Embedment anchor

B - Operations – Transporting – 63 – B

Patent

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114/58.5

B63B 21/28 (2006.01)

Patent

CA 1220096

ABSTRACT OF THE INVENTION An improved, explosively embedded anchor assembly for use in sedimentary strata and similarly nonconsolidated or rocky ocean bottom surfaces is shown. The anchor provides, through improved design for secure holding within relatively soft bottom strata. In addition, is provides accurate posi- tioning, as is required for mooring points for moored buoyant and semi-submersible vessels, as are encountered within oil drilling and the like offshore. The anchor comprises an inertially loaded reaction member above a substantially elongated anchor shaft, coaxially positioned around an elongated drive tube assembly. The anchor shaft has a number of open cross-section triangular sheet metal anchoring fins, providing substantially low resistance to penetration within the strata, but providing substantially high resistance to sideways displacement forces, as would be imposed through a standard anchor rode. The anchor is positioned by lowering the inertial reaction unit and embedded by the weight of the inertial reaction unit a distance into the surface layer of the subocean strata. An internal detonator control assures vertical embedment of the anchor and prohibits firing of the explosive for embedment unless the anchor is vertically positioned. The anchor is remotely fired after initial embedment. The particular explosive has a relatively low velocity explosive wave, and jets the anchor shaft downward from around the drive tube, providing a substantially deep subsurface embedment. The combination of relatively long drive period, low embedment velocity, the substantially elongated drive contact between the reaction member and the -1- anchor member, and the substantially elongated dimensions of the anchor member provide a well secured accurately positioned, explosively embedded anchor as is required for an accurate, deep sea anchoring array. -2-

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