Pipe liner evaluations and connection studies (PipeLEACS)

多伦多、汉密尔顿、金斯顿和其他社区的公用事业经理正在积极评估、修复和更换供水和下水道管道，以解决当前基础设施更新周期的问题，因此我们将继续享受家庭、工业和商业使用清洁水的好处，并将废水清除处理。预算限制再次强调要避免因管道漏水造成的水损失和地下水进入下水道而造成的不必要成本。新技术已经被开发出来，以协助管道修复，如固化的聚合物衬垫，可以重新密封泄漏的管道，并恢复结构稳定性，比“切割和覆盖”管道更换的初始成本更低。然而，关键的知识差距给咨询工程师在具体项目上提供建议带来了巨大的挑战，并大大放大了城市工程师和其他负责公共安全的人所感知的“新技术”风险。**-现有管道的稳定性没有得到很好的了解，因此维修或更换的决定通常是通过视觉或其他定性评估来做出的；当更好的管道检测数据可用时，铸铁、混凝土和粘土管的管道强度模型没有明确考虑劣化**-固化聚合物衬垫的长期失效机制，其耐久性和预期使用寿命尚未建立，因此顾问和公用事业管理人员不知道这些修复将持续多长时间**-用于维护孔（MH）的喷涂衬垫正在开发中，但对衬垫失效模式知之甚少。粘合的重要性，以及喷涂衬管的耐久性（没有合理的程序来选择衬管厚度，旧MH的表面清洁和粗化对粘合的影响是不确定的）**-需要通过识别控制泄漏的因素来消除新管道中过去的接缝泄漏问题。**使用独特的地埋管和聚合物耐久性测试设备，Moore, Brachman， Hoult和8名博士生将进行开创性的实验工作和分析，以研究和解决这些挑战。项目成果可以纳入标准、实践指南和规范，供行业合作伙伴和其他人使用。

Utility managers in Toronto, Hamilton, Kingston and other communities are actively assessing, rehabilitating and replacing water & sewer pipelines to address the current infrastructure renewal cycle, so we continue to enjoy the benefits of clean water for our homes, industries and businesses, and wastewater removal for treatment. Budget limits are placing renewed emphasis on avoiding unnecessary costs associated with water loss from leaking pipes, and ingress of groundwater into sewers. New technologies have been developed to assist with pipeline rehabilitation, like cured in place polymer liners that can reseal leaking pipes and restore structural stability at lower initial cost than 'cut and cover' pipe replacement. However, key knowledge gaps create substantial challenges for consulting engineers advising on specific projects, and significantly magnify the 'new technology' risks perceived by city engineers and others charged with public safety, **- The stability of existing pipes is not well understood, so decisions to repair or replace are often made using visual or other qualitative assessments; when better pipe inspection data is available, pipe strength models for cast iron, concrete and clay pipes do not explicitly consider deterioration**- The long term failure mechanisms for cured in place polymer liners, their durability and expected service lives have not been established, so consultants & utility managers do not know how long these repairs will last**- Spray-on liners are being developed for maintenance holes (MH), but little is known about the liner failure modes, the importance of bond, and sprayed liner durability (no rational procedures are available to choose liner thickness, and the impact on bond of surface cleaning & roughening of the old MH is uncertain)**- Past joint leakage issues need to be eliminated in new pipes, by identifying factors controlling leakage.**Using unique buried pipe & polymer durability test facilities, Moore, Brachman, Hoult and 8 PhD students will undertake seminal experimental work & analyses to study & address these challenges. The project outcomes can be incorporated into standards, practice guidelines, & specifications for use by industry partners & others.