标准编号：ISO 21052:2021
中文名称：球墨铸铁管道的约束连接系统 约束长度的计算规则
英文名称：Restrained joint systems for ductile iron pipelines — Calculation rules for lengths to be restrained
发布日期：2021-11
标准范围
This document specifies a computation method used to determine the length of the ductile iron pipes to be restrained, when used for conveying raw water, drinking water, sewerage under pressure.
This computation method takes into account all common pipeline route changes, including changes in the diameter of the pipeline itself and dead ends at the extremity of the pipeline, the outside diameter of the pipe, the system test pressure (to estimate the thrust), depth of cover, the characteristics of the soil surrounding the pipe and trench backfilling methods for a worldwide usage. The characteristics of the restrained joint are not covered by this document but can also be considered to determine the restraining length using any appropriate method.
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