Bending of underwater pipeline during lifting

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The article considers the bending of a long concrete pipeline when its section is raised to the free surface of a reservoir. The initial horizontal position of the pipeline is rectilinear. Its static bending occurs under the action of concentrated forces, the weights of the pipe and the transported medium, and the lifting force of water. The minimum required value of the lifting force and the corresponding length of the raised section of a long pipeline are determined. Taking into account the large ratio of this length to the depth of the reservoir, a linear bending equation is used. An analysis of the bend is given depending on the controlled lifting force and the controlled rise of the pipeline.

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Sobre autores

M. Ilgamov

A.A. Blagonravov Institute of Mechanical Engineering of the RAS; Institute of Mechanics and Mechanical Engineering of the Kazan Scientific Center of the RAS; Mavlyutov Institute of Mechanics of the Ufa Federal Research Center of the RAS

Autor responsável pela correspondência
Email: ilgamov@anrb.ru
Rússia, Moscow; Kazan; Ufa

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2. Fig. 1. Scheme of lifting a long pipeline by concentrated forces.

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3. Fig. 2. Dependence of the length of the lifted section L (m) of a long pipeline on the concentrated forces P1 (МН) for different ratios α between them and distances l (m). In (3.6) it is assumed that q = 500 kg/s2.

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4. Fig. 3. Dependence of the lifting height W1 (m) of a point x = 0 on the lifting forces P1 (МН) and P2 = αP1 for different ratios α between them and distances l (m). In (4.3) it is assumed that D = 2 × 10 kg ⋅ m2/s2.

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