先张法预应力空心板病害分析及处置对策研究.pdf

第3卷第20期现代工程科技Vol.3No.20

2024年10月ModernEngineeringTechnologyOct.2024

先张法预应力空心板病害分析及处置对策研究

陈占毅

广州市道路事务中心，广东广州510000

摘要：先张法预应力空心板梁桥应用广泛，经过多年运营后逐渐出现底板纵向裂缝、底板横向裂缝、腹板斜向裂

缝及铰缝损伤等多种典型病害。这些病害产生的主要原因是设计缺陷及施工质量缺陷，交通荷载作用和环境侵蚀是

病害发展的直接原因。为做好空心板梁的养护维修，建议采用底板灌浆修复底板纵向裂缝，采用HB-FRP加固法修

复底板跨中横向裂缝，采用“植筋＋高性能混凝土浇筑”工艺提升梁端抗剪承载能力。铰缝根据损坏程度可针对性

地采用灌浆加固、重做现浇层和重做铰缝等方式提升桥梁整体刚度。

关键词：先张法预应力；空心板；典型病害；处置对策

中图分类号：U445.7文献标识码：A

ResearchonDiseasesAnalysisandTreatmentStrategiesofPre-tensioning

PrestressedBeam

ChenZhanyi

GuangzhouRoadAffairsCenter,Guangzhou,Guangdong510000

Abstract:Theapplicationofpre-stressedhollowslabbeambridgesiswidespread.Afteryearsofoperation,theygraduallyexhibit

varioustypicaldiseasessuchaslongitudinalcracksinthebottomslab,transversecracksinthebottomslab,diagonalcracksinthe

webs,anddamagetothehingedjoint.Themaincausesofthesediseasesaredesigndefectsandconstructionqualitydefects,whilethe

actionoftrafficloadsandenvironmentalerosionarethedirectcausesoftheirdevelopment.Toproperlymaintainandrepairhollow

slabbeams,itisrecommendedtousebottomslabgroutingtorepairlongitudinalcracksinthebottomslab,HB-FRPreinforcement

methodtorepairtransversecracksinthemiddleofthebottomslab,and“rebarplanting+high-performanceconcretepouring”

technologytoenhancetheshearbearingcapacityatthebeamends.Accordingtothedegreeofdamage,thehingejointcanbe

reinforcedwithgrouting,thecast-in-placelayercanberemade,andthehingejointcanberemadetoimprovethe