跨既有线钢桁梁桥横移施工过程临时结构分析及监控
|
摘要
西成客专跨西宝客专特大桥1～132 m钢桁梁桥,跨福银高速与西宝客运专线,采用对既有线行车影响小的横移施工方案。为保证横移施工时各临时结构的安全性,利用有限元法建立滑道梁下钢管临时墩、滑道梁力学模型,对横移施工全过程进行了理论分析。依据理论计算结果对不满足局部稳定性要求的钢管临时墩提出并采用钢板及工字钢自上而下间隔焊接一周的加固方案。同时对临时结构布设应力测点48个、位移测点26个,进行钢桁梁体系转换完成后、横移前及横移阶段应力和位移实时监测。测得各临时结构应力实测值与理论值在6%范围内波动,滑道梁中跨跨中实测动位移均小于理论计算值1～2 mm。结果表明:各临时构件实测值变化趋势始终与理论值相一致,均在受控范围内。
Xichengke special cross-Xibaoke special bridge 1-132 m steel truss bridge, cross Fuyin highway and Xibao Passenger Line, was carried out with transerverse shift construction with little effect on existing lines. For keep every temporary structure safety during the work, use finite element method to build mechanical model of temporary pier and slide beam of steel tube under slide beam to conduct theoretical analysis for the whole process. According to the calculated results, for the temporary piers of steel pipes that do not meet the requirements of local stability, the reinforcement scheme of steel plates and I-beams welded from top to bottom for one week is proposed. At the same time, 48 temporary stress points and 26 displacement measuring points are arranged on the temporary structure. After the conversion of the steel truss system, monitor stress and displacement before shift and during shifting process. The measured value of temporary structure stress is under 6%, the measured shifting displacement of slide beam midspan is 1-2 mm less than the theoretical value. The result shows that The measured value of each temporary component is always consistent with the theoretical value, and both are within the controlled range.
Xichengke special cross-Xibaoke special bridge 1-132 m steel truss bridge, cross Fuyin highway and Xibao Passenger Line, was carried out with transerverse shift construction with little effect on existing lines. For keep every temporary structure safety during the work, use finite element method to build mechanical model of temporary pier and slide beam of steel tube under slide beam to conduct theoretical analysis for the whole process. According to the calculated results, for the temporary piers of steel pipes that do not meet the requirements of local stability, the reinforcement scheme of steel plates and I-beams welded from top to bottom for one week is proposed. At the same time, 48 temporary stress points and 26 displacement measuring points are arranged on the temporary structure. After the conversion of the steel truss system, monitor stress and displacement before shift and during shifting process. The measured value of temporary structure stress is under 6%, the measured shifting displacement of slide beam midspan is 1-2 mm less than the theoretical value. The result shows that The measured value of each temporary component is always consistent with the theoretical value, and both are within the controlled range.
引文
[ 1 ] 崔文科.跨越运营高铁的铁路钢桁梁桥横移施工技术[J].钢结构,2016,31(6):92-97.
[ 2 ] 李文杰,牙马忠,李兆峰,等.96 m简支钢桁梁转体横移施工过程分析及监控[J].钢结构,2018,33(4):105-109,115.
[ 3 ] 中国工程建设标准化协会.钢结构设计规范:GB50017-2017[S].北京:中国建筑工业出版社,2017.
[ 4 ] 程江敏,程波,邱鹤,等.钢结构加固方法研究进展[J].钢结构,2012,27(11):1-7.
[ 5 ] 李浩.钢混组合简支桁梁的横移施工监控[J].铁道建筑,2015,(6):38-40.
[ 6 ] 吴海涛,李鸥.大跨连续钢桁梁架设施工控制分析[J].公路工程,2012,37(2):137-141,157.
[ 7 ] 易达,毛其峰,季黎黎.超高临时钢管支架施工比较分析[J].施工技术,2012,41(增刊2):156-159.
[ 8 ] 李毅,吕黄兵.大型钢结构施工中临时支撑的设计与验算[J].钢结构,2011,26(7):54-58.
[ 9 ] 彭建萍,高光品,陶正国.京张高铁官厅水库特大桥简支钢桁梁架设技术[J].桥梁建设,2018,48(5):103-107.
[10] 赵瀚玮,丁幼亮,李爱群.高速列车作用下南京大胜关大桥动位移响应分析[J].铁道科学与工程学报,2018,15(9):2187-2195.
[ 2 ] 李文杰,牙马忠,李兆峰,等.96 m简支钢桁梁转体横移施工过程分析及监控[J].钢结构,2018,33(4):105-109,115.
[ 3 ] 中国工程建设标准化协会.钢结构设计规范:GB50017-2017[S].北京:中国建筑工业出版社,2017.
[ 4 ] 程江敏,程波,邱鹤,等.钢结构加固方法研究进展[J].钢结构,2012,27(11):1-7.
[ 5 ] 李浩.钢混组合简支桁梁的横移施工监控[J].铁道建筑,2015,(6):38-40.
[ 6 ] 吴海涛,李鸥.大跨连续钢桁梁架设施工控制分析[J].公路工程,2012,37(2):137-141,157.
[ 7 ] 易达,毛其峰,季黎黎.超高临时钢管支架施工比较分析[J].施工技术,2012,41(增刊2):156-159.
[ 8 ] 李毅,吕黄兵.大型钢结构施工中临时支撑的设计与验算[J].钢结构,2011,26(7):54-58.
[ 9 ] 彭建萍,高光品,陶正国.京张高铁官厅水库特大桥简支钢桁梁架设技术[J].桥梁建设,2018,48(5):103-107.
[10] 赵瀚玮,丁幼亮,李爱群.高速列车作用下南京大胜关大桥动位移响应分析[J].铁道科学与工程学报,2018,15(9):2187-2195.