Hoisting construction method for large-cantilever wing-spreading steel box girder

The invention relates to a hoisting construction method for a cantilever wing spreading steel box girder. The hoisting construction method comprises the following specific steps: step 1, construction preparation; secondly, steel pipe piles and abutment piers are constructed; 3, temporary support construction; fourthly, the steel box girder is hoisted and installed; 5, the cantilever steel box girder is hoisted and installed; 6, linearly adjusting the steel box girder; seventhly, prestress tensioning construction is conducted in the hanging steel box on the top of the steel-concrete combined section; eighthly, the temporary supports and the steel pipe piles are dismantled and constructed; and ninthly, construction is completed, inspection and acceptance are conducted, and equipment and machines are dismantled and returned. The invention belongs to the field of bridge engineering construction, and not only can improve the stability of a temporary support structure, the installation precision of a steel box gird