The Coal Drops consist of two long brick and cast iron Victorian buildings, once used to carry four high-level railway tracks from which wagons dropped coal into storage hoppers below.
The buildings, known as East Coal Drops and West Coal Drops, are approximately 150m and 120m-long respectively, and sit side-by-side while splaying outwards in a southerly direction.
As part of the programme to convert these buildings into a world-class retail destination, a steel-framed roof structure has been erected between the two buildings at the northern end where the gap between the structures narrows to about 30m-wide.
The roof structure is approximately 75m-long on one side and 65m-long on the other. It curves inwards, from the south and north ends, and then rises up in the middle to a maximum height of 25m.
Two ‘ribbon’ trusses, sat atop of each building, help form the undulating shape of the roof structure.
The trusses were fabricated from 610mm CHS members with 508mm CHS verticals and bracings made from 219mm CHS sections.
Tubular sections were used as the geometry of the trusses is so complex no other steelwork sections would have worked without a considerable amount of extra fabrication.
The Coal Drops Yard is scheduled to open towards the end of 2018.