琅岐闽江大桥主桥钢箱梁顶推合龙控制技术

发布时间：2018-07-03 03:00

本文选题：斜拉桥 + 钢箱梁　；参考：《世界桥梁》2014年05期

【摘要】：琅岐闽江大桥主桥为(60+90+150+680+150+90+60)m七跨连续半飘浮体系双塔双索面斜拉桥,主梁为栓焊结构钢箱梁,采用悬臂拼装法施工,中跨合龙段长12 m,合龙段自重约170 t。为了使大桥能够高精度顺利安全合龙,且成桥后结构内力、线形状态达到预期目标状态,基于无应力状态法原理的控制思想,确定中跨采用双边吊梁、无劲性骨架锁定、顶推法进行合龙。采用MIDAS Civil 2011对合龙关键工序进行详细计算分析,得到合龙顶推力、顶推位移限值等关键控制参数;分析了顶推过程中的索力、线形变化规律,以验证结构合龙安全可靠;分析得到合龙段无应力长度较小的改变对成桥目标状态影响较小。工程实践表明采用该方法进行合龙控制是可行的,桥梁合龙后内力状态与设计目标一致。
[Abstract]:The main bridge of Luangqi Minjiang River Bridge is (6090 150 680 150 90 60) m 7 span continuous half floating system double tower and double cable plane cable-stayed bridge. The main girder is steel box girder of bolted welding structure, which is constructed by cantilever assembly method. The length of middle span closure section is 12 m, and the self weight of closure section is about 170 t. In order to make the bridge close with high precision and safety, and the internal force and linear state of the structure after completion reach the expected target state, based on the control idea of the principle of the stress-free state method, it is determined that the middle span should adopt the bilateral suspension beam, and the stiffness skeleton is locked. The thrusting method is used to close the dragon. Midas Civil 2011 is used to calculate and analyze the key processes of closure in detail, and the key control parameters such as the top thrust and the limit of displacement are obtained, and the law of cable force and linear variation in the process of pushing is analyzed to verify the safety and reliability of the closure of the structure. The analysis shows that the small length of stress free in the closure section has little effect on the target state of the bridge. The engineering practice shows that this method is feasible and the internal force state of the bridge after closure is consistent with the design goal.
【作者单位】：中铁大桥局集团桥科院有限公司;桥梁结构安全与健康湖北省重点实验室;
【分类号】：U445.4

【参考文献】