JPS6334243B2 - - Google Patents

Description

【発明の詳細な説明】 本発明は、風光明媚な地域に建設されることが
多い長大吊橋、斜張橋などの長大橋において、平
常時は橋面上を通行する者の視野を妨げることな
く、通常の自動車防護柵の役目を果たし、台風襲
来時等空力不安定現象の発生が予想される緊急時
に橋の破壊を未然に防ぐため、耐風性を向上させ
ることのできる耐風安全性保持機能を有する自動
車防護柵を設置した橋梁を提供するものである。[Detailed Description of the Invention] The present invention can be used in long bridges such as long suspension bridges and cable-stayed bridges, which are often constructed in scenic areas, without obstructing the view of people passing on the bridge surface during normal times. The bridge functions as a regular vehicle protection fence, and has a wind-resistant safety function that improves wind resistance in order to prevent the bridge from being destroyed in emergencies where aerodynamic instability is expected, such as when a typhoon hits. The present invention provides a bridge equipped with a vehicle protection fence.

トラス構造の補剛桁を有する長大橋が風洞実験
の結果、設計上の限界風速以下で空力不安定現象
を生じることが明らかになつた場合、その耐風安
全性を確保するための方策として一般につぎの３
つがある。 If a wind tunnel test reveals that a long bridge with a truss structure stiffening girder will experience aerodynamic instability below the design critical wind speed, the following measures are generally taken to ensure its wind resistance: No. 3
There is one.

補剛桁自身の曲げ剛性、ねじれ剛性を大きく
し、かつ橋全体のねじれ振動数と曲げ振動数の比
を大きくする。橋梁全体の減衰性能を大きくす
る。補剛桁の断面形状を変化させ空力特性を改
善する。このうち、の方策を実現するために
は相当な困難を伴うことが多い。一方、の形状
変化の方策は、比較的簡便であるが、十分な耐風
性を確保するには、多くの風洞実験を試行錯誤的
に行なう必要がある。これに対し、路面上に長
手方向に沿つて有効高さの偏流壁を設置すること
により、風荷重の増加を極力抑えて空力安定現象
の発生する風速を大幅に増大させることが試みら
れている。すなわち、風荷重によつて補剛桁が上
下方向に波打つことを上記偏流壁によつて抑制で
きる。しかし、このような偏流壁を路面上に設け
ると、通行者の視野を妨げる問題がある。 Increase the bending and torsional rigidity of the stiffening girder itself, and increase the ratio of the torsional and bending frequencies of the entire bridge. Increase the damping performance of the entire bridge. Improve aerodynamic characteristics by changing the cross-sectional shape of the stiffening girder. Of these, implementing these measures often involves considerable difficulty. On the other hand, the method for changing the shape is relatively simple, but in order to ensure sufficient wind resistance, it is necessary to conduct many wind tunnel experiments by trial and error. In response, attempts have been made to minimize the increase in wind load and significantly increase the wind speed at which the aerodynamic stability phenomenon occurs by installing drift walls of effective height along the longitudinal direction of the road surface. . That is, the deflection wall can suppress vertical undulation of the stiffening girder due to wind loads. However, when such a drift wall is provided on the road surface, there is a problem that it obstructs the view of passersby.

本発明は上記偏流壁としての機能を有しながら
通常時は視野を妨げない自動車防護柵としての利
用に供せるように図つたものであり、以下その実
施例を図面に基づいて説明する。 The present invention is designed to be used as a protection fence for automobiles that does not obstruct the field of vision during normal operation while having the function of the drift wall described above.Examples of the present invention will be described below with reference to the drawings.

第１図において、１は長大吊橋のトラス構造の
補剛桁、２は補剛桁１上に設けられ路面を構成す
る床であり、路面の中央、すなわち中央分離帯部
分に、長さ方向に沿つて自動車防護柵３が設けら
れる。 In Fig. 1, 1 is the stiffening girder of the truss structure of a long suspension bridge, and 2 is the floor that is installed on the stiffening girder 1 and forms the road surface. A car protection fence 3 is provided along the line.

第２図、第３図は自動車防護柵３をアコーデイ
オンカーテン式に構成した例を示す。同図におい
て、４は支持枠体であり、路面の長さ方向に沿つ
て基台５に立設される。支持枠体４は一列に適当
間隔おきに立設された支柱６と、各支柱６の上端
間にわたつて固定された２本の平行な上縁材７
と、支柱６の中間高さ位置で各支柱６間に固定さ
れた補強材８からなり、各支柱６間で構成される
区画Ｍごとに遮閉体としてカーテン９が設けられ
る。カーテン９は多数の細い縦長の単位板９ａを
折曲自在に連結したものであり、支持枠体４の上
下部に設けられた２本の索材１０ａ，１０ｂに、
各単位板９ａごとにガイド環１１を介して係合支
持される。索材１０ａ，１０ｂは進退可能に支持
してある。カーテン９の幅方向一端は支持枠体４
に固定し、他端は索材１０ａ，１０ｂに接続して
あり、索材１０ａ，１０ｂを進退させることによ
り、各区画Ｍのカーテン９を第２図Ａ，Ｂのよう
に各区画Ｍの一端に寄せる状態と、第３図Ａ，Ｂ
のように広げる状態とに操作できる。すなわち、
カーテン９によつて支持枠体４の両側間を遮閉し
ない状態と、各区画Ｍにつらなつて遮閉する状態
とに操作できる。 FIGS. 2 and 3 show an example in which the automobile protection fence 3 is configured in an accordion curtain type. In the figure, reference numeral 4 denotes a support frame, which is erected on the base 5 along the length direction of the road surface. The support frame 4 includes columns 6 erected in a row at appropriate intervals, and two parallel upper edge members 7 fixed across the upper ends of each column 6.
and a reinforcing member 8 fixed between each column 6 at an intermediate height position of each column 6, and a curtain 9 is provided as a shield for each section M formed between each column 6. The curtain 9 is made up of a large number of thin vertically elongated unit plates 9a connected together in a bendable manner.
Each unit plate 9a is engaged and supported via a guide ring 11. The cable members 10a and 10b are supported so as to be movable. One end of the curtain 9 in the width direction is supported by the support frame 4
The other end is connected to the cable members 10a and 10b, and by moving the cable members 10a and 10b back and forth, the curtain 9 of each section M can be fixed at one end of each section M as shown in FIGS. 2A and B. Figure 3 A, B
It can be operated in the expanded state as shown in the figure. That is,
The curtain 9 can be operated in a state in which both sides of the support frame body 4 are not blocked and in a state in which it is extended to each section M to be closed and closed.

第４図および第５図は自動車防護柵３をジヤバ
ラ式に構成した例を示す。支持枠体４は長さ方向
適当間隔おきの位置で２本づつ平行に立設した支
柱６と、上縁材７と、補強材８からなり、各支柱
６間で構成される区画Ｍごとに、上下に膨縮可能
なジヤバラ状の袋体１２が設けられる。袋体１２
は遮閉体をなすものである。各袋体１２は圧縮空
気の供給手段に接続されており、常時は第４図
Ａ，Ｂのように下部に縮んだ状態に配置され、圧
縮空気を注入することにより、第５図Ａ，Ｂのよ
うに支持枠体４の上端まで広げられる。１３ａ，
１３ｂは支持枠体４の長さ方向に沿つて設けた２
本の索材であり、各袋体１２の上端が索材１３
ａ，１３ｂに接続されている。各支柱６の上端に
索材１３ａ，１３ｂを固定する固定爪１４が設け
られており、袋体１２の膨張時において、索材１
３ａ，１３ｂを固定爪１４に固定することによ
り、強風に対する袋体１２の保持がなされる。こ
のように、袋体１２の膨縮によつて遮閉状態と非
遮閉状態とに操作される。 FIGS. 4 and 5 show an example in which the automobile protection fence 3 is configured in a bellows style. The support frame 4 consists of two pillars 6 erected in parallel at appropriate intervals in the length direction, an upper edge material 7, and a reinforcing material 8, and each section M formed between each pillar 6 is A bellows-shaped bag body 12 that can be expanded and contracted up and down is provided. Bag body 12
is a blocker. Each bag 12 is connected to a compressed air supply means, and is normally placed in a contracted position at the bottom as shown in FIGS. 4A and B. By injecting compressed air, the bag body 12 is It is expanded to the upper end of the support frame 4 as shown in FIG. 13a,
13b is 2 provided along the length direction of the support frame 4.
The rope material is a book, and the upper end of each bag body 12 is a rope material 13.
a, 13b. A fixing claw 14 for fixing the cable members 13a and 13b is provided at the upper end of each support column 6, and when the bag body 12 is inflated, the cable member 1
By fixing 3a and 13b to the fixed claws 14, the bag body 12 is held against strong winds. In this way, the bag 12 is operated to be in the closed state and the non-closed state by expanding and contracting.

第６図〜第８図は自動車防護柵３を回転板式に
構成した例を示す。支持枠体４は支柱６と、上縁
材７からなり、一定幅の多数の回転板１５がその
上下端面の中央にそれぞれ突設された回転ピン１
６を介して上縁材７および基台５により回転自在
に枢支されている。回転板１５は上縁材７と平行
な角度に回転させた時、隣り合う回転板１５と連
続する。回転板１５は遮閉体を構成するものであ
り、またこの場合、各回転板１５の幅ごとに、上
記各実施例の区画Ｍに相当する区画Ｍが構成され
る。各回転板１５には左右両端に隣り合う回転板
１５と噛み合う半割り状凹部１７が設けられてい
る。１８ａ，１８ｂは回転板１５の両側に配置し
た操作用の索材であり、各回転板１５の両面に突
設された各取合突部１９に接続部材２０を介して
接続されている。このような構成の場合、索材１
８ａ，１８ｂを進退させることにより、第６図
Ａ，Ｂのように各回転板１５が上縁材７と直交す
る方向に回転して支持枠体４の両側間を遮閉しな
い状態と、第７図Ａ，Ｂのように各回転板１５が
連続して遮閉する状態とに操作される。 FIGS. 6 to 8 show examples in which the automobile protection fence 3 is configured as a rotary plate type. The support frame 4 is made up of a support column 6 and an upper edge member 7, and has a rotating pin 1 with a large number of rotating plates 15 of a constant width protruding from the center of its upper and lower end surfaces.
It is rotatably supported by the upper edge member 7 and the base 5 via the upper edge member 6 . When the rotary plate 15 is rotated at an angle parallel to the upper edge member 7, it is continuous with the adjacent rotary plate 15. The rotary plate 15 constitutes a shielding body, and in this case, a section M corresponding to the section M in each of the above embodiments is constructed for each width of each rotary plate 15. Each rotating plate 15 is provided with half-split recesses 17 that engage with adjacent rotating plates 15 at both left and right ends. Reference numerals 18a and 18b are operating cables disposed on both sides of the rotary plate 15, and are connected to respective coupling protrusions 19 protruding from both sides of each rotary plate 15 via connection members 20. In such a configuration, the rope material 1
By moving the rotating plates 8a and 18b back and forth, the rotating plates 15 rotate in a direction perpendicular to the upper edge member 7 as shown in FIGS. As shown in FIGS. 7A and 7B, each rotary plate 15 is operated to successively close and close the state.

これら、各実施例の構成によると、強風時には
それぞれカーテン９、袋体１２又は回転板１５に
よつて、支持枠体４の両側間を各区画Ｍにつらな
つて遮閉状態として空気流の偏流壁としての役割
りを果たし、風荷重による補剛桁１の上下方向の
波打ちを抑制することができる。また、常時は、
カーテン９、袋体１２、回転板１５を非遮閉状態
とすることにより、路上通行者の視野を妨げるこ
となく、通常の自動車防護柵としての役目を果た
すことができる。 According to the configuration of each of these embodiments, in the event of strong winds, the curtains 9, the bags 12, or the rotary plates 15 are connected between both sides of the support frame 4 to each section M to block the airflow, resulting in uneven air flow. It serves as a wall and can suppress vertical undulation of the stiffening girder 1 due to wind loads. Also, at all times,
By keeping the curtain 9, the bag 12, and the rotary plate 15 in an unblocked state, it can function as a normal automobile protection fence without obstructing the field of view of passersby on the road.

以上説明したように、本発明によれば、強風時
の空力不安定現象の発生が予想される緊急時には
偏流壁として役目を果たして安定化を図り、かつ
通常時は通行者の視野を妨げない自動車防護柵と
しての機能を得ることができる。 As explained above, according to the present invention, a vehicle can function as a drift wall to stabilize the vehicle in an emergency when aerodynamic instability is expected to occur during strong winds, and does not obstruct the view of passersby during normal times. It can function as a protective fence.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明を適用した長大橋の一例を示す
横断面図、第２図、第３図は本発明の一実施例を
示し、第２図Ａは非遮閉状態における部分正面
図、第２図Ｂは同部分平面図、第３図Ａは遮閉状
態における部分正面図、第３図Ｂは同部分平面
図、第４図、第５図は本発明の他の実施例を示
し、第４図Ａは非遮閉時における部分正面図、第
４図Ｂは同横断面図、第５図Ａは遮閉時における
部分正面図、第５図Ｂは同横断面図、第６図〜第
８図は本発明のさらに他の実施例を示し、第６図
Ａは非遮閉時における部分正面図、第６図Ｂは同
部分平面図、第７図Ａは遮閉時における部分正面
図、第７図Ｂは同部分切欠平面図、第８図は回転
板の斜視図である。 １……補剛桁、２……床、３……自動車防護
柵、４……支持枠体、５……基台、６……支柱、
７……上縁材、９……カーテン、１０ａ，１０ｂ
……索材、１２……ジヤバラ状の袋体、１３ａ，
１３ｂ……索材、１５……回転板、１８ａ，１８
ｂ……索材、Ｍ……区画。 FIG. 1 is a cross-sectional view showing an example of a long bridge to which the present invention is applied, FIGS. 2 and 3 show an embodiment of the present invention, and FIG. 2A is a partial front view in an unblocked state. FIG. 2B is a partial plan view of the same part, FIG. 3A is a partial front view in a closed state, FIG. 3B is a partial plan view of the same part, and FIGS. 4 and 5 show other embodiments of the present invention. , FIG. 4A is a partial front view when not shielded, FIG. 4B is a cross-sectional view of the same, FIG. 5A is a partial front view when closed, FIG. 5B is a cross-sectional view of the same, and FIG. 8 to 8 show still other embodiments of the present invention, FIG. 6A is a partial front view when not shielded, FIG. 6B is a partial plan view of the same, and FIG. 7A is a partial front view when closed. FIG. 7B is a partial front view, FIG. 7B is a cutaway plan view of the same portion, and FIG. 8 is a perspective view of the rotating plate. 1... Stiffening girder, 2... Floor, 3... Car protection fence, 4... Support frame, 5... Base, 6... Support column,
7...Top edge material, 9...Curtain, 10a, 10b
... Rope material, 12 ... Bellows-shaped bag body, 13a,
13b...Rope material, 15...Rotary plate, 18a, 18
b...Cable material, M...Division.

Claims (1)

【特許請求の範囲】[Claims] １ トラス構造の補剛桁を有する橋梁において、
路面中央に長さ方向に沿つて自動車防護用の支持
枠体を立設し、該支持枠体に長さ方向の区画ごと
に耐風安定化用の遮閉体を取付け、該遮閉体は強
風時には各区画につらなつて支持枠体両側間を遮
閉する状態に配置可能で、かつ常時は支持枠体両
側間を非遮閉の状態に配置可能としたことを特徴
とする耐風安全性保持機能を有する自動車防護柵
を設置した橋梁。1. In a bridge with a truss structure stiffening girder,
A support frame body for protecting automobiles is erected along the length direction in the center of the road surface, and wind-resistant stabilizing shields are attached to the support frame for each section in the length direction, and the shields are designed to resist strong winds. Maintaining wind resistance and safety, which is characterized by being able to be arranged in a state in which both sides of the support frame are sometimes closed by being connected to each compartment, and always in a state in which both sides of the support frame are not closed. A bridge equipped with a functional vehicle protection fence.