Large-diameter steel casing structure and butt joint installation method

The invention provides a large-diameter steel casing structure and a butt joint installation method, and relates to the technical field of water pile foundation construction devices.The large-diameter steel casing structure comprises a first steel casing, a second steel casing, a limiting mechanism and a wedge-shaped plate, and the second steel casing is arranged at the top of the first steel casing; a limiting mechanism is arranged at the end, facing the second steel casing, of the side wall of the first steel casing. The wedge-shaped plate is arranged between the second steel casing and the limiting mechanism and used for extruding the second steel casing to move towards the side away from the limiting mechanism through external force impact. The technical problems that in the prior art, when a steel casing is welded and installed, the welding quality is poor due to the fact that a connector is uneven, the butt welding time is long, and the construction efficiency is low are solved. 本发明提供一种大直径钢护筒结构及对接安装方法，涉