1.1 本规程涵盖了与地下应用中使用的高密度聚乙烯（HDPE）制成的检修孔和部件的设计相关的一般和基本程序，适用于人员通道结构。该实践涵盖了人孔筒（也称为垂直立管或竖井）、地板（底部）和顶部以及竖井段之间接缝的材料、结构设计要求。 1.2 本规程为HDPE人孔的正确设计提供了最低要求。由于人孔高度、直径和土壤的可变性，每个人孔都必须单独设计和详细说明。如果使用和实施得当，这种做法可以帮助确保行业的安全可靠结构。 1.3 免责声明-- 读者应注意，在应用本实践中提出的数据或建议时，必须进行独立的专业判断。本文所含材料的发布并不意味着ASTM表示或保证这些信息适用于一般或特定用途，也不意味着不会侵犯任何专利。任何使用此信息的人都承担由此产生的所有责任。结构的设计在持证建筑师、结构工程师或其他持证专业人员的专业知识范围内，适用于特定结构的原理。 1.4 以英寸为单位的值- 磅单位将被视为标准。括号中给出的国际单位制仅供参考。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。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。 =====意义和用途====== 4.1 用途-- 本规程的要求旨在提供适用于安装在管道或导管沟、垃圾填埋场周边和沉降特性有限的垃圾填埋场的检修孔。直接安装在卫生填埋场或其他土壤沉降较大（超过10%）的填料中可能需要在本规范范围之外进行特殊设计。 4.1.1 假设人孔仅受重力流的影响。 4.2 设计假设-- 本规程中的设计方法仅适用于安装在由规程中定义的I类、II类或III类材料组成的回填料中的检修孔 D2321 ，其已被压实至最低90%的标准普氏密度。 这些设计基于从检修孔周边延伸至少3.5英尺（1米）至检修孔全高的回填土，并横向延伸至未受干扰的原位土壤。人孔假定放置在由至少12英寸（30.5厘米）的I类材料压实至至少95%的标准普氏密度或混凝土板组成的稳定基础上。基底下的地基土必须提供足够的承载强度，以承受下拉荷载。 4.2.1 安装在卫生填埋场或其他经历大规模沉降的填料中的人孔可能需要超出本实践范围的特殊设计。设计者应评估每个特定地点，以确定HDPE人孔的适用性，设计者应准备一份书面安装规范，这超出了本规范的范围。

1.1 This practice covers general and basic procedures related to the design of manholes and components manufactured from high-density polyethylene (HDPE) for use in subsurface applications and applies to personnel access structures. The practice covers the material, the structural design requirements of the manhole barrel (also called vertical riser or shaft), floor (bottom), and top, and joints between shaft sections. 1.2 This practice offers the minimum requirements for the proper design of an HDPE manhole. Due to the variability in manhole height, diameter, and the soil, each manhole must be designed and detailed individually. When properly used and implemented, this practice can help ensure a safe and reliable structure for the industry. 1.3 Disclaimer— The reader is cautioned that independent professional judgment must be exercised when data or recommendations set forth in this practice are applied. The publication of the material contained herein is not intended as a representation or warranty on the part of ASTM that this information is suitable for general or particular use, or freedom from infringement of any patent or patents. Anyone making use of this information assumes all liability arising from such use. The design of structures is within the scope of expertise of a licensed architect, structural engineer, or other licensed professional for the application of principles to a particular structure. 1.4 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are provided for information only. 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. ====== Significance And Use ====== 4.1 Uses— The requirements of this practice are intended to provide manholes suitable for installation in pipeline or conduit trenches, landfill perimeters, and landfills with limited settlement characteristics. Direct installation in sanitary landfills or other fills subject to large (in excess of 10 %) soil settlements may require special designs outside the scope of this practice. 4.1.1 Manholes are assumed to be subject to gravity flow only. 4.2 Design Assumption— The design methodology in this practice applies only to manholes that are installed in backfill consisting of Class I, Class II, or Class III material as defined in Practice D2321 , which has been compacted to a minimum of 90 % standard proctor density. The designs are based on the backfill extending at least 3.5 ft (1 m) from the perimeter of the manhole for the full height of the manhole and extending laterally to undisturbed in situ soil. Manholes are assumed placed on a stable base consisting of at least 12 in. (30.5 cm) of Class I material compacted to at least 95 % standard proctor density or a concrete slab. The foundation soils under the base must provide adequate bearing strength to carry downdrag loads. 4.2.1 Manholes installed in sanitary landfills or other fills experiencing large settlements may require special designs beyond the scope of this practice. The designer should evaluate each specific site to determine the suitability for use of HDPE manholes and the designer should prepare a written specification for installation, which is beyond the scope of this practice.