Abstract: In traditional secondary lining, problems on honeycomb surface, cracks, void behind the arch and falling blocks always exist. Hence, a secondary lining construction method that uses assembled tunnel arch and its corresponding construction trolley design scheme are demonstrated for Hujiagou tunnel in the east ring line of the Chongqing railway hub. Moreover, the longitudinal sealing schemes for sidewall pouring of the trolley are compared to obtain design scheme for the formwork trolley in three different lining structures. Three main trolley structures in the scheme are similar and share the support, hydraulic, walking, sideformwork, and auxiliary systems, which can be modified at low cost according to different lining structures. The theoretical research demonstrates that the adoption of new method reduces the defects of lining arch cast by integral pouring and eliminates many hidden dangers of driving, which helps in saving pouring time and improving concrete liningconstruction efficiency.

Key words: railway tunnel, secondary lining construction, arch lining assembly technology, lining trolley design