FIELD: hydraulic engineering. SUBSTANCE: device has freezing columns 1 with liquid heat-transfer agent continuously intersecting the dam in height, vented gallery 3 in base 4 and thawed ground 5. Each column 1 consists of outer pipe and inner pipe arranged coaxially in outer pipe at spaced relation. Outer pipe is rigidly secured in crown and bottom of gallery 3. Within interior of gallery, pipe has increased outer diameter and is provided with fins, thus forming heat exchanger 10 inside vented gallery. EFFECT: enhanced efficiency. 4 cl, 3 dwg
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