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Augercast deep foundation piles 

Author:  | Photos, Spain, Technology

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

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

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

pilotes-descabezados-y-listos

April 26, 2012, www.windfarmbop.com

This material is the work of the author(s) indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

The copyright of this material resides with the author(s). As part of its noncommercial educational effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations. Queries e-mail.

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