The micro piling technique is frequently used as a structural solution for foundations that are in need of repair.

The load of the structure is transmitted to the micro piles via the existing blocks, if their quality and integrity is sufficient, or by creating new foundations connected to the old ones. Furthermore, micro piles, as a structural solution, should have sufficient capacity to absorb the loads they will be submitted to (loads that could be compression, tension, cutting or bending).

In Works involving underpinning and reinforcement of foundations, micropiles have a number of advantages:

• Eliminates the need for the additional work of fixing the micropiles to the structure.
• Works can be programmed against time and cost.
• In industrial buildings, the system allows the continued development of its activities. In buildings with basements, Works can be completed without disturbing the contents. In road works, bridges and viaducts inconvenience to traffic is minimised.
• Inclined micropiles also absorb small horizontal forces.
• Drilling work does not transmit shocks to adjacent buildings or structures.

The characteristics, both geometrically (lengths, sections, layout, number of blocks) and structurally (the frame, quality of materials), of underpinning with micro piles is determined by the characteristics of the foundations, the ground and the geometry and integrity of the base being underpinned.

Furthermore, micro piles, as a structural solution, should have sufficient capacity to absorb the loads they will be submitted to (loads that could be compression, tension, cutting or bending).