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Resource Documents by Miceli, Francesco

Miceli, Francesco
Anchor cage foundations
Anchor cage foundations are an alternative to the embedded ring and they will be a de facto standard in the future. Basically an anchor cage is a set of bolts, kept together by inferior and superior steel rings. It normally arrives disassembled to the site, and it is mounted by workers in a few hours. The main advantage is a better transmission of loads to the concrete: sometimes a separation of the embedded ring from the concrete is observed, normally . . . Complete article »

Miceli, Francesco
Embedded ring foundations
Embedded ring is one of the 2 solutions currently used in onshore wind farm foundations. Basically [it] is a steel cylinder with several holes: a set of holes all around it to allow radial steel reinforcement bars to cross it and another set of holes for the passage of medium voltage cables and the earth copper wire. This element is lifted with a crane, and it is put on the foundation hole, above the blinding concrete. Then the topographer levels . . . Complete article »

Miceli, Francesco
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. 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 . . . Complete article »

Miceli, Francesco
Cracks in onshore wind turbine foundations
The appearance of fissures in wind turbine foundations is a rather common event. There is no consensus in the sector about the root cause of the cracks. You can find a comprehensive family tree of fracture types below: From my experience it seems that old foundations with embedded ring are more prone to fissures compared to the new foundations with anchor cage. Among the foundations with embedded ring, high pedestal foundations like the one in the following picture are the . . . Complete article »

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