Submerged bridge pile foundation scouring real-time monitoring system and monitoring method thereof

Abstract

The invention discloses a submerged bridge pile foundation scouring real-time monitoring system and a monitoring method thereof. A data processing system is arranged at the top of a pier. A fiber bragg grating seepage pressure microsensor is arranged on the surface of the outer wall, located under the water, of the pier. A sunk block is arranged at the position, close to the pile foundation, of a river bed at the bottom of the pile foundation. A monitoring guide beam is fixedly arranged on the sunk block. A limiting device used for preventing the monitoring guide beam from moving in the radial direction is arranged in the middle of the pier. A fiber bragg grating seepage pressure microsensor and a set of fiber bragg grating pressure sensors are arranged at the lower end of the monitoring guide beam. The submerged bridge pile foundation scouring real-time monitoring system and the monitoring method thereof have the beneficial effects that the monitoring system and method are suitable for monitoring pile side pressure changes caused by scouring and water pressure changes caused by water level fluctuation near the underground pile foundation in real time, thus, the influences of pile side flow scouring and water level on pile foundation safety are obtained through analyzing, and the monitoring system and method have the advantages of high durability and precision, simple structure, real-time monitoring and easy engineering layout.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a real-time monitoring system and a monitoring method for scour of submerged bridge pile foundations. Background technique [0002] Bridges are an important part of highway and railway traffic. Its maintenance status directly affects the smooth flow of roads and driving safety. my country is a big country of bridges. Many bridges are located on rivers, lakes and seas. The pile foundations of bridges inevitably receive water flow. The continuous scouring of the water flow is the main factor causing the instability of the bridge piers. [0003] Underwater pile foundations of cross-sea and river-crossing bridges will be affected by water erosion, and soil erosion and silting changes on the pile side will occur, which will affect the soil pressure on the pile side and the safety of the pile foundation. Therefore, in recent years, how to observe the underwater foundation soil near...

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Problems solved by technology

However, these methods have different monitoring accuracy and different applicable conditions: First, these methods generally cannot be continuously tested in real time, and need to be observed regularly, and cannot eliminate the influence of complex reciprocating changes in the erosion and sediment layer. Only the depth change of the water-sediment interface does not take into account the density change of the sediment layer below the interface, so it is impossible to accurately determine whether the lateral soil pressure of the pile foundation has changed

Its measurement accuracy is also very susceptible to interference from external environments such as waves, and it needs to be constantly corrected to adapt to environmental changes in different waters, and the operation is complicated.

Second, this method cannot monitor the changes in earth pressure caused by the scour near the bridge pile foundation, and what is obtained is the evolution of large-scale underwater terrain scour, and the pile side is the blind spot of the test instead.

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