Construction method for ultralarge-diameter shield synchronous grouting

The invention discloses a construction method for ultralarge-diameter shield synchronous grouting. The construction method comprises the following steps of: producing and preparing a slurry material, and conveying the slurry material to a shield construction working face in a tunnel; carrying out instant grouting on a building gap by using a grouting system in a shield excavation process; and treating a waste slurry material. Due to adoption of the construction method for ultralarge-diameter shield synchronous grouting, a synchronous grouting construction method which can play a favorable quality control effect can be achieved; and the construction method for ultralarge-diameter shield synchronous grouting has the characteristics of high construction efficiency, capability of protecting the surrounding environment and strong stability of a ring-forming tunnel structure.