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Raft rescue


Croydon-based subsidence repair specialist Withers appeared recently on Channel 4's Room for Improvement.

At just over £110,000, the contract value is high for the domestic property featured and indicates the severity of the subsidence at the threebedroom bungalow in Chessington, Surrey.

Withers proposed a piled raft solution consisting of 55 bored 250mm diameter piles and a 250mm thick reinforced concrete raft to support the building.

In a highly plastic clay subsoil with trees surrounding the front of the property (on a slightly sloping site), 10m deep piles sleeved for heave in the top 3m was an economic and far safer solution compared with a traditional hand dug approach.

The piles were installed internally with a TD 308 Piling rig, which can negotiate the width of an internal door frame, removing the need for walls to be demolished.

Withers used its technologybased management system, withersnet, to fast track the project and allow the client, WCJ Engineers access to the job file at all times via the internet for up to date information.

Withers had total responsibility for all the enabling works, piling, raft construction and subsequent reinstatement and repair works.

The occupiers also used the piling to their advantage by creating a modern extension to their property.

Withers' website includes a video link to the Channel 4 programme.

www. withers-group. co. uk

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