老朽化PC管路の非破壊モニタリングに基づく漏水現象評価

抄録

Deterioration of existing PC pipeline systems could result in water leakage or dropping of pressure. In most cases, such non-destructive tests as a water leak detection method or a ground probing radar method are applied to identify leakage location in pipeline. Although these methods are effective for evaluation of limited sections, further technical improvement is necessary for wide-range and long-term measurements for maintenance of the existing pipelines. In this study, water-leak evaluation by Acoustic emission (AE) method and the material physical properties evaluation have been conducted at the existing PC pipeline. AE behaviors at leaked section of the pipeline are different from those of sound portion. AE activity in water-leak section is high, and water leak and environmental noise can be distinguished by AE parameter analysis. A relation between AE rate and inner water pressure is analyzed by the rate process theory. It is realized that AE activity is closely associated with to water leakage in water-leakaged pipeline.