三塔悬索桥中塔上横梁合龙施工技术

Construction Techniques for Intermediate Tower Cross Beam Closure of Three-Tower Suspension Bridge

武汉鹦鹉洲长江大桥为(200+850+850+200)m三塔四跨悬索桥结构,中塔采用钢-混凝土叠合结构,其中钢塔塔柱、上横梁分段吊装,节段间采用高强度螺栓连接。中塔上横梁在横桥向分为两段,采用分段无支架悬臂安装,使用小型调节工件配合进行节段合龙控制。通过建立有限元计算模型,模拟上横梁施工过程中各主要工况下塔顶变形及合龙口位移值。工程实施中,利用有限元计算结果,对施工过程进行控制,顺利实施了上横梁合龙施工。

The Yingwuzhou Changjiang River Bridge in Wuhan is a three-tower four-span sus-pension bridge with span arrangement of （200 ＋ 850 ＋ 850 ＋ 200） m .The intermediate tower adopts the steel-concrete composite structure ,of which the steel tower columns and upper cross beam were hoisted and installed in segments ,and the segments were connected by high-strength bolts . The upper cross beam of the intermediate tower was divided into two segments in transverse bridge direction ,which were installed in cantilevers without scaffoldings .The small scale adjusting work pieces were used to control the segment closure .The finite element calculation model was estab-lished to simulate the tower top deformation and displacement at the closure gap under the main load cases during the upper cross beam construction .In the practical construction ,the finite ele-ment calculation results were used to control the construction process and the upper cross beam closure was carried out smoothly .