A straight web steel box girder capable of suppressing wind vibration

Abstract

The invention discloses a straight web steel box girder capable of suppressing wind vibration, belonging to the technical field of steel box girder structures. A plurality of vibration suppressing parts arranged in the steel box girder are installed, and the vibration suppressing parts can effectively eliminate the vibration of the steel box girder of a bridge body caused by strong wind. When the steel box girder swings in one direction, a swing beam suspended in the steel box girder and a seeding block fixed on the swing beam swing in the opposite direction of the wind flow relative to the steel box girder under the action of gravity. The swing can eliminate the force that pushes the steel box girder to swing in one direction, so that the swing of the steel box girder is reduced or even eliminated. The plurality of vibration suppressing parts respectively eliminate the swing of the steel box girder at their installation positions, so that the swinging trend of the entire steel box girder can be offset, and the vibration of the bridge caused by the swing of the steel box girder caused by the wind can be avoided. This structure eliminates the wind vibration phenomenon caused by the shaking of the bridge caused by strong wind, so that the bridge will not swing under strong wind conditions, thereby ensuring the comfort and safety of bridge driving, and avoiding fatigue damage of bridge components caused by vibration.

Description

Technical Field

[0001] The invention belongs to the technical field of steel box girder structures, and in particular relates to a straight web steel box girder capable of suppressing wind vibration. Background Art

[0002] Bridges are transportation links built on rivers, providing convenience for people's transportation. Steel box girders are bridge components used for splicing bridges, and have the characteristics of light weight, large size, and excellent load-bearing performance. The advantages of steel box girders depend on their structure, which is composed of a combination of steel plates spliced ​​together, with a steel box shell on the outer layer and a skeleton steel plate on the inner layer. In the prior art, in order to ensure the overall load-bearing performance of the steel box girder, the steel box girder is set to be wide, narrow, and has a blunt cross-section shape on both sides. When the bridge installed with the steel box girder is blown by wind on both sides, the strong wind force will cause the bridge to shake, resulting in wind vibration, which will affect the driving on the bridge and cause fatigue damage to the bridge components. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a straight web steel box girder capable of suppressing wind vibration, and to reduce the influence of wind vibration on the steel box girder by controlling the center of gravity of the steel box girder.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention includes a steel box shell, in which a plurality of longitudinally arranged horizontal steel plates and two transversely arranged vertical steel plates are arranged, and also includes two wind plates and a plurality of vibration suppression parts. The plurality of vibration suppression parts are arranged longitudinally along the steel box shell, and the vibration suppression parts include a swing beam, a plurality of suspension steel bars and a plurality of counterweight plates. The swing beam can movably pass through the two ends of the steel box shell and the vertical steel plates, and a plurality of the counterweight plates are arranged and fixed in the middle of the swing beam, and a plurality of the counterweight plates are located in the middle of the steel box beam. One end of the suspension steel bar is fixed at the top of the inner side of the steel box shell, and the other end is fixed to the swing beam, and a plurality of the suspension steel bars are evenly distributed on the swing beam; the two wind plates are arranged on both sides of the steel box shell, and the outer sides of the two wind plates are pointed. The two wind plates are respectively welded to the two ends of the swing beam, and the end of the swing beam is welded to the inner side of the wind plate.

[0006] Furthermore, it also includes a damping part, which includes a damping rod, a base, and a connecting rod. The connecting rod is fixed on one side of the pendulum beam, and the base is fixed to the inner oblique edge of the steel box shell. One end of the damping rod is hinged on the connecting rod, and the other end is hinged on the base. Two damping parts are provided at both ends of each pendulum beam, and the two damping parts are respectively located on the two side surfaces of the pendulum beam. The angle between the damping rod and the pendulum beam is an acute angle.

[0007] Furthermore, the counterweight plate includes an upper plate and a lower swing plate, the upper plate is fixed on the swing beam, the lower swing plate is hinged on the lower edge of the upper plate, the swing direction of the lower swing plate is toward the two sides of the steel box shell, and also includes a synchronization bar, the middle parts of all the lower swing plates on the same swing beam are respectively hinged on the synchronization bar, the spacing between the hinge points is equal to the spacing between several counterweight plates, and the two ends of the synchronization bar are respectively connected with restraining steel bars, the other ends of the restraining steel bars are fixed on the vertical steel plate, and the restraining steel bars are parallel to the horizontal plane.

[0008] Furthermore, it also includes a wind hole, which is opened on the wind plate and passes through the swing beam to the other end.

[0009] Furthermore, the diameter of the hole through which the swing beam passes through the steel box shell and the vertical steel plate is larger than the cross-section of the swing beam.

[0010] Furthermore, the wind plate is of the same length as the steel box shell, and the front and rear ends of the wind plate are provided with male and female connectors for connection. When several of the steel box shells are connected, the wind plates are connected in sequence.

[0011] The beneficial effects of the present invention are:

[0012] In the present invention, several vibration suppression parts respectively eliminate the swing of the steel box girder at their installation positions, so that the swing tendency of the entire steel box girder can be offset, thereby preventing the steel box girder from swinging due to wind and causing bridge vibration. This structure eliminates the wind vibration phenomenon caused by the shaking of the bridge due to strong winds, so that the bridge will not swing under strong winds, thereby ensuring the comfort and safety of bridge driving and avoiding fatigue damage of bridge components due to vibration.

[0013] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0015] Figure 1 This is a schematic diagram of the structure of a steel box girder according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the internal structure of the steel box shell according to an embodiment of the present invention;

[0017] Figure 3 for Figure 2 A magnified schematic diagram of point A;

[0018] Figure 4 for Figure 2 An enlarged schematic diagram of point B;

[0019] Figure 5 is a transverse cross-sectional view of an embodiment of the present invention at a vibration suppression portion;

[0020] The markings in the attached drawings are as follows: 1. Steel box shell; 11. Horizontal steel plate; 12. Vertical steel plate; 2. Wind plate; 3. Vibration suppression part; 31. Swing beam; 32. Suspension steel bar; 33. Counterweight plate; 331. Upper plate; 332. Lower swing plate; 333. Synchronous bar; 334. Suppression steel bar; 34. Damping part; 341. Damping rod; 342. Base; 343. Connecting rod; 35. Wind hole. DETAILED DESCRIPTION

[0021] like Figures 1 to 5 As shown, the present invention provides a straight web steel box girder capable of suppressing wind vibration, which is used for building a bridge body, referring to Figure 1 and Figure 2 The steel box girder comprises a steel box shell 1, the cross section of which is long and narrow and is inclined upward from the bottom to both sides. A plurality of longitudinally arranged horizontal steel plates 11 and two transversely arranged vertical steel plates 12 are arranged in the steel box shell 1. The horizontal steel plates 11 and the vertical steel plates 12 are both arranged vertically to support the steel box shell 1; Figure 2 As shown, it also includes two wind plates 2 and a plurality of vibration suppression parts 3, which are arranged longitudinally along the steel box shell 1. The vibration suppression parts 3 include a swing beam 31, a plurality of suspension steel bars 32 and a plurality of counterweight plates 33. The swing beam 31 is an iron pipe, and the swing beam 31 can move through the two ends of the steel box shell 1 and the vertical steel plate 12. Figure 5 As shown, the diameter of the hole through which the swing beam 31 passes through the steel box shell 1 and the vertical steel plate 12 is larger than the cross section of the swing beam 31. Figure 4 As shown, a plurality of the counterweight plates 33 are arranged and fixed in the middle of the swing beam 31, and a plurality of the counterweight plates 33 are located in the middle of the steel box beam. One end of the suspension steel bar 32 is fixed on the top of the inner side of the steel box shell 1, and the other end is fixed on the swing beam 31. Figure 5 , a number of the suspension steel bars 32 are evenly distributed on the swing beam 31; two of the wind plates 2 are arranged on both sides of the steel box shell 1, the outer sides of the two wind plates 2 are pointed, the two wind plates 2 are welded to the two ends of the swing beam 31, and the end of the swing beam 31 is welded to the inner side of the wind plate 2, refer to Figure 1 The wind plate 2 is of the same length as the steel box shell 1, and the front and rear ends of the wind plate 2 are provided with male and female connectors for connection. When several steel box shells 1 are connected, the wind plates 2 are connected in sequence, so that the wind plates 2 on both sides of the connected steel box beam also form an integrated long strip.

[0022] The steel box girder is equipped with a plurality of vibration suppression parts 3 arranged inside the steel box girder, and the vibration suppression parts 3 can effectively eliminate the vibration of the steel box girder of the bridge body caused by strong wind; the principle is as follows: when the pointed wind plate 2 is blown by the wind, the wind flow blowing horizontally to the wind plate 2 is dispersed by the wind plate 2, and most of the dispersed wind force flows to the steel box girder, and together with the horizontal wind flow blowing directly to the steel box girder, the steel box girder has a tendency to swing in the direction of the wind flow. When the steel box girder swings in one direction, the swing beam 31 suspended inside the steel box girder and the seed block fixed on the swing beam 31 are relatively swung under the action of gravity. The steel box girder swings in the opposite direction of the wind flow, and this swing can eliminate the force that pushes the steel box girder to swing in one direction, so that the swing of the steel box girder is reduced or even eliminated; a number of vibration suppression parts 3 respectively eliminate the swing of the steel box girder at their installation positions, so that the swing trend of the entire steel box girder can be offset, and the wind-induced swing of the steel box girder to cause bridge vibration can be avoided. This structure eliminates the wind vibration phenomenon caused by the shaking of the bridge due to strong winds, so that the bridge will not swing even in strong winds, thereby ensuring the comfort and safety of bridge driving and avoiding fatigue damage to bridge components due to vibration.

[0023] For further solutions, refer to Figure 3 , also includes a damping part 34, the damping part 34 includes a damping rod 341, a base 342, and a connecting rod 343, the connecting rod 343 is fixed on one side of the swing beam 31, the base 342 is fixed to the inner oblique edge of the steel box shell 1, one end of the damping rod 341 is hinged on the connecting rod 343, and the other end is hinged on the base 342, two damping parts 34 are provided at both ends of each of the swing beams 31, the two damping parts 34 are respectively located on the two side surfaces of the swing beam 31, and the angle between the damping rod 341 and the swing beam 31 is an acute angle.

[0024] In this structure, each swing beam 31 has four damping parts 34, which are respectively arranged on both ends of the swing beam 31, so that the swing beam 31 can remain stable when balanced, and will not deflect forward and backward or swing left and right due to slight vibrations. In strong winds, when the swing of the entire steel box beam causes the swing beam 31 to swing, the damping part 34 can quickly support the swing beam 31 to return to its original position, thereby avoiding the swing of the steel box beam 31 after the swing of the swing beam 31 stops, causing the steel box beam to swing again.

[0025] In a further solution, Figure 2 , Figure 4 and Figure 5As shown, the counterweight plate 33 includes an upper plate 331 and a lower swing plate 332, the upper plate 331 is fixed on the swing beam 31, the lower swing plate 332 is hinged on the lower edge of the upper plate 331, and the swing direction of the lower swing plate 332 is toward the two sides of the steel box shell 1, and also includes a synchronization bar 333, the middle parts of all the lower swing plates 332 on the same swing beam 31 are respectively hinged on the synchronization bar 333, the hinge point spacing is equal to the spacing of several counterweight plates 33, and the two ends of the synchronization bar 333 are respectively connected with restraining steel bars 334, the other ends of the restraining steel bars 334 are fixed on the vertical steel plate 12, and the restraining steel bars 334 are parallel to the horizontal plane.

[0026] This structure is used to further assist the balance and return of the vibration suppression part 3 and the steel box shell 1. When the wind flow drives the steel box shell 1 to swing in the wind direction, the swing beam 31 swings in the opposite direction, and the upper plate 331 of the counterweight plate 33 moves in the opposite direction, so that the lower swing plate 332 swings in the wind direction under the action of gravity, so that the lower swing plate 332 pulls the swing beam 31 to return to its position. By setting the synchronization bar 333, the collision between the lower swing plates 332 can also be avoided. By setting the suppression steel bar 334, the suppression steel bar 334 flexibly controls the position of the lower swing plate 332 in the middle of the steel box beam, avoiding excessive swing of the lower swing plate 332 and assisting the rapid return of the lower swing plate 332. Through this structure, the swing of the steel box beam will be quickly consumed by the lower swing plate 332 and the swing beam 31 with the upper plate 331, so that the swing of the entire steel box beam under the action of wind flow is further reduced.

[0027] In a further solution, Figure 5 As shown, it also includes an air hole 35, which is opened on the wind plate 2 and passes through the swing beam 31 to the other end. The setting of the air hole 35 is to further avoid the influence of wind force on the swing beam 31. The wind passes through the air hole 35 of the swing beam 31, reducing the influence of the wind flow at the swing beam 31 on the wind plate 2 and reducing the swing of the wind flow direction of the swing beam 31; it also reduces the gravity of the entire swing beam 31 to control the weight of the entire steel box girder.

[0028] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A straight web steel box girder capable of suppressing wind vibration, comprising a steel box shell (1), wherein a plurality of longitudinally arranged transverse steel plates (11) and two transversely arranged vertical steel plates (12) are arranged in the steel box shell (1), characterized in that: The invention also comprises two wind plates (2) and a plurality of vibration suppression parts (3), wherein the plurality of vibration suppression parts (3) are arranged in a longitudinal direction of the steel box shell (1), and the vibration suppression parts (3) comprise a swing beam (31), a plurality of suspension steel bars (32) and a plurality of counterweight plates (33), wherein the swing beam (31) can movably pass through the two ends of the steel box shell (1) and the vertical steel plate (12), and the plurality of counterweight plates (33) are arranged and fixed in the middle of the swing beam (31), and the plurality of counterweight plates (33) are located in the middle of the steel box beam, and one end of the suspension steel bar (32) is fixed in the middle of the steel box shell. (1) has a top on the inner side, and the other end is fixedly connected to the swing beam (31), and a plurality of suspension steel bars (32) are evenly distributed on the swing beam (31); two wind plates (2) are arranged on both sides of the steel box shell (1), and the outer sides of the two wind plates (2) are pointed, and the two wind plates (2) are respectively welded to the two ends of the swing beam (31), and the end of the swing beam (31) is welded to the inner side of the wind plate (2); and also includes a wind hole (35), which is opened on the wind plate (2) and penetrates along the swing beam (31) to the other end.

2. The straight web steel box girder capable of suppressing wind vibration according to claim 1, characterized in that: The utility model also comprises a damping part (34), wherein the damping part (34) comprises a damping rod (341), a base (342), and a connecting rod (343), wherein the connecting rod (343) is fixedly arranged on one side of the swing beam (31), and the base (342) is fixedly arranged on the inner oblique edge of the steel box shell (1), and one end of the damping rod (341) is hinged on the connecting rod (343), and the other end is hinged on the base (342), and two damping parts (34) are arranged at both ends of each swing beam (31), and the two damping parts (34) are respectively located on two side surfaces of the swing beam (31), and the angle between the damping rod (341) and the swing beam (31) is an acute angle.

3. The straight web steel box girder capable of suppressing wind vibration according to claim 1, characterized in that: The counterweight plate (33) comprises an upper plate (331) and a lower swing plate (332), wherein the upper plate (331) is fixed on the swing beam (31), and the lower swing plate (332) is hinged to the lower edge of the upper plate (331), and the swing direction of the lower swing plate (332) is toward the two sides of the steel box shell (1), and further comprises a synchronization bar (333), wherein the middle parts of all the lower swing plates (332) on the same swing beam (31) are respectively hinged to the synchronization bar (333), and the distance between the hinge points is equal to the distance between a plurality of the counterweight plates (33), and the two ends of the synchronization bar (333) are respectively connected to a restraining steel bar (334), and the other end of the restraining steel bar (334) is fixed to the vertical steel plate (12), and the restraining steel bar (334) is parallel to the horizontal plane.

4. The straight web steel box girder capable of suppressing wind vibration according to claim 1, characterized in that: The diameter of the hole through which the swing beam (31) passes through the steel box shell (1) and the vertical steel plate (12) is larger than the cross section of the swing beam (31).

5. The straight web steel box girder capable of suppressing wind vibration according to claim 1, characterized in that: The wind plate (2) is of equal length to the steel box shell (1), and the front and rear ends of the wind plate (2) are provided with male and female connectors for connection. When a plurality of the steel box shells (1) are connected, the wind plates (2) are connected in sequence.

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