Research on mechanical model for aligning dislocated underwater pipelines during replacement and repair

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN Applied Ocean Research Pub Date : 2024-10-09 DOI:10.1016/j.apor.2024.104258
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Abstract

Submarine pipelines are laid with elastic bending to adapt to the changes in seabed elevation, which usually results in the pipeline being in a pre-stressed state. When replacing and repairing those damaged pipelines, it is easy to encounter rebound and misalignment after pipeline cutting. Therefore, the alignment of the dislocated pipelines must be carried out before replacing and connecting the pipes. At present, some internationally advanced underwater rapid repair equipment only has the function of pipeline lifting, and cannot achieve precise alignment of dislocated pipelines on both sides. It lacks the alignment control model. This article focuses on the alignment problem of dislocated underwater pipelines during replacement and repair. Firstly, based on the Winkler elastic foundation beam and cantilever beam theory, a mechanical model for the alignment of dislocated pipelines is established. Then, an alignment control method is developed based on the mechanical model, and recommended the model's applicability conditions, design parameters, and safe usage range. Finally, the accuracy and reliability of both the alignment mechanics model and control method have been fully verified through numerical method. The established mechanical model and control method in this paper address the crucial issue of aligning misaligned underwater pipelines during repair, providing technical support for engineering applications. And they can be used to guide the design of aligning functional structure for underwater rapid maintenance equipment and also be applied in development of specific alignment schemes for pipeline misalignment scenarios.
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研究在更换和维修过程中对准错位水下管道的机械模型
海底管道的铺设是通过弹性弯曲来适应海床标高的变化,这通常会导致管道处于预应力状态。在更换和修复这些受损管道时,很容易遇到管道切割后反弹和错位的情况。因此,在更换和连接管道之前,必须对错位的管道进行对位。目前,一些国际先进的水下快速修复设备仅具有管道吊装功能,无法实现两侧错位管道的精确对中。它缺乏对位控制模型。本文主要研究水下错位管道在更换和修复过程中的对中问题。首先,基于温克勒弹性基础梁和悬臂梁理论,建立了错位管道对中的力学模型。然后,基于力学模型建立了对中控制方法,并推荐了模型的适用条件、设计参数和安全使用范围。最后,通过数值方法充分验证了对中力学模型和控制方法的准确性和可靠性。本文建立的力学模型和控制方法解决了水下管道修复过程中错位对中的关键问题,为工程应用提供了技术支持。本文建立的力学模型和控制方法解决了维修过程中水下管道错位的关键问题,为工程应用提供了技术支持,可用于指导水下快速维修设备的对中功能结构设计,也可应用于管道错位情况下特定对中方案的开发。
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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