Abstract The Shenzhen-Zhongshan Link is a super-scale sea-crossing cluster project integrating "bridge, island, tunnel, and underwater interchange," and it is the first immersed tunnel to adopt the steel shell and concrete combined structure in China. The project confronts numerous technical challenges such as the lack of design standards,high precision required for steel shell manufacturing, difficulties in casting and quality inspection of self-compacting concrete in elements, long distances for tube floating transport, and complex construction environment for immersed tunnels. Based on a thorough analysis of key scientific and technical issues faced by the Shenzhen-Zhongshan Link project, this paper delves into various challenging aspects including new structure type and design method for steel shell concrete immersed tube tunnel, long-term durability protection for steel structure, steel shell fabrication, selfcompacting concrete preparation, intelligent casting and inspection technology, digital construction technology for immersed tunnel, key structure and construction method for the final closure joint monolithically launched in the sea, monitoring and precision forecasting system for tunnel construction environment, and structural fire prevention and control. The paper aims to summarize the main technical achievements and provide references for the design and construction of similar river and sea-crossing tunnel projects in the future.
Abstract：
The Shenzhen-Zhongshan Link is a super-scale sea-crossing cluster project integrating "bridge, island, tunnel, and underwater interchange," and it is the first immersed tunnel to adopt the steel shell and concrete combined structure in China. The project confronts numerous technical challenges such as the lack of design standards,high precision required for steel shell manufacturing, difficulties in casting and quality inspection of self-compacting concrete in elements, long distances for tube floating transport, and complex construction environment for immersed tunnels. Based on a thorough analysis of key scientific and technical issues faced by the Shenzhen-Zhongshan Link project, this paper delves into various challenging aspects including new structure type and design method for steel shell concrete immersed tube tunnel, long-term durability protection for steel structure, steel shell fabrication, selfcompacting concrete preparation, intelligent casting and inspection technology, digital construction technology for immersed tunnel, key structure and construction method for the final closure joint monolithically launched in the sea, monitoring and precision forecasting system for tunnel construction environment, and structural fire prevention and control. The paper aims to summarize the main technical achievements and provide references for the design and construction of similar river and sea-crossing tunnel projects in the future.
DENG Xiaohua1 CHEN Weile2,
3 SONG Shenyou2,
3 WU Yugang1 LIU Jian2 JIN Wenliang2 CHEN Yue2
.Key Technologies for the Construction of the Shenzhen-Zhongshan Link Steel Shell Concrete Immersed Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(2): 203-213
2024, Vol. 61 