Piled Extension in Frome, Somerset
There were many challenges on this job, the customer required 4 No triangular pads, each designed with 3 No 150mm dia Steel Cased Bottom Driven, Cast In situ Piles, to extend a 3 bedroom house. The extension is to be built between the existing house, and a public footpath, which means the new extension is triangular in shape and built right up to the perimeter fence. The access to site was down the 1.2m wide footpath, where all materials and equipment had to be manoeuvred. Upon further inspection it was found that the main sewer for the houses in the vicinity, was located under the corner of the existing dwelling and travelled down through the proposed extension. Advanced Mini Piling Systems redesigned the pad positions, and contacted the local water authorities, the answer was to move one of the pads, adding an extra pile, and pre boring all the Steel Cased Bottom Driven Piles, past the depth of the main sewer pipe, relieving the pipe of any pressure from the displaced material while the Piles were being driven.
The Piles in this pad were pre bored, beyond the depth of the mains sewer and had anti heave sleeve installed, which is the cardboard tube you can around the base of the Piles. The Piles were then driven to a pre-designed set, concreted with reinforcement, and then cut down to cut off level ( CoL ).