Client: 49 – 51 Conduit Street, London
Located in one of London’s most prestigious areas, this 6 storey retail and commercial development have replaced two former commercial buildings with one large re-development. The new building comprises of a basement, ground floor and first-floor retail space, five floors of offices with an overall area of 3,900 sqm and a rooftop plant deck.
A steel frame was chosen as the best option for this development due to site constraints, maximising the number of floors and the efficient erection time.
All floors within the building have been erected using slim 450 mm deep Westock cellular beams. The beams span a long grid arrangement of up to 10 m, allowing the number of internal columns to be reduced to one. Additionally, the passage of the services through the Westok beams has reduced the floor depth and allowed the structure to have the optimum number of floors.
One of the biggest constraints BHC Ltd. had to overcome was the lack of space on site. The road along two elevations and existing properties on the two other sides left no space for materials to be stored. All deliveries were made on a Just-in-Time basis, the steel sections were lifted straight off the delivery vehicle and erected almost immediately.
Due to the small scale of this London site, BHC Ltd. erected the steelwork in phases. The first phase included erecting the structure from the basement to the third floor, using the vacant part of the site for temporary steel laydown. Once the first half of the structure was completed – including the metal decking and concrete topping – BHC Ltd. was unable to erect the other half of the structure while using the completed frame for steel laydown.
A slim construction approach was incorporated in the design of the development perimeter columns. These are twin RHS sections connected by CHS bracing, designed to be as slim as possible to fit the architectural vision and maximum floor space. The columns resemble trusses and were delivered to site in three storey lengths, fully assembled with their connecting bracing.