Arch bridge reinforcing method based on corrugated steel plate

The invention discloses an arch bridge reinforcing method based on a corrugated steel plate. The arch bridge reinforcing method comprises the following steps that A, an original retaining wall of a bridge opening is removed, so that a soil body on the wall of the bridge opening is exposed; B, an arched metal surface layer made of a corrugated steel plate is installed in the bridge opening, and a filling gap is formed between the metal surface layer and the soil body of the wall of the bridge opening; and C, concrete is poured into the filling gap to form a concrete inner layer connecting the metal surface layer and the soil body together, the metal surface layer and the concrete inner layer form a new bridge opening protection wall, and in the concrete pouring process, the metal surface layer forms a pouring formwork and a formwork support. According to the arch bridge reinforcing method based on the corrugated steel plate, the earthwork excavation amount is small in the road closing time period during constr