1. Report on 3-Year Plan for Improving Safety
  2. List of activities
  3. vol.03 Bridge maintenance inspection technology training facility N2U-BRIDGE at Nagoya University campus

Efforts in the 3-Year Plan for Improving Safety

Human resource development through practical training

NEXCO CENTRAL is promoting human resource development including systematic safety education based on the “3-Year Plan for Improving Safety”. As part of this, we are working to enhance training facilities that enable hands-on experience and education.
"N2U-BRIDGE" (New Bridge) using actual bridges that have been used for many years. And "E-MAC" which reproduced the Expressway indoors. These two training facilities will improve the knowledge and technical skills of employees.

Bridge maintenance inspection technology training facility N2U-BRIDGE (New Bridge)

"New Bridge" is a training facility jointly established by Nagoya University and NEXCO CENTRAL and Central Japan Highway Engineering Nagoya Co., Ltd. on the premises of Nagoya University. In order to maintain the safety and comfort of infrastructure such as bridges, we are developing human resources with advanced skills to perform appropriate inspection, diagnosis and evaluation. Here, we are rebuilding facilities using bridge materials that have been used for many years, and we have installed various degraded samples. You can learn more practically the changes that have appeared over time.

Reduce the number of annual construction regulations (estimated)
  • Former Shibuegawa Bridge (Nanto City, Toyama Prefecture)
    Service years: 35 years

    It is a steel plate girder bridge that was bridged on the Hokuriku Expwy. You can observe floor slab cracks and concrete deterioration caused by fatigue deterioration over many years.

  • Former Nichimatsu Bridge (Komatsu City, Ishikawa Prefecture)
    Service years: 37 years

    It was a prestressed concrete hollow slab bridge that was bridged as an overpass for the Hokuriku Expwy. In addition to observing cracks in concrete, you can also learn the internal conditions through slice-cut sections.

  • Former Kotogawa Bridge (Ube City, Yamaguchi Prefecture)
    Service years: 74 years

    Reinforced concrete T girder bridge that was bridged over National Route 190. In addition to corrosion of steel due to salt damage accumulated over many years, deformation due to carbonation of concrete can be seen. In addition, re-degradation of the repaired part can be observed.

  • Former Nishibiwajima Pedestrian Bridge (Kiyosu City, Aichi Prefecture)
    Service years: 51 years

    This is the first pedestrian bridge in Japan. You can see the rust of the bridge girder and the concrete deterioration of the floor slab due to the service life of 51 years.

Hikaru Nakamura, Nagoya University Graduate School of Engineering, Department of Social Infrastructure Engineering, Bridge Life Extension Promotion Office

Many bridges constructed during the period of high growth are aging, and the number will increase rapidly in the future. Proper maintenance of existing bridges is becoming increasingly important. For this reason, there is an urgent need to develop human resources who have basic knowledge of bridge design and construction according to the age of construction, and who can accurately inspect, diagnose, and evaluate various degradation events.
I hope this new bridge will help improve the safety of not only Expressway but also aging structures.

Main training content

■ Cavity exploration
Hammering inspection with a hammer is sound and vibration, and infrared thermography searches for voids, cracks, and delaminations in concrete due to differences in surface temperature.
■ Rebar search
Confirm the depth and position of the reinforcing steel in the concrete using electromagnetic induction.
Rebar exploration
■ Fatigue crack detection of steel
Steel joints are inspected for small invisible surface flaws using eddy current testing.
Exploration of fatigue cracks in steel
■ By crack gauge
Crack width measurement

In the visual inspection, crack gauges are used to measure the width of cracks generated in the concrete to determine the state of deterioration and the possibility of repair.
Crack width measurement by crack gauge
■ Concrete
Estimated intensity measurement

Check the strength of the concrete by hitting the surface of the concrete and using a rebound hammer to measure the strength from the degree of rebound.
Estimated strength measurement of concrete
■ Measurement of paint thickness of steel bridge
The coating used to prevent corrosion of steel materials may become thinner over time, so use a coating film meter to check whether the coating thickness has changed.
Steel bridge coating thickness measurement
■ Inspection of invisible parts
The places that are difficult to see are photographed using an inspection camera attached to the tip of the pole to check for deformation.
Inspection of invisible parts
■ Neutralization depth measurement
When concrete is neutralized by carbon dioxide, the internal rebar is easily corroded, so the depth of neutralization is measured.
Neutralization depth measurement
Basic Course Program (2 days) Form
First day Current status of bridges in Japan
Outline of bridge structure ・ Flow of bridge maintenance ・
Inspection method and principle of non-destructive inspection equipment
the 2nd day Explanation of deterioration status of New Bridge
Inspection equipment measurement training
New Bridge Practice
Inspection course program (3 days) Form
First day Overview of the current status of Japanese bridges, changes in standards, and changes
Estimation of deterioration mechanism (concrete members)
Explanation of deterioration status of New Bridge New Bridge Practice
the 2nd day Estimation of deterioration mechanism (steel members)
Inspection techniques (non-destructive testing), Ministry of Land, Infrastructure, Transport and Tourism periodic inspection procedures -
Explanation of record, inspection procedures of each organization, points of interest for inspection
Third day Case study (damage diagram creation / damage judgment / estimation of deterioration mechanism)
Inspection equipment measurement training
New Bridge Practice
“New Bridge” not only provides in-house training for the NEXCO CENTRAL Group, but also provides training and education for bridge maintenance engineers such as government agencies and private companies.

Learn more about New BridgeRecommended Nagoya University / NEXCO CENTRAL Bridge Model N2U-BRIDGE


"E-MAC" was established in Kakamigahara City, Gifu Prefecture, for the purpose of "acquisition of failure repair technology" for machinery and equipment, "acquisition of civil engineering technology", and "to acquire a safety culture". Was. In the facility, electric facilities and tunnel emergency facilities used on the Expressway are installed, and the equipment used at the actual site is used to learn the work involved in inspections and function stoppages, and inspection and repair technologies Is being improved.
In addition, as part of our efforts to protect the environment and disasters, the center secures wells that can be used for drinking water, maintains private power generation facilities, stocks up disaster prevention products and prepares cooking facilities, etc. Will contribute as. In addition, we are taking care of the environment by collecting rainwater and sprinkling water on green spaces.

Reduce the number of annual construction regulations (estimated)

Kenji Nakajima Director, E-MAC Technical Training Center

We have been responsible for the maintenance and management of Expressway facilities since the opening of the Meishin Expwy. However, in recent years, failures have been reduced due to the sophistication and integration of facilities, and opportunities for gaining on-site experience have been reduced. Therefore, the “E-MAC Technical Training Center” was established with the aim of providing practical training that is more tailored to the field. Here, we will improve the skills of maintenance inspection technology and failure repair technology by reusing old equipment. In addition, we aim to improve our ability to respond by creating events such as breakdowns, and to raise awareness of safety by experiencing dangers with ourselves. From skilled technicians to younger generations. We will continue to pass on technology for safety.

Location 7-71-10 Unakamakaharacho, Kakamigahara City, Gifu Prefecture

Main training content

■ Measurement training using a water spray measurement vehicle
Training to measure the water level of the water spray equipment using a measuring vehicle.
■ Measurement training with water spray equipment inspection car
Training to measure the amount of water discharged from the water spray equipment, one of the tunnel emergency equipment, using a water spray equipment inspection vehicle.
■ Rope access
Learn while actually experiencing rope access technology, one of the inspection work at high places on the Expressway.
■ Rope access
You will learn while actually experiencing rope access, one of the techniques required for Expressway inspections.
■ Inspection of tunnel lighting equipment
In a tunnel reproduced indoors, you will experience inspection, cleaning, and structural inspection of lighting equipment using an aerial work vehicle.
Tunnel lighting equipment inspection
■ Operation training for road information boards
Using road information boards that were actually used on Expressway, learn basic inspection work and restoration work in case of breakdown.
Operation training for road information boards, etc.
■ Incoming power distribution / in-house power generation equipment inspection
Experience inspection and restoration work at facilities that supply power and respond to power outages. By using the same equipment installed at the site, you will learn how to respond to the site.
Power distribution / in-house power generation equipment inspection
■ Scaffolding and safety confirmation
Reproduce the scaffolding required for Expressway construction, inspection and repair. Go up and check the safety technology of the work you do there.
Scaffolding and safety confirmation
■ Experience field
You will learn how to notice dangers by projecting images of the Expressway a large screen, waiting for traffic to pass, and collecting falling objects across the Expressway.
Foster a safety culture

Facility staff interview

Lecturer at NEXCO CENTRAL Training Facility
We talk about training to maintain safety.

Yuzo Kato Chief, Technical Training Center, Ability & Human Resources Development Department, Central Japan Highway Engineering Nagoya Co., Ltd.
Click here for interview contents