Concrete-filled steel tube pile-column integrated structure and construction method

The invention discloses a concrete-filled steel tube pile-column integrated structure and a construction method. Threads are welded to the outer wall of a steel tube of a concrete-filled steel tube pile, the lower end of the pile is manufactured into a pointed cone shape according to design requirements, the pile is screwed into a foundation in the mode that matched equipment applies axial force and torque to the top of the pile at the same time, an outer sleeve is connected with the pile in a lower structure and a column in an upper structure through threaded connection at the position of the connecting portion of the pile and the column, all components of the pile-column integrated construction are prefabricated in a segmented mode, and mechanical installation is achieved. The position of the connecting portion of the pile and the column is generally subjected to large bending moment and is a weak link, the pile-column integrated connection has important engineering significance, secondary connection betwee