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1、第31卷第9期岩土力学Vol.31No.92010年9月RockandSoilMechanicsSep.2010文章编号：1000－7598(2010)09－2919－06浙江某高层预应力管桩偏位和上浮处理实例分析1,21,21,21,2,31,2张忠苗，张乾青，贺静漪，俞峰，刘俊伟（1.浙江大学软弱土与环境土工教育部重点实验室，杭州310058；2.浙江大学岩土工程研究所，杭州310058；3.浙江理工大学建筑工程学院，杭州310018）摘要：结合工程实例分析了预应力管桩产生偏位的原因，介绍了偏位预应力管桩的处理方法。首先测量每根管桩的桩顶偏位和上浮情况，然后对所有管桩进行低应变动测，确
2、定桩身损伤情况及缺陷部位，最后根据管桩偏位和损伤情况采取有针对性的处理措施。工程中对上浮桩采用复打复压处理；对严重偏位且断裂桩进行补预应力管桩处理；对偏位超过规范值但桩身质量完好的桩进行纠偏扶正处理；对偏位较大且桩身有损伤的桩进行先纠偏扶正，并在管桩内芯放钢筋笼灌芯加固处理；对群桩大面积偏位损伤部分由于处理后承载力达不到设计要求需要采用补桩处理。建筑物经上述处理后的实测最大沉降仅为9mm，且沉降较为均匀。关键词：预应力管桩；偏位；上浮；纠偏；灌芯；沉降中图分类号：TU473文献标识码：AExampleanalysisofslopingandfloatingupwardprestressed
3、pipepilewithtreatmentofahigh-risebuildinginZhejiangprovince1,21,21,21,2,31,2ZHANGZhong-miao，ZHANGQian-qing，HEJing-yi，YUFeng，LIUJun-wei(1.MOEKeyLaboratoryofSoftSoilsandGeoenvironmentalEngineering,ZhejiangUniversity,Hangzhou310058,China;2.InstituteofGeotechnicalEngineering,ZhejiangUniversity,Hangzho
4、u310058,China;3.SchoolofCivilEngineeringandArchitecture,ZhejiangUniversityofScienceandTechnology,Hangzhou310018,China）Abstract:Basedonanengineeringexample,thereasonoftheslopingprestressedpipepile(PPP)andthetreatmentmethodfortheslopingPPPweregiven.Firstofall,theslopingconditionofeachpileshouldbemad
5、eclearly,thenthedamagedpositionofeverypileisclarifiedwithlowstraindynamictest;andatlastthepertinencetreatmentmeasuresarebroughtforward.Itcanbeconcludedthatforthepileswithpileshaftsfloatingupward,theycanbere-pressed;forthepileswithseriouspiletopslopesandruptureofthepileshafts,theymustbereplacedbybo
6、redpiles;forthepileswithsmallerpiletopslopesandsoundnessofthepileshafts,theycanbedirectlyusedafterrectificationandrighting;forthepileswithbiggerpiletopslopesanddefectofthepileshafts,thefirststepisrectificationandrighting;andthenstrengtheningthepileshaftsbyplacingreinforcementcageandpouringconcrete
7、inthecoresofthepiles;andforthetreatedpileswithlowerbearingcapacity,thebearingcapacityofthebearingplatformshouldbestrengthenedbyaddingboredpiles.Themeasuredsettlementofbuildingissmallanduniform,andthemaximumsettle
