LNG transport ship rudder sleeve installation method

The invention relates to an LNG transport ship rudder sleeve installation method. The method features that a rudder nacelle is hoisted integrally with a rudder sleeve, and the rudder sleeve is reduceby space restriction and is easier to hoist. Installation of positioning rudder sleeve on the ship bench eliminates positioning of the rudder centerline on the segments and avoids secondary positioning and inspection; By fixing the rudder sleeve in the rudder engine room and overlaying the groove in the rudder engine room, the workload caused by the accumulated deviation of the rudder sleeve in the rudder engine room can be reduced, the work at height can be reduced, and the construction environment can be improved. As that assembly gap between the surfacing groove and the weld seam is not more than 2mm and the joint misalignment is adjusted by the fire work industry, As that saw-tooth shape horse plate is adopted for reinforce and positioning, and the welding sequence is adopted, the welding fil amount can be red