大跨径钢桁梁步履式多点同步顶推施工技术

Technique for pushing long-span steel truss to position with walking type mechanism from multiple points synchronously

北盘江特大桥边跨钢桁梁采用步履式顶推施工工艺,文中主要从施工特点、临时措施、施工关键技术等方面对施工工艺进行了阐述。采用步履式顶推工艺进行钢桁梁施工具有临时措施简单、设备使用少、同步精度高、纠偏方便等特点,同时有效地解决了钢桁梁在顶推过程中需节点受力的难题。

The side -span steel truss for Beipanjiang Bridge was installed with the technique of pushing steel truss to itsposition witha walking type mechanism from multiple points synchronously. We expound on the technology from the features ofconstruction, temporary measures and key technology for bridge building. When the walking type mechanism to push the steeltruss to position is used, the technique has lots of advantages, such as simple temporary measures, less equipment used, highprecision synchronization, and simple correction of deviation, and has effectively solved the problem that the nodes of steel trusshad to take the weight when the steel truss girder was being pushed.