Assembly type base layer structure of square column wrapped by I-shaped steel and installation method of assembly type base layer structure

The invention discloses an assembly type base layer structure of a square column wrapped by I-shaped steel and an installation method thereof.The assembly type base layer structure comprises the I-shaped steel, a square conversion piece, a U-shaped plate and a right-angle edge closing plate, the I-shaped steel comprises a connecting plate in the middle and wing plates on the two sides of the connecting plate, and two clamping parts are arranged on each wing plate; the square conversion pieces are arranged on clamping parts of wing plates of the I-shaped steel, the U-shaped plates are connected between the connected square conversion pieces, and the right-angle edge closing plates are arranged between the adjacent U-shaped plates, so that the I-shaped steel is assembled into a square column-shaped structure. The problem that in a steel structure building, I-shaped steel wraps a square column is solved, the foundation structure technology of the fabricated I-shaped steel column wrapping the square column is com