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Xu, Z.*; Yamachi, Hiroshi*; Sato, Toshinori; Matsui, Hiroya; Itakura, Kenichi*
Doboku Gakkai Rombunshu, F3 (Doboku Johogaku) (Internet), 71(1), p.43 - 55, 2015/10
In the process of underground space development, enormous information is collected in each developing stage, such as investigation, plan, design and construction. It is important to properly feed back these information to design and construction in order to realize rational design and construction of an underground space. And more, these information also become basic data in a plane of structure management. However, it is almost impossible that it is controlled in the individual ability, since collected information quantity is too enormous. For the purpose of intuitively controlling and processing these enormous information, we devised the system for the data management by freely moving in virtual reality space. In this paper, the basic structure of the system constructed by adopting WEB3D and RDBMS, is described, and the practicability is verified.
Xu, Z.*; Itakura, Kenichi*; Yamachi, Hiroshi*; Otsu, Shinichi*; Hayano, Akira; Matsui, Hiroya; Sato, Toshinori
Heisei-24 Nendo (2012 Nen) Shigen, Sozai Gakkai Shuki Taikai Koenshu, p.63 - 66, 2012/09
no abstracts in English
Nakamura, Yasuyuki; Sano, Kazuya; Morishita, Yoshitsugu; Maruyama, Shinichiro*; Tezuka, Shinichi*; Ogane, Daisuke*; Takashima, Yuji*
Journal of Engineering for Gas Turbines and Power, 133(6), p.064501_1 - 064501_3, 2011/06
Times Cited Count：1 Percentile：11.98(Engineering, Mechanical)Abrasive water jet (AWJ), is to shoot the abrasive mixed with high-pressure water to the material for cutting, can cut most materials like metals and concretes in water with long stand-off means the length from the cutting head to the material for cutting. On the other hand, AWJ is required to reduce an amount of the abrasive because it becomes the waste. It is also difficult to monitor the cutting condition by any visual methods like a TV camera in the water becoming cloudy by both used abrasive and cut metal grit. For solving these issues, some cutting tests were conducted and (1) It was possible to predict an optimal supply rate of abrasive by considering the conservation of momentum between the water jet and the abrasive. (2) It was also possible to judge whether the material could be cut successfully or not by detecting the change in the frequency characteristics of vibration or sound caused during the cutting process.
Kurosaki, Yukio*; Yamachi, Hiroshi*; Matsui, Hiroya
JAEA-Research 2008-066, 168 Pages, 2008/09
JAEA-Research-2008-066-1.pdf:21.59MBJAEA-Research-2008-066-2.pdf:45.71MBJAEA-Research-2008-066-3.pdf:18.64MBJAEA-Research-2008-066-4.pdf:3.35MB
Mizunami underground research laboratory planned to excavate to 1000 m depth and now under construction. One of the most serious problems in a greatly deeper shaft is "TAKANUKE" collapse caused by slip movement of large discontinuities. In this report, we have conducted numerical studies using finite difference method in order to throw an objective light on a mechanism of TAKANUKE collapse. These studies show two different stress states in upper and lower side of large discontinuities. In order to evaluate a possibility of TAKANUKE collapse during MIZUNAMI main shaft sinking, we have conducted a particle body analysis as well. A fault with a high strike up to 79 degree, discovered in survey boring at MIZUNAMI site, has a low potential of TAKANUKE collapse during shaft sinking.
Xu, Z.*; Matsui, Hiroya; Sato, Toshinori*; Itakura, Kenichi*; Yamachi, Hiroshi*
Dai-12-Kai Iwa No Rikigaku Kokunai Shimpojiumu Koen Rombunshu (CD-ROM), p.647 - 652, 2008/09
Various data, such as investigation data, design data and/or field measured data arising during a course of the large-scale underground development are possible and important information, which can contribute to not only design and/or construction work but also maintenance of facilities. However, it is difficult to control and properly operate such enormous data throughout a long term included by an operation period of facilities. Authors developed management system for large-scale underground development system which adopted virtual reality technology and RDBMS as one answer for such problem. In addition, this system was applied experimentally to the Mizunami Underground Research Laboratory construction. This paper asks the validity of proposing technique, while the practice of design and mounting of the system is shown.
Nakamura, Yasuyuki; Kikuchi, Koichi; Morishita, Yoshitsugu; Usui, Tatsuo*; Ogane, Daisuke*
Proceedings of 14th International Conference on Nuclear Engineering (ICONE-14) (CD-ROM), 9 Pages, 2006/07
It is necessary to clarify the dismantlement method of 224 double tubes arranging both pressure and calandria tubes concentrically in the reactor as a peculiar problem of Fugen, in the case of phased dismantlement of the reactor. The machine type cutting is desirable, considering the influence on the atmospheres because the double tubes consist of the zirconium alloy and zircalloy material radio activated highly. Besides, Cutting method has long standoff to cut the double tubes at a time for to be short the term of dismantlement. is desirable. Therefore, it was examined to confirm the applicability to the double tubes cutting by abrasive water jet (hereinafter referred to as AWJ) as the machine type cutting method that can take the standoff comparatively longer. As a result, We confirmed for possibility of cutting the double tubes at a time from inside and outside tube, and cutting thick slab by abrasive water jet. Besides, We confirmed for relationship of abrasive supply and cutting velocity, properties of secondly waste.
Katsunuma, Yoshio*; Higuchi, Masanori*; Shiba, Akihiro*; Kataigi, Isao*
JNC TJ7410 2005-011, 64 Pages, 2004/02
JNC-TJ7410-2005-011.PDF:14.94MB
no abstracts in English
Hyodo, Masayuki*; Oga, Kotaro*; Kunimaru, Takanori; Yamamoto, Yoichi*; Sasaki, Katsuji*; Masson, M.*
no journal, ,
no abstracts in English
Hyodo, Masayuki*; Oga, Kotaro*; Kunimaru, Takanori; Yamamoto, Yoichi*; Sasaki, Katsuji*; Masson, M.*
no journal, ,
no abstracts in English
Nakamura, Yasuyuki; Morishita, Yoshitsugu; Kikuchi, Koichi; Usui, Tatsuo*; Ogane, Daisuke*
no journal, ,
As a peculiar issue of the decommissioning of FUGEN, it is necessary to establish a dismantlement method for the reactor having a 224 double-tubes structure arranged with pressure and calandria tubes concentrically. Mechanical cutting method will be desirable considering the influence on the atmospheres because the double-tubes consist of highly activated zirconium alloy and zircalloy material. Therefore, the abrasive water jet method was tested and examined as a mechanical double-tube cutting method that needs the standoff comparatively longer. We confirmed the applicability of the abrasive water jet method to the dismantlement of FUGEN's reactor. According to this cutting test, it is possible to cut slab at ca. 0.3-0.6kg/min of abrasive supply. (abrasive supply of AWJ is generally ca. 1.5-2.0kg/min.) And, 150mm thick of SUS were able to cut in the water by once.
Suyama, Yasuhiro*; Nishikawa, Takeshi*; Tokizawa, Takayuki; Kato, Mitsugu; Kurikami, Hiroshi; Umezawa, Katsuhiro
no journal, ,
no abstracts in English
