- National Wind Watch: Wind Energy Documents - https://www.wind-watch.org/documents -

Augercast deep foundation piles

The following pictures are from a wind farm where due to the weak conditions of the subsoil a deep foundation with piles has been necessary, using a technique known as continuous flight augering (CFA).

As you can see, with the same machine we drilled and pumped the concrete in the hole.

pilotadora [1]

A dry hole has been made, without the use of bentonite or others drilling fluids to maintain vertical the walls of the hole: the earth is removed using an Archimedes’ screw, and than concrete is pumped inside the hole, slowing lifting the tool.

The machine uses a manometer to know the pressure used to inject the concrete in every moment: this way, it is possible to detect if there are holes underground.

Then, the reinforcement bars are lifted using a crane and carefully inserted in the hole. Small plastic wheels are positioned at the sides of the steel structure to make easier to lower it in the hole.

armado-pilote-3 [2]

When the concrete hardens, after about a week, the head of the piles is removed using drills, leaving the steel bars clean and ready for the construction of the foundation.

descabezado-pilotes [3]

pilotes-descabezados-y-listos [4]

April 26, 2012, www.windfarmbop.com [5]