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首页> 外文会议>Pipeline Division Specialty Conference; 20050821-24; Houston,TX(US) >Detection of Prestressed Concrete Cylinder Pipe Thinning From Hydrogen Sulfide Deterioration
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Detection of Prestressed Concrete Cylinder Pipe Thinning From Hydrogen Sulfide Deterioration

机译：硫化氢劣化对预应力混凝土圆柱管细化的检测

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摘要

In service evaluation of internal hydrogen sulfide deterioration of a 14.5 km (9 mile) long sewage force main constructed of 152 cm (60-inch) prestressed concrete cylinder pipe (PCCP) was conducted using sonic/ultrasonic resonant frequency data. One of the causes of concrete waste water pipe deterioration and failure is the thinning and weakening of concrete due to hydrogen sulfide generation at the high points of the line. In May 2003, it was reported that a large piece of sheet steel had been discovered on a bar screen at the wastewater treatment plant supplied by the 152 cm (60-inch) PCCP sewage force main. It was the second time in six months sheet steel had been recovered at the treatment facility. A current manufacturer of PCCP inspected the recovered piece of steel and confirmed that it appeared to be part of the steel cylinder from a large diameter PCCP. It was also reported that a large quantity of concrete and aggregate was being recovered at the sewage treatment plant and the upstream pump stations. The implications of the discovery of the sheet steel at the treatment facility are that the interior concrete core of the pipeline has completely deteriorated in places and the steel cylinder of one or more pieces of PCCP has corroded and dislodged from the pipe. It was probable that the deterioration of the pipeline was caused by hydrogen sulfide corrosion and that the pieces of steel cylinder came from the 152 cm (60-inch) PCCP sewage force main. Non-destructive stress wave measurements in the sonic/ultrasonic frequency range were made on the exterior of the pipe at excavated locations. The sonic/ultrasonic data is a direct measurement of the transmission velocity of both the compression and shear waves and the reflected phases of the compression wave from the inside face of the pipe. The transmission velocity values determine the elastic deformational characteristics of the concrete, including Young's, shear, and bulk moduli, Poisson's Ratio, and calculated strength values. The reflected signals resonate at a frequency that is related to the thickness and compression wave velocity of the concrete liner. Since the longitudinal velocity is measured directly and average thickness of the pipes are known, the average strength of the concrete pipe core as well as the presence of delaminations, spalls or pipe thinning can be determined from the measured resonant frequency. Structural analysis of the 152 cm (60-inch) PCCP was performed to determine the impact of pipe wall thickness reduction through hydrogen sulfide attack. This case study provides a summary of the non-destructive testing performed and the results of structural analysis of the 152 cm (60-inch) PCCP sewage force main.
机译：在服务评估中，使用声波/超声共振频率数据对由152厘米（60英寸）预应力混凝土圆筒管（PCCP）构成的14.5公里（9英里）长的排污管进行了内部硫化氢恶化的评估。混凝土废水管道劣化和故障的原因之一是由于在管线的高处产生硫化氢导致混凝土变薄和变弱。据报道，2003年5月，在由152厘米（60英寸）的PCCP排污管提供的废水处理厂的栅栏上发现了一块大钢板。这是六个月以来第二次在处理设施中回收钢板。当前PCCP的制造商检查了回收的钢片，并确认它似乎是大直径PCCP的钢瓶的一部分。另据报道，污水处理厂和上游泵站正在回收大量混凝土和骨料。在处理设施中发现钢板的含义是，管道的内部混凝土芯在某些地方已经完全变质，并且一个或多个PCCP的钢瓶已腐蚀并从管道上脱落。管道的损坏很可能是由于硫化氢腐蚀引起的，并且钢瓶的碎片来自152厘米（60英寸）的PCCP排污管。在开挖位置的管道外部进行了声音/超声波频率范围内的非破坏性应力波测量。声波/超声数据直接测量压缩波和剪切波的传输速度以及从管道内表面压缩波的反射相位。传输速度值确定混凝土的弹性变形特性，包括杨氏模量，剪切模量和体积模量，泊松比以及计算出的强度值。反射信号以与混凝土衬砌的厚度和压缩波速度有关的频率谐振。由于直接测量纵向速度并且已知管道的平均厚度，因此可以根据所测得的共振频率确定混凝土管芯的平均强度以及是否存在分层，剥落或管道变细。进行了152厘米（60英寸）PCCP的结构分析，以确定因硫化氢侵蚀而导致管壁厚度减小的影响。此案例研究总结了进行的无损检测以及152 cm（60英寸）PCCP排污管的结构分析结果。

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