采用组合法施工的钢筋混凝土拱桥劲性骨架构造及对内力影响研究
发布时间：2019-03-07 15:18
【摘要】：大跨度混凝土拱桥是西部山区较为理想的桥型。近年来国内应用悬臂浇筑法先后在贵州和四川建成了4座混凝土拱桥,反映出拱圈整体性好、外形美观等优点。然而,随着拱圈跨径的增大,悬浇长度也随之增加,给扣锚系统、施工控制带来了技术难度。将悬臂浇筑和劲性骨架法结合,不仅可以缩短悬浇长度,而且可以提前实现合龙、降低施工风险。为此,本文以贵州省交通运输厅科技项目“悬臂浇筑与劲性骨架组合的大跨度砼拱桥技术关键与示范”为依托,开展了以下研究工作:①参照日本头岛大桥的设计理念,针对主跨210m的贵州夜郎湖大桥,提出拱脚区段采用变截面混凝土拱箱、拱顶区段采用钢箱劲性骨架合龙、后浇筑外包混凝土的主拱圈构造形式,以达到增大拱桥跨径、合理运用材料、减轻拱圈自重为目的。基于ANSYS优化方法,优化出合理的拱轴系数,开展了成桥阶段内力计算。②拟定了主拱圈悬臂浇筑、劲性骨架安装顺序,基于“应力平衡法”控制技术,利用APDL语言编制了拱圈施工计算命令流,通过索力优化方法计算出能满足截面应力与拱圈线形的扣索力,分析了主拱圈截面的应力变化规律。③针对劲性骨架外包混凝土施工,拟定了竖向分三环,纵向分6个工作面,按2.9m和5.8m两种分段长度和两种反向的浇筑顺序(从拱脚至拱顶浇筑、从拱顶至拱脚浇筑)两两组合成的4种浇筑方式,分析表明,文中拟定的浇筑方式均能满足施工要求,以浇筑段2.9m,拱脚至拱顶的浇筑顺序较为合理。
[Abstract]:Long-span concrete arch bridge is an ideal bridge type in western mountainous area. In recent years, four concrete arch bridges have been built in Guizhou and Sichuan by cantilever casting method, which reflects the advantages of good integrity and beautiful appearance of arch rings. However, with the increase of span of arch ring, the length of cast-in-place increases, which brings technical difficulty to anchor system and construction control. The combination of cantilever casting and rigid skeleton method can not only shorten the length of cast-in-place, but also realize the closure ahead of time and reduce the construction risk. Therefore, based on the science and technology project of Guizhou Provincial Transportation Bureau, "the key and demonstration of long-span concrete Arch Bridge combined with cantilever casting and rigid Skeleton", this paper has carried out the following research work: 1According to the design concept of Thoudao Bridge in Japan, Aiming at the 210m main span of Guizhou Yolanghu Bridge, it is put forward that variable section concrete arch box is used in arch foot section, steel box rigid skeleton closure is adopted in arch top section, and the main arch ring structure of encased concrete is built after pouring, so as to increase the span of arch bridge. Reasonable use of materials for the purpose of reducing the weight of the arch ring. Based on the ANSYS optimization method, the reasonable arch axis coefficient is optimized and the internal force calculation is carried out at the completion stage of the bridge. (2) the cantilever casting of the main arch ring and the installation sequence of the rigid skeleton are formulated, and the control technology based on the "stress balance method" is proposed. The command flow of arch ring construction calculation is compiled by APDL language, and the fastening force which can satisfy the cross-section stress and arch ring alignment is calculated by the cable force optimization method, and the stress variation rule of the main arch ring section is analyzed. 3 the concrete construction with rigid skeleton is carried out, and the stress variation law of the main arch ring section is analyzed. In this paper, four pouring methods are proposed, which are divided vertically into three rings and longitudinally divided into 6 working faces, according to 2.9m and 5.8m segmented lengths and two reverse pouring sequences (from arch foot to arch top, from arch top to arch foot) and from arch to arch foot. The analysis shows that the casting methods proposed in this paper can meet the requirements of construction, the pouring section is 2.9 m and the pouring sequence from arch foot to arch roof is more reasonable.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
本文编号：2436227
[Abstract]:Long-span concrete arch bridge is an ideal bridge type in western mountainous area. In recent years, four concrete arch bridges have been built in Guizhou and Sichuan by cantilever casting method, which reflects the advantages of good integrity and beautiful appearance of arch rings. However, with the increase of span of arch ring, the length of cast-in-place increases, which brings technical difficulty to anchor system and construction control. The combination of cantilever casting and rigid skeleton method can not only shorten the length of cast-in-place, but also realize the closure ahead of time and reduce the construction risk. Therefore, based on the science and technology project of Guizhou Provincial Transportation Bureau, "the key and demonstration of long-span concrete Arch Bridge combined with cantilever casting and rigid Skeleton", this paper has carried out the following research work: 1According to the design concept of Thoudao Bridge in Japan, Aiming at the 210m main span of Guizhou Yolanghu Bridge, it is put forward that variable section concrete arch box is used in arch foot section, steel box rigid skeleton closure is adopted in arch top section, and the main arch ring structure of encased concrete is built after pouring, so as to increase the span of arch bridge. Reasonable use of materials for the purpose of reducing the weight of the arch ring. Based on the ANSYS optimization method, the reasonable arch axis coefficient is optimized and the internal force calculation is carried out at the completion stage of the bridge. (2) the cantilever casting of the main arch ring and the installation sequence of the rigid skeleton are formulated, and the control technology based on the "stress balance method" is proposed. The command flow of arch ring construction calculation is compiled by APDL language, and the fastening force which can satisfy the cross-section stress and arch ring alignment is calculated by the cable force optimization method, and the stress variation rule of the main arch ring section is analyzed. 3 the concrete construction with rigid skeleton is carried out, and the stress variation law of the main arch ring section is analyzed. In this paper, four pouring methods are proposed, which are divided vertically into three rings and longitudinally divided into 6 working faces, according to 2.9m and 5.8m segmented lengths and two reverse pouring sequences (from arch foot to arch top, from arch top to arch foot) and from arch to arch foot. The analysis shows that the casting methods proposed in this paper can meet the requirements of construction, the pouring section is 2.9 m and the pouring sequence from arch foot to arch roof is more reasonable.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
【参考文献】
相关硕士学位论文 前1条
1 杨昌龙;采用悬臂浇筑与劲性骨架法施工的大跨径混凝土拱桥施工稳定性研究[D];重庆交通大学;2014年
，本文编号：2436227
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