1 问题的提出目前,振动锤已广泛用于混凝土灌注桩施工。但是国内的振动锤由于只产生垂直振动,成孔质量不高,加之在灌注混凝土过程中,由于桩只作垂直振动,不能像混凝土振动棒那样对灌注混凝土起到振实作用,在遇到断层和地质变化时,容易产生细脖子桩乃至断桩等质量事故。为了克服上述质量事故,施工部门采取了以下的对策: 1 The problem has been raised. Currently, vibratory hammers have been widely used in the construction of concrete cast-in-place piles. However, domestic vibratory hammers only produce vertical vibrations, and the quality of the formation of holes is not high. In addition, in the process of pouring concrete, due to the vertical vibration of the pile, it cannot play the role of solidification on the poured concrete like a concrete vibrator, and it encounters faults. When geology changes, quality accidents such as narrow neck piles and broken piles are likely to occur. In order to overcome the above-mentioned quality accidents, the construction department has taken the following measures: