套管成孔灌注桩是用锤击打桩机或振动沉桩机将带有活瓣式桩靴或预制钢筋混凝土桩尖的钢管沉入土中,然后边浇筑混凝土边锤击或振动拔管而成,前者称锤击沉管灌注桩,后者称振动沉管灌注桩。沉管灌注桩适用于一般粘性土、粉土、淤泥和淤泥质土、杂填土,也可用于砂土。沉管灌注桩由于有适用范围广、成桩容易、无泥浆污染、造价便宜等特点而得到广泛使用。但在使用中由 The hole-in-place bored pile is used to hammer steel pipe with flap type piled pile boots or precast reinforced concrete pile tip into the soil with a hammer or pile driver, and then hammer or vibrate to extrude the pipe while pouring the concrete. Into the former, said hammer hammer sinking cast-in-place pile, the latter said vibration sinking cast-in-place pile. The immersed cast-in-place piles are suitable for general cohesive soils, silt, silt and silty soils, miscellaneous fills, and sands. The immersed cast-in-place pile has been widely used due to its wide application range, easy pile formation, no mud pollution, and low cost. But in use by