大跨长联钢桁梁顶推关键技术  

Key Techniques for Incremental Launching of Long Span and Long Continuous Unit Steel Truss Girder

作　　者：姚发海 

机构地区：[1]中铁大桥局股份有限公司,湖北武汉430050

出　　处：《桥梁建设》2011年第2期1-4,共4页Bridge Construction

摘　　要：郑州黄河公铁两用桥主桥分2联布置,第1联为(120+5×168+120)m的六塔连续钢桁结合梁斜拉桥,第2联为5×120 m的连续钢桁结合梁桥,钢桁梁架设采用多点连续同步顶推施工技术。采用MIDAS Civil软件进行钢桁梁顶推施工计算,根据墩顶反力和摩擦力,每墩配2台350 t的连续千斤顶。该桥大跨长联钢桁梁顶推距离为1 080 m,顶推总重量27 000 t,边桁主动顶推,中桁被动移动,采用计算机多点连续动态控制技术。导梁结构与主体钢桁梁通过连接节点由斜桁变直桁。在墩旁设滑道,通过滑道前端千斤顶进行滑块体系转换,实现桁架结构受力要求。The main bridge of Zhengzhou Huanghe River Rail-cum-Road Bridge is arranged in two continuous units,of which the first unit is a six-pylon continuous composite steel truss girder cable-stayed bridge with span arrangement（120＋5×168＋120） m and the second unit is a continuous composite steel truss girder bridge with span arrangement（5×120） m.The first unit truss girder of the bridge was erected by the construction technique of multi-point,continuous and synchronous incremental launching and the MIDAS Civil software was used to conduct the calculation of the launching construction.In view of the reaction force and frictional force at the tops of the piers,2 sets of 350-t capacity continuous jacks were provided at each pier.The incremental launching distance of the long span and long continuous unit truss girder of the bridge was 1 080 m and the total launching weight was 27 000 t.The side trusses were launched positively while the middle truss was moved passively and the technique of the multi-point,continuous and dynamic control of computer was applied.The launching nose structure and the main steel truss girder were transformed form the inclined trusses into the straight ones via the connection points of the structure and the girder.The slipway was arranged by the side of the piers and the system of the slip blocks was transformed by the jacks installed at the front end of the slipway to finally satisfy the force condition requirements of the truss girder structure.

关 键 词：郑州黄河公铁两用桥 大跨度桥 钢桁梁 顶推法架桥 桥梁施工 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U445.462[交通运输工程—道路与铁道工程]