Abstract:
1 Triton Square was originally a six-storey building with a one-level basement located within a commercial
development near Euston, London. It was designed and constructed in the late 1990s and the foundation
scheme comprised straight shafted London Clay piles arranged singly beneath columns. The scheme added
three storeys to the structure and a five-storey infill in the central atrium area. The refurbishment increased
the building floor by 70% to 32,100 m2
(47,200 m2
gross) and maintained the usability of the basement
space. As the loads to support the additional floor area were greater than the capacity of the existing
foundations, an optimised strengthening scheme of small diameter piles installed within the existing
basement and a retro-fitted raft was installed. The re-use and strengthening of the existing foundations
enabled re-use of key elements of the superstructure which in turn resulted in approximately 35,000 tonnes
of concrete and 1,900 tonnes of reinforcement and structural steelwork being re-used. The structural
embodied carbon for the refurbished building scheme averaged as 136 kgCO2e/m2, achieving a Structural
Carbon Rating Scheme (SCORS) “A†rating.