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首页> 外文会议>North American Society for Trenchless Technology (NASTT) no-dig show >Applications of Pipe Penetrating Radar for Advanced Pipe Condition Assessments – Clark Regional Wastewater District (WA) Case Study
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Applications of Pipe Penetrating Radar for Advanced Pipe Condition Assessments – Clark Regional Wastewater District (WA) Case Study

机译：探管雷达在高级管道状况评估中的应用– Clark地区废水区（WA）案例研究

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摘要

Pipe Penetrating Radar (PPR) is the underground in-pipe application of Ground Penetrating Radar (GPR), a nondestructiverntesting method that can detect defects and cavities within and outside mainline diameter non-metallicrn(reinforced concrete, vitrified clay, PVC, HDPE, etc.) underground pipes. The key advantage of PPR is the uniquernability to map pipe wall thickness and deterioration including voids outside the pipe, enabling accurate predictabilityrnof needed rehabilitation or the timing of replacement. By having this information available, engineers andrnmunicipalities can better estimate the remaining life left in a pipeline, refine timing of repairs, and ultimately betterrnallocate funding for asset management.rnThis paper presents recent advancement of PPR inspection technology together with the robotic, Vancouver, WArncase study. Clark Regional Wastewater District, the owner of the Salmon Creek Interceptor and St Johns Trunk linesrncommissioned a condition assessment on the 21, 24 and 36 inch concrete lines. For the St. Johns Trunk, a 36-inchrnline, corrosion was suspected and evidence was observed visually by Closed-Circuit Television (CCTV). Chemicalrndosing had been implemented to minimize continued corrosion due to vapor-phase H2S, but the District wanted tornquantitatively determine the extent of corrosion and if/when future rehabilitation would be needed. PPR confirmedrnthe upstream-most segment had corroding/missing reinforcement and reduced wall thickness.rnFor the Salmon Creek Interceptor, 21-inch and 24-inch lines, visual CCTV inspections revealed the inner cementrnlayer had deteriorated. In these pipe sizes, the District was unsure if these pipes had reinforcement. PPR was used torndetermine changes in wall thickness and if reinforcement was present. The PPR results confirmed that the 21-inchrnconcrete sewer was unreinforced and the observed corrosion had structural implications. The 24-inch segment wasrnreinforced and had uniform pipe wall thickness with sufficient rebar cover. Subsequent coring improved the velocityrncalculations for the 21-inch and 24-inch pipe and confirmed and verified the PPR pipe wall thickness.rnThe use of PPR combined with man-entry coring and CCTV data provided the necessary information for the Districtrnto understand the condition of these critical trunk lines. In Salmon Creek and St. Johns Trunk corrosion was knownrnbut could not be quantified. PPR provided that critical information and confirmed the extent of the damage and thernneed for restoration work. It also confirmed that there were no significant issues outside the pipe. Furthermore, PPRrnprovided objective data to be communicated to management and to the Commissioners.
机译：探管雷达（PPR）是探地雷达（GPR）的地下管道应用，这是一种非破坏性测试方法，可以检测干线直径非金属（钢筋混凝土，玻璃化粘土，PVC，HDPE等）内外的缺陷和空腔。）地下管道。 PPR的主要优点是能够绘制出管壁厚度和劣化（包括管外空隙）的映射图的独特性，从而能够准确预测可修复性或更换时机。通过获得这些信息，工程师和市政机构可以更好地估计管道中的剩余寿命，优化维修时间，并最终更好地分配用于资产管理的资金。本文介绍了PPR检查技术的最新进展以及机器人技术在温哥华市的研究。鲑鱼溪拦截器和圣约翰干线公司的所有者克拉克地区废水区委托对21英寸，24英寸和36英寸混凝土管线进行状态评估。对于36英寸长的圣约翰树干，怀疑存在腐蚀，闭路电视（CCTV）目视观察到证据。已实施化学计量以最大程度地减少由于气相H2S引起的持续腐蚀，但是该地区希望定量确定腐蚀的程度以及是否/何时需要进行修复。 PPR确认最上游的部分已腐蚀/缺失钢筋并减小了壁厚。rn对于Salmon Creek拦截器的21英寸和24英寸管线，目视闭路电视检查显示内部水泥层已经变质。在这些管道尺寸中，学区不确定这些管道是否加固。 PPR用于确定壁厚的变化以及是否存在钢筋。 PPR结果证实了21英寸的混凝土下水道没有加固，并且观察到的腐蚀对结构有影响。对24英寸管段进行了加固，并具有均匀的管壁厚度和足够的钢筋覆盖层。随后的取芯改善了21英寸和24英寸管道的速度计算，并确认并验证了PPR管的壁厚。rn PPR结合人工取芯和CCTV数据的使用为学区了解这些条件提供了必要的信息。关键干线。在Salmon Creek和St. Johns Trunk，腐蚀是已知的，但无法量化。 PPR提供了关键信息，并确认了损坏的程度以及修复工作的需要。它还确认管道外部没有重大问题。此外，PPRrn提供了要传达给管理层和专员的客观数据。

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