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为了便于掌握与应用《桥规》(即铁路工程技术规范桥涵篇,下同)附录十八中双动汽锤打桩公式,今将该公式的推导如下,供同志们参考。《桥规》中的双动汽锤打桩公式,是根据能量不灭原理推导而来。桩锤所持的能量,在与桩碰撞的瞬间,一部分消耗于热与声上;一部分仍保留于锤中,以动能的形式随桩的沉入而运动;但绝大部分的能量传给桩体,使桩克服土壤的阻力而下沉。保留于锤中的能量,在桩锤不产生回跃的情况下,最后仍传给桩体。传给桩体的全部能量,除了消耗于桩体弹性压缩、桩帽弹性压缩和土壤弹性变形外,剩余的能量,则克服土壤阻力而使桩下沉。
In order to facilitate the grasping and application of the double-acting hammer hammering formula in Appendix 18 of the “Bridge Regulation” (that is, the Bridge Engineering Specification for Railway Engineering, the same below), this formula is derived as follows for reference by comrades. Double-acting hammer hammer piling formula in “bridge gauge” is derived from the principle of immortal energy. The energy held by the pile hammer consumes part of the heat and sound at the moment of collision with the pile, and part remains in the hammer and moves in the form of kinetic energy with the sinking of the pile. However, most of the energy is transmitted to the pile body , So that the pile overcomes the resistance of the soil and sink. The energy retained in the hammer will eventually pass to the pile if the hammer does not produce a kickback. The total energy transmitted to the pile, in addition to consuming the elastic compression of the pile, the elastic compression of the pile cap and the elastic deformation of the soil, the excess energy is overcome by soil resistance and pile sinking.