高墩大跨连续刚构桥施工关键技术在百大特大桥的应用
发布时间：2018-09-06 11:14
【摘要】：本文以广西靖那高速公路3标百大特大桥作为施工实例,着重放在大跨高墩连续刚构桥实施过程中中的重难点技术进行了深入的总结研究。(1)薄壁高墩采用翻模+外包提升架施工工艺确保施工作业人员安全操作。采用高精度全站仪和激光垂准仪相结合的方法进行高墩翻模模板定位,并通过数据分析,这两种方法相互校核,确保了高墩施工垂直度。(2)采用墩顶砂箱临时固结技术,确保了连续梁施工稳定安全和临时支座拆除便捷。并利用MIDAS CIVIL 2010有限元计算软件对墩梁临时固结、0#块托架及挂篮施工进行整体建模分析,确保受力计算全面、合理、可靠,方案最优。(3)运用信息化监测技术,对薄壁墩及主梁进行应力应变监测,确保桥梁施工过程受力和变形受控。利用ASCB程序对全桥桥墩及箱梁在施工阶段受力进行建模计算,分析桥梁施工阶段理论受力,与现场监测数据对比,理论分析与监测数据双控,确保了结构安全,线型受控。(4)通过增加边跨不平衡悬臂浇筑段,优化缩短边跨现浇段长度,优化后边跨现浇段可采用无平衡配重托架施工,解决高边墩长大边跨现浇段在复杂地质地形条件下的施工难题。确保了施工质量,提高了施工效率。(5)优化调整多跨连续刚构合拢次序,采用先中跨、再次边跨,最后边跨合拢的顺序,一方面解决了边跨不平衡悬臂浇筑段的影响,另一方面加快了上部箱梁施工进度。
[Abstract]:In this paper, a construction example of a hundred major bridges in Jingna Expressway, Guangxi, is presented. The emphasis is placed on the heavy and difficult techniques in the implementation of continuous rigid frame bridges with long span and high piers. (1) the construction technology of overturning high piers is adopted to ensure the safe operation of construction workers. The high precision total station instrument and laser vertical register are used to locate the high pier turnover formwork. Through the data analysis, the two methods are checked each other to ensure the perpendicularity of the high pier construction. (2) the temporary consolidation technology of the sand box on the top of the pier is adopted. It ensures the construction stability and safety of continuous beam and convenient removal of temporary support. By using MIDAS CIVIL 2010 finite element calculation software, the integral modeling and analysis of temporary consolidation block bracket and hanging basket construction of pier and beam are carried out to ensure comprehensive, reasonable, reliable and optimal scheme. (3) Information monitoring technology is used. The stress and strain monitoring of thin-walled piers and main beams is carried out to ensure that the stress and deformation of the bridge are controlled during construction. Using ASCB program to model and calculate the force of the bridge pier and box girder in the construction stage, analyzing the theoretical force of the bridge during the construction stage, comparing with the monitoring data, the double control of the theoretical analysis and monitoring data ensures the safety of the structure. Linear control. (4) by increasing the side span unbalance cantilever casting section, the length of the side span cast-in-place section can be optimized and the backside span cast-in-situ section can be constructed with non-balanced counterweight bracket. To solve the construction problem of the cast-in-situ section of the long side span of high side pier under the complex geological terrain conditions. The construction quality is ensured and the construction efficiency is improved. (5) the order of multi-span continuous rigid frame closure is optimized and adjusted, and the order of first middle span, second edge span and last side span closure is adopted, on the one hand, the influence of edge span unbalance cantilever pouring section is solved. On the other hand, it speeds up the construction progress of upper box girder.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
本文编号：2226180
[Abstract]:In this paper, a construction example of a hundred major bridges in Jingna Expressway, Guangxi, is presented. The emphasis is placed on the heavy and difficult techniques in the implementation of continuous rigid frame bridges with long span and high piers. (1) the construction technology of overturning high piers is adopted to ensure the safe operation of construction workers. The high precision total station instrument and laser vertical register are used to locate the high pier turnover formwork. Through the data analysis, the two methods are checked each other to ensure the perpendicularity of the high pier construction. (2) the temporary consolidation technology of the sand box on the top of the pier is adopted. It ensures the construction stability and safety of continuous beam and convenient removal of temporary support. By using MIDAS CIVIL 2010 finite element calculation software, the integral modeling and analysis of temporary consolidation block bracket and hanging basket construction of pier and beam are carried out to ensure comprehensive, reasonable, reliable and optimal scheme. (3) Information monitoring technology is used. The stress and strain monitoring of thin-walled piers and main beams is carried out to ensure that the stress and deformation of the bridge are controlled during construction. Using ASCB program to model and calculate the force of the bridge pier and box girder in the construction stage, analyzing the theoretical force of the bridge during the construction stage, comparing with the monitoring data, the double control of the theoretical analysis and monitoring data ensures the safety of the structure. Linear control. (4) by increasing the side span unbalance cantilever casting section, the length of the side span cast-in-place section can be optimized and the backside span cast-in-situ section can be constructed with non-balanced counterweight bracket. To solve the construction problem of the cast-in-situ section of the long side span of high side pier under the complex geological terrain conditions. The construction quality is ensured and the construction efficiency is improved. (5) the order of multi-span continuous rigid frame closure is optimized and adjusted, and the order of first middle span, second edge span and last side span closure is adopted, on the one hand, the influence of edge span unbalance cantilever pouring section is solved. On the other hand, it speeds up the construction progress of upper box girder.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4
【引证文献】
相关期刊论文 前1条
1 杨鲁坡;;连续刚构桥高墩边跨现浇段托架设计[J];工程技术研究;2017年02期
，本文编号：2226180
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