Immersed tube tunnel is the main structural form of cross-sea channel,the waterproof and tightness of immersed tube joints are crucial,which directly affects the safety and durability of the whole life of the project.OMEGA waterstop is the second waterproof device of the tube joint,its installation surface space is narrow,the working space is limited,and it has significant cross impact with other construction in the tunnel.Combined with the Shenzhen-Zhongshan Link immersed tube tunnel engineering,this paper introduces the OMEGA waterstop installation and construction technology in confined space of large steel shell immersed tunnel.This technology has the advantages of simple construction,flexible operation,high construction efficiency,and low impact on other processes.It can provide reference and experience for the installation of waterstops in pipe gallery structures such as immersed tunnels,underwater open-cut tunnels,and metro projects in the future.
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