ENSURING STRUCTURAL STRENGTH OF AN ABOVE-GROUND MAIN PIPELINE CROSSING DURING MAJOR REPAIR
DOI:
https://doi.org/10.31471/1993-9868-2026-2(46)-97-107Keywords:
stress-strain state; bending stresses; welded joints; soil foundation stiffness; vertical support adjust-ment.Abstract
The article addresses the issue of ensuring the structural strength of aboveground crossings of main oil pipelines during major repairs involving the replacement of damaged pipeline sections and the restoration of their operational reliability. Particular attention is paid to investigating the stress-strain state of the pipeline, the influence of the structural characteristics of the aboveground crossing, the flexibility of intermediate supports, and the properties of the soil foundation surrounding adjacent underground pipeline sections. The study employs a mathematical model representing the pipeline as a beam with variable flexural rigidity, which enables the deter-mination of bending moment, shear force, and stress distributions under different loading conditions and vertical positions of the supports. The formation of zones of increased bending stresses and their influence on selecting the locations of circumferential welded joints during repair operations are analyzed. The possibility of adjusting the vertical position of the pipeline to reduce bending moments at the locations where damaged sections are cut out and replacement pipe sections are welded in is examined. The influence of soil foundation stiffness on the required vertical adjustment displacements and the conditions for performing assembly and welding operations is investi-gated. It was established that for the studied two-support crossing the maximum bending stresses occur above the intermediate supports (up to 33.2 MPa), and the zones of elevated stresses extend up to 1.5 m from the supports. It was shown that ensuring zero bending moment at the location where the replacement pipe section is welded in requires lowering the pipeline above the support by 11.5–12 mm at a soil stiffness coefficient of 10 MPa/m and by up to 14.5 mm when it decreases to 5 MPa/m. The proposed approach aims to provide a scientific basis for selec-ting appropriate technological parameters for major pipeline repairs, reducing additional installation-induced stresses, and ensuring the reliable operation of repaired aboveground crossings of main pipelines
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