新加坡环线地铁工程的设计施工技术与坍塌应急处理方案讲座(2).ppt

新加坡环线地铁工程的设计施工技术与坍塌应急处理方案讲座(2).ppt

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RealTimeELSensorMonitoringForLTAC854atClunyParkRoadPurposeofInstrumentationInstrumentation&MonitoringWorkscanbecarriedoutto:

uVerifydesignassumptionsuAssesseffectsofconstructionmethodsuAssesstheneedforsupplementarypreventiveorremedialworksuProvidearecordofperformancesfortheauthorityuProvidedconfirmationtodesigndataMonitoringIntervalsReal-TimeMonitoringInstruments:

uInstrumentcanbeautomatedbyconnectingtothedataloggersystemandrealtimeprocessing/visualizationsoftware.uThetimeintervalfordataloggingandretrievalwillbesetaccordingtoconstructionrequirements.MonitoringResultsThemonitoringresultspresentedintherealtimedisplayandreportincludes:

uRotationaltiltingofstructuresuDifferentialSettlementofstructuresLocationPlanHouseNo.81&83SideViewELBeamSensorELTiltSensorHouseNo.81&83FrontViewELBeamSensorELTiltSensorHouseNo.85&87FrontViewELTiltSensorHouseNo.89&91FrontViewELTiltSensorSereneHouseEyeshotELTiltSensorFrenchEmbassyEyeshotELTiltSensorClunyCourtEyeshot（Shop-Houses）ELBeamSensorELTiltSensorELTiltSensorELtiltmetersareusedtomonitorchangesintheinclinationofastructure.Theyprovideanaccuratehistoryofmovementandearlywarningofpotentialstructuraldamage.Thenarrow-angleELtiltmeter（shownwithcoverremoved）measurestiltoverarangeof+/-40arcminutes.Itcandetectchangesassmallasonearcsecond（0.00028degree）.Itissuppliedwithatwo-pointmountingbracketforusewithgroutableanchors.ELBeamSensorThebeamsensorconsistsofanelectrolytictiltsensorattachedtoarigidmetalbeam.Thetiltsensorisaprecisionbubble-levelthatissensedelectricallyasaresistancebridge.Thebridgecircuitoutputsavoltageproportionaltothetiltofthesensor.Thebeam,whichistypically1to3meterslong,ismountedonanchorboltsthataresetintothestructure.MovementofthestructurechangesthetiltofthebeamandtheoutputofthesensorTheELbeamsensorcandetectachangeintiltassmallasonesecondofarc,equivalenttoamovementof0.005mmpermeterofbeam.TypicalInstallationofELTiltSensor

（1）InstallingAnchors1.Marklocationsforanchorholesasshownbelow.2.Drillanchorholesinstructuredeepenoughtoembedabout50mmofanchor.Removedebris.3.Attachmountingplatetoanchors.Thiswillkeeptheanchorsparallelwhilegrouthardens.4.Mixepoxygroutasdirectedbymanufacturer.Fillholeswithgrout,theninsertanchorswithmountingplateattached.TypicalInstallationofELTiltSensor

（2）5.Usealeveltocheckthatthesideandsurfaceofthemountingplatearevertical,asshownbelow.Keepplateincorrectpositionuntilgrouthardens.TypicalInstallationofELTiltSensor（3）6.Screwtiltmetertomountingplate.TypicalInstallationofELBeamSensor

（1）1.Marklocationsforanchorholes:

Drawahorizontallineonthestructure,thenmarkoffgaugelengthsforeachsensor.Linkedbeamsshareanchors.2.Drillanchorholestodepthofabout100mm.Takecaretodrillholesatsameangle.3.Removedebrisfromholes.Mixepoxygroutasdirectedbymanufacturer.Fillholewithgrout,theninsertanchor.4.Allowgrouttohardenbeforemountingbeam.5.Measurethecentertocenterdistancebetweeneachpairofanchors.6.Checkthatanchorsareparallel.Bendanchorsintoline,ifnecessary.7.Checkthatendbracketsareinsertedintobeams,butnotcompletelytight.TypicalInstallationofELBeamSensor

（2）9.Fastenendbracketofbeamsensortoanglebrackets.Hardwareisusuallysuppliedwithallwashersinplace.Usedrawingbelowtoseewhereendbracketsandanglebracketsfit.Tightennutssothatspringwashersarejustslightlycompressed.8.Fastenanglebracketstoanchors,asshowninthedrawingatrightInstrumentationDatabaseServerS&FWebServerRealTimeDataVisualizationELBeamSensorGSMModemGSMModemAlarmmessagessentbyemailsAlarmmessagesonmobilephoneorpagersGWWebClientsFirewallAlarmmessagessentbyemailsAlarmmessagesonmobilephoneorpagersAllowClienttoView/DownloadData,ReportandMethodStatementAnytimeAutoLoggingandRealTimeMonitoringSystemAcquisitionLoggingSystemELBeamSensorELBeamSensorELTiltSensorELTiltSensorELTiltSensor（SiteOffice/LTA）S&FLocalServerPastProjectPicturesandRealTimeDataVisualizationRealTimeELBeamMonitoringsystemSideView-realTimeELBeamSystemAutoLoggerSystemWireConnectionofAutoLoggerELTiltMonitoringTHANKYOU!

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