Lifting vessel and lifting operation method

Abstract

The invention relates to a crane ship and a hoisting operation method, and belongs to the technical field of ships. The crane ship comprises a semi-submersible main ship body and a plurality of cargobooms detachably mounted on the main ship body, a ballast tank is arranged in the main ship body, and a telescopic full-revolving propeller is mounted at the bottom of the bow of the main ship body. Afull-revolving propeller is mounted at the bottom of the stern of the main ship body, each hoisting arm comprises a hoisting beam and a bearing piece arranged at the end part of the hoisting beam, and the hoisting beam can transversely move along the main ship body. The end part of the hoisting beam transversely extends out of the main ship body during hoisting operation, and the bearing piece can vertically rise and fall relative to the hoisting beam through hydraulic drive. The crane ship can be dynamically positioned in an operation area, the bearing piece extends out to an operation position through the transverse extending of the hoisting beam, and the bearing piece is hydraulically driven to vertically rise and fall to be matched with the ballast adjustment, so that the hoisting operation can be quickly completed. The crane ship can work separately and can also work together with other crane ships. The operation method is flexible and high in operation efficiency.

Description

Technical field [0001] The present invention relates to the technical field of ships, in particular to a lifting ship and a lifting operation method. Background technique [0002] Very large offshore oil and gas field equipment generally includes an upper module and a supporting structure placed under the upper module. The installation of the upper module mostly adopts the float method. For different projects and different environments, the upper module is usually designed with different volumes during design and production, so the upper module does not have a unified volume standard. In the design of offshore oil and gas field equipment, many of them did not consider the issue of decommissioning. Or, limited to the offshore lifting capacity at that time, large upper modules were generally hoisted, connected and debugged in blocks, and did not have the conditions for overall hoisting. However, when offshore facilities need to be dismantled when they are decommissioned, it is di...

AI Technical Summary

Problems solved by technology

The operation process of lifting the upper block is carried out in the way of unloading and drainage. The operation process takes a long time, is greatly affected by the waves, and the operation window is short

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