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Tanizaki T.,Nagoya Electrical Works Co. | Ueda K.,Daido University | Murabe T.,Central Nippon Highway Engineering Nagoya Co. | Nomura H.,University of Electro - Communications | Kamakura T.,University of Electro - Communications
IEEJ Transactions on Industry Applications | Year: 2013

Traffic regulations mandate the use of winter tires in the interests of smooth traffic flow during heavy snow days. In this situation, road administrators must visually inspect vehicles to ensure summer tires are not being used on expressways. However misjudgment is unavoidable only by visual inspection and heavy traffic jams eventually occur. To avoid such traffic jams, an automatic tire discrimination system is required. In this report, we propose a simple method of discrimination between summer and winter tires using tire/road noises emitted by running vehicles, and evaluate the relationship between road surface roughness and the impact noise patterns of winter tires. Additionally, we consider the influence of road surface conditions such as dry and wet surfaces on the proposed discrimination method. Finally, we confirm the effectiveness of the discrimination system in the field using a number of vehicles with different tires. © 2013 The Institute of Electrical Engineers of Japan.


Kosaka T.,Dia Consultants | Hayashi H.,Japan Civil Engineering Research Institute for Cold Region | Kawaida M.,Central Nippon Highway Engineering Nagoya Co. | Teerachaikulpanich N.,Thai Maruyama Industry Co.
15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability | Year: 2015

The problems of embankment construction over peat ground with high water content mostly relates to stability, and long-term settlement. Vacuum consolidation method is commonly used to assist the embankment construction over the soft ground for the purpose of accelerating a consolidation process as well as increasing an overall stability of soft ground for a rapidly embankment construction. Theoretically, the vacuum pressure is considered to be a surcharge load applying to the ground. This load will be removed immediately after the termination of vacuum operation. Basically, the settlement after construction can be minimized by waiting the primary consolidation process to complete at the higher degree prior the removal of surcharge resulting in the increase of over consolidation ratio. Nevertheless, the effect of vacuum consolidation as a surcharge load related to a long-term settlement characteristic has not been clearly investigated. This paper presented the measurement of the long-term settlement after the embankment constructions over peat ground assisted by vacuum consolidation. The effect of vacuum operation period was observed based on the field monitoring data. Moreover, the effect of surcharge by embankment and vacuum consolidation method was also studied and compared. It was found that the increasing vacuum pumping period and increasing the amount of surcharge by vacuum consolidation gave a very good performance to reduce the long-term settlement after the construction.


Tanizaki T.,Nagoya Electrical Works Co. | Ueda K.,Daido University | Murabe T.,Central Nippon Highway Engineering Nagoya Co. | Nomura H.,University of Electro - Communications | Kamakura T.,University of Electro - Communications
Applied Acoustics | Year: 2014

During the winter, traffic regulations state that automobile drivers must use winter tires on unsafe roads such as snowy expressways. The present report is concerned with the development of an automatic tire identification system that can discriminate winter tires from summer tires with high accuracy. The system detects the impact vibration signal that is specifically generated by winter tires when tread blocks with wide grooves strike the road surface during rolling. The signal is picked up by a commercially available vibration sensor. If the signal contains specified impact frequency components, the tire is judged to be a winter tire. Compared with the previous identification system, which used airborne tire/road noise, the proposed system has two advantages. First, it is unaffected by meteorological factors such as wind noise. Second, the proposed system performs well even when the target vehicle is traveling at low speed. We evaluate the performance of the system outdoors using a number of vehicles with various tires and demonstrate an overall improvement in identification accuracy for vehicles traveling at low or moderate speeds. © 2014 Published by Elsevier Ltd.


Suzuki T.,Central Nippon Expressway Company Ltd | Moriyama M.,Central Nippon Expressway Company Ltd | Hira T.,Central Nippon Highway Engineering Nagoya Ltd. | Kimura S.,Kanazawa Institute of Technology
Life-Cycle of Structural Systems: Design, Assessment, Maintenance and Management - Proceedings of the 4th International Symposium on Life-Cycle Civil Engineering, IALCCE 2014 | Year: 2015

In the operation and management of expressways, it is of importance to specify the service level in consideration of safety, reliability, and comfort of expressways, and achieve that level. The service level of structures constituting expressways, such as bridges and tunnels, as well as facilities will become clear once performance requirements are established. Moreover, achievement of the service level will be possible by understanding system risks through the clarification of the relationship between individual structures and facilities, and then developing an overall management system and reinforcing the system for its continued improvement. Focusing on tunnel structures on expressways and the related facilities, this paper proposes a method for setting performance requirements for tunnel structures and facilities in accordance to the service level of expressways as well as a method for analyzing system risks using the established performance requirements. © 2015 Taylor & Francis Group, London.


Aoyama M.,Central Nippon Highway Engineering Nagoya Co Ltd | Miyazato S.,Kanazawa Institute of Technology | Kawamura M.,Kanazawa University
International Journal of Corrosion | Year: 2014

Chloride induced-corrosion of steel bars in concrete can make cracks and exfoliation in near-surface regions in reinforced concrete structures. In this paper, we described the basic concept and practice of steel bars corrosion protection method by the combination of galvanic anode (zinc wire) and the penetration of nitrite ions from mortar layers containing a large amount of lithium nitrite. © 2014 Minobu Aoyama et al.


Hirano S.,Kanazawa Institute of Technology | Miyazato S.,Kanazawa Institute of Technology | Ishikawa T.,Kanazawa Institute of Technology | Aoyama M.,Central Nippon Highway Engineering Nagoya Co.
Advances in Concrete Structural Durability - Proceedings of the 2nd International Conference on Durability of Concrete Structures, ICDCS 2010 | Year: 2010

With regard to the Chloride induced corrosion of an antifreezing admixture, the provision of chloride ions differs by season. In winter, more chloride ions flow into concrete structures and in other seasons they flow out of the structures or infiltrate into them because conditions are constantly changing back and forth from wet to dry. For this reason, by creating sample concrete structures with different portions of water ccmcnt ratio and sample restoration materials for the sections of the structures, we conducted a simulation experiment of the environment of a concrete structure with antifreezing admixture spread and examined the characteristics of chloride ions due to the agent. We cleared that approximately 20% of the chloride ions that had infiltrated into the concrete structure during the winter flow out before the next winter season and that the surface chloride ion content (Co) and diffusion coefficient of chloride ions (Dc) differ according to the measuring time. ©2010 by Hokkaido University Press All rights reserved.


Ya S.,Aichi Steel | Ya S.,Nagoya University | Yamada K.,Nagoya University | Yamada K.,Central Nippon Highway Engineering Nagoya Co. | And 2 more authors.
Journal of Bridge Engineering | Year: 2011

This study reported fatigue test results of 300-mm-wide specimens with three details: 80% partial joint penetration (80%PJP), weld melt-through (WMT), and both. The specimens were cut out from full-scale orthotropic deck specimens of 16-mm-thick deck plate. In the fatigue test, the deck plate was subjected to cyclic bending loading and the rib was free from loading. The fatigue fracture surfaces showed that the presence of WMT may affect the initiation of fatigue cracks. A propensity to root cracking rather than toe cracking was observed. Plotting fatigue test results in an S-N diagram showed that the specimens with WMT seemed to have slightly lower fatigue strengths than the 80%PJP specimens, but the difference is more likely to be within a usual scatter of test data, which means that both details have comparable fatigue strength. The present test results satisfied the S-N curves of JSSC-E (80MPa at 2106 cycles) or AASHTO-C (89MPa at 2106 cycles). © 2011 American Society of Civil Engineers.


Kawasaki K.,Nagoya University | Ut H.D.,Central Nippon Highway Engineering Nagoya Co. | Matsuno T.,Nagoya University | Fukumoto T.,Nishimatsu Construction Co.
Proceedings of the Coastal Engineering Conference | Year: 2012

In this paper, a 3-D multiphase flow model with solid-gas-liquid interaction, named 'DOLPHIN-3D', is utilized to numerically investigate the characteristics of pressure acting on a floating panel, which is installed in front of an upright seawall for wave overtopping reduction. The validity and utility of the model were confirmed through good agreements between the numerical results and experimental ones in terms of the dynamic response of the floating panel and the pressure at the bottom of the panel. The numerical results revealed that the model can appropriately simulate the pressure acting on the floating panel as well as the dynamic behavior of the panel under wave action.


Nakamura T.,Nagoya University | Sawa Y.,Central Nippon Highway Engineering Nagoya Ltd. | Mizutani N.,Nagoya University
Coastal Engineering Journal | Year: 2016

Bridge superstructures were washed away in the 2011 Tohoku earthquake tsunami. To determine whether and when bridge superstructures are washed away, it is essential to evaluate the temporal change in horizontal and vertical tsunami forces. In this study, tsunami force acting on bridge superstructures and its estimation formulae are investigated from hydraulic model experiments and numerical simulations. From experimental results, it is found that it can be determined from a comparison between the temporal change in horizontal tsunami force and that in static friction force taking into account vertical tsunami force whether and when a bridge superstructure move. Furthermore, a drag force equation with the projection area taking into account water surface elevation and a Morison equation in which inertia force is added to the drag force equation are proposed for horizontal tsunami force, and an estimation formula composed of buoyancy force and downward lift force is proposed for vertical tsunami force. From a comparison with numerical results, it was revealed that the estimation formulae can predict the temporal change in the horizontal and vertical tsunami forces except for short wave period, suggesting that it can be evaluated using the estimation formulae whether and when a bridge superstructures moves. © 2016 © The Author(s)


Shintaku A.,Central Nippon Expressway Company Ltd | Okubo F.,Central Nippon Highway Engineering Nagoya Company Ltd
19th Intelligent Transport Systems World Congress, ITS 2012 | Year: 2012

Ichinomiya traffic control centre operates 12 expressways of 822 km which has various characteristic s in Tokai area. These expressways passing urban and rural area have more than 600 CCTV cameras on those routes. Although the traffic control officers in the control centre need to deal with various traffic events quickly, some of them don't have experience enough to manage that. In order to support such officers, the image processing detection system has been installed in some part of the expressways, e.g. tunnel. In addition, some companies have developed technologies of image processing to detect emergency events. However, those developing system and developing functions don't work efficiently very much because developers and manufacturers don't know the true needs for the traffic control centre. The road operating company usually make a request for accuracy of count the number of the car and accuracy of the detecting speed when they give out the order. There are not enough specifications and requirements for detecting the emergent event and they don't have the way to verify them. In addition, the road operating companies didn't give them the information in the traffic control centre for security and difficulty to coordinate one with other authorities. This paper reports what traffic control officers want to know quickly the most when traffic accidents occur, in other words which detection of image processing is really helpful, and which detect function should be developed for them. Moreover, this report disclose the information of the traffic control manager's demand, the information become a key to improve the human-machine interface of the control system.

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