Partial prefabricated reinforcing structure of existing H-shaped steel column and construction process thereof

The invention discloses a partial prefabricated reinforcing structure of an existing H-shaped steel column. The structure comprises the existing H-shaped steel column, prefabricated concrete sections,horizontal pull rods and a grouting material. The plurality of prefabricated concrete sections are stacked one by one in two semi-closed cavities defined by flanges and a web of the existing H-shapedsteel column; the horizontal pull rods are arranged in the longitudinal direction of the existing H-shaped steel column at a certain interval, and the two ends of the horizontal pull rods are respectively welded with the two flanges of the existing H-shaped steel column; a formwork is adopted to wrap the existing H-shaped steel column, and then the grouting material is filled with the gaps between the H-shaped steel column and the prefabricated concrete sections; and after the formwork is removed, partial prefabricated reinforcing columns are formed. The invention further discloses a construction process of the partial prefabricated reinforcing structure of the existing H-shaped steel column. The prefabricated concrete sections are convenient for industrial production and high in construction efficiency; and the grouting material can combine the prefabricated concrete sections and the existing H-shaped steel column into a whole, so that the bearing capacity of an original component isremarkably improved.