Key Construction Technology Of The Immersed Tunnel On FenJiang Road South Extension FoShan City

With the development of technology，Immersed tunnel attracted more attention aroundthe world and play an more and more important role in the transport. Immersed tunnel is amultidisciplinary, high-tech construction. Relative to the bridge and other forms of underwatertunnel it has unique advantages. Immersed tunnel method is widely used in construction, andcontinue to deepen and improve. In the development of modern science and technologydriven, many advanced scientific and technological achievements have been applied to theimmersed tunnel construction, immersed tunnel towards the versatile, adaptable andstandardized other aspects of development.Foshan City Fenjiang Road South Extension Tunnel Is currently the largest combinedhighway and railway immersed tunnel in China. Its techniques and methods have somerepresentation in some aspect. This paper analyzed and summarized some key technologiesfor construction. According to the principle of dry dock options, paper describes the variousforms and features of dry dock，comparative analysis of their advantages, disadvantages andapplicability, select large dry dock built next for the project combined with the actualconditions of the project; through the concrete severe controlled, element size precisioncontrol and crack control to improve the quality of element prefabricated; through analysisvarious processes and methods of foundation trench excavation and installation of elementsinking, select underwater blasting and two floating crane for the project combined duration,cost, quality and other requirements; in addition, paper analyzed and summarized constructiontechnology of foundation trench、the final joint and other key aspects, study methods andresponse measures to solve construction focus, difficult and key technology, to provides auseful reference for follow-up immersed tunnel construction.