Project London, United Kingdom

Grosvenor Crescent

Redevelopment of a high-end residential Grade II listed building

Sector: Buildings

The complete re-development of an early 19th-century Grade II listed building, transformed into high-end, private residential apartments in a highly sought after location.

Technical Specifications

Pile Type: Secant & Bearing

Number of Piles: 365no.         

Diameter: 750mm 

Depth: 26m

The Challenge

11-15 Grosvenor Crescent was a major redevelopment project for high-residential units, incorporating a double basement for car park and leisure activities. Access to the site was restricted due to a tight mews access, with temporary works flying shores restricting part of the site at 16.0m above PPL. Due to different developments there were multiple clashes between existing and proposed piles. 

The Solution

Martello Piling were able to provide multiple rigs to ensure maximum production to meet the client's tight construction programme. The smaller sized MP5000 series rigs were easily maneuvered to operate alongside the other ongoing site operations, without sterilizing the site movement of equipment for spoil and obstruction removal. 

Furthermore the MP5000 series rig was able to form the piles very close to the existing boundary constraints, thereby maximizing the size of the basement for the developer, and hence maximizing their revenue. 

Forming a secant wall, Martello installed 145 female and 145 male 750mm diameter piles up to 25.0m deep along with 900mm diameter with bearing piles installed at 900mm diameter to 35.0m deep. 

In order to eliminate the coring out of the existing piles, the piles had to be incorporated into the structure. With accurate surveying the secant line was altered to fit around the existing piles. The adjacent piles' diameter and reinforcement was increased to maximize the moment carrying capacity. The maximum wall deflection recorded was 12mm. 

Project details

Project name

Grosvenor Crescent




Large diameter bored pile under casing, Secant Pile Wall

Contract type



London, United Kingdom



Building Period

2015 - 2015

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