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Correlation of Wire Breaks on Prestressed Concrete Cylinder Pipe with Predictions from Electromagnetic Testing

机译：电磁试验预测预应力混凝土缸管丝断裂的相关性

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Denver Water's Conduit No. 94 consists of 183 cm (72inch) and 168 cm (66-inch) diameter prestressed concrete embedded cylinder pressure pipe (PCCP). The PCCP conduit extends from the Moffat Treatment Plant located in Lakewood, Colorado a distance of approximately 17.5 km (10.9 miles) to 56th Avenue and Washington Street in Adams County. Since its installation, the line experienced one catastrophic failure. In order to mitigate the risk of further breaks, condition assessment of the pipeline was conducted using conventional internal visual and sounding inspection to detect pipe in a state of incipient failure as well as nondestructive electromagnetic testing to determine the presence and quantity of broken prestress wires on pipes that showed no internal signs of distress. Electromagnetic non-destructive testing using eddy current/transformer coupling devices was performed on the Conduit No. 94 pipeline twice within four years. Estimates of the number of broken wires on individual pipes ranged from zero to several hundred. In addition to structural analysis of the impact of broken prestress wires on serviceability, pipes were salvaged from the pipeline for destructive testing to determine the accuracy of the electromagnetic test results. After each round of electromagnetic testing, pipes were salvaged and dissected to correlate the actual number of wire breaks with the number predicted by the non-destructive testing. Correlations between the actual number of wire breaks from the Conduit No. 94 pipe dissections and the number of wire breaks predicted by the non-destructive testing indicate that the electromagnetic testing is generally accurate in determining the axial location of broken wires on PCCP, but that quantification of the wire breaks is less precise.
机译：丹佛水的导管No.94由183厘米（72英寸）和168厘米（66英寸）直径预应力混凝土嵌入式气缸压力管（PCCP）组成。 PCCP导管从位于科罗拉多州Lakewood的Moffat治疗设备延伸，距离Adams County的第56 km（10.9英里）至第56 km（10.9英里）至第56大道和华盛顿街。自安装以来，该线路经历了一个灾难性的失败。为了减轻进一步破裂的风险，使用常规内部视觉和探测检查对管道进行条件评估，以检测初期失败状态的管道以及非破坏性电磁测试，以确定破坏预应力导线的存在和数量管道显示没有内部痛苦的迹象。使用涡流/变压器耦合器件的电磁非破坏性测试在4年内在导管No.94管道上进行两次。估计各个管道上断线的数量范围从零到几百个。除了对Prestress电线对可维护性的影响的结构分析外，管道从管道中挽救了破坏性测试，以确定电磁试验结果的准确性。在每一轮电磁检测后，挽救管道并解剖，以将实际的线断裂数与未破坏性测试预测的数量相关联。来自导管No.94管道解剖的实际线断裂之间的相关性和由非破坏性测试预测的线断裂的数量表明电磁检测通常准确地确定在PCCP上的断线的轴向位置，但是线断裂的量化较低。

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