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Validating 'Fully Structural': Development and Testing of a New Carbon Composite in situ Pressure Barrier for Trenchless Rehabilitation of Small-Diameter Pressure Pipelines

机译：验证“完全结构化”：用于小直径压力管道的无沟槽修复的新型碳复合材料原位压力屏障的开发和测试

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Trenchless technologies similar to Cured in Place Pipe (CIPP) continue to be embraced for pipeline repair and rehabilitation since the first installation in the early 1970's. The varying levels of repair from corrosion mitigation, leak protection, to semi-structural and fully structural repair systems require alternating levels of strength, stiffness and durability properties under loading conditions. ASTM F1216 is widely used in water and wastewater pipelines to determine the required thickness of composite liners for semi structural (class Ⅱ and Ⅲ) and fully structural (class Ⅳ) repair/rehabilitation systems as defined in AWWA M28 Appendix A. It is important to understand the initial assumptions and limitations of these design guidelines. The ASTM F1216 was developed for felt-epoxy CIPP systems that demonstrate quasi-isometric properties. Likely because of this, longitudinal loading is not considered in this design process. As CIPP products continuously develop to resist increasing external and internal loading conditions, stronger materials are used in specific orientations to meet those increasing demands. When unidirectional glass and carbon reinforced polymers (GFRP and CFRP's) are used to meet the demands of high internal and external loading conditions, additional design criteria are required to cover both hoop direction and longitudinal loading. These additional design criteria extend beyond ASTM F1216. Thus, theoretical calculations from existing and developing pipeline standards, and experimental validation is required to demonstrate the capabilities of new technology utilizing high strength and high stiffness materials like CFRP. This paper will address the additional design considerations appropriate for CFRP pull-in-place rehabilitations and the validation of a fully structural CFRP in situ pressure barrier for small diameter (six to fourteen inch) pressure pipe.
机译：自1970年代初首次安装以来，类似于熟管（CIPP）的无沟槽技术一直被广泛用于管道维修和修复。从缓解腐蚀，防止泄漏到半结构和全结构修复系统，修复水平各不相同，需要在载荷条件下交替改变强度，刚度和耐用性。 ASTM F1216广泛用于给水和废水管道中，以确定AWWA M28附录A中定义的半结构（Ⅱ和Ⅲ级）和全结构（Ⅳ）维修/修复系统所需的复合衬里厚度。了解这些设计指南的最初假设和局限性。 ASTM F1216是为证明准等距特性的毡制环氧CIPP系统而开发的。因此，在此设计过程中不会考虑纵向载荷。随着CIPP产品不断发展以抵抗不断增加的外部和内部负载条件，在特定方向使用了更坚固的材料来满足这些不断增长的需求。当使用单向玻璃和碳增强聚合物（GFRP和CFRP）来满足高内部和外部载荷条件的要求时，需要额外的设计标准来涵盖环向和纵向载荷。这些额外的设计标准超出了ASTM F1216的范围。因此，需要根据现有和正在开发的管道标准进行理论计算，并进行实验验证，以证明利用高强度和高刚度材料（如CFRP）的新技术的功能。本文将介绍适用于CFRP现场修复的其他设计注意事项，以及用于小直径（六到十四英寸）压力管的全结构CFRP现场压力屏障的验证。

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