Definition and applications

Micropiles are small diameter cylindrical holes (less than 300mm), into which a tubular metal frame is introduced, normally with a high elasticity limit. It is joined to the ground by the means of a pressure injection of cement grout or mortar.

Micropiling is an increasingly widespread technique, both in building and civil Works, used most commonly for the following:

• An element of foundations, transmitting forces generated by the structure to the surrounding ground (compression, bending or cutting forces).
• Underpinning of existing foundations, strengthening the foundation to the ground to prevent the settling that is taking place.
• A containment element, building screens of micropiles for the implementation of cellars of stabilising of slopes. In these cases, the micropiles are subjected primarily to bending stress.
• Canopies of micropiles for grouting tunnels.