高墩大跨连续刚构桥线形控制关键技术研究

桥梁线形控制是施工监控的关键内容,是保证桥梁顺利合龙和成桥线形达到设计要求的技术保障.影响连续刚构桥线形的因素繁多,一旦控制不好会影响成桥后行车舒适度,甚至造成桥梁跨中下挠等严重工程事故,文章结合怒江特大桥的监控实例,综合分析了高墩大跨连续刚构桥的线形监控要点,采用有限元仿真计算与现场实时监控数据相结合的监控方法,通过调整施工立模标高,达到控制结构整体线形的目的,并对比分析监控数据的理论计算值与实测值.实践表明,在怒江特大桥施工监控过程中所采用的技术措施,不仅为大桥的成功修建起了重要作用,也为连续刚构桥施工线形控制积累一定的经验.

Key Technique Research of Linear Control for Long Span Continuous Rigid Frame Bridge with High-Rise Piers

The bridge linear control is the key content of construction monitoring which guarantees smooth closed and the linear of bridge to meet the design requirements. There are a lot of influence factors of the continuous rigid frame bridge＇linear. Once the control is bad will not only affect the driving comfort, but also even cause serious engineering accidents of midspan＇ downward. So, in this paper, combined with the monitoring of Nujiang Giant Bridge to make a comprehensive analysis of the linear monitoring points of the long-span continuous rigid frame bridge with high piers, use the method of the finite element simulation calculation that combined with the real-time monitoring to monitor. Through the adjustment of the vertical mold elevation, the purpose of linear structure controlling is obtained, the theoretical calculated values and measured values are contrasted and analysed. Practice shows that the technical measures adopted in the process of Nujiang bridge＇ construction monitoring, not only has played an important role in the success of the bridge construction, but also has accumulated some experience for the linear construction control of continuous rigid frame bridge.