PROCEDIMIENTO DE CONGELACION DE UN SUELO, DEL TIPO EN EL QUESE ENFRIA UN LIQUIDO REFRIGERANTE POR INTERCAMBIO DE CALOR CON UN FLUIDO CRIOGENICO

摘要

The injection of liquid nitrogen into the probe (2) is regulated in an on-off manner so as to maintain the temperature of the ground at the coldest point above a value within the range of between -140 DEG C. and -160 DEG C. so as to cause calefaction of the liquid nitrogen. The liquid nitrogen is alternately injected into the central passage (9) and into the annular passage (11) of the probe, these passages being thermally insulated from each other.