桥梁两支点转体施工技术的可行性研究
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摘要
武汉市常青路改造跨铁路桥采用(95+105)m连续钢箱梁桥跨越,受施工场地限制采用不对称转体法施工。球铰支点长臂端梁长91.4 m,短臂端梁长43.8 m,两端重量差3 000 t,不能单靠配重来平衡转体不平衡力矩。经研究并结合有限元分析计算,提出两支点转体的方案:在短臂端配重2 644 t,同时在长臂端距离转体球铰中心23.6 m处增设一个支点,通过增设支点与配重共同作用,使转体两端达到平衡状态;同时依靠增设支点上的动力系统带动钢箱梁水平转体至设计位置。为论证该转体方法的可行性,按桥梁实体尺寸的1/5制作转体桥和转体系统模型,通过收集和分析模型转体过程中的参数得出结论。本文主要介绍极不对称两支点转体系统模型试验研究技术,重点在于模型的设计和转体数据的监控与分析,从而得出两支点转体施工技术可行的结论。
The(95 + 105)m continuous steel box girder bridge is adopted for reconstructing the railway bridge across Changqing Road in Wuhan,and the asymmetric swing method is applied due to the restricted site.The beam length at the long arm end of the spherical hinge fulcrum is 91.4 m and the short one is 43.8 m.The weight difference between the two ends is 3 000 t,so the unbalanced moment cannot be balanced solely by the counterweight.Combining with finite element analysis and calculation,a scheme of two pivots rotation is proposed:weighing 2 644 t at the end of short arm,and adding a pivot at the long arm end,which is 23.6 m away from the center of the rotary spherical hinge.With the function of weighting and adding the pivot,the two ends of the turning body can reach an equilibrium state.At the same time,the horizontal turning of the steel box girder is driven to the design position by the power system with the additional pivot.In order to prove the feasibility of the method,the model of the swivel bridge and the swivel system is made according to 1/5 of the size of the bridge entity,and the conclusion is drawn by collecting and analyzing the parameters in the swivel process of the model.The author mainly introduces the technologies from studying the model test for extremely asymmetric two-pivot rotating body system,focusing on the design of the model and the monitoring and analysis of the rotating body data,so as to draw a conclusion that the two-pivot rotating body construction technology is feasible.
The(95 + 105)m continuous steel box girder bridge is adopted for reconstructing the railway bridge across Changqing Road in Wuhan,and the asymmetric swing method is applied due to the restricted site.The beam length at the long arm end of the spherical hinge fulcrum is 91.4 m and the short one is 43.8 m.The weight difference between the two ends is 3 000 t,so the unbalanced moment cannot be balanced solely by the counterweight.Combining with finite element analysis and calculation,a scheme of two pivots rotation is proposed:weighing 2 644 t at the end of short arm,and adding a pivot at the long arm end,which is 23.6 m away from the center of the rotary spherical hinge.With the function of weighting and adding the pivot,the two ends of the turning body can reach an equilibrium state.At the same time,the horizontal turning of the steel box girder is driven to the design position by the power system with the additional pivot.In order to prove the feasibility of the method,the model of the swivel bridge and the swivel system is made according to 1/5 of the size of the bridge entity,and the conclusion is drawn by collecting and analyzing the parameters in the swivel process of the model.The author mainly introduces the technologies from studying the model test for extremely asymmetric two-pivot rotating body system,focusing on the design of the model and the monitoring and analysis of the rotating body data,so as to draw a conclusion that the two-pivot rotating body construction technology is feasible.
引文
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[2]井江永.(50+85+50)m跨铁路连续梁不对称转体设计研究[J].铁道标准设计,2018(9):67-71.
[3]赵凯兵.基于极不平衡条件下钢箱梁桥转体施工的研究[J].铁道建筑技术,2018(8):60-63.
[4]中华人民共和国国家铁路局.铁路桥梁钢结构设计规范:TB 10091-2017[S].北京:中国铁道出版社,2017:5-21.
[5]唐清明.大跨度超宽变截面不平衡配重连续梁转体施工控制[J].施工技术,2017(5):66-69.
[6]邱志军,陈才.大跨径一墩双T不平衡配重连续梁的转体施工[J].筑路机械与施工机械化,2018,35(5):80-87.
[7]宋满荣,柳炳康,杨玉龙,等.跨大秦铁路大桥转体称重试验及配重研究[J].世界桥梁,2015,43(6):63-67.
[8]聂海丰.大跨径曲线连续梁水平转体施工及监控技术研究[D].长沙:中南林业科技大学,2018:60-65.
[9]薄涛.即墨上行联络线跨线连续梁桥转体施工监控技术研究[D].哈尔滨:哈尔滨工业大学,2016:47-51.
[10]王东.跨胶济客专铁路连续梁转体设计及施工控制分析[D].石家庄:石家庄铁道大学,2017:21-22.
[11]吕前贺.箱形连续梁桥转体施工监控与局部受力研究[D].兰州:兰州交通大学,2017:23-25.
[12]王海军.小曲线半径不对称钢箱梁桥偏心转体施工技术[D].西安:西安建筑科技大学,2018:71-74.