（英）混凝土衬砌强度检测（回弹法）课件讲解

TunnelSupportStructureInspectionTechnonlogyTrainingResourcePackageStrengthdetectionofconcreteliningStrengthdetectionofconcreteliningDetectionpurpose1.Understandtheprincipleofthereboundmethodtodetectthestrengthofconcretelining;2.Mastertheuseandoperationstepsoftestinginstruments;3.Masterdatacollectionanddataanalysismethods.Detectionprincipleofreboundmethod

Sincethereisacertaincorrelationbetweenthecompressivestrengthofconcreteanditssurfacehardness,thehammerofthereboundhammerishitontheconcretesurfacebyacertainelasticforce,thereboundheight(reboundvaluereadbythehammer)isproportionaltothehardnessoftheconcretesurface.therefore,thesurfacehardnessofconcreteisreflectedbythereboundvalue,andthecompressivestrengthofconcretecanbecalculatedaccordingtothesurfacehardness.StrengthdetectionofconcreteliningInstrumentandequipmentcomposition1.Digitalreboundtester(CE);2.Carbonizationdepthmete,hairpin；3.bultsyringe；4.1%to2%phenolphthaleinalcoholsolution.Strengthdetectionofconcretelining

NumberofsurveyareasSurveyarearequirementsDataanalysisThefirststep第三步ThefourthstepDatacollectionThethirdstepOperationprocedureStrengthdetectionofconcreteliningThesecondstepDetectionprocedure

1.Forgeneralcomponents,thenumberofsurveyareasshouldnotbelessthan10.Whenthenumberofinspectedcomponentsisgreaterthan30andthepresumedstrengthofasinglecomponentdoesnotneedtobeprovided,orwhenthedimensionoftheinspectedcomponentinonedirectionisgreaterthan4.5mandthedimensionintheotherdirectionisnotgreaterthan0.3m,thenumberofinspectionareasforeachcomponentmaybeappropriatelyreduced.butnotlessthan5;

Strengthdetectionofconcretelining2.Thedistancebetweentwoadjacentmeasuringareasshouldnotbegreaterthan2m.thedistancebetweenthemeasuringareaandtheendofthecomponentortheedgeoftheconstructionjointshouldnotbegreaterthan0.5m,andshouldnotbelessthan0.2m.StrengthdetectionofconcreteliningDetectionprocedure

3.Themeasuringareashouldbeselectedonthesideoftheconcretepouringthatcanmakethehammerinthehorizontaldirection.Whenthisrequirementcannotbemet,itisalsooptionaltoplacethehammerinthenon-horizontaldirectionoftheconcretepouringsurfaceorbottom；StrengthdetectionofconcreteliningDetectionprocedure4.Themeasurementareashouldbearrangedontwosymmetricalmeasurablesurfacesofthecomponent.Ifitcannotbearrangedonthesymmetricalmeasurablesurfaces,itcanalsobearrangedonthesamemeasurablesurfaceandshouldbeevenlydistributed.Themeasuringareashouldbearrangedintheimportantpartsandweakpartsofthecomponents,andtheembeddedpartsshouldbeavoided;StrengthdetectionofconcreteliningDetectionprocedure

5.Theareaofthesurveyareashouldnotbelargerthan0.04m2；StrengthdetectionofconcreteliningDetectionprocedure

6.Thesurfaceofthemeasurementareashouldbetheoriginalconcretesurface,whichshouldbecleanandsmooth,andthereshouldbenolooselayer,laitance,grease,coating,honeycomb,andpockmarkedsurface.DetectionprocedureStrengthdetectionofconcretelining

1.Rebounddatacollection:Turnonthedigitaldisplayreboundtesterswitchandcompletetheparametersettingtocollectdata.Whenmeasuringthereboundvalue,theaxisofthehammershouldalwaysbeperpendiculartotheconcretetestingsurface,andshouldapplypressureslowly,readaccurately,andresetquickly.Eachmeasuringareashouldread16reboundvalues,andthereboundvaluereadingofeachmeasuringpointshouldbeaccurateto1.Themeasuringpointsshouldbeevenlydistributedwithinthemeasuringarea,andthenetdistancebetweentwoadjacentmeasuringpointsshouldnotbelessthan20mm;thedistancebetweenthemeasuringpointsandtheexposedsteelbarsandembeddedpartsshouldnotbelessthan30mm;themeasuringpointsshouldnotbeonairholesorexposedstones,andthesameThemeasuringpointshouldonlybehitonce;StrengthdetectionofconcreteliningDatacollection

2.Carbonizationdepthdatacollection:Afterthereboundvalueismeasured,measurethecarbonizationdepthvalueonarepresentativemeasurementarea.Thenumberofmeasurementpointsshouldnotbelessthan30%ofthenumberofmeasurementareasofthecomponent,andtheaveragevalueshouldbetakenaseachmeasurementareaofthecomponent.Thecarbonationdepthvalueofthezone.Whenthecarbonizationdepthvaluerangeisgreaterthan2.0mm,thecarbonizationdepthvalueshallbemeasuredseparatelyineachmeasurementarea.Useahairpintoformaholewithadiameterofabout15mmonthesurfaceofthemeasurementarea;StrengthdetectionofconcreteliningDatacollection

3.Removethepowderanddebrisinthehole,anddonotscrubwithwater;use1%~2%phenolphthaleinalcoholsolutiontodropontheedgeoftheinnerwallofthehole;StrengthdetectionofconcreteliningDatacollection

4.Whentheboundarybetweencarbonizedanduncarbonizedisclear,useacarbonizationdepthmeasuringinstrumenttomeasuretheverticaldistancefromtheinterfaceofcarbonizedanduncarbonizedconcretetotheconcretesurface,andshouldmeasure3times,andeachreadingshouldbeaccurateto0.25mm;threemeasurementsshouldbetakentheaveragevalueisusedasthetestresultandshouldbeaccurateto0.5mm.StrengthdetectionofconcreteliningDatacollectionDataanalysis

Calculationofstrengthpresumedvalue:firstcalculatetheaveragereboundvalueofthemeasurementarea,remove3maximumvaluesand3minimumvaluesfromthe16reboundvaluesofthemeasurementarea,andcalculatetheremaining10reboundvaluesasfollows:——Theaveragereboundvalueofthetestarea,accurateto0.1;——Reboundvalueofmeasuringpointi.Aftertheaveragespringbackvalueisobtained,theangleshouldbecorrectedaccordingtotherequirementsofthespecification,andthepouringsurfaceshouldbecorrectedforthecorrectedspringbackvalue.Thefinalrevisedaveragespringbackvalueiscombinedwiththecarbonizationdepthvaluetoconsultthespecificationtoobtainthestrengthconversionvalue.Strengthdetectionofconcretelining

Theaveragevalueoftheconcretestrengthofthemeasuringareaofthecomponentshallbecalculatedaccordingtotheconcretestrengthanddegreeconversionvalueofeachmeasuringarea.Whenthenumberoftestareasis10ormore,theintensitystandarddeviationshouldalsobecalculated.Themeanandstandarddeviationshouldbecalculatedaccordingto