Round-top and square-bottom construction technology for waste heat recovery ventilation pipeline

The invention relates to the technical field of pipeline machining application, in particular to a round-top and square-bottom construction technology for a waste heat recovery ventilation pipeline. The round-top and square-bottom construction technology comprises the following effective steps of a, cutting a plate; b, bending an arc-shaped sample plate; c, constructing an assembly platform; d, assembling and supporting local flanges; e, welding a triangular plate piece; f, setting an internal support; g, mounting the arc-shaped sample plate; h, integral welding; and i, obtaining a finished product. An existing construction technology is improved and matched with a unique supporting tool, stable supporting of a large-diameter round-top and square-bottom pipe in the machining process is effectively achieved, meanwhile, the supporting tool is arranged in a matched mode, the construction efficiency is improved, and therefore, the technical problems existing in the construction of the existing large-diameter roun