Inner supporting structure at large-diameter shield tunnel segment opening

The utility model relates to the technical field of building construction, in particular to an inner supporting structure at an opening of a large-diameter shield tunnel segment, a fixed base is arranged at the lower end of the interior of an annular support, a transverse support is arranged on the side edge of the fixed base in parallel, and a vertical support is vertically arranged on the fixed base. The vertical support and the transverse support are fixedly connected through the inclined support, and meanwhile the vertical support, the inclined support and the transverse support are all arranged in the annular support. The steel supports and the steel pipe pieces are arranged as main supporting components, so that the whole device can be detached and repeatedly used, the construction concept of environment protection is met, meanwhile, the annular support is tightly attached to the inner diameter of the shield lining, the fixed base and the supports in different directions are arranged in the annular supp