鄂东大桥混合梁斜拉桥合龙技术

Closure technique for the hybrid girder cable-stayed bridge of Edong Bridge

结合世界第二混合梁斜拉桥——主跨926 m的鄂东大桥,研究了大跨径混合梁斜拉桥中跨合龙方案的影响因素及关键技术,确定采用加载合龙方案。加载合龙方法具有较好的温度适应性,对成桥结构线形和受力影响很小,满足无应力施工控制方法的要求,适用于大跨径混合梁斜拉桥。研究成果及实践经验对同类型桥梁具有借鉴指导意义。

Based on Edong Bridge,which is the second longest hybrid girder cable-stayed bridge with 926 m long main span,the influencing factors and crucial techniques of the main span closure method for long span hybrid girder cable-stayed bridge are studied.After theoretical analysis,numerical evaluation and practical test,the loading assistant closure method is employed in Edong Bridge.The loading assistant closure method,with better thermal adaptability and less influence on bridge line and the forced status,can meet the requirements of the unstressed state control method.Based on the mentioned advantages,the loading assistant closure method is applicable to long span hybrid girder cable-stayed bridges.The conclusion can provide reference for the further design of the similar bridges.