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Traditional construction would commence with excavation down to the lowest basement level and work up on a level by level basis to ground floor and then to the superstructure.
Topdown construction typically gains significant time over the traditional building sequence by minimising the below ground construction works prior to commencing the superstructure. The remainder of the basement levels are then constructed in parallel with the superstructure construction in a top-down sequence.
Topdown works typically consist of access through a completed ground floor for excavation and construction of the basement floor levels working in sequence down to the lowest basement slab level.
Paddington Crossrail Enabling Works
Paddington, London
Construction of RC box structure to be used to service driving of the new Crossrail tunnel.
