汉江五桥主桥中跨合龙段顶推施工关键技术

• 作 者: 张建军 文良东 闫石 孙雄
• 机 构: 中交二公局第五工程有限公司,
• 出 处: 公路交通科技(应用技术版)
• 发表日期: 2013年10期
• 关键词: 顶推 合龙段 施工关键技术 刚构桥 双肢薄壁 中跨合龙 温度荷载 五桥 梁拱 运营阶段

襄阳汉江五桥主桥(左、右航道桥)为梁拱组合体系连续刚构桥,4跨连续结构,主墩采用双肢薄壁墩。为降低运营阶段主梁混凝土收缩徐变、温度荷载等对边墩的不利影响,设计要求在施工阶段对中跨合龙前对合龙口进行顶推,储备一定的应力与预偏在2个边墩处。在以往项目中,类似的合龙顺序与顶推工艺较少见,本文对汉江五桥顶推装置设计、顶推施工、顶推观测等方面进行了总结提炼,为类似工程提供参考。

The main bridge (left and right channel bridges) of Xiangyang Hanjiang River Fifth Bridge is a continuous rigid frame bridge with a combination of beam arch and arch structure, with 4-span continuous structure. The main pier adopts double-limb thin-walled piers. In order to reduce the adverse effects of shrinkage and creep and temperature load on the side piers of the concrete during operation, the design requires that during the construction phase, the coupler should be pushed in before the closure of the mid-span, reserving some stress and pre-deflection at the two side piers . In the past projects, the similar sequence and pushing technology are rare. This paper summarizes the design, pushing construction and pushing observation of the pushing device of the fifth Hanjiang River Bridge and provides reference for similar projects.