| 预应力钢筒混凝土管体外预应力加固试验研究 |
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| 引用本文： | 赵丽君,窦铁生,程冰清,夏世法,张弢,毕然.预应力钢筒混凝土管体外预应力加固试验研究[J].水利学报,2019,50(7):844-853. |
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| 作者姓名： | 赵丽君 窦铁生 程冰清 夏世法 张弢 毕然 |
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| 作者单位： | 流域水循环模拟与调控国家重点实验室, 中国水利水电科学研究院, 北京 100038,流域水循环模拟与调控国家重点实验室, 中国水利水电科学研究院, 北京 100038,流域水循环模拟与调控国家重点实验室, 中国水利水电科学研究院, 北京 100038,流域水循环模拟与调控国家重点实验室, 中国水利水电科学研究院, 北京 100038,北京市水利规划设计研究院, 北京 100048,北京市水利规划设计研究院, 北京 100048 |
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| 基金项目： | 国家自然科学基金项目（50979116）；北京市科委重大专项课题（Z141100006014058）；中国水科院科研专项（SM0145B632017）；南水北调干线管理处研究项目（GXGLC-JSZX-2017-CG01） |
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| 摘 要： | 预应力钢筒混凝土管(PCCP)断丝后,管芯混凝土在荷载作用下会发生开裂,影响PCCP的承载能力。目前针对PCCP断丝管的加固有多种方法。其中利用钢绞线施加体外预应力加固PCCP断丝管的方法能够主动补偿由于断丝导致的预应力损失,同时做到整个管线减压不停水。本文通过PCCP加载-断丝-管体管芯混凝土开裂-减压-施加体外预应力-加载到设计荷载的全过程原型试验,研究了PCCP体外预应力加固效果。并针对试验过程中各阶段PCCP管体的力学特性和变形特点进行分析。试验结果表明,通过钢绞线对PCCP断丝管施加体外预应力进行加固,管体裂缝闭合,承载能力恢复至设计内压0.9 MPa,钢绞线仍处于弹性阶段,管体水密性良好,加固效果明显。
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| 关 键 词： | 预应力钢筒混凝土管(PCCP) 体外预应力 钢绞线 断丝 加固效果 |
| 收稿时间： | 2019/4/1 0:00:00 |
A prototype test study on the reinforcement effect of prestressed concrete cylinder pipe with external prestressed steel strands |
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| ZHAO Lijun,DOU Tiesheng,CHENG Bingqing,XIA Shif,ZHANG Tao and BI Ran.A prototype test study on the reinforcement effect of prestressed concrete cylinder pipe with external prestressed steel strands[J].Journal of Hydraulic Engineering,2019,50(7):844-853. |
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| Authors: | ZHAO Lijun DOU Tiesheng CHENG Bingqing XIA Shif ZHANG Tao and BI Ran |
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| Affiliation: | State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China,State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China,State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China,State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China,Beijing Institute of Water, Beijing 100048, China and Beijing Institute of Water, Beijing 100048, China |
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| Abstract: | Prestressed concrete cylinder pipe (PCCP) with broken wires suffers from longitudinal cracks in core concrete considering the continuous loads. Compared with other reinforcement methods applied in the field of PCCP, the reinforcement with external prestressed strands is able to actively compensate the prestress loss caused by broken prestressing wires and also unnecessary to dewater the pipes during construction. To assess the reinforcement effect of PCCP with external prestressed strands,a prototype test of PCCP including compression-breaking wires-decompression-tensioning-compression was conducted. The analysis of mechanical characteristics and deformation characteristics of PCCP at various stages in the test process has been analyzed. When the internal water pressure gradually increased to the design pressure of 0.9 MPa to verify the reinforcement effect of the PCCP with external prestressed steel strands, the strain of the core concrete changed slightly and the width of cracks in the outer core concrete was maintained at 0.1mm. The visible cracks of the reinforced PCCP were constrained and closed at some degree. The strengthened pipe was capable to sustain the design internal water pressure and the water tightness property was in a good state. The reinforcement effect of PCCP with external prestressed steel strands is evident. |
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| Keywords: | prestressed concrete cylinder pipe(PCCP) external prestressed steel strands wires breakage reinforcement effect |
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