由于种种原因,钢筋混凝土桩在锤击过程中桩头破碎而打不到设计标高的现象时有发生。九江外贸码头综合楼基础试打的第一根桩(在设计桩位处试打)就因桩头严重击碎,钢筋变形外露无法继续锤击而打不到设计标高。究其原因有二:其一是未连续锤击。锤击沉桩的原理是锤击力通过桩作用于土,破坏了土壤的原始结构,使土对桩的摩阻力大 Due to various reasons, the pile head of the reinforced concrete pile is broken during the hammering process and the design elevation can not be hit. Jiujiang Foreign Trade Terminal comprehensive building trial hit the first pile (in the design of the pile at the trial) as a result of the pile head severely crushed, steel deformed exposed can not continue to hammer and can not hit the design elevation. There are two reasons: one is not continuous hammering. The principle of hammering sinking pile is that the hammering force acts on the soil through the pile, destroying the original structure of the soil, making the friction resistance of the pile to the pile large