PE管水平定向钻最大拖拉力的探讨

摘 要

红包的意义:Againstthebackdropofrelativelyweakglobaleconomicgrowthandmuchchallengedglobalgovernance,theDonaldTrumpadministrationintheUnitedStateshassetan"exclusive"economicagendaof"AmericaFirst"and"MakeAmericaGreatAgain".Thesupposedoppositiontofreetradeandthusglobalizationbytheworld'sbiggesteconomycouldalteritsrelationshipswithChina,AustraliaandNewZealand,andchangethewayinternationalinstitutionsfunction.Besides,theEuropeanUnionisfacedwithuncertainties,especiallyonthepoliticalfront.AndtheUnitedKingdomofficiallystartedthe"Brexit"processonWednesday,castingashadowovertheleadershipandgovernanceoftheEuropeanUnion.Ontheotherhand,AustraliaandNewZealand,likeChina,aretryingtointensifyreforms,whichshouldmotivatethemtodeepentheircooperationwithChina,achampionoffreer,moreinclusivetradeandanimportanttradepartnerofAsia-Pacificeconomies.ThetradevolumebetweenChinaandAustralialastyearwas$107.8billion,almosttriplethatbetweenAustraliaandtheUS.TheChina-AustraliaFTA,whichcameintoeffectin2015-butwillbefullyfunctionalin2019-hastakenbilateraltradeandinvestmenttonewheights.AsbothsidesbegintoenjoythedividendsoftheFTA,theyshouldalsowelcometheideaofacceleratingtheconstructionofafreetradezone.Inkedin2008,theChina-NewZealandFTAwasthefirstFTAdealChinasignedwitha"Western"developednation.Ithasledtoanannualincreaseofatleast15percentinbilateraltrade,addingfreshmomentumtotheircomprehensivestrategicpartnership.AndChinaandNewZealandwillstarttalkstoupgradetheirfreetradeagreement,whichcoversservicetrade,e-commerceandagriculturalcooperation.ThetwocountriesonLi'sitinerarywerealsoveryimportantpointsonthe21stCenturyMaritimeSilkRoad,whichisonepartoftheChina-ledBeltandRoadInitiative.ThefocusoftheBeltandRoadInitiative,proposedbyPresidentXiJinpingin2013,isinfrastructure-basedconnectivity,whichhappenstobeinlinewiththedomesticambitionsofAustraliaandNewZealand.Canberraissuedaplanin2015fordevelopingNorthAustraliainthenexttwodecades,andlastyearitreleaseda15-yearplanforimprovinginfrastructurenationwide.Wellington's2015infrastructureplan,too,containslong-termgoalssuchasattractingmoreinvestmentandstreamliningmanagementandfeasibilityresearch.Inthiscontext,thetwocountrieshaveeveryreasontoparticipateintheBeltandRoadprogramsandworkcloselywithChina,whichhasarichexperienceofexecutinginfrastructureprojectsoverseas.SoLi'svisitisatimelyboostforthecountries'cooperationontheinitiative.TheauthorisaresearcherattheNationalInstituteofInternationalStrategyoftheChineseAcademyofSocialSciences.

从规范中PE管水平定向钻最大拖拉力的公式出发,按照最大拖拉应力不大于管材拉伸屈服应力的50%的原则,分析得出最大拖拉力不仅与管道公称直径、标准尺寸比有关,还与管材的拉伸屈服应力有关。PE管水平定向钻机实际产生的拖拉力不应大于按管材拉伸屈服应力的50%计算出的最大拖拉力。

 PE管水平定向钻最大拖拉力的探讨

从规范中PE管水平定向钻最大拖拉力的公式出发,按照最大拖拉应力不大于管材拉伸屈服应力的50%的原则,分析得出最大拖拉力不仅与管道公称直径、标准尺寸比有关,还与管材的拉伸屈服应力有关。PE管水平定向钻机实际产生的拖拉力不应大于按管材拉伸屈服应力的50%计算出的最大拖拉力。
《煤气与热力》2018年 第11期 | 朱林   北京市煤气热力工程设计院有限公司
PE管水平定向钻最大拖拉力的探讨.png
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