Method for installing structure hoisted in double-rope mode

Abstract

The invention relates to a method for installing a structure hoisted in a double-rope mode. The method comprises the steps that S1, the structure is connected to a crane lifting hook of a main crane; S2, the main crane lowers the structure to a first water depth; S3, a traction device is connected with the crane lifting hook, and a horizontal traction force is provided for the crane lifting hook; and S4, the main crane continues to lower the structure to an installation water depth; and S5, the structure is installed at a target position. According to the method, the traction device provides the horizontal traction force for the crane lifting hook which causes the torsion of a lifting rope of the main crane, and applies an additional anti-torsion moment to the crane lifting hook, so that the double-rope twisting caused by the rotation of the crane lifting hook is prevented.

Description

technical field [0001] The invention relates to the field of marine engineering, and more specifically, relates to a method for installing structures hoisted in a double-rope mode. Background technique [0002] It is only in recent years that domestic oil and gas development has made breakthroughs in actual engineering projects in the deepwater field. In the previous shallow water oil and gas development projects, large structures in deep water could be hoisted by single-rope and double-rope mode of the crane. Among them, the lifting capacity of marine engineering marine cranes in double-rope mode is about twice that of single-rope mode. [0003] However, in the installation of deep-water structures, due to the influence of the crane hook and the weight of the crane wire rope, and considering the dynamic effects caused by environmental factors such as ship motion and waves, the actual effective lifting capacity of the structure will be greatly reduced. decrease. For this ...

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Problems solved by technology

[0003] However, in the installation of deep-water structures, due to the influence of the crane hook and the weight of the crane wire rope, and considering the dynamic effects caused by environmental factors such as ship motion and waves, the actual effective lifting capacity of the structure will be greatly reduced. decrease

For this reason, the single-rope hoisting mode of ordinary cranes in the installation of deep-water structures may not meet the engineering requirements, and the double-rope mode of cranes is required to improve and maximize the maximum hoisting capacity of ship cranes

[0004] However, under the installation conditions of deep-water structures, there is also an unavoidable technical problem in the double-rope mode of the crane, that is, in the double-rope mode of the crane at a certain water depth, there will be a dangerous phenomenon of twisting of the double ropes, which will directly cause damage to the wire rope of the crane or even A break occurred during the hoisting process, causing the crane hook and the structure to fall to the bottom of the sea

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