Installation method for round supporting barrel

The invention provides an installation method for a round supporting barrel. The round supporting barrel and main hull segments are included. A hull is divided into the multiple main hull segments. The hull is constructed and manufactured through a segmental construction method, and the round supporting barrel is installed after main hull segment construction is finished. Hull segmental manufacturing, round supporting barrel site inspection, slipway final assembly, round supporting barrel installation line determination, round supporting barrel lifting, and positioning alignment are sequentially conducted, and then installation work of the round supporting barrel is finished. By the adoption of the above manner, the construction steps are greatly simplified, a construction period is shortened, and the installation accuracy of the round supporting barrel is improved.