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Research on Noncontact Nondestructive Testing Method of Concrete Structure Using Shock Wave

混凝土结构冲击波非接触无损检测方法研究

基本信息

批准号：
14550465
负责人：
MORI Kazuya
金额：
$ 1.79万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

The target of this research was development of a shock wave generation device that was able continuously to generate shock wave. This target was scheduled to be achieved in the plan at first with a pneumatic valve. A pneumatic valve is a device that opens and shuts the valve at high speed by using compress air, and generates shock wave.However, it turned out air full to the pressure vessel to require time in the case with a pneumatic valve. Then, we changed the method to generate shock wave from the pneumatic valve to the combustion type shock tube. The mixture gas of propane gas and air is made to react explosively, and shock wave is generated.The shock wave generation device of the combustion type that had the mixing, combustion chamber and the shock wave inducement room was developed with an acrylic pipe of 30mm in the inside diameter and 50mm in the outside diameter. The plug was installed in the combustion chamber to ignite.A wall was put from the point of the shock tube on the position at 500mm, and the pressure change on the surface was measured. The shock wave of about 4kPa was able to be confirmed. In addition, defect detection test was performed by using a concrete wall with an artificial defect. The defect up to 50mm in depth was able to be detected of 200mm in the diameter.The above-mentioned result was presented in the 1st ESHP Symposium in March, 2004. In addition, the contribution is being prepared for Japan Society of Mechanical Engineers now.

这项研究的目标是开发一种能够连续产生冲击波的冲击波发生装置。这个目标在计划中最初是通过气动阀来实现的。气动阀门是一种利用压缩空气高速打开和关闭阀门并产生冲击波的装置。然而，在使用气动阀门的情况下，将空气充满到压力容器中需要时间。然后，我们将产生冲击波的方式从气动阀改为燃烧式激波管。使丙烷气和空气的混合气体发生爆炸反应，产生冲击波。采用内径30mm、外径50mm的亚克力管，开发了具有混合室、燃烧室和冲击波诱发室的燃烧式冲击波发生装置。将塞子安装在燃烧室内进行点火，在距离激波管点500mm的位置放置一堵墙，测量表面压力变化。能够确认约4kPa的冲击波。另外，使用具有人工缺陷的混凝土墙进行了缺陷检测试验。能够检测到直径200mm的深度达50mm的缺陷。上述结果已在2004年3月的第一届ESHP研讨会上发表。此外，目前正在为日本机械工程学会准备投稿。