DJ MacCormick Contractors has completed the twin crossings of Humes 1000 mm reinforced concrete jacking pipe in Port Hedland, Western Australia.
To complete the project, DJ MacCormick Contractors utilised the Iseki closed face slurry shield microtunnelling system. Ground conditions on site were in wet clay and at depths that ranged from 4 m to 6 m cover.
Of the six 1000 mm drives completed, two drives of 46 m were completed under Utah Road with an additional two drives of 152 m under the BHP Rail also being completed. A further two drives of 80 m under the FMG Rail line were also undertaken. A seventh drive of 1800 mm was also completed 112.5 m under the BHP Rail, located nearby the Iron Bridge mine site.
The total distance tunnelled for the project was approximately 668.5 metres.