Arch rib of reinforced concrete arch bridge and erection support and manufacture method of arch rib

The invention discloses an arch rib of a reinforced concrete arch rib, an erection support and a manufacture method of the arch rib. The manufacture method can be applied to manufacture and erection of the arch rib of conventional reinforced concrete bridge and the arch rib of a reinforced concrete tied-arch bridge, and can improve the stability of an arch rib support during erecting the arch rib and after erecting and positioning the arch rib, as well as ensuring the safety in erecting of the arch rib. The arch rib disclosed by the invention comprises an arch rib body; a thrust switching support saddle is arranged in a position, corresponding to the arch rib support, of the arch rib body. The erection support is provided with an I-shaped support body, and the upper end surface of the erection support is a horizontal plane; and the support body is welded at the top part of the arch rib support and is in horizontal contact with a bottom plate of the thrust switching support saddle. The manufacture method of the arch rib comprises the following steps in sequence: pouring concrete in positions, corresponding to the arch rib support, at two ends of the arch rib body in order to fix embedded steel bars; marking a vertical line which is only formed after the arch rib main body is erected on the arch rib body before the erection is carried out; and welding the bottom plate with the lower ends of the embedded steel bars. By adopting the manufacture method, the safety in construction can be improved, and the risk in construction can be avoided.