阅读说明：本技术 一种大跨度桥梁的抗风护栏 (Wind-resistant guardrail of large-span bridge ) 是由 曾敏 文望青 罗春林 严爱国 王存国 陈裕民 黄振 曹阳梅 郭安娜 王志平 聂利 于 2020-06-05 设计创作，主要内容包括：本发明提供了一种大跨度桥梁的抗风护栏,包括设置在桥面两侧的检修栏杆,以及设置在桥面的车行道两侧的车行道护栏；所述检修栏杆包括沿顺桥向交替布置的第一通透区和第一封闭区,所述车行道护栏包括沿顺桥向交替布置的第二通透区和第二封闭区,且桥面同侧的第一封闭区和第二封闭区错列布置。该发明通过对桥梁上检修栏杆和车行道栏杆的外形结构进行处理,使其形成半封闭半通透,且检修栏杆和车行道栏杆的封闭区错列布置的结构形式,有效改变了桥梁结构周围气流的绕流形态,从而达到了抑制桥梁的涡激振动的目的。(The invention provides a wind-resistant guardrail of a large-span bridge, which comprises maintenance handrails arranged on two sides of a bridge floor and roadway guardrails arranged on two sides of a roadway of the bridge floor; the maintenance railing includes along first penetrating district and the first closed region of following bridge to alternative arrangement, the roadway guardrail includes along second penetrating district and the second closed region of following bridge to alternative arrangement, and the first closed region and the closed region staggered arrangement of second of bridge floor homonymy. According to the invention, the appearance structures of the overhaul railing and the roadway railing on the bridge are processed to form a semi-closed and semi-permeable structure, and the enclosed areas of the overhaul railing and the roadway railing are arranged in a staggered manner, so that the streaming form of airflow around the bridge structure is effectively changed, and the purpose of inhibiting vortex-induced vibration of the bridge is achieved.)

1. The utility model provides an anti-wind guardrail of large-span bridge which characterized in that: the maintenance guardrail comprises maintenance railings arranged on two sides of a bridge floor and roadway guardrails arranged on two sides of a roadway of the bridge floor; the maintenance railing includes along first penetrating district and the first closed region of following bridge to alternative arrangement, the roadway guardrail includes along second penetrating district and the second closed region of following bridge to alternative arrangement, and the first closed region and the closed region staggered arrangement of second of bridge floor homonymy.

2. The wind-resistant guard rail of a large-span bridge as claimed in claim 1, wherein: the maintenance railing is the metal railing, includes along a plurality of first stands that set up along the bridge to equidistant, is one railing unit between per two adjacent first stands, first penetrating district comprises 3 ~ 6 railing units, first closed region comprises one railing unit and the closed part that seals this railing unit.

3. The wind-resistant guard rail of a large-span bridge as claimed in claim 2, wherein: be equipped with the weather strip that a plurality of equidistant was arranged between two adjacent first stands, weather strip and first stand parallel arrangement.

4. A wind-resistant guard rail for a long-span bridge according to claim 1 or 2, wherein: the distance between two adjacent first closed areas is equal.

5. The wind-resistant guard rail of a large-span bridge as claimed in claim 1, wherein: the roadway guardrail adopts a combined structure form of a lower concrete guardrail and an upper steel guardrail.

6. The wind-resistant guard rail of a large-span bridge according to claim 5, wherein: the upper portion steel guardrail of roadway guardrail includes along a plurality of second stands that set up along the bridge to equidistant, is a guardrail unit between per two adjacent second stands, the penetrating district of second comprises 3 ~ 6 guardrail units, the closed part two that the second is closed comprises a guardrail unit and seals this guardrail unit.

7. The wind-resistant guard rail of a large-span bridge as claimed in claim 6, wherein: and a plurality of cross beams are connected between two adjacent second upright columns at intervals, and the cross beams are vertically arranged with the second upright columns.

8. The wind-resistant guard rail of a large-span bridge according to claim 1 or 6, wherein: the distance between two adjacent second closed areas is equal.

9. The wind-resistant guard rail of a large-span bridge as claimed in claim 1, wherein: the first closed area and the second closed area on the same side of the bridge deck are alternately arranged in sequence.

Technical Field

The invention belongs to the technical field of bridge engineering, and particularly relates to a wind-resistant guardrail of a large-span bridge.

Background

With the continuous progress of construction technology and the rapid development of novel materials, the span of modern bridges is also continuously increased, the bridge structure is more sensitive to the action of wind, the dynamic response is more prominent, and the wind-induced vibration problem of the structure becomes a factor restricting the design of structural rigidity, strength and stability. The aerodynamic force causing the wind-induced vibration of the bridge is generated by bypassing the cross section airflow of the bridge and the structural vibration response, wherein the vortex-induced vibration is a wind-induced vibration phenomenon which easily occurs to the bridge structure at a lower wind speed, and is amplitude limiting vibration, the frequency of occurrence of the amplitude limiting vibration is large, the wind speed is low, the fatigue and the strength of the structure are influenced, the comfort level of bridge deck driving can be reduced, and even the traffic safety can be endangered, so the problem of the vortex-induced vibration of the bridge is a very important problem of a large-span bridge.

At present, researches show that the shape arrangement of a bridge is properly changed or some flow guide devices are added, and the flow winding form around the structure is changed by changing the shape of a section, so that the aerodynamic force acting on the structure is changed, and the aim of reducing the vortex-induced vibration of the bridge can be fulfilled. Therefore, how to properly adjust the shapes of auxiliary facilities of the main beam, such as sidewalk railings, vehicle crash barriers and the like, so as to achieve the purposes of improving the aerodynamic characteristics of the main beam and reducing wind-induced vibration has important significance.

Disclosure of Invention

The invention aims to provide a wind-resistant guardrail of a long-span bridge, which changes the structural shapes of a maintenance guardrail and a roadway guardrail of the bridge and achieves the purpose of reducing vortex-induced vibration of the bridge.

The technical scheme of the invention provides a wind-resistant guardrail of a large-span bridge, which comprises maintenance railings arranged at two sides of a bridge floor and roadway guardrails arranged at two sides of a roadway of the bridge floor; the maintenance railing includes along first penetrating district and the first closed region of following bridge to alternative arrangement, the roadway guardrail includes along second penetrating district and the second closed region of following bridge to alternative arrangement, and the first closed region and the closed region staggered arrangement of second of bridge floor homonymy.

Further, the maintenance railing is the metal railing, includes along a plurality of first stands that set up along the bridge to equidistant, is one railing unit between per two adjacent first stands, first penetrating district comprises 3 ~ 6 railing units, first closed region comprises one railing unit and the closed piece that seals this railing unit.

Further, a plurality of wind shielding strips which are arranged at equal intervals are arranged between every two adjacent first stand columns, and the wind shielding strips are arranged in parallel with the first stand columns.

Further, the distance between two adjacent first closed areas is equal.

Furthermore, the roadway guardrail adopts a combined structure form of a lower concrete guardrail and an upper steel guardrail.

Further, the upper portion steel guardrail of roadway guardrail includes along a plurality of second stands that set up along the bridge to equidistant, is a guardrail unit between per two adjacent second stands, the penetrating district of second comprises 3 ~ 6 guardrail units, the closed region of second comprises guardrail unit and closed two of the closure piece of this guardrail unit.

Furthermore, a plurality of cross beams are connected between two adjacent second upright columns at intervals, and the cross beams are arranged perpendicular to the second upright columns.

Further, the distance between two adjacent second closed areas is equal.

Further, the first closed area and the second closed area on the same side of the bridge deck are alternately arranged in sequence.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the wind-resistant guardrail of the large-span bridge, the appearance structures of the maintenance railings and the roadway railings on the bridge are processed to form a semi-closed and semi-permeable structure, and the closed areas of the maintenance railings and the roadway railings are arranged in a staggered mode, so that the streaming form of airflow around the bridge structure is effectively changed, and the purpose of inhibiting vortex-induced vibration of the bridge is achieved.

(2) Through the research of a real bridge wind tunnel test, the vortex-induced vibration amplitude of the large-span bridge provided by the invention is reduced from 375mm to 57.1mm, and the effect is very obvious.

The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic structural diagram of a wind-resistant guardrail of a large-span bridge in an embodiment of the invention;

FIG. 2 is a schematic view of the construction of a service rail in an embodiment of the invention;

FIG. 3 is a schematic view of the structure of a roadway barrier in an embodiment of the present invention;

FIG. 4 is a graph of the amplitude of vortex vibration of a bridge using a conventional service balustrade, a roadway barrier, and a wind barrier according to the present invention.

Description of reference numerals: 1. a bridge deck; 2. a roadway barrier; 3. overhauling the railing; 4. a first upright post; 5. a first pass-through zone; 6. a first closed region; 7. a first closing part; 8. a balustrade unit; 9. a weather strip; 10. a lower concrete guard rail; 11. a second upright post; 12. a second closed region; 13. a second pass-through region; 14. a second sealing part; 15. a guardrail unit; 16. a cross member.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, the meaning of "plurality" or "a plurality" is two or more unless otherwise specified.

As shown in fig. 1, 2 and 3, the present embodiment provides a wind-resistant guard rail for a large-span bridge, including service railings 3 disposed at both sides of a bridge deck 1, and roadway guard rails 2 disposed at both sides of a roadway of the bridge deck 1; the maintenance railing 3 includes along first penetrating district 5 and the first closed region 6 of following the bridge to alternative arrangement, the roadway guardrail 2 includes along second penetrating district 13 and the closed region 12 of second along the bridge to alternative arrangement, and the first closed region 6 and the closed region 12 of second of 1 homonymy of bridge floor are staggered to be arranged, and the first closed region of maintenance railing 3 corresponds the second penetrating district 13 of roadway guardrail 2 promptly, and the closed region 12 of second of roadway guardrail 2 corresponds the first penetrating district 5 of maintenance railing 3. Preferably, the first closed areas 6 and the second closed areas 12 on the same side of the bridge surface 1 are alternately arranged in sequence. In this embodiment, through carrying out special treatment to the appearance structure of overhauing railing 3 and roadway railing 2 on the bridge, make overhauing railing 3 and roadway railing 2 form semi-closed semi-penetrating, and the closed zone staggered arrangement's of both structural style has effectively changed the form of streaming of airflow around the bridge structures to the vortex induced vibration's of suppression bridge purpose has been reached.

Specifically, overhaul railing 3 and be the metal railing, set up the both sides border position at bridge floor 1, roadway guardrail 2 adopts the combination guardrail, the integrated configuration form of lower part concrete guardrail 10 and upper portion steel guardrail promptly.

The structure of the overhaul railing 3 is refined, as shown in fig. 2, the overhaul railing 3 comprises a plurality of first stand columns 4 which are arranged at equal intervals along the bridge direction, a railing unit 8 is arranged between every two adjacent first stand columns 4, the interval between every two adjacent first stand columns 4 is generally 1.5-2 m, the first through area 5 is formed by 3-6 railing units 8, air flow acting around the bridge structure can flow through the first through area 5, and the first through area 5 in the embodiment is formed by 3 railing units 8; the first closed area 6 is composed of a railing unit 8 and a first closing part 7 for closing the railing unit 8, the first closing part 7 can be a sealing plate, and airflow acting on the first closed area 6 is blocked by the first closing part 7 and flows around to the first through area 5 to circulate, so that the flow surrounding state of airflow around the bridge structure is changed, and the purpose of restraining vortex-induced vibration of the bridge is achieved. Optimally, the distance between two adjacent first closed areas 6 is equal, that is, the number of the railing units 8 in each first through area 5 is the same, so that the aerodynamic force acting on the service railing 3 is uniformly distributed. Further, be equipped with the weather strip 9 that a plurality of equidistant arrangement between two adjacent first stands 4, weather strip 9 and first stand 4 parallel arrangement, the setting of weather strip 9 not only can strengthen the intensity of overhauing railing 3, but also can further change the form of streaming of its surrounding air current.

Refine lane guardrail 2 structure, as shown in fig. 3, the upper portion steel guardrail of lane guardrail 2 includes along a plurality of second stands 11 of following the equidistant setting of bridge direction, and the interval between two adjacent second stands 11 is 1.5 ~ 2m generally, and the optimization can be with the second stand 11 of the lane guardrail 2 of 1 homonymy of bridge floor and the first stand 4 one-to-one setting of maintenance railing 3. A guardrail unit 15 is arranged between every two adjacent second upright posts 11, the second through area 13 is formed by 3-6 guardrail units 15, air flow acting around the roadway guardrail 2 can flow through the second through area 13, and the second through area 13 is formed by 3 guardrail units 15; the second closed area 12 is composed of a guardrail unit 15 and a second closed part 14 for closing the guardrail unit 15, the second closed part 14 can be a sealing plate, and airflow acting on the second closed area 12 is blocked by the second closed part 14 and flows around to the second through area 13 for circulation, so that the flowing around form of the airflow around the roadway guardrail 2 is changed, and the purpose of restraining vortex-induced vibration of a bridge is achieved. Preferably, the distance between two adjacent second closed areas 12 is equal, i.e. the number of guardrail units 15 in each of said second through areas 13 is the same, so that the aerodynamic force acting on the roadway guardrail 2 is evenly distributed. Further, a plurality of cross beams 16 are connected between two adjacent second upright posts 11 at intervals, the cross beams 16 are perpendicular to the second upright posts 11, and the strength of the roadway guardrail 2 is enhanced due to the arrangement of the cross beams 16.

Adopt this embodiment to overhaul the bridge that railing and roadway guardrail appearance carried out special treatment and the bridge that conventional overhaul railing and roadway guardrail were not handled carries out real bridge wind tunnel test, and its testing process is prior art, and here is no longer repeated, and the test result is shown as figure 4, and wherein, a diagram shows the test result that conventional overhaul railing and roadway guardrail were not handled, and b diagram shows that this embodiment carries out special treatment's test result to overhaul railing and roadway guardrail appearance. The test result shows that the amplitude of vortex-induced vibration of the bridge is reduced from 375mm to 57.1mm by adopting the wind-resistant guardrail of the large-span bridge, and the action effect is very obvious.

The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.