Shear ring and steel sheath thereof

The utility model discloses a shear ring and a steel protective sleeve thereof, the shear ring comprises a plurality of annular body units, each annular body unit is composed of at least two semi-annular bodies located on the same annular surface, and a first interval is arranged between every two adjacent semi-annular bodies; the first intervals of every two adjacent annular body units are arranged in a staggered mode, and the multiple annular body units are arranged in the axial direction of the steel protective sleeve body. The shear ring structure can reduce steel consumption, and meanwhile the arrangement form of the shear ring structure can improve the bearing capacity and the transverse deformation capacity of the steel casing; excessive friction cannot be generated on the side faceof the shear ring in the drilling process of a drill bit and the descending process of a reinforcement cage, and meanwhile the mud clamping situation of the upper side and the lower side of the shearring in the grouting and