预应力管桩打入桩的施工质量控制与事故处理办法-本科毕VIP专享VIP免费

远程与继续教育学院毕业设计（论文）题目：预应力管桩打入桩的施工质量控制与事故处理办法指导教师：站点：上海行知学习中心学号：专业：年级：2011秋季姓名：2013年5月毕业设计（论文）诚信承诺书本人郑重承诺网络教育层次专业的毕业论文《》的主要观点和思想系本人独立思考完成，并在此申明我愿承担与上述承诺相违背的事实所引起的一切消极后果。签名：年月日预应力管桩打入桩的施工质量控制与事故处理办法InvestorRelationsManagementwithinChineseListedCompany摘要预应力混凝土管桩作为一种预制桩，与其它桩型相比，有桩身质量稳定可靠、强度高、穿透能力强、施工快捷方便、环境污染小等优点。预应力混凝土管桩的沉桩方式可分为打入法（锤击法）、静压法等，其中，打入式以其施工方便的有点广泛应用。本文分析了混凝土管桩预制过程中易出现的问题及各自对应的控制措施。混凝土强度不合格、端头板倾斜、桩身弯曲、环裂、纵裂、内壁混凝土坍落等问题，是预应力管桩生产过程中常出现的质量问题。针对各个问题，分析了如何应采取不同的预防措施和控制方法，以提高混凝土管桩生产质量。预应力混凝土管桩打入桩的施工工艺与其承载性能密切相关，管桩预制质量与管桩在施工现场的锤击下沉质量之间又有密切的关联，并且均影响管桩使用性能。本文在对预应力管桩打入桩施工工艺进行介绍的基础上，分析了管桩打入地基时容易出现的桩顶破碎、桩身断裂、桩身倾斜等质量问题及施工事故，并分析了各种施工事故产生的原因、预防措施和处理措施。关键词：预应力混凝土管桩打入桩质量控制事故处理AbstractInvestorRelationsManagement(IRM)isaninevitableresultofmarketeconomy.Itsfunctionhasbeenprovedbythepracticeofdevelopedcapitalmarket.ThispaperstartedwithdescribingthestatusquooftheIRMwithinChineselistedcompanies.Throughtheempiricalstudy,IfindthatthestatusquooftheIRMinChinaisverywicked,only12.5%companieshaveanInvestorRelationstitleontheirwebsites,42.0%companieshavedisclosedfinancialmaterialsontheirwebsites,whetheracompanyhasIRMisnotrelatedtoitslistingyears,registeredlocation,sizeandearnings.NowthefunctionsofIRMsuchasshorteningthetimeofrefinancing,decreasingthecostofrefinancing,stabilizingstockprice,havenotbeenshowninChineselistedcompanies.Finally,IanalyzethereasonofsuchphenomenonandmakeaproposalonhowtopromotethedevelopmentofIRMinChina.Keywords:InvestorRelationsManagement(IRM)ListedCompanyCapitalmarket目录摘要·······················································································IAbstract·················································································II1投资者关系管理的发展历程······················································11．1投资者关系管理在国际上的起源及发展·································11．2我国投资者关系管理的发展现状··········································22国内外对投资者关系管理的理论研究··········································52．1国外对投资者关系管理的理论研究·······································52．2国内对投资者关系管理的理论研究·······································73我国上市公司投资者关系管理现状的实证研究····························103．1研究方法································...