fee payment: 9 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313115 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
EXPY | Cancellation because of completion of term | ||
R370 | Written measure of declining of transfer procedure |
Free format text: JAPANESE INTERMEDIATE CODE: R370 |
|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |