摘要:
A lifting block and a method of using it for supporting a load from a first lifting device or sharing the load between the first lifting device and a second lifting device, particularly for use on a vessel and deep water applications, are disclosed. The lifting block, with at least one sheave, has first and second connection elements associated with it. In one arrangement (single fall) a lifting wire or rope is fed around the sheave and terminated in an end stop which also provides the first connection element. When the first lifting device is operated alone, the end stop rests on the block. When the second connection element, secured to the lifting wire or rope of a second lifting device, is joined to the first connection element the load is snared between the two lifting devices which can then be operated in unison to position the load at a required, deeper position.
摘要:
Hoisting crane (20), comprising a substantially hollow jib (24,-124; 324) having a longitudinal axis, and comprising one or more hoisting cable guides (47, 48, 49; 147; 347). The jib comprises at least one jib leg (29; 129; 329) extending between a jib connection member (26) and a jib hoisting end (27; 127; 327), wherein the at least one jib leg comprises one or more hybrid portions (160; 360) comprising two elongated hollow casings (170; 370) substantially parallel to each other and substantially parallel to the longitudinal axis of the jib, and wherein between the two casings a truss (171 371) is provided to rigidly connect the two castings.
摘要:
Installation vessels and methods for offshore wind turbine installation are disclosed. In one embodiment, a cantilever mast is used to transfer of wind turbine components from an installation vessel to an offshore installation site and guide the transfer to prevent undesired swinging movements of the wind turbine components. In another embodiment, a main crane is used in cooperation with a guide arm to transfer and guide wind turbine components from an installation vessel to an offshore installation site.
摘要:
The disclosure provides a vessel with a double pontoon arrangement joined together with a central bridge creating an offset “H” arrangement. The bridge spans the pontoons and includes a gantry structure on top of which sits a lifting system. Articulated tugs provide accommodation, propulsion, and power to the main part of the installation vessel. Additional lifting devices can be installed within the gantry to provide further lifting capability. At least two stabilizing legs are provided along each pontoon. Once set up onsite, the stabilizing legs can be deployed to the seabed to lift the installation vessel up a short distance to apply load stability during lifting operations. Seabed piles, mast elements, and turbine elements are delivered by barges that are temporarily moored between the pontoons for offloading and installation. Empty barges are relocated, and successive barges bring remaining elements for offloading and installation to complete the wind turbine installation.
摘要:
A crane including an inner boom, an outer boom, a plurality of guide assemblies arranged along the length of the inner and outer boom and adapted for guiding a plurality of lines, and a multi-line material handling system including a first line having an outgoing portion extending to a sheave block, and an incoming portion returning from the sheave block to a supported anchor device, and a second line having an outgoing portion extending to the sheave block, and an incoming portion returning from the sheave block to the supported anchor device.
摘要:
The present invention relates to a crane control for a crane arranged on a ship, having a load moment limitation system which determines a maximum permitted payload, wherein the load moment limitation system is in communication with a measuring unit for measuring the movement of the ship and determines the maximum permitted payload on the basis of data of the measuring unit.
摘要:
The present invention is typically embodied to exert active control of two same-shipboard cranes performing joint lifting of a payload. Sensory signals indicative of ship motion, and of luff angle and hoist line length of both cranes, are transmitted to a computer. The sensory signals are processed by the computer using a ship motion cancellation algorithm, which solves for values of the respective luff angles and hoist line lengths of both cranes, such values achieving static equilibrium (e.g., zero motion horizontally, vertically, and rotationally in the same vertical geometric plane) of the suspended payload. Inverse kinematic control signals in accordance with the mathematical (e.g., minimum norm) solutions are transmitted by the computer to respective luff angle actuators and hoist line length actuators of both cranes so that the suspended payload tends toward steadiness. Inventive control thus acts on a continual basis to significantly reduce pendulation during the two-crane lifting operation.
摘要:
A cargo transfer system for transferring cargo between two decks which may be subject to relative movements between each other is disclosed. The cargo transfer system includes a transverse member movably coupled to an elevated portion of a first deck (or a tower member on the first deck), and a side member movably coupled to the transverse member. In a deployment position, the side member is releasably coupled with a receiving base on the second deck. The cargo transfer system is actuatable by a relative movement between the first deck and the second deck to self-adjust for accommodating or countering the relative movement.
摘要:
The invention relates to a method for erecting a wind turbine on an offshore site, said method comprises the steps of positioning a first boom of a crane in a substantially horizontal position, arranging a substantially horizontal positioned elongated wind turbine component on said first boom, connecting a distal part of said elongated wind turbine component to a second boom of said crane, said distal part is the upper part of the wind turbine component when the wind turbine is erected, and said second boom is extending at an angle from the longitudinal extension of said first boom, elevating said first boom to a substantially vertical position, modifying the position in the horizontal plane of said elongated wind turbine component, in order to reach a desired erecting position for the component, and disconnecting said distal part of said elongated wind turbine component from said second boom of said crane. The invention also relates to a vessel for erecting a wind turbine on an offshore site.
摘要:
Installation vessels and methods for offshore wind turbine installation are disclosed. In one embodiment, a cantilever mast is used to transfer of wind turbine components from an installation vessel to an offshore installation site and guide the transfer to prevent undesired swinging movements of the wind turbine components. In another embodiment, a main crane is used in cooperation with a guide arm to transfer and guide wind turbine components from an installation vessel to an offshore installation site.