30 PROJECT REPORT: MODERN METHODS OF CONSTRUCTION
NARROW BROWNFIELD The designers’ response to the site – a narrow piece of brownfi eld land accessible by a ramp being used as a car park below the surrounding street level was to reduce the footprint to a minimum, creating two slender towers with a double- height colonnade wrapped around the base on the three public faces. A new public realm and pedestrian route was created by cutting back the lower three oors of a typical oor plate, adding space for street greenery and encouraging access to ground level community spaces and a cafe. The thin, tapering plot was a tricky proposition when developing the scheme’s massing, TA chose to position the main frontage towards the railway and the narrowest elevation towards busy eorge Street to limit its visibility. The extensive north-facing aspect limited scope for direct sunlight, so exaggerated folds were introduced in the facade to create triangulated oriel windows which introduce east and west sunlight into apartments. Structurally, ollege oad is a hybrid, the basement, two circulation cores and the fi rst four levels housing key communal and amenity spaces, are built traditionally, in reinforced concrete. The top of the fourth oor acts as a transfer slab to support stacks of volumetric modules of different sizes and shapes above.
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The volumetric design varies from
oor to oor to ensure the most effi cient use of steel as the load changes across the building’s height. Each module was delivered to site fully fi tted-out and furnished.
There are a variety of module types from one side of the building to the other, says ergin, Most modules are different in plan, but because they stack vertically each module type is repeated across all oors. According to Tide’s Farrell, the structural system is very similar to that used on Ten Degrees, but there were certain refi nements to improve effi ciencies. The sheer height of the building had implications for the alignment of the structure. Differential settlement can be an issue in taller buildings because concrete, in particular the cores, shrink at a greater rate than the steel structure.
A predetermined erection sequence was designed, based on detailed calculations carried out by Tide and the structural engineers, to ensure proper alignment during settlement. Furthermore, custom connectors were developed for the modules to slot into steel connection points cast into the concrete to allow vertical exibility between the modules and the core.
TANDEM LIFTS
The construction sequence saw modules manufactured in Tide’s factory in
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