准东供水工程PCCP预应力钢丝完整性检测及结构评估  

Integrity Inspection of Prestressed Wire and Structural Evaluation of PCCP in Zhundong Water Supply Project

作　　者：徐维强 王五平 

机构地区：[1]新疆昌源水务准东供水有限公司,乌鲁木齐830099 [2]蓬勃(上海)工程技术服务有限公司,南京210019

出　　处：《特种结构》2017年第2期113-116,共4页Special Structures

摘　　要：PCCP管道投入运行后,有多种原因会造成预应力钢丝断裂。通过检测PCCP中预应力钢丝的完整性并对出现断丝后的管道进行结构计算,可以评估失效风险,为制定维修方案提供依据。采用电磁法断丝检测技术,对准东供水"500"东延工程10#闸至五彩湾段PCCP管线进行了抽样检测,发现部分管道出现疑似断丝。利用三维非线性有限元模型,计算生成能够反映断丝影响的有限元性能曲线,得出了在工作压力及水锤压力的共同作用下,管道达到微裂缝极限、可见裂缝极限、屈服极限和强度极限时所允许的断丝数量,根据断丝最严重管道的实际断丝数量与极限允许断丝数量的关系确定维修方案,为类似工程提供参考。Prestressed wire in prestressed concrete cylinder pipe （PCCP） may break for various reasons after putting in operation. Through integrity inspection of prestressed wire and structural analysis of distressed PCCP, failure risk can be evaluated, which provides the basic information for the rehabilitation plan. Sampling inspec- tion with electromagnetic method was performed on PCCP between 10# sluice and Wucaiwan of ＂500＂ East Ex- tension Project. Suspicious broken wire wraps were found in some pipe sections. Three-dimensional nonlinear fi- nite element analysis was conducted to generate FEA performance curve which can reflect the effect of broken wire wraps. The tolerance number of broken wire to exceed micro cracking limit, visible cracking limit, yield limit and strength limit under the operational and surge pressure were obtained. Rehabilitation plan was deter- mined based on comparing the number of suspicious broken wire wraps in the most serious distressed pipe and the limit tolerance number, which can provide reference for similar project.

关 键 词：PCCP 预应力钢丝 完整性 电磁法检测 结构评估 

分 类 号：TU991[建筑科学—市政工程]