地铁盾构管片预埋槽道防腐技术研究

发布时间：2019-01-01 07:48

【摘要】：地铁盾构管片预埋槽道因处在隧道封闭潮湿的环境中,加之有些地区因地材和水质原因,混凝土具有的一定强碱性,这对预埋槽道的防腐技术提出了一个更高的要求。但是国内至今也没有关于地铁盾构管片预埋槽道的国家技术标准,已使用或者正使用预埋槽道的地铁隧道工程中,设计对预埋槽道的绝缘、防腐能力要求过于笼统模糊,使其无法进行定量检测,从而难以保证其绝缘和防腐质量。通过工程实践以及理论研究,对地铁盾构管片预埋槽道的绝缘层、防腐层提出具体的技术指标和应用环境,以便指导预埋槽道的设计、制造和检测,并为建立国家规范提供技术支持。研究结论:在考虑地铁隧道杂散电流的情况下,预埋槽道绝缘封闭层应通过试验检测其绝缘性、阻燃性、软化点等9个指标来确定其性能,且采用绝缘层封闭层+铝锌多元合金共渗防腐是可行的。在不考虑地铁盾构隧道杂散电流的情况下,采用镍锌合金共渗防腐是可行的。
[Abstract]:The embedded tunnel of shield segment of subway is in the wet environment of tunnel closure, and in some areas because of the ground material and water quality, the concrete has a certain strong alkalinity, which puts forward a higher request to the anticorrosion technology of the pre-buried channel. However, there is no national technical standard on the embedded channel of shield segment in China. In the subway tunnel project where the tunnel is used or is being used, the requirements of anti-corrosion ability for the insulation of the pre-buried groove are too general and vague. It is difficult to ensure the insulation and anticorrosion quality because it can not be tested quantitatively. Through engineering practice and theoretical research, the concrete technical index and application environment of the insulation layer and anticorrosion layer of the shield segment pre-buried grooves are put forward in order to guide the design, manufacture and inspection of the pre-buried grooves. And for the establishment of national norms to provide technical support. Conclusion: when considering the stray current of subway tunnel, the performance of embedded channel insulator should be determined by testing its insulation, flame retardancy, softening point, etc. And it is feasible to use the insulator seal layer aluminum-zinc multi-alloy to prevent corrosion. Without considering the stray current of shield tunnel of subway, it is feasible to adopt nickel zinc alloy co-infiltrating anticorrosion.
【作者单位】：兰州市轨道交通有限公司;甘肃省轨道交通力学应用工程实验室;
【分类号】：U231.3;U455.43

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