1.1 本规范涵盖内径为100至900 mm的混凝土排水砖，用于表面和地下排水。 1.2 本规范是规范的公制对应项 C412型 . 注1: 本规范仅为制造和采购规范，不包括垫层、回填要求或现场荷载条件与排水砖强度分类之间的关系。然而，经验表明，产品的成功性能取决于正确选择排水砖等级、垫层和回填类型，并注意安装是否符合施工规范。业主应注意，他必须将现场要求与规定的排水砖等级相关联，并提供或要求在施工现场进行检查。 1.3 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 concrete drain tile with internal diameters from 100 to 900 mm, that are intended to be used for surface and subsurface drainage. 1.2 This specification is the metric counterpart of Specification C412 . Note 1: This specification is a manufacturing and purchase specification only and does not include requirements for bedding, backfill, or the relationship between field load condition and the strength classification of drain tile. However, experience has shown that the successful performance of the product depends upon the proper selection of the class of drain tile, type of bedding and backfill, and care that the installation conforms to the construction specifications. The owner is cautioned that he must correlate the field requirements with the class of drain tile specified and provide for or require inspection at the construction site. 1.3 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.