冲击回波波动能量法在某水电站钢管脱空缺陷检测中的应用  

Application of Fluctuation Energy Method of Impact Return Wave in Detection of Penstock Cavity

作　　者：李平宏[1] 常兴兵 沈建民[2] 李洪[1] 

机构地区：[1]中国电建集团西北勘测设计研究院有限公司工程实验检测分院,西安710043 [2]中国电力工程顾问集团中南电力设计院,武汉430070

出　　处：《西北水电》2015年第4期31-34,共4页Northwest Hydropower

摘　　要：水工地下压力管道在施工过程中,钢管与外包混凝土之间容易形成脱空缺陷。以往通常采用冲击回波法对信号时域及频域进行分析,评价钢管与混凝土的脱空缺陷。由于压力钢管较薄,信号识别与分析较为困难,影响该方法的应用。文章介绍了采用检测冲击回波波动能量的方法进行钢管缺陷评价的原理、方法及应用实例,弥补了冲击回波法采用时域及频域信号进行缺陷判定方法中的不足。Cavity between penstock and external concrete envelopment easily occurs in penstock construction. Conventionally, the impact return wave method is applied for analysis of time and frequency ranges of signals to assess the cavity between penstock and concrete. As the penstock wall is thin, it is difficult to identify and analyze signals. The method application is affected. In this paper, principle, meth- ods and practice of application of the detection of the fluctuation energy of the impact return wave to assess the penstock defect are intro- duced. It enriches the impact return wave method in terms of time and frequency ranges for defect determination.

关 键 词：冲击回波 钢管 波动能量 脱空缺陷 

分 类 号：TV698.15[水利工程—水利水电工程] TG115.28[金属学及工艺—物理冶金]