Large-span special-section intersecting truss structure and installation method thereof

The invention relates to a large-span special-section intersecting truss structure and an installation method thereof. The whole large-span special-section intersecting truss structure is roughly rectangular, and comprises latticed columns, a main stressed truss, wing-modeled main trusses, reinforced-modeled secondary trusses, wing-modeled secondary trusses, cantilever main trusses, oblique combined cantilever main trusses, cantilever-discontinuous secondary trusses and connecting rods arranged among all the trusses. The large-span special-section intersecting truss structure and the installation method have the beneficial effects that a gradient adduction type space structure is adopted, the sizes of single secondary trusses at two sides of the main truss are gradient, the whole secondarytrusses are firstly converged and then widened in a horizontal direction, and are firstly widened and then converged in a longitudinal direction, and the secondary trusses are connected by using theconnecting rods; the stabl