An existing basement car park structure was to be retained and re-used as part of the proposed development. However, site investigations revealed rock at a shallow depth, highlighting a ‘very weak layer’ of material below. Borehole information was limited as it was outside the proposed footprint of the building and it wasn’t possible to fit a borehole rig into the basement car park.
The challenge was to construct a tall, heavy concrete building using a shallow foundation solution.
Extensive temporary works were carried out during the build, including those required to prop the existing highway retaining walls prior to removal of the ground floor slab acting as a prop.