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根据振动沉拔挤密砂、碎石桩施工的现状，分析了断桩、缩颈的产生原因，研制了简单易行的气压灌注设备，有效地消除了困扰施工质量的通病。
According to the present situation of vibrating sinking and compaction sand and gravel pile construction, the reasons of broken piles and necks are analyzed, and a simple and easy pressure infusion equipment is developed, which can effectively eliminate the common problems that plague the construction quality.