HYDROTECHNICAL CHANNEL ON PERMAFROST SOILS OF SLOPE AND COOLING DEVICE OF EMBANKMENT (VERSIONS) Russian patent published in 2011 - IPC E02B5/00 

FIELD: construction.

SUBSTANCE: hydrotechnical channel comprises a bed formed with a channel bottom and slopes of its sides and arranged higher than the lower border of a seasonally melting layer. The upper side of the channel is formed with a slope, and the lower side - with an embankment, where a frost curtain is arranged by means of seasonally functioning cooling devices installed along the embankment. A cooling device according to the version 1 comprises two external heat exchangers installed along the frost curtain length at the distance from each other, which release heat of a liquid coolant during its natural convection to a cold ambient air, and a soil heat exchanger formed by two freezing pipes. The external heat exchanger represents a tube expander, and the soil heat exchanger comprises two freezing pipes bent along the length and located in the soil along the embankment between tubular expanders and at the specified distance from each other. One freezing pipe is located within the borders of a seasonally melting layer and is hydraulically communicated by an inlet end to a lower part of one tubular expander, and by an outlet end - to a middle part of the other tubular expander. The other freezing pipe is hydraulically communicated by its inlet end to the lower part of the second tubular expander, and by its outlet end - to the middle part of the first expander. The diameter of tubular expanders is more than the diameter of freezing pipes, and drain holes of outlet ends of freezing pipes are arranged at the same level. Connection of freezing pipes ends to at least one tubular expander is made by means of flange joints, every of which is equipped with a gasket of heat insulation material. A cooling device according to the version 2 comprises three external heat exchangers installed serially along the embankment length at the distance from each other and two soil heat exchangers installed serially along the frost curtain in soil. Each external heat exchanger represents a tube expander, and each soil heat exchanger comprises two freezing pipes bent along the length and located in the soil along the embankment between the middle and the extreme tubular expanders and at the specified distance from each other. One freezing pipe of the pair is located within the borders of a seasonally melting layer and is hydraulically communicated by an inlet end to a lower part of the middle tubular expander, and by an outlet end - to a middle part of the extreme tubular expander. The other freezing pipe of this pair is hydraulically communicated by its inlet end to the lower part of the extreme tubular expander, and by its outlet end - to the middle part of the first expander. Drain holes of all (four) outlet ends of two pairs of freezing pipes are arranged at the same level. Connection of freezing pipes ends to extreme tubular expanders is made by means of flange joints, every of which is equipped with a gasket of heat insulation material.

EFFECT: improved reliability of the channel.

3 cl, 5 dwg