在旧线路改造工程施工过程中，由于设计要求需将原线路的转角塔改造成带构架的换位塔施工。本文将以梨合1号线75#转角塔改造施工为例，阐述改造施工方法、施工注意事项及利用CAD软件计算复杂引流线的长度。%In the construction process of old line renovation project, due to the design requirements, the corner tower of original line should be transformed into transposition tower with architecture. With the case of renovation construction of Lihe No.1 Line 75 # corner tower, this paper describes the renovation method, construction precautions and uses CAD software to calculate the length of complex drainage line.
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