Engineering Aspirational to Achievable Heights: Ten Degrees Croydon, London
Session: Track D, Session 2: Structural Engineering Award: Part 1
Managing Director, MJH Structural Engineers
Director, Barrett Mahony Consulting Engineers UK
Ten Degrees Croydon is a pair of residential towers set over two levels of basement. The towers were constructed from 1,526 modules manufactured off-site before being delivered and installed around two concrete cores. A new type of volumetric modular system was developed to construct modular buildings that rise above 40 stories, proving that previously “aspirational” heights of construction for the off-site industry are now possible.
Each tower is broadly square in plan, with 20 modules per floor arranged around a central concrete core in Tower A, and 18 modules per floor arranged around a central concrete core in Tower B. With concrete floors and an integrated steel support system within the modules, the completed building is indistinguishable both internally and externally from a traditional building. The structure of the building is located at the corners of the module walls, where intense engineering is undertaken to minimize the steel tonnage and enable low material costs.
Many of the fabrication and manufacturing techniques used were created, extended, and refined during the project. Additionally, the modular components were placed on the building in just 35 weeks, three weeks ahead of schedule. The new connection details introduced here increased speed and accuracy significantly, resulting in up to 70 modules placed per week at a comfortable pace. The duration of placing was ultimately limited only by the speed of manufacturing. The use of volumetric modular construction contributed greatly to improving the sustainability of the construction process. Modular construction facilitated the production of early-stage material lists, which allowed very detailed ordering and cutting lists to be prepared, cutting construction waste by 80 percent.