Square steel pipe column internal reinforcement structure achieving full bolted connection and construction method of square steel pipe column internal reinforcement structure

The invention discloses a square steel pipe column internal reinforcement structure achieving full bolted connection and a construction method of the square steel pipe column internal reinforcement structure. Two sets of bolt holes are machined in each of the connecting joint and an internal reinforcer of a square steel pipe column, anchoring segments of necking bolts are inserted into the sixth sets of bolt holes, the inserting depth is adjusted, and the length of exposed necking segments is larger than the thickness of the internal reinforcer; then the internal reinforcer is pushed to the connecting joint in the axial direction of the square steel pipe column; when open long round holes of the internal reinforcer arrive at the necking segments and are inserted into the necking segments,the necking segments achieve the limiting function, and the internal reinforcer is located; the necking bolts are screwed outwards, and an internal reinforcing segment is clamped and fixed by the anchoring segments; and the f