A monitoring method based on a cubic bridge foundation scour safety monitoring device

Abstract

The invention discloses a monitoring method of a cubic scouring safety monitoring device for a bridge foundation. The monitoring method comprises the following steps (1) making preparation before monitoring; (2) monitoring change data of the water pressure; (3) monitoring change data of the soil pressure and the water pressure; (4) monitoring change data of the water temperature; (5) monitoring change data of a caisson; and (6) analyzing the monitoring data. The monitoring method has the beneficial effects that calculation is carried out according to the relation between the initial burial depth of the caisson and a weight needing to be additionally added into the caisson, so that it is ensured that the caisson adaptively tracks a bearing stratum; and a fiber bragg grating osmometer, a fiber bragg grating pressure sensor and an optical fiber gyroscope are arranged on the surface of the caisson so that the depth change of a scouring pit, the thickness change of a back-silting soil layerand the water level change caused by the tidal action can be monitored in real time.

Description

technical field [0001] The invention relates to the technical field of bridge measurement, in particular to a monitoring method based on a cubic bridge foundation scour safety monitoring device. Background technique [0002] The disturbance of the bridge pile foundation to the water flow causes the water flow to partially scour the riverbed around the bridge piers. Scouring can not only endanger the safety of upstream and downstream buildings and nearby embankments, but also cause water damage to the bridge piers themselves. The water damage of bridge pile foundation caused by local scour is sudden and catastrophic, and often causes great losses to people's lives and property. [0003] In recent years, with the rapid development of bridge structural health monitoring technology, many technical methods for real-time monitoring of bridge pile foundation scour have been born. However, these technical methods have different monitoring accuracy and different applicable conditions...

AI Technical Summary

Problems solved by technology

The disadvantage of ground penetrating radar scour monitoring technology is that it is greatly affected by the noise formed by multiple radiations from the foundation and the riverbed surface, and the scour monitoring effect on the riverbed surface in waters with a water depth greater than 10m is not good.

In particular, the inability to penetrate conductive materials makes it not only impossible to complete the scour monitoring of cohesive soil riverbeds and waters with high salinity, but also difficult to monitor the return silt that has similar electrical characteristics to the bed surface sediment.

The disadvantage of echosounding scour monitoring technology is that whether it is fixed or mobile, the accuracy of echosounding scour addition is easily affected by water depth, water temperature and salinity, sediment concentration and the complexity of underwater terrain, and mobile The echo sounding scour monitoring method is also easily affected by multiple factors such as installation errors, ship attitude measurement errors, and time delay errors.

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