高寒峡谷地区大跨度混凝土梁斜拉桥主梁施工关键技术

Key construction technology of main girder of long span concrete beam cable-stayed bridge in alpine canyon area

荣乌高速公路准格尔黄河特大桥主跨为440 m双塔双索面混凝土斜拉桥。主梁距离地面高度超过120 m,0—1号梁段现浇施工采用在塔上搭设斜支架+抽插压浆式牛腿结构,减少了牛腿与预埋件间的焊接工作量,降低了高大支架安装施工风险。主梁悬浇施工中挂篮自动化控制、斜拉索索力转换及冬季施工采取了一系列新工艺和创新技术,安全高效地完成了主梁施工,为今后类似桥梁施工提供经验和借鉴。

The main span of Zhungeer Yellow River Bridge on Rongwu expressway is 440 m double tower and double cable plane concrete cable-stayed bridge.The main beam is more than 120 m away from the ground.The cast-in-place construction of No.0-1 beam section adopts the structure of erecting inclined support on the tower+suction and insertion grouting corbel,which reduces the welding workload between corbel and embedded parts,and reduces the risk of installation and construction of tall support.A series of new technologies and innovative technologies have been adopted in hanging basket automatic control,cable force conversion of stay cable and winter construction in the main girder cantilever construction,which can safely and efficiently complete the main girder construction tasks,and provide experience and reference for similar bridge construction in the future.