隧道施工-项目九 风水电作业和施工通风 Project 9 Wind water and power operation and construction ventilation-1742204859436

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隧道施工

任务二压缩空气供应——高压风管选定Task2Compressedairsupply——Highpressureductselection项目九风水电作业和施工通风Project9Wind,waterandpoweroperationandconstructionventilation2知识目标通过本任务的学习，学生应熟悉掌握高压风管选定的知识。。KnowledgeobjectivesThroughthestudyofthistask,studentsshouldbefamiliarwithandmastertheknowledgeofhigh-pressureairductselection.学习目标

Learningobjectives3能力目标通过本任务的学习，学生应具备确定高压风管管径的能力。。AbilityobjectivesThroughthestudyofthistask,studentsshouldhavetheabilitytodeterminethediameterofhigh-pressureairduct.学习目标

Learningobjectives风管(高压风管)管径的选择

Selectionofpipediameterofairduct(highpressureairduct)1.压缩空气通过管路损失后应能保证机械正常工作。空压机生产的压缩空气的压力一般在0.7~0.8MPa左右。2.要求：钢管终端的风压≮0.6MPa，胶皮管≮0.5MPa，即风压损失不超过0.1MPa。1.Thelossofcompressedairthroughthepipelineshallensurethenormaloperationofthemachinery.Thepressureofcompressedairproducedbytheaircompressorisgenerallyabout0.7~0.8MPa.2.Requirements:thewindpressureatthesteelpipeterminalis≮0.6MPa,Rubberhose≮0.5MPa,thatis,thewindpressurelossshallnotexceed0.1MPa.3.风压损失：Windpressureloss:式中：Where:其中：Q标为大气压强下的空气流量；P为空压机的压强（0.7MPa)。Where:Qistheairflowunderatmosphericpressure;Pisthepressureoftheaircompressor(0.7MPa).风管(高压风管)管径的选择

Selectionofpipediameterofairduct(highpressureairduct)4、如何选择风管直径：保证钢管终端的风压≮0.6MPa⑴首先拟订管径（150~200mm）；⑵然后计算风压损失ΔP；⑶判断ΔP是否小于0.1MPa；①若ΔP＜0.1MPa则管径选择合理；②若ΔP＞0.1MPa则不合理重新调整管径，将管径加大一级。4.Howtoselectductdiameter:Ensurethatthewindpressureatthesteelpipeterminalis≮0.6MPa(1)firstformulatethepipediameter(150~200mm);(2)thencalculatethewindpressurelossΔP；(3)judgmentΔWhetherPislessthan0.1MPa;①IfΔP<0.1MPa,thepipediameterisreasonable;②IfΔP>0.1MPaisunreasonableReadjustthepipediameterandincreasethepipediameterbyonelevel.风管(高压风管)管径的选择

Selectionofpipediameterofairduct(highpressureairduct)5.管路铺设要求（1）管道安装前应进行检查，钢管内不得留有残杂物和其他脏物；（2）应设在高压水管一侧，与电缆电线异侧；尽量缩短胶皮管的长度；（3）平顺直、接头严密、安装牢固；（4）安装闸阀、油水分离器；（5）宜尽量减少不必要的管路附件、弯头与分风设施，避免直径不一交错安装；（6）管道使用时，应有专人负责检查、养护。5.Pipelinelayingrequirements(1)Thepipelineshallbeinspectedbeforeinstallation,andthereshallbenodebrisandotherdirtinthesteelpipe;(2)Itshallbesetatonesideofthehigh-pressurewaterpipe,oppositetothecableandwire;Shortenthelengthofrubberhoseasmuchaspossible;(3)Smoothandstraight,tightjointsandfirminstallation;(4)Installgatevalveandoil-waterseparator;(5)Unnecessarypipelineaccessories,elbowsandairdistributionfacilitiesshouldbeminimizedtoavoidstaggeredinstallationwithdifferentdiameters;(6)Whenthepipelineisused,aspecialpersonshallberesponsible