Abstract: Herein, a case study is conducted on the No. 5 connecting passage project of the Haizhu Bay tunnel. Then a series of comprehensive construction technologies for a mechanized  connecting passage of a super-large diameter shield-tunnel are innovatively proposed. These technologies include: (1) A synchronous construction internal support auxiliary system: uniquely designed upper and lower force transmission support members connect the main tunnel segments, providing stable reaction force for the passage tunneling and reserve transportation space for synchronous construction. (2) Accurate grouting points and slurry: the ground grouting microreinforcement technology is used to enhance the soil strength. (3) A glass fiber and reinforced concrete composite lining segment structure: an inner cladding steel plate is set at key positions to relieve stress concentration. (4) Optimized shield launching and receiving processes to ensure construction safety. The engineering practice and monitoring analysis show that these technologies guarantee efficient synchronous construction of the main tunnel and the connecting passage, greatly improving the construction efficiency. The settlement and deformation of the surrounding environment and the main tunnel segments of the No. 5 connecting passage are within allowance. The maximum settlement of seriously-affected segment at pipe jacking machine launching end reaches －5.6 mm, and that at receiving end reaches －8.6 mm, indicating good overall deformation control effect.

Key words: super-large diameter shield tunnel, mechanized connecting passage, construction technology, construction monitoring