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Comparison of Two Electromagnetic Techniques to Determine the Physical Condition of PCCP

机译:两种确定PCCP物理条件的电磁技术的比较

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摘要

The use of electromagnetic techniques for the inspection and determination of distress (broken wires) for Prestressed Concrete Cylinder Pipe (PCCP) has greatly increased over the past 7 years. There are two primary providers of these services that use generically similar methods. Individually the results from each provider have been investigated with mixed results. Direct comparison of results between the two providers and confirmation of the results by excavation had not been performed before. As part of an AWWA Research Foundation study (Romer, 2004), comparisons of the results between the two electromagnetic inspection providers were made on several PCCP pipelines. Correlation between the two electromagnetic inspection results was modest. However, excavation for direct physical examination of the pipes to verify the predicted distress, or lack of distress, was not possible at the time of the electromagnetic inspections. The opportunity to directly compare and confirm the accuracy of inferred prestressing wire damage was finally possible on one of the San Diego County Water Authority's (Water Authority) pipelines. Both providers of electromagnetic inspection services had surveyed the same segment of the pipeline with differing results. Direct comparison of electromagnetic results with actual observed distress has been determined at several locations. This paper reviews the results and documents the predicted electromagnetic results along with the observed physical condition of the pipe sections and emphasizes the importance of proper records and the utilization of other impact factors that affect the performance.
机译:在过去的7年中,使用电磁技术检查和确定预应力混凝土圆柱管(PCCP)的遇险(断线)已大大增加。这些服务的两个主要提供者使用大致相似的方法。单独调查了每个提供商的结果,并得出了不同的结果。之前从未进行过两个提供者之间结果的直接比较以及通过挖掘对结果的确认。作为AWWA研究基金会研究的一部分(Romer,2004年),在几个PCCP管道上对两个电磁检测提供者之间的结果进行了比较。两次电磁检测结果之间的相关性很小。但是,在进行电磁检查时,无法对管道进行直接的物理检查以验证预期的遇险或遇险情况,而无法进行挖掘。最终有可能在圣地亚哥县水务局(水务局)的一条管道上直接比较和确认推断的预应力导线损坏的准确性。两家电磁检测服务提供商都对管道的同一部分进行了调查,结果不同。已经在几个位置确定了电磁结果与实际观察到的遇险情况的直接比较。本文对结果进行了回顾,并记录了预测的电磁结果以及所观察到的管道截面的物理状况,并强调了正确记录和利用影响性能的其他影响因素的重要性。

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