球墨铸铁管道的约束连接系统.约束长度的计算规则

[中文适用范围]： 本标准规定了用于带压输送原水、饮用水、污水的球墨铸铁管受约束长度的计算方法。 该计算方法考虑了所有常见的管道路线变化，包括管道本身直径和管道末端死角的变化、管道外径、系统测试压力（用于估计推力）、深度覆盖层、管道周围土壤的特性以及全球使用的沟渠回填方法。 本文件未涵盖约束接头的特性，但也可以考虑使用任何适当的方法来确定约束长度。 本文件定义的计算方法适用于所有类型的约束接头系统，其球墨铸铁管道的工作压力等级符合ISO 2531、ISO 7186和注1。 ISO 10804涉及接头在各种工作压力下的实际设计。 管道。 注 2：可以使用国家标准或既定的计算方法来代替本 ISO 标准。 [外文原描述]： 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. The computation method defined in this document is applicable to all types of restrained joint systems, with their operating pressure ratings of ductile iron pipelines complying with ISO 2531, ISO 7186 and ISO 16631. NOTE 1 ISO 10804 deals with actual design of the joint for various operating pressures of the pipeline. NOTE 2 National standards or established calculation methods can be used instead of this ISO standard.