A New Type of Railway Tunnel Lining Jumbo with Grouting through Molds
(1 Engineering Management Center, China Railway Corporation, Beijing 100844; 2 China Railway 11th Bureau Group Co. Ltd., Wuhan 430061; 3 Construction Quality & Safety Supervision Department, China Railway Corporation, Beijing 100844)
Abstract:
In order to address quality defects of lining voids, cracking or spalling that occur in operating tunnels, and based on the practices of casting concrete by lining jumbos on site, a conventional tunnel lining jumbo is renovated and new technology is proposed for grouting of the secondary lining with molds . The stubborn void defects existing in conventional secondary linings are solved by injecting the micro-expansion retarded mortar, characterized by good workability and early-strengthening, through an embedded RPC pipe, which improves the quality of the tunnel lining and provides a solid support for safe tunnel operation in the future.
GONG Cheng-Ming- 1 Zhu-Jia-Bin- 2 Dai-Hong-Ming- 3
.A New Type of Railway Tunnel Lining Jumbo with Grouting through Molds[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(4): 185-188