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探讨如何确定镇墩纵向位移和镇支墩垂直位移的允许变形值和观测精度指标问题，提出从管道伸缩节结构对镇支墩沉降差的实际承受能力出发计算管道镇支墩允许位移值及观测精度指标的理论、方法和公式。
This paper discusses how to determine the allowable deformation value and the observation accuracy index of the vertical displacement of the pier and the vertical displacement of the pier. Proposed to calculate the allowable displacement and observation of the pier of the pipe town based on the actual bearing capacity of the expansion joint structure of the pipe branch. The theory, method and formula of precision index.