首页|Tunnelling and Pipejacking Techniques for Trenchless Installation of Drainage Pipelines
Tunnelling and Pipejacking Techniques for Trenchless Installation of Drainage Pipelines
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NSTL
Hong Kong, a city on hilly natural terrain, with a total area of 1,000 square kilometres, has a population of 7 million. Its developments mainly concentrate in 20% of the flat land in the coastal area, mostly formed by reclamation from the sea. The rapid economic growth in the last 20 years demands new infrastructure and upgrading of existing facilities. The crowded spaghettilike complex of existing utilities and services underground in the limited road space, and the busy traffic, make such upgrading and construction of new features, by the conventional open-trench method, difficult. The use of tunnelling and pipejacking techniques could however resolve most of the problems associated therewith, such as disturbance to traffic, major diversions of existing utilities, earth moving, and effect of inclement weather. This would also minimise public complaints due to inconvenience and loss of business in the nearby shops as temporary traffic management schemes are only required at the jacking and receiving shaft locations. This paper discusses the various types of tunnelling and pipejacking techniques adopted in Hong Kong for drainage pipeline construction under different site constraints and ground conditions, their performance, the problems encountered and the recommendations made.
NSTL
