Construction method for large-span steel pipe arch rib by adopting bending instead of curve

The invention relates to a construction method for a steel pipe arch rib by adopting bending instead of curve, in particular to a construction method for a large-span steel pipe arch rib by adopting bending instead of curve. According to the method, the steel pipe arch rib is decomposed into short straight sections, and the straight sections are welded and adjusted into a curve according to the lofting linearity. The manufacturing process of replacing curve with bending is adopted, the axis of the chord pipe basically coincides with the design axis, the material performance of the steel pipe arch rib is guaranteed, the construction procedure is simplified, and the construction period is effectively shortened. No safety, quality and environmental protection accidents occur in the steel pipe arch rib machining and installing period, the steel pipe arch rib is good in linearity, the catenary is within the allowable error range, and the construction progress meets the plan requirement. 本发明涉及基础设施领域中拱桥钢管拱肋以折代曲施工方法，