The invention provides a replacing method of shield
tail brushes of a super-large-
diameter shield machine under a high
water pressure condition. In the propelling process of last ring
pipe pieces before shutdown, in addition to the last ring
pipe piece before shutdown, gaps between a shield
tail and the
pipe pieces is filled with elastic water absorbing materials or elastic waterproof materials; in the propelling process of the last ring pipe pieces before shutdown, ordinary
grease is injected into a
grease cavity of the shield
tail brushes in a pressure mode, and the other
grease cavities of other shield tail brushes of the super-large-
diameter shield machine are injected with waterproof grease in a pressure mode; in the replacement position, a
mud tank of the super-large-
diameter shield machine is subjected to new
slurry replacement; and in the replacement position, a shield shell hoop of the super-large-diameter shield
machine is injected with filling
slurry body in a pressure mode. Preferably, the shield tail brushes are detachable. According to the replacing method of the shield tail brushes of the super-large-diameter shield
machine under the high
water pressure condition, replacement of the shield tail brushes under the high
water pressure condition is easy, safe, stable and efficient, the problem that replacement of the shield tail brushes of the super-large-diameter shield
machine under the high water pressure condition is difficult can be solved, design is ingenious, construction is simple, convenient, safe and efficient, and large-scale application and promotion is adaptable.