A Modular System Method Expands on What is Possible in Tall Building: Ten Degrees Croydon, London
Session: G: Construction Award
President and Founder, Vision Modular Systems, & President and Founder, Tide Construction
MJH Structural Engineers developed a new type of volumetric modular system that can construct modular buildings over 40 stories, showing that what was previously considered aspirational heights of construction for the offsite industry are now possible. 101 George Street is a pair of residential towers 44 and 38 stories high over two levels of basement. Each Tower is broadly square on 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 of the structure is undertaken to minimize the steel tonnage enabling low material costs to be adhered to. The system used is very flexible in terms of layouts and module shapes allowing for excellent design flexibility at the planning stage.
Building the world’s tallest modular building on an extremely constrained, busy site brought challenges. The craneage strategy therefore engineered the tower cranes into and on top of the cores. Structural engineers had to model the differential movement of the concrete cores with the structural steel of the modules, and all challenges were enhanced by a 28-month construction program. The use of the Vision Modular System provided the requirements for structural integrity whilst also meeting the construction program, which would not have been possible with traditional construction or an alternative modular system due to the height of the building.
The system minimizes environmental impact with 80% less construction waste, 50% less CO2, 80% less vehicle movements to site, & 60% less personnel, compounded by shortened construction times. The energy to run Ten Degrees Croydon over the lifetime of the building will be significantly reduced due the efficiencies of the modular technology i.e. thermal properties and air loss. This is estimated to provide a 10 – 20% reduction in OpEx.