Combined steel box girder

The utility model provides a combined steel box girder, which belongs to the technical field of bridge engineering and comprises a steel box girder shell, a mounting groove is formed in the steel box girder shell, two web plates are arranged on the inner wall of one side of the mounting groove, one end of each web plate is fixedly connected with a bottom plate, and the other end of each web plate is fixedly connected with a bottom plate. The ends, close to each other, of the two web plates are fixedly connected with fixing plates, when the steel box girder shell is subjected to external acting force and pressure, the springs fixedly connected to the upper ends of the buffering plates conduct buffering, and then the pressure is distributed at the two ends of the bottom plate; and the acting force and the pressure are uniformly distributed in the device through a plurality of buffer columns fixedly connected to one end of the bottom plate, and the pressure can be better dispersed through the device, so that the