A restraining device, such as a bolt, pin, or latch, removably secures a connector sleeve to a U-bolt, such as a tow-rope-eyelet on the bow of a boat hull. The connector sleeve is machined with an internal cavity having surfaces and dimension that correspond to outer surfaces of the U-bolt. The sleeve contains holes through which the restraining device passes after the sleeve has been slid over the U-bolt such that the restraining device, while installed, prevents the sleeve from sliding back off of the U-bolt. The sleeve also includes accessory mount holes to receive restraining devices that attach an accessory, such as a ladder, to the sleeve and thus to the boat via the sleeve that has been secured thereto. The sleeve may provide for set screws to snug the sleeve to the U-bolt if clearance exists between surfaces of the cavity and the U-bolt.

A modular multipurpose offshore operation platform comprises a floating structure having a lower portion submerged below the surface of the sea, and a platform structure provided at an upper surface of the floating structure. An integrated work platform comprises at least two modular multipurpose offshore operation platforms. Framework structures of two adjacent operation platforms are detachably and fixedly connected, and floor boards of the operation platforms collectively form a deck. A transportation method transports goods to the platform by means of a hoist, and a hoist bracket with a rotating roller. The platform can achieve standardized production, and is flexible and has multiple functions.

A shallow water anchor and related methods are provided. The shallow water anchor includes a four-bar linkage and a hydraulic actuator for actuating the four-bar linkage. An anchoring element is connected to the four-bar linkage. A hydraulic control arrangement operates the hydraulic actuator to transition the hydraulic actuator between stowed and deployed positions and vice versa. The shallow water anchor can incorporate a controller which monitors a current limit, a pressure limit, or both to perform a variety of anchoring functions.

A shallow water anchor and related methods are provided. The shallow water anchor includes a four-bar linkage and a hydraulic actuator for actuating the four-bar linkage. An anchoring element is connected to the four-bar linkage. A hydraulic control arrangement operates the hydraulic actuator to transition the hydraulic actuator between stowed and deployed positions and vice versa. The shallow water anchor can incorporate a controller which monitors a current limit, a pressure limit, or both to perform a variety of anchoring functions.

A hydraulic piston spud pole for anchoring a vessel may comprise an elongate sleeve having a top, a hydraulic inlet, and a bottom terminating in a bottom aperture, a portion of the elongate sleeve being formed to contain a hydraulic column; a spud pole having a piston vertically-movably seated within the elongate sleeve; and a pump assembly connected to the hydraulic inlet that is preferably activated by a controller to lift or drop the spud pole. The elongate sleeve may comprise a vertically-extending inner surface and a sleeve bearing, and the spud pole may comprise a vertically-extending outer surface configured to fit closely against the sleeve bearing while the piston fits closely against the elongate sleeve's vertically-extending inner surface. The hydraulic column may be defined between the vertically-extending outer surface of the spud pole, the vertically-extending inner surface of the elongate sleeve, the piston, and the sleeve bearing.

A hydraulic piston spud pole for anchoring a vessel may comprise an elongate sleeve having a top, a hydraulic inlet, and a bottom terminating in a bottom aperture, a portion of the elongate sleeve being formed to contain a hydraulic column; a spud pole having a piston vertically-movably seated within the elongate sleeve; and a pump assembly connected to the hydraulic inlet that is preferably activated by a controller to lift or drop the spud pole. The elongate sleeve may comprise a vertically-extending inner surface and a sleeve bearing, and the spud pole may comprise a vertically-extending outer surface configured to fit closely against the sleeve bearing while the piston fits closely against the elongate sleeve's vertically-extending inner surface. The hydraulic column may be defined between the vertically-extending outer surface of the spud pole, the vertically-extending inner surface of the elongate sleeve, the piston, and the sleeve bearing.

In a general aspect, an anchor includes a tubular body that is formed at least in part of cementitious material and has open and closed ends. The anchor also includes a pad eye coupled to the tubular body and configured to couple to a mooring line. The tubular body includes a base wall, a perimeter wall, and a shear key. The base wall defines the closed end of the tubular body and has first and second surfaces on opposite sides of the base wall. The perimeter wall extends from the first surface of the base wall to the open end of the tubular body, and the shear key extends from the second surface of the base wall. The shear key is configured to penetrate an underwater floor and resist a lateral displacement of the anchor along the underwater floor when penetrated therein.

In a general aspect, an anchor includes a tubular body that is formed at least in part of cementitious material and has open and closed ends. The anchor also includes a pad eye coupled to the tubular body and configured to couple to a mooring line. The tubular body includes a base wall, a perimeter wall, and a shear key. The base wall defines the closed end of the tubular body and has first and second surfaces on opposite sides of the base wall. The perimeter wall extends from the first surface of the base wall to the open end of the tubular body, and the shear key extends from the second surface of the base wall. The shear key is configured to penetrate an underwater floor and resist a lateral displacement of the anchor along the underwater floor when penetrated therein.

In a general aspect, an anchor includes a tubular body that is formed at least in part of cementitious material and has open and closed ends. The anchor also includes a pad eye coupled to the tubular body and configured to couple to a mooring line. The tubular body includes a base wall, a perimeter wall, and a shear key. The base wall defines the closed end of the tubular body and has first and second surfaces on opposite sides of the base wall. The perimeter wall extends from the first surface of the base wall to the open end of the tubular body, and the shear key extends from the second surface of the base wall. The shear key is configured to penetrate an underwater floor and resist a lateral displacement of the anchor along the underwater floor when penetrated therein.

In a general aspect, an anchor includes a tubular body that is formed at least in part of cementitious material and has open and closed ends. The anchor also includes a pad eye coupled to the tubular body and configured to couple to a mooring line. The tubular body includes a base wall, a perimeter wall, and a shear key. The base wall defines the closed end of the tubular body and has first and second surfaces on opposite sides of the base wall. The perimeter wall extends from the first surface of the base wall to the open end of the tubular body, and the shear key extends from the second surface of the base wall. The shear key is configured to penetrate an underwater floor and resist a lateral displacement of the anchor along the underwater floor when penetrated therein.