1.1 本规范涵盖了拟使用顶升技术安装的预制钢筋混凝土整体箱形截面的制造要求。这类产品的典型用途是修建涵洞和输送雨水、工业废物和污水。 1.2 本规范的要求旨在补充预制钢筋混凝土箱形截面的现有制造标准，并提供将使用顶升技术安装的箱形截面所需的额外制造细节。 预制钢筋混凝土箱形截面的母制造标准在本文件中表示为“指定的预制钢筋混凝土箱式截面制造标准”。当箱形截面用于顶升时，其中包含的要求应补充和取代指定的预制钢筋混凝土箱形截面制造标准。 注1: 本规范是使用顶升技术安装的预制钢筋混凝土箱形截面的制造和采购规范，将与指定的预制钢筋砼箱形截面制造标准一起使用。 这种箱形截面可能需要特殊设计来承受预期的纵向载荷。除了非顶升安装的箱形截面所需的额外计算和信息外，还需要确定最大顶升力。用于计算容许顶推力，ASCE 28可以被引用。 注2: 当使用非开挖方法安装预制钢筋混凝土箱形截面时，本标准可用于补充现有标准。此类“指定预制钢筋混凝土箱形截面制造标准”包括但不限于ASTM C1433 ，ASTM C1577 和AASHTO M259。 1.3 单位-- 以英寸磅为单位的数值应视为标准。本标准不包括其他计量单位。 1.4 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。 1.5 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 specification covers the manufacturing requirements for precast reinforced concrete monolithic box sections that are intended to be installed using jacking techniques. The typical use of this type of product is for the construction of culverts and for the conveyance of storm water, industrial wastes and sewage. 1.2 The requirements of this specification are intended to supplement the existing manufacturing standards for precast reinforced concrete box sections and provide the additional manufacturing details required for box sections that will be installed using jacking techniques. The parent manufacturing standard for the precast reinforced concrete box sections is denoted as the “designated precast reinforced concrete box section manufacturing standard” throughout this document. The requirements included within shall supplement and supersede the designated precast reinforced concrete box section manufacturing standard when the box sections are to be used for jacking. Note 1: This specification is a manufacturing and purchase specification for precast reinforced concrete box sections installed using jacking techniques, to be utilized in conjunction with the designated precast reinforced concrete box section manufacturing standard. It is possible that such box sections will require a special design to withstand the anticipated longitudinal loading. Additional calculations and information beyond what are required for a non-jacked installed box section are required to establish maximum jacking forces. For calculating allowable jacking forces, ASCE 28 may be referenced. Note 2: This standard may be used to supplement existing standards for precast reinforced concrete box sections when the box sections will be installed using trenchless methods. Such “designated precast reinforced concrete box section manufacturing standards” include, but are not limited, to ASTM C1433 , ASTM C1577 , and AASHTO M259. 1.3 Units— The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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.