隧道施工-項目九 風水電作業(yè)和施工通風 Project 9 Wind water and power operation and construction ventilation-1742204859436

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隧道施工

任務二壓縮空氣供應——高壓風管選定Task2Compressedairsupply——Highpressureductselection項目九風水電作業(yè)和施工通風Project9Wind,waterandpoweroperationandconstructionventilation2知識目標通過本任務的學習，學生應熟悉掌握高壓風管選定的知識。。KnowledgeobjectivesThroughthestudyofthistask,studentsshouldbefamiliarwithandmastertheknowledgeofhigh-pressureairductselection.學習目標

Learningobjectives3能力目標通過本任務的學習，學生應具備確定高壓風管管徑的能力。。AbilityobjectivesThroughthestudyofthistask,studentsshouldhavetheabilitytodeterminethediameterofhigh-pressureairduct.學習目標

Learningobjectives風管(高壓風管)管徑的選擇

Selectionofpipediameterofairduct(highpressureairduct)1.壓縮空氣通過管路損失后應能保證機械正常工作?？諌簷C生產(chǎn)的壓縮空氣的壓力一般在0.7~0.8MPa左右。2.要求：鋼管終端的風壓≮0.6MPa，膠皮管≮0.5MPa，即風壓損失不超過0.1MPa。1.Thelossofcompressedairthroughthepipelineshallensurethenormaloperationofthemachinery.Thepressureofcompressedairproducedbytheaircompressorisgenerallyabout0.7~0.8MPa.2.Requirements:thewindpressureatthesteelpipeterminalis≮0.6MPa,Rubberhose≮0.5MPa,thatis,thewindpressurelossshallnotexceed0.1MPa.3.風壓損失：Windpressureloss:式中：Where:其中：Q標為大氣壓強下的空氣流量；P為空壓機的壓強（0.7MPa)。Where:Qistheairflowunderatmosphericpressure;Pisthepressureoftheaircompressor(0.7MPa).風管(高壓風管)管徑的選擇

Selectionofpipediameterofairduct(highpressureairduct)4、如何選擇風管直徑：保證鋼管終端的風壓≮0.6MPa⑴首先擬訂管徑（150~200mm）；⑵然后計算風壓損失ΔP；⑶判斷ΔP是否小于0.1MPa；①若ΔP＜0.1MPa則管徑選擇合理；②若ΔP＞0.1MPa則不合理重新調(diào)整管徑，將管徑加大一級。4.Howtoselectductdiameter:Ensurethatthewindpressureatthesteelpipeterminalis≮0.6MPa(1)firstformulatethepipediameter(150~200mm);(2)thencalculatethewindpressurelossΔP；(3)judgmentΔWhetherPislessthan0.1MPa;①IfΔP<0.1MPa,thepipediameterisreasonable;②IfΔP>0.1MPaisunreasonableReadjustthepipediameterandincreasethepipediameterbyonelevel.風管(高壓風管)管徑的選擇

Selectionofpipediameterofairduct(highpressureairduct)5.管路鋪設(shè)要求（1）管道安裝前應進行檢查，鋼管內(nèi)不得留有殘雜物和其他臟物；（2）應設(shè)在高壓水管一側(cè)，與電纜電線異側(cè)；盡量縮短膠皮管的長度；（3）平順直、接頭嚴密、安裝牢固；（4）安裝閘閥、油水分離器；（5）宜盡量減少不必要的管路附件、彎頭與分風設(shè)施，避免直徑不一交錯安裝；（6）管道使用時，應有專人負責檢查、養(yǎng)護。5.Pipelinelayingrequirements(1)Thepipelineshallbeinspectedbeforeinstallation,andthereshallbenodebrisandotherdirtinthesteelpipe;(2)Itshallbesetatonesideofthehigh-pressurewaterpipe,oppositetothecableandwire;Shortenthelengthofrubberhoseasmuchaspossible;(3)Smoothandstraight,tightjointsandfirminstallation;(4)Installgatevalveandoil-waterseparator;(5)Unnecessarypipelineaccessories,elbowsandairdistributionfacilitiesshouldbeminimizedtoavoidstaggeredinstallationwithdifferentdiameters;(6)Whenthepipelineisused,aspecialpersonshallberesponsible