TBMs exit tunnels as roadheader, cross passage excavation continues
Posted: 20 Jul 2021
After completing tunnelling works in May, our four tunnel boring machines (TBMs) are being retrieved from underground.
TBMs Meg, Alice, Millie and Joan are being carefully dismantled – including dissecting their 7.2 metre-wide cutterheads into smaller pieces (above) – before being transported back through the tunnels. The machines will be returned to the supplier and reassessed for potential reuse.
Digging continues on the project as roadheader machines excavate the tunnels next to the platforms at Town Hall Station.
Works are also continuing on the 26 cross passages between the tunnels, which allow people and equipment to move between the tunnels in an emergency.