CampbellReith carried out the civil and structural design work on the recently completed Leman Locke, located near Aldgate East. The new tower development provides 168 serviced apartments over 23 storeys, with a restaurant and café bar at ground floor level. The development falls within the Aldgate Masterplan area and City Fringe regeneration zone and forms part of the wider regeneration of this area of London which is undergoing large-scale changes.
CampbellReith was responsible for the design of the superstructure and foundations as well as the below ground drainage and external hardstandings.
The ground and first floor of the building are occupied by a restaurant and café bar which opens out onto a street level terrace at ground floor. The ground floor also accommodates the reception area for the upper level apartments and an undercroft service yard area and substation.
The superstructure takes the form of an insitu reinforced concrete frame with 225mm thick typical upper floor slabs supported on ‘blade’ columns located within the party walls between apartments. These columns are supported in turn on a 1.0m thick transition slab at second floor level, which transfers the apartment columns to a larger grid of expressed circular columns within the lower level restaurant and bar area. A piled raft foundation located below the basement worked in combination with a secant piled perimeter wall to support the superstructure loads.
The building is located on a small 30m x 15m plot and as a result is very slender about its north-south axis, with an aspect ratio of height to width of over 6. This made stability and sway a key aspect of the design that required careful consideration. The design and location of the stair and lift cores required detailed coordination with the architect to ensure they provided the required lateral stability to resist wind loads yet minimise the impact on the apartment layout.
To assist this exercise specialist wind modelling analysis was carried out to determine loadings and deflections to the frame and also check that horizontal accelerations due to high wind loads would not cause discomfort to the occupants of the upper storey apartments.