Skanska Costain Strabag JV crews have now shifted focus to installing the tunnel base and fitting out the route with 34 cross passages and surface headhouses that house ventilation and emergency systems.<\/p>\n
| Northolt Tunnel Facts<\/th>\n<\/tr>\n | |
|---|---|
| Detail<\/th>\n | Figures<\/th>\n<\/tr>\n |
| Total tunnel length<\/td>\n | 8.4 miles<\/td>\n<\/tr>\n |
| Number of TBMs used<\/td>\n | 4<\/td>\n<\/tr>\n |
| Clay excavated<\/td>\n | 4.16m tonnes<\/td>\n<\/tr>\n |
| Concrete rings installed<\/td>\n | 14,300<\/td>\n<\/tr>\n |
| TBM diameter (Anne)<\/td>\n | 9.11m<\/td>\n<\/tr>\n |
| Deepest point<\/td>\n | 35m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n TBM Anne was named after educational reformer Lady Anne Byron following a public vote in Ealing, where she founded one of England\u2019s first co-operative schools.<\/p>\n Richard Adam, managing director at SCS JV, said: \u201cAs we move forward, work continues at pace on the cross passages, tunnel fitout and surface structures and we are preparing to launch our final two TBMs to Euston early next year.\u201d<\/p>\n Northolt is one of five deep twin-bore tunnels on the 140-mile route and the second longest behind the Chiltern Tunnel, which is 10 miles long.<\/p>\n |