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本文着重介绍板金工展开非标准管件斜防水套管的计算方法和绘图方法，这种情况在给排水设计圆形井筒泵房时经常会遇到。本计算方法尤其适用于作现场施工图设计时，在缺乏有关的参考资料，推导计算公式又很费时间的情况下。笔者通过多年施工图设计的实践，将上述计算方法和绘图方法作了归纳总结，并编制成计算程序，供同行参考应用。
This article focuses on the calculation method and drawing method for the non-standard pipe oblique waterproofing casing commenced by Banjingong. This situation is often encountered when designing a circular wellbore pumping station for water supply and drainage. This calculation method is especially suitable for the design of on-site construction drawings, in the absence of relevant reference materials, and the derivation of the calculation formula is time-consuming. Through years of practice in the design of construction drawings, the author summarized the above calculation methods and drawing methods, and compiled them into calculation programs for peer reference applications.