| 摘要 |
<p>A piering device employs a threaded shaft (10) and a helical bearing plate (20) with a threaded passageway (22) that allows the helical plate (20) to be advanced to any desired location along the shaft (10). The helical plate (20) can also be readily replaced with one or more helical plates of different sizes. The threaded shaft (10) has a key way (14) extending along its length. The threaded passsageway (22) of the helical plate (20) can also be equipped with a key way (24) extending its length. A key (26) is removably inserted into the shaft key way (14) and helical plate key way (24) after these key ways (14, 24) have been rotated into alignment to secure the helical plate (20) at the desired location along the shaft (10).</p> |
