Construction method of square-sleeved circular steel tube stiff concrete column

The invention relates to a construction method of a square-sleeved circular steel tube stiff concrete column. Comprising the steps of construction of a concrete foundation bearing platform, shaping machining and hoisting of the steel pipe stiff column, positioning and installation of the steel pipe stiff column, installation of a steel reinforcement framework on the periphery of the steel pipe stiff column, installation of a square column formwork on the periphery of the steel pipe stiff column, installation of an outer hoop laitance collecting device, internal and external integrated pouring of the high-throwing self-compacting steel pipe stiff concrete column and concrete curing. The device has the beneficial effects that accurate positioning and mounting of the steel pipe stiff column are achieved through the devices such as the annular groove, the steel plate belt positioning ring, the positioning rib plate and the level bubble; a high-throwing self-compacting concrete technology is adopted, and integrate