波形钢腹板组合梁桥异步浇筑线形计算及工作面长度分析OA

As an efficient construction method for composite beam bridges with corrugated steel webs(CSWs),the asynchronous pouring method with multiple working faces has been widely promoted and applied in multiple domestic engineering projects.Based on the asynchronous working faces at the roof plate of N-1 section,bottom plate of N-section,and CSWs of N+1 section during the construction process,the influence of length parameters of each work-ing face on the construction linear was studied.Firstly,a simplified linear calculation method was proposed.And a finite element model of an engineering example was established by deriving a deformation prediction formula for the cantilever front end.Subsequently,combined with on-site monitoring data,the calculation formula was verified to be correct;Secondly,the influence of the combination of pouring lengths with 3.2,4.8,and 6.4 m for the working face of the N-section bottom plate and N-1 section top plate on the construction alignment were analyzed.According to the adjustable range of the linear of CSWs,the applicable length for the lifting of the working face of the N+1 sec-tion was determined.The analysis results indicate that the proposed linear simplification calculation method can ef-fectively predict the stage deformation within asynchronous cycles;For achieving the target linear of the bridge completion,the stage deformation value of the 3.2 m short pouring working face group is significantly smaller than that of the 6.4 m long pouring working face group,which has higher controllability,but it will correspondingly pro-long the asynchronous construction period and increase construction costs;The lifting working face is set to expand the length of the lifting section of the corrugated steel web plate,which is affected by the adjustable range.In the example,No.sections 2～6 can extend the lifting working face during asynchronous cycles.