CPI-8 piles

CPI-8 piles, or continuous auger, are formed by drilling into the ground to the required depth using an auger encased in a hollow tube in one single action, so the bit must be at least the same length as the depth of the hole required. Whilst the auger is being removed, the pile is simultaneously filled with concrete. Finally, the reinforcement is introduced.

Continuous auger piles are used in the foundation of structures of all types, to transmit the load to a certain depth underground, if the surface does not offer the bearing capacity required.

These types of piles offer a number of advantages, whish is why it is one of the most commonly used deep foundation techniques, both in national and international environments. The said benefits are:

• In unstable ground, supporting pipes or slurries are not required to support the walls of the excavation. This is because the auger has a dual function of both drilling and supporting the ground.
• The pressure and volume of concrete can be controlled at all times.
• It allows the laying of the piles in consistent layers.
• It has a high yield, with no negative impact on the overall project timeline.
• A perfect verticality of the piles is achieved, thanks to the automated devices used to level our machinery.
• Good environmental work conditions and a near zero noise level.
• The piles can be left at the desired level and ready for implementation without cutting the pile caps later.

Execution

The phases of continuous auger piles are as follows:

• Positioning of the la machine at the location of the desired pile. Levelling of the machine to guarantee verticality of the excavation (our machinery is equipped with electrical systems that ensure the correct alignment of the auger at all times).
• Drilling to the specified depth by using an auger bit of the same length as the required excavation.
• Casting of the hole, by pumping concrete through the centre of the auger (which is hollow) and simultaneously removing the auger bit, which brings with it the dislodged earth. The concrete is in contact at all times with the auger bit. During the concreting process, the speed of ascent of the bit must be perfectly combined with the concrete flow and pressure to avoid splits in the shaft of the pile or subsections, and excess amounts of unnecessary concrete (our equipment is fitted with electronic systems that guarantee perfect execution of the piles).
• Re-enforcement of the concrete.