基于改进冲击回波法的装配式混凝土桥墩套筒灌浆检测理论研究

Grouting Detection Theory of Assembled Concrete Pier Sleeve Based on Shock-echo Method

目的研究不同纵向缺陷长度的冲击回波法,改进后的冲击回波法提高了装配式混凝土桥墩模型的检测精度,解决装配式混凝土墩套中注浆缺陷的问题。方法分析10个不同纵向全空隙缺陷长度参数的装配式混凝土桥墩模型,设计各套筒灌浆缺陷长度,分析不同试验位置ABAQUS Explicit显示动态,频域信号可以从时域信号数据得到。结果注浆全模型谱图A中1处优频峰值f=0.9183 kHz,未注浆模型J的频谱图中存在2个优良频率峰值,分别是6.5854 kHz和19.7561 kHz。纵向缺陷长度比套筒长度大20%和套筒长度为10%的全空缺陷可以被厚度频率准确识别,厚度频率在0~100 mm内能准确识别缺陷。结论提高套筒灌浆饱满度检测精度的方法准确可靠,能够满足理论分析、计算精度和工程实际误差的要求。

An impact echo method with different longitudinal defect lengths is studied to improve the detection accuracy in an assembled concrete pier model so as to solve a problem in the defect detection of the assembled concrete pier sleeve grouting.Ten prefabricated concrete bridge pier models with different longitudinal full void defect length parameters were designed,the defect length of each sleeve grouting was set,and the dynamic display of ABAQUS Explicit at different test positions was analyzed.The frequency domain signal could be obtained from the time domain signal data.In the spectral figure A of the whole grouting model,there is one optimal frequency peak(F=0.9183 kHz).In the spectral figure of the non-grouting model J,there are two excellent frequency peaks,which are F=6.5854 kHz and F=19.7561 kHz respectively.When the longitudinal defect length is 20%larger than the sleeve length and the sleeve length is 10%,the all-empty defect can be accurately identified by the thickness frequency,and the thickness frequency can be accurately identified within 0~100 mm.So the method to improve the detection accuracy of sleeve grouting plumpness is accurate and reliable,and can meet the requirements of theoretical analysis,calculation accuracy and engineering actual error.