Inertia type bridge transverse dynamic deflection measuring device based on sliding rail and eddy current damping

Abstract

The utility model discloses an inertia type bridge transverse dynamic deflection measuring device based on a sliding rail and eddy current damping. The inertia type bridge transverse dynamic deflection measuring device comprises a shell, a spring, a mass block, a displacement meter and a sliding device. The mass block is located in the shell, one ends of the springs are symmetrically fixed to the two ends of the mass block, the other ends of the springs are fixed to the inner wall of the shell, a through hole is formed in an end plate, connected with the springs, of one side of the shell, and the testing end of the displacement meter measures the relative displacement of the mass block and the shell through the through hole. The lower end face of the mass block is fixed to the sliding device, the sliding device is used for offsetting the total gravity of the mass block and the magnets arranged on the mass block, and the moving direction of the sliding device is set to be parallel to the transverse direction of the bridge. The device can be rapidly and conveniently installed in the transverse direction of a bridge, and can accurately measure the transverse dynamic deflection of the bridge.

Description

Technical Field

[0001] The utility model relates to the field of measuring the lateral dynamic deflection of bridges. More specifically, the utility model relates to an inertial bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping. Background Art

[0002] The lateral dynamic deflection of the main girder of a bridge reflects the degree of lateral bending deformation of the beam body under the action of external loads, which has a significant impact on pedestrian comfort, the service life and safety of the bridge. In particular, it is the most intuitive parameter for characterizing the lateral vibration behavior of long-span pedestrian bridges. Accurately and efficiently monitoring / measuring the lateral dynamic deflection of the main girder has important engineering significance and scientific research value. Currently, the commonly used methods for measuring the lateral dynamic deflection of the main girder of a bridge mainly include the Beidou system and GPS (direct measurement) applicable to extra-large vehicle bridges, the acceleration method (indirect measurement) and the graphic method (direct measurement) used for pedestrian bridges. The accuracy of the Beidou system and GPS method is directly related to the number of satellites simultaneously received by the receiver at the measuring point. The accuracy of the remaining measurement methods has nothing to do with the dynamic deflection of the main girder of the bridge (the accuracy is a fixed value after the equipment is produced), and none of them can adapt to the different accuracy requirements for large displacement values and small displacement values. In addition, the Beidou system and GPS require no obstruction at the measuring point, are technically complex and expensive. The image acquisition devices used in the graphic method are difficult to adapt to the adverse effects brought by environments such as rain, snow, fog, and foundation vibration. High-quality lenses are also expensive and difficult to adapt to bridges spanning large rivers and mountainous bridges with crisscross ravines. Indirect measurement methods all need to obtain the dynamic deflection value through complex mathematical operations, and it is difficult to accurately consider the self-error of the data and the actual boundary conditions during data processing, resulting in poor result accuracy. The microwave radar method not only has an extremely high equipment price, but also it is difficult to determine the fixed reference points for its lateral dynamic deflection measurement.

[0003] At present, there are more than 11,000 extra-large bridges in China's highway bridges, and the number of pedestrian bridges is also increasing year by year. In particular, in recent years, the span of pedestrian bridges has been increasing day by day, and the span of some pedestrian bridges exceeds 200m and even reaches more than 300m. The problems of traffic comfort, structural durability and safety brought by the lateral vibration of such bridges are becoming increasingly prominent. There are higher requirements for accurately and efficiently obtaining the lateral vibration displacement of the bridge to evaluate its mechanical properties. Therefore, it is of great significance to provide a method and device for measuring the lateral dynamic deflection of a bridge to achieve accurate and rapid measurement of the lateral dynamic deflection of the beam body and take into account economic requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an inertial bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping, which can be quickly and conveniently installed on the bridge laterally and accurately measure the lateral dynamic deflection of the bridge.

[0005] The technical solution adopted by the present utility model to solve this technical problem is as follows: An inertial type bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping, characterized in that it includes a housing, a spring, a mass block, a displacement gauge and a sliding device;

[0006] The mass block is located inside the housing. One end of a pair of springs is symmetrically fixed to both ends of the mass block, and the other end of the spring is fixed to the inner wall of the housing. A through hole is provided on one side end plate of the housing connected to the spring. The test end of the displacement gauge measures the relative displacement between the mass block and the housing through the through hole. The lower end surface of the mass block is fixed to the sliding device, and the sliding device is used to offset the total gravity of the mass block and the magnets arranged thereon. The moving direction of the sliding device is set to be parallel to the bridge lateral direction.

[0007] As a further solution of the present utility model: The sliding device includes a track and a sliding mechanism. The track is arranged at the bottom inside the housing and is parallel to the bridge lateral direction. The bottom of the sliding mechanism is provided with rollers, and the rollers are arranged on the track.

[0008] As a further solution of the present utility model: The top of the sliding mechanism is provided with a panel, and is fixed to the bottom of the mass block through the panel.

[0009] As a further solution of the present utility model: It further includes a power supply component, and the power supply component is electrically connected to the displacement gauge and continuously supplies power to the displacement gauge.

[0010] As a further solution of the present utility model: It further includes a data transmission module, and the data transmission module is electrically connected to the displacement gauge and saves and transmits the measurement data.

[0011] As a further solution of the present utility model: A magnet is provided on the top surface of the mass block, and a conductor plate is provided on the inner top surface of the first housing.

[0012] The present utility model has at least the following beneficial effects: The inertial type bridge lateral dynamic deflection measuring device of the present utility model converts the inertial type bridge lateral dynamic deflection into the change amount of the mass block relative to the housing, which can be directly measured by the displacement gauge, greatly facilitating the measurement of the beam body lateral dynamic deflection. In order to reduce the influence of the mass block gravity on the spring, a sliding device is provided to offset the gravity of the mass block, improving the measurement accuracy of the device.

[0013] Other advantages, objectives and features of the present utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present utility model. Description of the Drawings

[0014] Figure 1This is a schematic structural diagram of the inertial bridge lateral dynamic deflection measurement device based on a slide rail and eddy current damping of the present utility model.

[0015] Among them, 1 - housing, 2 - spring, 3 - mass block, 4 - displacement gauge, 5 - power supply assembly, 6 - data transmission module, 7 - track, 8 - sliding mechanism, 9 - panel, 10 - conductor plate, 11 - magnet. Specific embodiments

[0016] The present utility model will be described in detail and completely below with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present utility model based on these descriptions. Before describing the present utility model in conjunction with the accompanying drawings, it should be particularly noted that: the technical solutions and technical features provided in each part including the following descriptions of the present utility model can be combined with each other without conflict.

[0017] In addition, the embodiments of the present utility model involved in the following descriptions are usually only part of the embodiments of the present utility model, rather than all of the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work shall fall within the protection scope of the present utility model.

[0018] The following further describes the present utility model in detail in conjunction with the drawings and embodiments, and the specific implementation process is as follows:

[0019] As Figure 1 shown, the present utility model provides an inertial bridge lateral dynamic deflection measurement device based on a slide rail and eddy current damping, including a housing 1, a spring 2, a mass block 3, a displacement gauge 4 and a sliding device;

[0020] The mass block 3 is located inside the housing 1. One end of a pair of springs 2 is symmetrically fixed to both ends of the mass block 3, and the other end of the spring 2 is fixed to the inner wall of the housing 1. A through hole is provided on the end plate on one side of the housing 1 connected to the spring 2. The test end of the displacement gauge 4 measures the relative displacement amount between the mass block 3 and the housing 1 through the through hole. The lower end surface of the mass block 3 is fixed to the sliding device, and the sliding device is used to offset the total gravity of the mass block 3 and the magnet arranged thereon. The moving direction of the sliding device is set to be parallel to the bridge lateral direction.

[0021] In the above technical solution, the usage method of the measurement device is: fix the measurement device on the beam to be measured of the bridge, and make the axis direction of the spring 2 parallel to the lateral direction of the beam; record the lateral displacement of the mass block 3 measured by the displacement gauge 4, which is the bridge lateral dynamic deflection.

[0022] The technical solution may further include the following technical details to better achieve the technical effect: The sliding device includes a track 7 and a sliding mechanism 8. The track 7 is disposed at the bottom inside the housing 1 and is parallel to the transverse direction of the bridge. The bottom of the sliding mechanism 8 is provided with rollers, and the rollers are disposed on the track 7. It should be noted that the sliding device is not limited to the structure listed in this embodiment. The sliding device may also be in the form of a slider and a slide rail, or other structures.

[0023] The technical solution may further include the following technical details to better achieve the technical effect: A panel 9 is disposed on the top of the sliding mechanism 8 and is fixed to the bottom of the mass 3 through the panel 9.

[0024] The technical solution may further include the following technical details to better achieve the technical effect: It further includes a power supply component 5. The power supply component 5 is electrically connected to the displacement gauge 4 and continuously supplies power to the displacement gauge 4 to ensure continuous measurement of the device.

[0025] The technical solution may further include the following technical details to better achieve the technical effect: It further includes a data transmission module 6. The data transmission module 6 is electrically connected to the displacement gauge 4 and saves and transmits the measurement data, thereby realizing automatic measurement.

[0026] The technical solution may further include the following technical details to better achieve the technical effect: A magnet 11 is disposed on the top surface of the mass. A conductor plate 10 is disposed on the inner top surface of the first housing. The conductor plate 10 is located directly above the magnet 11. The conductor plate 10 may be an aluminum plate or a copper plate, or other conductive materials. Eddy current damping is provided by the conductor plate 10 and the magnet 11.

[0027] Although the embodiments of the present utility model have been disclosed as above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present utility model. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present utility model is not limited to the specific details and the embodiments shown and described herein.

Claims

1. An inertial bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping, characterized in that, It includes a housing, a spring, a mass block, a displacement gauge and a sliding device; The mass block is located inside the housing. One end of a pair of springs is symmetrically fixed to both ends of the mass block, and the other end of the spring is fixed to the inner wall of the housing. A through hole is provided on the end plate on one side of the housing connected to the spring. The test end of the displacement gauge measures the relative displacement between the mass block and the housing through the through hole. The lower end surface of the mass block is fixed to the sliding device, and the sliding device is used to offset the total gravity of the mass block and the magnets arranged thereon. The moving direction of the sliding device is set parallel to the transverse direction of the bridge.

2. The inertial bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping according to claim 1, wherein The sliding device includes a track and a sliding mechanism. The track is arranged at the bottom inside the housing and is parallel to the transverse direction of the bridge. The bottom of the sliding mechanism is provided with rollers, and the rollers are arranged on the track.

3. The inertial type bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping according to claim 2, characterized in that, The top of the sliding mechanism is provided with a panel, which is fixed to the bottom of the mass block through the panel.

4. The inertial type bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping according to claim 1, characterized in that, It also includes a power supply component, which is electrically connected to the displacement gauge and continuously supplies power to the displacement gauge.

5. The inertial bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping according to claim 1, characterized in that, It also includes a data transmission module, which is electrically connected to the displacement gauge and saves and transmits the measurement data.

6. The inertial type bridge lateral dynamic deflection measuring device based on a slide rail and eddy current damping according to claim 1, characterized in that Magnets are arranged on the top surface of the mass block, and a conductor plate is arranged on the inner top surface of the housing.

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