Assembling construction method for arch ribs of tied arch bridge

The invention relates to a method or a device exclusively used for erecting or assembling bridges, and to the field of general bridge technology. More specifically, the present invention relates to an assembling construction method for arch ribs of a tied arch bridge comprising the following steps: (1) constructing a box girder; (2) hoisting the arch ribs by means of transporting a crane A to a working surface and using the crane A to hoist sections of the arch ribs; (3) pumping concrete; (4) mounting and inspecting accessories; (5) coating the arch ribs. By coating with the last topcoat after appropriately adjusting a suspender force, only the crane A is needed for hoisting the arch ribs, so that a crane with a larger hoisting load on the ground for hoisting the sections of the arch ribs is not needed, and the hoisting height and hoisting distance of the crane are greatly reduced in the process of hoisting the sections of the arch ribs. In addition, because the crane A with a small hoisting load is used while hoisting the sections of the arch ribs and the crane with the larger hoisting load is only needed for hoisting the crane A, the ground trimming especially for the crane with the larger hoisting load is not needed, so that the construction cost is saved and the construction period is shortened.