Micro-tremor measurement based bridge pier scour monitoring system and method

Abstract

The invention discloses a micro-tremor measurement based bridge pier scour monitoring system. The micro-tremor measurement based bridge pier scour monitoring system comprises a fixed micro-seismograph probe installed at the top end of a bridge pier, a guide rail vertically installed on the upstream face of the bridge pier and provided with a portion under the water surface, a movable micro-seismograph probe vertically moving along the guide rail, a micro-seismograph mainframe receiving micro-tremor information detected by the fixed micro-seismograph probe and the movable micro-seismograph probe, and a data processing system for processing the micro-tremor information into bridge pier scour depth and early warning bridge pier scour. The micro-tremor information monitored by a micro-seismograph is processed into the bridge pier scour depth by the data processing system, early warning is performed on the bridge pier, and the micro-tremor measurement based bridge pier scour monitoring system is high in accuracy and long in service life. The invention further discloses a micro-tremor measurement based bridge pier scour monitoring method. The micro-tremor measurement based bridge pier scour monitoring method calculates the bridge pier scour depth based on the micro-tremor information, and a calculation result is accurate and reliable.

Description

technical field [0001] The invention relates to the field of bridge safety monitoring, in particular to a bridge pier scour monitoring system and monitoring method based on geopulsation measurement. Background technique [0002] With the change of hydrological phenomena, the damage of bridge scouring to bridges is sudden and accidental, which can easily cause damage to life and property. The scouring analysis of bridges during service needs to rely on testing methods. [0003] 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 ...

AI Technical Summary

Problems solved by technology

Sonar and radar can determine the depth of sedimentation and scouring. The detection device is easy to install and is generally used for scouring inspection after a flood. However, the signal quality of sonar and radar is very easily affected by sediment particles or aquatic plants. During this period, when the water flow contains a large amount of sediment and other suspended matter, the monitoring signal is severely attenuated, and the measurement accuracy is greatly reduced. The same disadvantage exists for ultrasonic waves; on the other hand, because the testing and compilation of sonar and radar signals are very complicated, Requires skilled professional operators

When TDR is applied to bridge scour monitoring, the scour can be sensed by deformation or even destruction of the cable at the corresponding part through scour, but it is easy to cause signal distortion and affect the measurement results. In addition, the fiber grating is combined with a specific cantilever beam or other rods, and the arrangement In the riverbed near the bridge pier, although the fiber grating can directly or indirectly sense the earth pressure change caused by the erosion of sediment, this method is difficult to operate in the harsh service environment, and there are difficulties in quantification

As a kind of scour monitoring technology, underwater buoys and magnetic positioning rings lack a long-term effective and active service cycle because they fail to monitor the scour at the corresponding position

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