1.1 本规范涵盖了公用设施、水和废水结构的基本水平的装配式金属检修口的设计、测试、制造、选择和安装，包括公用设施拱顶、排水结构、阀门拱顶、仪表拱顶、湿井、泵外壳、公用设施沟渠、管道沟渠和排水沟。 1.2 本说明书适用于由各种材料和等级的金属制成的入口舱口的各种配置，用于各种装载条件、交通速度或两者。 1.3 提供了工程设计和测试标准，用于位于经受各种负载条件、交通速度、频率或其组合的各种区域中的入口舱口。 1.4 提供了验证载荷标准，以允许通过工程计算和/或极限强度载荷测试来设计检修舱口。1.5 提供生产装载标准以允许对检修舱口进行测试，以验证制造舱口的装载能力。 1.6 包括舱口载荷选择指南，以允许根据实际放置区域的条件选择适当的舱口设计载荷。 1.7 以英寸磅或SI单位表示的值应单独视为标准值。SI单位显示在括号中。每个系统中陈述的值可能不完全等同；因此，每个系统应独立使用。合并两个系统的值可能导致不符合标准。 1.8 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。1.9 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》中确立的国际公认的标准化原则制定的。

1.1 This specification covers the design, testing, manufacture, selection, and installation of substantially horizontal fabricated metal access hatches for utility, water, and wastewater structures including utility vaults, drainage structures, valve vaults, meter vaults, wet wells, pump enclosures, utility trenches, piping trenches, and drainage trenches. 1.2 This specification is applicable to various configurations of access hatches constructed of fabricated metal of various materials and grades for various loading conditions, traffic speeds, or both. 1.3 Engineering design and testing criteria are provided for access hatches to be located in various areas subjected to various loading conditions, traffic speed, frequency, or combinations thereof. 1.4 Proof loading criteria is provided to allow the access hatches to be designed by engineering calculation and/or by ultimate strength load testing. 1.5 Production loading criteria is provided to allow the access hatches to be tested to verify the load capacity of the manufactured hatches. 1.6 Hatch loading selection guidelines are included to allow selection of the proper hatch design loading for the conditions of the actual area of placement. 1.7 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. 1.8 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. 1.9 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.