拱架现浇拱圈混凝土拱桥的合理施工程序与方法

发布时间：2018-08-21 07:15

【摘要】：针对目前确定拱架现浇拱圈混凝土浇筑顺序主要考虑拱架变形而未考虑结构应力的现状,以贵州甘河沟大桥主桥为工程背景,结合其原施工方案初步确定了分环分段位置,利用MIDAS软件对拱架现浇拱圈混凝土的施工全过程进行仿真分析,综合考虑拱架变形和结构应力,通过多方案计算对比确定了合理的最优浇筑方案:第1环混凝土浇筑顺序为先拱脚段再拱顶段最后中间段;第2环混凝土浇筑顺序为先拱顶段再拱脚段最后中间段;第3环混凝土拱顶、拱脚和中间段均再细分成2部分,浇筑顺序为先依次施工拱顶段、中间段和拱脚段第1部分,而后再依次施工拱顶段、拱脚段和中间段第2部分;拱上建筑浇筑顺序为从拱顶向拱脚依次施工。拱架变形和结构应力的实测值与理论值总体上吻合较好,表明该程序与方法合理可靠。
[Abstract]:In view of the present situation of determining the pouring order of arch frame cast-in-situ arch ring concrete mainly considering the deformation of arch frame and not considering the structural stress, taking the main bridge of Gan Hegou Bridge in Guizhou as the engineering background, and combining with the original construction plan, the position of ring dividing section is preliminarily determined. The whole construction process of in-situ arch ring concrete of arch frame is simulated and analyzed by using MIDAS software. The deformation and structural stress of arch frame are considered synthetically. The reasonable optimal pouring scheme is determined by comparison of multiple schemes: the first ring concrete pouring sequence is the last middle section of the arch foot section and the last middle section of the arch top section, the second ring concrete pouring sequence is the last middle section of the arch top section and then the arch foot section, the second ring concrete pouring sequence is the first arch top section and the last arch foot section. The third ring concrete arch roof, arch foot and middle section are subdivided into two parts. The pouring sequence is the first construction of the arch top section, the first part of the middle section and the arch foot section, and then the construction of the arch top section, the arch foot section and the second part of the middle section. The construction sequence of the arch is from the top of the arch to the foot of the arch. The measured values of arch frame deformation and structural stress are in good agreement with the theoretical values, which indicates that the program and method are reasonable and reliable.
【作者单位】：长沙理工大学土木与建筑学院;
【基金】：国家重点基础研究发展计划(973项目)(2015CB057702) 国家自然科学基金(51378080) 长沙理工大学土木工程优势特色重点学科创新性项目(15ZDXK02)~~
【分类号】：U445.4

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