Steel box girder installation and construction method for crossing existing high-speed short-time traffic interruption implementation

The invention relates to the technical field of high-speed construction, in particular to a method for installing and constructing a steel box girder across existing high-speed short-time traffic interruption, which comprises the following steps of: S1, before processing and manufacturing the steel box girder, strictly inspecting and measuring a construction site; especially for the plane position and width of the existing high-speed medial strip, the plane positions of wave-shaped guardrails on the two sides of the road and the terrain elevation; s2, according to the measured data, carrying out steel box girder longitudinal segment division on the steel box girder bridge, and numbering and arranging; s3, after longitudinal segments of the steel box girder are divided and determined, each segment is decomposed into a plurality of transverse unit bodies, and the transverse unit bodies are numbered and arranged; s4, installing a temporary support at the medial strip of the existing expressway; and S5, mounting