The invention discloses a method for installing a
rudder horn. The method comprises the following steps: a, preparing an inverted-manufactured
rudder horn-steering gear room platform subsection combined member; b, completing the
welding operation of a main
stern section, and after the main
stern section is turned over, erecting and positioning the main
stern section, and determining a subsection baseline surface; c, arranging a strengthening structure between a main
deck and a steering gear room platform, then arranging an opening on the main
deck; d, arranging an opening on a part (at which the
rudder horn is arranged) of a
hull baseplate, and carrying out rounded corner and surrounding structure strengthening on the opening of the baseplate; e, hoisting the erected rudder horn-steering gear room platform subsection combined member from the main
deck, so that the rudder horn-steering gear room platform subsection combined member is hoisted from the main deck to the the composite member is below the rudder horn, then enabling the composite member to get out the opening of the baseplate; and f,
welding the subsections of the steering gear room platform with other subsections. In the invention, through performing a rudder horn installation process in advance, the shipbuilding period is shortened, the accurate installation of the rudder horn is realized, the cost is reduced, and the efficiency is improved.