Clean the construction with a high-pressure washer. Injectable holes of the diameter approximately up to 20mm are drilled with a hole punch at a distance of 30-50 cm at an angle of 45˚, in chessboard order.
The holes should be through, if it is necessary to create a waterproof layer on the outside of the structure and/or blind ones to seal fractures, cracks and other structural defects. Then, metal injection packers of the appropriate purpose are inserted into the holes. The diameter of the holes, the depth and their location are calculated separately for each case, since they depend on the state of the processed object and the technical specifications.