Steel bracket system and installation method thereof

The invention relates to a steel bracket system. The steel bracket system comprises a viaduct bearing platform, an inverted trapezoidal force bearing bracket, two main girders, and a plurality of distribution beams, wherein the inverted trapezoidal force bearing bracket is installed on the viaduct bearing platform, the two main girders are arranged on the top end of the inverted trapezoidal forcebearing bracket in an erected mode, and the distribution beams are arranged on the two main girders in an erected mode. The front and back sides of each main girder are connected with webs in a weldedmode. As an optimization, the inverted trapezoidal force bearing bracket comprises a combination of two rows of vertical supports and oblique supports. The vertical supports are fixedly connected with one another through connecting rods, and the vertical supports are fixedly connected with the diagonal supports by connecting rods. Diagonal bridging is connected between the adjacent vertical supports. The invention further