Circular steel support structure

The utility model discloses a round steel tube supporting structure comprising a plurality of round steel tubes which are mutually fixed and connected to form the supporting structure, wherein the supporting structure is a pull rod structure which comprises three round steel tubes, a supporting and connecting pitch point plate and arc-shaped blocking plates, a long groove opening matched with the supporting and connecting pitch point plate is formed in the round steel tube I, the ends of the round steel tubes I, II and III, where the supporting and connecting pitch point plate passes through, are respectively arranged and fixed at the two ends of the supporting and connecting pitch point plate in a sleeve manner, and the arc-shaped blocking plates are arranged at the ends of the round steel tubes II and III, connected with two ends of the supporting and connecting pitch point plate. The steel structure round-tuber-shaped section is symmetrical, the section centroid is in coincidence with the shear center, and section moment of inertia for each axis is same; the section is closed, anti-torsion stiffness is big, plate member partial stability is good; the round steel tube supporting structure is simple and direct and smooth in appearance, bar members can be directly welded at a same point, pitch plates can be omitted, and steel material is saved; and compared with an open section, the round tube section has the advantages of being flat and neat in surface, free of dead angles, small in outer surface area, favorable for saving anti-corrosion and fireproof coating, and also favorable for dust removal.