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ID:5367753
大小:1.11 MB
页数:6页
时间:2017-12-08
《某桥桥墩桩基偏位纠偏方案设计与实施》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2015年第45卷第1期(总第230期)BridgeConstruction,Vo1.45,No.1,2015(TotallyNo.230)97文章编号:1003—4722(2015)01—0097—06某桥桥墩桩基偏位纠偏方案设计与实施侍刚,伍贤智。(1.中铁大桥局集团桥科院有限公司,湖北武汉430034;2.桥梁结构安全与健康湖北省重点实验室,湖北武汉430034)摘要:某四跨25m预应力空心板简支梁桥桥墩桩基严重偏位,桩顶最大偏移量为19.1cm。经分析,该桥桥墩桩基偏位的原因为在堆土不平均土压力作用下,淤泥层发
2、生显著的侧向挤出现象,从而产生巨大的侧向推挤作用,使右幅桥墩产生偏移。结合现场实际情况,采取设置应力释放孔、高压旋喷桩,新增桩基承台及顶推纠偏等措施进行纠偏整治,使桥墩偏位回归允许范围内。采用荷载试验对加固后桥墩的承载能力进行评定,结果表明,桥墩承栽能力满足设计要求,所采取的方案有效,纠偏效果良好。关键词:简支梁桥;桥墩偏位;纠偏方案;应力释放孔;高压旋喷桩;荷栽试验中图分类号:U443.22;U445.71文献标志码:ADesignandImplementationofDeviationRectifyingSchemefor
3、PileFoundationsofPiersofaBridgeSHIGang.WUXian-zhi’(1.BridgeScien、caResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034,China;2.KeyIaboratoryofBridgeStructureSafetyandHealthofHubeiProvince,Wuhan430034,China)Abstract:Thepilefoundationsforthepiers
4、ofa4×25一mspanprestressedconcretesimply—supportedhollowslabbeambridgedeviatedseverelyandthemaximumdeviationamountofthepiletopswasupto19.1cm.Throughtheanalysisofthedeviationsofthepilefoundations,itwasconsideredthatthecausesofthedeviationslayinthefollowing:undertheacti
5、onofthenon—uniformstackedsoilpressure,theproblemofsignificantlateralcompactionofthesiltlayersinthegroundoccurred,theproblemproducedenormouslateralpushingactionandconsequentlycausedthepiersoftherightpartofthebridgetodeviate.Inthelightoftheactualsitecondi—tions,themea
6、suresofarrangingthestressreleasingholesandhighpressurejetgroutingpiles,addingthenewpilecapsandrectifyingthedeviationsbypushingweretakentohandlethedevia—tionsofthepilefoundationsandtorestorethedeviationsofthepierstotheallowablerange.Thebearingcapacityofthehandledpier
7、swasassessedbytheloadtestsandtheresultsshowedthatthatthebearingcapacityofthepierscouldmeetthedesignrequirements,thedeviationrectifyingschemepreparedforthepilefoundationsandpierswaseffectiveandtheeffectofthedeviationrectifyingwassound.Keywords:simply—supportedbeambri
8、dge;pierdeviation;deviationrectifyingscheme;stressreleasinghole;highpressurejetgroutingpile;loadtest1引言的建筑垃圾,有些单位直接将建筑垃圾堆于桥底。由于我国城市建设的高速发展
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