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近年来，随着我国国民经济蓬勃发展，城市的高层建筑、立交桥、海港码头都在迅速兴建，钻大口径基础桩得到广泛的应用。一、钻进方法以往基础施工部门，多采用冲击打桩孔，称冲孔桩。从工艺上注定：工效慢、垂直度差、盈溢系数大、耗费混凝土材料、以岩渣判断层位，欠准确等。我们以回转钻，把钻探工艺用于基础工程施工，很受设计工程技术人员的欢迎，桩孔称为钻孔桩。优点较多，在重要工程设计部门都指定采用钻孔桩。为此，近年来钻孔桩发展很快。
In recent years, with the vigorous development of China’s national economy, the city’s high-rise buildings, overpasses, and seaport terminals have all been rapidly constructed, and large-diameter foundation piles have been widely used. First, the drilling method In the past, the basic construction department used impact piling holes, called punch piles. From the process is destined to: slow ergonomics, poor verticality, large surplus coefficient, the consumption of concrete materials, to determine the horizon with rock and slag, less accurate and so on. We use rotary drilling to apply the drilling process to the construction of basic projects, which is very popular with design engineering technicians. The pile holes are called bored piles. There are many advantages. Drilled piles have been specified in important engineering design departments. For this reason, bored piles have developed rapidly in recent years.