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19 Industrial NSC July/Aug 16 Clear open spans of up to 36m are vital for the manufacturing process chosen for their stiffness and ability to carry heavy loadings, the inner part of the twin columns, where necessary, supports the high-level crane rails, while an outer part extends up to the roof, connecting with the roof trusses. Because of the need to incorporate cranes, the northern or manufacturing part of the facility has a height to eaves of 15m. The southern part of building, or finishing zone, has no overhead cranes and consequently the roof level for this zone drops down to 10m. This part of the building has the same width as the northern zone but is formed with just three spans, two at 47m and a third measuring 22m wide. As this area does not have to support any cranes, the truss supporting columns are not twin lattice sections but 610 UBs. “The longest trusses were brought to site in three sections, while the 22m-long trusses were fabricated in two pieces,” explains Caunton Engineering Contract Manager Michael Firth. “Once on site they were bolted and assembled into complete trusses and then lifted into place by a single mobile crane.” 20 Alexandra Dock – the whole story Associated British Ports, which owns the site, has appointed Graham Lagan Construction Group JV to develop the overall Alexandra Dock for the Siemens facilities. The blade manufacturing facility ➊ is being built under a separate contract and so all around this site other important works are on going. The JV is responsible for the partial reclamation and infill of the existing dock, the construction of three new berths and a roll-on roll-off ramp. On the opposite side of the dock to the blade facility, a separate steel-framed structure for the servicing and refurbishment of blades is being erected ➋. Crane beams are supported on twin lattice columns A lattice column being fabricated at Caunton’s facility ➊ ➋


NSCJuly2016digi
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