FREEZIMG PIPE OF RECYCLABLE REFRIGERANT AND GROUND FREEZING METHOD USING FREEZIMG PIPE

The present invention discloses a freezing device capable of recycling refrigerant and a soil freezing method using the same. The freezing device capable of recycling refrigerant comprises multiple freezing pipes (100) including an outer pipe (101) which has a refrigerant inlet (102) and a refrigerant outlet (103) formed at the upper part thereof; an inner pipe (104) of which lower end is opened and which is mounted inside the outer pipe (101); and an inflow pipe (105) for connecting the refrigerant inlet (102) with the inner pipe (104), wherein the freezing pipe (100) includes a main freezing pipe (110) for receiving liquid refrigerant (300a); and an auxiliary freezing pipe (120) for receiving gas refrigerant (300b) discharged from the refrigerant outlet (103) of the main freezing pipe (110), and the freezing device further comprises a connection pipe (200) of which one end is connected to the refrigerant outlet (103) of the main freezing pipe (110) and of which the other end is connected to the refrigerant inlet (102) of the auxiliary freezing pipe (120), thereby increasing usage of refrigerant and securing economic feasibility and constructability by maximizing a frozen area of soil with a small amount of refrigerant.