Leading Tunnelling Contractor D.J & M.B Mac Cormick has completed the states longest microtunnelling drive under the Mitchell Freeway and Northern Transit Railway Lines as part of the Yarragadee Groundwater Project.

The 180 metre drive for a 1 metre diameter steel jacking pipe took 9 days to complete located near Bryan Place, Stirling.  It was undertaken without any disruption to Freeway traffic or trains using the northern suburbs railway line, which runs down the middle of the freeway.

Microtunneller in pit

Ariel view of the Mitchell Freeway and Northern Transit Railway Lines

Water Corporation Perth Region Business Manager John Longley praised the Contractor for their excellent job, which was subject to stringent working conditions.

The railway line was the most critical factor to consider as anything more than the slightest ground movement could have disrupted train services” Mr Longley said.

“As part of the Contractors quality control plan monitoring equipment was installed to check for any ground movement on the freeway and the railway reserve.  The contractor was working to tolerances of only 5 millimetres which is very exacting considering the scope of the work and the size of the tunnelling equipment used”

The line and level of the microtunnel was completed within 10 millimetres of design and was a significant component of a 17km pipeline being constructed to connect the lines to the existing Mt Yokine Reservoir.

The company also has a 1.8 metre diameter tunnelling machine which is undertaking works on their Bulimba Creek Trunk Sewer Project in Brisbane.  Drive lengths on this project range up to 230 metres.

For further information regarding the company’s capabilities visit their website at

 Article supplied by DJ & MB MacCormick.

Last Updated on 29 December 2002