61 Oxford Street

London W1

Temporary Works: Party Wall Support and Tower Crane Foundation Design
 Wates / John F. Hunt
Project value: £22m

CDS worked for both the demolition contractor (John F Hunt Demolition Ltd.) and the new-build contractor (Wates Construction) on this site of a late Victorian building, constructed as a public house in 1880, which was formerly the location of the London Dolphinarium in the 1970’s, and was being developed into an eight storey development combining retail, office and duplex residential apartments.

During the demolition phase, CDS advised on underpinning sequences, designed basement propping and party wall support works, and completed the Approval in Principle (AIP) process to satisfy Westminster City Council.

The temporary support of the party wall to the neighbouring Radha-Krishna temple was CDS’s main design task during this time and this was achieved by bracing the existing structure adjacent to the party wall and leaving this part of the building frame intact until the construction phase.

During the construction phase, the new RC core was constructed early in the programme and CDS designed the scheme for re-supporting the Radha-Krishna party wall to allow the retained braced original structure to be removed. This scheme comprised horizontal tubular props and steel walings replacing the support previously given by the original structure. The use of horizontal propping left the basement area clear for the new works to be completed unhindered.

CDS advised Wates on the use of the basement raft to incorporate their first tower crane, and also designed the steel grillage required to support the second tower crane, located on the edge of the roof, once the main structure was complete.