For new submarine pipeline maintenance lifting equipment, a specialized analysis model is constructed in this study. A pipeline can be divided into the lifted portion and the touch-down portion that lies on the seabed, and each of these portions can be analyzed separately by converting the continuity conditions at the touch-down points to boundary conditions. The typical two-point sequence secant iterative technique is used to obtain the unknown lifted length and determine pipeline lifting configurations. The BVP4C module in MATLAB software is used to solve this multiple-point boundary value problem issued from first-order differential equations. Also, the triple-point lifting mode of truncated maintenance and the two-point lifting mode of online maintenance are discussed. When the lifted heights at truss positions are shown, the lifting deformation, lifting forces, bending moment distribution, and axial force distribution can be analyzed using a dedicated analysis program. Numerical results can then be used to design a lifting strategy to protect the pipeline.

对于新的海底管道维修起重设备，本研究构建了专门的分析模型。可以将管道分为位于海床上的提升部分和降落部分，并且可以通过将降落点的连续性条件转换为边界条件来分别分析这些部分中的每一个。典型的两点序列割线迭代技术用于获得未知的提升长度并确定管道提升配置。MATLAB软件中的BVP4C模块用于解决由一阶微分方程发出的多点边界值问题。此外，还讨论了截断维护的三点提升模式和在线维护的两点提升模式。显示桁架位置的高度时，可以使用专用的分析程序分析提升变形，提升力，弯矩分布和轴向力分布。然后，可将数值结果用于设计提升策略以保护管道。