Long-distance curve steel pipe internal penetration construction method

The invention relates to the technical field of steel pipe internal penetration construction, and discloses a long-distance curve steel pipe internal penetration construction method. The method comprises the following construction steps that S1, original pipe internal investigation and measurement are conducted, specifically, a pipeline is measured and scanned through CCTV endoscopic and 3D scanning equipment, a cross section is measured every 5m, the bottom elevation, the axis and longitudinal deformation of the pipeline are measured, a pipeline diagram is drawn, and the internal structure ofa pipe cavity of the pipeline, deformation of a pipe joint (a bell and spigot) and the pipeline trend axis condition after the pipeline stops running are observed and known; S2, preparation before internal penetration steel pipe mounting is conducted, specifically, underground pipelines are detected, the position of a working well is determined, equipment machines are mounted, and the interior ofthe pipeline is cleaned;