Tokyo Metro Co.

Taitō-ku, Japan

Tokyo Metro Co.

Taitō-ku, Japan
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Kamei K.,Tokyo Metro Co. | Ahn T.-H.,Hanyang University | Park J.-H.,Chiyoda Corporation | Hashimoto T.,Tokyo Institute of Technology | And 2 more authors.
High Tech Concrete: Where Technology and Engineering Meet - Proceedings of the 2017 fib Symposium | Year: 2017

In this research, the application of repair methods of water leakage cracks using self-healing technologies for subway tunnels is presented from the Tokyo Metro (Subway) system. From the previous researches, effects of quick setting agents and water-stop agents with self-healing agents were investigated under various crack repair methods such as surface treatment repair method, injection method and V-cut repair method. The results showed that the proposed water leak repair methods using self-healing repair materials were effective under the subway tunnel conditions. Furthermore, experiments of new patching mortars including self-healing agents were conducted for performance estimations in the laboratory and field application. In order to apply these new repair materials in subway tunnels, water leakage cracks with Maximum 1.5 mm width from wall or ceiling of subway tunnels were selected. And then, new two repair construction method using quick setting agents and patching mortars were conducted. From these results, it was also confirmed that the sealing effects of water leakage through the penetrating cracks from these tests could be improved by inorganic repair materials with self-healing capability. Especially, these patching mortars were fully satisfied with the Tokyo metro's repair materials standard code such as early and long term strength, the higher resistance of mass transfers compare to existing repair materials. Therefore, it is considered that the utilization of self-healing agents has a high potential for one of new repairing methods of cracked concrete under the water leakage for subway tunnels. The long term durability will be monitored continuously and studied. © Springer International Publishing AG 2018.


Mutou Y.,Tokyo Metro Co.
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

Tokyo Metro Co., Ltd. (Tokyo Metro) operates a subway network with nine lines over a total distance of 195.9 km in the Tokyo Metropolitan area, the world’s most massively urbanized area. The subway network provides services for 6.44 million passengers a day. Subway’s infrastructure development, and operation and management are undertaken by the same entity, that is, train operations and facilities management are integrated. This paper describes the maintenance of tunnels, including the Ginza Line, in which the Ueno - Asakusa section was opened for service in 1927 (the whole line opened in 1939). © 2015 Taylor & Francis Group, London.


Tashiro Y.,Tokyo Metro Co. | Mutou Y.,Tokyo Metro Co.
Underground - The Way to the Future: Proceedings of the World Tunnel Congress, WTC 2013 | Year: 2013

Earthquakes and typhoons cause flood damage in Japan, every year, and it is not unusual for such damage to occur in the Tokyo Metropolis. In this context, structures must be designed to be capable of withstanding natural disasters. In the case of tunnel fires, measures must be taken inside because evacuation routes are limited and people could easily be asphyxiated. The number of passengers on the subway routes operated by Tokyo Metro exceeds six million per day, which means that disaster-prevention measures implemented directly protect the lives of very large numbers of people. This paper introduces the disaster preventive measures adopted for urban tunnels, specifically, measures undertaken by Tokyo Metro against fires, earthquakes, and floods. © 2013 Taylor & Francis Group.


Numata A.,Tokyo Metro Co. | Hirano T.,Tokyo Metro Co.
Underground - The Way to the Future: Proceedings of the World Tunnel Congress, WTC 2013 | Year: 2013

The Tozai Line connecting Chiba Prefecture and Tokyo currently reaches a peak congestion rate of 200% during the morning rush hours. This makes it the most crowded line in the 195.1-km Tokyo Metro subway network. The extreme crowding on the platforms, which has become the norm, leads to substantial delays of train operation during the morning rush hours. This poses problems for safe and stable operation, and full-scale corrective measures are needed. To relieve the congestion, Tokyo Metro is, undertaking large-scale improvement work to improve existing stations in order to provide more convenient subway services and thereby contribute to establishing an affluent society for the future. This paper reports on the content and methods adopted for the improvement work. © 2013 Taylor & Francis Group.


Hasegawa M.,Tokyo Metro Co.
Japanese Railway Engineering | Year: 2014

Tokyo Metro Co., Ltd. (Tokyo Metro) and Japan International Consultants for Transportation Co., Ltd. (JIC), in conjunction with Japan International Cooperation Agency (JICA) have been awarded the "Technical Assistance Project to Strengthen the Capacity of Regulator and to Establish Operation and Maintenance of Metropolitan Railway Lines in Hanoi City." Subsequently, Tokyo Metro entered into an agreement with JICA on February 25, 2013. Although Tokyo Metro has had experience dispatching employees overseas, this project is the first time for it to engage in a full-fledged overseas assistance project.


Kamiya H.,Tokyo Metro Co. | Kawarai T.,Tokyo Metro Co.
Japanese Railway Engineering | Year: 2016

For its 10th anniversary, Tokyo Metro Co., Ltd. (Tokyo Metro) disclosed data about the locations of trains on all of its lines and about train delays. It was the first Japanese railway operator to disclose such data as open data. In addition, Tokyo Metro held the "Open Data Application Contest," a competition for apps that use the corresponding open data. A very high number of apps were submitted in the contest, and many were evaluated highly. As a result, Tokyo Metro decided to continue disclosing the data even after the contest ended. In this paper, we will report the details of the open data related to train locations and delays.


Nakajima M.,Tokyo Metro Co.
Japanese Railway Engineering | Year: 2010

In 1996 when the Tokyo Metro Co., Ltd. established the Integrated Control Center to integrate the operation of various subway lines, it put into place the "Rolling Stock Dispatcher" to support car assignment, schedule recovery, etc. At the same time, it also launched the "Rolling Stock Information Management System" to facilitate the sharing of information with car depots. Due to the opening of the Fukutoshin line and the need for replacing obsolete systems, the abovementioned systems were slated for upgrade. Further improvements to the safety and reliability of train transport were selected as themes for adopting new systems. In this backdrop, the following system is being developed. This article introduces a automatic scheduling system for rolling stock, which is a major function supporting "safe transport," one of the themes.


Among Tokyo Metro's approximately 200km of subway lines, the Tozai Line that connects Chiba Prefecture and mid-Tokyo experiences congestion of up to 199% at worst and relief of this has become urgent. Therefore, as it is imperative to increase the number of trains operating in the exceptionally congested area from mid-Tokyo going east, a large-scale renovation work is planned between lidabashi Station and Kudanshita Station that will facilitate turn-back via 3 tracks. While ensuring the safe and stable operation responsible for about 1.35 million passengers daily, this highly difficult work of inner wall demolition and reinforcement of the side walls and floor slabs will only be implemented for 3 hours during late night. This paper discusses large-scale plans to improve turn-back facilities, and the methods of construction therein as an example of operational improvement of a subway network.


Enokidani Y.,Tokyo Metro Co.
Japanese Railway Engineering | Year: 2016

The development of information and communications technology (ICT) has made it possible to process massive amounts of data in a short time. Tokyo Metro Co., Ltd. ("Tokyo Metro") uses and will continue to use ICT to improve the quality and efficiency of maintenance work, and of tunnel inspections in particular. This report introduces the application of ICT in Tokyo Metro s subway maintenance.


Shimizu Y.,Tokyo Metro Co. | Hashimoto J.-I.,Tokyo Metro Co. | Sagami K.,Tokyo Metro Co.
Japanese Railway Engineering | Year: 2016

To explore new possibilities, Tokyo Metro Co., Ltd has been working on various new technologies with a view towards practical use. From among these technologies, we would explain the "Stationary energy storage system" (SESS)," Station auxiliary power supply unit, and "Geothermal heat pump system" as facilities that could contribute to the reduction of environmental load.

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