The piles were grouped into a variety of cap and slab configurations and positioned to suit the relatively tight site dimensions. The site constraints allowed for the utilisation of only one rig. The piles were required to be constructed from the existing ground level and prior to the basement excavation. The design was conducted in accordance with Eurocode 7.
Ground Conditions
The upper 3.5 to 5.0m comprised highly variable made ground. This was underlain by the Hackney Gravel member, which extended to a depth of approximately 10.5 metres below ground level. The Hackney Gravel member was subsequently underlain by the London Clay formation. The ground water was static and located in the Hackney Gravel member at a depth of 6.7m. The proposed basement required the pile cut-off levels to range between 6.0 and 7.5m below the existing ground surface.
Solution
The bearing piles were designed to diameters of 600mm, with lengths ranging from 21.1 to 28.3m below the existing ground surface. All the piles were founded into the London Clay formation. The method of installation was continuous flight auger (CFA) execution using a Soilmec SF-65. In order to utilise lower partial ground resistance factors, one working pile load test was carried out. The load test results were sufficient to satisfy the relevant serviceability requirements.
All access, egress and delivery operations were tightly monitored and coordinated throughout the duration of the project. Due to the high pedestrian footfall and vehicle/cycle traffic the area was particularly sensitive to heavy plant movement and bespoke logistical management was paramount to our success on this contract. Special care was also taken to comply with contractual stipulations associated with the immediate surrounding residential and commercial properties.
1 PHIPP STREET, LONDON PROJECT SHEET
RELATED CASE STUDIES
Calcutta Road, Tilbury
Central Piling has completed a piling contract to enable essential homes to be built for residents in Tilbury, Essex.
Canada Water, London
Central Piling has completed a major piling contract that is enabling King’s College London to build new high quality student accommodation in southeast London.
Napier Gateway, Luton
Central Piling enabled construction to begin on a major regeneration scheme that will bring much-needed housing and amenities to a former industrial area in Luton.
The Hyde, Hendon
Central Piling has played an important role in helping one of the UK’s leading housing companies regenerate a former industrial site for much-needed housing and amenities. The Hyde in north London is a landmark development of 387 homes (including 139 shared ownership and 34 affordable rent) and 647m2 of community facilities and commercial space.
Caxton Street, Royal Gateway Development, Canning Town, London
As part of the redevelopment of Galliard Homes a new residential Development is to be developed.
306-308 Barking Road, Newham, London
The client required a basement to be constructed as part of the works at Barking Road. To enable this it was considered that, due to the high ground water table, a secant piled wall was the best solution.
3 Park Place Villas, Holland Park, London
The challenge of this project was to form a double basement underneath and to the rear of this listed building in order that a swimming pool and gym area could be provided. Access for all equipment was restricted to 1.8m width and in some areas 2.5m in height.
New Metrobank, Aylesbury, Buckinghamshire
The challenge of this project was to form greater/larger space within a confined space in a listed building to provide banking financial services. Access for all equipment was restricted to 1.8m width and in some areas 3.5m in height.
Freckleton Street, Montague Street Link New Bridge Works, Blackburn
Piles were required for abutments for a new bridge across the river Blakewater in the northwest of England.
Epsom Downs Racecourse
As part of the redevelopment of Epsom Downs Racecourse a new grandstand is to be constructed.