爆管法在北美地区的应用现状

随着市政部门不断寻求节约成本的创新技术来解决地下基础设施问题，非开挖管线更换技术诸如爆管法成为可行的选择。爆管法是一种用相等或更大口径的新管更换现有地下供水给水、污水排水和燃气输送管线的施工方法。它是唯一一种完全沿旧管线线路铺设的施工方法。这使得安装新管线施工时无须征求额外通行权。爆管法兴起于20纪80年代，现在已遍布北美地区。本文通过对来自2007—2010年加拿大和美国的886个项目的调查问卷结果的总结，讨论了目前非开挖更管技术的趋势，分析了爆管法施工中的因素：包括设备的使用、采购与支付的形式、管线扩径的限制和施工的风险。

Current Trends of Pipe Bursting in North America

As municipalities seek innovative technologies that can provide cost savings in addressing their underground infrastructure needs, trenchless technology for pipe replacement such as pipe bursting, has become a viable option. Pipe bursting is a construction method used for replacing existing underground water, sewer, or gas infrastructure with a new line of equal or large diameter. It is the only construction option capable of replacing a pipeline along the same alignment. This provides the advantage of not having to secure additional right-of-way to facilitate installation of a new pipeline. Since its origins during the 1980s, the use of pipe bursting has grown significantly in North America. This paper provides discussion on current trends in trenchless pipe replacement including results captured from a survey questionnaire examining 886 projects from 2007 to 2010 in Canada and the United States. The results examined various factors including equipment utilized, procurement and payment structures, pipe upsizing limits, and construction risks in pipe bursting.