常压更换刀具换刀程序和改进方案

介绍南京长江隧道项目盾构机常压更换刀具的换刀程序，该换刀方法适用于直径较大且进行了特殊设计的盾构机，详细阐述常压更换刀具的拆卸步骤、操作方法和注意事项。为了便于在常压下检查刀具固定螺栓的连接情况，对常压更换刀具设计提出了改进意见。对具备常压更换刀具功能的盾构机在常压下检查、更换刀具具有借鉴意义。

Procedure of Replacing of Cutting Teeth under Atmospheric Pressure and Its Optimization

The procedure of replacing cutting teeth under atmospheric pressure executed in the boring of Nanjing Yangtze River Tunnel is presented. The method is applicable to large-diameter shields with such special design features. The replacing steps and methods and the items to which attention should be paid are described in detail. The design of the cutting teeth that are to be replaced under atmospheric pressure is optimized in order to facilitate the checking of the connection of the fixing bolts of the cutting teeth under atmospheric pressure. The paper can be served as reference for similar eases in the future.