摘要
相较连续刚构桥,部分斜拉桥多了斜拉索施工环节,增加了主梁有索区施工过程的复杂性,现有的设计工序一般工期较长,且工作面存在冲突。依托磨寨乌江特大桥,通过建立不同挂索工序数值模型,开展主梁有索区施工工序优化研究。结果表明:1)斜拉索滞后施工可解决工作面冲突和避免初期浇筑混凝土强度不满足张拉条件的问题,子工序并行施工,可节约施工工期;2)斜拉索滞后1节段施工,对斜拉索索力、主梁应力和变形影响均较小,索力偏差小于5%;斜拉索滞后2节段施工,对斜拉索索力和主梁上缘应力影响不大,索力偏差小于5%,但对主梁变形和下缘应力影响较为明显;3)斜拉索滞后1节段施工是比较安全可行的施工工序,既可节省工期,又不会过度增加施工控制难度。
Compared with continuous rigid frame Bridges,extradosed cable-stayed bridge have more cable-stayed construction links,which increases the complexity of the construction process of the cable area of the main beam.The existing design process generally has a longer duration,and there are conflicts on the working surface.Based on Mozhai Wujiang bridge,this paper carried out optimization research on construction process of cable area of main beam by establishing numerical models of different cable operation.The main research conclusions are as follows:1)The delayed construction of the cable can solve the conflict of the working face and avoid the problem that the strength of the initial poured concrete does not meet the tensioning conditions.Meanwhile,the construction can be carried out in parallel and the construction period can be saved;2)The construction of the cable is delayed by 1 section,which has little influence on the cable force,the stress and deformation of the main beam,and the deviation of the cable force meets the requirement of no filling tension.When the cable is delayed by 2 sections,it has little effect on the cable force and the stress on the upper edge of the main beam.The deviation of the cable force is smaller than 5%,but it has obvious effect on the deformation of the main beam and the stress on the lower edge;3)The construction process that the cable lags by 1 section construction is relatively safe and feasible,which can save the construction period and will not excessively increase the difficulty of construction control.
作者
胡力
秦金涛
朱俊良
苗超杰
HU Li;QIN Jintao;ZHU Junliang;MIAO Chaojie(Chongqing Yuxiang Double-line Expressway Co.,Ltd.,Chongqing 404100;China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067;State Key Laboratory of Bridge Engineering Structural Dynamics,Chongqing 400067)
出处
《公路交通技术》
2024年第6期66-71,共6页
Technology of Highway and Transport
关键词
部分斜拉桥
主梁有索区
施工工序优化
extradosed cable-stayed bridge
cable area of main beam
construction process optimization
