Variable arc steel moulding plate for arch crown of dam gallery

The utility model relates to a variable arc steel moulding plate for the arch crown of a dam gallery, which comprises two vertical columns. A steel arch frame is installed above the two vertical columns; a plurality of variable arc steel deck plates are installed on the upper surface of the steel arch frame; the variable arc steel deck plates are connected through U-shaped clips; the steel arch frame comprises an arch ring and a supporting rod welded with the arch ring; the contact positions between a longitudinal rib plate in the center of each variable arc steel deck plate and transverse rib plates at the left and right parts of each variable arc steel deck plate are not welded; and the two vertical columns are telescopic. The variable arc steel moulding plate for the arch crown of a dam gallery has simple structure, is convenient for operation, overcomes the disadvantages that a timber formwork is easy to be deformed, the number of turnover times is less and the cost is high, is processed at one step and can be repeatedly used, is beneficial to environmental protection, reduces the construction cost and has little influence on the traffic in a gallery, wherein all the components are made of steel materials.