地质雷达及超声横波技术在密集型钢筋混凝土结构检测中的应用

Application of Ground Penetrating Radar and Transverse Wave Reflection Imaging Technology to Detection of Dense Reinforced Concrete Structures

由于密集型钢筋混凝土结构中钢筋反射强,给钢筋及混凝土背后缺陷分析和判定造成了困扰。因此采用适当提高地质雷达天线频率及结合超声横波反射成像技术的措施,来提高对密集型钢筋混凝土结构检测信号的分辨率和判识准确率。首先简单介绍了地质雷达工作原理及钢筋反射示意图,对目前隧道衬砌检测中普遍应用的地质雷达检测信号进行简要说明和对比。然后对采取的两种措施进行介绍,并结合多种密集型钢筋混凝土结构检测实例,着重对管片背后不密实检测做了介绍。结果表明,运用适当提高地质雷达天线频率和超声横波反射成像技术结合的方法对密集型钢筋混凝土结构检测可做出更为准确的分析和判定。

Due to the strong reflection of steel bars in dense reinforced concrete structures,it is difficult to analyze and determine the defects behind steel bars and concrete.The purpose of this paper is to improve the resolution and accuracy of the detection signal of dense reinforced concrete structures.The method is to increase the antenna frequency of ground penetrating radar and the ultrasonic shear wave reflection imaging technology.At first,this paper briefly introduces the working principle of ground penetrating radar and the sketch of steel bar reflection,and briefly describes and compares the GPR detection signals which are widely used in tunnel lining det ection at present.Then the two measures are introduced,combined with a variety of examples of dense reinforced concrete structure detection,and the emphasis is placed on the non-dense detection behind the segment.It turns out that using the method of properly increasing the antenna frequency of ground penetrating radar and ultrasonic shear wave reflection imaging technology to detect dense reinforced concrete structures can make more accurate analysis and judgment.