Combined-type grouting sleeve connecting structure and steel bar connecting construction method

The invention discloses a combined-type grouting sleeve connecting structure and a steel bar connecting construction method. The combined-type grouting sleeve connecting structure comprises a verticalsleeve body; an upper steel bar and a lower steel bar are inserted from the two ends of the sleeve body correspondingly; a plurality of bulged annular inner ribs are arranged on the inner wall of thesleeve body in the axial direction at intervals; a grouting hole and a slurry discharging hole which penetrate through the sleeve body are formed in the upper end and the lower end of the sleeve body; the ends, in the sleeve body, of the upper steel bar and the lower steel bar are connected with horizontal end plates correspondingly, and the diameter of the end plates is larger than the inner diameter of the annular inner ribs; the two end plates are located between any two of the adjacent annular inner ribs; and the sleeve body is of a two-half separable structure split by the plane passingthrough the axis of the sle