Sand box for steel box girder

The utility model discloses a sand box for a steel box girder. The sand box comprises a steel jacket, a bottom plate, a wedge block and sand, the wedge blocks comprise a lower triangular wedge block and an upper triangular wedge block, adjusting screw rods are mounted in the upper triangular wedge block and the lower triangular wedge block through threads, fastening nuts are mounted on the adjusting screw rods, a sand box top plate is fixedly mounted at the upper parts of the wedge blocks, and a tetrafluoroethylene plate is arranged at the top of the sand box top plate; a plurality of threaded holes are formed in the lower portion of the steel outer sleeve, and adjusting bolts are installed in the threaded holes. According to the sand box for the steel box girder, a lifting structure with the wedge blocks and the screw rods is adopted, the upper triangular wedge blocks and the lower triangular wedge blocks can move mutually by adjusting the screw rods and the nuts, the installation elevation of the steel box