Stern structure of semi-submersible crane pipe-laying vessel

Abstract

A stern structure of a semi-submersible lifting pipe-laying ship, comprising: an upper platform, several columns fixed on both sides of the upper platform and arranged in parallel on both sides, and several lower floating bodies fixed below the several columns arranged in parallel on both sides, The crane cylinder is fixed at the tail of the upper platform, and the feature is that: the profile line of the horizontal bottom of the upper platform tail is lifted up to a set height, so that the profile line of the tail horizontal bottom and the horizontal bottom of the upper platform present a set angle. The invention can increase the tail air gap from the external shape, improve the wind and wave resistance of the platform, simplify the production process, and reduce the weight of the tail structure; thus, in terms of the weight distribution of the hull, the possibility of tail tilting is reduced, effectively The torsional load of the hull and the stress level at the connection between the platform and the column are controlled, the overall strength of the hull is greatly improved, and the fatigue life of important structural nodes is effectively improved.

Description

technical field [0001] The invention relates to a semi-submersible lifting pipe-laying ship, in particular to a tail structure of the semi-submersible lifting pipe-laying ship used for offshore oil and gas development and large-scale offshore engineering construction. It belongs to the field of marine engineering technology. Background technique [0002] The semi-submersible pipe-laying vessel (SSCV) has become a super-large crane and a vessel due to its advantages such as strong wind and wave resistance, large deck area, large deck variable load, large loading capacity, wide range of adaptability to water depth, and many living quarters for personnel. The best carrier for deepwater pipelay systems. The ultra-large full-slewing crane is installed at the tail of the upper platform (UPPER HULL, also known as the upper hull), and generally there are two sets, which can be used for simultaneous lifting operations. [0003] The semi-submersible platform mainly includes: an uppe...

AI Technical Summary

Problems solved by technology

When the cranes located at the stern are hoisting (especially double-crane joint hoisting), the hull forms a large stern inclination, resulting in a tight air gap at the stern, which limits the operating sea conditions of the semi-submersible crane pipe-laying vessel

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