At GeMech we offer restricted access / mini-piling through both augered Sectional Flight Auger (SFA) and steel cased bottom driven piles. Our rigs are specially adopted to work within existing buildings where access and overhead working restriction causes concern.
SFA piles are constructed in the same manner as CFA piles, where concrete is pumped through the hollow stem of the rig and reinforcement placed in into the pile bore. The auger string is ‘built’ and removed incrementally due to the reduced mast height of the piling rig.
Steel cased bottom driven mini piles can be installed using both hand-held techniques as well as rigs with mast heights as little as 2.0m. Piles are constructed by driving a close ended tube, using a free-fall hammer into a dense ballast plug at the bottom of the casing. Additional casing is welded as required to achieve required depth. Once a designed set is achieved, piles are concreted and a reinforcement cage is inserted.
The steel cased bottom driven system is associated with low levels of noise and ground borne vibration. Piles of this nature are therefore well suited for operating within existing structures, as well as negating spoil arisings.
Contact our expert piling team/engineers for advice on your project and get a no obligation quote