Piled Basement, London

Clapham common Basement:

Project Brief;

This was a very challenging site, with tight access on a small street, and a very small open site. The property is a modern three storey town house which was built in 2006 and was built off piled block and beam foundations. A single storey extension to the side of the property was demolished, and the piles and beams removed. This allowed for the installation of a Contiguous piled retaining wall, to be installed around the perimeter of the garden, once excavated this would give the client a basement and access to excavate under the rest of the house.

Because the property is built off piled reinforced beams, these would support the building while the R/C works are taking place, and removed once the transfer slab is completed. Although the site was very narrow (about 4.0m) we managed to complete the piles using are largest piling rig. This allowed us to work more efficiently, as we could have the reinforced cages fabricated on site to the required length of 10.0m, which could then be winched in to the open bores in one lift. Also our daily meter rate is higher and it requires less labour than smaller rigs, keeping down costs.

Scope of works;

*Mobilise to site 14.0 t Doosan Kelly bar rig on a low-loader.

*Welfare facilities provided by main contractor.

*Loading plan put in place, with protection to the drive way.

*Safe working zone for steel fixers.

*Site marked out by main contractor using 500mm pins with caps on.

*Required number of piles installed and concreted.

*Site, pavement and road cleaned on a daily basis.

Doosan 140 lcv with rotary auger mast, difficult site but was completed quickly an safely.
Doosan 140 lcv with rotary auger mast, difficult site but was completed quickly and safely.
Ground floor wall of existing property is removed.
Ground floor wall of existing property is removed.
Capping beam is cast on top of piles, and basement is excavated.
Capping beam is cast on top of piles, and basement is excavated.
Contig wall piles are fitted around existing beam, which is still supporting the main house.
Contig wall piles are fitted around existing beam, which is still supporting the main house.
The load of the existing house wall, is transferred through steel columns down onto the floor slab, and the block and beams cover the basement, and can then be built off.
The load of the existing house wall, is transferred through steel columns down onto the floor slab, and the block and beams cover the basement, and can then be built off.

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