大口径PCCP断丝加固技术工程应用和效果评价  

Engineering Practice and Effect Evaluation of Reinforcement Technologies for Large-Diameter PCCP with Broken Wires

作　　者：赵绍华 王英歌 张海鹏 窦铁生[2] 赵祎 ZHAO Shao-hua;WANG Ying-ge;ZHANG Hai-peng;DOU Tie-sheng;ZHAO Yi(Route Management Office of the South-to-North Water Diversion of Beijing,Beijing 100097,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Municipal River and Lake Administration of Beijing,Beijing 100089,China)

机构地区：[1]北京市南水北调干线管理处,北京100097 [2]中国水利水电科学研究院,北京100038 [3]北京市城市河湖管理处,北京100089

出　　处：《混凝土与水泥制品》2023年第4期39-43,53,共6页China Concrete and Cement Products

摘　　要：针对埋地预应力钢筒混凝土管(PCCP)的断丝现象,介绍了常用的三种加固方案,即在断丝管节内壁粘贴碳纤维片材、对断丝管节进行体外预应力加固以及更换断丝管节进行修补加固。为了验证这些加固技术的应用效果,对断丝管节加固前后的断丝数据及冬、夏季典型时段断丝数据进行了分析,并对加固方案效果进行了评价。结果表明:碳纤维加固不能显著减少断丝的持续发生;体外预应力加固效果明显,可基本解决断丝的发生,是相对可靠的断丝管节加固技术;更换断丝管节需耗费大量的人、财、物,适用于管线应急修复。Due to the broken wires phenomenon of buried prestressed concrete cylinder pipes(PCCP),the reinforcement technology methods of pasting CFRP on the inner wall,strengthening with external prestressed steel strands and replacing the broken pipes were introduced.In order to determine the practical effect of reinforcement technology,the datas of broken wires before and after the reinforcement of broken pipes and the datas of broken wires during typical periods in winter and summer were studied and analyzed.The results show that the reinforement technology with CFRP cannot reduce the continuous occurrence of broken wires.The reinforcement technology with external prestressed steel strands has obvious reinforcement effect,which can basically solve the occurrence of broken wires,so it is a reliable reinforcement technology for the pipelines with broken wires.The replacement of the broken pipe requires a lot of people and property,and is suitable for pipeline emergency repair.

关 键 词：预应力钢筒混凝土管(PCCP) 断丝 加固技术 碳纤维片材 钢绞线 

分 类 号：TU528.7[建筑科学—建筑技术科学]