Research on Surveying Technology of Special-shaped Immersed Tube Installation in Hong Kong NSL Tunnel

The advantages of immersed tunnel are shallow depth and large cross-section. Victoria Bay is spanned by the NSL tunnel in Hong Kong. Kowloon and Hong Kong Island are connected. The tunnel consists 11 immersed tubes. Based on the study of the establishment of the coordinate system of special-shaped tube joints, the establishment and calibration of attitude surveying system, and the calibration of RTK-GPS, a set of surveying system for the installation and joint of special-shaped immersed tubes is developed to solve the problem in the construction of NSL tunnel. The installation of the E10 is guided. Compared with the traditional total station survey method, the installation and joint surveying system can meet the accuracy requirements and can be extended to similar immersed tunnel projects in the future.

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