Walking type multipoint pushing construction method and walking type multipoint pushing construction system for steel box girder

The invention discloses a walking type multipoint pushing construction method for a steel box girder, which is an improved optimized scheme for improving the disadvantages of a pulling type pushing method. The optimized scheme comprises the steps of installing pushing devices at assembly platforms, temporary mounds, main mounds and other points, firstly jacking the steel box girder with a vertical jack to separate the steel box girder from a girder laying frame, then pushing the steel box girder for a stroke in the longitudinal direction by a pushing jack, lowering the steel box girder to the girder laying frame, retracting the pushing jack for a next stroke of pushing, and keeping the circulation of the work until the installation of the steel box girder is finished. The pushing construction method for the steel box girder provided by the invention adopts a multipoint walking type pushing system, which not only can avoid disadvantages in the process in prior arts, but also has the advantages that the horizontal force at the mound top is greatly reduced; the structure of the temporary mound is simplified; the damage to the steel box girder is small; the construction cost is low and the like.