20世纪90年代给公用事业行业带来了大量非开挖施工 包括水平定向钻井（HDD）、微隧道、， 管道破裂，以及各种管道修复技术。并非所有的所有者 我们已经接受了这些新技术。不愿在问题上妥协 许多业主对其管道的质量、可靠性和结构完整性进行了评估 一直在等待球墨铸铁管的解决方案。本文讨论了这一案例 业主成功利用传统“承插”作为 以及通过非开挖方法安装的“无钟”球墨铸铁管接头。包括5个参考文献、图表。

The 1990s brought to the utility industry a potpourri of trenchless construction methodologies that included horizontal directional drilling (HDD), microtunneling, pipe bursting, and a myriad of pipe rehabilitation techniques. Not all owners have embraced these new technologies. Reluctant to compromise on the quality, reliability, and structural integrity of their pipelines many owners have been waiting for a ductile iron pipe solution. This paper discusses case histories where owners have successfully utilized conventional "bell-spigot" as well as "bell-less" ductile iron pipe joints for installation by trenchless methods. Includes 5 references, figures.