Work Item Summary
- Project Phase
- Phase 1
- Region
- Brent and Ealing, London
- Worksite Name
- Mandeville Road
- Contractor
- SCS JV
- Type of works
- Borehole works, Tunnelling
- Estimated Start Date
- 26/09/2022
- Estimated End Date
- 30/12/2024
What we are doing
Tunnelling update
The Northolt Tunnel West route broadly follows the London Underground Central Line and the Chiltern Mainline. So far, our tunnel boring machines (TBMs) have built just over eight miles of tunnel since their launch in September 2022. The first of our TBMs will be leaving the Mandeville Road vent shaft towards the end of July. The second TBM has just passed under Mandeville Road and will stop for around two weeks within our vent shaft site for routine maintenance.
Monitoring taking place during tunnelling
We have installed specialist equipment in several locations along the tunnelling route to monitor ground movement before, during and after construction. The surveying team will be at various locations in Northolt to take regular readings from this equipment. You may see members of the team assembling a tripod to mount monitoring equipment in order to take readings. This activity will be quiet, for a short duration and will not affect access to footpaths and driveways.
We are also monitoring the footbridge linking Carr Road and Belvue Road. We are expecting minimal ground movement from our tunnelling, but it may be necessary to temporarily close the footbridge for safety reasons, until the TBM has passed this location. If this becomes necessary, we will put up notices on barriers. We will cordon off both ends of the bridge and a clearly signed diversion route will be in place. We apologise in advance for any inconvenience this may cause.
Download information relating to these works
Find out more about
If you have a question about HS2 or our works, please contact our HS2 Helpdesk team on 08081 434 434 or email [email protected]