大直径预应力钢筒混凝土管道裂缝产生机理与防治研究
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摘要
根据混凝土开裂机理,对管道裂缝产生原因、机制及防治措施进行了分析。结果认为,干缩变形、温度变形、结构应力等是管道裂缝产生的主要原因;不同部位裂缝的产生机制及防治措施不尽相同,虽然有些裂缝难以避免,但可通过有效防治使其处于微裂状态,而不致影响管道寿命。
According to the mechanism of cracking in general concrete structures,the reasons,mechanisms and preventing methods of cracking in PCCP were analyzed in this paper and some conclusions were drawn.Firstly,the reasons of cracking in PCCP included shrinkage,temperature effects and structural stress effects.Secondly,with its different locations and layers in PCCP,the cracks had different mechanisms,different widths,and different preventing methods.Finally,although some cracks could not be prevented completely,they could be controlled effectively,hence in a state of micro-cracking.
According to the mechanism of cracking in general concrete structures,the reasons,mechanisms and preventing methods of cracking in PCCP were analyzed in this paper and some conclusions were drawn.Firstly,the reasons of cracking in PCCP included shrinkage,temperature effects and structural stress effects.Secondly,with its different locations and layers in PCCP,the cracks had different mechanisms,different widths,and different preventing methods.Finally,although some cracks could not be prevented completely,they could be controlled effectively,hence in a state of micro-cracking.
引文
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[3]AmericanWaterWorksAssociation.StandardforPrestressedConcreteSteelCylinderPipe[S].ANSI/AWWAC301-99.
[4]张成军,陈尧隆,郭永峰.预应力钢筒混凝土管道蒸养制度分析与评价[J].水利水电技术,2004,(2):41-43.
[5]富文权,韩素芳.混凝土工程裂缝分析与控制[M].北京:中国铁道出版社,2002.
[6]FabianCHadipriono,RichardELarew,Oh-YoungLee.Servicelifeassessmentofconcretepipeculverts[J].JournalofTransportati Engineering,1988,114(2):209-220.
[7]MhdiSZarghamee.Hydrostaticpressuretestingofprestressedconcretecylinderpipewithbrokenwires[Z].Boltimore(America):T ASCEInternationalConferenceonPipelineEngineeringandConstruction,2003.
[8]周履,陈永春.收缩/徐变[M].北京:中国铁道出版社,1994.
[9]黄国兴,惠荣炎.混凝土的收缩[M].北京:中国铁道出版社,1990.
[10]孙绍平.阪神地震中给水管道震害及其分析[J].特种结构,1997,(2):51-55.
[11]HoelLing,YoshiyukiMohri,TshinoriKawabata,etal.Centrifugalmodelingofseismicbeihavioroflarge-diameterpipeinliquefiables[J].JournalofGeotechnicalandGeoenvironmentalEegineering,2003,129:1092-1102.
[12]魏新宇,马念尊,李杏敏.预应力钢筒混凝土管(PCCP)在给水管道工程中的应用[J].管道技术与设备,2001,(2):30-32.
[13]张之钰,郭建新,孟晋中.PCCP管道的设计特点[J].水利水电技术,2001,(4):55-57.
[14]吴悦人,黄玮,苏海滨.PCCP铠装式抗拉力接头的设计、试验及应用[J].特种结构,2003,(3):32-35.
[15]张永鸿.PCCP扩大推广应用的几个问题[J].特种结构,1999,(3):29-30.
[16]奚军.PCCP设计中的几点体会[J].山西水利科技,2002,(3):31-32.
[17]孙绍平,韩杨.生命线地震工程研究述评[J].土木工程学报,2003,(5):98-105.
[18]郭永峰,张成军,贾海亮.PCCP混凝土技术问题探讨[J].山西水利科技,2002,(3):43-46.
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