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Working details

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Murray Grove housing Cartwright Pickard

The five-storey housing comprises storey-height prefabricated 'modules'.They are assembled on site and bolted together to form a rigid assembly.

A staircase at one end ofthe block leads to 1.5m wide access decks at upper floor levels.They are formed ofa series ofprecast concrete units,a material chosen to give one-hour fire protection.

The deck floors fall to drainage channels;the coffered soffits are fitted with a central light fitting.

The precast concrete deck units are 3.2m long,matching the module width.At internal corners they are fitted with cast-in 120 x 80mm RHS pockets which rest on 150 x 90mm shelf angles bolted to the modules.At external corners they are supported by a row ofeight steel columns running along the front facade and rising to the fourth- floor deck.The steel structure support was fire-engineered to ensure an acceptable resistance to fire without the need for intumescent paint.

The eight columns were erected in storey-height sections connected at floor levels over 60mm diameter spigots.A 15mm fin plate welded to each column slots in between the welded endplates ofa180 x 75mm parallel flange channel ( PFC )which is cast to the outer edge ofeach deck unit.The columns are braced with 14mm diameter stainlesssteel cables to prevent progressive collapse.Bracing is secured to the columns at the spigot by stainless-steel turnbuckles fixed to circular bosses.Balusters are bolted to the top flanges ofthe PFC s.

The windows and spandrel panels to the modules were installed in the factory.The walls are clad with a rainscreen system ofstack-bonded terracotta tiles,fixed on site to a factory-installed sub-frame.

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