Central Nippon Highway Engineering Nagoya Co.

Nagoya-shi, Japan

Central Nippon Highway Engineering Nagoya Co.

Nagoya-shi, Japan
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Ito H.,Toyama Prefectural University | Fukada S.,Kanazawa University | Arima N.,Central Nippon Highway Engineering Nagoya Co. | Moriyama M.,Central Nippon Expressway Company Co.
Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure - 5th International Symposium on Life-Cycle Engineering, IALCCE 2016 | Year: 2017

In the sustainable society, concrete structures should retain safety structural performance to the future. When pre-stressed concrete (PC) beam received the chloride attack, the failure of them may occur by steel bar corrosion. In this study, for the purpose of investigating the structural performance decrease by the several deterioration, the loading test of full scale PC T-shape beam and the structural analysis to it were carried out. This PC beam was cut off from existing bridge. In this analysis, the several deterioration scenario of PC beam were prepared. As the result, the load-displacement curve of analysis was similar to experiment curve, when the measurement results such as compressive strength or pre-stressing force were used. Based on the comparisons, it was confirmed that the maximum load was influenced by mass reduction of PC bars. © 2017 Taylor & Francis Group, London.

Arima N.,Central Nippon Highway Engineering Nagoya Co. | Fukada S.,Kanazawa University | Ha M.T.,Kanazawa University | Moriyama M.,Central Nippon Expressway Co. | Miyashita T.,Nagaoka University of Technology
Life-Cycle of Engineering Systems: Emphasis on Sustainable Civil Infrastructure - 5th International Symposium on Life-Cycle Engineering, IALCCE 2016 | Year: 2017

Concrete bridges built in the seaside and frozen environment have been damaged due to the salty attacking. In the health monitoring of these concrete bridges, it is important to evaluate the relationship between the structural performance and the state of destructions in order to conduct maintenance works. In this study, a full scale PCT girder, which was removed at nearly 25-years after construction due to salt damage, have been evaluated to figure out the sensitivity of several damage detection, residual load-bearing capacity and deformations due to destructive test. As a result, even though many damages are observed, the investigated PCT girder performed a sufficient load-bearing capacity. In addition, non-destructive test, i.e. the remaining pre-stress estimation and grout filling, also plays effective role in this study. Furthermore, a novel damage indicator, called Displacement Assurance Criterion (DAC), based on changes of displacement of each observed points, has been taken into consideration and found as the sensitive damage detection approach. © 2017 Taylor & Francis Group, London.

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.

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.

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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