南京长江第四大桥南锚碇基础地下连续墙施工

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1、南京长江第四大桥南锚碇基础地下连续墙施工杨奉举，牛小龙77文章编号：1003—4722一(2010)06—0077—03南京长江第四大桥南锚碇基础地下连续墙施工杨奉举，牛小龙(中铁大桥勘测设计院有限公司，湖北武汉430050)摘要：南京长江第四大桥主桥为双塔三跨悬索桥，其南锚碇基础支护结构为“cx3”形地下连续墙，分工期、Ⅱ期2种槽段，槽段采用铣接法连接。施工前先进行地质水文详勘与封排水设计、地基加固、修筑导墙及试验槽段施工。按隔墙、北外墙、Y形槽段、南外墙顺序施工地下连续墙，先施工工期槽段，再施工Ⅱ期槽段。工期槽段采用三铣成槽，Ⅱ期槽段采用一铣成槽，Y形槽段采用五铣成槽。在外墙预埋钢

2、管进行墙底帷幕灌浆。基坑开挖前进行抽水试验，结果表明基坑日渗水量≤150m。；基坑开挖过程中，围护结构变形和周边土体的沉降均小于预警值，说明地下连续墙施5-．质量良好。关键词：南京长江第四大桥；悬索桥；基础；地下连续墙；帷幕灌浆；桥梁施工中图分类号：U448．25；U445．55文献标志码：AConstructionofUndergroundDiaphragmWallforSouthAnchorageFoundationofthe4thNanjingChangjiangRiverBridgeYANGFeng-jll，NIUXiao—long(ChinaRailwayMajorBridg

3、eReconnaissance8LDesignInstituteCo．，Itd．，Wuhan430050，China)Abstract：Themainbridgeofthe4thNanjingChangjiangRiverBridgeis3tWO—towerandthree—spansuspensionbridge．Thelaggingstructureforthesouthanchoragefoundationpitofthebridgeisofthe“∞”一shapeundergrounddiaphragmwallthathastwotypesofPhaseIandPhaseIIt

4、roughsectionsconnectedbythemillingconnectionmethod．Beforetheconstructionofthedia—phragmwallstarted，thedetailedsurveyofhydrologyandgeology，thedesignofwaterstoppageanddrainageandtheconstructionofgroundreinforcement，guidingwallsandtrialtroughsee—tionswerecarriedout．Thediaphragmwallwasthenconstructe

5、dinthesequenceoffirstlythePhaseItroughsectionandlatethePhaseIItroughsectionformthepartitionwallstOthenorthouterwalls，Y—shapetroughsectionandsouthouterwalls．ThePhaseItroughsectionwascom—pletedbythreetimesofmilling，thePhaseIItroughsectionbyonetimeofmillingwhiletheY—shapetroughsectionbyfivetimesofm

6、illing．ThesteelpipeswereembeddedintheouterwallstObeusedforcurtaingroutingtOthewallbases．Beforethefoundationpitwasexcavated，thewaterpumpingtestsweremadeanditwasknownfromtheteststhatthedailywaterseepinginthepitwas≤150m。．Intheprocessofthepitexcavation，thedeformationofthelaggingstructureandthesettle

7、mentofsoilaroundthepitwerealllessthantheprecautionvalues，showingthattheconstructionqualityofthediaphragmwallwasquitegood．Keywords：The4thNanjingChangjiangRiverBridge；suspensionbridge；foundation；un—dergrounddiaphragmwall；curta