| 摘要 |
PURPOSE:To utilize the pressures of frozen soil and soil of the upper part as a reaction force by a method in which a refrigerant is charged in a circulating manner into a bottomed tube through an injection tube and a discharge tube in such a way as to cause the soil surrounding the bottomed tube to freeze. CONSTITUTION:A bottomed tube 3 is penetrated into a pit and buried to a given depth by additionally connecting a sheath tube 15 and a threaded bar 5 to the tube 3 through a coupler 14. A refrigerant is then injected from an injection tube 7 into the bottomed tube 3 and discharged from a discharge tube 9 in a circulating manner. During the process, the soil surrounding the bottomed tube 3 is frozen and the pressure of the soil around the bottomed tube 3 is increased by the freezing expansion of the soil. Therefore, reaction support can be obtained by the frozen soil and the soil pressure above the frozen soil. |
