隧道施工项目六支护施工38课件.pptx

Tunnelconstruction

隧道施工

项目六支护施工Project6Supportconstruction任务一初期支护Initialsupport——喷射混凝土施工Shotcreteconstruction

学习目标Learningobjectives2知识目标Knowledgeobjectives能力目标Competencyobjectives通过本任务的学习，学生应掌握喷射混凝土的施工工艺流程；掌握喷射混凝土施工过程中的质量控制要点；Throughthestudyofthistask,studentsshouldmastertheconstructionprocessofshotcrete;Masterthekeypointsofqualitycontrolintheconstructionprocessofshotcrete;通过本任务的学习，学生应能初步具备喷射混凝土工程施工及质量控制能力、编制喷射混凝土作业技术交底的能力。Throughthestudyofthistask,studentsshouldbeabletoinitiallyhavetheabilityofsprayedconcreteengineeringconstructionandqualitycontrol,andtheabilitytoprepareshotcreteworktechnology.

二、喷射混凝土Shotcrete喷射混凝土的施工Constructionofshotcrete1.施工准备Constructionpreparation（1）工、料、机的准备：人工、材料、机械（具）的准备，核实品种、质量要求、足够储备量。喷射机械的就位，并试运转。(1)Preparationofwork,materialsandmachines:preparationoflabor,materials,machinery(equipment),verificationofvarieties,qualityrequirements,andsufficientreserves.Thejettingmachineryisinplaceandcommissioned.（2）湿喷场地的准备：检查隧道开挖断面的净空尺寸；冲洗受喷岩面；作喷射混凝土的厚度的标志；施工平面的布置，应满足施工工艺的要求；布置应力求紧凑，充分利用场地空间及运输线，避免施工干扰。Preparationofwetspraysites:checktheclearancedimensionsofthetunnelexcavationsection;Flushingofthesprayedrocksurface;Asasignofthethicknessofshotcrete;Thelayoutoftheconstructionplaneshouldmeettherequirementsoftheconstructionprocess;Thelayoutshouldbecompact,makefulluseofthesitespaceandtransportationlines,andavoidconstructioninterference.

二、喷射混凝土Shotcrete喷射混凝土的施工Constructionofshotcrete2.施喷作业Sprayingoperations（1）喷嘴与受喷岩面之间的距离和角度(1)Thedistanceandanglebetweenthenozzleandthesurfaceofthesprayedrock喷嘴与受喷岩面之间的最优距离是按喷混凝土的最高强度和最小回弹量来确定的，一般以0.6～1.8m为宜。角度：垂直喷射向受喷面，困难部位倾斜不大于10°。Theoptimaldistancebetweenthenozzleandthesurfaceofthesprayedrockisdeterminedbythemaximumstrengthandminimumreboundofthesprayedconcrete,anditisgenerallyappropriateto.8m0.6to1.Angle:Vertic