Railway tunnel anchoring section secondary lining construction method and turtle shell type steel formwork thereof

The invention belongs to the related technical field of railway tunnel construction, and discloses a railway tunnel anchoring section secondary lining construction method which comprises the following steps: measuring and setting out two ends of a to-be-constructed railway tunnel anchoring section secondary lining at an annular interval; a combined turtle shell type steel formwork and a lower anchor section lining are adopted for overall matched construction, the steel formwork is of a turtle shell type structure formed by jointly splicing a plurality of modular assemblies of different specifications, and the steel formwork is spliced with a profile steel frame as a foundation; after the steel formworks are integrally assembled, umbrella-shaped temporary supports are erected on the steel formworks, then the profile steel frames are dismantled, longitudinal beams are installed, and necessary clearance adjusting operation is executed; and the steel formwork and the anchor section lining are integrally poured an