This project entailed the construction of the expansion of the Northern Line with approx. 3 km of planned bored tunnels (5.2m internal diameter), along with the construction of two new London Underground stations – Nine Elms and Battersea. A Step Plate Junction was constructed using SGI / Timber Heading in order to connect to the Northern Line’s existing loop tunnel at Kennington Station to the new extension. Further the existing Kennington Station was enlarged by 4 additional Cross-Passages with SGI lining and hand mining.
TBM Tunneling Expertise Consulting Services:
Gall Zeidler Consultants provided pre-tender design services to a contractor JV and subsequently independent Category III check design services for all SCL structures, the Step Plate Junction and new Kennington Station cross passages.