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Control piles are a special foundation consisting of point-bearing piles that freely penetrate the foundation slab, at the head of which is placed a device to control the pile load and the settlement of a structure. These devices eventually allow the pile to be completely unloaded to induce corrective movements in the case of buildings with differential settlements or apparent protruding. Therefore, control piles have been widely used in Mexico City for the underpinning of buildings with problems of differential settlements and tiltings. In this paper, the case of a building with a foundation that was underpinned with control piles to correct a maximum differential settlement of approximately 1 m is briefly described. The underpinning was combined with the sub-excavation technique to accelerate the process of the releveling of the building. Both the underpinning and the releveling were carried out within a year.
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