Arch rib mounting method of continuous rigid frame arch bridge

The invention relates to an arch rib installation method of a continuous rigid frame arch bridge, and relates to the technical field of bridge construction, and the arch rib installation method comprises the following steps: S1, prefabricating a plurality of assembly bracket assemblies with different heights according to the design line type of the rigid frame arch bridge; S2, a plurality of assembling support assemblies are vertically fixed to the beam face of the rigid frame arch bridge, and a plurality of sections of radians consistent with the design line type of the rigid frame arch bridge are formed at the tops of the assembling support assemblies; s3, the arch ribs are hoisted to the position above the assembling support assembly section by section, and an in-situ assembling sectionand a lifting assembling section are formed; and S4, the lifting assembly section is lifted and assembled with the in-situ assembly section in a butt joint mode, and the rigid frame arch bridge is formed. According to the ar