混凝土结构缺陷的红外热成像检测识别技术

发布时间：2019-01-30 18:41

【摘要】：根据红外热辐射原理,研发出对混凝土结构主动激励、红外成像采集、红外图像处理分析等设备和系统,并进行了桥梁结构内部空洞病害类等缺陷检测的模型试件试验及公路桥梁实桥试验研究;试验研究表明通过接收来自混凝土表面的热辐射值,可以对其结构内部的缺陷状态作出基本判断。但混凝土结构在无主动激励时,其周围介质的温度差值较小,红外图像不会反映出内部缺陷状态;在对混凝土进行人为主动激励的条件下,结构内部缺陷介质的影响使其产生温度场发生变化,通过自主研发的数字热红外成像仪,采集获得了混凝土表面温度场分布的热像图谱,从而实现混凝土内部缺陷识别判定,不但完成了主动激励的混凝土结构模型试件的试验工作,还成功应用于运营桥梁结构体的缺陷检测工作;采集到桥梁结构表面非常清晰的温度场图谱,实现了对桥梁结构混凝土内部空洞类等缺陷的有效检测和识别。并对内部设有缺陷的模型试件试验及已运营的实桥检测试验对比、分析验证了主动激励红外检测方法的准确性及可靠性,成功攻克了快速检测混凝土内部缺陷病害识别的难题。
[Abstract]:According to the principle of infrared thermal radiation, we have developed equipment and systems for the active excitation of concrete structures, infrared imaging acquisition, infrared image processing and analysis, etc. The model test of defects such as cavity diseases in bridge structure and the experimental study of highway bridge are also carried out. The experimental results show that the internal defect state of concrete can be judged by receiving the thermal radiation from the concrete surface. But when the concrete structure has no active excitation, the temperature difference of the surrounding medium is small, and the infrared image will not reflect the internal defect state. Under the condition of artificial active excitation of concrete, the temperature field is changed by the influence of the defect medium inside the structure, and the digital thermal infrared imager is developed independently. The thermal image of the temperature field distribution on the surface of concrete is obtained, which realizes the identification of the inner defects of concrete, and not only completes the test work of the model specimen of concrete structure under active excitation. It has also been successfully applied to the defect detection of the bridge structure. The temperature field atlas of the surface of the bridge structure is very clear, which realizes the effective detection and recognition of the defects such as the cavities in the concrete structure of the bridge structure. By comparing the model specimen test with internal defects and the actual bridge test, the accuracy and reliability of the active excitation infrared detection method are analyzed and verified, and the difficulty of rapid detection of internal defect detection of concrete is successfully overcome.
【作者单位】：交通运输部公路科学研究院;
【基金】：交通运输部应用基础研究项目(2012319223020)
【分类号】：U446

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