2500 kJ液压打桩锤砧铁及替打结构冲击性能研究

Study on impact resistance of anvil and substitution structure for 2500 kJ hydraulic pile hammer

基于瞬时冲击数值模拟分析,对2500 kJ液压打桩锤用砧铁及砧铁-替打组合结构进行深入数值仿真分析,针对所给出的8种砧铁和替打结构几何构型方案,从加工材料质量、能量传递效率、应力分布等方面进行了对比分析,综合考虑各项因素确定了砧铁及砧铁-替打组合结构的最优几何构型和材料要求。文中所建议的砧铁及砧铁-替打组合结构可满足最大冲击能2500 kJ作业时结构安全系数不小于2.5的要求;同时,冲击能量传递效率大于80%。

Based on the immediate impact numerical simulation,this paper profoundly analyzes the anvil structure for 2500 kJ hydraulic pile hammer.The geometric configuration and material requirements of the anvil structure are determined.The finite element simulation results show that the anvil structure and anvil-replacement combined operation scheme proposed in this paper can meet the requirement of a structural safety factor of at least 2.5.Simultaneously,the energy transfer ratio is not less than 80%.