Gazpromneft Scientific and Technical Center, St. Petersburg, Russia

S. A. Yalygin, Director of Technological Development Programs “Capital Construction”

Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia
B. S. Ermakov, Dr. Eng., Head of the Materials Resources Laboratory, e-mail: ermakov_bs@spbstu.ru
O. V. Shvetsov, Cand. Eng., Deputy Head of Laboratory of Materials Resource

V. P. Larionov Institute of the Physical-Technical Problems of the North, Siberian Branch of the Russian Academy of Sciences, Yakutsk, Russia
N. I. Golikov, Dr. Eng., Chief Researcher, Welding and Metallurgy Technologies Department

Empress Catherine II St. Petersburg Mining University, St. Petersburg, Russia
S. A. Vologzhanina, Dr. Eng., Prof., Dept. of Materials Science and Technology of Art Products, e-mail: vologzhanina_sa@pers.spmi.ru

Abstract: The development of hydrocarbon production sites in permafrost zones and the need to reduce costs require a more thorough study of the requirements for the materials and structures used. An analysis of regulatory and technical documentation revealed that some of these requirements are unreasonably high. Thus, SP 16.13330.2020 specifies that when manufacturing bored precast foundation piles, it is necessary to ensure an impact toughness level of welded joints obtained by high-frequency welding of at least 34 J/cm² at a temperature of -60 °C. This requires extensive post-weld heat treatment of the pipes from which the piles are made, dramatically increasing the cost of the structure and leading to higher construction costs. It should be noted that GOST 20295, which is used to manufacture pipes for the piles, and similar regulatory and technical documents do not contain such requirements. An analysis of the mechanical properties and residual welding stresses in the pipes with and without heat treatment was conducted. Field tests of bored precast piles installed in the permafrost zone were also conducted. The conducted studies allow to conclude that the requirement for heat treatment of the pipes is excessive and should be eliminated.
This work was carried out as part of a state assignment from the Ministry of Science and Higher Education of the Russian Federation (Topic No. FSEG-2024-0009: Development of models for the degradation of the performance properties of metallic and composite materials for construction in permafrost soils).

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