| 摘要 |
FIELD: hydraulic building, particularly to create water-tight frozen shields having height up to 100 m or more. ^ SUBSTANCE: device comprises freezing column arranged in borehole, outer heat exchanger which transfers heat from liquid coolant to source of cold and pump to provide coolant circulation. Freezing column is made as two coaxial tubes, namely outer, freezing, and inner, supplying, ones. Freezing tube is formed of metal. At least part of supplying tube adjoining borehole head is formed of material with low heat conductivity or supplying tube comprises material with low heat conductivity in cross-section thereof. Outer and inner tubes define annular channel for liquid coolant circulation. Upper part of borehole and part of outer tube adjoining borehole head have the greatest diameters. Gap is created between outer tube wall and borehole wall. The gap is filled with filling material taken in the form of particles having high heat conductivity in amount corresponding to predetermined particle concentration along channel length. Particle concentration in upper part adjoining borehole head is maximal. ^ EFFECT: increased operational efficiency due to increased capacity of liquid coolant unit to carry away heat from ground related to tall freezing column as a whole and to separate parts thereof along with uniform distribution of heat removed from freezing column parts. ^ 8 cl, 1 tbl, 5 dwg |
