通过对北京铁路地下直径线2标工程的研究，确定在刀盘改造期间进行负环管片拆除的一系列工作，重点如部分反力架的拆除方法、负环管片的详细拆除方法以及拆除反力架后临时支撑的架设方法，同时就泥水盾构隧道的换装技术进行了叙述，最终在7 d之内成功拆除了7环负环管片，节约了工期，保证了后继施工的材料运输速度。

Through introducing the construction method of negative ring demolition during transforming cutter head and replacement technique of Beijing Rail Transit Line 2 bid section in detail, the experience of negative ring demolition and replacement techniques of large diameter slurry shield were summarized, which would provide reference to the implementation of the construction scheme.