Fabricated gate-type steel structure

The utility model relates to the technical field of steel structures, in particular to an assembly type door-type steel structure which comprises a door-type steel frame, a supporting frame is fixedly connected to the bottom end of the door-type steel frame, movable grooves are formed in the two sides of the inner wall of the supporting frame, and folding frames are rotationally connected to the inner side walls of the movable grooves. The inner side wall of the supporting frame is fixedly connected with a supporting rod, one end of the folding frame is fixedly connected with a rotating gear, and the outer wall of one end of the folding frame is sleeved with a sleeve box. Through the arrangement of bolts, rotating grooves, rotating gears, spring blocks and movable grooves, a worker can rotate the bolts in threaded connection with the interiors of the rotating grooves, the bolts can extrude the spring blocks, the spring blocks can slide to drive the two rotating gears to slide, and the rotating gears slide to