Air pipe installation method for narrow air shaft

The invention discloses an air pipe installation method for a narrow air shaft. The method comprises the steps that S1, surveying and setting-out are conducted, and a floor support is fixed; s2, a temporary operation plate is laid on the lowest floor support of the air pipe; s3, fixing the lifting appliance; s4, the air pipes are assembled in a segmented mode, specifically, a lifting appliance is started, and the first air pipe is lifted; s5, after the pipeline descends in place, an air pipe needs to be adjusted immediately, the perpendicularity requirement is met, temporary fixing is carried out, construction is carried out according to the supporting mode of the pipeline in the pipe well, welded and corrected supports are fixed to the inner wall of the vertical shaft through expansion bolts, the distance between the supports is not larger than 3 m, and the supports are arranged from bottom to top; adjusting the positions of a horizontal pipeline elbow and a vertical pipe joint according to a pipeline drawin