Microtunnelling completed ahead of schedule

Works for the new Mount Eden tunnels are on track, with microtunnelling completed twice as quickly as planned.

Auckland’s City Rail Link (CRL) has reached its next stage after a stormwater main was removed.

The removal and relocation of the obstacle allows for the construction of the new tunnels in Mount Eden to begin.

A microtunnel boring machine (MTBM), dubbed Jeffie, excavated more than 2,000 m3 of soil and installed 208 segments of new concrete pipe; each segment of pipe was 2 m long and 2 m wide, weighing 7 t.

The excavation was planned to take 15 weeks to complete, however the MTBM completed it in only 7 weeks.

The excavation of the stormwater main itself was finalised in March, although more contract work remained, including installing a new 423 m stormwater main 17 m below ground.

The project is a $4.4 billion, 3.5 km long rail tunnel that will connect Britomart Transport Centre in downtown Auckland to Mount Eden train station and is due to open in 2024.

For more information visit the CRL website.

If you have a project you would like featured in Trenchless International contact Managing Editor Chloe Jenkins at cjenkins@gs-press.com.au

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