UDC 628.2:621.644.073
DOI 10.35776/VST.2024.12.09

Zakharov Iu. S.

Determining the wall thickness of flexible polymer liners for the rehabilitation of pipelines of the state class II

Summary

Once gravity sewer pipelines are put into operation, longitudinal cracks may appear in the pipes after a relatively short period of time caused by the low quality of pipe products and violation of the construction technology. Pipelines with longitudinal cracks (state class II or III) can be rehabilitated using flexible polymer liner, provided that the «pipeline – soil» system is statically stable. A method for estimating the static stability of the «pipeline – soil» system is given. Taking into account the properties of the soil, backfilling and ovalization of the pipeline, the main loads acting on a new polymer pipe during the rehabilitation of pipelines with longitudinal cracks (condition class II) are determined. An algorithm is proposed for calculating the wall thickness of a flexible polymer liner for the rehabilitation of pipelines of the above-mentioned state class depending on the actual loads. As an alternative to using foreign specialized software, a method is proposed for calculating the wall thickness of a flexible polymer liner that provides for using tables and graphs to determine the wall thickness of the liner for the rehabilitation of state class II pipeline on exposure to the soil pressure, groundwater and transport loads.

Key words

pipeline , water disposal system , rehabilitation , flexible polymer liner , static calculation

For citation: Zakharov Iu. S. Determining the wall thickness of flexible polymer liners for the rehabilitation of pipelines of the state class II. Vodosnabzhenie i Sanitarnaia Tekhnika, 2024, no. 12, pp. 58–64. DOI: 10.35776/VST.2024.12.09. (In Russian).

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