Installation method of high-speed rail simply-supported box girder steel mould system

The invention provides an installation method for a high-speed rail simply-supported box girder steel mould system. The installation scheme comprises the steps that 1, a corresponding girder manufacturing pedestal is arranged according to the size of a box girder; 2, a box girder outer mold is installed on the girder manufacturing pedestal; 3, the whole box girder reinforcement cage is hoisted into the box girder outer mold, the reinforcement cage is provided with a hollow inner cavity, and the box girder inner mold is installed in the hollow inner cavity of the reinforcement cage; 4, end molds of the box girder are installed on the two sides of the reinforcement cage; 5, a flexible sliding way is laid in the hollow inner cavity of the reinforcement cage; a plurality of inner sliding frames are fed into the hollow inner cavity of the reinforcement cage, the inner sliding frames slide to set positions on the flexible sliding ways, and the inner sliding frames and the end molds are fixed together; 6, the flexib