Lining air pipe structure of concrete air shaft

The utility model relates to a lining air pipe structure of a concrete air shaft, which is suitable for the technical field of building ventilation engineering. The lining air pipe structure is provided with a plurality of air pipe steel plates installed on the inner wall of the concrete air shaft, the air pipe steel plates in the radial direction of the concrete air shaft are spliced end to end to form a closed structure, the air pipe steel plates in the axial direction of the concrete air shaft are sequentially spliced up and down, and the splicing positions of every two adjacent air pipe steel plates are connected through spot welding. Fireproof sealant is smeared on a gap at the splicing position, and the lining air pipe is formed through splicing. The structural strength of the lining air pipe is improved by arranging channel steel for supporting and reinforcing at special-shaped irregular positions of the concrete air shaft and installing angle steel on each air pipe steel plate for reinforcing. The air