The HC Bracket for bridges is used for building the flanges or central slabs of composite-structure bridges on site, whether they have metal or prefabricated concrete girders. The system is formed of modular formwork and a number of auxiliary components which allow for it to be fixed to the bridge girders. The fittings that fix the formwork to the girders may remain embedded in the concrete or may be recoverable, depending on the length and characteristics of the bridge.