1.1 本规程涵盖了拟用于混凝土涵洞、雨水管和污水管道系统施工的材料、系统或结构的最低成本（生命周期）分析（LCA）程序。 注1: 如本规程所述，分析示例包括但不限于以下内容:( 1. )材料管道衬里和涂层、混凝土壁厚、水泥、添加剂等。；( 2. )系统圆管、箱形管段、多条管线、压力总管等。 ; 和( 3. )构筑物干湿井、泵站和提升站等。 1.2 生命周期评价方法包括与规划、工程、施工（投标价格）、维护、修复、更换相关的成本，以及拟议项目设计寿命结束时任何剩余价值的成本扣减。 1.3 对于每种材料、系统或结构，生命周期评价方法以现值恒定美元确定项目设计寿命内所有初始和未来成本的总和，并扣除任何残值。 1.4 生命周期评价方法中的主要因素包括项目设计寿命、使用寿命以及相关利率和通货膨胀率。 1.5 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。 ====意义和用途====== 3.1 生命周期评价方法的意义在于，它是一种综合技术，用于在项目设计寿命期间考虑所有相关货币价值，并提供材料、系统或结构总成本的衡量方法。 3.2 生命周期评价方法可以有效地应用于项目的施工前和投标阶段。在进行投标后，可以使用实际成本而不是估计成本。

1.1 This practice covers procedures for least cost (life cycle) analysis (LCA) of materials, systems, or structures proposed for use in the construction of concrete culvert, storm sewer, and sanitary sewer systems. Note 1: As intended in this practice, examples of analyses include, but are not limited to the following: ( 1 ) materials-pipe linings and coatings, concrete wall thicknesses, cements, additives, etc.; ( 2 ) systems-circular pipe, box sections, multiple lines, force mains, etc.; and ( 3 ) structures-wet and dry wells, pump and lift stations, etc. 1.2 The LCA method includes costs associated with planning, engineering, construction (bid price), maintenance, rehabilitation, replacement, and cost deductions for any residual value at the end of the proposed project design life. 1.3 For each material, system, or structure, the LCA method determines in present value constant dollars, the total of all initial and future costs over the project design life, and deducts any residual value. 1.4 Major factors in the LCA method include project design life, service life, and relevant interest and inflation rates. 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. ====== Significance And Use ====== 3.1 The significance of the LCA method is that it is a comprehensive technique for taking into account all relevant monetary values over the project design life and provides a measure of the total cost of the material, system, or structure. 3.2 The LCA method can be effectively applied in both the preconstruction and bid stages of projects. After bids are taken, real costs can be used instead of estimates.