Pipe liner evaluations and connection studies (PipeLEACS)

多伦多、汉密尔顿、金斯敦和其他社区的公用事业经理正在积极评估、修复和更换给水和下水道管道，以应对当前的基础设施更新周期，因此我们继续享受家庭、工业和企业的清洁水以及用于处理的废水去除的好处。预算限制再次强调避免与泄漏管道的水损失和地下水进入下水道相关的不必要成本。已经开发了新的技术来帮助管道修复，如就地固化聚合物衬里，它可以重新密封泄漏的管道并恢复结构稳定性，而初始成本低于更换管道。然而，关键的知识差距给咨询工程师就具体项目提供建议带来了巨大的挑战，并极大地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做出的；当有更好的管道检验数据时，铸铁、混凝土和粘土管道的管道强度模型没有明确考虑劣化**-现场固化聚合物衬里的长期失效机制、其耐久性和预期使用寿命尚未确定，因此顾问和公用事业经理不知道这些修复将持续多长时间**-正在为维护孔(MH)开发喷雾衬里，但对衬里失效模式、粘结的重要性和喷涂衬里耐久性知之甚少(没有合理的程序可用于选择衬里厚度，旧MH的表面清洗和粗化对粘结力的影响尚不确定)**-需要通过识别控制泄漏的因素来消除新管道中过去的接头泄漏问题。**使用独特的埋地管道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。项目成果可以合并到标准、实践指南和规范中，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.