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首页> 外文期刊>Tunnelling and underground space technology >Field evaluation of performance of corroded corrugated steel pipe before and after sliplining rehabilitation
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Field evaluation of performance of corroded corrugated steel pipe before and after sliplining rehabilitation

机译：腐蚀腐蚀钢管前后腐蚀腐蚀钢管性能的现场评估

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摘要

Corrugated steel pipes installed under roadways several decades ago are reaching the end of their service lives. Excavation and replacement of these buried structures cause disruption to the transportation network and require significant funding. Trenchless rehabilitation methods have been increasingly used to reduce the overall cost of a project and disruption to the transportation network as compared with excavation and replacement. Sliplining, as one of the trenchless methods, has been used to rehabilitate buried corroded corrugated steel pipes. In this method, a new pipe of smaller diameter (i.e., liner) is placed inside an existing corroded steel pipe and the space between them is grouted. In this field study, the effect of sliplining rehabilitation on the performance of a highly corroded corrugated steel pipe, which was placed at a depth of 0.4 m under an asphalt pavement, was investigated. The steel pipe and the high-density polyethylene liner had nominal diameters of 610 and 560 mm, respectively. A low-viscosity grout was used to fill the space between the steel pipe and the liner. A series of truck loading and plate loading tests were conducted before and after the steel pipe was rehabilitated with a liner and grouting to determine: (1) load-carrying behavior and stiffness; (2) vertical and horizontal diameter changes; (3) average strain and curvature of pipes; and (4) displacement of the pavement surface. Moreover, deformations, strains, and curvatures around the circumference of the liner were monitored during sliplining and at 7 and 28 days after grouting. The sliplined corroded steel pipe behaved considerably stiffer than that before sliplining rehabilitation. The monitored deflection of the liner indicates that the liner was under compression at 7 days after grouting. At 28 days after grouting, the sliplining rehabilitation reduced the vertical diameter changes of the corroded steel pipe by approximately 81.5% under truck loading. In the field plate loading tests, the sliplining rehabilitation reduced the displacement of the pavement by 6% and 31%, and the vertical diameter changes of the corroded steel pipes by 87% and 90%, respectively, at 7 and 28 days after rehabilitation as compared with those before rehabilitation. The sliplining rehabilitation increased the load-carrying capacity of the corroded steel pipe by approximately 300%.
机译：几十年前，在道路道下安装的波纹钢管正在达到其服务生活的结束。挖掘和更换这些埋设结构导致运输网络中断，需要大量资金。与挖掘和更换相比，巨大的康复方法越来越多地用于降低项目的总成本和对运输网络的干扰。作为其中一个挖沟方法之一，Sliplining已被用于恢复埋地腐蚀瓦楞钢管。在该方法中，将较小直径（即，衬里）的新管道放置在现有的腐蚀钢管内，并且它们之间的空间灌注。在该场研究中，研究了恢复对高度腐蚀性波纹钢管性能的效果，该钢管在沥青路面下置于0.4μm的深度。钢管和高密度聚乙烯衬垫的标称直径分别为610和560mm。使用低粘度灌浆来填充钢管和衬里之间的空间。在用衬里恢复钢管和灌浆之前和之后进行一系列卡车装载和板材试验以确定：（1）承载行为和刚度; （2）垂直和水平直径变化; （3）管道的平均应变和曲率; （4）路面表面的位移。此外，在灌浆后7和28天内监测衬里周长周围的变形，菌株和曲率围绕衬里的圆周。滑动腐蚀钢管的表现得比滑倒康复前的腐蚀性相比。衬里的监测偏转表明灌浆后7天内的衬里在压缩下。在灌浆后28天，滑动康复将腐蚀钢管的垂直直径变化降低了卡车装载下的81.5％。在现场板装载试验中，滑动康复将路面的位移减少6％和31％，腐蚀钢管的垂直直径变化分别为87％和90％，在康复后7和28天分别为7和28天与康复之前的那些相比。滑动康复将腐蚀钢管的承载能力提高约300％。

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