Here is described the method for strengthening (and construction) of the pile foundation for the machines under dynamic loads or vibration-sensitive equipment, allowing the reduction of their vibration level. It involves injecting of cement-sand mixture into the ground under the foundation frame foot for hardening and involving additional volume of soil mass for collaboration with the foundation. This leads to reducing the performance problem of the pile foundation vibration under dynamic loading and in case of base excitation. The injection is performed at several points situated between piles or around the perimeter of the foundation frame. The penetration of injectors is performed through the specially provided holes, i.e. injecting conductors. The parameters of injecting works (the number of injection points and their placing according to the plan, high-altitude position of injection horizons, required volume of injected mortar, the sequence of injection, etc.) are set depending on the pile foundation construction, geotechnical conditions of the site, dynamic equipment operating mode and other factors.
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