Waterproof structure of civil construction roof expansion joint

The waterproof structure of the civil construction roof expansion joint comprises a mounting frame, a push rod is movably connected to the outer side of the middle of the mounting frame, fixing pieces are arranged on the upper side and the lower side of the inner end of the push rod, the inner side surface of a rotating disc is connected with a connecting plate, and a fixing plate is fixedly installed at the inner end of the connecting plate; a fixing frame is mounted at the top of the upper end of the mounting frame, an extrusion spring is fixedly connected to the upper side of the interior of the inner frame, the lower surface of the extrusion spring is connected with the upper surface of a movable rod, connecting shafts are fixed to the left end and the right end of the movable rod, and the movable rod is connected with the lower end of a side plate through the connecting shafts; the middles of the side plates are fixed to the inner frame through connecting shafts, and baffles are arranged on the inner sid