武汉二七长江大桥桥塔索道管精密定位方法

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1、桥梁建设2012年第42卷第1期(总第211期)14BridgeConstruction，Vo1．42，No．1，2012(TotallyNo．211)文章编号：1003—4722(2012)01—0014—05武汉二七长江大桥桥塔索道管精密定位方法兰其平，程海琴。(1．中铁大桥局集团第五工程有限公司测绘中心，江西九江332001；2．华东交通大学土木建筑学院，江西南昌330013)摘要：为保证武汉二七长江大桥(斜拉桥)施工时索塔的几何形状及空间位置符合设计规范要求，通过布设精密测量施工控制网、构建三维坐标数学模型完成塔柱索道管定位。步骤如下：在岸上布设3个强制观测墩，和全

2、桥控制网组成高精度加密控制网；在岸上的劲性骨架上安装索道管定位架、焊接索道管调整装置后，整体吊装并调整劲性骨架的位置，完成岸上初定位；在塔柱劲性骨架上设置控制点，建立独立坐标系进行索道管高精度定位测量。精度分析表明，该方法对索道管定位的测量精度完全满足±5mm设计的要求。关键词：斜拉桥；桥塔；桥梁施工；精密；控制测量；精度中图分类号：U448．27；U445．4文献标志码：AMethodforPrecisePositioningofCableDuctsinPylonofWuhanErqiChangjiangRiverBridgeLANQi—ping．CHENGHai—qin

3、(1ISurveyingandMappingCenter，the5thEngineeringCo．，Ltd．，ChinaRailwayMajorBridgeEngineeringGroup，Jiujiang332001，China；2．SchoolofCivilEngineeringandArchitecture，EastChinaJiaotongUniversity，Nanehang330013，China)Abstract：ToensurethatthegeometricshapeandspatialpositionofthepylonofWuhanErqiChangj

4、iangRiverBridge(acable—stayedbridge)couldaccordwiththeirdesignandcoderequire—mentsintheconstructionprocess，thecableductsinthepyloncolumnswerepositionedbythemethodofsettinguptheprecisesurveyconstructioncontrolnetworkandthethree—dimensionalcoordinatemathematicmode1．Theproceduresoftheposition

5、ingoftheductswerespecificallyasfollows：threeforcedobservationpillarswerefirstlysetonthebanksandtogetherwiththecon—trolnetworkforthewholebridge，thepillarswouldformahighlyprecisedensifiedcontrolnet—work．Onthesteelframeskeletononthebank，thepositioningframesforthecableductswereinstalled．Aftert

6、heductswereweldedandthepositionsoftheductswerewelladjusted，thewholeskeletonwaslifted，thepositionoftheskeletonwasadjustedandthepreliminarypositio—ningoftheductsonthebankwasthuscompleted．Thenthecontrolpointsweresetontheskele—toninthepylon，theindependentcoordinatesystemwassetuptocontinuethepr

7、ecisesurveyofthepositioningoftheducts．Theanalysisofthesurveyprecisionshowedthatthepositioningpre—cisionoftheductsbythemethodcouldcompletelysatisfythedesignrequirementof+5mm．Keywords：cable—stayedbridge；pylon；bridgeconstruction；precise；controlsurvey；preci—S1On收稿