武汉天兴洲长江大桥大直径钻孔灌注桩施工技术

Construction Technology of Large Diameter Bored Piles in Changjiang Bridge of Wuhan Tianxingzhou

针对武汉天兴洲公铁两用长江大桥4号墩桩基直径大、孔深、嵌岩深的施工特点,采用气举反循环工法,优选钻进参数、泥浆配比,取得了良好的效果,介绍了该钻孔灌注桩施工技术。

In view of construction difficulty of bored pile in Changjiang highway and railway bridge of Wuhan Tianxinzhou with large diameter and extra-deep borehole with rock point,air-lift reverse circulation method and different drilling parameters and technology were adopted for different formations with considerable technique result and economical benefit.Construction technology of bored piles was introduced in this paper.