GB/T 46322-2025 Restrained joint systems for ductile iron pipelines—Calculation rules for lengths to be restrained

Scope

This document specifies the design method of the self-anchored length of ductile iron pipes using the self-anchored joint system to balance the hydraulic thrust when transporting different types of media for different purposes under pressurized conditions, including general provisions, the role of the pipeline, calculation of the self-anchored length, engineering design, and installation and laying requirements. The calculation method given in this document takes into account common pipeline path changes, including diameter changes and blind ends at the end of the pipeline, the outer diameter of the pipeline, the system test pressure (used to estimate the thrust), the depth of soil cover, the characteristics of the soil around the pipeline, and the backfilling method of the pipeline trench. The method in this document does not include requirements for the performance of the self-anchored joint. When calculating the self-anchored length, this factor can be appropriately considered. The method in this document is applicable to various types of self-anchored joint systems that comply with GB/T 13295, GB/T 26081, or GB/T 43492. The method in this document is not applicable to self-anchored joint systems that use anti-slip and anti-separation sealing rings that comply with HG/T 6183—2023. Note: GB/T 36173 provides specific design rules for self-anchored joints of pipes under various working pressures.

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