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A canopy/shutter door to a steel-framed pod - working details

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MPV nightclub, Leeds Union North

The bar/venue is housed in four linked steel-framed pods set under the brick arches of a functioning 19th-century railway bridge.Each is shaped like an inverted boat hull; size and shape were limited by clearance requirements to maintain the arches. The structure, a series of curved 152 x 89mm UBs and 150 x 75mm PFCs (parallel flange channels), covered with a continuously welded 3mm mild steel skin, was prefabricated by Merseyside Ship Repairers.

The front of each pod is a steel frame, covered with GRP to accommodate the curved jambs to the upper window and glazed facade.

A pivoting projecting canopy runs above each facade. It has a steel frame of 160 x 160mm and 120 x 80mm members clad with GRP. When the bar/venue is closed, it pivots to act as a shutter door, enclosing the facade and protecting the interior.

The shutter door pivots on a mechanism formed by a 250 x 250mm SHS pivot beam which runs at the head of each canopy, with phosphor bronze pivots at its ends which fit into split brass bearings.A pair of 203 x 102mm UB arms are welded to the pivot beam. The lower ends are bolted to the canopy/door frame; the upper ends are bolted with a phosphor bronze pivot to a huge counterweight beam - a 254 x 254mm UC weighted with solid 10mm bars.The counterweight assists the opening mechanism which is a motorised winch, winding a cable fixed to the pivot arm.

The upper parts of the UB arms are neatly enclosed in the narrow jambs on each side of the upper window.

The soffit of the canopy is fitted with lighting to illuminate the pods at night.

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