Lifting and repairing foundations

A method for lifting and repairing a foundation, comprising:

• digging a well below at least one lateral surface of the foundation, at least one third of an opening of the well being covered by a part of the foundation;
• installing a shear plate to the at least one lateral surface of the foundation inside the opening of the well;
• further digging the well to a maximum depth of 6 m;
• compacting a bottom surface of the well at the maximum depth of 6 m by dynamic hammering the bottom surface of the well;
• forming a layer of gravel by pouring a first plurality of gravel particles inside the well;
• compacting the layer of the gravel by dynamic hammering the layer of the gravel;
• placing a double column inside the well, the double column being fixed to the shear plate;
• pouring a second plurality of gravel particles into the well, the second plurality of gravel particles filling around the double column in the well;
• forming a cemented gravel layer by injecting a first amount of cement slurry into the well to fill empty spaces among the second plurality of gravel particles;
• installing a tensile system on top of the double column, the tensile system being fixed on the shear plate;
• forming at least a vacant space between the foundation and ground by lifting the foundation from the ground using the tensile system;
• and
• fixing the foundation by injecting a second amount of cement slurry into the vacant space.