Blossom Street

London
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Story

Set within the Elder Street Conservation Area and a designated Scheduled Ancient Monument, this 350,000 sq ft mixed use regeneration scheme has been sensitively designed to preserve the character of the existing buildings, many of which will be restored, refurbished and remodelled. The scheme will provide a range of commercial space for businesses of all sizes, as well as new retail premises in keeping with the Spitalfields character, and new residential apartments.

Cantillon was initially appointed by British Land to undertake a strategic review of the overall demolition and construction strategy. This identified the potential benefits to the programme by combining the demolition, basement and structures packages as well as the potential to de-risk the scheme for British Land, and to provide greater assurance through a single point of responsibility.

Our scope comprises a single storey basement and primary structures varying in height between 10 and 14 floors.

22,000m3 bulk excavation
Single storey basement
5 exposed cores
2 RC frames
3 PT frames
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highlights

Enabling and substructure works

Cantillon undertook the main demolition, strengthening, façade retention, piling and bulk excavations. We are delivering a very complex set of substructure works which are further complicated by the existence of retained structures and facades which are to be incorporated into the fabric of the new buildings. An exceptional level of skill and finesse is therefore required during the substructure works which involve the construction of a single storey piled basement for five separate structures, secant piled retaining walls, traditional and piled foundations, and raft structures, drainage, waterproofing and gas membranes.

The site interfaces with Network Rail’s main line in and out of Liverpool Street as well as two London underground lines running beneath the site. We are constructing a substantial concrete transfer structure to isolate the adjacent LUL asset.

Access and Logistics

Our vehicular ‘top down’ gantry solution, utilising and enhancing the permanent works in the temporary condition reduced the potential environmental impacts on the City and the local community by avoiding congestion to Shoreditch Street and allowing all site deliveries to be contained within the site boundary.

Complex Temporary works

Our temporary works propping solution for the existing and new boundary walls was co-ordinated with both the existing structures supports and the build sequence for the new basement structure.

Core Construction

The scheme has been designed as five separate structures by four separate Architects each with their own requirements for the exposed concrete areas. To achieve the required detail and finish to the core we worked closely with the client’s design team to develop the concrete mix design, agreeing GGBS content, formwork systems, plywood and bolt hole layouts, and creating a sample panel to benchmark the required colour and consistency. Our jumpform design solution will achieve the client’s desired finish to the five new cores. The jumpform system will be prefabricated offsite at our facility in Luton, then delivered and installed directly into the footprint of the core.

Project
Blossom Street
Architect
AHMM
Engineer
AKT II
Contractor
Sectors
Commercial
Services
Demolition
Piling
Superstructures
Substructures
Basements
Location
London
Status
Current
Project summary
Project summary
Project
Blossom Street
Architect
AHMM
Engineer
AKT II
Contractor
Sectors
Commercial
Services
Demolition
Piling
Superstructures
Substructures
Basements
Location
London
Status
Current