The invention discloses a vertical shaft-
coupling throw searching technique for a large-scale
water turbine, and the technique comprises the steps: enabling a
water turbine and a generator
water turbine shaft (1) to achieve the vertical shaft
coupling with a generator shaft (2), and adjusting the concentricity through a vertical method, thereby reducing the deflection, caused by a horizontal type,of the shaft, and improving the alignment precision; employing a counter point uniform distribution steel wire suspending method, precisely measuring the concentricity, and eliminating the
system deviation through counter point measurement, thereby improving the precision; and reasonably setting an adjustment device at the external periphery of a shaft
coupling flange surface. The technique doesnot occupy equipment, is simple in operation, is reliable in precision, overcomes a difficulty in the vertical adjustment after the shaft coupling of the generator water
turbine shaft (1) and the generator shaft (2), improves the adjustment efficiency and precision, is novel, reasonable and simple, enables the
machining quality to be controllable, and is high in precision.