Submarine pipeline bending arrestor with stability support and fixing method thereof

Abstract

The invention belongs to the technical field of submarine pipeline facility paving, in particular to a submarine pipeline bending arrestor with a stability support. The submarine pipeline bending arrestor with a stability support is fixed between two segments of a submarine pipeline when in use and comprises a stability support and a spherical bending arrestor fixed inside the stability support, wherein the bending arrestor is axiolitic and has a toroidal cross section, the internal diameter of the bending arrestor is identical to the internal diameter of the pipeline, the external diameter of the cross section axially changes and is gradually reduced from the middle to both ends; the external diameters of the cross sections of both ends of the bending arrestor are identical to the external diameter of the pipeline, the stability support comprises a shell with two petals in identical cross sections, i.e. one semi-toroidal upper shell and one semi-toroidal lower shell with a smoothed bottom and a groove in the bottom middle; the edges of the two petals of the shell are provided with outwards extending eye plates, and bolts penetrate through the eye plates to connect the two petals of shell together and tightly stick the shell to the outer surfaces of the pipeline and the spherical bending arrestor. The invention also provides a fixing method of the bending arrestor. By means ofthe invention, the stress concentration of the submarine pipeline bending arrestor can be effectively prevented and the on-site stability of the submarine pipeline can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of laying submarine pipeline facilities, and in particular relates to an accessory component of a submarine pipeline. Background technique [0002] 1. Buckling Propagation and Buckling Arresters for Submarine Pipelines [0003] Under the action of external hydrostatic pressure and bending, subsea pipelines are prone to buckling failure. There are two forms of buckling failure: one is local buckling (Collapse), and the other is buckling propagation (Propagating Buckles). Theoretically, buckling propagation will not occur if the control pipeline does not locally buckle; however, even if the pipeline is selected and laid strictly according to the design requirements, there will still be some situations in the actual laying process that will cause the pipeline to be affected. The force is greater than expected, causing localized buckling. For example, the submarine pipeline may be subjected to external forces...

AI Technical Summary

Problems solved by technology

The increase of the underwater weight of the pipeline is generally achieved by increasing the thickness of the pipeline concrete counterweight layer. However, the excessive design weight of the pipeline will put forward higher requirements for the pipe laying facilities and methods; and if the pipeline is buried or covered, then Huge construction costs are required

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