Olivers Yard

The main design issue with this project were, that no load could be transferred to the top of the revolving door drums whilst also accommodating the differential movement of the first floor slab above.

In order to over come these design issues the glazed screen was design on the basis of the glass panels being restrained by channels top and bottom, with the outer leaf of the double glazed panel being fixed into a deep glazing pocket at head level with 2 x 2mm of slipstrip which is a low friction bearing strip placed between the face of the glass and the structural steelwork to form a thin sliding joint either side to accommodate the differential movement produced by the first floor slab when fully loaded.

This glazing pocket was formed from nested mild steel angles in order to give a min 80mm glass cover, the angles were hung from a unistrut support frame bolted to the underside of the first floor slab. At ground level the double glazed units sat in a 50 x 50 x 3mm stainless steel channel section that was cast into the ground floor screed with a 6mm low modulus silicone weather seal either side of the double glazed unit.

The glass over panels above the two revolving door drums had to be restrained in a similar way so that no load was transferred to the top of the revolving door drum. Due to the fact that the over panels could not be based supported the over panel was hung from the top glazing pocket, via 4No M10 bolts fixed through the vertical legs of the nested angles,w ith 4mm of neoprene between the angles and the face of the glass on either side to prevent the glass to metal contact. Increasing the size low modulus silicone between the top of the door drum and the bottom of the over panel accommodated for any differential movement of the first floor slab.