Combined formwork system structure for cast-in-place box girder through few-support method

The invention provides a few-support-method cast-in-place box girder combined formwork system structure which comprises steel pipe piles arranged on the ground in a driving mode, pile top longitudinal beams are arranged on the tops of the steel pipe piles, pile top cross beams are vertically arranged on the tops of the pile top longitudinal beams, bailey beams are vertically arranged on the tops of the pile top cross beams, and the bailey beams are vertically arranged on the tops of the steel pipe piles. Distribution beams are vertically and evenly laid on the tops of the bailey beams, bowl buckle frames are arranged on the tops of the distribution beams, the top ends of the bowl buckle frames are matched with bottom arc lines of the box beams, longitudinal and transverse sole timbers are arranged on the tops of the bowl buckle frames, and box beam formworks are arranged on the tops of the longitudinal and transverse sole timbers. According to the method, the steel pipe piles driven on the ground serve as sup