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  Design and Construction of Pipe Jacking by Micro TBM for Combined Cycle Gas

  This paper presents the planning, design and construction of 3.2m diameter cooling water pipe by pipe jacking method in Hong Kong, which includes one curved line section of 380m length. The pipe alignment and method of construction was selected considering the need to mitigate the impacts on existing utilities and on existing cooling water pipes, and to eliminate the need for Emergency Vehicular Access and utility diversions along existing roads. There deep shafts with maximum depth about 34m are constructed for Tunnel Boring Machine (TBM) launching and receiving. The cooling water pipe between shafts is at a considerable depth due to thick reclaimed rock fill on site. The system uses a small diameter TBM and jacking station to install prefabricated cooling water pipes under the ground from a jacking shaft towards a receiving shaft. The shafts are equipped with entrance or exit rings and seals, to ensure the effectiveness of the TBM face pressure and prevent groundwater inflows through the shaft wall opening. Those openings are designed to be formed in a way that ensures stability and groundwater tightness with ground treatment by jet grouting. A comprehensive monitoring scheme is implemented on site to check the performance of pipe jacking works.

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