利用阻尼振动法检测套筒灌浆饱满度的可行性分析

Feasibility Analysis of Using Damping Vibration Method to Detect the Plumpness of Sleeve Grouting

目的 研究阻尼振动法对灌浆料初凝前后及灌浆口各类灌浆缺陷的检测能力。方法 设计并制作两组装配式混凝土桥墩套筒节点模型,并在套筒中设置了不同种类的缺陷,根据阻尼振动衰减原理对灌浆饱满度进行判断。结果 传感器暴露在空气中时,仪器检测到的振动幅值为255,当灌浆料饱满时,仪器检测到的振动幅值普遍低于100,大概保持在20~60;随着灌浆料的固化,振动幅值继续变小,大概保持在10~40。因此可知,当传感器被灌浆料包裹时,振动能量值小于100便可判定该套筒灌浆饱满。结论 通过对比传感器振幅能量值与预设的灌浆情况,证实了阻尼振动法的可行性,对于脱空类型的缺陷有着较好的检测效果。

This paper focuses on the detection ability of the damped vibration method on various types of grouting defects before and after the initial setting of grout and at the grouting opening.The experimental method is to design and produce two groups of assembled concrete pier sleeve node models,and set up different kinds of defects in the sleeve,according to the principle of damped vibration attenuation to judge the grout fullness.The results are as follows,when the sensor is exposed to the air,the vibration amplitude detected by the instrument is 255,when the grout is full,the vibration amplitude detected by the instrument is generally lower than 100,roughly maintained at 20~60;with the curing of grout,the vibration amplitude continues to become smaller,roughly maintained at 10~40,so it can be seen that,when the sensor is wrapped by the grout,the vibration energy value of less than 100 can be determined The sleeve is fully grouted.Conclusion By comparing the sensor amplitude energy value with the preset grouting condition,the feasibility of the damped vibration method is confirmed,and it has a better detection effect for the defects of dehollowing type.