Hoisting method for steel box beam pieces of river-crossing double-layer multi-amplitude bridge

The invention provides a hoisting method for steel box beam pieces of a river-crossing double-layer multi-amplitude bridge. The hoisting method includes the following steps that firstly, steel box beams are transported to the position between solid piers on a river way through a steel box beam transport ship; and secondly, cranes are arranged on both shores of the river way and used for hoisting the steel box beams to the solid piers or a cover beam from the steel box beam transport ship. By means of the steps, hoisting of the steel box beam pieces of the river-crossing bridge is achieved. Foundation treatment is carried out on crane traveling areas on the outer sides of the solid piers and includes the steps that excavation and earth-rock mixture backfill are carried out on foundations in the crane traveling areas, layered rolling is carried out, and earth-rock mixture backfill layers are formed; and a plain concrete layer which is 15-20 cm thick is laid on each earth-rock mixture backfill layer, and foundat