| 摘要 |
<p>The method involves putting an annular body with round or an optionally polygonal shaped body similar to a cylinder over a region of drill head or pipe section near the Earth surface or at the bottom of the sea. A space, formed between a wall of the annular body and the Earth surface or the wall of the annular body and the bottom of the sea, is partially filled with heavy pieces of suitable size and corresponding thickness. Another annular body is sealed and set on the former annular body, and is filled with the heavy pieces in a similar manner.</p> |
