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Magnetic field-based pier scour monitoring system and monitoring method

A monitoring system and bridge pier technology, applied in electromagnetic measurement devices, electric/magnetic depth measurement, etc., can solve the problems of complex mechanism, destruction of life and property, no online scour monitoring system and method, and achieve good concealment and strong adaptability. , The effect of solving the problem of pier scour monitoring and early warning

Inactive Publication Date: 2018-02-16
SOUTHWEST UNIVERSITY
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In summary, the mechanism of bridge scour is very complex. With the change of hydrological phenomena, the damage to the bridge is sudden and accidental, which can easily cause damage to life and property. The scour analysis during the service period of the bridge needs to rely on testing methods, but Currently there is no reliable online scour monitoring system and method

Method used

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  • Magnetic field-based pier scour monitoring system and monitoring method
  • Magnetic field-based pier scour monitoring system and monitoring method
  • Magnetic field-based pier scour monitoring system and monitoring method

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Embodiment 1

[0041] This embodiment is a monitoring system, such as figure 1 As shown, the monitoring system includes a scour sensing stone 3, a full tensor magnetic field gradiometer 4 and a data processing system (not shown in the figure); The scour sensing stone 3 is a magnetic field emitting element, so it can emit a magnetic field; the full tensor magnetic field gradiometer 4 is located at a certain reference point on the water surface at the front side of the pier 1, and the full tensor magnetic field gradiometer 4 is used for Measure the magnetic field gradient tensor of the scouring sensing stone at the reference point; the data processing system calculates the distance from the scouring sensing stone to the reference point according to the magnetic field gradient tensor, and then calculates the scour depth of the pier, on this basis, Compared with the limit scour depth, the safety evaluation of the pier is carried out, and an early warning is given.

[0042] Such as figure 2As ...

Embodiment 2

[0046] The present embodiment is a monitoring method, comprising the steps of:

[0047] S1) Choose a reference point 1 meter away from the water surface on the front side of the pier. Considering the water level change, the reference point is set at different positions at different times. Record the distance from the reference point to the bridge deck, and arrange a full tensor magnetic field at the reference point. gradient meter;

[0048] S2) Calculate the rate of change of the magnetic induction intensity of the scour sensing stone at the reference point along the x-axis direction:

[0049]

[0050]

[0051]

[0052] B xA and B xB are the magnetic induction intensity in the x direction at A and B respectively, A and B are two three-axis magnetic field sensors respectively, and from B to A is the positive direction of the x axis; B yA and B yB are the magnetic induction intensity in the y direction at A and B respectively; B zA and B zB are the magnetic induct...

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Abstract

The invention discloses a magnetic field-based pier scour monitoring system and monitoring method. The monitoring system and monitoring method in the invention adopt a non-contact monitoring technology capable of penetrating rocks, soil, silt and water flow, have the advantages of being good in concealment, strong in adaptability, insusceptible to interference, convenient in layout and easy to measure, conducting monitoring during the operation of a bridge project, having no influence on the traffic and the like, meet the complex water environment of the bridge scour and the major needs of scour monitoring and protection, and solve the problems in scouring monitoring and early warning of piers under the complex water environment.

Description

technical field [0001] The invention relates to a bridge pier scour monitoring system and monitoring method based on a magnetic field. Background technique [0002] Traditional bridge scour depth measurement mainly relies on manual detection, but water operations seriously threaten the safety of inspectors, and the accuracy of measurement usually depends on the operating experience of inspectors. In the past two decades, bridge scour monitoring has gradually attracted the attention of researchers and scholars at home and abroad. The scour monitoring methods currently being used and gradually developed generally include sonar, radar, ultrasonic and other detection methods, and electromagnetic wave time domain reflectometry (Time Domain Reflectometry). , TDR), fiber Bragg grating and other on-line monitoring methods. Sonar and radar can determine the depth of sediment deposition and erosion. The detection device is easy to install and is generally used for scour inspection af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/26
CPCG01B7/26
Inventor 江胜华张冬兵孙伟贺宋韫皓李伟清鲍安红
Owner SOUTHWEST UNIVERSITY
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