CN203668809U - Deflectors for controlling vortex-induced vibration of closed steel box girder bridge - Google Patents

Abstract

The utility model provides a deflector for controlling vortex-induced vibration of a closed steel box girder bridge, which relates to bridge engineering technology. Since the closed steel box girder is more sensitive to wind, it is prone to vortex induced resonance with large amplitude under low wind speed. The deflectors are arranged symmetrically at the air nozzles on both sides of the closed steel box girder, the deflectors are connected to the ends of the air nozzles, and the deflectors are fixedly connected to the ends of the air nozzles by riveting, bolting or welding. The whole bridge is arranged continuously along the longitudinal direction of the bridge, and the free end of the deflector cross section is provided with a circular arc. The angle between the deflector plate and the air nozzle in the horizontal direction is -15°～+15°. The width b of the deflector is 1/40-1/30 of the width of the bridge deck, and the thickness t is 10-20mm. The utility model changes the air flow characteristics of the closed steel box girder bridge, and has obvious control effect on the vortex induced resonance. It is mainly used to control vortex-induced vibration in closed steel box girder bridges.

Description

A Deflector for Controlling Vortex-Induced Vibration of Closed Steel Box Girder Bridges

technical field

The utility model belongs to the technical field of bridge engineering, in particular to a deflector used for controlling the vortex-induced vibration of a closed steel box girder bridge.

Background technique

Due to the advantages of strong integrity, high strength, light weight and high degree of industrialization, closed steel box girder has become the main choice of modern super long-span bridges. However, the characteristics of large span, light weight, soft structure, and small damping make the closed steel box girder more sensitive to the effect of wind, and vortex induced resonance with large amplitude is prone to occur at low wind speed. Although vortex induced resonance will not cause bridge instability and damage, it will accelerate the fatigue of bridge components and affect the safety and comfort of bridge operations. Therefore, it is of great significance to take effective vortex-induced vibration control measures to improve its wind-induced vibration performance.

Utility model content

The purpose of the utility model is to provide a deflector for controlling the vortex-induced vibration of a closed steel box girder bridge, which can effectively control the vortex-induced resonance amplitude of the closed steel box girder bridge and improve its overall wind-induced vibration performance.

The purpose of this utility model is achieved through the following technical solutions:

A deflector used to control the vortex-induced vibration of a closed steel box girder bridge. The deflector 1 is symmetrically arranged at the air nozzles on both sides of the closed steel box girder. The bridges are arranged continuously, and the free end of the deflector cross-section is provided with a circular arc.

The deflector 1 is fixedly connected to the end of the air nozzle 3 by riveting, bolting or welding.

The angle between the deflector 1 and the air nozzle 3 in the horizontal direction is -15°～+15°.

The width b of the deflector 1 is 1/40-1/30 of the width of the bridge deck, and the thickness t is 10-20 mm.

The deflector 1 is composed of several segments, and the length of each segment of the deflector 1 is 4-6 m; the segments of each deflector 1 are connected by welding, bolting or riveting.

The deflector 1 is made of alloy or composite material with low density and high rigidity; the free end of the cross section of the deflector is provided with a circular arc.

Description of drawings

Fig. 1 is the schematic diagram of the utility model in the cross-section position of closed steel box girder bridge;

Fig. 2 is a partially enlarged schematic diagram of a closed steel box girder bridge of the present invention;

Fig. 3 is a three-dimensional schematic diagram of a deflector segment of the utility model;

Marked in the attached drawings:

Deflector width b; Deflector thickness t; Deflector segment length.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

In order to effectively control the vortex-induced resonance amplitude of the closed steel box girder bridge, the utility model arranges deflectors 1 symmetrically at the positions of the air nozzles 3 on both sides of the closed steel box girder 2, and the deflectors 1 are connected with the ends of the air nozzles 3, and along the bridge The longitudinal full bridges are arranged continuously.

The deflector 1 is made of alloy or composite material with low density and high rigidity; the free end of the cross section of the deflector 1 is provided with a circular arc; The parts are fixedly connected, and the angle between the deflector 1 and the horizontal direction is -15°～+15°.

The width b of the deflector 1 is 1/40 to 1/30 of the width of the bridge deck, and the thickness t is 10 to 20 mm; the deflector 1 is composed of several segments, and the length of each deflector 1 segment is 4~6m; 1 segment of each deflector is connected by welding, bolting or riveting.

Compared with the prior art, the utility model has the advantages and effects that it can effectively control the vortex-induced resonance amplitude of the closed steel box girder bridge.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (5)

1. one kind for controlling the deflector of closed steel box girder bridge vortex-induced vibration, it is characterized in that: deflector (1) is symmetricly set on tuyere (3) position of closed steel case beam (2) both sides, deflector (1) is connected with tuyere (3) end, arrange continuously along the longitudinal full-bridge of bridge, the free end of deflector (1) cross section is provided with circular arc.

2. according to claim 1 a kind of for controlling the deflector of closed steel box girder bridge vortex-induced vibration, it is characterized in that: described deflector (1) is fixedly connected with tuyere (3) end by riveted joint, bolt or welding.

3. according to claim 1 a kind of for controlling the deflector of closed steel box girder bridge vortex-induced vibration, it is characterized in that: described deflector (1) is-15 °～+ 15 ° with the horizontal direction angle of tuyere (3).

4. according to claim 1 a kind of for controlling the deflector of closed steel box girder bridge vortex-induced vibration, it is characterized in that: the width b of described deflector (1) is bridge deck width 1/40～1/30, thickness t is 10～20mm.

5. according to claim 1 a kind of for controlling the deflector of closed steel box girder bridge vortex-induced vibration, it is characterized in that: deflector (1) is made up of some sections, each deflector (1) sections length is 4～6m; Between each deflector (1) sections by welding, bolt or riveting.

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