大跨度窄箱式钢混组合梁施工技术

Construction Technology of Large-Span Narrow Box Steel-Concrete Composite Beam

包家庄特大桥主桥部分设计为钢混组合梁,主桥长630m,钢梁截面为工字形截面,采用窄箱式边主梁通过横联连接,顶推法成桥。受地形条件限制,主桥长距离高空顶推施工难度大。针对施工过程中的重点和难点,介绍了大跨度窄箱式钢混组合梁顶推施工过程和方法。

The main bridge of Baojiazhuang super large bridge is designed as steel-concrete composite beam.The length of the main bridge is630 m,and the steel beam section is I-beam section.The narrow box side main beam is connected by cross connection,and the bridge is formed by pushing method.Due to the limitation of terrain conditions,it is difficult to construct the long distance high altitude jacking of the main bridge.In view of the key points and difficulties in the construction process,the construction process and method of large span narrow box steel-concrete composite beam are introduced.