Foundation contractor Piling Solutions has installed piles to support signs along the M4 motorway between junctions 26 and 33 in South Wales.
Working for client the National Assembly for Wales and main contractor Wrekin Construction, Piling Solutions designed 12 bases based on site investigation data. The piles are 500mm diameter and range in depth from 8m to 15m, with four piles per base. WS Atkins was the consultant.
The piles were formed with a hollow stem auger. Concrete was tremied into each pile through the hollow stem before an 8m long reinforcement cage was placed, followed by a single 40mm diameter reinforcing bar placed to the full depth of the pile.
Due to the presence of boulders beneath some of the bases Piling Solutions is drilling the pile positions in advance of the main piling rig using a Casagrande C6 and a 300mm diameter down the hole hammer to depths of up to 15m.