（英）衬砌厚度检测（冲击回拨声频法）课件讲解.pptx

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2024-07-29 发布于江苏
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（英）衬砌厚度检测（冲击回拨声频法）课件讲解.pptx

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TunnelSupportStructureInspectionTechnonlogyTrainingResourcePackageConcreteliningthicknessdetection

ConcreteaudiothicknessmeasurementDetectionPurpose1.Understandtheprincipleofshockechoaudiofrequencydetectionofconcretethickness；2.Mastertheuseandoperationstepsoftestingequipment;3.Masterdatacollectionanddataanalysismethods.

ShockechoacousticdetectionprincipleAshorttransientshock(tappingtheconcretesurfacewithasmallballorhammer)generatesanelasticshockwave,whichpropagatesintothestructureandisreflectedbackbythebottomsurfaceofthemember.Thereflectedfrequencyisobtainedbyspectrumanalysis(FFTorMEM),andtheconcretethicknesscanbetestedbycombiningtheobtainedwavespeedwithcalibration.Concreteaudiothicknessmeasurement

Instrumentandequipmentcomposition1.Shockechoaudiodetector（STL-IAES-B);2.Pickupsystem(AE01);3.Excitationdevice(T30);4.Microphonesignalline.Concreteaudiothicknessmeasurement

检测步骤VibrationdeviceconnectionPickupsystemconnectionPickupsystemconnectedtoaudiodetectorLayoutsurveylinesTheexcitationdevicegeneratesasignalThefirststepThesecondstepThethirdstepThefourthstepThefifthstepOperationprocedureConcreteaudiothicknessmeasurement

Detectionprocedure1.First,connectthesignallineoftheT30hammerofthebasevibrationdevicetotheCH1channeloftheshockechoaudiodetector.Concreteaudiothicknessmeasurement

2.Thenconnectthepickupsystemtothesignalline;ConcreteaudiothicknessmeasurementDetectionprocedure

3.Finally,connectthesignallineconnectedtothepickupsystemtotheCH0channeloftheshockechoaudiodetector.ConcreteaudiothicknessmeasurementDetectionprocedure

4.Duringtheon-siteinspection,theposition0.2mawayfromtheconstructionjointisusedasthestartingpoint;thestartingpointis1mabovetheground,andthesidelinesarearrangedatadistance