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国内外的实践经验证明,管子保护层的质量与管道的使用寿命有密切关系。保护层质量不好,管道在土壤中侵蚀性介质的作用下,环向预应力钢丝就会锈蚀甚至断裂,以致造成重大的管道破坏事故。我国在《预应力混凝土输水管》JC114—76中,对保护层的质量虽作了某些规定,但由于某些原因,至今也还没有制定出保护层质量的检验方法标准。在这样的情况下,各生产厂只能进行一些外观检查,而对其内部质量却无法了解。我们认为这是管道出现各种事故的“病灶”,是急待解决的薄弱环节。
The practical experience at home and abroad shows that the quality of the protective layer of the pipe is closely related to the service life of the pipe. The quality of the protective layer is not good. Under the action of aggressive media in the soil, the toroidal prestressed steel wire will rust or even break, resulting in a major pipeline damage accident. China’s “prestressed concrete water pipe” JC114-76, although some provisions have been made on the quality of the protective layer, but for some reason, so far has not formulated a test method for the quality of the protective layer. Under such circumstances, each production plant can only perform some visual inspections, but its internal quality cannot be understood. We think this is the “disease” of various accidents in the pipeline and is a weak link that needs to be resolved.