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管理人员正在积极评估、修复和更换供水和下水道管道，以解决当前的基础设施更新周期，以便我们继续享受清洁水的好处我们的家庭、工业和企业，以及废水去除处理。预算限制重新强调避免与水管漏水和地下水进入下水道有关的不必要费用。已经开发了新技术来协助管道修复，例如现场固化的聚合物衬里，可以重新密封泄漏的管道，并以比“切割和覆盖”管道更换更低的初始成本恢复结构稳定性。然而，关键的知识差距为咨询工程师就具体项目提供建议带来了巨大的挑战，并显著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，-现有管道的稳定性不太清楚，因此维修或更换的决定通常是通过视觉或其他定性评估做出的;当更好的管道检查数据可用时，铸铁、混凝土和粘土管道的管道强度模型没有明确地考虑劣化。现场固化的聚合物衬里的长期失效机制、它们的耐久性和预期的使用寿命还没有建立，因此，顾问和公用事业经理不知道这些维修将持续多久-正在开发用于维修孔（MH）的喷涂衬里，但对衬里失效模式、粘合的重要性和喷涂衬里的耐久性知之甚少（没有合理的程序来选择衬里厚度，并且旧MH的表面清洁和粗糙化对粘合的影响是不确定的）-需要在新管道中消除过去的接头泄漏问题，通过识别控制泄漏的因素。使用独特的埋管和聚合物耐久性测试设施，摩尔，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.