港珠澳大桥浅水区非通航孔桥埋置式承台止水方案比选.pdf

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1、桥梁建设２０１７年第４７卷第６期（总第２４７期）BridgeConstruction，Vol．４７，No．６，２０１７（TotallyNo．２４７）１１７文章编号：１００３－４７２２（２０１７）０６－０１１７－０６港珠澳大桥浅水区非通航孔桥埋置式承台止水方案比选孙国光（中铁大桥局集团第五工程有限公司，江西九江３３２００１）摘要：港珠澳大桥浅水区非通航孔桥为跨径８５m的钢－混组合连续梁桥，采用埋置式承台结构，承台和底节墩身采用预制安装工艺施工。为了完成埋置式承台的水下安装，保证现浇混凝土施工质量，提出了３种止水方案：整体式柔性止水（方案１）、分离式托盘胶囊止水（方案２）

2、以及无内置双壁锁口钢套箱围堰止水（方案３），通过对３种方案的综合对比分析，采用方案３。该方案中围堰采用双壁结构，平面分８块，通过榫头式锁口连接成整体，围堰拼装成型后整体下放至设计标高，然后进行吸泥、封底、锁口封堵、抽水、承台安装、绑扎钢筋、浇筑混凝土等工序施工，最后利用涨落潮整体拆除围堰。实践证明，方案３止水效果好，更能保证混凝土施工质量，确保桥梁设计使用寿命。关键词：跨海大桥；连续梁桥；埋置式承台；双壁锁口钢围堰；止水方案比选；桥梁施工中图分类号：U４４８．２１５；U４４５．５５文献标志码：ASelectionofWaterStoppageSchemeforEmbe

3、ddedPileCapsofNon-NavigableSpanBridgeofHongKong-Zhuahai-MacaoBridgeoverShallowWaterAreaSUNGuoguang-（The５thEngineeringCo．，Ltd．，ChinaRailwayMajorBridgeEngineeringGroup，Jiujiang３３２００１，China）Abstract：Thenon-navigablespanbridgeoftheHongKong-Zhuahai-MacaoBridgeovertheshallowwaterareaisthe８５-m

4、spansteelandconcretecontinuouscompositegirderbridge．Thepilecapsofthefoundationsforthebridgearetheembeddedpilecapsandthepilecapsandthefirsttierpiershaftsareallconstructed，usingtheprecastingandfieldinstallationmethod．Tofulfilltheinstallationofthepilecapsunderthewaterandensuretheconstructi

5、onqualityofthepartofthecast-in-situconcreteforthepilecaps，３waterstoppageschemesforthepilecaps，includingthein-tegralflexiblewaterstoppagescheme（scheme１），theseparatedtraycapsuleswaterstoppagescheme（scheme２）andthelockeddouble-wallsteelboxedcofferdamwithnointernalbracings（scheme３），wereputfo

6、rward．Throughthecomprehensivecomparisonandanalysisofthe３schemes，thescheme３wasselected．Intheselectedscheme，thecofferdamwasthedouble-wallstructurethatwasdividedinto８segmentsinplanandwasassembledintoanintegrity，usingthetenonlocks．Afterthecofferdamwasassembled，itwasintegrallylowereddowntoth

7、erequiredel-evationinthesea．Theconstructionofthemudairlifting，basesealing，locksealing，waterpum-ping-out，pilecapinstallation，reinforcementbindingandtheconcretecastinginsidethecofferdamwasthencarriedoutandfinally，aftertheconstructionofafoundationwasfulfilled，thecofferdamwasremove