资源描述：
《预压托换桩加固及顶升纠偏工程实践》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。
1、预压托换桩加固及顶升纠偏工程实践第24卷第l5期2005年8月岩石力学与工程ChineseJournalofRockMechanicsandEngineeringVb1.24NO.15Aug.,2005预压托换桩加固及顶升纠偏工程实践刘丽萍,李向阳一,王德伟4,燕菲(1.西安建筑科技大学土木工程学院,陕西西安710055;2.同济大学地下建筑与工程系,上海2000923.陕西建达疑难工程公司,陕西西安710055;4.陕西现代建筑设计研究院,陕西西安710048)摘要:西安市某住宅楼是在原3层砖混结构上增建至7层框架结构式房屋,两种结构体系没有完全脱离开,又
2、由于设计时地基处理不当,导致建筑物刚封顶即严重倾斜,倾斜率为18.6‰,沉降速率为9.15mm/d,随时存在倒塌的危险.为使房屋恢复正常使用,经研究后决定采用钢筋混凝土预压托换桩加固及顶升纠偏方案.以此工程为例,提出顶升纠偏中预压托换桩设计公式;详细介绍了纠偏方案的选定,钢筋混凝土预压托换桩顶升纠偏的设计方法,施工工艺,项升监测与控制以及顶升施工中的技术难点及采取的对策等.经过3d顶升施工后,使房屋的倾斜率稳定在0.530,沉降速率小于0.0077mm/d,房屋基本上恢复了正常使用.经过5a多使用证明,在黄土地区采用预压托换桩法加固或纠偏类似工程问题是可行的
3、.关键词.基础工程;顶升纠偏;预压托换桩;地基加固;工程实例中豳分类号:TU472.2文献标识码:A文章编号.1000—6915(2005)15—2795—07FoUNDATIoNREINFoRCEMENTANDBUILDINGRECTIFICATIoNoFDEVIATIoNBYJACK-UPANDPRELoADINGUNDERPINNINGPILELIULi—ping,LIXiang—yang2一,WANGDe—wei4,YANFei(1.InstituteofCivilEngineering,XianUniversityofArchitectureand
4、Technology,Xian710055,China;2.DepartmentofGeotechnicalengineering,TongjiUniversity,Shanghai200092,China;3.ShaanxiJiandaProblemProjectTreatingCompany,Xian710055,China:4.ShaanxiModernArchitectureDesignandResearchInstitute,Xian710048,China)Abstract:A3一storybrickconcretestructuralbuild
5、ingwasaddedto7一storyinXianCity,ShaanxiProvince:andthenew—addedpartisaframestructure.Becausetwodifferentstructuralsystemsarenotseparatedcompletelyandthedesigneradoptedunsuitablegroundtreatmentmethod,thebuildingbecameleaningseriouslywhenthemajorstructurewascompleted.Theinclinationrat
6、ioandsettlementrateofbuildingareupto18.6%0and9.15illnlperday,respectively;andthebuildingisboundtocollapse.Theschemeofrectifyingdeviationbyjack—upandbypreloadingunderpinningpilewasemployedafterinvestigationforsakeofsafety.Basedonthiscase,thefollowingaspectsaleinvestigated:theformula
7、todeterminethenumbersofunderpinningpilesforrectifyingleaningbuildingispresented;schemechoiceofrectifyingdeviation,designingmethod,constructionprocedureofpreloadingunderpinningpile,jackingmonitoringandcontrollingareintroducedinderail;difficultfactorsandcorrespondingproblemsduringjac
8、kingconstructionareprovide
