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首页> 外文会议>Pipeline Division Specialty Conference; 20050821-24; Houston,TX(US) >Correlation of Wire Breaks on Prestressed Concrete Cylinder Pipe with Predictions from Electromagnetic Testing
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Correlation of Wire Breaks on Prestressed Concrete Cylinder Pipe with Predictions from Electromagnetic Testing

机译：预应力混凝土筒管断线与电磁测试预测的相关性

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摘要

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：丹佛水务公司的94号管道由直径183厘米（72英寸）和168厘米（66英寸）的预应力混凝土嵌入式圆筒压力管（PCCP）组成。 PCCP管道从位于科罗拉多州莱克伍德的莫法特污水处理厂延伸到大约56大道和亚当斯县的华盛顿街，距离约17.5公里（10.9英里）。自安装以来，这条生产线经历了一场灾难性的故障。为了减轻进一步断裂的风险，使用常规的内部视觉和声音检查对管道进行状态评估，以检测处于初期故障状态的管道，并进行无损电磁测试以确定预应力钢丝破损的存在和数量。没有内部困扰迹象的管道。在四年内两次对94号导管进行了使用涡流/变压器耦合装置的电磁无损检测。各个管道上断线的数量估计范围从零到几百。除了对折断的预应力导线对使用寿命的影响进行结构分析外，还将管道中的管道打捞出来进行破坏性测试，以确定电磁测试结果的准确性。在每轮电磁测试之后，对管道进行打捞和解剖，以将实际的断线次数与无损测试预测的次数相关联。 94号导管的实际断线数量与无损测试预测的断线数量之间的相关性表明，电磁测试通常可以准确确定PCCP上断线的轴向位置，但是断线的量化不太精确。

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