Service Performed Detailed temporary and permanent lining design, settlement assessment and construction supervision.
Technical data
Temporary shotcrete lining design of running tunnels, step plate junction, temporary works access tunnels, shafts, platform and concourse tunnels and ventilation tunnels. Permanent lining design, reinforced concrete and steel fibre reinforced shotcrete.
Geology description
Made ground, alluvium / terrace gravels, London Clay, Woolwich & Reading Beds.
Description
London Bridge is a major new station on the 16km long Jubilee extension of London Underground. The vicinity of construction is considered highly sensitive due to old existing tunnels and surface structures. The original design called for hand mining, shield machines for excavation and a segmental cast iron lining for tunnel support. NATM handled the geometrically complicated tunnel alignments and shapes with significantly lower effort. It minimised settlements, which reduced the amount of compensation grouting estimated.
