CAJ | 학술논문

针对冲击回波法管道缺陷检测仍不成熟的现状，为解决预应力孔道灌浆质量不易控制的问题，采用应力回波法对预应力钢波纹管的灌浆缺陷进行系统性的试验，提出了缺陷下频谱图中的响应峰值识别的解释方法。结果表明：灌浆饱满的模型厚度频率和实体板基本相同；缺陷的存在或灌浆液的强度不足均使主频向低频漂移；灌浆不足的管道中，冲击点与缺陷的相对位置会对测试结果产生影响，冲击点正对缺陷时的响应频率要低且二者都低于实体板的响应频率；孔道全空和全水的模型频率响应基本相同，由于缺陷位置较浅且尺寸较大，容易造成敲击表面的弯曲振荡，波形相对发散。
침대충격회파법관도결함검측잉불성숙적현상，위해결예응력공도관장질량불역공제적문제，채용응력회파법대예응력강파문관적관장결함진행계통성적시험，제출료결함하빈보도중적향응봉치식별적해석방법。결과표명：관장포만적모형후도빈솔화실체판기본상동；결함적존재혹관장액적강도불족균사주빈향저빈표이；관장불족적관도중，충격점여결함적상대위치회대측시결과산생영향，충격점정대결함시적향응빈솔요저차이자도저우실체판적향응빈솔；공도전공화전수적모형빈솔향응기본상동，유우결함위치교천차척촌교대，용역조성고격표면적만곡진탕，파형상대발산。
On the present situation that impact echo method was not immature for the pipeline defects test,it was difficult to control the quality of prestressed duct grouting, the stress echo method was carried out in systemic experiment of the prestressed steel pipe grouting. Interpretation method to recognize the response peak under the frequency spectrogram with defects was put forward. Results indicate that:frequency on the full grouting model was similar to the solid slab;defects or insufficient strength in grouts could make dominant frequency drifting to low frequency;in the pipes lack of grouts,the location of shock points and defects could influence the testing results,response frequency would be low when shock points right on the defects,and both the conditions frequency was lower than the solid slab;response frequency on the empty pipe model was similar to the pipe full of water,because the defects were shallow and big,it was easy to cause the curve oscillatory when knocking on the surface, and waveforms relatively diffused.