以北京地下直径线盾构的刀盘改造竖井施工为例，针对复杂边界条件下大直径盾构刀盘改造异性结构竖井的设计及施工进行探讨，就如何保证竖井结构安全，同时又能合理协调盾构施工进行了实践探索，并给出了可靠的解决措施，取得了成功，为类似工程提供参考借鉴。

Taking vertical shaft construction of the cutter transformation of the Beijing underground diameter shield for example, the design and construction of cutter structure transformation under complex boundary conditions for large-diameter shield shaft were discussed. Practice about how to ensure the structural safety of the shaft as well as well-coordinated shield construction was explored, and reliable solutions were provided successfully, which can provide reference for similar projects.