Bridge rectangular pier hanging die construction method

The invention provides a bridge rectangular pier hanging die construction method. Four hanging die brackets are manufactured in advance according to the size of a pier body, each hanging die bracket comprises at least two triangular supports, crossbeams are arranged at the upper portions of all the triangular supports, platform panels are laid on the crossbeams, and climbing cone holes are preformed in the triangular supports. Starting from concrete pouring of the first section of a rectangular pier, climbing cones are embedded in all sections of the pier body, a formwork is detached after the first section of the pier body is poured, the four hanging die brackets are installed on the four walls of the rectangular pier, the formwork is supported on the hanging die brackets, concrete of the second section is poured, after pouring is finished, the formwork and the hanging die brackets are detached, the whole hanging die brackets are hung to the second section of the pier body, the formwork is installed on the h