Process and installation for freezing soils by means of a...

E - Fixed Constructions – 02 – D

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E02D 3/115 (2006.01) E02D 19/14 (2006.01)

Patent

CA 1269852

ABREGE DESCRIPTIF L'injection d'azote liquide dans la sonde est régulée en tout ou rien de façon à maintenir la température du sol au point le plus froid au-dessus d'une valeur com- prise dans la plage -140°C, -160°C, de façon à assurer la caléfaction de l'azote liquide. L'azote liquide est alternativement injecté dans le passage central et dans le passage annulaire de la sonde, lesquels sont isolés thermiquement l'un de l'autre. De cette façon on garantit que l'écart de température entre la paroi de la sonde et le liquide cryogénique est suffisant pour provoquer en permanence la caléfaction du liquide cryogénique au contact de cette paroi.

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