Six Pancras Square
Intended as the new London headquarters of global banking group BNP Paribas, the thirteen-storey building is designed by French architect Wilmotte & Associés. Clad in terracotta, the landmark building features a full-height central atrium, roof gardens and two basement levels.
The new building is part of the prestigious Pancras Square development in King’s Cross, located on the site of former gasworks, posing significant ground engineering problems for us to solve.
Remediation works included removal of a former gas holder, while ensuring that the piled perimeter wall along Pancras Road was completely watertight to prevent any risk of contamination. This wall was constructed from secant piles, sized to limit deflections during an unusually long ‘temporary’ state. Where the wall slices through the gas holder, piles were further waterproofed using injection grouting, with a cavity in front to capture any seepage.
Under one corner of the site runs the high pressure Thames Water Ring Main. We carried out a detailed geotechnical analysis, modelling the effects of site clearance, piling work and construction. This demonstrated to Thames Water that the impact of the works was within acceptable limits.
The building itself features a reinforced concrete frame to upper ground floor level, the remainder constructed from steel and designed as column-free, delivering efficient and flexible workspaces of spans in excess of 13 m.
The structural grid features spans of up to 13.5 m, constructed with 130 mm concrete floor slabs poured onto profiled metal deck, working compositely with 630 mm deep cellular steel beams, specified to keep the structure as lightweight as possible.
We modelled the structure to ensure vibrations were within acceptable limits. The structure has also been engineered to be as flexible as possible, with ‘soft spots’ that can be opened up to insert new staircases, while the atrium can be partly infilled to provide additional floor-space without the requirement of strengthening works.
Commercial office building as part of the huge masterplan for Pancras Square in North London
BNP Paribas Real Estate UK
Wilmotte & Associés, Adamson Associates
£ 78 million