| 摘要 |
<p>A drag embedment normal load anchor (2) (referred to as a Denla) comprises a fluke (4) with a shank (5) pivotally attached thereto, the shank (5) including an anchor cable attachment point (6) and control or restraint means (12, 14, 18, 19, 21) whereby the shank (6) can be set such that the cable attachment point (6) can lie selectively in first (9) second (11) and third (12) directions relative to the fluke controid (10), said directions providing three fluke centroid angles ('alpha', 'beta' and ) respectively with the fluke forward direction (F). The Denla (2) is part of an anchoring apparatus (1) including a rear drogue line (3) serving to orientate the anchor correctly at the sea bed without the need for a separate pendant line. In operation, the Denla (2) is embedded by pulling on an anchor cable (7) with the first fluke centroid angle 'alpha' present; when the desired horizontal anchor loading is achieved, the shank (3) is moved to the second larger centroid angle 'beta' and the anchor swung back until the fluke forward direction (F) is inclined upwardly, this position constituting the normal load anchoring position. For Denla retrieval, the shank (5) is swung forwardly to occupy the smaller third fluke centroid angle , and the anchor pulled upwardly in the inclined fluke forward direction (F). The restraint/control means are preferably located in a grease filled housing (40) for protection and a further fluke centroid angle lower than the first centroid angle can be provided for the shank (5) to ensure satisfactory initial burying of the anchor. The invention enables setting of the Denla (2) and also retrieval using a single line i.e. the anchor line (7).</p> |
