Ground freezing

• Power soil and vibration resistance increases, and this allows the necessary excavations.
• Environmentally friendly - no materials are added or removed from the earth, and it provides a safe working environment.
• Elimination of ingress of water - water flow in the excavation stopped, thus avoiding the need for pumping and depletion of the aquifer.
• Versatile - can be applied in many situations.
• Speed and very cost-effective in comparison with alternative methods.

freezing is achieved by driving the ring of vertical freeze pipes in the ground, passing cooled brine down through the inner tube so that it flows up ring, cool and eventually freeze surrounding wet soil. This process continues until the frozen soil is building a continuous wall around the proposed excavation. Depths of over 650 m were found in this way. Calcium chloride brine, refrigerated private mini-mounted coolers, used as a secondary coolant. As a rule, ammonia refrigerant cooling of the heat-carrier up to -25C in the refrigeration machine with a capacity from 100 up to 500 kW; lower temperatures are possible in case of need.

Cryogenic methods using liquid nitrogen, and it is especially effective for fast operations, and search and rescue situations...