JP3377602B2 - Stiffening girder of long bridge - Google Patents

Stiffening girder of long bridge

Info

Publication number
JP3377602B2
JP3377602B2 JP15468694A JP15468694A JP3377602B2 JP 3377602 B2 JP3377602 B2 JP 3377602B2 JP 15468694 A JP15468694 A JP 15468694A JP 15468694 A JP15468694 A JP 15468694A JP 3377602 B2 JP3377602 B2 JP 3377602B2
Authority
JP
Japan
Prior art keywords
girder
stiffening girder
stiffening
width
sidewalk
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.)
Expired - Fee Related
Application number
JP15468694A
Other languages
Japanese (ja)
Other versions
JPH0820911A (en
Inventor
滋登 平井
明弘 本田
勝彦 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP15468694A priority Critical patent/JP3377602B2/en
Publication of JPH0820911A publication Critical patent/JPH0820911A/en
Application granted granted Critical
Publication of JP3377602B2 publication Critical patent/JP3377602B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】 【0001】 【産業上の利用分野】本発明は、吊橋、斜張橋などの長
大橋の補剛桁に関するものである。 【0002】 【従来の技術】従来の長大橋の補剛桁を図4により説明
すると、010が補剛桁、01が強度メンバーとしての
箱桁、02が箱桁01の両側端に取付けたフエアリング
で、このフエアリング02は、箱桁01の両側端の風の
抵抗を軽減するために取付けられている。 【0003】04が両側のメーンケーブル、03が同各
メーンケーブル04から垂下したワイヤーで、箱桁01
の両側端部が同各ワイヤー03により吊り下げ支持され
ている。06、06が上記箱桁01の上面の両側部に取
付けたフエンス、07、07が上記箱桁01の上面に取
付けたガードレールで、同各ガードレール07の間の箱
桁01上面が車道スペース08になり、各ガードレール
07とフエンス06との間の箱桁01上面が歩道スペー
ス09になっている。 【0004】図5は、上記各部分の巾を示しており、B
00が箱桁01の巾、B10が車道スペース08の巾、
B20が両側の歩道スペース09の巾、B30がタワー
(図示せず)との関係から道路として使用できない部分
の巾で、箱桁01の巾B00は、上記各部分の巾B10
+B20+B30であり、補剛桁010の巾としては、
その両側にフエアリング02の巾B40が加わる。 【0005】図6は、上記各部分の高さを示しており、
H00が箱桁01上面からのガードレール07の高さ、
H20が箱桁01上面からのフエンス06の高さであ
る。なお図4〜図6は、吊橋の補剛桁010の例を示し
ているが、補剛桁010の構成は、斜張橋の場合も同様
である。 【0006】 【発明が解決しようとする課題】前記図4、図5に示す
従来の長大橋の補剛桁には、次の問題があった。即ち、
図6は、横風が吹く場合の補剛桁010周りの風の流れ
を示している。フエンス06は、歩行者の落下防止だけ
でなく、様々な品物の落下を防止して、橋の下を通過す
る船舶まはた車両の安全を確保するために設置されてお
り、比較的目の詰まったネット状のものを使用してい
る。 【0007】そのため、風の抵抗が大きく、補剛桁01
0の上面の気流011は、図に示すようにフエンス06
を超える流れになって、補剛桁010から大きく剥がれ
る。一方、補剛桁010の下面の気流012は、フエア
リング02の効果で比較的補剛桁010に沿って流れる
ため、補剛桁010には、上下方向に大きな変動空気力
が作用して、動的耐風性が悪化するという問題があっ
た。 【0008】本発明は前記の問題点に鑑み提案するもの
であり、その目的とする処は、動的耐風性を向上で
き、重量を軽減できる長大橋の補剛桁を提供しようと
する点にある。 【0009】 【課題を解決するための手段】上記の目的を達成するた
め、本発明は、両側端にフェアリングを具えた長大橋の
補剛桁において、前記フェアリングは下方へ向かう傾斜
面を有し、該下方へ向かう傾斜面よりさらに下方へ凹ん
だ凹部に歩道を設け、該歩道として利用される面を前記
傾斜面より下方とした。 【0010】 【作用】本発明の長大橋の補剛桁は前記のように凹部
(歩道スペース)をフエアリングに設けて、凹部(歩道
スペース)を車道スペースから一段下げており、フエン
スの箱桁上面からの高さが従来のH20(図6参照)か
らH1(図3参照)に減少するので、補剛桁の上面の気
流の剥がれが小さくなる。このため、補剛桁に作用する
上下方向の変動空気力が軽減して、動的耐風性が大幅に
向上する。また凹部(歩道スペース)が補剛桁の強度メ
ンバーとしての箱桁から無くなった関係上、補剛桁全体
の幅には大差がないものの、箱桁の幅B0が従来のB0
0よりも大幅に減少しており、その分だけ補剛桁の重量
が軽減する。 【0011】 【実施例】次に本発明の長大橋の補剛桁を図1〜図3に
示す一実施例により説明すると、図1の1が補剛桁10
の箱桁(強度メンバー)、2が箱桁1の両側端の風の抵
抗を軽減するために箱桁1の両側端に取付けたフエアリ
ングである。4が両側のメーンケーブル、3が同各メー
ンケーブル4から垂下したワイヤーで、箱桁1の両側端
部が同各ワイヤー3により吊り下げ支持されている。 【0012】7、7が上記箱桁1の上面に取付けたガー
ドレールで、同各ガードレール7の間の箱桁1上面が車
道スペース8になっている。9、9が上記各フエアリン
グ2に設けた凹部で、この凹部が歩道スペースになって
おり、この凹部(歩道スペース)9は、上記車道スペー
ス8に比べて一段下がっている。6、6が上記凹部(歩
道スペース)9の外側壁面部から上方に突出したフエン
スで、同各フエンス6は、歩道レベルが下がった分だけ
その高さが低くなっている。 【0013】図2は、上記各部分の巾を示しており、B
0が箱桁1の巾、B1が車道スペース8の巾、B2が両
側の凹部(歩道スペース)9の巾、B3がタワー(図示
せず)との関係から道路として使用できない部分の巾
で、箱桁1の巾B0は、上記各部分の巾B1+B3であ
り、補剛桁の巾としては、その両側にフエアリング02
の巾B2+B4が加わる。 【0014】図3は、上記各部分の高さを示しており、
H0が箱桁1上面からのガードレール7の高さ、H1が
箱桁1上面からのフエンス6の高さ、H2が凹部(歩道
スペース)9底面からのフエンス6の高さである。次に
前記図1〜図3に示す長大橋の補剛桁の作用を具体的に
説明する。凹部(歩道スペース)9をフエアリング2に
設けて、凹部(歩道スペース)9を車道スペース8から
一段下げており、フエンス6の箱桁1上面からの高さが
従来のH20(図6参照)からH1(図3参照)に減少
するので、補剛桁10の上面の気流11の剥がれが小さ
くなる。このため、補剛桁10に作用する上下方向の変
動空気力が軽減して、動的耐風性が大幅に向上する。 【0015】また凹部(歩道スペース)9が補剛桁10
の強度メンバーとしての箱桁1から無くなった関係上、
補剛桁10全体の幅には大差がないものの、箱桁1の幅
B0が従来のB00よりも大幅に減少しており、その分
だけ補剛桁10の重量が軽減している。なおガードレー
ル7の高さは、従来と同様にH0であるが、H20に比
べ小さく、かつ補剛桁10の内側寄りに位置するので、
フエンス6ほどには問題にならない。 【0016】 【発明の効果】本発明の長大橋の補剛桁は前記のように
凹部(歩道スペース)をフエアリングに設けて、凹部
(歩道スペース)を車道スペースから一段下げており、
フエンスの箱桁上面からの高さが従来のH20(図6参
照)からH1(図3参照)に減少するので、補剛桁の上
面の気流の剥がれが小さくなる。このため、補剛桁に作
用する上下方向の変動空気力を軽減できて、動的耐風性
を大幅に向上できる。 【0017】また凹部(歩道スペース)が補剛桁の強度
メンバーとしての箱桁から無くなった関係上、補剛桁全
体の幅には大差がないものの、箱桁の幅B0が従来のB
00よりも大幅に減少しており、その分だけ補剛桁の重
量を軽減できる。
Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stiffening girder for a long bridge such as a suspension bridge or a cable-stayed bridge. 2. Description of the Related Art A conventional stiffening girder of a long bridge will be described with reference to FIG. 4. Reference numeral 010 denotes a stiffening girder, 01 denotes a box girder as a strength member, and 02 denotes a floor ring attached to both ends of the box girder 01. The floor ring 02 is attached to reduce the wind resistance at both ends of the box girder 01. [0004] Reference numeral 04 denotes a main cable on both sides, reference numeral 03 denotes a wire hanging down from each main cable 04, and a box girder 01.
Are suspended and supported by the respective wires 03. Reference numerals 06 and 06 denote fences mounted on both sides of the upper surface of the box girder 01, 07 and 07 denote guard rails mounted on the upper surface of the box girder 01, and the upper surface of the box girder 01 between the guard rails 07 and the road space 08. The upper surface of the box girder 01 between each guardrail 07 and the fence 06 is a sidewalk space 09. FIG. 5 shows the width of each of the above parts.
00 is the width of box girder 01, B10 is the width of roadway space 08,
B20 is the width of the sidewalk space 09 on both sides, B30 is the width of the part that cannot be used as a road due to the relationship with the tower (not shown), and the width B00 of the box girder 01 is the width B10 of each of the above parts.
+ B20 + B30, and the width of the stiffening girder 010 is:
The width B40 of the fairing 02 is added to both sides thereof. FIG. 6 shows the height of each part described above.
H00 is the height of guardrail 07 from the top of box girder 01,
H20 is the height of the fence 06 from the upper surface of the box girder 01. 4 to 6 show an example of the stiffening girder 010 of the suspension bridge, but the configuration of the stiffening girder 010 is the same in the case of the cable-stayed bridge. The stiffening girder of the conventional long bridge shown in FIGS. 4 and 5 has the following problems. That is,
FIG. 6 shows the flow of the wind around the stiffening girder 010 when a cross wind blows. Fuens 06 is installed not only to prevent pedestrians from falling, but also to prevent the falling of various items and to ensure the safety of ships or vehicles passing under the bridge. Uses a clogged net. Therefore, the wind resistance is large, and the stiffening girder 01
The airflow 011 on the upper surface of the fuence 06 is shown in FIG.
, And largely separate from the stiffening girder 010. On the other hand, the airflow 012 on the lower surface of the stiffening girder 010 relatively flows along the stiffening girder 010 due to the effect of the flooring 02. There is a problem that the wind resistance deteriorates. The present invention has been made in view of the above problems, and an object thereof is to provide a stiffening girder for a long bridge capable of improving dynamic wind resistance and reducing weight. is there. In order to achieve the above object, the present invention provides a stiffening girder for a long bridge having fairings on both ends, wherein the fairings are inclined downward.
Surface and is recessed further below the downwardly inclined surface.
A sidewalk is provided in the recess, and the surface used as the sidewalk is
It was below the slope. The stiffening girder of the long bridge according to the present invention has the recess (sidewalk space) provided in the fairing as described above, and the recess (sidewalk space) is lowered by one step from the roadway space. From the conventional H20 (see FIG. 6) to H1 (see FIG. 3), so that the separation of the airflow on the upper surface of the stiffening girder is reduced. For this reason, the vertical aerodynamic force acting on the stiffening girder is reduced, and the dynamic wind resistance is greatly improved. Further, since the recess (sidewalk space) has been removed from the box girder as a strength member of the stiffening girder, the width of the box girder is the same as the conventional B0, although there is no great difference in the width of the entire stiffening girder.
It is greatly reduced from zero, and the weight of the stiffening girder is reduced accordingly. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stiffening girder of a long bridge according to the present invention will be described with reference to an embodiment shown in FIGS.
The box girder (strength member) 2 is a floor ring attached to both ends of the box girder 1 in order to reduce wind resistance on both sides of the box girder 1. 4 is a main cable on both sides, 3 is a wire hanging down from each main cable 4, and both ends of the box girder 1 are suspended and supported by the respective wires 3. Reference numerals 7, 7 denote guard rails mounted on the upper surface of the box girder 1, and the upper surface of the box girder 1 between the guard rails 7 forms a roadway space 8. Depressions 9 and 9 are provided in the respective floor rings 2, and these depressions are sidewalk spaces. The depressions (sidewalk spaces) 9 are one step lower than the roadway spaces 8. Numerals 6 and 6 denote fuences projecting upward from the outer wall surface of the concave portion (sidewalk space) 9, and the height of each of the fluences 6 is reduced by the lowering of the sidewalk level. FIG. 2 shows the width of each of the above parts.
0 is the width of the box girder 1, B1 is the width of the roadway space 8, B2 is the width of the recess (sidewalk space) 9 on both sides, B3 is the width of the part that cannot be used as a road due to the relationship with the tower (not shown), The width B0 of the box girder 1 is the width B1 + B3 of each of the above-mentioned portions.
Of width B2 + B4. FIG. 3 shows the height of each part described above.
H0 is the height of the guard rail 7 from the top of the box girder 1, H1 is the height of the fence 6 from the top of the box girder 1, and H2 is the height of the fence 6 from the bottom of the recess (sidewalk space) 9. Next, the operation of the stiffening girder of the long bridge shown in FIGS. 1 to 3 will be specifically described. A recess (sidewalk space) 9 is provided in the flooring 2, and the recess (sidewalk space) 9 is lowered one step from the roadway space 8. The height of the fence 6 from the upper surface of the box girder 1 is higher than that of the conventional H20 (see FIG. 6). Since H1 (see FIG. 3) is reduced, peeling of the airflow 11 on the upper surface of the stiffening girder 10 is reduced. For this reason, the variable air force acting on the stiffening girder 10 in the vertical direction is reduced, and the dynamic wind resistance is greatly improved. The recess (sidewalk space) 9 has a stiffening girder 10
Due to the loss of box girder 1 as a strength member of
Although there is no great difference in the width of the entire stiffening girder 10, the width B0 of the box girder 1 is significantly reduced as compared with the conventional B00, and the weight of the stiffening girder 10 is correspondingly reduced. The height of the guardrail 7 is H0 as in the prior art, but is smaller than H20 and is located closer to the inside of the stiffening girder 10, so that
It doesn't matter as much as Fuens 6. As described above, the stiffening girder of the long bridge according to the present invention has the recess (sidewalk space) provided in the flooring and the recess (sidewalk space) is lowered by one step from the roadway space.
Since the height of the fuence from the upper surface of the box girder is reduced from the conventional H20 (see FIG. 6) to H1 (see FIG. 3), the separation of the airflow on the upper surface of the stiffening girder is reduced. For this reason, the vertical aerodynamic force acting on the stiffening girder can be reduced, and the dynamic wind resistance can be greatly improved. Also, since the recess (sidewalk space) has been removed from the box girder as a strength member of the stiffening girder, there is no great difference in the width of the entire stiffening girder.
Since it is much smaller than 00, the weight of the stiffening girder can be reduced accordingly.

【図面の簡単な説明】 【図1】本発明の長大橋の補剛桁の一実施例を示す縦断
正面図である。 【図2】同補剛桁の各部分の巾を示す説明図である。 【図3】同補剛桁の各部分の高さ及び作用を示す説明図
である。 【図4】従来の長大橋の補剛桁の一実施例を示す縦断正
面図である。 【図5】同補剛桁の各部分の巾を示す説明図である。 【図6】同補剛桁の各部分の高さ及び作用を示す説明図
である。 【符号の説明】 1 箱桁(強度メンバー) 2 フエアリング 3 ワイヤー 4 メーンケーブル 6 フエンス 7 ガードレール 8 車道スペース 9 凹部(歩道スペース) 10 補剛桁
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional front view showing an embodiment of a stiffening girder of a long bridge according to the present invention. FIG. 2 is an explanatory view showing the width of each part of the stiffening girder. FIG. 3 is an explanatory view showing the height and operation of each part of the stiffening girder. FIG. 4 is a longitudinal sectional front view showing an example of a conventional stiffening girder of a long bridge. FIG. 5 is an explanatory view showing the width of each part of the stiffening girder. FIG. 6 is an explanatory view showing the height and operation of each part of the stiffening girder. [Description of Signs] 1 Box girder (strength member) 2 Fairing 3 Wire 4 Main cable 6 Fuence 7 Guardrail 8 Roadway space 9 Depression (sidewalk space) 10 Stiffening girder

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特公 昭43−10662(JP,B1) 実公 昭47−14360(JP,Y1) (58)調査した分野(Int.Cl.7,DB名) E01D 11/00 - 11/04 E01D 1/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Patent Publication No. 43-10662 (JP, B1) Japanese Utility Model Publication No. 47-14360 (JP, Y1) (58) Field surveyed (Int. Cl. 7 , DB name) E01D 11/00-11/04 E01D 1/00

Claims (1)

(57)【特許請求の範囲】 【請求項1】 両側端にフェアリングを具えた長大橋の
補剛桁において、前記フェアリングは下方へ向かう傾斜
面を有し、該下方へ向かう傾斜面よりさらに下方へ凹ん
だ凹部に歩道を設け、該歩道として利用される面は前記
傾斜面より下方であることを特徴とする長大橋の補剛
桁。
(57) [Claims 1] In a stiffening girder of a long bridge having fairings on both sides, the fairings are inclined downward.
Surface and is recessed further below the downwardly inclined surface.
A sidewalk is provided in the recess, and the surface used as the sidewalk is
A stiffening girder for a long bridge, which is below the slope .
JP15468694A 1994-07-06 1994-07-06 Stiffening girder of long bridge Expired - Fee Related JP3377602B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15468694A JP3377602B2 (en) 1994-07-06 1994-07-06 Stiffening girder of long bridge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15468694A JP3377602B2 (en) 1994-07-06 1994-07-06 Stiffening girder of long bridge

Publications (2)

Publication Number Publication Date
JPH0820911A JPH0820911A (en) 1996-01-23
JP3377602B2 true JP3377602B2 (en) 2003-02-17

Family

ID=15589712

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15468694A Expired - Fee Related JP3377602B2 (en) 1994-07-06 1994-07-06 Stiffening girder of long bridge

Country Status (1)

Country Link
JP (1) JP3377602B2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101139813B (en) * 2007-08-31 2011-11-16 西南交通大学 Steel truss of through bridge
JP5357557B2 (en) * 2009-02-05 2013-12-04 株式会社Ihi Parallel bridge
KR102281533B1 (en) * 2021-03-09 2021-07-26 (주)신흥이앤지 Rocking bridge with experience facility in both sides and method for constructing this same
KR102257655B1 (en) * 2021-03-22 2021-05-28 (주)신흥이앤지 Girder structure with experience facility and method for constructing this same
CN113718619A (en) * 2021-08-09 2021-11-30 天津市政工程设计研究总院有限公司 Suspension type bridge of people's bank of china system of walking slowly

Also Published As

Publication number Publication date
JPH0820911A (en) 1996-01-23

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