Fireproof composite air pipe and connecting structure thereof

The utility model belongs to the technical field of mechanical and electrical installation engineering, and particularly relates to a fire-resistant composite air pipe and a connecting structure thereof. A pipe body of the composite air pipe is of a composite structure and sequentially comprises an inner-layer color steel plate, a fire-proof heat insulation layer and an outer-layer color steel plate from inside to outside; wherein the inner-layer color steel plate and the outer-layer color steel plate are respectively bonded with the fireproof heat-insulating layer through high-temperature glue, and connecting flanges are respectively arranged at the end parts of the two sides of the composite air pipe. The fire-resistant composite air pipe has the advantages that the fire-resistant limit of the fire-resistant composite air pipe can reach more than 2 hours, the fire-resistant limit requirement is met, the installation space is greatly saved, the cost, the energy consumption and the materials are saved, the st