乌江吊拉组合索桥—一种新的桥型及施工方法

Cable-Stayed and Suspension Bridge over Wujian River-A New Type of Bridge and Its Construction Method

乌江大桥是世界上第一座由吊桥和斜拉桥组合而成的吊拉组合桥 ,也是国内首次采用钢筋、钢纤维、钢丝网复合混凝土薄壁箱梁 ,成功的使用了预应力岩锚代替传统的重力式锚 ,节省了大量锚碇混凝土。在施工工艺上首创了用缆吊平台“无猫道架设主缆新工艺”,完善了重 10 0 t箱梁缆吊悬拼等施工工艺。通过 3年运营证明 ,乌江大桥结构性能良好。文章主要介绍主塔、岩锚、箱梁预制吊装、无猫道主缆架设的施工工艺。

The Wujiang River Bridge is the first bridge that its deck supported by a combination of cables stayed and suspended in the world. The composite concrete thin wall box beam with reinforcement, steel fibre and steel wire mesh has been adopted in China for the first time. The traditional gravity anchoring is successfully replaced by prestressed rock anchoring, which saves a significant quantity of concrete anchoring. The pioneering techniques of construction, such as “flying fox (cradle)” and “main cable erection construction without temporary bridge” facilitated the erection and joining of 100-ton box deck beams. After two years in operation, the bridge is certified as good in its structure and performance. In this article, main tower erection, rock anchoring, prestressing and erection of beams, main cable erection without temporary bridge are described.