预应力混凝土圆筒管（PCCP）和其他结构中预应力钢丝的腐蚀是负责这些设施的业主和管理人员普遍关注的问题。管道和预应力钢丝的一般不易接近性使得评估变得困难、昂贵，而且往往不确定。通过开挖或对管壁进行内部检查，对预应力钢丝进行随机检查，仅提供了预应力钢丝状况的局部知识。本文介绍了一种连续声学监测系统的开发、测试、应用和结果，该系统用于检测和定位马里兰州霍华德县公共工程部拥有和运营的约6000英尺42英寸预应力混凝土管道中的腐蚀诱发故障。安装了SoundPrint声学监测系统，以评估和分析该管道和其他关键饮用水管道的状况。 讨论了评估结果和随后的开挖，以确认系统测量到的劣化。这项技术的前提是，当张紧的电线发生故障时，其储存的能量会突然释放，从而在结构中产生动态响应。监控系统利用连接在长电缆上并安装在管道内的声学传感器。这些传感器检测结构中不同点的断线响应。通过基于现场的数据采集系统处理数据，消除了最不相关的环境活动。符合预设标准的事件被记录下来，并通过互联网传输到中央处理设施，在那里使用专有处理软件生成报告，总结记录事件的时间、位置和分类。长期声学监测可以提供有关管道劣化的性质和程度的全面信息，从而降低成本- 可以做出有效的管理决策。包括3个参考文献、表格、图表。

Corrosion of prestressing wire in prestressed concrete cylinder pipe (PCCP) andother structures is a widespread concern for owners and managers responsible forthese facilities. The general inaccessibility of the pipe and prestressing wiremakes evaluation difficult, costly and often inconclusive. Random examination ofprestressing wires by excavating or internal inspection of the pipe wall givesonly a very localized knowledge of the prestressing wire condition. This paperdescribes the development, testing, application and results of a continuousacoustic monitoring system used to detect and locate corrosion-induced failuresin approximately 6000 feet of 42-inch prestressed concrete pipe owned andoperated by Howard County, Maryland, Department of Public Works. A SoundPrintacoustic monitoring system was installed to assess and analyze the condition ofthis and other critical potable water conduits. The results of this evaluationand subsequent excavation to confirm deterioration measured by the system arediscussed. This technology works on the premise that when a tensioned wire fails,its stored energy is released suddenly, causing a dynamic response in thestructure. The monitoring system utilizes acoustic sensors connected on a longcable and installed inside the pipeline. These sensors detect the response of awire break at different points in the structure. Processing of data by thesite-based data acquisition system eliminates most irrelevant ambient activity.Events that meet pre-set criteria are recorded and transmitted over the Internetto a central processing facility where proprietary processing software is used togenerate reports summarizing the time, location and classification of recordedevents. Long-term acoustic monitoring can provide comprehensive information aboutthe nature and extent of pipeline deterioration so that informed andcost-effective management decisions can be made. Includes 3 references, table, figures.