Large-space steel structure crotch column bowl joint structure and manufacturing method thereof

The invention relates to a large-space steel structure crotch column bowl joint structure and a manufacturing method thereof. The bowl joint structure comprises a core tube, an upper annular plate, aplurality of brackets and a lower annular plate. The upper annular plate is fixedly arranged on the core tube in a sleeving manner, and the upper annular plate is in a circular truncated cone shape with the large top size and the small bottom size; the brackets are arranged at intervals along the periphery of the upper annular plate, and the brackets are fixedly connected with the upper annular plate and the core tube; and the lower annular plate is arranged on the core tube in a sleeving manner and located below the upper annular plate, the lower annular plate is in a circular truncated coneshape with the large top size and the small bottom size, and the lower annular plate is attached to the brackets and fixedly connected with the brackets and the core tube. According to the bowl jointstructure, the brackets are