Wrapping composite fireproof structure for square steel tube concrete combined column

The invention discloses a wrapping composite fireproof structure for a square steel tube concrete combined column. The wrapping composite fireproof structure comprises a flexible fireproof inner layerand a single-layer fireproof plate arranged on the outer side of the flexible fireproof inner layer. The single-layer fireproof plate and the flexible fireproof inner layer are fixed to light steel keels. The light steel keels comprise the inter-column light steel keels and the column end light steel keels. Each inter-column light steel keel is fixed between every two adjacent column limbs of thecombined column. The fixing faces of the sides of fireproof layers formed by the inter-column light steel keels are flush with the side faces of the column limbs of the combined column. The fixing faces of the ends of fireproof layers formed by the column end light steel keels are parallel to the end faces of the combined column. The flexible fireproof inner layer is flat attached to and wraps the periphery of the combine