1.1 本规范涵盖了用于装配和建造用于下水道、排水和供水工程的圆形垂直预制钢筋混凝土人孔和结构的产品的制造和采购要求。 1.2 第一部分，章节 1 – 11 本规范中，给出了本规范涵盖的每种预制混凝土产品的一般要求和通用要求。 1.3 本规范第二部分在以下章节中介绍了每个人孔产品的具体要求: 产品 部分 等级环 12 平板顶部 13 立管和锥形顶部 14 基础截面 15 台阶和梯子 16 注1: 未来的产品将包含在本规范未来版本的第二部分中。 1.4 以英寸-磅或国际单位表示的数值应单独视为标准值。国际单位如括号所示。每个系统中规定的值可能不完全相等；因此，每个系统应独立于其他系统使用。结合两个系统的值可能会导致不符合标准。 注2: 本规范仅为制造和采购规范，不包括回填要求，也不包括现场荷载条件与人孔产品和附件强度要求之间的关系。 然而，经验表明，该产品的成功性能取决于产品强度、基础和回填类型的正确选择，以及人孔产品和连接管的现场安装注意事项。此处规定了这些产品的项目业主应注意要求在施工现场进行检查。 1.5 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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。

1.1 This specification covers the manufacture and purchase requirements of products used for the assembly and construction of circular vertical precast reinforced concrete manholes and structures used in sewer, drainage, and water works. 1.2 Part I, Sections 1 – 11 , of this specification presents general requirements and requirements that are common to each precast concrete product covered by this specification. 1.3 Part II of this specification presents specific requirements for each manhole product in the following sections: Product Section Grade Rings 12 Flat Slab Tops 13 Risers and Conical Tops 14 Base Sections 15 Steps and Ladders 16 Note 1: Future products will be included in Part II in a future revision of this specification. 1.4 The values stated in either inch pound or SI units are to be regarded separately as standard. The SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Note 2: This specification is a manufacturing and purchase specification only and does not include requirements for backfill, or the relationship between field load conditions and the strength requirements of the manhole products and appurtenances. Experience has shown, however, that the successful performance of this product depends upon the proper selection of the product strength, type of foundation and backfill, and care in the field installation of the manhole products and connecting pipes. The owner of the project for which these products are specified herein is cautioned to require inspection at the construction site. 1.5 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. 1.6 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.