全世界建筑业的趋势是机械化和自动化。这一趋势导致了机械化隧道的持续快速发展。与传统隧道施工方法相比，其优势包括但不限于职业健康和安全、更快的进度以及减少施工劳动力需求。使用隧道掘进机在软土地基上进行机械化掘进通常与安装预制混凝土节段衬砌有关。然而，实践和代码组织提供的全行业指导很少。 本文件提供了预制混凝土隧道管片的指南，包括最新的发展和实践经验，以及设计和施工的所有方面的信息。这些指南基于在美国众多预制隧道项目中获得的知识和经验，以及经常用作行业参考的可用国家和国际指南。

The worldwide trend in construction is toward mechanization and automation. This trend has led to continued rapid progress of mechanized tunneling. Advantages over conventional tunnel construction methods include, but are not limited to, occupational health and safety, faster advance rates, and reducing construction labor requirements. Mechanized tunneling in soft ground using tunnel boring machines is often associated with installing precast concrete segmental lining. However, very little industry-wide guidance has been provided by practice and code organizations. This document provides guidelines for precast concrete tunnel segments, including the most recent developments and practical experience, in addition to information on all aspects of design and construction. These guidelines are based on the knowledge and the experience gained on numerous precast tunnel projects in the United States, and available national and international guidelines often used as industry references.