Experimental Study on Leakage Damage Monitoring of Liquid Filled Reinforced Concrete Pipeline

Nowadays, with the continuous development of industrialization, liquid-filled pipeline is the most representative pipeline transportation system. The damage forms of pipes with cracks will affect the mechanical properties of reinforced concrete pipes to varying degrees and make their properties decline. We investigated the undamaged, damaged and liquid-filled reinforced concrete pipelines, and analyzed the propagation mechanism of piezoelectric sensing signals in reinforced concrete pipelines. When the ultrasonic guided wave touches the damaged position, part of the ultrasonic guided wave will reflect, while the other part of the guided wave will continue to propagate through the damaged position, which is the reflection and transmission phenomenon of the ultrasonic guided wave. The damage assessment of pipeline structure can be realized by using the reflection and transmission phenomenon of ultrasonic guided wave. The signals of undamaged hollow pipe and undamaged liquid-filled pipe were compared and compared undamaged signal and damaged signal in liquid filled pipeline. Based on pulse-echo method, the influence of damage on signal propagation in liquid-filled pipeline is obtained.