| 摘要 |
<p>A resilient spider (108) is mounted on a monitoring well section (118) and has extension arms (113) which, in a flexed condition, allow a desired vertical movement of the monitoring well (W) relative to an auger (A) in a borehole, and in an unflexed condition, may be used to secure the monitoring well (W) in circumdisposed relationship to the lower end of the auger (A).</p> |
