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Mini/Micro Segmental Piling (SFA) Segmental Flight Auger with hollow stem grout/concrete injection through the augers
This method is good for limited site access and limited height headrooms, for works we will use a range of rigs from a 3-Ton rig which can drill piles from 250mm up to 450mm in diameter, maximum depth 15m, up to a 15-Ton piling rig which can drill from 300mm diameter up to 600mm in diameter down to 17m. Augers come on 1m -1.5m section and are installed manually metre by metre down. This solution will work for wet, gravels, sandy ground conditions, the borehole will collapse after auger extraction. This method allows us to pump concrete through the middle of augers while slowly augers are taken out from the ground, filled concrete will stop the sides of the bored holes collapsing in. The next step is to install reinforcement in the hole to finish the pile off while the concrete is still fresh and wet. This method is vibration free.