混凝土浅层钢筋对雷达检测的屏蔽作用

Shielding effect of shallow-buried steel bar in concrete on radar detection

采用砂箱模拟混凝土,研究了钢筋直径、间距、目标物深度、水平位置等参数,研究了浅层钢筋屏蔽对雷达检测的影响。经过试验分析,得出了不同目标物深度的情况下,不同浅层钢筋直径与中心距的屏蔽影响区间,并结合电磁波的基本理论,提出了浅层钢筋下雷达法检测混凝土缺陷。结合工程实例,考虑了浅层钢筋较密集的不利情况,通过先行侦测浅层钢筋的位置,优化检测方案,给出了适用于此项目的检测方法。

Using sand box to simulate concrete,considering the diameter,spacing,depth and horizontal position of steel bars,the influence of shallow-buried steel bar shielding on radar detection is studied.Based on the experimental analysis,the shielding influence zone in different diameter of the shallow-buried steel bar and center distance is obtained under the condition of different target depth.Combined with the basic theory of electromagnetic wave,the treatment method of detecting concrete defects by radar under the shallow steel bar is proposed.Combined with an engineering example,considering the disadvantage of dense shallow steel bars,by detecting the location of shallow steel bars in advance and optimizing the detection scheme,the testing method suitable for this project is given.