Abstract: Problems, i.e. cavity behind crown, insufficient thickness of lining and crown spalling, exist in secondary lining of railway tunnel. As a result, the technical schemes, i.e. combination of concrete prefabrication technology and castinplace technology, precast segment used in secondary lining arch, and the castinplace concrete used in the other parts of secondary lining, are put forward. And the Lshaped joint concrete lining formwork trolley is developed. The structure and design of the trolley are introduced in detail, the design scheme and parameters are determined, and the field application of the trolley in Hujiagou Tunnel of East Ring Line of Chongqing Railway Terminal is briefly described. The use of the trolley can shorten the construction period, reduce the number of construction personnel, and solve the problem of crown spalling.

Key words: railway tunnel, crown spalling, Lshaped joint concrete formwork, precast segment, castinplace on side, lining trolley, structural design