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  

Linear Calculation and Analysis of Working Face Length of Composite Beam Bridge with Corrugated Steel Webs by Asynchronous-Pouring-Construction Technology

作　　者：马亚仲 Ma Yazhong(BUCC Infrastructure Construction Co.,Ltd.,Beijing 101200,China)

机构地区：[1]北京住总基础设施建设集团有限公司,北京101200

出　　处：《市政技术》2024年第8期38-47,111,共11页Journal of Municipal Technology

摘　　要：多工作面异步浇筑法作为波形钢腹板组合梁桥的一种高效建造方法,得到了国内多个工程项目的推广应用。基于施工过程中N-1节段顶板、N节段底板、N+1节段波形钢腹板形成的异步工作面,研究了每个工作面的长度参数对施工线形的影响。首先,提出线形简化计算方法,通过推导悬臂前端变形预测公式,建立了工程实例的有限元模型,随后结合现场监测数据,验证了计算公式的正确性;其次,分析N节段底板、N-1节段顶板的工作面浇筑长度分别为3.2、4.8、6.4 m组合时对施工线形的影响,根据波形钢腹板线形可调范围,确定了N+1节段波形钢腹板工作面吊设的适用长度。分析结果表明:提出的线形简化计算方法可以有效预测异步周期内的阶段变形量;以成桥目标线形为目标,3.2 m短浇筑工作面组的阶段变形值明显小于6.4 m长浇筑工作面组,其可控性更高,但会相应延长异步施工周期、增加施工成本;吊设工作面设置为对波形钢腹板吊装节段长度的扩充,受到相邻腹板可调范围的影响,实例中的2~6号节段在异步周期内可延长吊设工作面。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 Nsection,and CSWs of N+1 section during the construction process,the influence of length parameters of each working 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 section was determined.The analysis results indicate that the proposed linear simplification calculation method can effectively 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 prolong 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.

关 键 词：组合梁 波形钢腹板 异步浇筑 工作面长度 实桥分析 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]