The scheme had a tight programme because HSBC had a fixed date to move into the building. However, the unexpected discovery of several bell pits underground made an already tight program even tighter. In response, we chose to modularise the key building
services components and precast the three structural cores. This enabled us to save time on the installation and ensure we met the deadline.
We devised the modularised solutions with Leonard Design Architects plus key suppliers including M&E specialist NG Bailey and Creagh Concrete. The decision to use precast cores was made 16 weeks before the units needed to be delivered but Creagh met
the challenge. They also digitally modelled the precast units including the cast in plates for the steelwork connections, working in partnership with our steel fabricator Severfield to ensure the connections would fit. The 34.5m-tall cores each comprise
17 precast sections, the largest was 8m by 4.6m across and 2m high and weighed up to 26 tonnes. The first was installed in just eight days.
We also decided to get as many of the service runs and the plant rooms, manufactured offsite as possible including floor plate modules, service risers, riser caps and plant rooms. The largest plant room measured 7.6m by 5.8m by 3.7m. Weighing 21 tonnes,
it had to be split into two units for transport.
