sections , consisting of three beams and one node and bolting these to the partly installed skylight . A series of shoring towers were erected at specific locations to provide temporary support while the structure was being installed . Once a full arch section had been installed and fully torqued , the shoring towers were removed .
ETFE The cladding consists of a series of ethylene tetra-flouro-ethylene ( ETFE ) air-filled pillows . Each pillow is supported by aluminium extrusions and the system is inflated by three air machines
mounted on the roof . Each air machine is equipped with two blowers a dehumidifier and a series of sensors which continually monitor the overall pressure in the pillows and adjust this pressure as required . Based on glare and shading studies , the pillows were made of a combination of either two partly opaque ETFE layers or one clear printed ETFE upper layer and a fully clear lower layer .
The extrusions and ETFE cladding were installed using nets which were tied to the steel structure and removed once a portion was fully installed and water-tested .
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