1.1 本规程涵盖了根据规范制造的圆形埋入式预制混凝土低水头压力管的设计 C361/C361M 承受不超过125压头的内部压力 英尺（54 psi）、或如本文所限定的。 1.2 埋设时，混凝土管道是由管道和周围土壤包层组成的复合系统的一部分。管道和土壤包络都有助于系统的强度和结构性能。 1.3 本规程介绍了根据规范制造的埋入式预制混凝土低水头压力管的外部荷载和内部压力影响的评估方法 C361/C361M 该方法包括在确定外部荷载、土压力分布以及管道的力矩、推力和剪切力时，考虑管道和土壤包层之间相互作用的分析。它还包括为这些装置设计钢筋的详细程序。 1.4 预制混凝土低水头压力管的施工要求符合规范 C361/C361M . 1.5 本规程可供业主和业主工程师在编制低水头压力管道项目规范时参考。 1.6 本标准中给出的设计程序旨在供熟悉影响埋地混凝土管道装置结构性能的安装和管道特性以及安装要求重要性的工程师使用。 1.7 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This practice covers the design of buried precast concrete low head pressure pipe having a circular shape and manufactured in accordance with Specification C361/C361M subject to internal pressure not exceeding a pressure head of 125 ft (54 psi), or as otherwise limited herein. 1.2 When buried, concrete pipe is part of a composite system comprised of the pipe and the surrounding soil envelope. Both the pipe and soil envelope contribute to the strength and structural behavior of the system. 1.3 This practice presents the method for evaluating the effects of external loads combined with internal pressure on buried precast concrete low-head pressure pipe manufactured per Specification C361/C361M . This method includes an analysis that accounts for the interaction between the pipe and soil envelope in determining external loads, earth pressure distributions, and the moments, thrusts, and shears for the pipe. It also includes a detailed procedure for designing reinforcement for these installations. 1.4 Construction requirements for precast concrete low-head pressure pipe are in accordance with Specification C361/C361M . 1.5 This practice may be used as a reference by the owner and the owner's engineer in preparing project specifications for low head pressure pipe. 1.6 The design procedures given in this standard are intended for use by engineers who are familiar with the installation and pipe characteristics that affect the structural behavior of buried concrete pipe installations and the significance of the installation requirements. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.