本文介绍我国目前最长的公路桥——郑州黄河公路大桥水中段施工,着重介绍国内最大直径(φ2.2m)钻孔桩的水上施工方法、反循环法钻进、穿过河床抛石层的措施、水下混凝土快速拆接导管及超声波检测水下混凝土质量,以及国内最大张拉吨位的50m预应力梁制造和140t架桥机液压系统等情况。 This paper introduces the construction of the middle section of the Yellow River Highway Bridge, the longest existing road bridge in our country, and focuses on the waterborne construction method of the bored piles with the largest diameter (φ2.2m) in China. The reverse circulation method drills through the river bed riprap Measures, rapid demolition of underwater concrete pipe and ultrasonic testing of underwater concrete quality, and the largest tension tonnage of the 50m prestressed beam manufacturing and 140t erecting machine hydraulic system and so on.