贵黔高速鸭池河特大桥钢桁梁施工关键技术

发布时间：2018-08-22 20:40

【摘要】：贵黔高速鸭池河特大桥为主跨800m的钢桁-混凝土混合梁斜拉桥,中跨钢桁梁采用"N"形桁架。受地形、运输和工期等条件限制,该桥采用缆索吊机进行16m长钢桁梁节段整体悬臂拼装。施工中,在边跨增设主动张拉的背索,以抵消缆索吊机对该桥变形的影响;优化接头处高强螺栓施工的时间和顺序,以防止新节段安装时高强螺栓受剪;重视钢桁梁节段现场的预拼装、测量和误差调整工作,以确保16m长节段拼装精度;采用等值张拉法和群锚千斤顶张拉,以实现钢绞线斜拉索的索力均匀性和整体索力控制;优化斜拉索施工索力,以实现合龙口姿态的调整,采用温度自然合龙法,以实现高精度合龙。鸭池河特大桥合龙后主梁线形平顺,施工误差满足规范要求,该桥已于2016年7月建成通车。
[Abstract]:The Yazhi River Bridge with a main span of 800m is a cable-stayed bridge with steel trusses and concrete beams, and the middle span steel truss is "N" truss. Due to the constraints of terrain, transportation and construction period, the bridge uses cable crane to assemble the whole cantilever of 16m long steel truss beam segment. In order to counteract the influence of cable crane on the deformation of the bridge, the construction time and sequence of the high strength bolt at the joint are optimized to prevent the shear of the high strength bolt when the new segment is installed. In order to ensure the assembly accuracy of 16m long segment, the cable force uniformity and integral cable force control are realized by using the equivalent tension method and group anchor Jack tension, so as to realize the cable force uniformity and the integral cable force control, and pay more attention to the pre-assembly, measurement and error adjustment of the steel truss section segment in order to ensure the assembly accuracy of the 16m long segment, and adopt the equivalent tension method and the group anchor Jack to pull the cable. The cable force of cable construction is optimized to adjust the attitude of closing Longkou, and the temperature natural closure method is adopted to realize high precision closure. The main beam of the Yazhi River Bridge is smooth after closing, and the construction error meets the requirements of the code. The bridge was completed and opened to traffic in July 2016.
【作者单位】：同济大学桥梁工程系;中交路桥建设有限公司;
【分类号】：U445.4

【相似文献】