The Leadenhall Building, nicknamed the ‘cheese-grater’, is a 50 storey steel structure founded on a four storey piled basement structure. Faced with a deep basement in a very confined site Byrne Bros., in conjunction with McGee (demolition and temporary works) and Cementation Piling, developed a robust logistics strategy and highly coordinated basement construction sequence.
To minimize the programme and avoid costly top-down construction techniques, Byrne Bros. developed a strategy of pre-assembling reinforcement cages offsite, reducing site fixing to a minimum.
Concrete mixes were carefully blended to control curing temperatures on raft pours in excess of 1000m3, but still produce a fine finish on the retaining walls. This overall approach ultimately led to an economical basement construction solution.