人工挖孔扩底桩已在建筑工程基础中得到较为广泛的应用。实践证明,此类桩基从技术经济分析中看确有一定的优势,如工程造价合理,施工速度较快,施工机械简单等。人工挖孔桩施工方便、速度较快、不需要大型机械设备,挖孔桩要比木桩、混凝土打入桩震能力强,造价比冲锥冲孔、冲击锥冲孔、冲击钻机冲孔、回旋钻机钻孔、沉井基础节省。从而在公路、民用建筑中得到广泛应用。但挖孔桩井下作业条件差、环境恶劣、劳动强度大,安全和质量显得尤为重要。 Artificial digging hole enlargement pile has been foundations in the construction of a more extensive application. Practice has proved that such pile found from the technical and economic analysis does have some advantages, such as the project cost is reasonable, the construction speed is fast, the construction machinery is simple and so on. Manual digging pile construction is convenient, fast, does not require large-scale machinery and equipment, digging pile than pile, concrete piles into the pile strong ability to cost than the cone punching, impact cone punching, impact drilling punching, Drilling rig drilling, caisson basic savings. Thus in the highway, civil construction has been widely used. However, digging pile underground working conditions, poor environment, labor intensity, safety and quality is particularly important.