Control Technology In Assembling ConstructionandIncremental Launching Of Basket Handle Arch Fuyuan Road Xiangjiang River Bridge In Changsha City

Fuyuan Road bridge in Changsha is a three-span continuous basket handle beam-archcomposite arch bridge, which adopted the construction technique of assembling on shorespan-by-span and overall incremental launching into place.At present,Jiubao bridge in Hang-zhou is the only one bridge,that the long-span continuous beam-arch composite arch bridgewhich adopted the overall incremental launching construction.Data can be used for referenceis limited.In order to ensure that assembling construction and overall incrementallaunchingconstruction can be done smoothly,it was important to simulate the process of overall incrme-ntal launching construction and control the alignment in assembling construction. Backgroun-ded by the construction process of Fuyuan Road bridge, this paper made a preliminary resear-ch and analysis on alignment control in assembling construction, the finite element simulatingcalculation of and stress monitoring in overall incremental launching construction. The paperis divided into three parts:(1) The paper discussed the design features, the method of assembly segment dividedand alignment control. The measuring points of the alignment control were reasonably chosedand determined the process of alignment control under relevant information. Then, the paperdescribed the calculation menthod of the assembly coordinates of the measuring points ofmain arch andlongitudinal beam segments of the main bridge detailedly, and the alignmenthad been controlled according to the assembly coordinates.The comparative recults of theoret-ical values and measured values of the measuring points verified that the alignment controlhad good applicability, and the control achieved a good results.(2)The paper introducedthe program and principle of the overall incremental launchingconstruction of the main bridge. According to the design information of the main bridge, thefinite element software Ansys was used to establish finite element model of the main bridgeand simulate the process of overall incremental launching construction. For research andanalysis on the calculation results, the location and the construction status of the maximumstress were found. It verified that the main bridge has a good security in theory, and can proci-de theoretical support for the stress monitoring in overall incremental launching construction.(3)The paper introduced strain sensor, strain automatically collection system and wireless read data method. The measuring points of the critical sections were reasonablychose under the stress simulation results, and then the stress had been monitored in overalllaunching construction. Because the third span of the main bridge was not completed, the pap-er only introduced the results of stress monitoring in the first and the second overall increme-ntal launching construction. For research and analysis on the results of stress monitoring, thevarying laws of stress was analyzed. The comparative recults of theoretical values andmeasured values of the measuring points verified that the finite element model had goodapplicability. The results of ths paper can benefit for the similar projects in the future.