Abstract
This paper highlights the planning, design and construction of 4 km of 600 mm-, 1200 mmand 1800 mm-diameter trunk sewers, using slurry operated tunnel boring machines, in highly variable ground conditions in two busy urban areas. This was the first time that curved alignment tunnels have been constructed in Hong Kong, with one segment having an S-curve alignment (404 m long). The project also included tunnelling through, and being received in, already constructed permanent shafts, also a first for such a construction technique in Hong Kong. The problems encountered and the solutions provided were also discussed. The paper should be read in conjunction with Part II: Performance of Works, Lessons Learned and Improvements Proposed.
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