Major progress made on HS2’s Copthall Green Tunnel

The 880m long Copthall Green Tunnel is located within the London Borough of Hillingdon, between Harvil Road in the west and Breakspear Road South in the east, and sits between the twin bored Northolt Tunnel and the Colne Valley Viaduct.

The Copthall Tunnel is one of five green tunnels on the HS2 route, which are shallower tunnels which will be finished with trees, plants and shrubs on top – helping them blend into the natural landscape. Materials from the excavation are kept on site and then reused on the tunnel surroundings, reducing movement of spoil.

In this latest update, we focus on the progress made on the tunnel such as the completion of the cut, the reopening of the new realigned Harvil Road, the works made on the central section, including the construction of the first vent stack and the work on the soil placement areas (SPAs).

In the Northern SPA, the planting of the first 1,300 plants has began. This is part of 70,000 individual trees, shrubs and bushes that will transform the area into a haven of biodiversity once the landscaping is complete.

The tunnelling team have excavated approximately 500,000m3 of TBM material which is being used to form three mounds within the Southern SPA, keeping the material within site boundaries at Copthall.

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0:00 Introduction
0:06 Latest works on the tunnel
0:43 What is the Copthall Tunnel?
0:59 The first vent stack
1:23 Rebar facility update
1:39 No lost time incidents
2:01 Backfilling over the tunnel
2:37 Latest environmental works
2:43 What is the NSPA?
3:10 What is the SSPA?
4:01 Update on the SSPA
4:23 Planting the first trees at the NSPA
5:10 Upcoming works on the tunnel
5:44 Outro

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If you have a question about HS2 or our works, please contact our HS2 Helpdesk team on 08081 434 434 or email [email protected].