| 摘要 |
PURPOSE:To minimize heat loss by preventing the bending or inclination of a frozen hole and to enable the sampling of a specimen without disturbance by holding underground stress, by forming a guide hole for drilling the frozen hole to a columnar main body formed of a heat-insulating member so as to have a desired dimension in the axial direction thereof. CONSTITUTION:An adiabatic apparatus 100 has a columnar main body having a cross-sectional dimension fitted to the part to be frozen of the grounded almost entirely formed of a heat-insulating member. The main body is constituted so as to connect an upper part 103, a middle part 104 and a lower part 105 by a connection metal fitting 106 and a guide hole 109 for drilling a frozen hole 108, a guide hole 11 for drilling a ground specimen sampling hole 110 and a guide hole 113 for drilling temp. measuring hole 112 are formed to the main body in the internal axial direction thereof. At first, an open end pipe 102 is used to drill a large caliber boring hole and the adiabatic apparatus 100 is arranged in said hole. Next, the frozen hole 108 is drilled down to the lower part of a freezing limit depth to form frozen soil 121 having a desired size. A specimen not disturbed can be sampled from the sampling hole 110 through the guide hole 111.
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