安庆长江铁路大桥主墩基础围堰边锚改进

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1、桥梁建设2013年第43卷第1期(总第218期)104BridgeConstruction，Vo1．43，No．1，2013(TotallyNo．218)文章编号：1003—4722(2013)01—0104—06安庆长江铁路大桥主墩基础围堰边锚改进范学梅，农代培。(1．中铁大桥局第二工程有限公司，江苏南京210015；2．中铁大桥局安庆长江铁路大桥指挥部，安徽安庆246008)摘要：安庆长江铁路大桥主桥采用双塔多跨连续钢桁梁斜拉桥。该桥3号、4号主墩基础采用双壁钢围堰施．7-，围堰采用无导向船的重锚锚锭系统定

2、位。针对围堰接高过程中出现的部分边锚失效和大直径锚绳收放困难的问题进行原因分析及边锚改进。经分析，出现上述问题的主要原因为原边锚导缆器式马口设计存在缺陷(只能在锚绳共面情况下工作，在竖向外力作用下马口竖轴极难转动)，为此将原导缆器式马口更换为辊轴式马口，原围堰顶固定滑移式转向马口增设转轮装置，消除了边锚崩断失效安全隐患，解决了大直径锚绳难以收放的难题。关键词：铁路桥；桥梁施工；围堰定位；边锚失效；马口改进中图分类号：U448．13；U445文献标志码：AImprovementofSideAnchorsofCof

3、ferdamsforMainPierFoundationsofAnqingChangjiangRiverRailwayBridgeFANXue—mei．NONGDai—pei(1．The2ndEngineeringCo．，Ltd．，ChinaRailwayMajorBridgeEngineeringGroup，Nanjing210015，China；2．ConstructionHeadquartersofAnqingChangjiangRiverRailwayBridge，ChinaRailwayMajorBr

4、idgeEngineeringGroupCo．，Ltd．，Anqing246008，China)Abstract：ThemainbridgeofAnqingChangjiangRiverRailwayBridgeisadouble—pylonand’multi—spancontinuoussteeltrussgirdercable—stayedbridgeandthefoundationsforthemainpiersNo．3andNo．4ofthebridgewereconstructedbythedoubl

5、e—wallsteelcofferdamsthatwereposi—tionedbytheheavyanchoranchoragesystemswithoututilizingtheguidingbarges．Inthelightoftheproblemsthatpartofthesideanchorsofthecofferdamsfailedtoworkandthelargediametersteelanchorropesweredifficulttobereeledinandreeledoffinthepr

6、ocessofheightextendingofthecofferdams，thecausesleadingtotheproblemswereanalyzedandtheimprovementofthesideanchorswerecorrespondinglymade．Theresultsoftheanalysisshowedthatthemajorcauselead—ingtotheproblemswasthatthedesignoftheoriginalrope—guidedfairleadersfort

7、hesidean—chorshaddefect，i．e．theanchorropescouldworkonlyunderthecoplanarconditionoftheropesandundertheactionofvertica1externalforce。thevertica1rollersofthefairleadersrotatedverydifficultly．Therope—guidedfairleaderswerethuschangedintotherollerfairleaders，thest

8、eer—ingwheeldeviceswereaddedtotheslidingsteeringfairleadersoriginallyfixedatthetopsofthecofferdamsandconsequentlythesafetyhiddenperilthatthesideanchorsmightbebrokenandfailwaseliminatedandthediff