Inverted trapezoidal bent cap formwork used in cooperation with pier column and method

The invention provides an inverted trapezoidal bent cap formwork used in cooperation with a pier column and a method. The inverted trapezoidal capping beam formwork used in cooperation with the pier column comprises a pier column main body, and a supporting forming module mechanism is arranged on the pier column main body; the supporting and forming module mechanism comprises a first mounting block, a rectangular injection port, two storage grooves, two switching assemblies and two supporting assemblies, the first mounting block is arranged on the top of the pier column main body, the rectangular injection port is formed in the top of the first mounting block, the rectangular injection port is matched with the pier column main body, and the two storage grooves are formed in the top of the first mounting block; the two storage grooves are formed in the inner walls of the two sides of the rectangular injection opening correspondingly. The inverted trapezoidal capping beam formwork used in cooperation with the p