外振内击扩底灌注桩施工法外振内击扩底灌注桩是一种新型的小口径扩底灌注桩。它是利用振动锤或振动锤和内击锤的共同作用，将桩管沉到设计标高，然后灌入干硬性混凝土，用内击锤将干硬性混凝土夯出管外，制成扩大头，再吊放钢筋笼和灌注桩身混凝土，最后拔桩管而成的一种... External vibration inner shot bottom expanding cast-in-place pile construction method External vibration inner bottom-expanded cast-in-place pile is a new type of small-diameter enlarged bottom cast-in-place pile. It is the use of vibrating hammer or vibratory hammer and internal hammer to work together to sink the pile pipe to the design elevation, then pour it into dry hard concrete, and use the internal hammer to pull the dry hard concrete out of the pipe to make it an enlarged head. Lifting steel cage and pouring concrete into the pile, and finally pulling out the pile tube...