2019 JICA Group and Region Focused Training in Road Maintenance and Management (C)

2019年度 JICA課題別研修:道路維持管理(C)コース





We held Final Evaluation Meeting, convened by Road Maintenance © course participants and JICA officer, starting at 10:00am.  Based on the answers in JICA questionnaire submitted a week ago, each participant was asked to speak on his/her impression and thought on this program.  In general, they seemed satisfied with the training (lecture, site visit, mainland program, OIC life, etc.).  This event was followed by Closing Ceremony at 11:15am held in a room on 1st floor, in which all participants received a certificate.  Then, all concerted staff and participants joined the Farewell Party.




This was the day of summary report presentation.  Each participant produced a report in which they summarized what they have learnt and what can be utilized to solve issues in their countries.  Thirty minutes was allocated to each participant which included 15 minutes of presentation and 15 minutes of Q and A.  Invited commentators were Prof. Yabuki (University of the Ryukyus), Mr. Shimoji (Okinawa General Bureau), Mr. Maemura (Okinawa Prefectural Government), and Mr. Matsuda (Shimatate Association).  They have asked questions to the presenter and provided advices.  There were questions raised from participant side as well.  In order to find solutions to the challenges faced, participants had many advices and discussion toward positive direction.  We all look forward to see the issues to be addressed.



The morning lecture was the last lecture.  The theme of the lecture was “Road Landscape in Okinawa”, delivered by Mr. Kohagura, Technical Advisor at Asahi Construction Consultant.  In the first half of his talk, he showed pictures of   the typical road from the country of each participant (retrieved from Google Map) and we discussed various viewpoints of road landscape.  Though there are differences, we observed the consideration for landscape in these examples.  In the later half, we explained the purpose, roles, and usage of Okinawa Prefectural Landscape Evaluation Guideline.  He introduced different kind of viewing points.  After briefing on basic content of landscape checklist, he expounded key points of landscaping by showing actual examples from Okinawa.



We visited Nanawa Co. Ltd., an asphalt plant, in the morning.  Mr. Kishimoto explained asphalt production flow using their plant chart. Then we observed the interior of the plant including stockyard, cold hopper, mixer and loading onto dump truck at loading gate, escorted by Mr. Yamazaki, Vice Director of the plant. 

In the afternoon, participants did an exercise of material testing in the plant.  Using asphalt material shipped out of the factory, we experienced the actual check of mix, temperature measurement, labeling with rake, and compaction.  At the end, we checked the finished surface condition.  Participants assessed the evenness, fineness, and cracks by themselves.



Morning presentation was given by Prof. Aydan, School of Engineering, University of the Ryukyus on geotechnology, and he showed the research equipment in natural disaster simulation laboratory of “Disaster Prevention Research Center for Island Regions”.  Participants were amazed to see advanced equipment such as tsunami simulation device.

In the afternoon, we had lectures given by Prof. Shimozato and his laboratory staff.  After the lecture, they showed us exposure experiment field, and laboratory facilities.  Participants observed with high interest the progress of corrosion in steel members and bolt cap, etc., taking pictures and videos.



Mr. Shinoda, President of japan Concrete Technology Co. Ltd. presented a lecture on “Corrosion-induced Damage due to Salt Attack and Durability of Concrete Structure” this morning.  Participants asked many questions about the mechanism of salt attack and concrete pavement. 

In the afternoon, we had a lecture given by Mr. Morita, KF Chemical Co. Ltd, on “Asphalt Pavement Maintenance Technology”.  Questions were raised one after another about rutting of pavement, kinds of pavement and method of finishing, etc.



In the morning, we attended a lecture by Mr. Moriyasu Furuki, Advisor to International Construction Technology Association on “Pavement Design and Damages”.  We learned importance of quality control at asphalt plant, and the design method of appropriate paved road suited to the given traffic demand.  He introduced successful cases of pavement repair JICA project and those failed. 

The afternoon lecture was given by Prof. Makoto Kimura from Kyoto University on “How to Maintain the Rural Road by Ourselves”.  He introduced activities of NGO, headed by himself, mainly in Africa, and other cases from other countries.  He emphasized the effectiveness of use of “Donou” for unpaved roads in rural area.  He explained the importance of road among infrastructures using video.  During his lecture, participants were so attracted to his persuasive and humorous talk.



We visited Okinawa Prefectural Construction Technology Center this morning.  We first had a lecture on “Recycled Construction Materials” presented by Mr. Akira Tamaki.  He introduced Okinawa’s certification system of Yuikuru Materials (recycled materials).  Then Mr. Yasutoshi Arashiro explained about testing of paving materials how test is conducted. They showed their laboratory and facilities for tests.

In the afternoon, Mr. Akihiro Nishikawa gave a lecture on “Tunnel Management”, and shared his experiences with mountain tunnels.  He expounded on the design, construction method of tunneling with using photos and videos.



We spent a whole day for observing major rods and downtown streets of Tokyo.  We went up to the observatory of Tokyo Sky Tree to study well-organized road network and landscape of Tokyo.  The beautiful weather helped us see arterial roads and even Tokyo Metropolitan Government Office in distance but not Mt. Fuji unfortunately. 

  Then we moved to Asakusa with chartered bus, and enjoyed own time walking down the historical old street.  All was surprised with a large crowd of people including international visitors at the temple area.  It so happened that two participants had on-camera interview by NHK Television.  In the evening, we flew back to Naha and arrived around 7pm, a little behind the scheduled time. 



We observed research facilities in Public Works Research Institute (PWRI) and National Institute for Land and Infrastructure Management (NILIM) in the morning.  We first experienced running on test run field with our bus and pavement test field where it is inclined by 28 degrees.  Then we were shown experimental equipment of structures and dismantled bridge members stored for research purposes.  We saw sample beams taken from a collapsed bridge in Okinawa.

In the afternoon, we had lectures presented by Mr. Fujita, senior researcher of Bridge and Structures Division, NILIM titled “Panning of Highway Bridges “, and Dr. Kawakami, senior researcher of Pavement Research Team, PWRI, on “Pavement Technologies and Management in Japan “



We attended a lecture delivered by Prof. Horita on “Bidding and Contract System in Japan” at Kashiwanoha Campus of University of Tokyo in the morning.  At the beginning of his lecture, he introduced history of civil engineering system of Japan since Edo era to date.  Then he expounded on the system and issues in structure maintenance, and on bidding and contract system for maintenance works.  The class had active discussions on current issues faced in Japan and their countries.  At the end, pavement management for conservation was introduced.

After lunch, Ms. Kikuchi, a student of the university, showed us around the campus facilities including Institute of Industrial Science and Prof. Kajita (a Nobel prize winner) laboratory.



In the morning, Mr. Ueho, director general of construction technology at Toyama City Office, delivered a lecture on “Bridge Management” at Canal Hall of Toyama City.  He elaborated on various risks affecting bridge and administrative issues.  We discussed not only importance of road maintenance but also the roles and principles of future construction engineers. 

In the afternoon, we visited Nakajima Lock to study its historical role and structure and observed how water level was adjusted so pleasure boat can cruise through this channel.  Then we observed two bridges under replacement work including Oshima Bridge and road construction work to connect tram lines of north and south of Toyama Station.  We used a minibus owned by the city office and trams as means of transportation.  After the observation, we moved to Tokyo by Hokuriku Shinkansen that restarted the operation after a suspension due to the typhoon damage.



This is a week of study tour in the mainland Japan.  We took an express train, “Thunderbird”, to move from Kyoto to Fukui to observe a site near Fukui Station where railway for Hokuriku Shinkansen (super express “bullet” train) was under construction.  It was a massive project covering an extensive length between Fukui Station to Asua River and employing multiple construction methods.  The foundation had already been constructed.  Mr. Horita, Group Director, and Mr. Masuda, Director of branch office briefed us the overview of the project and explained construction methods, and escorted us to the site.  Participants saw a work of cantilever bridge being prepared and were inquisitively asking questions about method of foundation works.  In the evening, we moved to Toyama after transferring train to Shinkansen.  The engineers of Toyama City Office welcomed us to dinner at a local restaurant.



Morning lecture was delivered by Mr. Fukuda, a consultant for Ichikawa City Hall, on “Safety and Health Management in Japan”.  He explained that Constitution of Japan and Labor Standards Act are the legislations which ensure occupational safety, and introduced Industrial Safety and Health Act, its purpose and what it demands, as this law is the principle of safety and health measures.  He showed some pictures of bad examples of construction sites to elucidate the importance of tidiness.

In the afternoon, Mr. Mita of Choju Hokyodo Co. Ltd. presented a lecture on “Slope Management”.  He explained that there is a long-run risk in current method of slope management by showing actual examples.  He then introduced new devices and techniques and their use in slope reinforcement measures which contribute to extend the life of structure.  Participants were carefully listening to his analysis of new technology.



We spent a whole day for site visits, including 2 national road maintenance sites (shrub trimming/weeding work of route 58 in Urasoe and drain cleaning of Ginowan bypass line) in the morning and 2 construction sites of the structures ordered by Okinawa prefectural government in the afternoon.  In the morning, participants showed keen interest and asked questions about the equipment in use such as grass cutter and vacuum cleaner.

The first site in the afternoon was Seikai Bridge of Kaichu Road where the bridge pier reinforcement work to meet requirement of anti-seismic standard was ongoing.  We were able to see Epoxy resin coated rebars arranged around the pier.  The second site was the erection of bridge girder at Southern East Road.  It was a rare chance that we saw the drawing out of the girders.



Professor Yabuki, Emeritus Professor from University of the Ryukyus delivered a lecture on “Bridge Maintenance Engineering” in the morning.  He stated that salt damage is the most essential risk factor for infrastructures in Okinawa, and expounded in detail on the present status and countermeasures by showing actual incidents of bridges.

In the afternoon, Mr. Koguchi, CIC Manager of Maeda Construction Co. Ltd. Discussed on “Environment Conservation Technology for Road Maintenance”.  He explained legal systems for environment in Japan at first.  Then he introduced environmental conservation measures taken at the construction sites.  In regards to compliance to environmental laws, class discussion was heated especially because the managerial system of Japan is based on innate goodness of man.



We had a lecture given by the officers from Road Management Division, Department of Civil Engineering and Construction, Okinawa Prefectural Government, on “Road Maintenance by Okinawa Prefectural Government”.  They explained how and what kinds of road maintenance activities are carried out.  Participants asked many questions about regulatory systems and selection of contractors.

Afternoon lecture was on “Drone and 3D-CAD” presented by Mr. Suzuki, Director of Strategy Section of Okabe Maintenance Co. Ltd.  First half of his lecture covered drone aerial photography and procedure of 3D image generation.  In the later half, he explained procedure of modeling in SketchUp.  He made it easy for participants to understand      by showing examples.  Participants asked many questions as they would try to draw modeling with this technique in their own time.



Mr. Kamiya from Administration Division, Department of Civil Engineering and Construction, Okinawa Prefectural Government gave a brief introduction of construction techniques developed in Okinawa including techniques of preventing red silt runoff, countermeasures against salt injury, and prevention of slope collapse in a half an hour. Participants were listening carefully to his discussion. 

Then, we had presentation (prepared in PowerPoint) session of inception reports.  Participants presented about the country profile, touristic resources, and current situation of roads in their countries.  It was clear that they face issues on availability of machineries and technical experts.  One common obstacle for future development was “securing sufficient budget”. 



Morning lecture was presented by Mr.Nakazono, Disaster Prevention Section, Department of Development and Construction, Okinawa General Bureau on “Road Disaster Prevention Measures”.  He used actual example of Typhoon no. 19 to explain how national government responds at the time of disaster.  At the end, he briefed on disaster response activities of Okinawa General Bureau, and answered to a lot of questions. 

In the afternoon, Mr. Kina (Chief of Planning and Coordination Section), Road and Street Construction Division, Civil engineering and Construction Department, Okinawa Prefectural Government gave a lecture on “History of Road Maintenance in Okinawa, Future Road Plan”.  He first showed a video, “Story of Roads in Okinawa” so that the participants would learn Okinawa’s postwar history.  Then he explained details of road construction after the war and the reversion of Okinawa.  At the end, he explained the future road plan.  There are many questions about the environment conservation, etc.



Morning lecture was on “Operating and Maintaining of National Highways” delivered by Mr. Shimoji, Manager of Department of Development and Construction, Okinawa General Bureau.  In his lecture, he covered how daily maintenance and disaster response activities are carried out.  At the end, he spoked about the duties of Okinawa General Bureau.  Then he answered to many questions that are raised.

In the afternoon, we visited two sites where national government has ordered maintenance and reinforcement works.  First site was at Izumizaki intersection where pedestrian bridge was under repair work.  Participants asked questions about how actually the repair being done.  The second site was at Haebaru elevated bridge where bridge pier was under anti-seismic reinforcement work.  Participants were keenly observed the work process.



We had a lecture given by Prof. Yabuki, Emeritus Professor of University of the Ryukyus, on “Basic Concept on Infrastructures” in the morning. He showed actual examples from Okinawa (Irabu Great Bridge) and Sky Tree in Tokyo and discussed the significance of infrastructure of different perspectives. Participants asked questions actively and had a discussion at the end.

In the afternoon, Mr. Wada, Planning Coordination Officer from Development and Construction Department, Okinawa General Bureau, delivered a lecture on “Road Network of Japan and Okinawa”. All participants had keen interest in this topic and asked many questions.

In the evening, we joined a welcome party at a restaurant in Naha City with the lecturers of our program which included those from National Government, Prefectural Government, University and private companies. We enjoyed this lovely occasion with drinks (Orion Beer, wine, and Awamori, local liquor.