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Shenzhen-Zhongshan Link is a magnificent cluster project integrating bridge, artificial island, immersed tunnel and under-water crossing interchange. The steel shell-concrete composite structure is adopted for subsea immersed tunnel for the first time in China, which is facing a technological gap in the entire industry chain. Based on the regulatory management on construction conditions of the project, we systematically elaborated the overall design of steel shell -concrete immersed tube tunnels in terms of technical standards, overall layout, tube element structure, self -compacting concrete material preparation and working performance, fire prevention system and corrosion protection system. Relevant experience can be used for industry reference. [ABSTRACT FROM AUTHOR]

We discussed the history, development drive, properties, mechanism, mixture design and quality inspection test of the self-consolidating concrete (SCC) . With the experience from the design and construction preparation of Hongkong- Zhuhai -Macao Bridge project immersed tunnel closure joint, we discussed the critical issue of SCC in the design and construction of immersed tunnel. The conclusion was drawn that as long as SCC is chosen, the SCC should not just be regarded as a material but as a construction technique, the design -construction contract allows the freedom of utilizing the SCC advantage. [ABSTRACT FROM AUTHOR]