Augercast deep foundation piles
Miceli, Francesco
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.
[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.
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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.
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April 26, 2012, www.windfarmbop.com [5]
URL to article: https://www.wind-watch.org/documents/augercast-deep-foundation-piles/
URLs in this post:
[1] Image: https://docs.wind-watch.org/pilotadora.jpg
[2] Image: https://docs.wind-watch.org/armado-pilote-3.jpg
[3] Image: https://docs.wind-watch.org/descabezado-pilotes.jpg
[4] Image: https://docs.wind-watch.org/pilotes-descabezados-y-listos.jpg
[5] www.windfarmbop.com: http://www.windfarmbop.com/augercast-deep-foundation-piles/