Tunnel & Underground

Our tunnelling capability is unrivalled. With more than 30 years experience, we have delivered over 140 km of safe, smart, efficient tunnels and underground spaces while minimising community and environment impact.

Capability TU

McConnell Dowell tunnels have provided the means to alleviate traffic congestion, extend rail networks, generate sustainable hydropower, unlock precious resources and sustain communities through new clean water supplies.

We have delivered over 140 km of safe, smart, efficient tunnels and underground spaces while minimising community and environment impact.

Our skill is in selecting the right technology and approach to suit each project’s unique requirements.

We have engineered solutions using tunnel boring machines (TBM), road headers, drill and blast, pipe-jacking, micro-tunnelling and horizontal directional drilling (HDD).

Our strong relationships with key equipment suppliers mean we mobilise quickly and begin construction on time. Our standard practice is to coordinate underground and above-ground activities to minimise any inconvenience to businesses, residents and traffic.

We broke TBM tunnelling world records during the Blue Mountains Sewerage Scheme, completed the longest pipejack in the Southern Hemisphere on the Pringle Hill NNA Pipeline, and are the only contractor in the Southern Hemisphere to have performed three successful TBM marine recoveries.

Looking to the future, we are driving progress in the resources sector through the safe, compliant and efficient delivery of mine access drives using rapid advance, full-face tunnelling technology.

 

Key Tunnel and Underground Projects

  • Project Milestone - Singapore Metro Tunnelling Completed at Beauty World
  • Singapore Metro Tunnelling Completed at Beauty World
  • Bogong Hydro Scheme, design and construction of 6 km of 5 m diameter headrace tunnel, two vertical shafts, a 1 km steel-lined high pressure tunnel, a power station to house twin 70 MW generators, and a tailrace outfall into Lake Guy, Kiewa Valley, Victoria, Australia.
  • Construction of 1,200 m long conveyor decline at Mandalong, NSW, Australia.
  • Blue Mountains Sewer Tunnel, NSW - excavation of approximately 18 km of gravity tunnels completed 18 months ahead of schedule and achieving several world records for tunnelling. This tunnel (supported by rock bolts and shotcrete) had a 13 km continually advancing conveyor system to remove spoil as well as 12 No. ventilation shafts.
  • Senoko to Gambas Cable Tunnel, Singapore - Design and construct twin cable tunnels, 3.7 metre diameter, total length 3.4km together with 3 main access shafts and ME&I fit-out.
  • Eastern Distributor Project - southern tunnels section - excavation of double-decker road tunnels by heading and benching methods with roadheaders with hydraulic breakers in Sydney sandstone.