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Internal lining to stations, Heathrow Express

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The new high-speed train link from Paddington to Heathrow runs through a tunnel at the airport which serves its four terminal stations.The steel-lined support structure of the tunnel had to be clad at stations and in public areas.It is lined with 14,000 m 2 of coffered GRC panels,produced by Techrete.

GRC was chosen for its durability and appearance and because,being light in weight,it is relatively fast and easy to install.

The panels,900mm x 1.8m long,were made with a Ballybrew granite mica/glassreinforced mix sprayed into glass-fibre moulds and given an acid-etched and slightly sandblasted surface.They were secret-fixed with stainless steel fixings and faceted around the curve of the tunnel.The joints were firestopped and lined with purposemade gaskets.

At platform and public areas the lower three panels are infilled with toughened glass panels to give extra protection.A row of glass-filled panels at higher level is used for back-up signage.Special curved panels were made by Techrete to accommodate the complex armature of the structure around escalators and curved walls.

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