为适应水底隧道盾构法技术的大深度化施工需求，通过研究带压换刀装置、超高水压条件下常压进入刀盘轮幅的常压换刀装置、超高水压作业设备的配置、超高水压进舱换刀开挖面透气控制标准与降低开挖面透气性的措施、超高水压作业程序、超高水压换刀压缩气体压力确定及超高水压作业模式的确定等，以解决超高水压条件下刀具检查与更换的技术难题。得出饱和气体盾构进舱换刀的作业原理与饱和气体潜水作业基本相同，具有实施的可能性。

Devices to replace cutting tools under pressure, devices to replace cutting tools from inside the cutterhead spokes with atmospheric pressure under the condition of ultrahigh pressure, configuration of equipment needed for operation under ultrahigh pressure, control standard for air permeability of tunnel face under ultrahigh pressure needed to access into the working chamber and replace the cutting tools, countermeasures to reduce the air permeability of the tunnel face, procedure of operation under ultrahigh water pressure, determination of the pressure of the compressed air needed to replace the cutting tools under ultrahigh water pressure and determination of modes of operation under ultrahigh water pressure are studied, in order to solve the technological difficulties in the inspection and replacement of the cutting tools in shield tunneling under ultrahigh water pressure. Conclusions are drawn that the operation principle of accessing into the working chamber and replacing the cutting tools under saturated air is similar to that of diving under saturated air and that the technologies presented in the paper are feasible. 