Search Results: 'Halcrow'

Box jacking under the M1
01 September, 2003
Jacked box tunnelling was used for the first time under a live motorway in the UK at Junction 15A on the M1 Motorway, when a vehicular underbridge, 14m wide, 8.5m high by 45m long was installed with 1.6m of cover to the motorway. On the 19 June British Tunnelling Society members were privy to a detailed explanation of the project

Making difficult decisions
01 July, 2003

Managing tunnel sustainability
01 May, 2003
According to N G Swannell, associate director for Halcrow Group Ltd, the key to effective tunnel management is through proper planning and detailed risk assessment. In this article, Swannell sets out a general framework, drawn from international asset management practice, that can be applied to tunnel structures

North Downs Tunnel technical overview
01 March, 2003
Value engineering on the North Downs Tunnel, a 3.2km long high-speed rail tunnel on Section 1 of the UK's Channel Tunnel Rail Link, allowed estimated savings of US$14M and contributed towards completion five months ahead of schedule. Here, Colin Warren (Halcrow), lead engineering geologist for Rail Link Engineering, describes the technical innovation, value engineering and integrated observational approach adopted throughout construction