Engineers enlarging around smaller pilot tunnel at Westminster on the Jubilee Line Extension, part of London's Tube network.
The most complex and technically demanding new structure on London Underground's Jubilee Line Extension Project, with the deepest tube station in London, was Westminster and its associated rail tunnels constructed close to the Houses of Parliament and adjacent to many important buildings of historical and architectural merit and under one of London's oldest underground railway stations on the District and Circle tube line. A variety of civil engineering techniques such as tunnelling, piling, diaphragm walling and top-down construction were used to construct the station escalator hall and foundations to a prestigious new parliamentary building. Buildings surrounding the work-site, together with the District and Circle Line station passing diagonally through it, severely restricted construction access and working space. Major challenges to the construction team included movement control of adjacent structures such as one of the world's most famous clocks, Big Ben and a major trunk sewer. It was also vital, whilst rebuilding the existing station, to maintain an uninterrupted flow of passengers and trains through the station. The Jubilee Line covers ( miles) and serves 27 stations between Stanmore and Stratford. The equivalent statistic for the new extended section is 16km (10 miles) of which km ( miles) is in tunnel and km ( miles) on the surface. Work started on the £ billion project to extend the Jubilee line in December 1993. The extension runs from Green Park to Stratford and was opened in three phases during 1999.
Size: 3314px × 3313px
Location: London, UK.
Photo credit: © qaphotos.com / Alamy / Afripics
License: Licensed
Model Released: No
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