Three-dimensional space torsion box type main arch structure

The utility model discloses a three-dimensional space torsion box type main arch structure, which belongs to the technical field of bridge arch bridge structures, and comprises a main arch rib, the main arch rib comprises side arch ribs and a middle arch rib which are arranged on two sides of the end part of a main arch rib bridge, and the main arch rib is linearly transited from an arch end quadrilateral section to a pentagonal section with an inclined arch crown. A wind bracing assembly is further arranged on the bridge, the wind bracing assembly comprises a first wind bracing rigidly connected between the middle arch and the side arch, and a second wind bracing is arranged between the main arches in the middle arch rib; linear transition of sections of all arch point positions (from the arch end to the arch top area section) is adopted, rectangular sections perpendicular to a bridge floor are adopted at the arch end and the arch section, inclined pentagonal sections are adopted at the arch top and the arch