对于导轨式桩架打斜桩时的稳定性验算,一般认为和起重机的稳定性验算相似。由此算得的稳定性安全系数往往很大。而在实际施工时,桩架却很容易向后倾复失稳。为什么会出现这种情况呢?主要是对桩架的起重荷载(主要指预制桩和桩锤)高度高、重量重这个特点没有引起注意,对桩架向后倾复的主要原因没有搞清,例如:哈尔滨建筑工程学院和西安冶金建筑学院合编的《混凝土机械和桩工机械》一书认为:“桩架打斜桩时,容易向后倾翻失稳。主要是配重和 For the stability calculation of the inclined pile with rail type pile, it is generally considered that it is similar to the stability verification of the crane. The stability safety factor thus calculated is often very large. In actual construction, the pile frame is easily tilted backwards and destabilized. Why is this happening? The main reason is that the lifting load (mainly refers to the prefabricated pile and pile hammer) of the pile frame does not attract attention because of its high height and heavy weight. The main reason for the backward tilting of the pile frame is not clear. For example, the book “Concrete Machinery and Piling Machinery” edited by Harbin Institute of Civil Engineering and Architecture and Xi’an Metallurgical and Architectural Institute believes that “When piles are slapped, they tend to tip backwards and lose stability. Mainly weights and