Coolant in fluid circuit for freezing ground - has fluid cooled below its freezing point inserted if additional cooling needed (OE 15.7.80)

摘要

The system is used for consolidating foundations, or singing shafts, It uses closed circulating fluid circuit, partially buried in ground to be frozen and contains a cooling medium with boiling point below 0 degree C. When the cooling effect is inadequate, the coolant is displaced from the part of the system laid in the ground. Fluid cooled to a temp. below the freezing point of the coolant is introduced, and then withdrawn after heat exchanged with the surrounding ground. Liq. nitrogen is a suitable fluid. This provides rapid, reliable ground freezing, and rapid adaptation to different heat quantities to be withdrawn.