Construction method of combined high-clearance large-span variable cross-section roof structure

The invention discloses a construction method of a combined high-clearance large-span variable cross-section roof structure, the roof structure is an irregular curved surface building, the whole roof structure is triangular, two base angles are respectively a high-clearance structure unit and a large-span structure unit, and a vertex angle is a variable cross-section structure unit. A first skylight unit, a second skylight unit, a central area unit and the like are arranged among the units; the construction area and the closure area of each unit are defined through division of each area, and the high-clearance structure unit, the large-span structure unit and the variable cross-section structure unit are firstly constructed and then are closed at the skylight; construction is facilitated, and a construction site is reasonably planned; through the arrangement of the high-clearance structure unit, the combined beam system is a large-span beam body, the variable cross section is arranged, ...