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Upheaval buckling Solution for submarine pipelines by segmented ditching and hot water flushing

机译：海底管道分段开沟和热水冲洗的剧变屈曲解决方案

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An upheaval buckling solution is proposed using a preheating method combined with constraints from two segmented ditching constructions, which are scheduled before and after preheating. In this solution, some selected pipe segments along the route were curve-laid and preserved resting on the seabed in the first ditching construction, while other straight segments were trenched. The subsequent hot water flushing operation induced the curve-laid segments to buckle on the seabed, and then these prebuckles were laterally constrained by the second ditching operation carried out during preheating. After preheating, the cooling rebound of these prebuckles was constrained by the new trenches, and axial pretension was induced in the pipe wall to offset the axial compression in service and upgrade the thermal stability of the entire pipeline. A detailed design approach is provided in this paper, and corresponding Finite Element Model (FEM) verification is given for an example pipeline. (C) 2015 Elsevier Ltd. All rights reserved.
机译：提出了一种预热方法，结合预热前后安排的两个分段沟结构的约束，提出了一种预热屈曲解决方案。在该解决方案中，沿路线选择的某些管段在第一个开沟施工中被曲线铺设并保留在海床上，而其他直管段则被开槽了。随后的热水冲洗操作导致弯曲的分段在海床上弯曲，然后这些预扣在预热期间进行的第二次开沟操作中受到侧向约束。预热后，这些预扣板的冷却回弹受到新沟槽的约束，并且在管壁中引起轴向预应力，以抵消使用中的轴向压缩并提高整个管道的热稳定性。本文提供了一种详细的设计方法，并针对示例管道给出了相应的有限元模型（FEM）验证。 （C）2015 Elsevier Ltd.保留所有权利。

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