Post-installed adhesive anchor bolts are commonly used on all types projects, from standard buildings to bridges and nuclear power plants. They are exposed to varying and diverse environmental conditions which are significant successfully to make connections to concrete structures for many years. In order to maintain the safety and reliability of concrete structures such as buildings or bridges on higher level over a long period time, we developed a new non-destructive inspection system of adhesive an...
英字タイトル:
Development of non-destructive inspection technique for adhesive anchor bolts using AE sensor (1) An experimental approach

We have developed a non-destructive inspection technique using the AE (acoustic em sion) sensor. It is intended to be non-destructive evaluation in soundness of the adhesion anchor is installed in a nuclear power plant. We analyzed the Eigen frequ cy of the adhesive anchor measured by the AE sensor using a finite element method . Results of the analysis of the Eigen frequency, the change in Eigen frequency cou ld be confirmed between the adhesive anchor which simulates the Peeling of the resi n by aging de...
英字タイトル:
Development of non-destructive inspection technique for adhesive anchor bolts using AE sensor (2) Theoretical examination

A new non-destructive inspection technique with using acoustic emission (AE) sensor was developed for the purpose of overcoming problems originating in existing hammering test. The new technique enables us to obtain inspection results with no dependence on personal skills of a checker, and to judge the integrity of the bolts based on quantitative measurement results. The investigation of applying the new method to mechanical anchor bolts is reported. From experimental results by using this technique, ...
英字タイトル:
Development of non-destructive inspection technique for mechanical anchor bolts using AE sensor

１．緒言 原子力発電所では、多数の基礎ボルトや配管が用いられている。これらの基礎ボルトや配管などの鋼棒、鋼管は、周辺環境（設置場所や内部流体、機械振動など）により経年劣化（腐食、摩耗、き裂など）が発生する可能性が潜在している1-2。従って、機器・構造物の安全性・信頼性を確保する観点より、鋼棒、鋼管の経年劣化を検出する非破壊検査技術が望まれている。 このような鋼棒、鋼管の健全性を検査する手法として、一般的には、目視検査や打音検査、超音波検査が採用されている3-7。しかしながら、目視検査では、たとえば基礎ボル......
英字タイトル:
Development of a new inspection system for steel rod and pipe using AE sensor (1) Experimental approach

A new inspection technique using AE (acoustic emission) sensor has been developed for the purpose of evaluating the integrity of steel rods and pipes, and sensitivity analyses were made for degradations of steel rods and pipes from a theoretical viewpoint. The Eigen frequency and modal frequency response analysis were conducted based on FEM (finite element method). Several peaks due to natural vibrations were observed in the frequency distribution calculated in this study, and comparisons with experi...
英字タイトル:
Development of a new inspection system for steel rod and pipe using AE sensor (2) Theoretical approach

A new non-destructive inspection technique with using acoustic emission (AE) sensor for mechanical anchor bolt was developed for the purpose of overcoming problems originating in existing hammering test. The new technique enables us to obtain inspection results with little dependence on personal skills of a checker, and to judge the integrity of the bolts based on quantitative measurement results. The detectability to crack width on concrete was reported. From experimental results by using this techni...
英字タイトル:
Development of non-destructive inspection technique for mechanical anchor bolts using AE sensor 2

Non-destructive testing technique was developed for embedded hardware using acoustic emission sensors. In this technique, AE sensor records the acoustic vibration generated by striking the embedded hardware with a hammer. The fixed state of the embedded hardware is judged from the vibration time of the embedded hardware recorded by the AE sensor and the frequency distribution of the acoustic signal. Mockup tests and FEM analysis were carried out in order to verify the effectiveness of the technique....
英字タイトル:
Embedded hardware inspection using AE sensor Part1 Mockup tests

Non-destructive testing technique was developed for embedded hardware using acoustic emission sensors. In this technique, the fixed state of the embedded hardware can be judged from the vibration time and the frequency distribution of the acoustic signal. In this report, we introduce inspection method and analysis method at site and the application result of JNFL by nondestructive inspection technology of embedded hardware using AE sensor....
英字タイトル:
Embedded hardware inspection using AE sensor Part2 Site inspection

The maintenance of valves used in nuclear facilities (check valves, ball valves, gate valves, butterfly valves, etc.) is carried out by daily checking and overhaul. However, it is not easy to diagnose the inside status of these valves such as open-close performance and internal leakage. In this report, our approaches are shown to develop valve diagnosis by acoustic measurement using AE (Acoustic Emission) sensor through test loop examinations and the field applications....
英字タイトル:
Development of valve diagnosis using AE sensor

A new inspection technique using AE (acoustic emission) sensor has been developed for the purpose of evaluating the integrity of steel rods and pipes, and sensitivity analyses were made for degradations of steel rods and pipes from a theoretical viewpoint. Inner surface corrosion model of the piping changing the corrosion contents were simulated frequency distribution by dynamic analysis using the finite element method, and comparisons with experimental results obtained from mockups with simulated degr...
英字タイトル:
Development of a new inspection system for steel rod and pipe using AE sensor 2 (2) Theoretical approach