Design decisions

摘要

Close coordination between designers, constructors and client has been key to successful implementation of the project, according to lead designer Halcrow Atkins JV. A spokesman for the team says that it co-located its design team with the Costain Laing O'Rourke(CoLOR) JV and LU to aid collaboration, and that use of a detailed 3D BIM model has also ensured cross-disciplinary coordination. Tunnels and Tunnelling speaks with Mike Sleath, tunnelling design team leader for Atkins, to get a better idea of some of the design challenges. "Challenges within the tunnelling design included: Severe constraints on geometry requiring a variety of tunnelling techniques and structural forms; large SCL caverns directly under compensation grouting TAMs; numerous adjacent structures highly sensitive to settlement, including Grade-listed buildings, sewers, the Post Office Tunnel and LU assets including escalator chambers and track; and numerous tunnelled connections to LU tunnels requiring design to minimise impact of the operational station," says Sleath.