| 摘要 |
<p>The method installs a heat-exchange probe formed by a tubular boring shaft with a head and tool at the bottom end, this being driven vertically into the ground while a flushing liquid is passed down through the shaft so as to remove the spoil. After drilling is complete, the shaft is left in the borehole and its lower end accommodating the tool is sealed off. An inner tube in the shaft forms with it an annular space connected to the interior of the inner tube at the bottom, and a heat exchange fluid is passed in succession through the annular space and the inner tube.</p> |
