北江大桥引桥整体顶升施工技术

《北江大桥引桥整体顶升施工技术》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2014年第44卷第l期(总第224期)114BridgeConstruction。Vo1．44，No．1，2014(TotallyNo．224)文章编号：1003—4722(2O14)01—0114—07北江大桥引桥整体顶升施工技术陈舟，余晓琳，颜全胜，张志林，段中星。(1．华南理工大学土木与交通学院，广东广州510640；2．广东省长大公路工程有限公司，广东广州510640；3．广东罗阳高速公路有限公司，广东广州510102)摘要：北江大桥为多跨连续梁桥，由于佛开高速扩建，主桥需加高2．364m以满足通航要求，考虑整座桥的调坡影响，引桥需加高0．1

2、50～1．491m，经研究引桥采用PLC控制液压同步顶升系统进行整体顶升施工，并设计钢抱箍作为液压千斤顶顶升的承力平台。顶升前先进行辅助墩与边墩的处理和梁体解联；然后进行立柱加粗、安装钢抱箍、梁体切割、称重和试顶升；分5步对梁体进行正式顶升；最后对立柱进行接长、加粗和落梁，完成整个顶升施工过程。通过安装纵、横向限位装置保证了顶升施工质量和梁体安全。施工中对顶升过程进行全程监控，及时调整了顶升过程的偏差，监控结果表明顶升施工质量良好。关键词：北江大桥；连续梁桥；钢抱箍；同步整体顶升施工；施工监控；桥梁维修中图分类号：U445．4；U445．6文献标志码：ACon

3、structionTechniquesforIntegralJacking-upofApproachBridgeofBeijiangRiverBridgeCHENZhou，yUXiao—lin，YANQuan—sheng，ZHANGZhi—lin。．DUANZhong—xing。(1．SchoolofCivilEngineeringandTransportation，SouthChinaUniversityofTechnology，Guangzhou510640，China；2．GuangdongChangdaHighwayEngineeringCo．，Ltd

4、．。Guangzhou510640，China；3．GuangdongLuoyangExpresswayCo．，Itd．，Guangzhou510102，China)Abstract：TheBeijiangRiverBridgeisamulti—spancontinuousgirderbridge．Themainbridgeofthebridgeneededtoberaised2．364mowingtotheexpansionofFoshanKaipingEx—presswayandinordertocaterforthenewnavigationrequir

5、ementunderthebridge．Atthesametime，consideringthegradientadjustmentofthewholebridge，theapproachbridgeofthebridgeneededtobeintegrallyraised0．15O～1．49lm．Afterstudy，itwasdeterminedthatthePLC—controlledsynchronoushydraulicjacking—upsystemwouldbeusedfortheconstructionoftheintegraljacking—

6、upoftheapproachbridgeandthesteelgirdleswereaccordinglydesignedtoserveastheplatformsforsupportingthehydraulicjacks．Beforetheconstructionstarted，theauxiliarypiersandsidepierswerefirstlyhandledandthemaingirderandpiersweredisconnected．Thepiercolumnswerethenthickenedandthesteelgirdleswer

7、einstalled．Thepartofthegirderwascutoff，thegirderwasweighed，thetrialjacking—upwascarriedoutandthegirderwasactuallyformallyjackedupin5steps．Finallytheheightofthepiercolumnswasextended，thecolumnswerethickened，thegirderoverthecolumnswasjackeddowntothepiertopsandthewholeconstructionofthe

8、jacking—upwascomple