Abstract

Polyvinyl chloride (PVC) sewer pipes have operated for decades in a hostile environment, raising concern among sewer managers over the longevity of their drainage systems. Inspection data (CCTV and Panoramo®) reveals that severe defects have already surfaced, yet it is unknown if the material properties of PVC sewers have been affected. In order to address this issue, extensive testing (among others flexural and tensile tests, FT-IR, X-ray, viscosity measurements) was conducted on eight exhumed PVC sewer pipes (16–43 years old) with known defects and one brand-new for reference purposes. Visual examination during excavation revealed various failure causes, including uncontrolled handling of the pipes during construction or due to digging activities in the direct vicinity of the pipes. The test results indicate that physical ageing is extensively detected while other degradation mechanisms had minimal or no effect on the investigated pipes. However, mechanical testing on exhumed 3-layer pipes show that the incorporation of layered wall constructions is potentially a critical factor for the structural status of the pipe.

摘要

聚氯乙烯 (PVC) 下水道管道已经在恶劣的环境中运行了数十年，这引起了下水道管理人员对其排水系统寿命的担忧。检查数据（CCTV 和 Panoramo®）显示严重缺陷已经浮出水面，但 PVC 下水道的材料性能是否受到影响尚不清楚。为了解决这个问题，对 8 个已知缺陷的挖掘出来的 PVC 下水道管道（16-43 岁）和一个品牌进行了广泛的测试（其中包括弯曲和拉伸测试、FT-IR、X 射线、粘度测量）。新的供参考。挖掘过程中的目视检查发现了各种故障原因，包括施工期间对管道的失控处理或管道附近的挖掘活动。测试结果表明，物理老化被广泛检测，而其他退化机制对所研究的管道影响很小或没有影响。然而，对挖掘出的 3 层管道进行的机械测试表明，分层壁结构的结合可能是影响管道结构状态的关键因素。