摘要
卵砾石地层属钻探复杂地层，也是基础工程施工的主要地层。目前，国内外卵砾石地层的钻进方法存在局限性大、效率低、成本高、工艺复杂、易出现孔内事故等缺点。钢管桩的应用日趋广泛。卵砾石层中有效的施工工艺亟待解决。在理论研究与实践的基础上，提出高效的钢管静压冲击钻进工艺。
ln foundation engineering construction, the formation of cobble and gravel , the main type of building foundation mation , four drilling methods are used in the world. But all the method. have some lim- mitation. such as low efficiencg. high cost 、complicated process . easy occuring hale ac- cidents, etc. . the steel pipe pile in foundation construction is widely used. lt is urgent to study an efficient construction technique in the formation of cobble and gravel. On the basis of theary and practic , the accthors of this paper put forward an efficient static load and percussive drilling technique of steel pipe pile. lt has been proved an excellent in field IDractice.
关键词
卵砾石层
钢管桩
静压冲击钻井
桩基础
formation of cobble and gravel . steel pipe pile , drilling on static load and percussive force
