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目前对打桩动力公式的适用性和应用问题还存在很大误解,下面着重对该问题进行一些探讨。常见的打桩动力公式有二种: 建设省公布的公式:Ra=F/(5S+0.1) ……(24)钢管桩标准公式:Ra=(ef)/(3(S+K/2)) ……(25) 这些公式看来很简单,而有的地方却很不明确。分子因含有ef与F就其大小模糊不清。式中ef为锤击效率,一般取0.5,因此(25)式可改写成:
At present, there are still a lot of misunderstandings about the applicability and application of the pile driving force formula. The following discussion focuses on the problem. There are two common formulas for piling power: the formula published by the Ministry of Construction: Ra = F / (5S + 0.1) (24) The standard formula of steel pipe pile: Ra = (ef) / (3 (S + K / 2) ) ... (25) These formulas appear to be simple, but not clear in some places. The molecules are fuzzy in size due to their inclusion of ef and F Where ef hammering efficiency, generally take 0.5, so (25) can be rewritten as: