| 摘要 |
<p>The tube (2) has an end (4), and another end (6) arranged at a distance from the former end around the length of the tube. The latter end is lowered into soil. A longitudinal section (8) is turned towards the former end, and another longitudinal section (10) is connected to the former longitudinal section. Standard dimension ratio value of the tube is calculated based on equation relating to tube outer diameter (da) and tube wall thickness, where the value is constant over the length of the former longitudinal section and decreases towards the latter end.</p> |
