Multi-line parallel pushing method for cross-channel large-span asymmetric steel box girder bridge

The invention relates to the technical field of steel box girder bridge pushing, in particular to a cross-channel large-span asymmetric steel box girder bridge multi-line parallel pushing method which comprises a downhill pushing construction technology, a temporary buttress setting construction technology, a steel pipe pile cofferdam and deep foundation pit bearing platform construction technology and a high column vase pier butt joint hoisting construction technology. The downhill incremental launching construction technology comprises incremental launching construction synchronous control and incremental launching linear control. According to the construction method, detailed construction steps of downhill pushing, temporary buttress arrangement, steel pipe pile cofferdam and deep foundation pit bearing platform and high-column vase pier butt joint hoisting, materials and process requirements are formulated, and uncertain conditions and countermeasures in the actual construction process are combined; rapid