Shield launching water stop system under geological condition of water-rich sand layer

The utility model belongs to the technical field of shield launching of tunnel excavation, and particularly relates to a shield launching water stop system under the geological condition of a water-rich sand layer. The device comprises an underground continuous wall arranged on the outer side of a station enclosure structure, a three-axis stirring pile reinforcing body is arranged on one side of the underground continuous wall in the shield tunneling direction, and an RJP high-pressure jet grouting pile reinforcing body is arranged between the three-axis stirring pile reinforcing body and theunderground continuous wall; four rows of the three-axis stirring pile reinforcing bodies close to the underground diaphragm wall and the row on the outermost circle are connected in a sealed mode toform a waterproof curtain, and a plurality of dewatering wells are distributed on the outer side of the three-axis stirring pile reinforcing bodies and the outer side of the underground diaphragm wall. In shield launching and