CECS 140-2011 给水排水工程埋地预应力混凝土管和预应力钢筒混凝土管管道结构设计规程
作者:标准资料网 时间:2024-05-16 13:04:01 浏览:9218
来源:标准资料网
基本信息
标准名称: | 给水排水工程埋地预应力混凝土管和预应力钢筒混凝土管管道结构设计规程 |
替代情况: | 替代CECS 140-2002;CECS 16-1990废止 |
发布部门: | 中国工程建设协会 |
发布日期: | |
实施日期: | 2012-01-01 |
首发日期: | |
作废日期: | |
起草单位: | 北京市市政工程设计研究总院 |
出版社: | 中国计划出版社 |
出版日期: | |
页数: | 85页 |
书号: | 1580177.734 |
适用范围
本规程适用于埋地敷设的预应力混凝土管和预应力钢筒混凝土管管道的结构设计。其埋设条件为素土平基、人工土孤基础及混凝土基础。
前言
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目录
1 总则
2 术语和符号
3 材料
4 管道结构上的作用
5 基本设计规定
6 管道结构计算
7 构造规定
附录
本规程用词说明
引用标准名录
附:条文说明
引用标准
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所属分类: 纺织 棉纺织 棉纱 线 纺织和皮革技术 纺织产品 纱线
【英文标准名称】:Informationtechnology-Uniqueidentificationoftransportunits-Part2:registrationprocedures.
【原文标准名称】:信息技术.传输装置的唯一标识.第2部分:注册过程
【标准号】:NFZ63-459-2-2004
【标准状态】:作废
【国别】:法国
【发布日期】:2004-04-01
【实施或试行日期】:2004-04-05
【发布单位】:法国标准化协会(FR-AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:识别;链路层;记录;数据传输;方法;信息技术;信息交换;电信;控制规程;数据收集;表;注册;传输装置;识别号;网络互连
【英文主题词】:Controlprocedures;Datacollection;Datatransmission;Identification;Identificationnumbers;Informationinterchange;Informationtechnology;Linklayers;Lists;Methods;Networkinterconnection;Records;Registration;Telecommunications;Transportationunits
【摘要】:
【中国标准分类号】:L71
【国际标准分类号】:35_040
【页数】:15P.;A4
【正文语种】:其他
【英文标准名称】:StandardPracticeforNaI(Tl)Gamma-RaySpectrometryofWater
【原文标准名称】:用NaI(TI)γ射线光谱法处理水的标准实施规程
【标准号】:ASTMD4962-2002(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2002
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D19.04
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:gammapulseheightanalysis;gammarayspectrometry;multichannelanalyzer;sodiumiodidedetector;Calibration--wateranalysisinstrumentation;Gammaradiation--water;Gamma-rayspectrometry;Multichannelanalyzer;Radioactivewateranalysis;Radionuclid
【摘要】:Gamma-rayspectrometryisusedtoidentifyradionuclidesandtomakequantitativemeasurements.Useofacomputerandalibraryofstandardspectrawillberequiredforquantitativeanalysisofcomplexmixturesofnuclides.Variationofthephysicalgeometryofthesampleanditsrelationshipwiththedetectorwillproducebothqualitativeandquantitativevariationsinthegamma-rayspectrum.Toadequatelyaccountforthesegeometryeffects,calibrationsaredesignedtoduplicateallconditionsincludingsource-to-detectordistance,sampleshapeandsize,andsamplematrixencounteredwhensamplesaremeasured.Thismeansthatacompletesetoflibrarystandardsmayberequiredforeachgeometryandsampletodetectordistancecombinationthatwillbeused.Sincesomespectrometrysystemsarecalibratedatmanydiscretedistancesfromthedetector,awiderangeofactivitylevelscanbemeasuredonthesamedetector.Forhigh-levelsamples,extremelylowefficiencygeometriesmaybeused.Quantitativemeasurementscanbemadeaccuratelyandpreciselywhenhighactivitylevelsamplesareplacedatdistancesof1mormorefromthedetector.Electronicproblems,suchaserroneousdeadtimecorrection,lossofresolution,andrandomsumming,maybeavoidedbykeepingthegrosscountratebelow2000countspersecondandalsokeepingthedeadtimeoftheanalyzerbelow5%.Totalcountingtimeisgovernedbytheactivityofthesample,thedetectorsourcedistance,andtheacceptablePoissoncountinguncertainty.1.1Thispracticecoversthemeasurementofradionuclidesinwaterbymeansofgamma-rayspectrometry.Itisapplicabletonuclidesemittinggamma-rayswithenergiesgreaterthan50keV.Fortypicalcountingsystemsandsampletypes,activitylevelsofabout40Bq(1080pCi)areeasilymeasuredandsensitivitiesofabout0.4Bq(11pCi)arefoundformanynuclides(1-10).Countratesinexcessof2000countspersecondshouldbeavoidedbecauseofelectroniclimitations.Highcountratesamplescanbeaccommodatedbydilutionorbyincreasingthesampletodetectordistance.1.2Thispracticecanbeusedforeitherquantitativeorrelativedeterminations.Intracerwork,theresultsmaybeexpressedbycomparisonwithaninitialconcentrationofagivennuclidewhichistakenas100%.Forradioassay,theresultsmaybeexpressedintermsofknownnuclidicstandardsfortheradionuclidesknowntobepresent.Inadditiontothequantitativemeasurementofgamma-rayactivity,gamma-rayspectrometrycanbeusedfortheidentificationofspecificgamma-rayemittersinamixtureofradionuclides.Generalinformationonradioactivityandthemeasurementofradiationhasbeenpublished(11and12).Informationonspecificapplicationofgamma-rayspectrometryisalsoavailableintheliterature(13-16).1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z16
【国际标准分类号】:13_060_30
【页数】:8P.;A4
【正文语种】:英语