scholarly journals POSSIBILITY ON SUBSTITUTION CLOSE VISUAL INSPECTION FOR IMAGING TECHNOLOGY TO TUNNEL LINING HEALTH MONITORING

2020 ◽  
Vol 76 (1) ◽  
pp. 62-78
Author(s):  
Shinobu KAISE ◽  
Tetsuo ITO ◽  
Yoshikatsu MAEDA ◽  
Hiroshi YAGI ◽  
Kouki MAEDA ◽  
...  
Keyword(s):  
Health Monitoring ◽  
Visual Inspection ◽  
Tunnel Lining ◽  
Imaging Technology

Wireless Structural Health Monitoring Using MEMS

2005 ◽  
Vol 293-294 ◽  
pp. 625-634 ◽  
Author(s):  
Markus Krüger ◽  
Christian U. Grosse ◽  
Pedro José Marrón
Keyword(s):  
Structural Health Monitoring ◽  
Monitoring System ◽  
Health Monitoring ◽  
Visual Inspection ◽  
Microelectromechanical Systems ◽  
Life Time ◽  
Building Structures ◽  
Wireless Monitoring ◽  
Structural Health ◽  
Reliability And Robustness

So far, the inspection of building structures and especially of bridges is mainly done visually. Therefore, the condition of the structure is examined from the surface and the interpretation and assessment is based on the experience of the expert. However, the main purpose of monitoring civil structures is not to substitute visual inspection. Continuous structural health monitoring should provide data from the inside of a structure to better understand its structural performance and to predict its durability and remaining life time. Monitoring should render objective data and observable alterations in the structure continuously, which cannot be done by visual inspection. More detailed information is needed with respect to different exposure due to dynamic and static loads and also temperature and moisture. Today mainly wired monitoring systems are used to monitor structures, which are relatively expensive and time consuming to install. In this paper the basic principle of a wireless monitoring system equipped with MEMS sensors is presented, which can be easily installed at different structures. Microelectromechanical systems (MEMS) are small integrated devices or systems that combine electrical and mechanical components. A wireless monitoring sensor network equipped with such MEMS could be produced with a very low budget and becomes very efficient. This permits a wide area of applications not only in civil engineering. With respect to different applications relevant properties of a wireless monitoring system are described. In detail network configuration, power consumption, data acquisition and data aggregation, signal analysis and data reduction as well as reliability and robustness are discussed.

scholarly journals A New Health Assessment Index of Tunnel Lining Based on the Digital Inspection of Surface Cracks

2017 ◽  
Author(s):  
Xuezhen Wu ◽  
Yujing Jiang ◽  
Jianhua Wang ◽  
Kusaba Masaya ◽  
Tetsuya Taniguchi ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Visual Inspection ◽  
Crack Density ◽  
Health Assessment ◽  
Tunnel Lining ◽  
New Method ◽  
Inspection Method ◽  
Assessment Index ◽  
Comparative Tests ◽  
The Stability

The stability assessment of aged tunnel linings were mainly evaluated based on the visual inspection, and the Tunnel-lining Crack Index (TCI) is one of the most widely used tunnel lining health assessment indexes in Japan. However, the intersection and distribution of cracks, which can influence the stability of tunnel lining greatly, were not considered in the TCI. A new method was proposed for the health assessment of tunnel lining, which evaluate the lining states according to the fractal dimension of cracks. Based on the machine vision-based method, the crack image can be extracted efficiently. The fractal dimension of lining cracks in one span can be obtained in a few minutes. A series of comparative tests and field tests were conducted to evaluate the validity of this new method. The comparative tests confirmed that fractal dimension can characterize the density, width, and distribution of cracks. The results also certificated that the influence of crack width is larger than the crack density. The intersection of cracks, which will increase the risk of lining collapse, can also increase the fractal dimension, whereas the TCI keep constant. The fractal dimensions of tunnel lining cracks were obtained according to the digital inspection test of Hidake Tunnel in Japan for all the 65 spans. Moreover, the TCI was obtained through statistical methods. The correlation between fractal dimension and TCI of tunnel lining was studied. The significance of the new evaluation index is that it can identify some unusual spans of tunnel lining and provide a basis for further internal testing. As a complement to the conventional visual inspection method, the fractal dimension of the cracks is a promising health assessment index.

Inspection Test of a Tunnel with an Inspection Vehicle for Tunnel Lining Concrete

2019 ◽  
Vol 31 (6) ◽  
pp. 762-771 ◽  
Author(s):  
Satoru Nakamura ◽  
Atsushi Yamashita ◽  
Fumihiro Inoue ◽  
Daisuke Inoue ◽  
Yusuke Takahashi ◽  
...  
Keyword(s):  
Visual Inspection ◽  
New Technology ◽  
Tunnel Lining ◽  
Road Tunnel ◽  
Traffic Regulation ◽  
Tunnel Inspection ◽  
Infrastructure Maintenance ◽  
Periodic Inspections ◽  
Vast Area

Users of bridges and tunnels are generally concerned about the aging of these structures. Periodic inspections are necessary to keep old bridges and tunnels healthy. Inspection engineers must approach the inspection points as close as possible by mobile elevating of the work platform for close visual inspection of lining concrete. The inspection of a road tunnel particularly requires traffic regulation. Furthermore, it takes much time to perform visual inspection and hammering test for the vast area. Moreover, the inspection results have variations by inspectors. We propose an “Inspection Vehicle” for inspection of tunnel lining concrete by a new technology for infrastructure maintenance. This study reports the finding on element technology of an inspection vehicle and applies a tunnel inspection test.

scholarly journals Study on the Correlation of Vibration Properties and Crack Index in the Health Assessment of Tunnel Lining

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Xuezhen Wu ◽  
Yujing Jiang ◽  
Kusaba Masaya ◽  
Tetsuya Taniguchi ◽  
Takahide Yamato
Keyword(s):  
Visual Inspection ◽  
Health Assessment ◽  
Tunnel Lining ◽  
New Method ◽  
Ambient Vibration ◽  
Ambient Vibration Test ◽  
Inspection Method ◽  
Vibration Properties ◽  
Average Spectrum ◽  
Crack Index

This paper examines the correlation of vibration properties and crack index of tunnel lining in evaluating risk of collapsing. The visual inspection method, which was widely used, was not reliable enough as the stability of tunnel lining was influenced by the voids and the cracks that were invisible. A new method for the health assessment of tunnel lining was proposed, which can evaluate the whole structural condition according to the vibration properties of tunnel lining. A series of field tests were conducted to evaluate the validity of this new method and to make a comparative analysis with the visual inspection test results. The resultant average spectrum (RAS) of tunnel lining was identified according to the acceleration data of ambient vibration test of Hidake Tunnel in Japan. The tunnel lining crack index (TCI) was also obtained by digital visual inspection test. The correlation between the vibration characteristics and the crack index of tunnel lining was confirmed. However, the voids and the cracks on the inside of the lining were neglected in visual inspection test, which could pose a serious threat to tunnel safety. The vibration measurements by seismometer are an effective way to evaluate the global stability of tunnel lining.

Development of Inspection System for Crack in R.C. Tunnel Lining by Using Knowledge-Based System (KBS)

2012 ◽  
Vol 622-623 ◽  
pp. 1415-1420
Author(s):  
Yousif A. Mansoor ◽  
Zhi Qiang Zhang
Keyword(s):  
Expert System ◽  
Knowledge Base ◽  
Visual Inspection ◽  
Tunnel Lining ◽  
Inspection System ◽  
Knowledge Based Systems ◽  
System Environment ◽  
Periodic Inspection ◽  
Knowledge Based ◽  
Satisfactory Answer

Over the last several years, many concrete tunnels have been constructed for roads, highways, and railways. For safety in concrete tunnel, periodic inspection has been conducted using many testing technologies and techniques. However, these technologies cannot replace visual inspection because of their slow and complicated procedures. For this reason, the Knowledge-Based Systems (KBS) are used to diagnose R.C tunnel lining crack damage (DICRCTL). In this paper, we attempt to propose an alternative to the human expert, to give technical decisions in diagnosing crack damages in second segment of R.C. tunnel lining. To overcome this requirement, an expert system is developed to achieve the research aim. This proposed system was constructed on a knowledge base that incorporates with the gathered information in the form of rules which is suitable to implement in an expert system environment to diagnostic advisory nature. The proposed application results show an easy, fast and satisfactory answer to engineering needs.

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