Built on a complex urban site bordered by three railway lines, the Putney Plaza development required extensive Network Rail and Transport for London (TfL) liaison in connection with the demolition of the existing buildings, temporary works and crane designs as well as the new buildings. The four new residential towers share a common basement, and public landscaped plaza, and have step-backs to create sky gardens.
We were appointed at Stage 3 to complete the design, which originally used traditional in-situ concrete frames as the structural solution. To reduce the slab thicknesses, we proposed using post-tensioned slabs instead, which also required less reinforcement, fixing and crane hook-time.
Additionally, pre-cast columns and walls were adopted, which again reduced hook-time, enabling a shorter construction programme. This also meant finishing costs were reduced, as the off-form concrete finish of the pre-cast walls was of sufficient quality to avoid the need for further finishes.
We ensured that communication with Network Rail and TfL commenced at an early stage in the project and updated our client regularly on the status of discussions. This ensured key project outputs were achieved within the agreed timescales.