隧道施工任务三隧道周边净空收敛量测收敛计使用TaskCo.pptx

Tunnelconstruction

隧道施工

任务三隧道周边净空收敛量测--收敛计使用Task3:Convergencemeasurementofclearancearoundtunnel--Useofconvergencemeter项目七监控量测Item7Monitoringandmeasurement

2知识目标通过本任务的学习，学生应了解收敛计的结构和原理，掌握收敛计的操作过程。KnowledgeobjectivesThroughthestudyofthistask,studentsshouldunderstandthestructureandprincipleofconvergencemeterandmastertheoperationprocessofconvergencemeter.学习目标

Learningobjectives

3能力目标通过本任务的学习，学生应具备收敛计使用的能力；具有一丝不苟的工匠精神。AbilityobjectivesThroughthestudyofthistask,studentsshouldhavetheabilitytouseconvergencemeter;Withmeticulouscraftsmanspirit.学习目标

Learningobjectives

周边收敛的概念Conceptofperipheralconvergence隧道周边位移是指隧道周边上两点间相对位置的变化。隧道开挖后，围岩向坑道方向的位移是围岩动态的最显著表现，最能反映出围岩（或围岩加支护）的稳定性。隧道内壁两点连线方向的相对位移称为周边收敛，收敛值为两次量测的距离之差，可以反映洞室的工作状态和受力性状，进而指导现场设计和施工。隧道周边收敛peripheralconvergenceThedisplacementaroundthetunnelreferstothechangeoftherelativepositionbetweentwopointsaroundthetunnel.Aftertunnelexcavation,thedisplacementofsurroundingrocktothetunneldirectionisthemostsignificantmanifestationofsurroundingrockdynamics,whichcanbestreflectthestabilityofsurroundingrock(orsurroundingrockwithsupport).Therelativedisplacementinthedirectionoftheconnectinglinebetweentwopointsontheinnerwallofthetunneliscalledperipheralconvergence.Theconvergencevalueisthedifferencebetweenthetwomeasureddistances,whichcanreflecttheworkingstateandstressbehaviorofthetunnel,andthenguidetheon-sitedesignandconstruction.

收敛计的结构Structureofconvergencemeter收敛计的结构Structureofconvergencemeter数显窗口Digitaldisplaywindow钢卷尺Steeltape旋转调节螺母Rotatetheadjustingnut张力标示窗口Tensionmarkingwindow尺卡、尺销Rulerclamp,rulerpin挂钩Hanger

收敛计的原理Principleofconvergencemeter遵循机械传递位移的原理，通过调节螺母，改变收敛计机体长度可产生对钢尺的恒定张力，保证量测的准确性及可比性。机体长度的改变量，由数显电路测出。Followingtheprincipleofmechanicaltransmissionofdisplacement,byadjustingthenutandchangingthelengthof