Hoop device for butt welding of large-diameter pipelines

The hoop device comprises a circular ring body, a first groove is formed in the bottom end of the circular ring body, a supporting plate is fixedly connected to the bottom end of the circular ring body, a sliding sleeve is arranged in the first groove, one end of the sliding sleeve is connected with a sliding rod in a sliding mode, and the other end of the sliding rod is connected with a supporting rod. The end, away from the sliding sleeve, of the sliding rod is fixedly connected with the interior of the first groove, the outer wall of the sliding sleeve is fixedly connected with a connecting rod, and the end, away from the sliding sleeve, of the connecting rod is connected with a threaded rod through threads. The screw is arranged in the fixing block, the screw and the fixing block are added, so that the circular ring body can be adjusted in a self-adaptive mode, the threaded rod is added, the cube can move front and back, the stabilizing rod is added, the cube can drive the supporting plate to move, and th