CN-116411507-B - Box girder bridge vortex vibration suppression mechanism

Abstract

The utility model provides a box girder bridge vortex shakes suppressing mechanism for the box girder bridge that is formed by the connection of multisection hollow box girder, this box girder bridge vortex shakes suppressing mechanism includes pump station, the vortex shakes detection device and the filling water tank of setting on the box girder bridge, the pump station is got water from the river course of box Liang Qiaoxia side, the filling water tank sets up in the inside cavity of box girder, is provided with water inlet and delivery port on the filling water tank, and the water inlet of filling water tank is connected with the outlet conduit of pump station, and the delivery port sets up in filling water tank bottom, and the delivery port is provided with the drainage pipe that leads to the box girder outside, is provided with electric drainage valve on the drainage pipe, pump station, vortex shakes detection device and electric drainage valve all with central controller electric connection. The invention provides a box girder bridge vortex vibration suppression mechanism which can dynamically adjust the natural vortex vibration frequency of a bridge and prevent vortex vibration.

Inventors

• JIA FUQIANG
• YANG CAIQING
• HAN DONGYANG
• Ruan Yuanxun
• HE FENGNIAN
• HOU YAWEI
• REN JUANJUAN
• Qin Huachuan
• WU YIFENG
• ZHOU JING
• FENG XU

Assignees

• 韩东阳

Dates

Publication Date

20260505

Application Date

20230417

Claims (6)

1. 1. The box girder bridge vortex vibration suppression mechanism is formed by connecting a plurality of hollow box girders and is characterized by comprising a pump station, a vortex vibration detection device and a filling water tank, wherein the vortex vibration detection device is arranged on the box girder bridge, the pump station is used for taking water from a river channel in the direction of a box Liang Qiaoxia, the filling water tank is arranged in an inner cavity of the box girders, a water inlet and a water outlet are formed in the filling water tank, the water inlet of the filling water tank is connected with a water outlet pipeline of the pump station, the water outlet is arranged at the bottom of the filling water tank, a water outlet is provided with a water drain pipeline leading to the outside of the box girders, an electric drain valve is arranged on the water drain pipeline, the pump station, the vortex vibration detection device and the electric drain valve are all electrically connected with a central controller, the cross section of the filling water tank is in a groove shape with two sides high and low in the middle, and a contracted throat channel is formed in the middle of the bottom of the groove of the filling water tank.
2. 2. The device for suppressing vortex vibration of a box girder bridge according to claim 1, wherein a water inlet flow meter is arranged on a water outlet pipeline of the pump station, a water outlet flow meter is arranged on a water outlet pipeline arranged on the box girder, and the water inlet flow meter and the water outlet flow meter respectively output water inlet flow signals and water outlet flow signals to a central controller.
3. 3. The vortex vibration suppression mechanism for the box girder bridge is characterized in that a spoiler is arranged in the pouring water tank and is parallel to the horizontal central axis of the box girder bridge, the top of the spoiler is connected with the top of the pouring water tank, and a water flow channel is arranged between the bottom of the spoiler and the bottom plate of the pouring water tank.
4. 4. The device for suppressing vortex shedding and vibration of a box girder bridge according to claim 1, wherein independent filling water tanks are respectively arranged in the multi-section box girder, the filling water tanks are connected through water filling pipes, drainage pipelines are arranged on the filling water tanks, electric drainage valves are arranged on the drainage pipelines, and the electric drainage valves on the filling water tanks are electrically connected with a central controller.
5. 5. The device for suppressing vortex vibration of a box girder bridge according to claim 1, wherein the filtering devices are arranged on a water inlet pipeline for taking water from a river channel and a water outlet pipeline for supplying water to a pouring water tank.
6. 6. The device for suppressing the vortex vibration of the box girder bridge according to claim 1, wherein the vortex vibration detecting device is one or more of an acceleration sensor, a fiber grating sensor, an acoustic sensor and a vibration sensor.

Description

Box girder bridge vortex vibration suppression mechanism Technical Field The invention relates to a box girder bridge vortex vibration suppression mechanism, and belongs to the technical field of bridge engineering and safety. Background Bridge vortex-induced vibration refers to the phenomenon of vortex-induced vibration of a bridge in a fluid, and when the fluid flows through the bridge, the vortex-induced vibration may be induced under certain conditions, so that the bridge structure is vibrated and damaged. Particularly, for a box girder bridge, separation of air flow and generation of vortex flow are easily caused due to special shapes of the box girder bridge, such as flanges, side walls and the like of a cross section, and vortex vibration phenomenon is possibly caused by the special shapes when the air flow speed is high. The box Liang Zhongkong of the box girder bridge naturally reduces the dead weight of the bridge, but the lighter bridge structure is easy to generate vortex vibration when being subjected to wind load. In order to eliminate the vortex-induced vibration of the box girder bridge, the bridge geometry is generally adjusted by 1, the flow characteristics of the fluid flowing through the bridge can be changed by adjusting the bridge geometry, such as changing the beam Duan Kuandu, the inclination angle, the flange shape and the like, so as to reduce the generation of the vortex-induced vibration, 2, a damping device is arranged on the bridge structure, such as a vortex-induced vibration damper, a vortex-induced vibration energy absorber and the like, the amplitude and the frequency of the vortex-induced vibration can be reduced by consuming the vortex-induced vibration energy, 3, the mass is added, such as adding an additive to the bridge structure or adding the mass of the bridge itself, so as to change the dynamic characteristics of the bridge, so as to reduce the generation of the vortex-induced vibration, and 4, the fluid flow rate is controlled by controlling the speed of the fluid flowing through the bridge, such as adjusting the section of a river channel dredging and other measures. However, the methods adopted at present are all used for adjusting the natural vortex-vibration frequency of the bridge, and when the fluid speed exceeds the specific critical flow rate of the bridge structure, the bridge still generates vortex-vibration when encountering the vortex-vibration excitation frequency close to the natural frequency of the bridge structure. Therefore, the above measures can only reduce the probability of vortex-induced vibration of the bridge, and cannot completely avoid the occurrence of vortex-induced vibration. Disclosure of Invention The invention aims to provide a box girder bridge vortex vibration suppression mechanism which can dynamically adjust the natural vortex vibration frequency of a bridge and prevent vortex vibration. The technical scheme includes that the box girder bridge vortex-vibration suppression mechanism is used for a box girder bridge formed by connecting a plurality of hollow box girders and comprises a pump station, a vortex-vibration detection device and a filling water tank, wherein the vortex-vibration detection device is arranged on the box girder bridge, the pump station takes water from a river channel in the direction of a box Liang Qiaoxia, the filling water tank is arranged in an inner cavity of the box girder, a water inlet and a water outlet are arranged on the filling water tank, the water inlet of the filling water tank is connected with a water outlet pipeline of the pump station, the water outlet is arranged at the bottom of the filling water tank, a water outlet is provided with a water outlet pipeline leading to the outside of the box girder, and an electric drain valve is arranged on the water outlet pipeline, and the pump station, the vortex-vibration detection device and the electric drain valve are electrically connected with a central controller. In the invention, when the box girder bridge encounters strong airflow and the vortex vibration sensor detects vibration of the bridge, the central controller starts the pump station to pump river water into the pouring water tank so as to improve the dead weight of the box girder. The relation formula between the girder bridge vortex-induced vibration frequency and the weight of a single girder can be estimated using the following empirical formula f= (kxvw/M))/2 pi, Wherein: f, vortex vibration frequency, unit is Hz The empirical coefficient is dependent on factors such as the geometric shape, the material property and the like of the bridge, and the value of k is between 0.1 and 1.0 for the box girder bridge; w is the weight of a single box girder, and the unit is N or kg And M is equivalent mass of a single box girder, the unit is kg, and a vortex vibration mass correction term introduced in the process of calculating the vortex vibration effect is used for considering the additio