Self-anchored suspension bridge navigation hole crossing steel box girder construction method

The invention relates to a self-anchored suspension bridge navigation hole crossing steel box girder construction method, which belongs to the technical field of bridge construction, and comprises the following steps: S1, erecting a temporary support, and arranging an anti-collision pier near the temporary support of a navigation hole; s2, a pushing section steel box girder is erected by the floating crane in a segmented mode, and pushing of the pushing section of the steel box girder is conducted through a walking type pushing device; s3, mounting brackets at the two ends of the steel box girder section are hoisted; s4, a steel box girder section is hoisted by a floating crane from the girder transporting ship, the girder section is moved to the position above the position to be installed through a hinge anchor, and the floating crane lowers the girder section till the bottom of the girder is 20 cm higher than the top of the girder falling cushion block; s5, the three-way jack is jacked to make contact with