Steel trestle capable of resisting flood buoyancy impact and construction method of steel trestle

The invention relates to a steel trestle capable of resisting floodflow buoyancy impact and a construction method of the steel trestle, and belongs to the technical field of building construction.The steel trestle comprises steel pipe piles, friction sand, a steel frame, bailey beams, transverse profile steel beams, longitudinal profile steel beams and a bridge deck steel plate, the steel pipe piles are arranged at intervals, and the bottom ends of the steel pipe piles are embedded into pile holes of an underground rock stratum; gaps between the outer sides of the steel pipe piles and pile holes are filled with the friction sand materials, the steel frames are fixedly installed at the top ends of the steel pipe piles, the bailey beams are arranged at intervals and fixedly installed on the steel frames, the transverse profile steel beams are fixedly installed on the bailey beams, the longitudinal profile steel beams are erected on the transverse profile steel beams, and the steel pipes are fixedly installed on