摘要
为分析一个锤击周期内两个锤头连续锤击时对打桩锤锤击力的影响，将锤头结构设计为由上、下锤头和中间垫层组成的组合桩锤，用不同的集中质量块表示上锤头、下锤头、砧座和桩帽，用不同的并联的弹簧和阻尼器表示中间垫层和锤垫，用弹簧表示桩垫，用阻尼器表示桩，建立了平衡方程。采用量纲分析法推导出了锤击力的数值解，分析了桩锤与垫层的分离情况，比较了组合桩锤各参数和垫层参数对锤击力的影响，并与普通桩锤产生的锤击力进行了比较。结果表明：将锤头设计为组合桩锤结构，使得锤击力波形出现多个峰值，且峰值减小，有效锤击时间加长。
Abstract
In order to analyze the influence of the situation that two rams impact one by one in a cycle on impact force for pile hammer, numerical analysis model for combination pile hammer which consists of upper ram and lower ram was presented. In the model, different variable lumped masses were used as upper ram, lower ram, anvil and pile cap, different variable springs and dashpots were used as the middle cushion and ram cushion, a spring was used as pile cushion and a dashpot was used as pile. Numerical solution for the impact force was analyzed by dimensional analysis, the separation of ram from the cushion and the separation of the pile from the pile cushion were considered, the influence of combination pile hammer parameters on impact force was analyzed, and the impact force generated by common pile hammer and combination pile hammer were compared. Results show that the combination hammer structure causes a lower crest and a longer effective impact time as it has more than one force wave.
关键词
有效锤击力 /
组合桩锤 /
量纲分析
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Key words
effective impact force /
combination pile hammer /
dimensional analysis
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胡均平;吴自龙;李科军.
组合桩锤锤击模型的数值分析[J]. 振动与冲击, 2014, 33(17): 111-115
HU Junping;WU Zilong;LI Kejun.
NUMERICAL ANALYSIS FOR IMPACT MODEL OF COMBINATION PILE HAMMER[J]. Journal of Vibration and Shock, 2014, 33(17): 111-115
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