CUSTOM FOUNDATION SOLUTIONS
GTL provides supply and installation services using cutting-edge technology and expertise. GTL delivers foundation solutions tailored to each project’s requirements.
HELICAL SCREW PILES
The Helical pile is an an innovative pile technique, commonly used for projects that require quick installation that encompasses modular construction. The Helical (screw) pile is rotated into the ground by means of a bi-directional auger, hydraulically powered by an excavator. Throughout the excavation process, GTL monitor the installation torque and pile alignment.
ROTARY OR LARGE DIAMETER PILING
Rotary piling is generally used in dry stable soils and rocks, however in cohesion-less soils, piles may still be formed with the use of casing or drilling fluid to support the bore. We have specialist expertise in delivering large, complex, and technically challenging projects. In addition to the basic technique, we utilise specialist adaptations to suit certain ground conditions or site requirements.
CONTINUOUS FLIGHT AUGER PILING (CFA)
CFA piling is a particularly economical choice of piled foundation in sands, gravels, and low grade rock as this process requires no casings or drilling fluids. This solution is ideal for noise and environmentally sensitive sites for both load bearing piles and excavation support. Suitable for all soil types, CFA piling is fast to install and ideal for retaining walls as it causes minimal disturbance and poses limited risk to adjacent structures. The piles are constructed by injecting concrete through the hollow stem of the auger with the spoil being extracted in one continuous movement as the auger is withdrawn. After the pile head is cleared of debris, steel reinforcement is submerged into the high slump concrete.
Driven piling is used where soft and alluvial soils overlay dense sands and gravels, which then allows precast concrete and steel tube piles to be installed. Manufactured off-site, these piles are unaffected by ground water, produce no spoil, and can be used for immediate follow-on construction. Driven piles are installed by dropping a hammer weight on a pre-formed pile. When the pile moves a predetermined distance for a given hammer drop height, the pile capacity has been achieved.
Through our network of approved suppliers we are able to supply throughout the world.
Pile testing is recommended on projects where there are specific serviceability requirements or a requirement for proof of load carrying capacity. Load tests are used to either prove the maximum capacity of piles or verify predicted design values and settlement under pressure. Where the ultimate load is to be determined, the test should be conducted on a pile that is expendable to the main works. A working pile may be used as a test pile but the maximum test load should not generally exceed 1.5 x the safe working load.