几种常用的建筑给排水管材有关知识简介

ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccidentfournoprinciple.Imposedonproductionsafetyaccidentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthewhoisinchargeofwho'sinchargeandhosemustbesafeprinciplesinplanning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishingsafetyistheeffectiveness,safetyisthecredibility,safetyisthecompetitivenessawareness,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan培养学生的阅读习惯，通过阅读欣赏短文，引导学生感悟大自然的美，激发热爱家乡的感情。语文生活，让学生认识到生活中处处有语文，学习语文应走出课堂，在生活中自主地认字。通过口语交际，培养学生交流的兴趣和交际能力。常用的建筑给排水管材一、室外给水管材（一）、金属管1、钢管钢管分为焊接钢管和无缝钢管。焊接钢管分为螺旋缝焊和直焊钢管，螺旋缝焊钢管分为自动埋弧焊接钢管和高频焊接钢管，直焊钢管又分为普通直焊钢管和不锈焊接钢管。无缝钢管按制造方法分为热轧管和冷轧(拔)管，其精度分为普通和高级两种。冷轧(拔)管的最大公称直径为200mm，热轧管最大公称直径为600mm。无缝钢管还有不锈钢无缝钢管，不锈钢无缝钢管分为热轧、热挤压不锈钢无缝钢管和冷轧(拔)不锈钢无缝钢管两种。钢管按防腐蚀性能分为保护层型、无保护层型。保护层型分为金属保护层型与非金属保护层型两种。金属保护层型常用的有表面镀层保护层型、表面压合保护层型。表面镀层保护层型中常见的是镀锌管，镀锌管也有冷镀锌管和热镀锌管，热镀锌管因为保护层致密均匀、附着力强、稳定性比较好。非金属保护层型主要是钢塑复合管，根据钢塑复合管所依附的钢管基本材料不同又分为涂(衬)塑焊接钢管和涂(衬)塑无缝钢管。给水涂塑复合管主要有聚乙烯(PE)钢塑复合管；给水衬塑复合管主要有聚乙烯(PE)、硬聚氯乙烯(PVC－U)、交联聚乙烯(PEX)、氯化聚氯乙烯(CPVC)和聚丙烯(PP)钢塑复合管。生产厂家从管道连接方式和配件的不同将钢塑复合管分为法兰式、沟槽式ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccidentfournoprinciple.Imposedonproductionsafetyaccidentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthewhoisinchargeofwho'sinchargeandhosemustbesafeprinciplesinplanning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishingsafetyistheeffectiveness,safetyisthecredibility,safetyisthecompetitivenessawareness,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsafety.PersonaldeathandaTradeUnionhastherighttoparticipateinthemajoraccidentinvestigations,relyonthemassestodoproductionsafetywork.Eighthpitmustbebasedonrelevantlawsandregulations,industrystandardsandcompanyandGod'sstandards,rulesandregulationsissuedbythecompany,developingrulesandregulationsforcoalproduction,institutionalizationan培养学生的阅读习惯，通过阅读欣赏短文，引导学生感悟大自然的美，激发热爱家乡的感情。语文生活，让学生认识到生活中处处有语文，学习语文应走出课堂，在生活中自主地认字。通过口语交际，培养学生交流的兴趣和交际能力。和螺纹式三种，按涂(衬)层耐热性分为热水用钢塑复合管与普通性或冷水用钢塑复合管。钢塑复合管是一种比较好的防腐管材。钢管优点：耐压强度高，接头方便且数量少，长度少，内表面光滑水力条件好等。缺点：耐腐蚀性差，造价高。连接方法有焊接、法兰连接，小口径管可用螺纹连接。2、给水铸铁管给水铸铁管能承受较大工作压力(0．45～1．00MPa)、耐腐蚀、价格便宜，管内壁涂沥青后较光滑，因而被大量用于外部给水管上。但是它的缺点是质硬而脆、重量大、施工困难。公称直径从DN75～DNl500，工作压力有0．45、0．75、1．00MPa等几种。铸铁管的接头通常有承插式、法兰式和柔性接口三种。给水铸铁管按制造材质不同分为给水灰口铸铁管和给水球墨铸铁管两种。常用的给水球墨铸铁管具有强度高、韧性大、密闭性能佳、抗腐蚀能力强、安装施工方便等优点。按接口方式不同分为K型机械式柔性接口管和T型承插式柔性接口管。连接方式：承插式、法兰式。（二）、非金属管材1、钢筋混凝土管钢筋混凝土管有普通的钢筋混凝土管(RCP)、自应力钢筋混凝土管(SPCP)、预应力钢筋混凝土管(PCP)和预应力钢筒钢筋混凝土管(PCCP)。它们共同的特点是：节省钢材，价格低廉(和金属管材相比)，ndoverallleadershipresponsibilityforsafety.AdministrativeDeputyiswithinthescopeoftheirrespectiveresponsibilitiesatvariouslevelsofsecurityresponsibility,inchargeofsecurityworkinthecontextofleadership,responsibletotheChief.Fifthopenpitproductionsafetyaccidentinvestigationsystem,performedonaproductionsafetyaccidentfournoprinciple.Imposedonproductionsafetyaccidentreportstepbystepreportingthreechannels,namely,UnitChief,administrationandsafetysupervisionsystemcounterparttosuperiorleadership,reportsinatimelymanner.Sixthpitmustimplementthewhoisinchargeofwho'sinchargeandhosemustbesafeprinciplesinplanning,layout,checkproductionwork,summarizedandevaluatedatthesametime,plans,features,review,summary,ratingsafetywork.Firmlyestablishingsafetyistheeffectiveness,safetyisthecredibility,safetyisthecompetitivenessawareness,tomakesafetywork.Seventhminingtradeunionorganizationaccordingtolawtheworkerstoparticipateintheworksafetyofdemocraticmanagementanddemocraticsupervision,safeguardworkers'legitimaterightsandinterestsinrespectofsaf