Тип публикации: статья из журнала
Год издания: 2018
Ключевые слова: Axial expansion joints., Heat networks, Pre-stressed heat supply pipeline, Temperature expansion of pipelines, Trenchless heat supply pipeline, Heat networks, trenchless heat supply pipeline, temperature expansion of pipelines, pre-stressed heat supply pipeline, axial expansion
Аннотация: Relevance. The important research field in heat supply is design of underground trenchless heat supply networks which can significantly reduce capital expenditures compared to above-ground or fully trenched networks. Using the optimal number of expansion joints allows designing extended rectilinear sections of underground trenchless heat supply pipelines. Currently, design and construction of thermally pre-stressed trenchless pipelines of heating networks raises acute questions in specialists. There is not much up-to-date information in this topic. Trenchless laying requires more strict approach to solutions for compensation of temperature expansions. Thus, the refined methods for analysis of thermal expansion compensation in pipes and utilization of trenchless laying of heating network sections can save dozens of millions of rubles. The aim of the research is to develop a technique for analyzing compensation of temperature expansions in underground trenchless thermally pre-stressed steel pipelines of water heating networks with expansion joints. Methods: mathematical modeling of the stress-strain state of a section of a trenchless heat supply pipeline with expansion joints; numerical solution of the test problem for the section of the heat supply pipeline with known parameters using the developed technique. Results. This paper introduces a technique for analysis of underground trenchless thermally pre-stressed pipelines of heating networks with expansion joints compensating temperature expansions. This technique allows using the optimum number of expansion joints on extended sections of heat supply pipelines due to the maximum use of the strength reserve. The research gave characteristic curves of the stress value depending on length of the section and the number of the expansion joints installed on it. The construction of such curves using the proposed method allows obtaining a complete picture of the stress-strain state for sections of heat supply pipelines with expansion joints. © Tomsk Polytechnic University, Publishing House. All rights reserved.
Журнал: Bulletin of the Tomsk Polytechnic University, Geo Assets Engineering
Выпуск журнала: Vol. 329, Is. 7
Номера страниц: 57-69
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