We execute concrete piles for ground improvement under the foundation and for retaining walls, having the following technologies:
CONTINUOUS FLIGHT AUGER (CFA)
■ CFA piles are a fast and vibration-free method, suitable for environmentally sensitive areas. A continuous auger inside which the concrete is injected is inserted to the desired depth. Concrete is poured gradually, while the screw is extracted. Then the reinforcement is inserted before the concrete hardens.
CFA WITH VIBRATED CASING
● In granular, weak cohesive or non-cohesive soils, the CFA option becomes impossible, with the need for protection with bentonite or steel casing. Because the speed of execution is a priority for us, but also because in this way we obtain a higher quality pile, we chose to provide the CFA solution with vibrated steel casing.
● In practice, on the construction site, in addition to the drilling rig, there is also a vibro-hammer mounted on a crane. The two machines work together. Several steel tubes are brought to the site for optimum flow. After concreting and introducing the reinforcement housing, when the steel tube is extracted by vibration, the concrete vibrates, ensuring optimum pile quality.
Other piling technologies implemented by our teams:
▸ Screw piles are a steel screw-in piling and ground anchoring system used for building deep foundations. Screw piles are manufactured using varying sizes of tubular hollow sections for the pile or anchors shaft.
▸ Micropiles are small diameter drilled and grouted friction piles. Each pile includes steel elements that are bonded into the bearing soil or rock – usually with cement grout.
PRECAST CONCRETE PILES / FULL DISPLACEMENT PILES
▸ Precast Concrete Piles may be defined as a reinforced concrete pile which is moulded in circular, square, rectangular or octagonal form. The precast concrete piles are cast and cured in a casting yard and then transported to the site for driving.